drivers/char/synclinkmp.c

   1 /*
   2  * $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $
   3  *
   4  * Device driver for Microgate SyncLink Multiport
   5  * high speed multiprotocol serial adapter.
   6  *
   7  * written by Paul Fulghum for Microgate Corporation
   8  * paulkf@microgate.com
   9  *
  10  * Microgate and SyncLink are trademarks of Microgate Corporation
  11  *
  12  * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
  13  * This code is released under the GNU General Public License (GPL)
  14  *
  15  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  16  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  19  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  23  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  24  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  25  * OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
  29 #if defined(__i386__)
  30 #  define BREAKPOINT() asm("   int $3");
  31 #else
  32 #  define BREAKPOINT() { }
  33 #endif
  34
  35 #define MAX_DEVICES 12
  36
  37 #include <linux/config.h>
  38 #include <linux/module.h>
  39 #include <linux/errno.h>
  40 #include <linux/signal.h>
  41 #include <linux/sched.h>
  42 #include <linux/timer.h>
  43 #include <linux/interrupt.h>
  44 #include <linux/pci.h>
  45 #include <linux/tty.h>
  46 #include <linux/tty_flip.h>
  47 #include <linux/serial.h>
  48 #include <linux/major.h>
  49 #include <linux/string.h>
  50 #include <linux/fcntl.h>
  51 #include <linux/ptrace.h>
  52 #include <linux/ioport.h>
  53 #include <linux/mm.h>
  54 #include <linux/slab.h>
  55 #include <linux/netdevice.h>
  56 #include <linux/vmalloc.h>
  57 #include <linux/init.h>
  58 #include <linux/delay.h>
  59 #include <linux/ioctl.h>
  60
  61 #include <asm/system.h>
  62 #include <asm/io.h>
  63 #include <asm/irq.h>
  64 #include <asm/dma.h>
  65 #include <linux/bitops.h>
  66 #include <asm/types.h>
  67 #include <linux/termios.h>
  68 #include <linux/workqueue.h>
  69 #include <linux/hdlc.h>
  70
  71 #ifdef CONFIG_HDLC_MODULE
  72 #define CONFIG_HDLC 1
  73 #endif
  74
  75 #define GET_USER(error,value,addr) error = get_user(value,addr)
  76 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
  77 #define PUT_USER(error,value,addr) error = put_user(value,addr)
  78 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
  79
  80 #include <asm/uaccess.h>
  81
  82 #include "linux/synclink.h"
  83
  84 static MGSL_PARAMS default_params = {
  85         MGSL_MODE_HDLC,                 /* unsigned long mode */
  86         0,                              /* unsigned char loopback; */
  87         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
  88         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
  89         0,                              /* unsigned long clock_speed; */
  90         0xff,                           /* unsigned char addr_filter; */
  91         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
  92         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
  93         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
  94         9600,                           /* unsigned long data_rate; */
  95         8,                              /* unsigned char data_bits; */
  96         1,                              /* unsigned char stop_bits; */
  97         ASYNC_PARITY_NONE               /* unsigned char parity; */
  98 };
  99
 100 /* size in bytes of DMA data buffers */
 101 #define SCABUFSIZE      1024
 102 #define SCA_MEM_SIZE    0x40000
 103 #define SCA_BASE_SIZE   512
 104 #define SCA_REG_SIZE    16
 105 #define SCA_MAX_PORTS   4
 106 #define SCAMAXDESC      128
 107
 108 #define BUFFERLISTSIZE  4096
 109
 110 /* SCA-I style DMA buffer descriptor */
 111 typedef struct _SCADESC
 112 {
 113         u16     next;           /* lower l6 bits of next descriptor addr */
 114         u16     buf_ptr;        /* lower 16 bits of buffer addr */
 115         u8      buf_base;       /* upper 8 bits of buffer addr */
 116         u8      pad1;
 117         u16     length;         /* length of buffer */
 118         u8      status;         /* status of buffer */
 119         u8      pad2;
 120 } SCADESC, *PSCADESC;
 121
 122 typedef struct _SCADESC_EX
 123 {
 124         /* device driver bookkeeping section */
 125         char    *virt_addr;     /* virtual address of data buffer */
 126         u16     phys_entry;     /* lower 16-bits of physical address of this descriptor */
 127 } SCADESC_EX, *PSCADESC_EX;
 128
 129 /* The queue of BH actions to be performed */
 130
 131 #define BH_RECEIVE  1
 132 #define BH_TRANSMIT 2
 133 #define BH_STATUS   4
 134
 135 #define IO_PIN_SHUTDOWN_LIMIT 100
 136
 137 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 138
 139 struct  _input_signal_events {
 140         int     ri_up;
 141         int     ri_down;
 142         int     dsr_up;
 143         int     dsr_down;
 144         int     dcd_up;
 145         int     dcd_down;
 146         int     cts_up;
 147         int     cts_down;
 148 };
 149
 150 /*
 151  * Device instance data structure
 152  */
 153 typedef struct _synclinkmp_info {
 154         void *if_ptr;                           /* General purpose pointer (used by SPPP) */
 155         int                     magic;
 156         int                     flags;
 157         int                     count;          /* count of opens */
 158         int                     line;
 159         unsigned short          close_delay;
 160         unsigned short          closing_wait;   /* time to wait before closing */
 161
 162         struct mgsl_icount      icount;
 163
 164         struct tty_struct       *tty;
 165         int                     timeout;
 166         int                     x_char;         /* xon/xoff character */
 167         int                     blocked_open;   /* # of blocked opens */
 168         u16                     read_status_mask1;  /* break detection (SR1 indications) */
 169         u16                     read_status_mask2;  /* parity/framing/overun (SR2 indications) */
 170         unsigned char           ignore_status_mask1;  /* break detection (SR1 indications) */
 171         unsigned char           ignore_status_mask2;  /* parity/framing/overun (SR2 indications) */
 172         unsigned char           *tx_buf;
 173         int                     tx_put;
 174         int                     tx_get;
 175         int                     tx_count;
 176
 177         wait_queue_head_t       open_wait;
 178         wait_queue_head_t       close_wait;
 179
 180         wait_queue_head_t       status_event_wait_q;
 181         wait_queue_head_t       event_wait_q;
 182         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
 183         struct _synclinkmp_info *next_device;   /* device list link */
 184         struct timer_list       status_timer;   /* input signal status check timer */
 185
 186         spinlock_t lock;                /* spinlock for synchronizing with ISR */
 187         struct work_struct task;                        /* task structure for scheduling bh */
 188
 189         u32 max_frame_size;                     /* as set by device config */
 190
 191         u32 pending_bh;
 192
 193         int bh_running;                         /* Protection from multiple */
 194         int isr_overflow;
 195         int bh_requested;
 196
 197         int dcd_chkcount;                       /* check counts to prevent */
 198         int cts_chkcount;                       /* too many IRQs if a signal */
 199         int dsr_chkcount;                       /* is floating */
 200         int ri_chkcount;
 201
 202         char *buffer_list;                      /* virtual address of Rx & Tx buffer lists */
 203         unsigned long buffer_list_phys;
 204
 205         unsigned int rx_buf_count;              /* count of total allocated Rx buffers */
 206         SCADESC *rx_buf_list;                   /* list of receive buffer entries */
 207         SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
 208         unsigned int current_rx_buf;
 209
 210         unsigned int tx_buf_count;              /* count of total allocated Tx buffers */
 211         SCADESC *tx_buf_list;           /* list of transmit buffer entries */
 212         SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
 213         unsigned int last_tx_buf;
 214
 215         unsigned char *tmp_rx_buf;
 216         unsigned int tmp_rx_buf_count;
 217
 218         int rx_enabled;
 219         int rx_overflow;
 220
 221         int tx_enabled;
 222         int tx_active;
 223         u32 idle_mode;
 224
 225         unsigned char ie0_value;
 226         unsigned char ie1_value;
 227         unsigned char ie2_value;
 228         unsigned char ctrlreg_value;
 229         unsigned char old_signals;
 230
 231         char device_name[25];                   /* device instance name */
 232
 233         int port_count;
 234         int adapter_num;
 235         int port_num;
 236
 237         struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
 238
 239         unsigned int bus_type;                  /* expansion bus type (ISA,EISA,PCI) */
 240
 241         unsigned int irq_level;                 /* interrupt level */
 242         unsigned long irq_flags;
 243         int irq_requested;                      /* nonzero if IRQ requested */
 244
 245         MGSL_PARAMS params;                     /* communications parameters */
 246
 247         unsigned char serial_signals;           /* current serial signal states */
 248
 249         int irq_occurred;                       /* for diagnostics use */
 250         unsigned int init_error;                /* Initialization startup error */
 251
 252         u32 last_mem_alloc;
 253         unsigned char* memory_base;             /* shared memory address (PCI only) */
 254         u32 phys_memory_base;
 255         int shared_mem_requested;
 256
 257         unsigned char* sca_base;                /* HD64570 SCA Memory address */
 258         u32 phys_sca_base;
 259         u32 sca_offset;
 260         int sca_base_requested;
 261
 262         unsigned char* lcr_base;                /* local config registers (PCI only) */
 263         u32 phys_lcr_base;
 264         u32 lcr_offset;
 265         int lcr_mem_requested;
 266
 267         unsigned char* statctrl_base;           /* status/control register memory */
 268         u32 phys_statctrl_base;
 269         u32 statctrl_offset;
 270         int sca_statctrl_requested;
 271
 272         u32 misc_ctrl_value;
 273         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
 274         char char_buf[MAX_ASYNC_BUFFER_SIZE];
 275         BOOLEAN drop_rts_on_tx_done;
 276
 277         struct  _input_signal_events    input_signal_events;
 278
 279         /* SPPP/Cisco HDLC device parts */
 280         int netcount;
 281         int dosyncppp;
 282         spinlock_t netlock;
 283
 284 #ifdef CONFIG_HDLC
 285         struct net_device *netdev;
 286 #endif
 287
 288 } SLMP_INFO;
 289
 290 #define MGSL_MAGIC 0x5401
 291
 292 /*
 293  * define serial signal status change macros
 294  */
 295 #define MISCSTATUS_DCD_LATCHED  (SerialSignal_DCD<<8)   /* indicates change in DCD */
 296 #define MISCSTATUS_RI_LATCHED   (SerialSignal_RI<<8)    /* indicates change in RI */
 297 #define MISCSTATUS_CTS_LATCHED  (SerialSignal_CTS<<8)   /* indicates change in CTS */
 298 #define MISCSTATUS_DSR_LATCHED  (SerialSignal_DSR<<8)   /* change in DSR */
 299
 300 /* Common Register macros */
 301 #define LPR     0x00
 302 #define PABR0   0x02
 303 #define PABR1   0x03
 304 #define WCRL    0x04
 305 #define WCRM    0x05
 306 #define WCRH    0x06
 307 #define DPCR    0x08
 308 #define DMER    0x09
 309 #define ISR0    0x10
 310 #define ISR1    0x11
 311 #define ISR2    0x12
 312 #define IER0    0x14
 313 #define IER1    0x15
 314 #define IER2    0x16
 315 #define ITCR    0x18
 316 #define INTVR   0x1a
 317 #define IMVR    0x1c
 318
 319 /* MSCI Register macros */
 320 #define TRB     0x20
 321 #define TRBL    0x20
 322 #define TRBH    0x21
 323 #define SR0     0x22
 324 #define SR1     0x23
 325 #define SR2     0x24
 326 #define SR3     0x25
 327 #define FST     0x26
 328 #define IE0     0x28
 329 #define IE1     0x29
 330 #define IE2     0x2a
 331 #define FIE     0x2b
 332 #define CMD     0x2c
 333 #define MD0     0x2e
 334 #define MD1     0x2f
 335 #define MD2     0x30
 336 #define CTL     0x31
 337 #define SA0     0x32
 338 #define SA1     0x33
 339 #define IDL     0x34
 340 #define TMC     0x35
 341 #define RXS     0x36
 342 #define TXS     0x37
 343 #define TRC0    0x38
 344 #define TRC1    0x39
 345 #define RRC     0x3a
 346 #define CST0    0x3c
 347 #define CST1    0x3d
 348
 349 /* Timer Register Macros */
 350 #define TCNT    0x60
 351 #define TCNTL   0x60
 352 #define TCNTH   0x61
 353 #define TCONR   0x62
 354 #define TCONRL  0x62
 355 #define TCONRH  0x63
 356 #define TMCS    0x64
 357 #define TEPR    0x65
 358
 359 /* DMA Controller Register macros */
 360 #define DARL    0x80
 361 #define DARH    0x81
 362 #define DARB    0x82
 363 #define BAR     0x80
 364 #define BARL    0x80
 365 #define BARH    0x81
 366 #define BARB    0x82
 367 #define SAR     0x84
 368 #define SARL    0x84
 369 #define SARH    0x85
 370 #define SARB    0x86
 371 #define CPB     0x86
 372 #define CDA     0x88
 373 #define CDAL    0x88
 374 #define CDAH    0x89
 375 #define EDA     0x8a
 376 #define EDAL    0x8a
 377 #define EDAH    0x8b
 378 #define BFL     0x8c
 379 #define BFLL    0x8c
 380 #define BFLH    0x8d
 381 #define BCR     0x8e
 382 #define BCRL    0x8e
 383 #define BCRH    0x8f
 384 #define DSR     0x90
 385 #define DMR     0x91
 386 #define FCT     0x93
 387 #define DIR     0x94
 388 #define DCMD    0x95
 389
 390 /* combine with timer or DMA register address */
 391 #define TIMER0  0x00
 392 #define TIMER1  0x08
 393 #define TIMER2  0x10
 394 #define TIMER3  0x18
 395 #define RXDMA   0x00
 396 #define TXDMA   0x20
 397
 398 /* SCA Command Codes */
 399 #define NOOP            0x00
 400 #define TXRESET         0x01
 401 #define TXENABLE        0x02
 402 #define TXDISABLE       0x03
 403 #define TXCRCINIT       0x04
 404 #define TXCRCEXCL       0x05
 405 #define TXEOM           0x06
 406 #define TXABORT         0x07
 407 #define MPON            0x08
 408 #define TXBUFCLR        0x09
 409 #define RXRESET         0x11
 410 #define RXENABLE        0x12
 411 #define RXDISABLE       0x13
 412 #define RXCRCINIT       0x14
 413 #define RXREJECT        0x15
 414 #define SEARCHMP        0x16
 415 #define RXCRCEXCL       0x17
 416 #define RXCRCCALC       0x18
 417 #define CHRESET         0x21
 418 #define HUNT            0x31
 419
 420 /* DMA command codes */
 421 #define SWABORT         0x01
 422 #define FEICLEAR        0x02
 423
 424 /* IE0 */
 425 #define TXINTE          BIT7
 426 #define RXINTE          BIT6
 427 #define TXRDYE          BIT1
 428 #define RXRDYE          BIT0
 429
 430 /* IE1 & SR1 */
 431 #define UDRN    BIT7
 432 #define IDLE    BIT6
 433 #define SYNCD   BIT4
 434 #define FLGD    BIT4
 435 #define CCTS    BIT3
 436 #define CDCD    BIT2
 437 #define BRKD    BIT1
 438 #define ABTD    BIT1
 439 #define GAPD    BIT1
 440 #define BRKE    BIT0
 441 #define IDLD    BIT0
 442
 443 /* IE2 & SR2 */
 444 #define EOM     BIT7
 445 #define PMP     BIT6
 446 #define SHRT    BIT6
 447 #define PE      BIT5
 448 #define ABT     BIT5
 449 #define FRME    BIT4
 450 #define RBIT    BIT4
 451 #define OVRN    BIT3
 452 #define CRCE    BIT2
 453
 454
 455 /*
 456  * Global linked list of SyncLink devices
 457  */
 458 static SLMP_INFO *synclinkmp_device_list = NULL;
 459 static int synclinkmp_adapter_count = -1;
 460 static int synclinkmp_device_count = 0;
 461
 462 /*
 463  * Set this param to non-zero to load eax with the
 464  * .text section address and breakpoint on module load.
 465  * This is useful for use with gdb and add-symbol-file command.
 466  */
 467 static int break_on_load=0;
 468
 469 /*
 470  * Driver major number, defaults to zero to get auto
 471  * assigned major number. May be forced as module parameter.
 472  */
 473 static int ttymajor=0;
 474
 475 /*
 476  * Array of user specified options for ISA adapters.
 477  */
 478 static int debug_level = 0;
 479 static int maxframe[MAX_DEVICES] = {0,};
 480 static int dosyncppp[MAX_DEVICES] = {0,};
 481
 482 module_param(break_on_load, bool, 0);
 483 module_param(ttymajor, int, 0);
 484 module_param(debug_level, int, 0);
 485 module_param_array(maxframe, int, NULL, 0);
 486 module_param_array(dosyncppp, int, NULL, 0);
 487
 488 static char *driver_name = "SyncLink MultiPort driver";
 489 static char *driver_version = "$Revision: 4.38 $";
 490
 491 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
 492 static void synclinkmp_remove_one(struct pci_dev *dev);
 493
 494 static struct pci_device_id synclinkmp_pci_tbl[] = {
 495         { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
 496         { 0, }, /* terminate list */
 497 };
 498 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
 499
 500 MODULE_LICENSE("GPL");
 501
 502 static struct pci_driver synclinkmp_pci_driver = {
 503         .owner          = THIS_MODULE,
 504         .name           = "synclinkmp",
 505         .id_table       = synclinkmp_pci_tbl,
 506         .probe          = synclinkmp_init_one,
 507         .remove         = __devexit_p(synclinkmp_remove_one),
 508 };
 509
 510
 511 static struct tty_driver *serial_driver;
 512
 513 /* number of characters left in xmit buffer before we ask for more */
 514 #define WAKEUP_CHARS 256
 515
 516
 517 /* tty callbacks */
 518
 519 static int  open(struct tty_struct *tty, struct file * filp);
 520 static void close(struct tty_struct *tty, struct file * filp);
 521 static void hangup(struct tty_struct *tty);
 522 static void set_termios(struct tty_struct *tty, struct termios *old_termios);
 523
 524 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
 525 static void put_char(struct tty_struct *tty, unsigned char ch);
 526 static void send_xchar(struct tty_struct *tty, char ch);
 527 static void wait_until_sent(struct tty_struct *tty, int timeout);
 528 static int  write_room(struct tty_struct *tty);
 529 static void flush_chars(struct tty_struct *tty);
 530 static void flush_buffer(struct tty_struct *tty);
 531 static void tx_hold(struct tty_struct *tty);
 532 static void tx_release(struct tty_struct *tty);
 533
 534 static int  ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
 535 static int  read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
 536 static int  chars_in_buffer(struct tty_struct *tty);
 537 static void throttle(struct tty_struct * tty);
 538 static void unthrottle(struct tty_struct * tty);
 539 static void set_break(struct tty_struct *tty, int break_state);
 540
 541 #ifdef CONFIG_HDLC
 542 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 543 static void hdlcdev_tx_done(SLMP_INFO *info);
 544 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
 545 static int  hdlcdev_init(SLMP_INFO *info);
 546 static void hdlcdev_exit(SLMP_INFO *info);
 547 #endif
 548
 549 /* ioctl handlers */
 550
 551 static int  get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
 552 static int  get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 553 static int  set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 554 static int  get_txidle(SLMP_INFO *info, int __user *idle_mode);
 555 static int  set_txidle(SLMP_INFO *info, int idle_mode);
 556 static int  tx_enable(SLMP_INFO *info, int enable);
 557 static int  tx_abort(SLMP_INFO *info);
 558 static int  rx_enable(SLMP_INFO *info, int enable);
 559 static int  modem_input_wait(SLMP_INFO *info,int arg);
 560 static int  wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
 561 static int  tiocmget(struct tty_struct *tty, struct file *file);
 562 static int  tiocmset(struct tty_struct *tty, struct file *file,
 563                      unsigned int set, unsigned int clear);
 564 static void set_break(struct tty_struct *tty, int break_state);
 565
 566 static void add_device(SLMP_INFO *info);
 567 static void device_init(int adapter_num, struct pci_dev *pdev);
 568 static int  claim_resources(SLMP_INFO *info);
 569 static void release_resources(SLMP_INFO *info);
 570
 571 static int  startup(SLMP_INFO *info);
 572 static int  block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
 573 static void shutdown(SLMP_INFO *info);
 574 static void program_hw(SLMP_INFO *info);
 575 static void change_params(SLMP_INFO *info);
 576
 577 static int  init_adapter(SLMP_INFO *info);
 578 static int  register_test(SLMP_INFO *info);
 579 static int  irq_test(SLMP_INFO *info);
 580 static int  loopback_test(SLMP_INFO *info);
 581 static int  adapter_test(SLMP_INFO *info);
 582 static int  memory_test(SLMP_INFO *info);
 583
 584 static void reset_adapter(SLMP_INFO *info);
 585 static void reset_port(SLMP_INFO *info);
 586 static void async_mode(SLMP_INFO *info);
 587 static void hdlc_mode(SLMP_INFO *info);
 588
 589 static void rx_stop(SLMP_INFO *info);
 590 static void rx_start(SLMP_INFO *info);
 591 static void rx_reset_buffers(SLMP_INFO *info);
 592 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
 593 static int  rx_get_frame(SLMP_INFO *info);
 594
 595 static void tx_start(SLMP_INFO *info);
 596 static void tx_stop(SLMP_INFO *info);
 597 static void tx_load_fifo(SLMP_INFO *info);
 598 static void tx_set_idle(SLMP_INFO *info);
 599 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
 600
 601 static void get_signals(SLMP_INFO *info);
 602 static void set_signals(SLMP_INFO *info);
 603 static void enable_loopback(SLMP_INFO *info, int enable);
 604 static void set_rate(SLMP_INFO *info, u32 data_rate);
 605
 606 static int  bh_action(SLMP_INFO *info);
 607 static void bh_handler(void* Context);
 608 static void bh_receive(SLMP_INFO *info);
 609 static void bh_transmit(SLMP_INFO *info);
 610 static void bh_status(SLMP_INFO *info);
 611 static void isr_timer(SLMP_INFO *info);
 612 static void isr_rxint(SLMP_INFO *info);
 613 static void isr_rxrdy(SLMP_INFO *info);
 614 static void isr_txint(SLMP_INFO *info);
 615 static void isr_txrdy(SLMP_INFO *info);
 616 static void isr_rxdmaok(SLMP_INFO *info);
 617 static void isr_rxdmaerror(SLMP_INFO *info);
 618 static void isr_txdmaok(SLMP_INFO *info);
 619 static void isr_txdmaerror(SLMP_INFO *info);
 620 static void isr_io_pin(SLMP_INFO *info, u16 status);
 621
 622 static int  alloc_dma_bufs(SLMP_INFO *info);
 623 static void free_dma_bufs(SLMP_INFO *info);
 624 static int  alloc_buf_list(SLMP_INFO *info);
 625 static int  alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
 626 static int  alloc_tmp_rx_buf(SLMP_INFO *info);
 627 static void free_tmp_rx_buf(SLMP_INFO *info);
 628
 629 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
 630 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
 631 static void tx_timeout(unsigned long context);
 632 static void status_timeout(unsigned long context);
 633
 634 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
 635 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
 636 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
 637 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
 638 static unsigned char read_status_reg(SLMP_INFO * info);
 639 static void write_control_reg(SLMP_INFO * info);
 640
 641
 642 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
 643 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
 644 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
 645
 646 static u32 misc_ctrl_value = 0x007e4040;
 647 static u32 lcr1_brdr_value = 0x00800028;
 648
 649 static u32 read_ahead_count = 8;
 650
 651 /* DPCR, DMA Priority Control
 652  *
 653  * 07..05  Not used, must be 0
 654  * 04      BRC, bus release condition: 0=all transfers complete
 655  *              1=release after 1 xfer on all channels
 656  * 03      CCC, channel change condition: 0=every cycle
 657  *              1=after each channel completes all xfers
 658  * 02..00  PR<2..0>, priority 100=round robin
 659  *
 660  * 00000100 = 0x00
 661  */
 662 static unsigned char dma_priority = 0x04;
 663
 664 // Number of bytes that can be written to shared RAM
 665 // in a single write operation
 666 static u32 sca_pci_load_interval = 64;
 667
 668 /*
 669  * 1st function defined in .text section. Calling this function in
 670  * init_module() followed by a breakpoint allows a remote debugger
 671  * (gdb) to get the .text address for the add-symbol-file command.
