drivers/scsi/g_NCR5380.c

   1 /*
   2  * Generic Generic NCR5380 driver
   3  *
   4  * Copyright 1993, Drew Eckhardt
   5  *      Visionary Computing
   6  *      (Unix and Linux consulting and custom programming)
   7  *      drew@colorado.edu
   8  *      +1 (303) 440-4894
   9  *
  10  * NCR53C400 extensions (c) 1994,1995,1996, Kevin Lentin
  11  *    K.Lentin@cs.monash.edu.au
  12  *
  13  * NCR53C400A extensions (c) 1996, Ingmar Baumgart
  14  *    ingmar@gonzo.schwaben.de
  15  *
  16  * DTC3181E extensions (c) 1997, Ronald van Cuijlenborg
  17  * ronald.van.cuijlenborg@tip.nl or nutty@dds.nl
  18  *
  19  * Added ISAPNP support for DTC436 adapters,
  20  * Thomas Sailer, sailer@ife.ee.ethz.ch
  21  */
  22
  23 /*
  24  * TODO : flesh out DMA support, find some one actually using this (I have
  25  *      a memory mapped Trantor board that works fine)
  26  */
  27
  28 /*
  29  * The card is detected and initialized in one of several ways :
  30  * 1.  With command line overrides - NCR5380=port,irq may be
  31  *     used on the LILO command line to override the defaults.
  32  *
  33  * 2.  With the GENERIC_NCR5380_OVERRIDE compile time define.  This is
  34  *     specified as an array of address, irq, dma, board tuples.  Ie, for
  35  *     one board at 0x350, IRQ5, no dma, I could say
  36  *     -DGENERIC_NCR5380_OVERRIDE={{0xcc000, 5, DMA_NONE, BOARD_NCR5380}}
  37  *
  38  * -1 should be specified for no or DMA interrupt, -2 to autoprobe for an
  39  *      IRQ line if overridden on the command line.
  40  *
  41  * 3.  When included as a module, with arguments passed on the command line:
  42  *         ncr_irq=xx   the interrupt
  43  *         ncr_addr=xx  the port or base address (for port or memory
  44  *                      mapped, resp.)
  45  *         ncr_dma=xx   the DMA
  46  *         ncr_5380=1   to set up for a NCR5380 board
  47  *         ncr_53c400=1 to set up for a NCR53C400 board
  48  *     e.g.
  49  *     modprobe g_NCR5380 ncr_irq=5 ncr_addr=0x350 ncr_5380=1
  50  *       for a port mapped NCR5380 board or
  51  *     modprobe g_NCR5380 ncr_irq=255 ncr_addr=0xc8000 ncr_53c400=1
  52  *       for a memory mapped NCR53C400 board with interrupts disabled.
  53  *
  54  * 255 should be specified for no or DMA interrupt, 254 to autoprobe for an
  55  *      IRQ line if overridden on the command line.
