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