 672  * This allows remote debugging of dynamically loadable modules.
 673  */
 674 static void* synclinkmp_get_text_ptr(void);
 675 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
 676
 677 static inline int sanity_check(SLMP_INFO *info,
 678                                char *name, const char *routine)
 679 {
 680 #ifdef SANITY_CHECK
 681         static const char *badmagic =
 682                 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
 683         static const char *badinfo =
 684                 "Warning: null synclinkmp_struct for (%s) in %s\n";
 685
 686         if (!info) {
 687                 printk(badinfo, name, routine);
 688                 return 1;
 689         }
 690         if (info->magic != MGSL_MAGIC) {
 691                 printk(badmagic, name, routine);
 692                 return 1;
 693         }
 694 #else
 695         if (!info)
 696                 return 1;
 697 #endif
 698         return 0;
 699 }
 700
 701 /**
 702  * line discipline callback wrappers
 703  *
 704  * The wrappers maintain line discipline references
 705  * while calling into the line discipline.
 706  *
 707  * ldisc_receive_buf  - pass receive data to line discipline
 708  */
 709
 710 static void ldisc_receive_buf(struct tty_struct *tty,
 711                               const __u8 *data, char *flags, int count)
 712 {
 713         struct tty_ldisc *ld;
 714         if (!tty)
 715                 return;
 716         ld = tty_ldisc_ref(tty);
 717         if (ld) {
 718                 if (ld->receive_buf)
 719                         ld->receive_buf(tty, data, flags, count);
 720                 tty_ldisc_deref(ld);
 721         }
 722 }
 723
 724 /* tty callbacks */
 725
 726 /* Called when a port is opened.  Init and enable port.
 727  */
 728 static int open(struct tty_struct *tty, struct file *filp)
 729 {
 730         SLMP_INFO *info;
 731         int retval, line;
 732         unsigned long flags;
 733
 734         line = tty->index;
 735         if ((line < 0) || (line >= synclinkmp_device_count)) {
 736                 printk("%s(%d): open with invalid line #%d.\n",
 737                         __FILE__,__LINE__,line);
 738                 return -ENODEV;
 739         }
 740
 741         info = synclinkmp_device_list;
 742         while(info && info->line != line)
 743                 info = info->next_device;
 744         if (sanity_check(info, tty->name, "open"))
 745                 return -ENODEV;
 746         if ( info->init_error ) {
 747                 printk("%s(%d):%s device is not allocated, init error=%d\n",
 748                         __FILE__,__LINE__,info->device_name,info->init_error);
 749                 return -ENODEV;
 750         }
 751
 752         tty->driver_data = info;
 753         info->tty = tty;
 754
 755         if (debug_level >= DEBUG_LEVEL_INFO)
 756                 printk("%s(%d):%s open(), old ref count = %d\n",
 757                          __FILE__,__LINE__,tty->driver->name, info->count);
 758
 759         /* If port is closing, signal caller to try again */
 760         if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
 761                 if (info->flags & ASYNC_CLOSING)
 762                         interruptible_sleep_on(&info->close_wait);
 763                 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
 764                         -EAGAIN : -ERESTARTSYS);
 765                 goto cleanup;
 766         }
 767
 768         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 769
 770         spin_lock_irqsave(&info->netlock, flags);
 771         if (info->netcount) {
 772                 retval = -EBUSY;
 773                 spin_unlock_irqrestore(&info->netlock, flags);
 774                 goto cleanup;
 775         }
 776         info->count++;
 777         spin_unlock_irqrestore(&info->netlock, flags);
 778
 779         if (info->count == 1) {
 780                 /* 1st open on this device, init hardware */
 781                 retval = startup(info);
 782                 if (retval < 0)
 783                         goto cleanup;
 784         }
 785
 786         retval = block_til_ready(tty, filp, info);
 787         if (retval) {
 788                 if (debug_level >= DEBUG_LEVEL_INFO)
 789                         printk("%s(%d):%s block_til_ready() returned %d\n",
 790                                  __FILE__,__LINE__, info->device_name, retval);
 791                 goto cleanup;
 792         }
 793
 794         if (debug_level >= DEBUG_LEVEL_INFO)
 795                 printk("%s(%d):%s open() success\n",
 796                          __FILE__,__LINE__, info->device_name);
 797         retval = 0;
 798
 799 cleanup:
 800         if (retval) {
 801                 if (tty->count == 1)
 802                         info->tty = NULL; /* tty layer will release tty struct */
 803                 if(info->count)
 804                         info->count--;
 805         }
 806
 807         return retval;
 808 }
 809
 810 /* Called when port is closed. Wait for remaining data to be
 811  * sent. Disable port and free resources.
 812  */
 813 static void close(struct tty_struct *tty, struct file *filp)
 814 {
 815         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
 816
 817         if (sanity_check(info, tty->name, "close"))
 818                 return;
 819
 820         if (debug_level >= DEBUG_LEVEL_INFO)
 821                 printk("%s(%d):%s close() entry, count=%d\n",
 822                          __FILE__,__LINE__, info->device_name, info->count);
 823
 824         if (!info->count)
 825                 return;
 826
 827         if (tty_hung_up_p(filp))
 828                 goto cleanup;
 829
 830         if ((tty->count == 1) && (info->count != 1)) {
 831                 /*
 832                  * tty->count is 1 and the tty structure will be freed.
 833                  * info->count should be one in this case.
 834                  * if it's not, correct it so that the port is shutdown.
 835                  */
 836                 printk("%s(%d):%s close: bad refcount; tty->count is 1, "
 837                        "info->count is %d\n",
 838                          __FILE__,__LINE__, info->device_name, info->count);
 839                 info->count = 1;
 840         }
 841
 842         info->count--;
 843
 844         /* if at least one open remaining, leave hardware active */
 845         if (info->count)
 846                 goto cleanup;
 847
 848         info->flags |= ASYNC_CLOSING;
 849
 850         /* set tty->closing to notify line discipline to
 851          * only process XON/XOFF characters. Only the N_TTY
 852          * discipline appears to use this (ppp does not).
 853          */
 854         tty->closing = 1;
 855
 856         /* wait for transmit data to clear all layers */
 857
 858         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
 859                 if (debug_level >= DEBUG_LEVEL_INFO)
 860                         printk("%s(%d):%s close() calling tty_wait_until_sent\n",
 861                                  __FILE__,__LINE__, info->device_name );
 862                 tty_wait_until_sent(tty, info->closing_wait);
 863         }
 864
 865         if (info->flags & ASYNC_INITIALIZED)
 866                 wait_until_sent(tty, info->timeout);
 867
 868         if (tty->driver->flush_buffer)
 869                 tty->driver->flush_buffer(tty);
 870
 871         tty_ldisc_flush(tty);
 872
 873         shutdown(info);
 874
 875         tty->closing = 0;
 876         info->tty = NULL;
 877
 878         if (info->blocked_open) {
 879                 if (info->close_delay) {
 880                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
 881                 }
 882                 wake_up_interruptible(&info->open_wait);
 883         }
 884
 885         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 886
 887         wake_up_interruptible(&info->close_wait);
 888
 889 cleanup:
 890         if (debug_level >= DEBUG_LEVEL_INFO)
 891                 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
 892                         tty->driver->name, info->count);
 893 }
 894
 895 /* Called by tty_hangup() when a hangup is signaled.
 896  * This is the same as closing all open descriptors for the port.
 897  */
 898 static void hangup(struct tty_struct *tty)
 899 {
 900         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 901
 902         if (debug_level >= DEBUG_LEVEL_INFO)
 903                 printk("%s(%d):%s hangup()\n",
 904                          __FILE__,__LINE__, info->device_name );
 905
 906         if (sanity_check(info, tty->name, "hangup"))
 907                 return;
 908
 909         flush_buffer(tty);
 910         shutdown(info);
 911
 912         info->count = 0;
 913         info->flags &= ~ASYNC_NORMAL_ACTIVE;
 914         info->tty = NULL;
 915
 916         wake_up_interruptible(&info->open_wait);
 917 }
 918
 919 /* Set new termios settings
 920  */
 921 static void set_termios(struct tty_struct *tty, struct termios *old_termios)
 922 {
 923         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 924         unsigned long flags;
 925
 926         if (debug_level >= DEBUG_LEVEL_INFO)
 927                 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
 928                         tty->driver->name );
 929
 930         /* just return if nothing has changed */
 931         if ((tty->termios->c_cflag == old_termios->c_cflag)
 932             && (RELEVANT_IFLAG(tty->termios->c_iflag)
 933                 == RELEVANT_IFLAG(old_termios->c_iflag)))
 934           return;
 935
 936         change_params(info);
 937
 938         /* Handle transition to B0 status */
 939         if (old_termios->c_cflag & CBAUD &&
 940             !(tty->termios->c_cflag & CBAUD)) {
 941                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
 942                 spin_lock_irqsave(&info->lock,flags);
 943                 set_signals(info);
 944                 spin_unlock_irqrestore(&info->lock,flags);
 945         }
 946
 947         /* Handle transition away from B0 status */
 948         if (!(old_termios->c_cflag & CBAUD) &&
 949             tty->termios->c_cflag & CBAUD) {
 950                 info->serial_signals |= SerialSignal_DTR;
 951                 if (!(tty->termios->c_cflag & CRTSCTS) ||
 952                     !test_bit(TTY_THROTTLED, &tty->flags)) {
 953                         info->serial_signals |= SerialSignal_RTS;
 954                 }
 955                 spin_lock_irqsave(&info->lock,flags);
 956                 set_signals(info);
 957                 spin_unlock_irqrestore(&info->lock,flags);
 958         }
 959
 960         /* Handle turning off CRTSCTS */
 961         if (old_termios->c_cflag & CRTSCTS &&
 962             !(tty->termios->c_cflag & CRTSCTS)) {
 963                 tty->hw_stopped = 0;
 964                 tx_release(tty);
 965         }
 966 }
 967
 968 /* Send a block of data
 969  *
 970  * Arguments:
 971  *
 972  *      tty             pointer to tty information structure
 973  *      buf             pointer to buffer containing send data
 974  *      count           size of send data in bytes
 975  *
 976  * Return Value:        number of characters written
 977  */
 978 static int write(struct tty_struct *tty,
 979                  const unsigned char *buf, int count)
 980 {
 981         int     c, ret = 0;
 982         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 983         unsigned long flags;
 984
 985         if (debug_level >= DEBUG_LEVEL_INFO)
 986                 printk("%s(%d):%s write() count=%d\n",
 987                        __FILE__,__LINE__,info->device_name,count);
 988
 989         if (sanity_check(info, tty->name, "write"))
 990                 goto cleanup;
 991
 992         if (!tty || !info->tx_buf)
 993                 goto cleanup;
 994
 995         if (info->params.mode == MGSL_MODE_HDLC) {
 996                 if (count > info->max_frame_size) {
 997                         ret = -EIO;
 998                         goto cleanup;
 999                 }
1000                 if (info->tx_active)
1001                         goto cleanup;
1002                 if (info->tx_count) {
1003                         /* send accumulated data from send_char() calls */
1004                         /* as frame and wait before accepting more data. */
1005                         tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
1006                         goto start;
1007                 }
1008                 ret = info->tx_count = count;
1009                 tx_load_dma_buffer(info, buf, count);
1010                 goto start;
1011         }
1012
1013         for (;;) {
1014                 c = min_t(int, count,
1015                         min(info->max_frame_size - info->tx_count - 1,
1016                             info->max_frame_size - info->tx_put));
1017                 if (c <= 0)
1018                         break;
1019
1020                 memcpy(info->tx_buf + info->tx_put, buf, c);
1021
1022                 spin_lock_irqsave(&info->lock,flags);
1023                 info->tx_put += c;
1024                 if (info->tx_put >= info->max_frame_size)
1025                         info->tx_put -= info->max_frame_size;
1026                 info->tx_count += c;
1027                 spin_unlock_irqrestore(&info->lock,flags);
1028
1029                 buf += c;
1030                 count -= c;
1031                 ret += c;
1032         }
1033
1034         if (info->params.mode == MGSL_MODE_HDLC) {
1035                 if (count) {
1036                         ret = info->tx_count = 0;
1037                         goto cleanup;
1038                 }
1039                 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
1040         }
1041 start:
1042         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1043                 spin_lock_irqsave(&info->lock,flags);
1044                 if (!info->tx_active)
1045                         tx_start(info);
1046                 spin_unlock_irqrestore(&info->lock,flags);
1047         }
1048
1049 cleanup:
1050         if (debug_level >= DEBUG_LEVEL_INFO)
1051                 printk( "%s(%d):%s write() returning=%d\n",
1052                         __FILE__,__LINE__,info->device_name,ret);
1053         return ret;
1054 }
1055
1056 /* Add a character to the transmit buffer.
1057  */
1058 static void put_char(struct tty_struct *tty, unsigned char ch)
1059 {
1060         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1061         unsigned long flags;
1062
1063         if ( debug_level >= DEBUG_LEVEL_INFO ) {
1064                 printk( "%s(%d):%s put_char(%d)\n",
1065                         __FILE__,__LINE__,info->device_name,ch);
1066         }
1067
1068         if (sanity_check(info, tty->name, "put_char"))
1069                 return;
1070
1071         if (!tty || !info->tx_buf)
1072                 return;
1073
1074         spin_lock_irqsave(&info->lock,flags);
1075
1076         if ( (info->params.mode != MGSL_MODE_HDLC) ||
1077              !info->tx_active ) {
1078
1079                 if (info->tx_count < info->max_frame_size - 1) {
1080                         info->tx_buf[info->tx_put++] = ch;
1081                         if (info->tx_put >= info->max_frame_size)
1082                                 info->tx_put -= info->max_frame_size;
1083                         info->tx_count++;
1084                 }
1085         }
1086
1087         spin_unlock_irqrestore(&info->lock,flags);
1088 }
1089
1090 /* Send a high-priority XON/XOFF character
1091  */
1092 static void send_xchar(struct tty_struct *tty, char ch)
1093 {
1094         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1095         unsigned long flags;
1096
1097         if (debug_level >= DEBUG_LEVEL_INFO)
1098                 printk("%s(%d):%s send_xchar(%d)\n",
1099                          __FILE__,__LINE__, info->device_name, ch );
1100
1101         if (sanity_check(info, tty->name, "send_xchar"))
1102                 return;
1103
1104         info->x_char = ch;
1105         if (ch) {
1106                 /* Make sure transmit interrupts are on */
1107                 spin_lock_irqsave(&info->lock,flags);
1108                 if (!info->tx_enabled)
1109                         tx_start(info);
1110                 spin_unlock_irqrestore(&info->lock,flags);
1111         }
1112 }
1113
1114 /* Wait until the transmitter is empty.
1115  */
1116 static void wait_until_sent(struct tty_struct *tty, int timeout)
1117 {
1118         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1119         unsigned long orig_jiffies, char_time;
1120
1121         if (!info )
1122                 return;
1123
1124         if (debug_level >= DEBUG_LEVEL_INFO)
1125                 printk("%s(%d):%s wait_until_sent() entry\n",
1126                          __FILE__,__LINE__, info->device_name );
1127
1128         if (sanity_check(info, tty->name, "wait_until_sent"))
1129                 return;
1130
1131         if (!(info->flags & ASYNC_INITIALIZED))
1132                 goto exit;
1133
1134         orig_jiffies = jiffies;
1135
1136         /* Set check interval to 1/5 of estimated time to
1137          * send a character, and make it at least 1. The check
1138          * interval should also be less than the timeout.
1139          * Note: use tight timings here to satisfy the NIST-PCTS.
1140          */
1141
1142         if ( info->params.data_rate ) {
1143                 char_time = info->timeout/(32 * 5);
1144                 if (!char_time)
1145                         char_time++;
1146         } else
1147                 char_time = 1;
1148
1149         if (timeout)
1150                 char_time = min_t(unsigned long, char_time, timeout);
1151
1152         if ( info->params.mode == MGSL_MODE_HDLC ) {
1153                 while (info->tx_active) {
1154                         msleep_interruptible(jiffies_to_msecs(char_time));
1155                         if (signal_pending(current))
1156                                 break;
1157                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1158                                 break;
1159                 }
1160         } else {
1161                 //TODO: determine if there is something similar to USC16C32
1162                 //      TXSTATUS_ALL_SENT status
1163                 while ( info->tx_active && info->tx_enabled) {
1164                         msleep_interruptible(jiffies_to_msecs(char_time));
1165                         if (signal_pending(current))
1166                                 break;
1167                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1168                                 break;
1169                 }
1170         }
1171
1172 exit:
1173         if (debug_level >= DEBUG_LEVEL_INFO)
1174                 printk("%s(%d):%s wait_until_sent() exit\n",
1175                          __FILE__,__LINE__, info->device_name );
1176 }
1177
1178 /* Return the count of free bytes in transmit buffer
1179  */
1180 static int write_room(struct tty_struct *tty)
1181 {
1182         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1183         int ret;
1184
1185         if (sanity_check(info, tty->name, "write_room"))
1186                 return 0;
1187
1188         if (info->params.mode == MGSL_MODE_HDLC) {
1189                 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1190         } else {
1191                 ret = info->max_frame_size - info->tx_count - 1;
1192                 if (ret < 0)
1193                         ret = 0;
1194         }
1195
1196         if (debug_level >= DEBUG_LEVEL_INFO)
1197                 printk("%s(%d):%s write_room()=%d\n",
1198                        __FILE__, __LINE__, info->device_name, ret);
1199
1200         return ret;
1201 }
1202
1203 /* enable transmitter and send remaining buffered characters
1204  */
1205 static void flush_chars(struct tty_struct *tty)
1206 {
1207         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1208         unsigned long flags;
1209
1210         if ( debug_level >= DEBUG_LEVEL_INFO )
1211                 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1212                         __FILE__,__LINE__,info->device_name,info->tx_count);
1213
1214         if (sanity_check(info, tty->name, "flush_chars"))
1215                 return;
1216
1217         if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1218             !info->tx_buf)
1219                 return;
1220
1221         if ( debug_level >= DEBUG_LEVEL_INFO )
1222                 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1223                         __FILE__,__LINE__,info->device_name );
1224
1225         spin_lock_irqsave(&info->lock,flags);
1226
1227         if (!info->tx_active) {
1228                 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1229                         info->tx_count ) {
1230                         /* operating in synchronous (frame oriented) mode */
1231                         /* copy data from circular tx_buf to */
1232                         /* transmit DMA buffer. */
1233                         tx_load_dma_buffer(info,
1234                                  info->tx_buf,info->tx_count);
1235                 }
1236                 tx_start(info);
1237         }
1238
1239         spin_unlock_irqrestore(&info->lock,flags);
1240 }
1241
1242 /* Discard all data in the send buffer
1243  */
1244 static void flush_buffer(struct tty_struct *tty)
1245 {
1246         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1247         unsigned long flags;
1248
1249         if (debug_level >= DEBUG_LEVEL_INFO)
1250                 printk("%s(%d):%s flush_buffer() entry\n",
1251                          __FILE__,__LINE__, info->device_name );
1252
1253         if (sanity_check(info, tty->name, "flush_buffer"))
1254                 return;
1255
1256         spin_lock_irqsave(&info->lock,flags);
1257         info->tx_count = info->tx_put = info->tx_get = 0;
1258         del_timer(&info->tx_timer);
1259         spin_unlock_irqrestore(&info->lock,flags);
1260
1261         wake_up_interruptible(&tty->write_wait);
1262         tty_wakeup(tty);
1263 }
1264
1265 /* throttle (stop) transmitter
1266  */
1267 static void tx_hold(struct tty_struct *tty)
1268 {
1269         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1270         unsigned long flags;
1271
1272         if (sanity_check(info, tty->name, "tx_hold"))
1273                 return;
1274
1275         if ( debug_level >= DEBUG_LEVEL_INFO )
1276                 printk("%s(%d):%s tx_hold()\n",
1277                         __FILE__,__LINE__,info->device_name);
1278
1279         spin_lock_irqsave(&info->lock,flags);
1280         if (info->tx_enabled)
1281                 tx_stop(info);
1282         spin_unlock_irqrestore(&info->lock,flags);
1283 }
1284
1285 /* release (start) transmitter
1286  */
1287 static void tx_release(struct tty_struct *tty)
1288 {
1289         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1290         unsigned long flags;
1291
1292         if (sanity_check(info, tty->name, "tx_release"))
1293                 return;
1294
1295         if ( debug_level >= DEBUG_LEVEL_INFO )
1296                 printk("%s(%d):%s tx_release()\n",
1297                         __FILE__,__LINE__,info->device_name);
1298
1299         spin_lock_irqsave(&info->lock,flags);
1300         if (!info->tx_enabled)
1301                 tx_start(info);
1302         spin_unlock_irqrestore(&info->lock,flags);
1303 }
1304
1305 /* Service an IOCTL request
1306  *
1307  * Arguments:
1308  *
1309  *      tty     pointer to tty instance data
1310  *      file    pointer to associated file object for device
1311  *      cmd     IOCTL command code
1312  *      arg     command argument/context
1313  *
1314  * Return Value:        0 if success, otherwise error code
1315  */
1316 static int ioctl(struct tty_struct *tty, struct file *file,
1317                  unsigned int cmd, unsigned long arg)
1318 {
1319         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1320         int error;
1321         struct mgsl_icount cnow;        /* kernel counter temps */
1322         struct serial_icounter_struct __user *p_cuser;  /* user space */
1323         unsigned long flags;
1324         void __user *argp = (void __user *)arg;
1325
1326         if (debug_level >= DEBUG_LEVEL_INFO)
1327                 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1328                         info->device_name, cmd );
1329
1330         if (sanity_check(info, tty->name, "ioctl"))
1331                 return -ENODEV;
1332
1333         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1334             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1335                 if (tty->flags & (1 << TTY_IO_ERROR))
1336                     return -EIO;
1337         }
1338
1339         switch (cmd) {
1340         case MGSL_IOCGPARAMS:
1341                 return get_params(info, argp);
1342         case MGSL_IOCSPARAMS:
1343                 return set_params(info, argp);
1344         case MGSL_IOCGTXIDLE:
1345                 return get_txidle(info, argp);
1346         case MGSL_IOCSTXIDLE:
1347                 return set_txidle(info, (int)arg);
1348         case MGSL_IOCTXENABLE:
1349                 return tx_enable(info, (int)arg);
1350         case MGSL_IOCRXENABLE:
1351                 return rx_enable(info, (int)arg);
1352         case MGSL_IOCTXABORT:
1353                 return tx_abort(info);
1354         case MGSL_IOCGSTATS:
1355                 return get_stats(info, argp);
1356         case MGSL_IOCWAITEVENT:
1357                 return wait_mgsl_event(info, argp);
1358         case MGSL_IOCLOOPTXDONE:
1359                 return 0; // TODO: Not supported, need to document
1360                 /* Wait for modem input (DCD,RI,DSR,CTS) change
1361                  * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1362                  */
1363         case TIOCMIWAIT:
1364                 return modem_input_wait(info,(int)arg);
1365
1366                 /*
1367                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1368                  * Return: write counters to the user passed counter struct
1369                  * NB: both 1->0 and 0->1 transitions are counted except for
1370                  *     RI where only 0->1 is counted.