  56  *
  57  */
  58
  59 #define AUTOPROBE_IRQ
  60
  61 #ifdef CONFIG_SCSI_GENERIC_NCR53C400
  62 #define PSEUDO_DMA
  63 #endif
  64
  65 #include <asm/io.h>
  66 #include <linux/blkdev.h>
  67 #include <linux/module.h>
  68 #include <scsi/scsi_host.h>
  69 #include "g_NCR5380.h"
  70 #include "NCR5380.h"
  71 #include <linux/init.h>
  72 #include <linux/ioport.h>
  73 #include <linux/isapnp.h>
  74 #include <linux/interrupt.h>
  75
  76 static int ncr_irq;
  77 static int ncr_dma;
  78 static int ncr_addr;
  79 static int ncr_5380;
  80 static int ncr_53c400;
  81 static int ncr_53c400a;
  82 static int dtc_3181e;
  83 static int hp_c2502;
  84
  85 static struct override {
  86         NCR5380_map_type NCR5380_map_name;
  87         int irq;
  88         int dma;
  89         int board;              /* Use NCR53c400, Ricoh, etc. extensions ? */
  90 } overrides
  91 #ifdef GENERIC_NCR5380_OVERRIDE
  92 [] __initdata = GENERIC_NCR5380_OVERRIDE;
  93 #else
  94 [1] __initdata = { { 0,},};
  95 #endif
  96
  97 #define NO_OVERRIDES ARRAY_SIZE(overrides)
  98
  99 #ifndef MODULE
 100
 101 /**
 102  *      internal_setup          -       handle lilo command string override
 103  *      @board: BOARD_* identifier for the board
 104  *      @str: unused
 105  *      @ints: numeric parameters
 106  *
 107  *      Do LILO command line initialization of the overrides array. Display
 108  *      errors when needed
 109  *
 110  *      Locks: none
 111  */
 112
 113 static void __init internal_setup(int board, char *str, int *ints)
 114 {
 115         static int commandline_current;
 116         switch (board) {
 117         case BOARD_NCR5380:
 118                 if (ints[0] != 2 && ints[0] != 3) {
 119                         printk(KERN_ERR "generic_NCR5380_setup : usage ncr5380=" STRVAL(NCR5380_map_name) ",irq,dma\n");
 120                         return;
 121                 }
 122                 break;
 123         case BOARD_NCR53C400:
 124                 if (ints[0] != 2) {
 125                         printk(KERN_ERR "generic_NCR53C400_setup : usage ncr53c400=" STRVAL(NCR5380_map_name) ",irq\n");
 126                         return;
 127                 }
 128                 break;
 129         case BOARD_NCR53C400A:
 130                 if (ints[0] != 2) {
 131                         printk(KERN_ERR "generic_NCR53C400A_setup : usage ncr53c400a=" STRVAL(NCR5380_map_name) ",irq\n");
 132                         return;
 133                 }
 134                 break;
 135         case BOARD_DTC3181E:
 136                 if (ints[0] != 2) {
 137                         printk("generic_DTC3181E_setup : usage dtc3181e=" STRVAL(NCR5380_map_name) ",irq\n");
 138                         return;
 139                 }
 140                 break;
 141         }
 142
 143         if (commandline_current < NO_OVERRIDES) {
 144                 overrides[commandline_current].NCR5380_map_name = (NCR5380_map_type) ints[1];
 145                 overrides[commandline_current].irq = ints[2];
 146                 if (ints[0] == 3)
 147                         overrides[commandline_current].dma = ints[3];
 148                 else
 149                         overrides[commandline_current].dma = DMA_NONE;
 150                 overrides[commandline_current].board = board;
 151                 ++commandline_current;
 152         }
 153 }
 154
 155
 156 /**
 157  *      do_NCR53C80_setup               -       set up entry point
 158  *      @str: unused
 159  *
 160  *      Setup function invoked at boot to parse the ncr5380= command
 161  *      line.
 162  */
 163
 164 static int __init do_NCR5380_setup(char *str)
 165 {
 166         int ints[10];
 167
 168         get_options(str, ARRAY_SIZE(ints), ints);
 169         internal_setup(BOARD_NCR5380, str, ints);
 170         return 1;
 171 }
 172
 173 /**
 174  *      do_NCR53C400_setup              -       set up entry point
 175  *      @str: unused
 176  *      @ints: integer parameters from kernel setup code
 177  *
 178  *      Setup function invoked at boot to parse the ncr53c400= command
 179  *      line.
 180  */
 181
 182 static int __init do_NCR53C400_setup(char *str)
 183 {
 184         int ints[10];
 185
 186         get_options(str, ARRAY_SIZE(ints), ints);
 187         internal_setup(BOARD_NCR53C400, str, ints);
 188         return 1;
 189 }
 190
 191 /**
 192  *      do_NCR53C400A_setup     -       set up entry point
 193  *      @str: unused
 194  *      @ints: integer parameters from kernel setup code
 195  *
 196  *      Setup function invoked at boot to parse the ncr53c400a= command
 197  *      line.
 198  */
 199
 200 static int __init do_NCR53C400A_setup(char *str)
 201 {
 202         int ints[10];
 203
 204         get_options(str, ARRAY_SIZE(ints), ints);
 205         internal_setup(BOARD_NCR53C400A, str, ints);
 206         return 1;
 207 }
 208
 209 /**
 210  *      do_DTC3181E_setup       -       set up entry point
 211  *      @str: unused
 212  *      @ints: integer parameters from kernel setup code
 213  *
 214  *      Setup function invoked at boot to parse the dtc3181e= command
 215  *      line.
 216  */
 217
 218 static int __init do_DTC3181E_setup(char *str)
 219 {
 220         int ints[10];
 221
 222         get_options(str, ARRAY_SIZE(ints), ints);
 223         internal_setup(BOARD_DTC3181E, str, ints);
 224         return 1;
 225 }
 226
 227 #endif
 228
 229 #ifndef SCSI_G_NCR5380_MEM
 230 /*
 231  * Configure I/O address of 53C400A or DTC436 by writing magic numbers
 232  * to ports 0x779 and 0x379.
 233  */
 234 static void magic_configure(int idx, u8 irq, u8 magic[])
 235 {
 236         u8 cfg = 0;
 237
 238         outb(magic[0], 0x779);
 239         outb(magic[1], 0x379);
 240         outb(magic[2], 0x379);
 241         outb(magic[3], 0x379);
 242         outb(magic[4], 0x379);
 243
 244         /* allowed IRQs for HP C2502 */
 245         if (irq != 2 && irq != 3 && irq != 4 && irq != 5 && irq != 7)
 246                 irq = 0;
 247         if (idx >= 0 && idx <= 7)
 248                 cfg = 0x80 | idx | (irq << 4);
 249         outb(cfg, 0x379);
 250 }
 251 #endif
 252
 253 /**
 254  *      generic_NCR5380_detect  -       look for NCR5380 controllers
 255  *      @tpnt: the scsi template
 256  *
 257  *      Scan for the present of NCR5380, NCR53C400, NCR53C400A, DTC3181E
 258  *      and DTC436(ISAPnP) controllers. If overrides have been set we use
 259  *      them.
 260  *
 261  *      Locks: none
 262  */
 263
 264 static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
 265 {
 266         static int current_override;
 267         int count;
 268         unsigned int *ports;
 269         u8 *magic = NULL;
 270 #ifndef SCSI_G_NCR5380_MEM
 271         int i;
 272         int port_idx = -1;
 273         unsigned long region_size = 16;
 274 #endif
 275         static unsigned int __initdata ncr_53c400a_ports[] = {
 276                 0x280, 0x290, 0x300, 0x310, 0x330, 0x340, 0x348, 0x350, 0
 277         };
 278         static unsigned int __initdata dtc_3181e_ports[] = {
 279                 0x220, 0x240, 0x280, 0x2a0, 0x2c0, 0x300, 0x320, 0x340, 0
 280         };
 281         static u8 ncr_53c400a_magic[] __initdata = {    /* 53C400A & DTC436 */
 282                 0x59, 0xb9, 0xc5, 0xae, 0xa6
 283         };
 284         static u8 hp_c2502_magic[] __initdata = {       /* HP C2502 */
 285                 0x0f, 0x22, 0xf0, 0x20, 0x80
 286         };
 287         int flags;
 288         struct Scsi_Host *instance;
 289         struct NCR5380_hostdata *hostdata;
 290 #ifdef SCSI_G_NCR5380_MEM
 291         unsigned long base;
 292         void __iomem *iomem;
 293 #endif
 294
 295         if (ncr_irq)
 296                 overrides[0].irq = ncr_irq;
 297         if (ncr_dma)
 298                 overrides[0].dma = ncr_dma;
 299         if (ncr_addr)
 300                 overrides[0].NCR5380_map_name = (NCR5380_map_type) ncr_addr;
 301         if (ncr_5380)
 302                 overrides[0].board = BOARD_NCR5380;
 303         else if (ncr_53c400)
 304                 overrides[0].board = BOARD_NCR53C400;
 305         else if (ncr_53c400a)
 306                 overrides[0].board = BOARD_NCR53C400A;
 307         else if (dtc_3181e)
 308                 overrides[0].board = BOARD_DTC3181E;
 309         else if (hp_c2502)
 310                 overrides[0].board = BOARD_HP_C2502;
 311 #ifndef SCSI_G_NCR5380_MEM
 312         if (!current_override && isapnp_present()) {
 313                 struct pnp_dev *dev = NULL;
 314                 count = 0;