1371                  */
1372         case TIOCGICOUNT:
1373                 spin_lock_irqsave(&info->lock,flags);
1374                 cnow = info->icount;
1375                 spin_unlock_irqrestore(&info->lock,flags);
1376                 p_cuser = argp;
1377                 PUT_USER(error,cnow.cts, &p_cuser->cts);
1378                 if (error) return error;
1379                 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
1380                 if (error) return error;
1381                 PUT_USER(error,cnow.rng, &p_cuser->rng);
1382                 if (error) return error;
1383                 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
1384                 if (error) return error;
1385                 PUT_USER(error,cnow.rx, &p_cuser->rx);
1386                 if (error) return error;
1387                 PUT_USER(error,cnow.tx, &p_cuser->tx);
1388                 if (error) return error;
1389                 PUT_USER(error,cnow.frame, &p_cuser->frame);
1390                 if (error) return error;
1391                 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
1392                 if (error) return error;
1393                 PUT_USER(error,cnow.parity, &p_cuser->parity);
1394                 if (error) return error;
1395                 PUT_USER(error,cnow.brk, &p_cuser->brk);
1396                 if (error) return error;
1397                 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
1398                 if (error) return error;
1399                 return 0;
1400         default:
1401                 return -ENOIOCTLCMD;
1402         }
1403         return 0;
1404 }
1405
1406 /*
1407  * /proc fs routines....
1408  */
1409
1410 static inline int line_info(char *buf, SLMP_INFO *info)
1411 {
1412         char    stat_buf[30];
1413         int     ret;
1414         unsigned long flags;
1415
1416         ret = sprintf(buf, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1417                        "\tIRQ=%d MaxFrameSize=%u\n",
1418                 info->device_name,
1419                 info->phys_sca_base,
1420                 info->phys_memory_base,
1421                 info->phys_statctrl_base,
1422                 info->phys_lcr_base,
1423                 info->irq_level,
1424                 info->max_frame_size );
1425
1426         /* output current serial signal states */
1427         spin_lock_irqsave(&info->lock,flags);
1428         get_signals(info);
1429         spin_unlock_irqrestore(&info->lock,flags);
1430
1431         stat_buf[0] = 0;
1432         stat_buf[1] = 0;
1433         if (info->serial_signals & SerialSignal_RTS)
1434                 strcat(stat_buf, "|RTS");
1435         if (info->serial_signals & SerialSignal_CTS)
1436                 strcat(stat_buf, "|CTS");
1437         if (info->serial_signals & SerialSignal_DTR)
1438                 strcat(stat_buf, "|DTR");
1439         if (info->serial_signals & SerialSignal_DSR)
1440                 strcat(stat_buf, "|DSR");
1441         if (info->serial_signals & SerialSignal_DCD)
1442                 strcat(stat_buf, "|CD");
1443         if (info->serial_signals & SerialSignal_RI)
1444                 strcat(stat_buf, "|RI");
1445
1446         if (info->params.mode == MGSL_MODE_HDLC) {
1447                 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1448                               info->icount.txok, info->icount.rxok);
1449                 if (info->icount.txunder)
1450                         ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1451                 if (info->icount.txabort)
1452                         ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1453                 if (info->icount.rxshort)
1454                         ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1455                 if (info->icount.rxlong)
1456                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1457                 if (info->icount.rxover)
1458                         ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1459                 if (info->icount.rxcrc)
1460                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxcrc);
1461         } else {
1462                 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1463                               info->icount.tx, info->icount.rx);
1464                 if (info->icount.frame)
1465                         ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1466                 if (info->icount.parity)
1467                         ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1468                 if (info->icount.brk)
1469                         ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1470                 if (info->icount.overrun)
1471                         ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1472         }
1473
1474         /* Append serial signal status to end */
1475         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1476
1477         ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1478          info->tx_active,info->bh_requested,info->bh_running,
1479          info->pending_bh);
1480
1481         return ret;
1482 }
1483
1484 /* Called to print information about devices
1485  */
1486 int read_proc(char *page, char **start, off_t off, int count,
1487               int *eof, void *data)
1488 {
1489         int len = 0, l;
1490         off_t   begin = 0;
1491         SLMP_INFO *info;
1492
1493         len += sprintf(page, "synclinkmp driver:%s\n", driver_version);
1494
1495         info = synclinkmp_device_list;
1496         while( info ) {
1497                 l = line_info(page + len, info);
1498                 len += l;
1499                 if (len+begin > off+count)
1500                         goto done;
1501                 if (len+begin < off) {
1502                         begin += len;
1503                         len = 0;
1504                 }
1505                 info = info->next_device;
1506         }
1507
1508         *eof = 1;
1509 done:
1510         if (off >= len+begin)
1511                 return 0;
1512         *start = page + (off-begin);
1513         return ((count < begin+len-off) ? count : begin+len-off);
1514 }
1515
1516 /* Return the count of bytes in transmit buffer
1517  */
1518 static int chars_in_buffer(struct tty_struct *tty)
1519 {
1520         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1521
1522         if (sanity_check(info, tty->name, "chars_in_buffer"))
1523                 return 0;
1524
1525         if (debug_level >= DEBUG_LEVEL_INFO)
1526                 printk("%s(%d):%s chars_in_buffer()=%d\n",
1527                        __FILE__, __LINE__, info->device_name, info->tx_count);
1528
1529         return info->tx_count;
1530 }
1531
1532 /* Signal remote device to throttle send data (our receive data)
1533  */
1534 static void throttle(struct tty_struct * tty)
1535 {
1536         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1537         unsigned long flags;
1538
1539         if (debug_level >= DEBUG_LEVEL_INFO)
1540                 printk("%s(%d):%s throttle() entry\n",
1541                          __FILE__,__LINE__, info->device_name );
1542
1543         if (sanity_check(info, tty->name, "throttle"))
1544                 return;
1545
1546         if (I_IXOFF(tty))
1547                 send_xchar(tty, STOP_CHAR(tty));
1548
1549         if (tty->termios->c_cflag & CRTSCTS) {
1550                 spin_lock_irqsave(&info->lock,flags);
1551                 info->serial_signals &= ~SerialSignal_RTS;
1552                 set_signals(info);
1553                 spin_unlock_irqrestore(&info->lock,flags);
1554         }
1555 }
1556
1557 /* Signal remote device to stop throttling send data (our receive data)
1558  */
1559 static void unthrottle(struct tty_struct * tty)
1560 {
1561         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1562         unsigned long flags;
1563
1564         if (debug_level >= DEBUG_LEVEL_INFO)
1565                 printk("%s(%d):%s unthrottle() entry\n",
1566                          __FILE__,__LINE__, info->device_name );
1567
1568         if (sanity_check(info, tty->name, "unthrottle"))
1569                 return;
1570
1571         if (I_IXOFF(tty)) {
1572                 if (info->x_char)
1573                         info->x_char = 0;
1574                 else
1575                         send_xchar(tty, START_CHAR(tty));
1576         }
1577
1578         if (tty->termios->c_cflag & CRTSCTS) {
1579                 spin_lock_irqsave(&info->lock,flags);
1580                 info->serial_signals |= SerialSignal_RTS;
1581                 set_signals(info);
1582                 spin_unlock_irqrestore(&info->lock,flags);
1583         }
1584 }
1585
1586 /* set or clear transmit break condition
1587  * break_state  -1=set break condition, 0=clear
1588  */
1589 static void set_break(struct tty_struct *tty, int break_state)
1590 {
1591         unsigned char RegValue;
1592         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1593         unsigned long flags;
1594
1595         if (debug_level >= DEBUG_LEVEL_INFO)
1596                 printk("%s(%d):%s set_break(%d)\n",
1597                          __FILE__,__LINE__, info->device_name, break_state);
1598
1599         if (sanity_check(info, tty->name, "set_break"))
1600                 return;
1601
1602         spin_lock_irqsave(&info->lock,flags);
1603         RegValue = read_reg(info, CTL);
1604         if (break_state == -1)
1605                 RegValue |= BIT3;
1606         else
1607                 RegValue &= ~BIT3;
1608         write_reg(info, CTL, RegValue);
1609         spin_unlock_irqrestore(&info->lock,flags);
1610 }
1611
1612 #ifdef CONFIG_HDLC
1613
1614 /**
1615  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1616  * set encoding and frame check sequence (FCS) options
1617  *
1618  * dev       pointer to network device structure
1619  * encoding  serial encoding setting
1620  * parity    FCS setting
1621  *
1622  * returns 0 if success, otherwise error code
1623  */
1624 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1625                           unsigned short parity)
1626 {
1627         SLMP_INFO *info = dev_to_port(dev);
1628         unsigned char  new_encoding;
1629         unsigned short new_crctype;
1630
1631         /* return error if TTY interface open */
1632         if (info->count)
1633                 return -EBUSY;
1634
1635         switch (encoding)
1636         {
1637         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1638         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1639         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1640         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1641         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1642         default: return -EINVAL;
1643         }
1644
1645         switch (parity)
1646         {
1647         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1648         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1649         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1650         default: return -EINVAL;
1651         }
1652
1653         info->params.encoding = new_encoding;
1654         info->params.crc_type = new_crctype;;
1655
1656         /* if network interface up, reprogram hardware */
1657         if (info->netcount)
1658                 program_hw(info);
1659
1660         return 0;
1661 }
1662
1663 /**
1664  * called by generic HDLC layer to send frame
1665  *
1666  * skb  socket buffer containing HDLC frame
1667  * dev  pointer to network device structure
1668  *
1669  * returns 0 if success, otherwise error code
1670  */
1671 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1672 {
1673         SLMP_INFO *info = dev_to_port(dev);
1674         struct net_device_stats *stats = hdlc_stats(dev);
1675         unsigned long flags;
1676
1677         if (debug_level >= DEBUG_LEVEL_INFO)
1678                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1679
1680         /* stop sending until this frame completes */
1681         netif_stop_queue(dev);
1682
1683         /* copy data to device buffers */
1684         info->tx_count = skb->len;
1685         tx_load_dma_buffer(info, skb->data, skb->len);
1686
1687         /* update network statistics */
1688         stats->tx_packets++;
1689         stats->tx_bytes += skb->len;
1690
1691         /* done with socket buffer, so free it */
1692         dev_kfree_skb(skb);
1693
1694         /* save start time for transmit timeout detection */
1695         dev->trans_start = jiffies;
1696
1697         /* start hardware transmitter if necessary */
1698         spin_lock_irqsave(&info->lock,flags);
1699         if (!info->tx_active)
1700                 tx_start(info);
1701         spin_unlock_irqrestore(&info->lock,flags);
1702
1703         return 0;
1704 }
1705
1706 /**
1707  * called by network layer when interface enabled
1708  * claim resources and initialize hardware
1709  *
1710  * dev  pointer to network device structure
1711  *
1712  * returns 0 if success, otherwise error code
1713  */
1714 static int hdlcdev_open(struct net_device *dev)
1715 {
1716         SLMP_INFO *info = dev_to_port(dev);
1717         int rc;
1718         unsigned long flags;
1719
1720         if (debug_level >= DEBUG_LEVEL_INFO)
1721                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1722
1723         /* generic HDLC layer open processing */
1724         if ((rc = hdlc_open(dev)))
1725                 return rc;
1726
1727         /* arbitrate between network and tty opens */
1728         spin_lock_irqsave(&info->netlock, flags);
1729         if (info->count != 0 || info->netcount != 0) {
1730                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1731                 spin_unlock_irqrestore(&info->netlock, flags);
1732                 return -EBUSY;
1733         }
1734         info->netcount=1;
1735         spin_unlock_irqrestore(&info->netlock, flags);
1736
1737         /* claim resources and init adapter */
1738         if ((rc = startup(info)) != 0) {
1739                 spin_lock_irqsave(&info->netlock, flags);
1740                 info->netcount=0;
1741                 spin_unlock_irqrestore(&info->netlock, flags);
1742                 return rc;
1743         }
1744
1745         /* assert DTR and RTS, apply hardware settings */
1746         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1747         program_hw(info);
1748
1749         /* enable network layer transmit */
1750         dev->trans_start = jiffies;
1751         netif_start_queue(dev);
1752
1753         /* inform generic HDLC layer of current DCD status */
1754         spin_lock_irqsave(&info->lock, flags);
1755         get_signals(info);
1756         spin_unlock_irqrestore(&info->lock, flags);
1757         hdlc_set_carrier(info->serial_signals & SerialSignal_DCD, dev);
1758
1759         return 0;
1760 }
1761
1762 /**
1763  * called by network layer when interface is disabled
1764  * shutdown hardware and release resources
1765  *
1766  * dev  pointer to network device structure
1767  *
1768  * returns 0 if success, otherwise error code
1769  */
1770 static int hdlcdev_close(struct net_device *dev)
1771 {
1772         SLMP_INFO *info = dev_to_port(dev);
1773         unsigned long flags;
1774
1775         if (debug_level >= DEBUG_LEVEL_INFO)
1776                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1777
1778         netif_stop_queue(dev);
1779
1780         /* shutdown adapter and release resources */
1781         shutdown(info);
1782
1783         hdlc_close(dev);
1784
1785         spin_lock_irqsave(&info->netlock, flags);
1786         info->netcount=0;
1787         spin_unlock_irqrestore(&info->netlock, flags);
1788
1789         return 0;
1790 }
1791
1792 /**
1793  * called by network layer to process IOCTL call to network device
1794  *
1795  * dev  pointer to network device structure
1796  * ifr  pointer to network interface request structure
1797  * cmd  IOCTL command code
1798  *
1799  * returns 0 if success, otherwise error code
1800  */
1801 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1802 {
1803         const size_t size = sizeof(sync_serial_settings);
1804         sync_serial_settings new_line;
1805         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1806         SLMP_INFO *info = dev_to_port(dev);
1807         unsigned int flags;
1808
1809         if (debug_level >= DEBUG_LEVEL_INFO)
1810                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1811
1812         /* return error if TTY interface open */
1813         if (info->count)
1814                 return -EBUSY;
1815
1816         if (cmd != SIOCWANDEV)
1817                 return hdlc_ioctl(dev, ifr, cmd);
1818
1819         switch(ifr->ifr_settings.type) {
1820         case IF_GET_IFACE: /* return current sync_serial_settings */
1821
1822                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1823                 if (ifr->ifr_settings.size < size) {
1824                         ifr->ifr_settings.size = size; /* data size wanted */
1825                         return -ENOBUFS;
1826                 }
1827
1828                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1829                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1830                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1831                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1832
1833                 switch (flags){
1834                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1835                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1836                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1837                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1838                 default: new_line.clock_type = CLOCK_DEFAULT;
1839                 }
1840
1841                 new_line.clock_rate = info->params.clock_speed;
1842                 new_line.loopback   = info->params.loopback ? 1:0;
1843
1844                 if (copy_to_user(line, &new_line, size))
1845                         return -EFAULT;
1846                 return 0;
1847
1848         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1849
1850                 if(!capable(CAP_NET_ADMIN))
1851                         return -EPERM;
1852                 if (copy_from_user(&new_line, line, size))
1853                         return -EFAULT;
1854
1855                 switch (new_line.clock_type)
1856                 {
1857                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1858                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1859                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1860                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1861                 case CLOCK_DEFAULT:  flags = info->params.flags &
1862                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1863                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1864                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1865                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1866                 default: return -EINVAL;
1867                 }
1868
1869                 if (new_line.loopback != 0 && new_line.loopback != 1)
1870                         return -EINVAL;
1871
1872                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1873                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1874                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1875                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1876                 info->params.flags |= flags;
1877
1878                 info->params.loopback = new_line.loopback;
1879
1880                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1881                         info->params.clock_speed = new_line.clock_rate;
1882                 else
1883                         info->params.clock_speed = 0;
1884
1885                 /* if network interface up, reprogram hardware */
1886                 if (info->netcount)
1887                         program_hw(info);
1888                 return 0;
1889
1890         default:
1891                 return hdlc_ioctl(dev, ifr, cmd);
1892         }
1893 }
1894
1895 /**
1896  * called by network layer when transmit timeout is detected
1897  *
1898  * dev  pointer to network device structure
1899  */
1900 static void hdlcdev_tx_timeout(struct net_device *dev)
1901 {
1902         SLMP_INFO *info = dev_to_port(dev);
1903         struct net_device_stats *stats = hdlc_stats(dev);
1904         unsigned long flags;
1905
1906         if (debug_level >= DEBUG_LEVEL_INFO)
1907                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1908
1909         stats->tx_errors++;
1910         stats->tx_aborted_errors++;
1911
1912         spin_lock_irqsave(&info->lock,flags);
1913         tx_stop(info);
1914         spin_unlock_irqrestore(&info->lock,flags);
1915
1916         netif_wake_queue(dev);
1917 }
1918
1919 /**
1920  * called by device driver when transmit completes
1921  * reenable network layer transmit if stopped
1922  *
1923  * info  pointer to device instance information
1924  */
1925 static void hdlcdev_tx_done(SLMP_INFO *info)
1926 {
1927         if (netif_queue_stopped(info->netdev))
1928                 netif_wake_queue(info->netdev);
1929 }
1930
1931 /**
1932  * called by device driver when frame received
1933  * pass frame to network layer
1934  *
1935  * info  pointer to device instance information
1936  * buf   pointer to buffer contianing frame data
1937  * size  count of data bytes in buf
1938  */
1939 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1940 {
1941         struct sk_buff *skb = dev_alloc_skb(size);
1942         struct net_device *dev = info->netdev;
1943         struct net_device_stats *stats = hdlc_stats(dev);
1944
1945         if (debug_level >= DEBUG_LEVEL_INFO)
1946                 printk("hdlcdev_rx(%s)\n",dev->name);
1947
1948         if (skb == NULL) {
1949                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
1950                 stats->rx_dropped++;
1951                 return;
1952         }
1953
1954         memcpy(skb_put(skb, size),buf,size);
1955
1956         skb->protocol = hdlc_type_trans(skb, info->netdev);
1957
1958         stats->rx_packets++;
1959         stats->rx_bytes += size;
1960
1961         netif_rx(skb);
1962
1963         info->netdev->last_rx = jiffies;
1964 }
1965
1966 /**
1967  * called by device driver when adding device instance
1968  * do generic HDLC initialization
1969  *
1970  * info  pointer to device instance information
1971  *
1972  * returns 0 if success, otherwise error code
1973  */
1974 static int hdlcdev_init(SLMP_INFO *info)
1975 {
1976         int rc;
1977         struct net_device *dev;
1978         hdlc_device *hdlc;
1979
1980         /* allocate and initialize network and HDLC layer objects */
1981
1982         if (!(dev = alloc_hdlcdev(info))) {
1983                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1984                 return -ENOMEM;
1985         }
1986
1987         /* for network layer reporting purposes only */
1988         dev->mem_start = info->phys_sca_base;
1989         dev->mem_end   = info->phys_sca_base + SCA_BASE_SIZE - 1;
1990         dev->irq       = info->irq_level;
1991
1992         /* network layer callbacks and settings */
1993         dev->do_ioctl       = hdlcdev_ioctl;
1994         dev->open           = hdlcdev_open;
1995         dev->stop           = hdlcdev_close;
1996         dev->tx_timeout     = hdlcdev_tx_timeout;
1997         dev->watchdog_timeo = 10*HZ;
1998         dev->tx_queue_len   = 50;
1999
2000         /* generic HDLC layer callbacks and settings */
2001         hdlc         = dev_to_hdlc(dev);
2002         hdlc->attach = hdlcdev_attach;
2003         hdlc->xmit   = hdlcdev_xmit;
2004
2005         /* register objects with HDLC layer */
2006         if ((rc = register_hdlc_device(dev))) {
2007                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
2008                 free_netdev(dev);
2009                 return rc;
2010         }
2011
2012         info->netdev = dev;
2013         return 0;
2014 }
2015
2016 /**
2017  * called by device driver when removing device instance
2018  * do generic HDLC cleanup
2019  *
2020  * info  pointer to device instance information
2021  */
2022 static void hdlcdev_exit(SLMP_INFO *info)
2023 {
2024         unregister_hdlc_device(info->netdev);
2025         free_netdev(info->netdev);
2026         info->netdev = NULL;
2027 }
2028
2029 #endif /* CONFIG_HDLC */
2030
2031
2032 /* Return next bottom half action to perform.
2033  * Return Value:        BH action code or 0 if nothing to do.
2034  */
2035 int bh_action(SLMP_INFO *info)
2036 {
2037         unsigned long flags;
2038         int rc = 0;
2039
2040         spin_lock_irqsave(&info->lock,flags);
2041
2042         if (info->pending_bh & BH_RECEIVE) {
2043                 info->pending_bh &= ~BH_RECEIVE;
2044                 rc = BH_RECEIVE;
2045         } else if (info->pending_bh & BH_TRANSMIT) {
2046                 info->pending_bh &= ~BH_TRANSMIT;
2047                 rc = BH_TRANSMIT;
2048         } else if (info->pending_bh & BH_STATUS) {
2049                 info->pending_bh &= ~BH_STATUS;
2050                 rc = BH_STATUS;
2051         }
2052
2053         if (!rc) {
2054                 /* Mark BH routine as complete */
2055                 info->bh_running   = 0;
2056                 info->bh_requested = 0;
2057         }
2058
2059         spin_unlock_irqrestore(&info->lock,flags);
2060
2061         return rc;
2062 }
2063
2064 /* Perform bottom half processing of work items queued by ISR.