 315                 while ((dev = pnp_find_dev(NULL, ISAPNP_VENDOR('D', 'T', 'C'), ISAPNP_FUNCTION(0x436e), dev))) {
 316                         if (count >= NO_OVERRIDES)
 317                                 break;
 318                         if (pnp_device_attach(dev) < 0)
 319                                 continue;
 320                         if (pnp_activate_dev(dev) < 0) {
 321                                 printk(KERN_ERR "dtc436e probe: activate failed\n");
 322                                 pnp_device_detach(dev);
 323                                 continue;
 324                         }
 325                         if (!pnp_port_valid(dev, 0)) {
 326                                 printk(KERN_ERR "dtc436e probe: no valid port\n");
 327                                 pnp_device_detach(dev);
 328                                 continue;
 329                         }
 330                         if (pnp_irq_valid(dev, 0))
 331                                 overrides[count].irq = pnp_irq(dev, 0);
 332                         else
 333                                 overrides[count].irq = NO_IRQ;
 334                         if (pnp_dma_valid(dev, 0))
 335                                 overrides[count].dma = pnp_dma(dev, 0);
 336                         else
 337                                 overrides[count].dma = DMA_NONE;
 338                         overrides[count].NCR5380_map_name = (NCR5380_map_type) pnp_port_start(dev, 0);
 339                         overrides[count].board = BOARD_DTC3181E;
 340                         count++;
 341                 }
 342         }
 343 #endif
 344
 345         for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
 346                 if (!(overrides[current_override].NCR5380_map_name))
 347                         continue;
 348
 349                 ports = NULL;
 350                 flags = 0;
 351                 switch (overrides[current_override].board) {
 352                 case BOARD_NCR5380:
 353                         flags = FLAG_NO_PSEUDO_DMA;
 354                         break;
 355                 case BOARD_NCR53C400:
 356 #ifdef PSEUDO_DMA
 357                         flags = FLAG_NO_DMA_FIXUP;
 358 #endif
 359                         break;
 360                 case BOARD_NCR53C400A:
 361                         flags = FLAG_NO_DMA_FIXUP;
 362                         ports = ncr_53c400a_ports;
 363                         magic = ncr_53c400a_magic;
 364                         break;
 365                 case BOARD_HP_C2502:
 366                         flags = FLAG_NO_DMA_FIXUP;
 367                         ports = ncr_53c400a_ports;
 368                         magic = hp_c2502_magic;
 369                         break;
 370                 case BOARD_DTC3181E:
 371                         flags = FLAG_NO_DMA_FIXUP;
 372                         ports = dtc_3181e_ports;
 373                         magic = ncr_53c400a_magic;
 374                         break;
 375                 }
 376
 377 #ifndef SCSI_G_NCR5380_MEM
 378                 if (ports && magic) {
 379                         /* wakeup sequence for the NCR53C400A and DTC3181E */
 380
 381                         /* Disable the adapter and look for a free io port */
 382                         magic_configure(-1, 0, magic);
 383
 384                         if (overrides[current_override].NCR5380_map_name != PORT_AUTO)
 385                                 for (i = 0; ports[i]; i++) {
 386                                         if (!request_region(ports[i],  16, "ncr53c80"))
 387                                                 continue;
 388                                         if (overrides[current_override].NCR5380_map_name == ports[i])
 389                                                 break;
 390                                         release_region(ports[i], 16);
 391                         } else
 392                                 for (i = 0; ports[i]; i++) {