2065  */
2066 void bh_handler(void* Context)
2067 {
2068         SLMP_INFO *info = (SLMP_INFO*)Context;
2069         int action;
2070
2071         if (!info)
2072                 return;
2073
2074         if ( debug_level >= DEBUG_LEVEL_BH )
2075                 printk( "%s(%d):%s bh_handler() entry\n",
2076                         __FILE__,__LINE__,info->device_name);
2077
2078         info->bh_running = 1;
2079
2080         while((action = bh_action(info)) != 0) {
2081
2082                 /* Process work item */
2083                 if ( debug_level >= DEBUG_LEVEL_BH )
2084                         printk( "%s(%d):%s bh_handler() work item action=%d\n",
2085                                 __FILE__,__LINE__,info->device_name, action);
2086
2087                 switch (action) {
2088
2089                 case BH_RECEIVE:
2090                         bh_receive(info);
2091                         break;
2092                 case BH_TRANSMIT:
2093                         bh_transmit(info);
2094                         break;
2095                 case BH_STATUS:
2096                         bh_status(info);
2097                         break;
2098                 default:
2099                         /* unknown work item ID */
2100                         printk("%s(%d):%s Unknown work item ID=%08X!\n",
2101                                 __FILE__,__LINE__,info->device_name,action);
2102                         break;
2103                 }
2104         }
2105
2106         if ( debug_level >= DEBUG_LEVEL_BH )
2107                 printk( "%s(%d):%s bh_handler() exit\n",
2108                         __FILE__,__LINE__,info->device_name);
2109 }
2110
2111 void bh_receive(SLMP_INFO *info)
2112 {
2113         if ( debug_level >= DEBUG_LEVEL_BH )
2114                 printk( "%s(%d):%s bh_receive()\n",
2115                         __FILE__,__LINE__,info->device_name);
2116
2117         while( rx_get_frame(info) );
2118 }
2119
2120 void bh_transmit(SLMP_INFO *info)
2121 {
2122         struct tty_struct *tty = info->tty;
2123
2124         if ( debug_level >= DEBUG_LEVEL_BH )
2125                 printk( "%s(%d):%s bh_transmit() entry\n",
2126                         __FILE__,__LINE__,info->device_name);
2127
2128         if (tty) {
2129                 tty_wakeup(tty);
2130                 wake_up_interruptible(&tty->write_wait);
2131         }
2132 }
2133
2134 void bh_status(SLMP_INFO *info)
2135 {
2136         if ( debug_level >= DEBUG_LEVEL_BH )
2137                 printk( "%s(%d):%s bh_status() entry\n",
2138                         __FILE__,__LINE__,info->device_name);
2139
2140         info->ri_chkcount = 0;
2141         info->dsr_chkcount = 0;
2142         info->dcd_chkcount = 0;
2143         info->cts_chkcount = 0;
2144 }
2145
2146 void isr_timer(SLMP_INFO * info)
2147 {
2148         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2149
2150         /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2151         write_reg(info, IER2, 0);
2152
2153         /* TMCS, Timer Control/Status Register
2154          *
2155          * 07      CMF, Compare match flag (read only) 1=match
2156          * 06      ECMI, CMF Interrupt Enable: 0=disabled
2157          * 05      Reserved, must be 0
2158          * 04      TME, Timer Enable
2159          * 03..00  Reserved, must be 0
2160          *
2161          * 0000 0000
2162          */
2163         write_reg(info, (unsigned char)(timer + TMCS), 0);
2164
2165         info->irq_occurred = TRUE;
2166
2167         if ( debug_level >= DEBUG_LEVEL_ISR )
2168                 printk("%s(%d):%s isr_timer()\n",
2169                         __FILE__,__LINE__,info->device_name);
2170 }
2171
2172 void isr_rxint(SLMP_INFO * info)
2173 {
2174         struct tty_struct *tty = info->tty;
2175         struct  mgsl_icount *icount = &info->icount;
2176         unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2177         unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2178
2179         /* clear status bits */
2180         if (status)
2181                 write_reg(info, SR1, status);
2182
2183         if (status2)
2184                 write_reg(info, SR2, status2);
2185
2186         if ( debug_level >= DEBUG_LEVEL_ISR )
2187                 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2188                         __FILE__,__LINE__,info->device_name,status,status2);
2189
2190         if (info->params.mode == MGSL_MODE_ASYNC) {
2191                 if (status & BRKD) {
2192                         icount->brk++;
2193
2194                         /* process break detection if tty control
2195                          * is not set to ignore it
2196                          */
2197                         if ( tty ) {
2198                                 if (!(status & info->ignore_status_mask1)) {
2199                                         if (info->read_status_mask1 & BRKD) {
2200                                                 *tty->flip.flag_buf_ptr = TTY_BREAK;
2201                                                 if (info->flags & ASYNC_SAK)
2202                                                         do_SAK(tty);
2203                                         }
2204                                 }
2205                         }
2206                 }
2207         }
2208         else {
2209                 if (status & (FLGD|IDLD)) {
2210                         if (status & FLGD)
2211                                 info->icount.exithunt++;
2212                         else if (status & IDLD)
2213                                 info->icount.rxidle++;
2214                         wake_up_interruptible(&info->event_wait_q);
2215                 }
2216         }
2217
2218         if (status & CDCD) {
2219                 /* simulate a common modem status change interrupt
2220                  * for our handler
2221                  */
2222                 get_signals( info );
2223                 isr_io_pin(info,
2224                         MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2225         }
2226 }
2227
2228 /*
2229  * handle async rx data interrupts
2230  */
2231 void isr_rxrdy(SLMP_INFO * info)
2232 {
2233         u16 status;
2234         unsigned char DataByte;
2235         struct tty_struct *tty = info->tty;
2236         struct  mgsl_icount *icount = &info->icount;
2237
2238         if ( debug_level >= DEBUG_LEVEL_ISR )
2239                 printk("%s(%d):%s isr_rxrdy\n",
2240                         __FILE__,__LINE__,info->device_name);
2241
2242         while((status = read_reg(info,CST0)) & BIT0)
2243         {
2244                 DataByte = read_reg(info,TRB);
2245
2246                 if ( tty ) {
2247                         if (tty->flip.count >= TTY_FLIPBUF_SIZE)
2248                                 continue;
2249
2250                         *tty->flip.char_buf_ptr = DataByte;
2251                         *tty->flip.flag_buf_ptr = 0;
2252                 }
2253
2254                 icount->rx++;
2255
2256                 if ( status & (PE + FRME + OVRN) ) {
2257                         printk("%s(%d):%s rxerr=%04X\n",
2258                                 __FILE__,__LINE__,info->device_name,status);
2259
2260                         /* update error statistics */
2261                         if (status & PE)
2262                                 icount->parity++;
2263                         else if (status & FRME)
2264                                 icount->frame++;
2265                         else if (status & OVRN)
2266                                 icount->overrun++;
2267
2268                         /* discard char if tty control flags say so */
2269                         if (status & info->ignore_status_mask2)
2270                                 continue;
2271
2272                         status &= info->read_status_mask2;
2273
2274                         if ( tty ) {
2275                                 if (status & PE)
2276                                         *tty->flip.flag_buf_ptr = TTY_PARITY;
2277                                 else if (status & FRME)
2278                                         *tty->flip.flag_buf_ptr = TTY_FRAME;
2279                                 if (status & OVRN) {
2280                                         /* Overrun is special, since it's
2281                                          * reported immediately, and doesn't
2282                                          * affect the current character
2283                                          */
2284                                         if (tty->flip.count < TTY_FLIPBUF_SIZE) {
2285                                                 tty->flip.count++;
2286                                                 tty->flip.flag_buf_ptr++;
2287                                                 tty->flip.char_buf_ptr++;
2288                                                 *tty->flip.flag_buf_ptr = TTY_OVERRUN;
2289                                         }
2290                                 }
2291                         }
2292                 }       /* end of if (error) */
2293
2294                 if ( tty ) {
2295                         tty->flip.flag_buf_ptr++;
2296                         tty->flip.char_buf_ptr++;
2297                         tty->flip.count++;
2298                 }
2299         }
2300
2301         if ( debug_level >= DEBUG_LEVEL_ISR ) {
2302                 printk("%s(%d):%s isr_rxrdy() flip count=%d\n",
2303                         __FILE__,__LINE__,info->device_name,
2304                         tty ? tty->flip.count : 0);
2305                 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2306                         __FILE__,__LINE__,info->device_name,
2307                         icount->rx,icount->brk,icount->parity,
2308                         icount->frame,icount->overrun);
2309         }
2310
2311         if ( tty && tty->flip.count )
2312                 tty_flip_buffer_push(tty);
2313 }
2314
2315 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2316 {
2317         if ( debug_level >= DEBUG_LEVEL_ISR )
2318                 printk("%s(%d):%s isr_txeom status=%02x\n",
2319                         __FILE__,__LINE__,info->device_name,status);
2320
2321         write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2322         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2323         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2324
2325         if (status & UDRN) {
2326                 write_reg(info, CMD, TXRESET);
2327                 write_reg(info, CMD, TXENABLE);
2328         } else
2329                 write_reg(info, CMD, TXBUFCLR);
2330
2331         /* disable and clear tx interrupts */
2332         info->ie0_value &= ~TXRDYE;
2333         info->ie1_value &= ~(IDLE + UDRN);
2334         write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2335         write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2336
2337         if ( info->tx_active ) {
2338                 if (info->params.mode != MGSL_MODE_ASYNC) {
2339                         if (status & UDRN)
2340                                 info->icount.txunder++;
2341                         else if (status & IDLE)
2342                                 info->icount.txok++;
2343                 }
2344
2345                 info->tx_active = 0;
2346                 info->tx_count = info->tx_put = info->tx_get = 0;
2347
2348                 del_timer(&info->tx_timer);
2349
2350                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2351                         info->serial_signals &= ~SerialSignal_RTS;
2352                         info->drop_rts_on_tx_done = 0;
2353                         set_signals(info);
2354                 }
2355
2356 #ifdef CONFIG_HDLC
2357                 if (info->netcount)
2358                         hdlcdev_tx_done(info);
2359                 else
2360 #endif
2361                 {
2362                         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2363                                 tx_stop(info);
2364                                 return;
2365                         }
2366                         info->pending_bh |= BH_TRANSMIT;
2367                 }
2368         }
2369 }
2370
2371
2372 /*
2373  * handle tx status interrupts
2374  */
2375 void isr_txint(SLMP_INFO * info)
2376 {
2377         unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2378
2379         /* clear status bits */
2380         write_reg(info, SR1, status);
2381
2382         if ( debug_level >= DEBUG_LEVEL_ISR )
2383                 printk("%s(%d):%s isr_txint status=%02x\n",
2384                         __FILE__,__LINE__,info->device_name,status);
2385
2386         if (status & (UDRN + IDLE))
2387                 isr_txeom(info, status);
2388
2389         if (status & CCTS) {
2390                 /* simulate a common modem status change interrupt
2391                  * for our handler
2392                  */
2393                 get_signals( info );
2394                 isr_io_pin(info,
2395                         MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2396
2397         }
2398 }
2399
2400 /*
2401  * handle async tx data interrupts
2402  */
2403 void isr_txrdy(SLMP_INFO * info)
2404 {
2405         if ( debug_level >= DEBUG_LEVEL_ISR )
2406                 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2407                         __FILE__,__LINE__,info->device_name,info->tx_count);
2408
2409         if (info->params.mode != MGSL_MODE_ASYNC) {
2410                 /* disable TXRDY IRQ, enable IDLE IRQ */
2411                 info->ie0_value &= ~TXRDYE;
2412                 info->ie1_value |= IDLE;
2413                 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2414                 return;
2415         }
2416
2417         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2418                 tx_stop(info);
2419                 return;
2420         }
2421
2422         if ( info->tx_count )
2423                 tx_load_fifo( info );
2424         else {
2425                 info->tx_active = 0;
2426                 info->ie0_value &= ~TXRDYE;
2427                 write_reg(info, IE0, info->ie0_value);
2428         }
2429
2430         if (info->tx_count < WAKEUP_CHARS)
2431                 info->pending_bh |= BH_TRANSMIT;
2432 }
2433
2434 void isr_rxdmaok(SLMP_INFO * info)
2435 {
2436         /* BIT7 = EOT (end of transfer)
2437          * BIT6 = EOM (end of message/frame)
2438          */
2439         unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2440
2441         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2442         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2443
2444         if ( debug_level >= DEBUG_LEVEL_ISR )
2445                 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2446                         __FILE__,__LINE__,info->device_name,status);
2447
2448         info->pending_bh |= BH_RECEIVE;
2449 }
2450
2451 void isr_rxdmaerror(SLMP_INFO * info)
2452 {
2453         /* BIT5 = BOF (buffer overflow)
2454          * BIT4 = COF (counter overflow)
2455          */
2456         unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2457
2458         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2459         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2460
2461         if ( debug_level >= DEBUG_LEVEL_ISR )
2462                 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2463                         __FILE__,__LINE__,info->device_name,status);
2464
2465         info->rx_overflow = TRUE;
2466         info->pending_bh |= BH_RECEIVE;
2467 }
2468
2469 void isr_txdmaok(SLMP_INFO * info)
2470 {
2471         unsigned char status_reg1 = read_reg(info, SR1);
2472
2473         write_reg(info, TXDMA + DIR, 0x00);     /* disable Tx DMA IRQs */
2474         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2475         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2476
2477         if ( debug_level >= DEBUG_LEVEL_ISR )
2478                 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2479                         __FILE__,__LINE__,info->device_name,status_reg1);
2480
2481         /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2482         write_reg16(info, TRC0, 0);
2483         info->ie0_value |= TXRDYE;
2484         write_reg(info, IE0, info->ie0_value);
2485 }
2486
2487 void isr_txdmaerror(SLMP_INFO * info)
2488 {
2489         /* BIT5 = BOF (buffer overflow)
2490          * BIT4 = COF (counter overflow)
2491          */
2492         unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2493
2494         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2495         write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2496
2497         if ( debug_level >= DEBUG_LEVEL_ISR )
2498                 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2499                         __FILE__,__LINE__,info->device_name,status);
2500 }
2501
2502 /* handle input serial signal changes
2503  */
2504 void isr_io_pin( SLMP_INFO *info, u16 status )
2505 {
2506         struct  mgsl_icount *icount;
2507
2508         if ( debug_level >= DEBUG_LEVEL_ISR )
2509                 printk("%s(%d):isr_io_pin status=%04X\n",
2510                         __FILE__,__LINE__,status);
2511
2512         if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2513                       MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2514                 icount = &info->icount;
2515                 /* update input line counters */
2516                 if (status & MISCSTATUS_RI_LATCHED) {
2517                         icount->rng++;
2518                         if ( status & SerialSignal_RI )
2519                                 info->input_signal_events.ri_up++;
2520                         else
2521                                 info->input_signal_events.ri_down++;
2522                 }
2523                 if (status & MISCSTATUS_DSR_LATCHED) {
2524                         icount->dsr++;
2525                         if ( status & SerialSignal_DSR )
2526                                 info->input_signal_events.dsr_up++;
2527                         else
2528                                 info->input_signal_events.dsr_down++;
2529                 }
2530                 if (status & MISCSTATUS_DCD_LATCHED) {
2531                         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2532                                 info->ie1_value &= ~CDCD;
2533                                 write_reg(info, IE1, info->ie1_value);
2534                         }
2535                         icount->dcd++;
2536                         if (status & SerialSignal_DCD) {
2537                                 info->input_signal_events.dcd_up++;
2538                         } else
2539                                 info->input_signal_events.dcd_down++;
2540 #ifdef CONFIG_HDLC
2541                         if (info->netcount)
2542                                 hdlc_set_carrier(status & SerialSignal_DCD, info->netdev);
2543 #endif
2544                 }
2545                 if (status & MISCSTATUS_CTS_LATCHED)
2546                 {
2547                         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2548                                 info->ie1_value &= ~CCTS;
2549                                 write_reg(info, IE1, info->ie1_value);
2550                         }
2551                         icount->cts++;
2552                         if ( status & SerialSignal_CTS )
2553                                 info->input_signal_events.cts_up++;
2554                         else
2555                                 info->input_signal_events.cts_down++;
2556                 }
2557                 wake_up_interruptible(&info->status_event_wait_q);
2558                 wake_up_interruptible(&info->event_wait_q);
2559
2560                 if ( (info->flags & ASYNC_CHECK_CD) &&
2561                      (status & MISCSTATUS_DCD_LATCHED) ) {
2562                         if ( debug_level >= DEBUG_LEVEL_ISR )
2563                                 printk("%s CD now %s...", info->device_name,
2564                                        (status & SerialSignal_DCD) ? "on" : "off");
2565                         if (status & SerialSignal_DCD)
2566                                 wake_up_interruptible(&info->open_wait);
2567                         else {
2568                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2569                                         printk("doing serial hangup...");
2570                                 if (info->tty)
2571                                         tty_hangup(info->tty);
2572                         }
2573                 }
2574
2575                 if ( (info->flags & ASYNC_CTS_FLOW) &&
2576                      (status & MISCSTATUS_CTS_LATCHED) ) {
2577                         if ( info->tty ) {
2578                                 if (info->tty->hw_stopped) {
2579                                         if (status & SerialSignal_CTS) {
2580                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2581                                                         printk("CTS tx start...");
2582                                                 info->tty->hw_stopped = 0;
2583                                                 tx_start(info);
2584                                                 info->pending_bh |= BH_TRANSMIT;
2585                                                 return;
2586                                         }
2587                                 } else {
2588                                         if (!(status & SerialSignal_CTS)) {
2589                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2590                                                         printk("CTS tx stop...");
2591                                                 info->tty->hw_stopped = 1;
2592                                                 tx_stop(info);
2593                                         }
2594                                 }
2595                         }
2596                 }
2597         }
2598
2599         info->pending_bh |= BH_STATUS;
2600 }
2601
2602 /* Interrupt service routine entry point.
2603  *
2604  * Arguments:
2605  *      irq             interrupt number that caused interrupt
2606  *      dev_id          device ID supplied during interrupt registration
2607  *      regs            interrupted processor context
2608  */
2609 static irqreturn_t synclinkmp_interrupt(int irq, void *dev_id,
2610                                         struct pt_regs *regs)
2611 {
2612         SLMP_INFO * info;
2613         unsigned char status, status0, status1=0;
2614         unsigned char dmastatus, dmastatus0, dmastatus1=0;
2615         unsigned char timerstatus0, timerstatus1=0;
2616         unsigned char shift;
2617         unsigned int i;
2618         unsigned short tmp;
2619
2620         if ( debug_level >= DEBUG_LEVEL_ISR )
2621                 printk("%s(%d): synclinkmp_interrupt(%d)entry.\n",
2622                         __FILE__,__LINE__,irq);
2623
2624         info = (SLMP_INFO *)dev_id;
2625         if (!info)
2626                 return IRQ_NONE;
2627
2628         spin_lock(&info->lock);
2629
2630         for(;;) {
2631
2632                 /* get status for SCA0 (ports 0-1) */
2633                 tmp = read_reg16(info, ISR0);   /* get ISR0 and ISR1 in one read */
2634                 status0 = (unsigned char)tmp;
2635                 dmastatus0 = (unsigned char)(tmp>>8);
2636                 timerstatus0 = read_reg(info, ISR2);
2637
2638                 if ( debug_level >= DEBUG_LEVEL_ISR )
2639                         printk("%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2640                                 __FILE__,__LINE__,info->device_name,
2641                                 status0,dmastatus0,timerstatus0);
2642
2643                 if (info->port_count == 4) {
2644                         /* get status for SCA1 (ports 2-3) */
2645                         tmp = read_reg16(info->port_array[2], ISR0);
2646                         status1 = (unsigned char)tmp;
2647                         dmastatus1 = (unsigned char)(tmp>>8);
2648                         timerstatus1 = read_reg(info->port_array[2], ISR2);
2649
2650                         if ( debug_level >= DEBUG_LEVEL_ISR )
2651                                 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2652                                         __FILE__,__LINE__,info->device_name,
2653                                         status1,dmastatus1,timerstatus1);
2654                 }
2655
2656                 if (!status0 && !dmastatus0 && !timerstatus0 &&
2657                          !status1 && !dmastatus1 && !timerstatus1)
2658                         break;
2659
2660                 for(i=0; i < info->port_count ; i++) {
2661                         if (info->port_array[i] == NULL)
2662                                 continue;
2663                         if (i < 2) {
2664                                 status = status0;
2665                                 dmastatus = dmastatus0;
2666                         } else {
2667                                 status = status1;
2668                                 dmastatus = dmastatus1;
2669                         }
2670
2671                         shift = i & 1 ? 4 :0;
2672
2673                         if (status & BIT0 << shift)
2674                                 isr_rxrdy(info->port_array[i]);
2675                         if (status & BIT1 << shift)
2676                                 isr_txrdy(info->port_array[i]);
2677                         if (status & BIT2 << shift)
2678                                 isr_rxint(info->port_array[i]);
2679                         if (status & BIT3 << shift)
2680                                 isr_txint(info->port_array[i]);
2681
2682                         if (dmastatus & BIT0 << shift)
2683                                 isr_rxdmaerror(info->port_array[i]);
2684                         if (dmastatus & BIT1 << shift)
2685                                 isr_rxdmaok(info->port_array[i]);
2686                         if (dmastatus & BIT2 << shift)
2687                                 isr_txdmaerror(info->port_array[i]);
2688                         if (dmastatus & BIT3 << shift)
2689                                 isr_txdmaok(info->port_array[i]);
2690                 }
2691
2692                 if (timerstatus0 & (BIT5 | BIT4))
2693                         isr_timer(info->port_array[0]);
2694                 if (timerstatus0 & (BIT7 | BIT6))
2695                         isr_timer(info->port_array[1]);
2696                 if (timerstatus1 & (BIT5 | BIT4))
2697                         isr_timer(info->port_array[2]);
2698                 if (timerstatus1 & (BIT7 | BIT6))
2699                         isr_timer(info->port_array[3]);
2700         }
2701
2702         for(i=0; i < info->port_count ; i++) {
2703                 SLMP_INFO * port = info->port_array[i];
2704
2705                 /* Request bottom half processing if there's something
2706                  * for it to do and the bh is not already running.
2707                  *
2708                  * Note: startup adapter diags require interrupts.
2709                  * do not request bottom half processing if the
2710                  * device is not open in a normal mode.
2711                  */
2712                 if ( port && (port->count || port->netcount) &&
2713                      port->pending_bh && !port->bh_running &&
2714                      !port->bh_requested ) {
2715                         if ( debug_level >= DEBUG_LEVEL_ISR )
2716                                 printk("%s(%d):%s queueing bh task.\n",
2717                                         __FILE__,__LINE__,port->device_name);
2718                         schedule_work(&port->task);
2719                         port->bh_requested = 1;
2720                 }
2721         }
2722
2723         spin_unlock(&info->lock);
2724
2725         if ( debug_level >= DEBUG_LEVEL_ISR )
2726                 printk("%s(%d):synclinkmp_interrupt(%d)exit.\n",
2727                         __FILE__,__LINE__,irq);
2728         return IRQ_HANDLED;
2729 }
2730
2731 /* Initialize and start device.