 393                                         if (!request_region(ports[i],  16, "ncr53c80"))
 394                                                 continue;
 395                                         if (inb(ports[i]) == 0xff)
 396                                                 break;
 397                                         release_region(ports[i], 16);
 398                                 }
 399                         if (ports[i]) {
 400                                 /* At this point we have our region reserved */
 401                                 magic_configure(i, 0, magic); /* no IRQ yet */
 402                                 outb(0xc0, ports[i] + 9);
 403                                 if (inb(ports[i] + 9) != 0x80)
 404                                         continue;
 405                                 overrides[current_override].NCR5380_map_name = ports[i];
 406                                 port_idx = i;
 407                         } else
 408                                 continue;
 409                 }
 410                 else
 411                 {
 412                         /* Not a 53C400A style setup - just grab */
 413                         if(!(request_region(overrides[current_override].NCR5380_map_name, NCR5380_region_size, "ncr5380")))
 414                                 continue;
 415                         region_size = NCR5380_region_size;
 416                 }
 417 #else
 418                 base = overrides[current_override].NCR5380_map_name;
 419                 if (!request_mem_region(base, NCR5380_region_size, "ncr5380"))
 420                         continue;
 421                 iomem = ioremap(base, NCR5380_region_size);
 422                 if (!iomem) {
 423                         release_mem_region(base, NCR5380_region_size);
 424                         continue;
 425                 }
 426 #endif
 427                 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
 428                 if (instance == NULL)
 429                         goto out_release;
 430                 hostdata = shost_priv(instance);
 431
 432 #ifndef SCSI_G_NCR5380_MEM
 433                 instance->io_port = overrides[current_override].NCR5380_map_name;
 434                 instance->n_io_port = region_size;
 435                 hostdata->io_width = 1; /* 8-bit PDMA by default */
 436
 437                 /*
 438                  * On NCR53C400 boards, NCR5380 registers are mapped 8 past
 439                  * the base address.
 440                  */
 441                 switch (overrides[current_override].board) {
 442                 case BOARD_NCR53C400:
 443                         instance->io_port += 8;
 444                         hostdata->c400_ctl_status = 0;
 445                         hostdata->c400_blk_cnt = 1;
 446                         hostdata->c400_host_buf = 4;
 447                         break;
 448                 case BOARD_DTC3181E:
 449                         hostdata->io_width = 2; /* 16-bit PDMA */
 450                         /* fall through */
 451                 case BOARD_NCR53C400A:
 452                 case BOARD_HP_C2502:
 453                         hostdata->c400_ctl_status = 9;
 454                         hostdata->c400_blk_cnt = 10;
 455                         hostdata->c400_host_buf = 8;
 456                         break;
 457                 }
 458 #else
 459                 instance->base = overrides[current_override].NCR5380_map_name;
 460                 hostdata->iomem = iomem;
 461                 switch (overrides[current_override].board) {
 462                 case BOARD_NCR53C400:
 463                         hostdata->c400_ctl_status = 0x100;
 464                         hostdata->c400_blk_cnt = 0x101;
 465                         hostdata->c400_host_buf = 0x104;
 466                         break;
 467                 case BOARD_DTC3181E:
 468                 case BOARD_NCR53C400A:
 469                 case BOARD_HP_C2502:
 470                         pr_err(DRV_MODULE_NAME ": unknown register offsets\n");
 471                         goto out_unregister;
 472                 }
 473 #endif
 474
 475                 if (NCR5380_init(instance, flags))
 476                         goto out_unregister;
 477
 478                 switch (overrides[current_override].board) {
 479                 case BOARD_NCR53C400:
 480                 case BOARD_DTC3181E:
 481                 case BOARD_NCR53C400A:
 482                 case BOARD_HP_C2502:
 483                         NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
 484                 }
 485
 486                 NCR5380_maybe_reset_bus(instance);
 487
 488                 if (overrides[current_override].irq != IRQ_AUTO)
 489                         instance->irq = overrides[current_override].irq;
 490                 else
 491                         instance->irq = NCR5380_probe_irq(instance, 0xffff);
 492
 493                 /* Compatibility with documented NCR5380 kernel parameters */
 494                 if (instance->irq == 255)
 495                         instance->irq = NO_IRQ;
 496
 497                 if (instance->irq != NO_IRQ) {
 498 #ifndef SCSI_G_NCR5380_MEM
 499                         /* set IRQ for HP C2502 */
 500                         if (overrides[current_override].board == BOARD_HP_C2502)
 501                                 magic_configure(port_idx, instance->irq, magic);
 502 #endif
 503                         if (request_irq(instance->irq, generic_NCR5380_intr,
 504                                         0, "NCR5380", instance)) {
 505                                 printk(KERN_WARNING "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
 506                                 instance->irq = NO_IRQ;
 507                         }
 508                 }
 509
 510                 if (instance->irq == NO_IRQ) {
 511                         printk(KERN_INFO "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
 512                         printk(KERN_INFO "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
 513                 }
 514
 515                 ++current_override;
 516                 ++count;
 517         }
 518         return count;
 519
 520 out_unregister:
 521         scsi_unregister(instance);
 522 out_release:
 523 #ifndef SCSI_G_NCR5380_MEM
 524         release_region(overrides[current_override].NCR5380_map_name, region_size);
 525 #else
 526         iounmap(iomem);
 527         release_mem_region(base, NCR5380_region_size);
 528 #endif
 529         return count;
 530 }
 531
 532 /**
 533  *      generic_NCR5380_release_resources       -       free resources
 534  *      @instance: host adapter to clean up
 535  *
 536  *      Free the generic interface resources from this adapter.
 537  *
 538  *      Locks: none
 539  */
 540
 541 static int generic_NCR5380_release_resources(struct Scsi_Host *instance)
 542 {
 543         if (instance->irq != NO_IRQ)
 544                 free_irq(instance->irq, instance);
 545         NCR5380_exit(instance);
 546 #ifndef SCSI_G_NCR5380_MEM
 547         release_region(instance->io_port, instance->n_io_port);
 548 #else
 549         iounmap(((struct NCR5380_hostdata *)instance->hostdata)->iomem);
 550         release_mem_region(instance->base, NCR5380_region_size);
 551 #endif
 552         return 0;
 553 }
 554
 555 #ifdef BIOSPARAM
 556 /**
 557  *      generic_NCR5380_biosparam
 558  *      @disk: disk to compute geometry for
 559  *      @dev: device identifier for this disk
 560  *      @ip: sizes to fill in
 561  *
 562  *      Generates a BIOS / DOS compatible H-C-S mapping for the specified
 563  *      device / size.
 564  *
 565  *      XXX Most SCSI boards use this mapping, I could be incorrect.  Someone
 566  *      using hard disks on a trantor should verify that this mapping
 567  *      corresponds to that used by the BIOS / ASPI driver by running the linux
 568  *      fdisk program and matching the H_C_S coordinates to what DOS uses.