2732  */
2733 static int startup(SLMP_INFO * info)
2734 {
2735         if ( debug_level >= DEBUG_LEVEL_INFO )
2736                 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2737
2738         if (info->flags & ASYNC_INITIALIZED)
2739                 return 0;
2740
2741         if (!info->tx_buf) {
2742                 info->tx_buf = (unsigned char *)kmalloc(info->max_frame_size, GFP_KERNEL);
2743                 if (!info->tx_buf) {
2744                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2745                                 __FILE__,__LINE__,info->device_name);
2746                         return -ENOMEM;
2747                 }
2748         }
2749
2750         info->pending_bh = 0;
2751
2752         memset(&info->icount, 0, sizeof(info->icount));
2753
2754         /* program hardware for current parameters */
2755         reset_port(info);
2756
2757         change_params(info);
2758
2759         info->status_timer.expires = jiffies + msecs_to_jiffies(10);
2760         add_timer(&info->status_timer);
2761
2762         if (info->tty)
2763                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2764
2765         info->flags |= ASYNC_INITIALIZED;
2766
2767         return 0;
2768 }
2769
2770 /* Called by close() and hangup() to shutdown hardware
2771  */
2772 static void shutdown(SLMP_INFO * info)
2773 {
2774         unsigned long flags;
2775
2776         if (!(info->flags & ASYNC_INITIALIZED))
2777                 return;
2778
2779         if (debug_level >= DEBUG_LEVEL_INFO)
2780                 printk("%s(%d):%s synclinkmp_shutdown()\n",
2781                          __FILE__,__LINE__, info->device_name );
2782
2783         /* clear status wait queue because status changes */
2784         /* can't happen after shutting down the hardware */
2785         wake_up_interruptible(&info->status_event_wait_q);
2786         wake_up_interruptible(&info->event_wait_q);
2787
2788         del_timer(&info->tx_timer);
2789         del_timer(&info->status_timer);
2790
2791         kfree(info->tx_buf);
2792         info->tx_buf = NULL;
2793
2794         spin_lock_irqsave(&info->lock,flags);
2795
2796         reset_port(info);
2797
2798         if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
2799                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2800                 set_signals(info);
2801         }
2802
2803         spin_unlock_irqrestore(&info->lock,flags);
2804
2805         if (info->tty)
2806                 set_bit(TTY_IO_ERROR, &info->tty->flags);
2807
2808         info->flags &= ~ASYNC_INITIALIZED;
2809 }
2810
2811 static void program_hw(SLMP_INFO *info)
2812 {
2813         unsigned long flags;
2814
2815         spin_lock_irqsave(&info->lock,flags);
2816
2817         rx_stop(info);
2818         tx_stop(info);
2819
2820         info->tx_count = info->tx_put = info->tx_get = 0;
2821
2822         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2823                 hdlc_mode(info);
2824         else
2825                 async_mode(info);
2826
2827         set_signals(info);
2828
2829         info->dcd_chkcount = 0;
2830         info->cts_chkcount = 0;
2831         info->ri_chkcount = 0;
2832         info->dsr_chkcount = 0;
2833
2834         info->ie1_value |= (CDCD|CCTS);
2835         write_reg(info, IE1, info->ie1_value);
2836
2837         get_signals(info);
2838
2839         if (info->netcount || (info->tty && info->tty->termios->c_cflag & CREAD) )
2840                 rx_start(info);
2841
2842         spin_unlock_irqrestore(&info->lock,flags);
2843 }
2844
2845 /* Reconfigure adapter based on new parameters
2846  */
2847 static void change_params(SLMP_INFO *info)
2848 {
2849         unsigned cflag;
2850         int bits_per_char;
2851
2852         if (!info->tty || !info->tty->termios)
2853                 return;
2854
2855         if (debug_level >= DEBUG_LEVEL_INFO)
2856                 printk("%s(%d):%s change_params()\n",
2857                          __FILE__,__LINE__, info->device_name );
2858
2859         cflag = info->tty->termios->c_cflag;
2860
2861         /* if B0 rate (hangup) specified then negate DTR and RTS */
2862         /* otherwise assert DTR and RTS */
2863         if (cflag & CBAUD)
2864                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2865         else
2866                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2867
2868         /* byte size and parity */
2869
2870         switch (cflag & CSIZE) {
2871               case CS5: info->params.data_bits = 5; break;
2872               case CS6: info->params.data_bits = 6; break;
2873               case CS7: info->params.data_bits = 7; break;
2874               case CS8: info->params.data_bits = 8; break;
2875               /* Never happens, but GCC is too dumb to figure it out */
2876               default:  info->params.data_bits = 7; break;
2877               }
2878
2879         if (cflag & CSTOPB)
2880                 info->params.stop_bits = 2;
2881         else
2882                 info->params.stop_bits = 1;
2883
2884         info->params.parity = ASYNC_PARITY_NONE;
2885         if (cflag & PARENB) {
2886                 if (cflag & PARODD)
2887                         info->params.parity = ASYNC_PARITY_ODD;
2888                 else
2889                         info->params.parity = ASYNC_PARITY_EVEN;
2890 #ifdef CMSPAR
2891                 if (cflag & CMSPAR)
2892                         info->params.parity = ASYNC_PARITY_SPACE;
2893 #endif
2894         }
2895
2896         /* calculate number of jiffies to transmit a full
2897          * FIFO (32 bytes) at specified data rate
2898          */
2899         bits_per_char = info->params.data_bits +
2900                         info->params.stop_bits + 1;
2901
2902         /* if port data rate is set to 460800 or less then
2903          * allow tty settings to override, otherwise keep the
2904          * current data rate.
2905          */
2906         if (info->params.data_rate <= 460800) {
2907                 info->params.data_rate = tty_get_baud_rate(info->tty);
2908         }
2909
2910         if ( info->params.data_rate ) {
2911                 info->timeout = (32*HZ*bits_per_char) /
2912                                 info->params.data_rate;
2913         }
2914         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2915
2916         if (cflag & CRTSCTS)
2917                 info->flags |= ASYNC_CTS_FLOW;
2918         else
2919                 info->flags &= ~ASYNC_CTS_FLOW;
2920
2921         if (cflag & CLOCAL)
2922                 info->flags &= ~ASYNC_CHECK_CD;
2923         else
2924                 info->flags |= ASYNC_CHECK_CD;
2925
2926         /* process tty input control flags */
2927
2928         info->read_status_mask2 = OVRN;
2929         if (I_INPCK(info->tty))
2930                 info->read_status_mask2 |= PE | FRME;
2931         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2932                 info->read_status_mask1 |= BRKD;
2933         if (I_IGNPAR(info->tty))
2934                 info->ignore_status_mask2 |= PE | FRME;
2935         if (I_IGNBRK(info->tty)) {
2936                 info->ignore_status_mask1 |= BRKD;
2937                 /* If ignoring parity and break indicators, ignore
2938                  * overruns too.  (For real raw support).
2939                  */
2940                 if (I_IGNPAR(info->tty))
2941                         info->ignore_status_mask2 |= OVRN;
2942         }
2943
2944         program_hw(info);
2945 }
2946
2947 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2948 {
2949         int err;
2950
2951         if (debug_level >= DEBUG_LEVEL_INFO)
2952                 printk("%s(%d):%s get_params()\n",
2953                          __FILE__,__LINE__, info->device_name);
2954
2955         if (!user_icount) {
2956                 memset(&info->icount, 0, sizeof(info->icount));
2957         } else {
2958                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2959                 if (err)
2960                         return -EFAULT;
2961         }
2962
2963         return 0;
2964 }
2965
2966 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2967 {
2968         int err;
2969         if (debug_level >= DEBUG_LEVEL_INFO)
2970                 printk("%s(%d):%s get_params()\n",
2971                          __FILE__,__LINE__, info->device_name);
2972
2973         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2974         if (err) {
2975                 if ( debug_level >= DEBUG_LEVEL_INFO )
2976                         printk( "%s(%d):%s get_params() user buffer copy failed\n",
2977                                 __FILE__,__LINE__,info->device_name);
2978                 return -EFAULT;
2979         }
2980
2981         return 0;
2982 }
2983
2984 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2985 {
2986         unsigned long flags;
2987         MGSL_PARAMS tmp_params;
2988         int err;
2989
2990         if (debug_level >= DEBUG_LEVEL_INFO)
2991                 printk("%s(%d):%s set_params\n",
2992                         __FILE__,__LINE__,info->device_name );
2993         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2994         if (err) {
2995                 if ( debug_level >= DEBUG_LEVEL_INFO )
2996                         printk( "%s(%d):%s set_params() user buffer copy failed\n",
2997                                 __FILE__,__LINE__,info->device_name);
2998                 return -EFAULT;
2999         }
3000
3001         spin_lock_irqsave(&info->lock,flags);
3002         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
3003         spin_unlock_irqrestore(&info->lock,flags);
3004
3005         change_params(info);
3006
3007         return 0;
3008 }
3009
3010 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
3011 {
3012         int err;
3013
3014         if (debug_level >= DEBUG_LEVEL_INFO)
3015                 printk("%s(%d):%s get_txidle()=%d\n",
3016                          __FILE__,__LINE__, info->device_name, info->idle_mode);
3017
3018         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
3019         if (err) {
3020                 if ( debug_level >= DEBUG_LEVEL_INFO )
3021                         printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
3022                                 __FILE__,__LINE__,info->device_name);
3023                 return -EFAULT;
3024         }
3025
3026         return 0;
3027 }
3028
3029 static int set_txidle(SLMP_INFO * info, int idle_mode)
3030 {
3031         unsigned long flags;
3032
3033         if (debug_level >= DEBUG_LEVEL_INFO)
3034                 printk("%s(%d):%s set_txidle(%d)\n",
3035                         __FILE__,__LINE__,info->device_name, idle_mode );
3036
3037         spin_lock_irqsave(&info->lock,flags);
3038         info->idle_mode = idle_mode;
3039         tx_set_idle( info );
3040         spin_unlock_irqrestore(&info->lock,flags);
3041         return 0;
3042 }
3043
3044 static int tx_enable(SLMP_INFO * info, int enable)
3045 {
3046         unsigned long flags;
3047
3048         if (debug_level >= DEBUG_LEVEL_INFO)
3049                 printk("%s(%d):%s tx_enable(%d)\n",
3050                         __FILE__,__LINE__,info->device_name, enable);
3051
3052         spin_lock_irqsave(&info->lock,flags);
3053         if ( enable ) {
3054                 if ( !info->tx_enabled ) {
3055                         tx_start(info);
3056                 }
3057         } else {
3058                 if ( info->tx_enabled )
3059                         tx_stop(info);
3060         }
3061         spin_unlock_irqrestore(&info->lock,flags);
3062         return 0;
3063 }
3064
3065 /* abort send HDLC frame
3066  */
3067 static int tx_abort(SLMP_INFO * info)
3068 {
3069         unsigned long flags;
3070
3071         if (debug_level >= DEBUG_LEVEL_INFO)
3072                 printk("%s(%d):%s tx_abort()\n",
3073                         __FILE__,__LINE__,info->device_name);
3074
3075         spin_lock_irqsave(&info->lock,flags);
3076         if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
3077                 info->ie1_value &= ~UDRN;
3078                 info->ie1_value |= IDLE;
3079                 write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
3080                 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
3081
3082                 write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
3083                 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
3084
3085                 write_reg(info, CMD, TXABORT);
3086         }
3087         spin_unlock_irqrestore(&info->lock,flags);
3088         return 0;
3089 }
3090
3091 static int rx_enable(SLMP_INFO * info, int enable)
3092 {
3093         unsigned long flags;
3094
3095         if (debug_level >= DEBUG_LEVEL_INFO)
3096                 printk("%s(%d):%s rx_enable(%d)\n",
3097                         __FILE__,__LINE__,info->device_name,enable);
3098
3099         spin_lock_irqsave(&info->lock,flags);
3100         if ( enable ) {
3101                 if ( !info->rx_enabled )
3102                         rx_start(info);
3103         } else {
3104                 if ( info->rx_enabled )
3105                         rx_stop(info);
3106         }
3107         spin_unlock_irqrestore(&info->lock,flags);
3108         return 0;
3109 }
3110
3111 /* wait for specified event to occur
3112  */
3113 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3114 {
3115         unsigned long flags;
3116         int s;
3117         int rc=0;
3118         struct mgsl_icount cprev, cnow;
3119         int events;
3120         int mask;
3121         struct  _input_signal_events oldsigs, newsigs;
3122         DECLARE_WAITQUEUE(wait, current);
3123
3124         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3125         if (rc) {
3126                 return  -EFAULT;
3127         }
3128
3129         if (debug_level >= DEBUG_LEVEL_INFO)
3130                 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3131                         __FILE__,__LINE__,info->device_name,mask);
3132
3133         spin_lock_irqsave(&info->lock,flags);
3134
3135         /* return immediately if state matches requested events */
3136         get_signals(info);
3137         s = info->serial_signals;
3138
3139         events = mask &
3140                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3141                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3142                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3143                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3144         if (events) {
3145                 spin_unlock_irqrestore(&info->lock,flags);
3146                 goto exit;
3147         }
3148
3149         /* save current irq counts */
3150         cprev = info->icount;
3151         oldsigs = info->input_signal_events;
3152
3153         /* enable hunt and idle irqs if needed */
3154         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3155                 unsigned char oldval = info->ie1_value;
3156                 unsigned char newval = oldval +
3157                          (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3158                          (mask & MgslEvent_IdleReceived ? IDLD:0);
3159                 if ( oldval != newval ) {
3160                         info->ie1_value = newval;
3161                         write_reg(info, IE1, info->ie1_value);
3162                 }
3163         }
3164
3165         set_current_state(TASK_INTERRUPTIBLE);
3166         add_wait_queue(&info->event_wait_q, &wait);
3167
3168         spin_unlock_irqrestore(&info->lock,flags);
3169
3170         for(;;) {
3171                 schedule();
3172                 if (signal_pending(current)) {
3173                         rc = -ERESTARTSYS;
3174                         break;
3175                 }
3176
3177                 /* get current irq counts */
3178                 spin_lock_irqsave(&info->lock,flags);
3179                 cnow = info->icount;
3180                 newsigs = info->input_signal_events;
3181                 set_current_state(TASK_INTERRUPTIBLE);
3182                 spin_unlock_irqrestore(&info->lock,flags);
3183
3184                 /* if no change, wait aborted for some reason */
3185                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
3186                     newsigs.dsr_down == oldsigs.dsr_down &&
3187                     newsigs.dcd_up   == oldsigs.dcd_up   &&
3188                     newsigs.dcd_down == oldsigs.dcd_down &&
3189                     newsigs.cts_up   == oldsigs.cts_up   &&
3190                     newsigs.cts_down == oldsigs.cts_down &&
3191                     newsigs.ri_up    == oldsigs.ri_up    &&
3192                     newsigs.ri_down  == oldsigs.ri_down  &&
3193                     cnow.exithunt    == cprev.exithunt   &&
3194                     cnow.rxidle      == cprev.rxidle) {
3195                         rc = -EIO;
3196                         break;
3197                 }
3198
3199                 events = mask &
3200                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
3201                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3202                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
3203                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3204                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
3205                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3206                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
3207                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
3208                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
3209                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
3210                 if (events)
3211                         break;
3212
3213                 cprev = cnow;
3214                 oldsigs = newsigs;
3215         }
3216
3217         remove_wait_queue(&info->event_wait_q, &wait);
3218         set_current_state(TASK_RUNNING);
3219
3220
3221         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3222                 spin_lock_irqsave(&info->lock,flags);
3223                 if (!waitqueue_active(&info->event_wait_q)) {
3224                         /* disable enable exit hunt mode/idle rcvd IRQs */
3225                         info->ie1_value &= ~(FLGD|IDLD);
3226                         write_reg(info, IE1, info->ie1_value);
3227                 }
3228                 spin_unlock_irqrestore(&info->lock,flags);
3229         }
3230 exit:
3231         if ( rc == 0 )
3232                 PUT_USER(rc, events, mask_ptr);
3233
3234         return rc;
3235 }
3236
3237 static int modem_input_wait(SLMP_INFO *info,int arg)
3238 {
3239         unsigned long flags;
3240         int rc;
3241         struct mgsl_icount cprev, cnow;
3242         DECLARE_WAITQUEUE(wait, current);
3243
3244         /* save current irq counts */
3245         spin_lock_irqsave(&info->lock,flags);
3246         cprev = info->icount;
3247         add_wait_queue(&info->status_event_wait_q, &wait);
3248         set_current_state(TASK_INTERRUPTIBLE);
3249         spin_unlock_irqrestore(&info->lock,flags);
3250
3251         for(;;) {
3252                 schedule();
3253                 if (signal_pending(current)) {
3254                         rc = -ERESTARTSYS;
3255                         break;
3256                 }
3257
3258                 /* get new irq counts */
3259                 spin_lock_irqsave(&info->lock,flags);
3260                 cnow = info->icount;
3261                 set_current_state(TASK_INTERRUPTIBLE);
3262                 spin_unlock_irqrestore(&info->lock,flags);
3263
3264                 /* if no change, wait aborted for some reason */
3265                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3266                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3267                         rc = -EIO;
3268                         break;
3269                 }
3270
3271                 /* check for change in caller specified modem input */
3272                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3273                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3274                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3275                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3276                         rc = 0;
3277                         break;
3278                 }
3279
3280                 cprev = cnow;
3281         }
3282         remove_wait_queue(&info->status_event_wait_q, &wait);
3283         set_current_state(TASK_RUNNING);
3284         return rc;
3285 }
3286
3287 /* return the state of the serial control and status signals
3288  */
3289 static int tiocmget(struct tty_struct *tty, struct file *file)
3290 {
3291         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3292         unsigned int result;
3293         unsigned long flags;
3294
3295         spin_lock_irqsave(&info->lock,flags);
3296         get_signals(info);
3297         spin_unlock_irqrestore(&info->lock,flags);
3298
3299         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3300                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3301                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3302                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
3303                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3304                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3305
3306         if (debug_level >= DEBUG_LEVEL_INFO)
3307                 printk("%s(%d):%s tiocmget() value=%08X\n",
3308                          __FILE__,__LINE__, info->device_name, result );
3309         return result;
3310 }
3311
3312 /* set modem control signals (DTR/RTS)
3313  */
3314 static int tiocmset(struct tty_struct *tty, struct file *file,
3315                     unsigned int set, unsigned int clear)
3316 {
3317         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3318         unsigned long flags;
3319
3320         if (debug_level >= DEBUG_LEVEL_INFO)
3321                 printk("%s(%d):%s tiocmset(%x,%x)\n",
3322                         __FILE__,__LINE__,info->device_name, set, clear);
3323
3324         if (set & TIOCM_RTS)
3325                 info->serial_signals |= SerialSignal_RTS;
3326         if (set & TIOCM_DTR)
3327                 info->serial_signals |= SerialSignal_DTR;
3328         if (clear & TIOCM_RTS)
3329                 info->serial_signals &= ~SerialSignal_RTS;
3330         if (clear & TIOCM_DTR)
3331                 info->serial_signals &= ~SerialSignal_DTR;
3332
3333         spin_lock_irqsave(&info->lock,flags);
3334         set_signals(info);
3335         spin_unlock_irqrestore(&info->lock,flags);
3336
3337         return 0;
3338 }
3339
3340
3341
3342 /* Block the current process until the specified port is ready to open.
3343  */
3344 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3345                            SLMP_INFO *info)
3346 {
3347         DECLARE_WAITQUEUE(wait, current);
3348         int             retval;
3349         int             do_clocal = 0, extra_count = 0;
3350         unsigned long   flags;
3351
3352         if (debug_level >= DEBUG_LEVEL_INFO)
3353                 printk("%s(%d):%s block_til_ready()\n",
3354                          __FILE__,__LINE__, tty->driver->name );
3355
3356         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3357                 /* nonblock mode is set or port is not enabled */
3358                 /* just verify that callout device is not active */
3359                 info->flags |= ASYNC_NORMAL_ACTIVE;
3360                 return 0;
3361         }
3362
3363         if (tty->termios->c_cflag & CLOCAL)
3364                 do_clocal = 1;
3365
3366         /* Wait for carrier detect and the line to become
3367          * free (i.e., not in use by the callout).  While we are in
3368          * this loop, info->count is dropped by one, so that
3369          * close() knows when to free things.  We restore it upon
3370          * exit, either normal or abnormal.
3371          */
3372
3373         retval = 0;
3374         add_wait_queue(&info->open_wait, &wait);
3375
3376         if (debug_level >= DEBUG_LEVEL_INFO)
3377                 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3378                          __FILE__,__LINE__, tty->driver->name, info->count );
3379
3380         spin_lock_irqsave(&info->lock, flags);
3381         if (!tty_hung_up_p(filp)) {
3382                 extra_count = 1;
3383                 info->count--;
3384         }
3385         spin_unlock_irqrestore(&info->lock, flags);
3386         info->blocked_open++;
3387
3388         while (1) {
3389                 if ((tty->termios->c_cflag & CBAUD)) {
3390                         spin_lock_irqsave(&info->lock,flags);
3391                         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3392                         set_signals(info);
3393                         spin_unlock_irqrestore(&info->lock,flags);
3394                 }
3395
3396                 set_current_state(TASK_INTERRUPTIBLE);
3397
3398                 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
3399                         retval = (info->flags & ASYNC_HUP_NOTIFY) ?
3400                                         -EAGAIN : -ERESTARTSYS;
3401                         break;
3402                 }
3403
3404                 spin_lock_irqsave(&info->lock,flags);
3405                 get_signals(info);
3406                 spin_unlock_irqrestore(&info->lock,flags);
3407
3408                 if (!(info->flags & ASYNC_CLOSING) &&
3409                     (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
3410                         break;
3411                 }
3412
3413                 if (signal_pending(current)) {
3414                         retval = -ERESTARTSYS;
3415                         break;
3416                 }
3417
3418                 if (debug_level >= DEBUG_LEVEL_INFO)
3419                         printk("%s(%d):%s block_til_ready() count=%d\n",
3420                                  __FILE__,__LINE__, tty->driver->name, info->count );
3421
3422                 schedule();
3423         }
3424
3425         set_current_state(TASK_RUNNING);
3426         remove_wait_queue(&info->open_wait, &wait);
3427
3428         if (extra_count)
3429                 info->count++;
3430         info->blocked_open--;
3431
3432         if (debug_level >= DEBUG_LEVEL_INFO)
3433                 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3434                          __FILE__,__LINE__, tty->driver->name, info->count );
3435
3436         if (!retval)
3437                 info->flags |= ASYNC_NORMAL_ACTIVE;
3438
3439         return retval;
3440 }
3441
3442 int alloc_dma_bufs(SLMP_INFO *info)
3443 {
3444         unsigned short BuffersPerFrame;
3445         unsigned short BufferCount;
3446
3447         // Force allocation to start at 64K boundary for each port.
3448         // This is necessary because *all* buffer descriptors for a port
3449         // *must* be in the same 64K block. All descriptors on a port
3450         // share a common 'base' address (upper 8 bits of 24 bits) programmed
3451         // into the CBP register.
3452         info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3453
3454         /* Calculate the number of DMA buffers necessary to hold the */
3455         /* largest allowable frame size. Note: If the max frame size is */
3456         /* not an even multiple of the DMA buffer size then we need to */
3457         /* round the buffer count per frame up one. */
3458
3459         BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3460         if ( info->max_frame_size % SCABUFSIZE )
3461                 BuffersPerFrame++;
3462
3463         /* calculate total number of data buffers (SCABUFSIZE) possible
3464          * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3465          * for the descriptor list (BUFFERLISTSIZE).
3466          */
3467         BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3468
3469         /* limit number of buffers to maximum amount of descriptors */
3470         if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3471                 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3472
3473         /* use enough buffers to transmit one max size frame */
3474         info->tx_buf_count = BuffersPerFrame + 1;
3475
3476         /* never use more than half the available buffers for transmit */
3477         if (info->tx_buf_count > (BufferCount/2))
3478                 info->tx_buf_count = BufferCount/2;
3479
3480         if (info->tx_buf_count > SCAMAXDESC)
3481                 info->tx_buf_count = SCAMAXDESC;
3482
3483         /* use remaining buffers for receive */
3484         info->rx_buf_count = BufferCount - info->tx_buf_count;
3485
3486         if (info->rx_buf_count > SCAMAXDESC)
3487                 info->rx_buf_count = SCAMAXDESC;
3488
3489         if ( debug_level >= DEBUG_LEVEL_INFO )
3490                 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3491                         __FILE__,__LINE__, info->device_name,
3492                         info->tx_buf_count,info->rx_buf_count);
3493
3494         if ( alloc_buf_list( info ) < 0 ||
3495                 alloc_frame_bufs(info,
3496                                         info->rx_buf_list,
3497                                         info->rx_buf_list_ex,
3498                                         info->rx_buf_count) < 0 ||
3499                 alloc_frame_bufs(info,
3500                                         info->tx_buf_list,
3501                                         info->tx_buf_list_ex,
3502                                         info->tx_buf_count) < 0 ||
3503                 alloc_tmp_rx_buf(info) < 0 ) {
3504                 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3505                         __FILE__,__LINE__, info->device_name);
3506                 return -ENOMEM;
3507         }
3508
3509         rx_reset_buffers( info );
3510
3511         return 0;
3512 }
3513
3514 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3515  */
3516 int alloc_buf_list(SLMP_INFO *info)
3517 {
3518         unsigned int i;
3519
3520         /* build list in adapter shared memory */
3521         info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3522         info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3523         info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3524
3525         memset(info->buffer_list, 0, BUFFERLISTSIZE);
3526
3527         /* Save virtual address pointers to the receive and */
3528         /* transmit buffer lists. (Receive 1st). These pointers will */
3529         /* be used by the processor to access the lists. */
3530         info->rx_buf_list = (SCADESC *)info->buffer_list;
3531
3532         info->tx_buf_list = (SCADESC *)info->buffer_list;
3533         info->tx_buf_list += info->rx_buf_count;
3534
3535         /* Build links for circular buffer entry lists (tx and rx)
3536          *
3537          * Note: links are physical addresses read by the SCA device
3538          * to determine the next buffer entry to use.
3539          */
3540
3541         for ( i = 0; i < info->rx_buf_count; i++ ) {
3542                 /* calculate and store physical address of this buffer entry */
3543                 info->rx_buf_list_ex[i].phys_entry =
3544                         info->buffer_list_phys + (i * sizeof(SCABUFSIZE));
3545
3546                 /* calculate and store physical address of */
3547                 /* next entry in cirular list of entries */
3548                 info->rx_buf_list[i].next = info->buffer_list_phys;
3549                 if ( i < info->rx_buf_count - 1 )
3550                         info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3551
3552                 info->rx_buf_list[i].length = SCABUFSIZE;
3553         }
3554
3555         for ( i = 0; i < info->tx_buf_count; i++ ) {
3556                 /* calculate and store physical address of this buffer entry */
3557                 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3558                         ((info->rx_buf_count + i) * sizeof(SCADESC));
3559
3560                 /* calculate and store physical address of */
3561                 /* next entry in cirular list of entries */
3562
3563                 info->tx_buf_list[i].next = info->buffer_list_phys +
3564                         info->rx_buf_count * sizeof(SCADESC);
3565
3566                 if ( i < info->tx_buf_count - 1 )
3567                         info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3568         }
3569
3570         return 0;
3571 }
3572
3573 /* Allocate the frame DMA buffers used by the specified buffer list.
3574  */
3575 int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3576 {
3577         int i;
3578         unsigned long phys_addr;
3579
3580         for ( i = 0; i < count; i++ ) {
3581                 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3582                 phys_addr = info->port_array[0]->last_mem_alloc;
3583                 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3584
3585                 buf_list[i].buf_ptr  = (unsigned short)phys_addr;
3586                 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3587         }
3588
3589         return 0;
3590 }
3591
3592 void free_dma_bufs(SLMP_INFO *info)
3593 {
3594         info->buffer_list = NULL;
3595         info->rx_buf_list = NULL;
3596         info->tx_buf_list = NULL;
3597 }
3598
3599 /* allocate buffer large enough to hold max_frame_size.
3600  * This buffer is used to pass an assembled frame to the line discipline.
3601  */
3602 int alloc_tmp_rx_buf(SLMP_INFO *info)
3603 {
3604         info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3605         if (info->tmp_rx_buf == NULL)
3606                 return -ENOMEM;
3607         return 0;
3608 }
3609
3610 void free_tmp_rx_buf(SLMP_INFO *info)
3611 {
3612         kfree(info->tmp_rx_buf);
3613         info->tmp_rx_buf = NULL;
3614 }
3615
3616 int claim_resources(SLMP_INFO *info)
3617 {
3618         if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3619                 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3620                         __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3621                 info->init_error = DiagStatus_AddressConflict;
3622                 goto errout;
3623         }
3624         else
3625                 info->shared_mem_requested = 1;
3626
3627         if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3628                 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3629                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3630                 info->init_error = DiagStatus_AddressConflict;
3631                 goto errout;
3632         }
3633         else
3634                 info->lcr_mem_requested = 1;
3635
3636         if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3637                 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3638                         __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3639                 info->init_error = DiagStatus_AddressConflict;
3640                 goto errout;
3641         }
3642         else
3643                 info->sca_base_requested = 1;
3644
3645         if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3646                 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3647                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3648                 info->init_error = DiagStatus_AddressConflict;
3649                 goto errout;
3650         }
3651         else
3652                 info->sca_statctrl_requested = 1;
3653
3654         info->memory_base = ioremap(info->phys_memory_base,SCA_MEM_SIZE);
3655         if (!info->memory_base) {
3656                 printk( "%s(%d):%s Cant map shared memory, MemAddr=%08X\n",
3657                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3658                 info->init_error = DiagStatus_CantAssignPciResources;
3659                 goto errout;
3660         }
3661
3662         info->lcr_base = ioremap(info->phys_lcr_base,PAGE_SIZE);
3663         if (!info->lcr_base) {
3664                 printk( "%s(%d):%s Cant map LCR memory, MemAddr=%08X\n",
3665                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3666                 info->init_error = DiagStatus_CantAssignPciResources;
3667                 goto errout;
3668         }
3669         info->lcr_base += info->lcr_offset;
3670
3671         info->sca_base = ioremap(info->phys_sca_base,PAGE_SIZE);
3672         if (!info->sca_base) {
3673                 printk( "%s(%d):%s Cant map SCA memory, MemAddr=%08X\n",
3674                         __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3675                 info->init_error = DiagStatus_CantAssignPciResources;
3676                 goto errout;
3677         }
3678         info->sca_base += info->sca_offset;
3679
3680         info->statctrl_base = ioremap(info->phys_statctrl_base,PAGE_SIZE);
3681         if (!info->statctrl_base) {
3682                 printk( "%s(%d):%s Cant map SCA Status/Control memory, MemAddr=%08X\n",
3683                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3684                 info->init_error = DiagStatus_CantAssignPciResources;
3685                 goto errout;
3686         }
3687         info->statctrl_base += info->statctrl_offset;
3688
3689         if ( !memory_test(info) ) {
3690                 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3691                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3692                 info->init_error = DiagStatus_MemoryError;
3693                 goto errout;
3694         }
3695
3696         return 0;
3697
3698 errout:
3699         release_resources( info );
3700         return -ENODEV;
3701 }
3702
3703 void release_resources(SLMP_INFO *info)
3704 {
3705         if ( debug_level >= DEBUG_LEVEL_INFO )
3706                 printk( "%s(%d):%s release_resources() entry\n",
3707                         __FILE__,__LINE__,info->device_name );
3708
3709         if ( info->irq_requested ) {
3710                 free_irq(info->irq_level, info);
3711                 info->irq_requested = 0;
3712         }
3713
3714         if ( info->shared_mem_requested ) {
3715                 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3716                 info->shared_mem_requested = 0;
3717         }
3718         if ( info->lcr_mem_requested ) {
3719                 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3720                 info->lcr_mem_requested = 0;
3721         }
3722         if ( info->sca_base_requested ) {
3723                 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3724                 info->sca_base_requested = 0;
3725         }
3726         if ( info->sca_statctrl_requested ) {
3727                 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3728                 info->sca_statctrl_requested = 0;
3729         }
3730
3731         if (info->memory_base){
3732                 iounmap(info->memory_base);
3733                 info->memory_base = NULL;
3734         }
3735
3736         if (info->sca_base) {
3737                 iounmap(info->sca_base - info->sca_offset);
3738                 info->sca_base=NULL;
3739         }
3740
3741         if (info->statctrl_base) {
3742                 iounmap(info->statctrl_base - info->statctrl_offset);
3743                 info->statctrl_base=NULL;
3744         }
3745
3746         if (info->lcr_base){
3747                 iounmap(info->lcr_base - info->lcr_offset);
3748                 info->lcr_base = NULL;
3749         }
3750
3751         if ( debug_level >= DEBUG_LEVEL_INFO )
3752                 printk( "%s(%d):%s release_resources() exit\n",
3753                         __FILE__,__LINE__,info->device_name );
3754 }
3755
3756 /* Add the specified device instance data structure to the
3757  * global linked list of devices and increment the device count.
3758  */
3759 void add_device(SLMP_INFO *info)
3760 {
3761         info->next_device = NULL;
3762         info->line = synclinkmp_device_count;
3763         sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3764
3765         if (info->line < MAX_DEVICES) {
3766                 if (maxframe[info->line])
3767                         info->max_frame_size = maxframe[info->line];
3768                 info->dosyncppp = dosyncppp[info->line];
3769         }
3770
3771         synclinkmp_device_count++;
3772
3773         if ( !synclinkmp_device_list )
3774                 synclinkmp_device_list = info;
3775         else {
3776                 SLMP_INFO *current_dev = synclinkmp_device_list;
3777                 while( current_dev->next_device )
3778                         current_dev = current_dev->next_device;
3779                 current_dev->next_device = info;
3780         }
3781
3782         if ( info->max_frame_size < 4096 )
3783                 info->max_frame_size = 4096;
3784         else if ( info->max_frame_size > 65535 )
3785                 info->max_frame_size = 65535;
3786
3787         printk( "SyncLink MultiPort %s: "
3788                 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3789                 info->device_name,
3790                 info->phys_sca_base,
3791                 info->phys_memory_base,
3792                 info->phys_statctrl_base,
3793                 info->phys_lcr_base,
3794                 info->irq_level,
3795                 info->max_frame_size );
3796
3797 #ifdef CONFIG_HDLC
3798         hdlcdev_init(info);
3799 #endif
3800 }
3801
3802 /* Allocate and initialize a device instance structure
3803  *
3804  * Return Value:        pointer to SLMP_INFO if success, otherwise NULL
3805  */
3806 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3807 {
3808         SLMP_INFO *info;
3809
3810         info = (SLMP_INFO *)kmalloc(sizeof(SLMP_INFO),
3811                  GFP_KERNEL);
3812
3813         if (!info) {
3814                 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3815                         __FILE__,__LINE__, adapter_num, port_num);
3816         } else {
3817                 memset(info, 0, sizeof(SLMP_INFO));
3818                 info->magic = MGSL_MAGIC;
3819                 INIT_WORK(&info->task, bh_handler, info);
3820                 info->max_frame_size = 4096;
3821                 info->close_delay = 5*HZ/10;
3822                 info->closing_wait = 30*HZ;
3823                 init_waitqueue_head(&info->open_wait);
3824                 init_waitqueue_head(&info->close_wait);
3825                 init_waitqueue_head(&info->status_event_wait_q);
3826                 init_waitqueue_head(&info->event_wait_q);
3827                 spin_lock_init(&info->netlock);
3828                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3829                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3830                 info->adapter_num = adapter_num;
3831                 info->port_num = port_num;
3832
3833                 /* Copy configuration info to device instance data */
3834                 info->irq_level = pdev->irq;
3835                 info->phys_lcr_base = pci_resource_start(pdev,0);
3836                 info->phys_sca_base = pci_resource_start(pdev,2);
3837                 info->phys_memory_base = pci_resource_start(pdev,3);
3838                 info->phys_statctrl_base = pci_resource_start(pdev,4);
3839
3840                 /* Because veremap only works on page boundaries we must map
3841                  * a larger area than is actually implemented for the LCR
3842                  * memory range. We map a full page starting at the page boundary.
3843                  */
3844                 info->lcr_offset    = info->phys_lcr_base & (PAGE_SIZE-1);
3845                 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3846
3847                 info->sca_offset    = info->phys_sca_base & (PAGE_SIZE-1);
3848                 info->phys_sca_base &= ~(PAGE_SIZE-1);
3849
3850                 info->statctrl_offset    = info->phys_statctrl_base & (PAGE_SIZE-1);
3851                 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3852
3853                 info->bus_type = MGSL_BUS_TYPE_PCI;
3854                 info->irq_flags = SA_SHIRQ;
3855
3856                 init_timer(&info->tx_timer);
3857                 info->tx_timer.data = (unsigned long)info;
3858                 info->tx_timer.function = tx_timeout;
3859
3860                 init_timer(&info->status_timer);
3861                 info->status_timer.data = (unsigned long)info;
3862                 info->status_timer.function = status_timeout;
3863
3864                 /* Store the PCI9050 misc control register value because a flaw
3865                  * in the PCI9050 prevents LCR registers from being read if
3866                  * BIOS assigns an LCR base address with bit 7 set.
3867                  *
3868                  * Only the misc control register is accessed for which only
3869                  * write access is needed, so set an initial value and change
3870                  * bits to the device instance data as we write the value
3871                  * to the actual misc control register.
3872                  */
3873                 info->misc_ctrl_value = 0x087e4546;
3874
3875                 /* initial port state is unknown - if startup errors
3876                  * occur, init_error will be set to indicate the
3877                  * problem. Once the port is fully initialized,
3878                  * this value will be set to 0 to indicate the
3879                  * port is available.
3880                  */
3881                 info->init_error = -1;
3882         }
3883
3884         return info;
3885 }
3886
3887 void device_init(int adapter_num, struct pci_dev *pdev)
3888 {
3889         SLMP_INFO *port_array[SCA_MAX_PORTS];
3890         int port;
3891
3892         /* allocate device instances for up to SCA_MAX_PORTS devices */
3893         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3894                 port_array[port] = alloc_dev(adapter_num,port,pdev);
3895                 if( port_array[port] == NULL ) {
3896                         for ( --port; port >= 0; --port )
3897                                 kfree(port_array[port]);
3898                         return;
3899                 }
3900         }
3901
3902         /* give copy of port_array to all ports and add to device list  */
3903         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3904                 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3905                 add_device( port_array[port] );
3906                 spin_lock_init(&port_array[port]->lock);
3907         }
3908
3909         /* Allocate and claim adapter resources */
3910         if ( !claim_resources(port_array[0]) ) {
3911
3912                 alloc_dma_bufs(port_array[0]);
3913
3914                 /* copy resource information from first port to others */
3915                 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3916                         port_array[port]->lock  = port_array[0]->lock;
3917                         port_array[port]->irq_level     = port_array[0]->irq_level;
3918                         port_array[port]->memory_base   = port_array[0]->memory_base;
3919                         port_array[port]->sca_base      = port_array[0]->sca_base;
3920                         port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3921                         port_array[port]->lcr_base      = port_array[0]->lcr_base;
3922                         alloc_dma_bufs(port_array[port]);
3923                 }
3924
3925                 if ( request_irq(port_array[0]->irq_level,
3926                                         synclinkmp_interrupt,
3927                                         port_array[0]->irq_flags,
3928                                         port_array[0]->device_name,
3929                                         port_array[0]) < 0 ) {
3930                         printk( "%s(%d):%s Cant request interrupt, IRQ=%d\n",
3931                                 __FILE__,__LINE__,
3932                                 port_array[0]->device_name,
3933                                 port_array[0]->irq_level );
3934                 }
3935                 else {
3936                         port_array[0]->irq_requested = 1;
3937                         adapter_test(port_array[0]);
3938                 }
3939         }
3940 }
3941
3942 static struct tty_operations ops = {
3943         .open = open,
3944         .close = close,
3945         .write = write,
3946         .put_char = put_char,
3947         .flush_chars = flush_chars,
3948         .write_room = write_room,
3949         .chars_in_buffer = chars_in_buffer,
3950         .flush_buffer = flush_buffer,
3951         .ioctl = ioctl,
3952         .throttle = throttle,
3953         .unthrottle = unthrottle,
3954         .send_xchar = send_xchar,
3955         .break_ctl = set_break,
3956         .wait_until_sent = wait_until_sent,
3957         .read_proc = read_proc,
3958         .set_termios = set_termios,
3959         .stop = tx_hold,
3960         .start = tx_release,
3961         .hangup = hangup,
3962         .tiocmget = tiocmget,
3963         .tiocmset = tiocmset,
3964 };
3965
3966 static void synclinkmp_cleanup(void)
3967 {
3968         int rc;
3969         SLMP_INFO *info;
3970         SLMP_INFO *tmp;
3971
3972         printk("Unloading %s %s\n", driver_name, driver_version);
3973
3974         if (serial_driver) {
3975                 if ((rc = tty_unregister_driver(serial_driver)))
3976                         printk("%s(%d) failed to unregister tty driver err=%d\n",
3977                                __FILE__,__LINE__,rc);
3978                 put_tty_driver(serial_driver);
3979         }
3980
3981         /* reset devices */
3982         info = synclinkmp_device_list;
3983         while(info) {
3984                 reset_port(info);
3985                 info = info->next_device;
3986         }
3987
3988         /* release devices */
3989         info = synclinkmp_device_list;
3990         while(info) {
3991 #ifdef CONFIG_HDLC
3992                 hdlcdev_exit(info);
3993 #endif
3994                 free_dma_bufs(info);
3995                 free_tmp_rx_buf(info);
3996                 if ( info->port_num == 0 ) {
3997                         if (info->sca_base)
3998                                 write_reg(info, LPR, 1); /* set low power mode */
3999                         release_resources(info);
4000                 }
4001                 tmp = info;
4002                 info = info->next_device;
4003                 kfree(tmp);
4004         }
4005
4006         pci_unregister_driver(&synclinkmp_pci_driver);
4007 }
4008
4009 /* Driver initialization entry point.
4010  */
4011
4012 static int __init synclinkmp_init(void)
4013 {
4014         int rc;
4015
4016         if (break_on_load) {
4017                 synclinkmp_get_text_ptr();
4018                 BREAKPOINT();
4019         }
4020
4021         printk("%s %s\n", driver_name, driver_version);
4022
4023         if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
4024                 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4025                 return rc;
4026         }
4027
4028         serial_driver = alloc_tty_driver(128);
4029         if (!serial_driver) {
4030                 rc = -ENOMEM;
4031                 goto error;
4032         }
4033
4034         /* Initialize the tty_driver structure */
4035
4036         serial_driver->owner = THIS_MODULE;
4037         serial_driver->driver_name = "synclinkmp";
4038         serial_driver->name = "ttySLM";
4039         serial_driver->major = ttymajor;
4040         serial_driver->minor_start = 64;
4041         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4042         serial_driver->subtype = SERIAL_TYPE_NORMAL;
4043         serial_driver->init_termios = tty_std_termios;
4044         serial_driver->init_termios.c_cflag =
4045                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4046         serial_driver->flags = TTY_DRIVER_REAL_RAW;
4047         tty_set_operations(serial_driver, &ops);
4048         if ((rc = tty_register_driver(serial_driver)) < 0) {
4049                 printk("%s(%d):Couldn't register serial driver\n",
4050                         __FILE__,__LINE__);
4051                 put_tty_driver(serial_driver);
4052                 serial_driver = NULL;
4053                 goto error;
4054         }
4055
4056         printk("%s %s, tty major#%d\n",
4057                 driver_name, driver_version,
4058                 serial_driver->major);
4059
4060         return 0;
4061
4062 error:
4063         synclinkmp_cleanup();
4064         return rc;
4065 }
4066
4067 static void __exit synclinkmp_exit(void)
4068 {
4069         synclinkmp_cleanup();
4070 }
4071
4072 module_init(synclinkmp_init);
4073 module_exit(synclinkmp_exit);
4074
4075 /* Set the port for internal loopback mode.
4076  * The TxCLK and RxCLK signals are generated from the BRG and
4077  * the TxD is looped back to the RxD internally.
4078  */
4079 void enable_loopback(SLMP_INFO *info, int enable)
4080 {
4081         if (enable) {
4082                 /* MD2 (Mode Register 2)
4083                  * 01..00  CNCT<1..0> Channel Connection 11=Local Loopback
4084                  */
4085                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4086
4087                 /* degate external TxC clock source */
4088                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4089                 write_control_reg(info);
4090
4091                 /* RXS/TXS (Rx/Tx clock source)
4092                  * 07      Reserved, must be 0
4093                  * 06..04  Clock Source, 100=BRG
4094                  * 03..00  Clock Divisor, 0000=1
4095                  */
4096                 write_reg(info, RXS, 0x40);
4097                 write_reg(info, TXS, 0x40);
4098
4099         } else {
4100                 /* MD2 (Mode Register 2)
4101                  * 01..00  CNCT<1..0> Channel connection, 0=normal
4102                  */
4103                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4104
4105                 /* RXS/TXS (Rx/Tx clock source)
4106                  * 07      Reserved, must be 0
4107                  * 06..04  Clock Source, 000=RxC/TxC Pin
4108                  * 03..00  Clock Divisor, 0000=1
4109                  */
4110                 write_reg(info, RXS, 0x00);
4111                 write_reg(info, TXS, 0x00);
4112         }
4113
4114         /* set LinkSpeed if available, otherwise default to 2Mbps */
4115         if (info->params.clock_speed)
4116                 set_rate(info, info->params.clock_speed);
4117         else
4118                 set_rate(info, 3686400);
4119 }
4120
4121 /* Set the baud rate register to the desired speed
4122  *
4123  *      data_rate       data rate of clock in bits per second
4124  *                      A data rate of 0 disables the AUX clock.
4125  */
4126 void set_rate( SLMP_INFO *info, u32 data_rate )
4127 {
4128         u32 TMCValue;
4129         unsigned char BRValue;
4130         u32 Divisor=0;
4131
4132         /* fBRG = fCLK/(TMC * 2^BR)
4133          */
4134         if (data_rate != 0) {
4135                 Divisor = 14745600/data_rate;
4136                 if (!Divisor)
4137                         Divisor = 1;
4138
4139                 TMCValue = Divisor;
4140
4141                 BRValue = 0;
4142                 if (TMCValue != 1 && TMCValue != 2) {
4143                         /* BRValue of 0 provides 50/50 duty cycle *only* when
4144                          * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4145                          * 50/50 duty cycle.
4146                          */
4147                         BRValue = 1;
4148                         TMCValue >>= 1;
4149                 }
4150
4151                 /* while TMCValue is too big for TMC register, divide
4152                  * by 2 and increment BR exponent.
4153                  */
4154                 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4155                         TMCValue >>= 1;
4156
4157                 write_reg(info, TXS,
4158                         (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4159                 write_reg(info, RXS,
4160                         (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4161                 write_reg(info, TMC, (unsigned char)TMCValue);
4162         }
4163         else {
4164                 write_reg(info, TXS,0);
4165                 write_reg(info, RXS,0);
4166                 write_reg(info, TMC, 0);
4167         }
4168 }
4169
4170 /* Disable receiver
4171  */
4172 void rx_stop(SLMP_INFO *info)
4173 {
4174         if (debug_level >= DEBUG_LEVEL_ISR)
4175                 printk("%s(%d):%s rx_stop()\n",
4176                          __FILE__,__LINE__, info->device_name );
4177
4178         write_reg(info, CMD, RXRESET);
4179
4180         info->ie0_value &= ~RXRDYE;
4181         write_reg(info, IE0, info->ie0_value);  /* disable Rx data interrupts */
4182
4183         write_reg(info, RXDMA + DSR, 0);        /* disable Rx DMA */
4184         write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4185         write_reg(info, RXDMA + DIR, 0);        /* disable Rx DMA interrupts */
4186
4187         info->rx_enabled = 0;
4188         info->rx_overflow = 0;
4189 }
4190
4191 /* enable the receiver
4192  */
4193 void rx_start(SLMP_INFO *info)
4194 {
4195         int i;
4196
4197         if (debug_level >= DEBUG_LEVEL_ISR)
4198                 printk("%s(%d):%s rx_start()\n",
4199                          __FILE__,__LINE__, info->device_name );
4200
4201         write_reg(info, CMD, RXRESET);
4202
4203         if ( info->params.mode == MGSL_MODE_HDLC ) {
4204                 /* HDLC, disabe IRQ on rxdata */
4205                 info->ie0_value &= ~RXRDYE;
4206                 write_reg(info, IE0, info->ie0_value);
4207
4208                 /* Reset all Rx DMA buffers and program rx dma */
4209                 write_reg(info, RXDMA + DSR, 0);                /* disable Rx DMA */
4210                 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4211
4212                 for (i = 0; i < info->rx_buf_count; i++) {
4213                         info->rx_buf_list[i].status = 0xff;
4214
4215                         // throttle to 4 shared memory writes at a time to prevent
4216                         // hogging local bus (keep latency time for DMA requests low).