 569  *
 570  *      Locks: none
 571  */
 572
 573 static int
 574 generic_NCR5380_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 575                           sector_t capacity, int *ip)
 576 {
 577         ip[0] = 64;
 578         ip[1] = 32;
 579         ip[2] = capacity >> 11;
 580         return 0;
 581 }
 582 #endif
 583
 584 #ifdef PSEUDO_DMA
 585
 586 /**
 587  *      NCR5380_pread           -       pseudo DMA read
 588  *      @instance: adapter to read from
 589  *      @dst: buffer to read into
 590  *      @len: buffer length
 591  *
 592  *      Perform a pseudo DMA mode read from an NCR53C400 or equivalent
 593  *      controller
 594  */
 595
 596 static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
 597 {
 598         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 599         int blocks = len / 128;
 600         int start = 0;
 601
 602         NCR5380_write(hostdata->c400_ctl_status, CSR_BASE | CSR_TRANS_DIR);
 603         NCR5380_write(hostdata->c400_blk_cnt, blocks);
 604         while (1) {
 605                 if (NCR5380_read(hostdata->c400_blk_cnt) == 0)
 606                         break;
 607                 if (NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ) {
 608                         printk(KERN_ERR "53C400r: Got 53C80_IRQ start=%d, blocks=%d\n", start, blocks);
 609                         return -1;
 610                 }
 611                 while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
 612                         ; /* FIXME - no timeout */
 613
 614 #ifndef SCSI_G_NCR5380_MEM
 615                 if (hostdata->io_width == 2)
 616                         insw(instance->io_port + hostdata->c400_host_buf,
 617                                                         dst + start, 64);
 618                 else
 619                         insb(instance->io_port + hostdata->c400_host_buf,
 620                                                         dst + start, 128);
 621 #else
 622                 /* implies SCSI_G_NCR5380_MEM */
 623                 memcpy_fromio(dst + start,
 624                               hostdata->iomem + NCR53C400_host_buffer, 128);
 625 #endif
 626                 start += 128;
 627                 blocks--;
 628         }
 629
 630         if (blocks) {
 631                 while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
 632                         ; /* FIXME - no timeout */
 633
 634 #ifndef SCSI_G_NCR5380_MEM
 635                 if (hostdata->io_width == 2)
 636                         insw(instance->io_port + hostdata->c400_host_buf,
 637                                                         dst + start, 64);
 638                 else
 639                         insb(instance->io_port + hostdata->c400_host_buf,
 640                                                         dst + start, 128);
 641 #else
 642                 /* implies SCSI_G_NCR5380_MEM */
 643                 memcpy_fromio(dst + start,
 644                               hostdata->iomem + NCR53C400_host_buffer, 128);
 645 #endif
 646                 start += 128;
 647                 blocks--;
 648         }
 649
 650         if (!(NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ))
 651                 printk("53C400r: no 53C80 gated irq after transfer");
 652
 653         /* wait for 53C80 registers to be available */
 654         while (!(NCR5380_read(hostdata->c400_ctl_status) & CSR_53C80_REG))
 655                 ;
 656
 657         if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_END_DMA_TRANSFER))
 658                 printk(KERN_ERR "53C400r: no end dma signal\n");
 659
 660         return 0;
 661 }
 662
 663 /**
 664  *      NCR5380_write           -       pseudo DMA write
 665  *      @instance: adapter to read from
 666  *      @dst: buffer to read into
 667  *      @len: buffer length
 668  *
 669  *      Perform a pseudo DMA mode read from an NCR53C400 or equivalent
 670  *      controller
 671  */
 672
 673 static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
 674 {
 675         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 676         int blocks = len / 128;
 677         int start = 0;
 678
 679         NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
 680         NCR5380_write(hostdata->c400_blk_cnt, blocks);
 681         while (1) {
 682                 if (NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ) {
 683                         printk(KERN_ERR "53C400w: Got 53C80_IRQ start=%d, blocks=%d\n", start, blocks);
 684                         return -1;
 685                 }
 686
 687                 if (NCR5380_read(hostdata->c400_blk_cnt) == 0)
 688                         break;
 689                 while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
 690                         ; // FIXME - timeout
 691 #ifndef SCSI_G_NCR5380_MEM
 692                 if (hostdata->io_width == 2)
 693                         outsw(instance->io_port + hostdata->c400_host_buf,
 694                                                         src + start, 64);
 695                 else
 696                         outsb(instance->io_port + hostdata->c400_host_buf,
 697                                                         src + start, 128);
 698 #else
 699                 /* implies SCSI_G_NCR5380_MEM */
 700                 memcpy_toio(hostdata->iomem + NCR53C400_host_buffer,
 701                             src + start, 128);
 702 #endif
 703                 start += 128;
 704                 blocks--;
 705         }
 706         if (blocks) {
 707                 while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
 708                         ; // FIXME - no timeout
 709
 710 #ifndef SCSI_G_NCR5380_MEM
 711                 if (hostdata->io_width == 2)
 712                         outsw(instance->io_port + hostdata->c400_host_buf,
 713                                                         src + start, 64);
 714                 else
 715                         outsb(instance->io_port + hostdata->c400_host_buf,
 716                                                         src + start, 128);
 717 #else
 718                 /* implies SCSI_G_NCR5380_MEM */
 719                 memcpy_toio(hostdata->iomem + NCR53C400_host_buffer,
 720                             src + start, 128);
 721 #endif
 722                 start += 128;
 723                 blocks--;
 724         }
 725
 726         /* wait for 53C80 registers to be available */
 727         while (!(NCR5380_read(hostdata->c400_ctl_status) & CSR_53C80_REG)) {
 728                 udelay(4); /* DTC436 chip hangs without this */
 729                 /* FIXME - no timeout */
 730         }
 731
 732         if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_END_DMA_TRANSFER)) {
 733                 printk(KERN_ERR "53C400w: no end dma signal\n");
 734         }
 735
 736         while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
 737                 ;       // TIMEOUT
 738         return 0;
 739 }
 740
 741 static int generic_NCR5380_dma_xfer_len(struct scsi_cmnd *cmd)
 742 {
 743         int transfersize = cmd->transfersize;
 744
 745         /* Limit transfers to 32K, for xx400 & xx406
 746          * pseudoDMA that transfers in 128 bytes blocks.