4217                         if (!(i % 4))
4218                                 read_status_reg(info);
4219                 }
4220                 info->current_rx_buf = 0;
4221
4222                 /* set current/1st descriptor address */
4223                 write_reg16(info, RXDMA + CDA,
4224                         info->rx_buf_list_ex[0].phys_entry);
4225
4226                 /* set new last rx descriptor address */
4227                 write_reg16(info, RXDMA + EDA,
4228                         info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4229
4230                 /* set buffer length (shared by all rx dma data buffers) */
4231                 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4232
4233                 write_reg(info, RXDMA + DIR, 0x60);     /* enable Rx DMA interrupts (EOM/BOF) */
4234                 write_reg(info, RXDMA + DSR, 0xf2);     /* clear Rx DMA IRQs, enable Rx DMA */
4235         } else {
4236                 /* async, enable IRQ on rxdata */
4237                 info->ie0_value |= RXRDYE;
4238                 write_reg(info, IE0, info->ie0_value);
4239         }
4240
4241         write_reg(info, CMD, RXENABLE);
4242
4243         info->rx_overflow = FALSE;
4244         info->rx_enabled = 1;
4245 }
4246
4247 /* Enable the transmitter and send a transmit frame if
4248  * one is loaded in the DMA buffers.
4249  */
4250 void tx_start(SLMP_INFO *info)
4251 {
4252         if (debug_level >= DEBUG_LEVEL_ISR)
4253                 printk("%s(%d):%s tx_start() tx_count=%d\n",
4254                          __FILE__,__LINE__, info->device_name,info->tx_count );
4255
4256         if (!info->tx_enabled ) {
4257                 write_reg(info, CMD, TXRESET);
4258                 write_reg(info, CMD, TXENABLE);
4259                 info->tx_enabled = TRUE;
4260         }
4261
4262         if ( info->tx_count ) {
4263
4264                 /* If auto RTS enabled and RTS is inactive, then assert */
4265                 /* RTS and set a flag indicating that the driver should */
4266                 /* negate RTS when the transmission completes. */
4267
4268                 info->drop_rts_on_tx_done = 0;
4269
4270                 if (info->params.mode != MGSL_MODE_ASYNC) {
4271
4272                         if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4273                                 get_signals( info );
4274                                 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4275                                         info->serial_signals |= SerialSignal_RTS;
4276                                         set_signals( info );
4277                                         info->drop_rts_on_tx_done = 1;
4278                                 }
4279                         }
4280
4281                         write_reg16(info, TRC0,
4282                                 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4283
4284                         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4285                         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4286
4287                         /* set TX CDA (current descriptor address) */
4288                         write_reg16(info, TXDMA + CDA,
4289                                 info->tx_buf_list_ex[0].phys_entry);
4290
4291                         /* set TX EDA (last descriptor address) */
4292                         write_reg16(info, TXDMA + EDA,
4293                                 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4294
4295                         /* enable underrun IRQ */
4296                         info->ie1_value &= ~IDLE;
4297                         info->ie1_value |= UDRN;
4298                         write_reg(info, IE1, info->ie1_value);
4299                         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4300
4301                         write_reg(info, TXDMA + DIR, 0x40);             /* enable Tx DMA interrupts (EOM) */
4302                         write_reg(info, TXDMA + DSR, 0xf2);             /* clear Tx DMA IRQs, enable Tx DMA */
4303
4304                         info->tx_timer.expires = jiffies + msecs_to_jiffies(5000);
4305                         add_timer(&info->tx_timer);
4306                 }
4307                 else {
4308                         tx_load_fifo(info);
4309                         /* async, enable IRQ on txdata */
4310                         info->ie0_value |= TXRDYE;
4311                         write_reg(info, IE0, info->ie0_value);
4312                 }
4313
4314                 info->tx_active = 1;
4315         }
4316 }
4317
4318 /* stop the transmitter and DMA
4319  */
4320 void tx_stop( SLMP_INFO *info )
4321 {
4322         if (debug_level >= DEBUG_LEVEL_ISR)
4323                 printk("%s(%d):%s tx_stop()\n",
4324                          __FILE__,__LINE__, info->device_name );
4325
4326         del_timer(&info->tx_timer);
4327
4328         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4329         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4330
4331         write_reg(info, CMD, TXRESET);
4332
4333         info->ie1_value &= ~(UDRN + IDLE);
4334         write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
4335         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
4336
4337         info->ie0_value &= ~TXRDYE;
4338         write_reg(info, IE0, info->ie0_value);  /* disable tx data interrupts */
4339
4340         info->tx_enabled = 0;
4341         info->tx_active  = 0;
4342 }
4343
4344 /* Fill the transmit FIFO until the FIFO is full or
4345  * there is no more data to load.
4346  */
4347 void tx_load_fifo(SLMP_INFO *info)
4348 {
4349         u8 TwoBytes[2];
4350
4351         /* do nothing is now tx data available and no XON/XOFF pending */
4352
4353         if ( !info->tx_count && !info->x_char )
4354                 return;
4355
4356         /* load the Transmit FIFO until FIFOs full or all data sent */
4357
4358         while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4359
4360                 /* there is more space in the transmit FIFO and */
4361                 /* there is more data in transmit buffer */
4362
4363                 if ( (info->tx_count > 1) && !info->x_char ) {
4364                         /* write 16-bits */
4365                         TwoBytes[0] = info->tx_buf[info->tx_get++];
4366                         if (info->tx_get >= info->max_frame_size)
4367                                 info->tx_get -= info->max_frame_size;
4368                         TwoBytes[1] = info->tx_buf[info->tx_get++];
4369                         if (info->tx_get >= info->max_frame_size)
4370                                 info->tx_get -= info->max_frame_size;
4371
4372                         write_reg16(info, TRB, *((u16 *)TwoBytes));
4373
4374                         info->tx_count -= 2;
4375                         info->icount.tx += 2;
4376                 } else {
4377                         /* only 1 byte left to transmit or 1 FIFO slot left */
4378
4379                         if (info->x_char) {
4380                                 /* transmit pending high priority char */
4381                                 write_reg(info, TRB, info->x_char);
4382                                 info->x_char = 0;
4383                         } else {
4384                                 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4385                                 if (info->tx_get >= info->max_frame_size)
4386                                         info->tx_get -= info->max_frame_size;
4387                                 info->tx_count--;
4388                         }
4389                         info->icount.tx++;
4390                 }
4391         }
4392 }
4393
4394 /* Reset a port to a known state
4395  */
4396 void reset_port(SLMP_INFO *info)
4397 {
4398         if (info->sca_base) {
4399
4400                 tx_stop(info);
4401                 rx_stop(info);
4402
4403                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4404                 set_signals(info);
4405
4406                 /* disable all port interrupts */
4407                 info->ie0_value = 0;
4408                 info->ie1_value = 0;
4409                 info->ie2_value = 0;
4410                 write_reg(info, IE0, info->ie0_value);
4411                 write_reg(info, IE1, info->ie1_value);
4412                 write_reg(info, IE2, info->ie2_value);
4413
4414                 write_reg(info, CMD, CHRESET);
4415         }
4416 }
4417
4418 /* Reset all the ports to a known state.
4419  */
4420 void reset_adapter(SLMP_INFO *info)
4421 {
4422         int i;
4423
4424         for ( i=0; i < SCA_MAX_PORTS; ++i) {
4425                 if (info->port_array[i])
4426                         reset_port(info->port_array[i]);
4427         }
4428 }
4429
4430 /* Program port for asynchronous communications.
4431  */
4432 void async_mode(SLMP_INFO *info)
4433 {
4434
4435         unsigned char RegValue;
4436
4437         tx_stop(info);
4438         rx_stop(info);
4439
4440         /* MD0, Mode Register 0
4441          *
4442          * 07..05  PRCTL<2..0>, Protocol Mode, 000=async
4443          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4444          * 03      Reserved, must be 0
4445          * 02      CRCCC, CRC Calculation, 0=disabled
4446          * 01..00  STOP<1..0> Stop bits (00=1,10=2)
4447          *
4448          * 0000 0000
4449          */
4450         RegValue = 0x00;
4451         if (info->params.stop_bits != 1)
4452                 RegValue |= BIT1;
4453         write_reg(info, MD0, RegValue);
4454
4455         /* MD1, Mode Register 1
4456          *
4457          * 07..06  BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4458          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4459          * 03..02  RXCHR<1..0>, rx char size
4460          * 01..00  PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4461          *
4462          * 0100 0000
4463          */
4464         RegValue = 0x40;
4465         switch (info->params.data_bits) {
4466         case 7: RegValue |= BIT4 + BIT2; break;
4467         case 6: RegValue |= BIT5 + BIT3; break;
4468         case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4469         }
4470         if (info->params.parity != ASYNC_PARITY_NONE) {
4471                 RegValue |= BIT1;
4472                 if (info->params.parity == ASYNC_PARITY_ODD)
4473                         RegValue |= BIT0;
4474         }
4475         write_reg(info, MD1, RegValue);
4476
4477         /* MD2, Mode Register 2
4478          *
4479          * 07..02  Reserved, must be 0
4480          * 01..00  CNCT<1..0> Channel connection, 00=normal 11=local loopback
4481          *
4482          * 0000 0000
4483          */
4484         RegValue = 0x00;
4485         if (info->params.loopback)
4486                 RegValue |= (BIT1 + BIT0);
4487         write_reg(info, MD2, RegValue);
4488
4489         /* RXS, Receive clock source
4490          *
4491          * 07      Reserved, must be 0
4492          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4493          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4494          */
4495         RegValue=BIT6;
4496         write_reg(info, RXS, RegValue);
4497
4498         /* TXS, Transmit clock source
4499          *
4500          * 07      Reserved, must be 0
4501          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4502          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4503          */
4504         RegValue=BIT6;
4505         write_reg(info, TXS, RegValue);
4506
4507         /* Control Register
4508          *
4509          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4510          */
4511         info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4512         write_control_reg(info);
4513
4514         tx_set_idle(info);
4515
4516         /* RRC Receive Ready Control 0
4517          *
4518          * 07..05  Reserved, must be 0
4519          * 04..00  RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4520          */
4521         write_reg(info, RRC, 0x00);
4522
4523         /* TRC0 Transmit Ready Control 0
4524          *
4525          * 07..05  Reserved, must be 0
4526          * 04..00  TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4527          */
4528         write_reg(info, TRC0, 0x10);
4529
4530         /* TRC1 Transmit Ready Control 1
4531          *
4532          * 07..05  Reserved, must be 0
4533          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4534          */
4535         write_reg(info, TRC1, 0x1e);
4536
4537         /* CTL, MSCI control register
4538          *
4539          * 07..06  Reserved, set to 0
4540          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4541          * 04      IDLC, idle control, 0=mark 1=idle register
4542          * 03      BRK, break, 0=off 1 =on (async)
4543          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4544          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4545          * 00      RTS, RTS output control, 0=active 1=inactive
4546          *
4547          * 0001 0001
4548          */
4549         RegValue = 0x10;
4550         if (!(info->serial_signals & SerialSignal_RTS))
4551                 RegValue |= 0x01;
4552         write_reg(info, CTL, RegValue);
4553
4554         /* enable status interrupts */
4555         info->ie0_value |= TXINTE + RXINTE;
4556         write_reg(info, IE0, info->ie0_value);
4557
4558         /* enable break detect interrupt */
4559         info->ie1_value = BRKD;
4560         write_reg(info, IE1, info->ie1_value);
4561
4562         /* enable rx overrun interrupt */
4563         info->ie2_value = OVRN;
4564         write_reg(info, IE2, info->ie2_value);
4565
4566         set_rate( info, info->params.data_rate * 16 );
4567 }
4568
4569 /* Program the SCA for HDLC communications.
4570  */
4571 void hdlc_mode(SLMP_INFO *info)
4572 {
4573         unsigned char RegValue;
4574         u32 DpllDivisor;
4575
4576         // Can't use DPLL because SCA outputs recovered clock on RxC when
4577         // DPLL mode selected. This causes output contention with RxC receiver.
4578         // Use of DPLL would require external hardware to disable RxC receiver
4579         // when DPLL mode selected.
4580         info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4581
4582         /* disable DMA interrupts */
4583         write_reg(info, TXDMA + DIR, 0);
4584         write_reg(info, RXDMA + DIR, 0);
4585
4586         /* MD0, Mode Register 0
4587          *
4588          * 07..05  PRCTL<2..0>, Protocol Mode, 100=HDLC
4589          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4590          * 03      Reserved, must be 0
4591          * 02      CRCCC, CRC Calculation, 1=enabled
4592          * 01      CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4593          * 00      CRC0, CRC initial value, 1 = all 1s
4594          *
4595          * 1000 0001
4596          */
4597         RegValue = 0x81;
4598         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4599                 RegValue |= BIT4;
4600         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4601                 RegValue |= BIT4;
4602         if (info->params.crc_type == HDLC_CRC_16_CCITT)
4603                 RegValue |= BIT2 + BIT1;
4604         write_reg(info, MD0, RegValue);
4605
4606         /* MD1, Mode Register 1
4607          *
4608          * 07..06  ADDRS<1..0>, Address detect, 00=no addr check
4609          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits
4610          * 03..02  RXCHR<1..0>, rx char size, 00=8 bits
4611          * 01..00  PMPM<1..0>, Parity mode, 00=no parity
4612          *
4613          * 0000 0000
4614          */
4615         RegValue = 0x00;
4616         write_reg(info, MD1, RegValue);
4617
4618         /* MD2, Mode Register 2
4619          *
4620          * 07      NRZFM, 0=NRZ, 1=FM
4621          * 06..05  CODE<1..0> Encoding, 00=NRZ
4622          * 04..03  DRATE<1..0> DPLL Divisor, 00=8
4623          * 02      Reserved, must be 0
4624          * 01..00  CNCT<1..0> Channel connection, 0=normal
4625          *
4626          * 0000 0000
4627          */
4628         RegValue = 0x00;
4629         switch(info->params.encoding) {
4630         case HDLC_ENCODING_NRZI:          RegValue |= BIT5; break;
4631         case HDLC_ENCODING_BIPHASE_MARK:  RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4632         case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4633         case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break;      /* aka Manchester */
4634 #if 0
4635         case HDLC_ENCODING_NRZB:                                        /* not supported */
4636         case HDLC_ENCODING_NRZI_MARK:                                   /* not supported */
4637         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:                          /* not supported */
4638 #endif
4639         }
4640         if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4641                 DpllDivisor = 16;
4642                 RegValue |= BIT3;
4643         } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4644                 DpllDivisor = 8;
4645         } else {
4646                 DpllDivisor = 32;
4647                 RegValue |= BIT4;
4648         }
4649         write_reg(info, MD2, RegValue);
4650
4651
4652         /* RXS, Receive clock source
4653          *
4654          * 07      Reserved, must be 0
4655          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4656          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4657          */
4658         RegValue=0;
4659         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4660                 RegValue |= BIT6;
4661         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4662                 RegValue |= BIT6 + BIT5;
4663         write_reg(info, RXS, RegValue);
4664
4665         /* TXS, Transmit clock source
4666          *
4667          * 07      Reserved, must be 0
4668          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4669          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4670          */
4671         RegValue=0;
4672         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4673                 RegValue |= BIT6;
4674         if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4675                 RegValue |= BIT6 + BIT5;
4676         write_reg(info, TXS, RegValue);
4677
4678         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4679                 set_rate(info, info->params.clock_speed * DpllDivisor);
4680         else
4681                 set_rate(info, info->params.clock_speed);
4682
4683         /* GPDATA (General Purpose I/O Data Register)
4684          *
4685          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4686          */
4687         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4688                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4689         else
4690                 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4691         write_control_reg(info);
4692
4693         /* RRC Receive Ready Control 0
4694          *
4695          * 07..05  Reserved, must be 0
4696          * 04..00  RRC<4..0> Rx FIFO trigger active
4697          */
4698         write_reg(info, RRC, rx_active_fifo_level);
4699
4700         /* TRC0 Transmit Ready Control 0
4701          *
4702          * 07..05  Reserved, must be 0
4703          * 04..00  TRC<4..0> Tx FIFO trigger active
4704          */
4705         write_reg(info, TRC0, tx_active_fifo_level);
4706
4707         /* TRC1 Transmit Ready Control 1
4708          *
4709          * 07..05  Reserved, must be 0
4710          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4711          */
4712         write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4713
4714         /* DMR, DMA Mode Register
4715          *
4716          * 07..05  Reserved, must be 0
4717          * 04      TMOD, Transfer Mode: 1=chained-block
4718          * 03      Reserved, must be 0
4719          * 02      NF, Number of Frames: 1=multi-frame
4720          * 01      CNTE, Frame End IRQ Counter enable: 0=disabled
4721          * 00      Reserved, must be 0
4722          *
4723          * 0001 0100
4724          */
4725         write_reg(info, TXDMA + DMR, 0x14);
4726         write_reg(info, RXDMA + DMR, 0x14);
4727
4728         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4729         write_reg(info, RXDMA + CPB,
4730                 (unsigned char)(info->buffer_list_phys >> 16));
4731
4732         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4733         write_reg(info, TXDMA + CPB,
4734                 (unsigned char)(info->buffer_list_phys >> 16));
4735
4736         /* enable status interrupts. other code enables/disables
4737          * the individual sources for these two interrupt classes.
4738          */
4739         info->ie0_value |= TXINTE + RXINTE;
4740         write_reg(info, IE0, info->ie0_value);
4741
4742         /* CTL, MSCI control register
4743          *
4744          * 07..06  Reserved, set to 0
4745          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4746          * 04      IDLC, idle control, 0=mark 1=idle register
4747          * 03      BRK, break, 0=off 1 =on (async)
4748          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4749          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4750          * 00      RTS, RTS output control, 0=active 1=inactive
4751          *
4752          * 0001 0001
4753          */
4754         RegValue = 0x10;
4755         if (!(info->serial_signals & SerialSignal_RTS))
4756                 RegValue |= 0x01;
4757         write_reg(info, CTL, RegValue);
4758
4759         /* preamble not supported ! */
4760
4761         tx_set_idle(info);
4762         tx_stop(info);
4763         rx_stop(info);
4764
4765         set_rate(info, info->params.clock_speed);
4766
4767         if (info->params.loopback)
4768                 enable_loopback(info,1);
4769 }
4770
4771 /* Set the transmit HDLC idle mode
4772  */
4773 void tx_set_idle(SLMP_INFO *info)
4774 {
4775         unsigned char RegValue = 0xff;
4776
4777         /* Map API idle mode to SCA register bits */
4778         switch(info->idle_mode) {
4779         case HDLC_TXIDLE_FLAGS:                 RegValue = 0x7e; break;
4780         case HDLC_TXIDLE_ALT_ZEROS_ONES:        RegValue = 0xaa; break;
4781         case HDLC_TXIDLE_ZEROS:                 RegValue = 0x00; break;
4782         case HDLC_TXIDLE_ONES:                  RegValue = 0xff; break;
4783         case HDLC_TXIDLE_ALT_MARK_SPACE:        RegValue = 0xaa; break;
4784         case HDLC_TXIDLE_SPACE:                 RegValue = 0x00; break;
4785         case HDLC_TXIDLE_MARK:                  RegValue = 0xff; break;
4786         }
4787
4788         write_reg(info, IDL, RegValue);
4789 }
4790
4791 /* Query the adapter for the state of the V24 status (input) signals.
4792  */
4793 void get_signals(SLMP_INFO *info)
4794 {
4795         u16 status = read_reg(info, SR3);
4796         u16 gpstatus = read_status_reg(info);
4797         u16 testbit;
4798
4799         /* clear all serial signals except DTR and RTS */
4800         info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
4801
4802         /* set serial signal bits to reflect MISR */
4803
4804         if (!(status & BIT3))
4805                 info->serial_signals |= SerialSignal_CTS;
4806
4807         if ( !(status & BIT2))
4808                 info->serial_signals |= SerialSignal_DCD;
4809
4810         testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4811         if (!(gpstatus & testbit))
4812                 info->serial_signals |= SerialSignal_RI;
4813
4814         testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4815         if (!(gpstatus & testbit))
4816                 info->serial_signals |= SerialSignal_DSR;
4817 }
4818
4819 /* Set the state of DTR and RTS based on contents of
4820  * serial_signals member of device context.
4821  */
4822 void set_signals(SLMP_INFO *info)
4823 {
4824         unsigned char RegValue;
4825         u16 EnableBit;
4826
4827         RegValue = read_reg(info, CTL);
4828         if (info->serial_signals & SerialSignal_RTS)
4829                 RegValue &= ~BIT0;
4830         else
4831                 RegValue |= BIT0;
4832         write_reg(info, CTL, RegValue);
4833
4834         // Port 0..3 DTR is ctrl reg <1,3,5,7>
4835         EnableBit = BIT1 << (info->port_num*2);
4836         if (info->serial_signals & SerialSignal_DTR)
4837                 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4838         else
4839                 info->port_array[0]->ctrlreg_value |= EnableBit;
4840         write_control_reg(info);
4841 }
4842
4843 /*******************/
4844 /* DMA Buffer Code */
4845 /*******************/
4846
4847 /* Set the count for all receive buffers to SCABUFSIZE
4848  * and set the current buffer to the first buffer. This effectively
4849  * makes all buffers free and discards any data in buffers.
4850  */
4851 void rx_reset_buffers(SLMP_INFO *info)
4852 {
4853         rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4854 }
4855
4856 /* Free the buffers used by a received frame
4857  *
4858  * info   pointer to device instance data
4859  * first  index of 1st receive buffer of frame
4860  * last   index of last receive buffer of frame
4861  */
4862 void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4863 {
4864         int done = 0;
4865
4866         while(!done) {
4867                 /* reset current buffer for reuse */
4868                 info->rx_buf_list[first].status = 0xff;
4869
4870                 if (first == last) {
4871                         done = 1;
4872                         /* set new last rx descriptor address */
4873                         write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4874                 }
4875
4876                 first++;
4877                 if (first == info->rx_buf_count)
4878                         first = 0;
4879         }
4880
4881         /* set current buffer to next buffer after last buffer of frame */
4882         info->current_rx_buf = first;
4883 }
4884
4885 /* Return a received frame from the receive DMA buffers.
4886  * Only frames received without errors are returned.
4887  *
4888  * Return Value:        1 if frame returned, otherwise 0
4889  */
4890 int rx_get_frame(SLMP_INFO *info)
4891 {
4892         unsigned int StartIndex, EndIndex;      /* index of 1st and last buffers of Rx frame */
4893         unsigned short status;
4894         unsigned int framesize = 0;
4895         int ReturnCode = 0;
4896         unsigned long flags;
4897         struct tty_struct *tty = info->tty;
4898         unsigned char addr_field = 0xff;
4899         SCADESC *desc;
4900         SCADESC_EX *desc_ex;
4901
4902 CheckAgain:
4903         /* assume no frame returned, set zero length */
4904         framesize = 0;
4905         addr_field = 0xff;
4906
4907         /*
4908          * current_rx_buf points to the 1st buffer of the next available
4909          * receive frame. To find the last buffer of the frame look for
4910          * a non-zero status field in the buffer entries. (The status
4911          * field is set by the 16C32 after completing a receive frame.
4912          */
4913         StartIndex = EndIndex = info->current_rx_buf;
4914
4915         for ( ;; ) {
4916                 desc = &info->rx_buf_list[EndIndex];
4917                 desc_ex = &info->rx_buf_list_ex[EndIndex];
4918
4919                 if (desc->status == 0xff)
4920                         goto Cleanup;   /* current desc still in use, no frames available */
4921
4922                 if (framesize == 0 && info->params.addr_filter != 0xff)
4923                         addr_field = desc_ex->virt_addr[0];
4924
4925                 framesize += desc->length;
4926
4927                 /* Status != 0 means last buffer of frame */
4928                 if (desc->status)
4929                         break;
4930
4931                 EndIndex++;
4932                 if (EndIndex == info->rx_buf_count)
4933                         EndIndex = 0;
4934
4935                 if (EndIndex == info->current_rx_buf) {
4936                         /* all buffers have been 'used' but none mark      */
4937                         /* the end of a frame. Reset buffers and receiver. */
4938                         if ( info->rx_enabled ){
4939                                 spin_lock_irqsave(&info->lock,flags);
4940                                 rx_start(info);
4941                                 spin_unlock_irqrestore(&info->lock,flags);
4942                         }
4943                         goto Cleanup;
4944                 }
4945
4946         }
4947
4948         /* check status of receive frame */
4949
4950         /* frame status is byte stored after frame data
4951          *
4952          * 7 EOM (end of msg), 1 = last buffer of frame
4953          * 6 Short Frame, 1 = short frame
4954          * 5 Abort, 1 = frame aborted
4955          * 4 Residue, 1 = last byte is partial
4956          * 3 Overrun, 1 = overrun occurred during frame reception
4957          * 2 CRC,     1 = CRC error detected
4958          *
4959          */
4960         status = desc->status;
4961
4962         /* ignore CRC bit if not using CRC (bit is undefined) */
4963         /* Note:CRC is not save to data buffer */
4964         if (info->params.crc_type == HDLC_CRC_NONE)
4965                 status &= ~BIT2;
4966
4967         if (framesize == 0 ||
4968                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4969                 /* discard 0 byte frames, this seems to occur sometime
4970                  * when remote is idling flags.
4971                  */
4972                 rx_free_frame_buffers(info, StartIndex, EndIndex);
4973                 goto CheckAgain;
4974         }
4975
4976         if (framesize < 2)
4977                 status |= BIT6;
4978
4979         if (status & (BIT6+BIT5+BIT3+BIT2)) {
4980                 /* received frame has errors,
4981                  * update counts and mark frame size as 0
4982                  */
4983                 if (status & BIT6)
4984                         info->icount.rxshort++;
4985                 else if (status & BIT5)
4986                         info->icount.rxabort++;
4987                 else if (status & BIT3)
4988                         info->icount.rxover++;
4989                 else
4990                         info->icount.rxcrc++;
4991
4992                 framesize = 0;
4993 #ifdef CONFIG_HDLC
4994                 {
4995                         struct net_device_stats *stats = hdlc_stats(info->netdev);
4996                         stats->rx_errors++;
4997                         stats->rx_frame_errors++;
4998                 }
4999 #endif
5000         }
5001
5002         if ( debug_level >= DEBUG_LEVEL_BH )
5003                 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
5004                         __FILE__,__LINE__,info->device_name,status,framesize);
5005
5006         if ( debug_level >= DEBUG_LEVEL_DATA )
5007                 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
5008                         min_t(int, framesize,SCABUFSIZE),0);
5009
5010         if (framesize) {
5011                 if (framesize > info->max_frame_size)
5012                         info->icount.rxlong++;
5013                 else {
5014                         /* copy dma buffer(s) to contiguous intermediate buffer */
5015                         int copy_count = framesize;
5016                         int index = StartIndex;
5017                         unsigned char *ptmp = info->tmp_rx_buf;
5018                         info->tmp_rx_buf_count = framesize;
5019
5020                         info->icount.rxok++;
5021
5022                         while(copy_count) {
5023                                 int partial_count = min(copy_count,SCABUFSIZE);
5024                                 memcpy( ptmp,
5025                                         info->rx_buf_list_ex[index].virt_addr,
5026                                         partial_count );
5027                                 ptmp += partial_count;
5028                                 copy_count -= partial_count;
5029
5030                                 if ( ++index == info->rx_buf_count )
5031                                         index = 0;
5032                         }
5033
5034 #ifdef CONFIG_HDLC
5035                         if (info->netcount)
5036                                 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
5037                         else
5038 #endif
5039                                 ldisc_receive_buf(tty,info->tmp_rx_buf,
5040                                                   info->flag_buf, framesize);
5041                 }
5042         }
5043         /* Free the buffers used by this frame. */
5044         rx_free_frame_buffers( info, StartIndex, EndIndex );
5045
5046         ReturnCode = 1;
5047
5048 Cleanup:
5049         if ( info->rx_enabled && info->rx_overflow ) {
5050                 /* Receiver is enabled, but needs to restarted due to
5051                  * rx buffer overflow. If buffers are empty, restart receiver.
5052                  */
5053                 if (info->rx_buf_list[EndIndex].status == 0xff) {
5054                         spin_lock_irqsave(&info->lock,flags);
5055                         rx_start(info);
5056                         spin_unlock_irqrestore(&info->lock,flags);
5057                 }
5058         }
5059
5060         return ReturnCode;
5061 }
5062
5063 /* load the transmit DMA buffer with data
5064  */
5065 void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5066 {
5067         unsigned short copy_count;
5068         unsigned int i = 0;
5069         SCADESC *desc;
5070         SCADESC_EX *desc_ex;
5071
5072         if ( debug_level >= DEBUG_LEVEL_DATA )
5073                 trace_block(info,buf, min_t(int, count,SCABUFSIZE), 1);
5074
5075         /* Copy source buffer to one or more DMA buffers, starting with
5076          * the first transmit dma buffer.
5077          */
5078         for(i=0;;)
5079         {
5080                 copy_count = min_t(unsigned short,count,SCABUFSIZE);
5081
5082                 desc = &info->tx_buf_list[i];
5083                 desc_ex = &info->tx_buf_list_ex[i];
5084
5085                 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5086
5087                 desc->length = copy_count;
5088                 desc->status = 0;
5089
5090                 buf += copy_count;
5091                 count -= copy_count;
5092
5093                 if (!count)
5094                         break;
5095
5096                 i++;
5097                 if (i >= info->tx_buf_count)
5098                         i = 0;
5099         }
5100
5101         info->tx_buf_list[i].status = 0x81;     /* set EOM and EOT status */
5102         info->last_tx_buf = ++i;
5103 }
5104
5105 int register_test(SLMP_INFO *info)
5106 {
5107         static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5108         static unsigned int count = sizeof(testval)/sizeof(unsigned char);
5109         unsigned int i;
5110         int rc = TRUE;
5111         unsigned long flags;
5112
5113         spin_lock_irqsave(&info->lock,flags);
5114         reset_port(info);
5115
5116         /* assume failure */
5117         info->init_error = DiagStatus_AddressFailure;
5118
5119         /* Write bit patterns to various registers but do it out of */
5120         /* sync, then read back and verify values. */
5121
5122         for (i = 0 ; i < count ; i++) {
5123                 write_reg(info, TMC, testval[i]);
5124                 write_reg(info, IDL, testval[(i+1)%count]);
5125                 write_reg(info, SA0, testval[(i+2)%count]);
5126                 write_reg(info, SA1, testval[(i+3)%count]);
5127
5128                 if ( (read_reg(info, TMC) != testval[i]) ||
5129                           (read_reg(info, IDL) != testval[(i+1)%count]) ||
5130                           (read_reg(info, SA0) != testval[(i+2)%count]) ||
5131                           (read_reg(info, SA1) != testval[(i+3)%count]) )
5132                 {
5133                         rc = FALSE;
5134                         break;
5135                 }
5136         }
5137
5138         reset_port(info);
5139         spin_unlock_irqrestore(&info->lock,flags);
5140
5141         return rc;
5142 }
5143
5144 int irq_test(SLMP_INFO *info)
5145 {
5146         unsigned long timeout;
5147         unsigned long flags;
5148
5149         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5150
5151         spin_lock_irqsave(&info->lock,flags);
5152         reset_port(info);
5153
5154         /* assume failure */
5155         info->init_error = DiagStatus_IrqFailure;
5156         info->irq_occurred = FALSE;
5157
5158         /* setup timer0 on SCA0 to interrupt */
5159
5160         /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5161         write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5162
5163         write_reg(info, (unsigned char)(timer + TEPR), 0);      /* timer expand prescale */
5164         write_reg16(info, (unsigned char)(timer + TCONR), 1);   /* timer constant */
5165
5166
5167         /* TMCS, Timer Control/Status Register
5168          *
5169          * 07      CMF, Compare match flag (read only) 1=match
5170          * 06      ECMI, CMF Interrupt Enable: 1=enabled
5171          * 05      Reserved, must be 0
5172          * 04      TME, Timer Enable
5173          * 03..00  Reserved, must be 0
5174          *
5175          * 0101 0000
5176          */
5177         write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5178
5179         spin_unlock_irqrestore(&info->lock,flags);
5180
5181         timeout=100;
5182         while( timeout-- && !info->irq_occurred ) {
5183                 msleep_interruptible(10);
5184         }
5185
5186         spin_lock_irqsave(&info->lock,flags);
5187         reset_port(info);
5188         spin_unlock_irqrestore(&info->lock,flags);
5189
5190         return info->irq_occurred;
5191 }
5192
5193 /* initialize individual SCA device (2 ports)
5194  */
5195 static int sca_init(SLMP_INFO *info)
5196 {
5197         /* set wait controller to single mem partition (low), no wait states */
5198         write_reg(info, PABR0, 0);      /* wait controller addr boundary 0 */
5199         write_reg(info, PABR1, 0);      /* wait controller addr boundary 1 */
5200         write_reg(info, WCRL, 0);       /* wait controller low range */
5201         write_reg(info, WCRM, 0);       /* wait controller mid range */
5202         write_reg(info, WCRH, 0);       /* wait controller high range */
5203
5204         /* DPCR, DMA Priority Control
5205          *
5206          * 07..05  Not used, must be 0
5207          * 04      BRC, bus release condition: 0=all transfers complete
5208          * 03      CCC, channel change condition: 0=every cycle
5209          * 02..00  PR<2..0>, priority 100=round robin
5210          *
5211          * 00000100 = 0x04
5212          */
5213         write_reg(info, DPCR, dma_priority);
5214
5215         /* DMA Master Enable, BIT7: 1=enable all channels */
5216         write_reg(info, DMER, 0x80);
5217
5218         /* enable all interrupt classes */
5219         write_reg(info, IER0, 0xff);    /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5220         write_reg(info, IER1, 0xff);    /* DMIB,DMIA (channels 0-3) */
5221         write_reg(info, IER2, 0xf0);    /* TIRQ (timers 0-3) */
5222
5223         /* ITCR, interrupt control register
5224          * 07      IPC, interrupt priority, 0=MSCI->DMA
5225          * 06..05  IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5226          * 04      VOS, Vector Output, 0=unmodified vector
5227          * 03..00  Reserved, must be 0
5228          */
5229         write_reg(info, ITCR, 0);
5230
5231         return TRUE;
5232 }
5233
5234 /* initialize adapter hardware
5235  */
5236 int init_adapter(SLMP_INFO *info)
5237 {
5238         int i;
5239
5240         /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5241         volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5242         u32 readval;
5243
5244         info->misc_ctrl_value |= BIT30;
5245         *MiscCtrl = info->misc_ctrl_value;
5246
5247         /*
5248          * Force at least 170ns delay before clearing
5249          * reset bit. Each read from LCR takes at least
5250          * 30ns so 10 times for 300ns to be safe.
5251          */
5252         for(i=0;i<10;i++)
5253                 readval = *MiscCtrl;
5254
5255         info->misc_ctrl_value &= ~BIT30;
5256         *MiscCtrl = info->misc_ctrl_value;
5257
5258         /* init control reg (all DTRs off, all clksel=input) */
5259         info->ctrlreg_value = 0xaa;
5260         write_control_reg(info);
5261
5262         {
5263                 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5264                 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5265
5266                 switch(read_ahead_count)
5267                 {
5268                 case 16:
5269                         lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5270                         break;
5271                 case 8:
5272                         lcr1_brdr_value |= BIT5 + BIT4;
5273                         break;
5274                 case 4:
5275                         lcr1_brdr_value |= BIT5 + BIT3;
5276                         break;
5277                 case 0:
5278                         lcr1_brdr_value |= BIT5;
5279                         break;
5280                 }
5281
5282                 *LCR1BRDR = lcr1_brdr_value;
5283                 *MiscCtrl = misc_ctrl_value;
5284         }
5285
5286         sca_init(info->port_array[0]);
5287         sca_init(info->port_array[2]);
5288
5289         return TRUE;
5290 }
5291
5292 /* Loopback an HDLC frame to test the hardware
5293  * interrupt and DMA functions.
5294  */
5295 int loopback_test(SLMP_INFO *info)
5296 {
5297 #define TESTFRAMESIZE 20
5298
5299         unsigned long timeout;
5300         u16 count = TESTFRAMESIZE;
5301         unsigned char buf[TESTFRAMESIZE];
5302         int rc = FALSE;
5303         unsigned long flags;
5304
5305         struct tty_struct *oldtty = info->tty;
5306         u32 speed = info->params.clock_speed;
5307
5308         info->params.clock_speed = 3686400;
5309         info->tty = NULL;
5310
5311         /* assume failure */
5312         info->init_error = DiagStatus_DmaFailure;
5313
5314         /* build and send transmit frame */
5315         for (count = 0; count < TESTFRAMESIZE;++count)
5316                 buf[count] = (unsigned char)count;
5317
5318         memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5319
5320         /* program hardware for HDLC and enabled receiver */
5321         spin_lock_irqsave(&info->lock,flags);
5322         hdlc_mode(info);
5323         enable_loopback(info,1);
5324         rx_start(info);
5325         info->tx_count = count;
5326         tx_load_dma_buffer(info,buf,count);
5327         tx_start(info);
5328         spin_unlock_irqrestore(&info->lock,flags);
5329
5330         /* wait for receive complete */
5331         /* Set a timeout for waiting for interrupt. */
5332         for ( timeout = 100; timeout; --timeout ) {
5333                 msleep_interruptible(10);
5334
5335                 if (rx_get_frame(info)) {
5336                         rc = TRUE;
5337                         break;
5338                 }
5339         }
5340
5341         /* verify received frame length and contents */
5342         if (rc == TRUE &&
5343                 ( info->tmp_rx_buf_count != count ||
5344                   memcmp(buf, info->tmp_rx_buf,count))) {
5345                 rc = FALSE;
5346         }
5347
5348         spin_lock_irqsave(&info->lock,flags);
5349         reset_adapter(info);
5350         spin_unlock_irqrestore(&info->lock,flags);
5351
5352         info->params.clock_speed = speed;
5353         info->tty = oldtty;
5354
5355         return rc;
5356 }
5357
5358 /* Perform diagnostics on hardware
5359  */
5360 int adapter_test( SLMP_INFO *info )
5361 {
5362         unsigned long flags;
5363         if ( debug_level >= DEBUG_LEVEL_INFO )
5364                 printk( "%s(%d):Testing device %s\n",
5365                         __FILE__,__LINE__,info->device_name );
5366
5367         spin_lock_irqsave(&info->lock,flags);
5368         init_adapter(info);
5369         spin_unlock_irqrestore(&info->lock,flags);
5370
5371         info->port_array[0]->port_count = 0;
5372
5373         if ( register_test(info->port_array[0]) &&
5374                 register_test(info->port_array[1])) {
5375
5376                 info->port_array[0]->port_count = 2;
5377
5378                 if ( register_test(info->port_array[2]) &&
5379                         register_test(info->port_array[3]) )
5380                         info->port_array[0]->port_count += 2;
5381         }
5382         else {
5383                 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5384                         __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5385                 return -ENODEV;
5386         }
5387
5388         if ( !irq_test(info->port_array[0]) ||
5389                 !irq_test(info->port_array[1]) ||
5390                  (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5391                  (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5392                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5393                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5394                 return -ENODEV;
5395         }
5396
5397         if (!loopback_test(info->port_array[0]) ||
5398                 !loopback_test(info->port_array[1]) ||
5399                  (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5400                  (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5401                 printk( "%s(%d):DMA test failure for device %s\n",
5402                         __FILE__,__LINE__,info->device_name);
5403                 return -ENODEV;
5404         }
5405
5406         if ( debug_level >= DEBUG_LEVEL_INFO )
5407                 printk( "%s(%d):device %s passed diagnostics\n",
5408                         __FILE__,__LINE__,info->device_name );
5409
5410         info->port_array[0]->init_error = 0;
5411         info->port_array[1]->init_error = 0;
5412         if ( info->port_count > 2 ) {
5413                 info->port_array[2]->init_error = 0;
5414                 info->port_array[3]->init_error = 0;
5415         }
5416
5417         return 0;
5418 }
5419
5420 /* Test the shared memory on a PCI adapter.
5421  */
5422 int memory_test(SLMP_INFO *info)
5423 {
5424         static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5425                 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5426         unsigned long count = sizeof(testval)/sizeof(unsigned long);
5427         unsigned long i;
5428         unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5429         unsigned long * addr = (unsigned long *)info->memory_base;
5430
5431         /* Test data lines with test pattern at one location. */
5432
5433         for ( i = 0 ; i < count ; i++ ) {
5434                 *addr = testval[i];
5435                 if ( *addr != testval[i] )
5436                         return FALSE;
5437         }
5438
5439         /* Test address lines with incrementing pattern over */
5440         /* entire address range. */
5441
5442         for ( i = 0 ; i < limit ; i++ ) {
5443                 *addr = i * 4;
5444                 addr++;
5445         }
5446
5447         addr = (unsigned long *)info->memory_base;
5448
5449         for ( i = 0 ; i < limit ; i++ ) {
5450                 if ( *addr != i * 4 )
5451                         return FALSE;
5452                 addr++;
5453         }
5454
5455         memset( info->memory_base, 0, SCA_MEM_SIZE );
5456         return TRUE;
5457 }
5458
5459 /* Load data into PCI adapter shared memory.
5460  *
5461  * The PCI9050 releases control of the local bus
5462  * after completing the current read or write operation.
5463  *
5464  * While the PCI9050 write FIFO not empty, the
5465  * PCI9050 treats all of the writes as a single transaction
5466  * and does not release the bus. This causes DMA latency problems
5467  * at high speeds when copying large data blocks to the shared memory.
5468  *
5469  * This function breaks a write into multiple transations by
5470  * interleaving a read which flushes the write FIFO and 'completes'
5471  * the write transation. This allows any pending DMA request to gain control
5472  * of the local bus in a timely fasion.
5473  */
5474 void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5475 {
5476         /* A load interval of 16 allows for 4 32-bit writes at */
5477         /* 136ns each for a maximum latency of 542ns on the local bus.*/
5478
5479         unsigned short interval = count / sca_pci_load_interval;
5480         unsigned short i;
5481
5482         for ( i = 0 ; i < interval ; i++ )
5483         {
5484                 memcpy(dest, src, sca_pci_load_interval);
5485                 read_status_reg(info);
5486                 dest += sca_pci_load_interval;
5487                 src += sca_pci_load_interval;
5488         }
5489
5490         memcpy(dest, src, count % sca_pci_load_interval);
5491 }
5492
5493 void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5494 {
5495         int i;
5496         int linecount;
5497         if (xmit)
5498                 printk("%s tx data:\n",info->device_name);
5499         else
5500                 printk("%s rx data:\n",info->device_name);
5501
5502         while(count) {
5503                 if (count > 16)
5504                         linecount = 16;
5505                 else
5506                         linecount = count;
5507
5508                 for(i=0;i<linecount;i++)
5509                         printk("%02X ",(unsigned char)data[i]);
5510                 for(;i<17;i++)
5511                         printk("   ");
5512                 for(i=0;i<linecount;i++) {
5513                         if (data[i]>=040 && data[i]<=0176)
5514                                 printk("%c",data[i]);
5515                         else
5516                                 printk(".");
5517                 }
5518                 printk("\n");
5519
5520                 data  += linecount;
5521                 count -= linecount;
5522         }
5523 }       /* end of trace_block() */
5524
5525 /* called when HDLC frame times out
5526  * update stats and do tx completion processing
5527  */
5528 void tx_timeout(unsigned long context)
5529 {
5530         SLMP_INFO *info = (SLMP_INFO*)context;
5531         unsigned long flags;
5532
5533         if ( debug_level >= DEBUG_LEVEL_INFO )
5534                 printk( "%s(%d):%s tx_timeout()\n",
5535                         __FILE__,__LINE__,info->device_name);
5536         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5537                 info->icount.txtimeout++;
5538         }
5539         spin_lock_irqsave(&info->lock,flags);
5540         info->tx_active = 0;
5541         info->tx_count = info->tx_put = info->tx_get = 0;
5542
5543         spin_unlock_irqrestore(&info->lock,flags);
5544
5545 #ifdef CONFIG_HDLC
5546         if (info->netcount)
5547                 hdlcdev_tx_done(info);
5548         else
5549 #endif
5550                 bh_transmit(info);
5551 }
5552
5553 /* called to periodically check the DSR/RI modem signal input status
5554  */
5555 void status_timeout(unsigned long context)
5556 {
5557         u16 status = 0;
5558         SLMP_INFO *info = (SLMP_INFO*)context;
5559         unsigned long flags;
5560         unsigned char delta;
5561
5562
5563         spin_lock_irqsave(&info->lock,flags);
5564         get_signals(info);
5565         spin_unlock_irqrestore(&info->lock,flags);
5566
5567         /* check for DSR/RI state change */
5568
5569         delta = info->old_signals ^ info->serial_signals;
5570         info->old_signals = info->serial_signals;
5571
5572         if (delta & SerialSignal_DSR)
5573                 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5574
5575         if (delta & SerialSignal_RI)
5576                 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5577
5578         if (delta & SerialSignal_DCD)
5579                 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5580
5581         if (delta & SerialSignal_CTS)
5582                 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5583
5584         if (status)
5585                 isr_io_pin(info,status);
5586
5587         info->status_timer.data = (unsigned long)info;
5588         info->status_timer.function = status_timeout;
5589         info->status_timer.expires = jiffies + msecs_to_jiffies(10);
5590         add_timer(&info->status_timer);
5591 }
5592
5593
5594 /* Register Access Routines -
5595  * All registers are memory mapped
5596  */
5597 #define CALC_REGADDR() \
5598         unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5599         if (info->port_num > 1) \
5600                 RegAddr += 256;                 /* port 0-1 SCA0, 2-3 SCA1 */ \
5601         if ( info->port_num & 1) { \
5602                 if (Addr > 0x7f) \
5603                         RegAddr += 0x40;        /* DMA access */ \
5604                 else if (Addr > 0x1f && Addr < 0x60) \
5605                         RegAddr += 0x20;        /* MSCI access */ \
5606         }
5607
5608
5609 unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5610 {
5611         CALC_REGADDR();
5612         return *RegAddr;
5613 }
5614 void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5615 {
5616         CALC_REGADDR();
5617         *RegAddr = Value;
5618 }
5619
5620 u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5621 {
5622         CALC_REGADDR();
5623         return *((u16 *)RegAddr);
5624 }
5625
5626 void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5627 {
5628         CALC_REGADDR();
5629         *((u16 *)RegAddr) = Value;
5630 }
5631
5632 unsigned char read_status_reg(SLMP_INFO * info)
5633 {
5634         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5635         return *RegAddr;
5636 }
5637
5638 void write_control_reg(SLMP_INFO * info)
5639 {
5640         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5641         *RegAddr = info->port_array[0]->ctrlreg_value;
5642 }
5643
5644
5645 static int __devinit synclinkmp_init_one (struct pci_dev *dev,
5646                                           const struct pci_device_id *ent)
5647 {
5648         if (pci_enable_device(dev)) {
5649                 printk("error enabling pci device %p\n", dev);
5650                 return -EIO;
5651         }
5652         device_init( ++synclinkmp_adapter_count, dev );
5653         return 0;
5654 }
5655
5656 static void __devexit synclinkmp_remove_one (struct pci_dev *dev)
5657 {
5658 }