 747          */
 748         if (transfersize > 32 * 1024 && cmd->SCp.this_residual &&
 749             !(cmd->SCp.this_residual % transfersize))
 750                 transfersize = 32 * 1024;
 751
 752         /* 53C400 datasheet: non-modulo-128-byte transfers should use PIO */
 753         if (transfersize % 128)
 754                 transfersize = 0;
 755
 756         return transfersize;
 757 }
 758
 759 #endif /* PSEUDO_DMA */
 760
 761 /*
 762  *      Include the NCR5380 core code that we build our driver around
 763  */
 764
 765 #include "NCR5380.c"
 766
 767 static struct scsi_host_template driver_template = {
 768         .proc_name              = DRV_MODULE_NAME,
 769         .name                   = "Generic NCR5380/NCR53C400 SCSI",
 770         .detect                 = generic_NCR5380_detect,
 771         .release                = generic_NCR5380_release_resources,
 772         .info                   = generic_NCR5380_info,
 773         .queuecommand           = generic_NCR5380_queue_command,
 774         .eh_abort_handler       = generic_NCR5380_abort,
 775         .eh_bus_reset_handler   = generic_NCR5380_bus_reset,
 776         .bios_param             = NCR5380_BIOSPARAM,
 777         .can_queue              = 16,
 778         .this_id                = 7,
 779         .sg_tablesize           = SG_ALL,
 780         .cmd_per_lun            = 2,
 781         .use_clustering         = DISABLE_CLUSTERING,
 782         .cmd_size               = NCR5380_CMD_SIZE,
 783         .max_sectors            = 128,
 784 };
 785
 786 #include "scsi_module.c"
 787
 788 module_param(ncr_irq, int, 0);
 789 module_param(ncr_dma, int, 0);
 790 module_param(ncr_addr, int, 0);
 791 module_param(ncr_5380, int, 0);
 792 module_param(ncr_53c400, int, 0);
 793 module_param(ncr_53c400a, int, 0);
 794 module_param(dtc_3181e, int, 0);
 795 module_param(hp_c2502, int, 0);
 796 MODULE_LICENSE("GPL");
 797
 798 #if !defined(SCSI_G_NCR5380_MEM) && defined(MODULE)
 799 static struct isapnp_device_id id_table[] = {
 800         {
 801          ISAPNP_ANY_ID, ISAPNP_ANY_ID,
 802          ISAPNP_VENDOR('D', 'T', 'C'), ISAPNP_FUNCTION(0x436e),
 803          0},
 804         {0}
 805 };
 806
 807 MODULE_DEVICE_TABLE(isapnp, id_table);
 808 #endif
 809
 810 __setup("ncr5380=", do_NCR5380_setup);
 811 __setup("ncr53c400=", do_NCR53C400_setup);
 812 __setup("ncr53c400a=", do_NCR53C400A_setup);
 813 __setup("dtc3181e=", do_DTC3181E_setup);