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/signal.h>
  67 #include <linux/blkdev.h>
  68 #include <scsi/scsi_host.h>
  69 #include "g_NCR5380.h"
  70 #include "NCR5380.h"
  71 #include <linux/stat.h>
  72 #include <linux/init.h>
  73 #include <linux/ioport.h>
  74 #include <linux/isapnp.h>
  75 #include <linux/delay.h>
  76 #include <linux/interrupt.h>
  77
  78 static int ncr_irq;
  79 static int ncr_dma;
  80 static int ncr_addr;
  81 static int ncr_5380;
  82 static int ncr_53c400;
  83 static int ncr_53c400a;
  84 static int dtc_3181e;
  85
  86 static struct override {
  87         NCR5380_map_type NCR5380_map_name;
  88         int irq;
  89         int dma;
  90         int board;              /* Use NCR53c400, Ricoh, etc. extensions ? */
  91 } overrides
  92 #ifdef GENERIC_NCR5380_OVERRIDE
  93 [] __initdata = GENERIC_NCR5380_OVERRIDE;
  94 #else
  95 [1] __initdata = { { 0,},};
  96 #endif
  97
  98 #define NO_OVERRIDES ARRAY_SIZE(overrides)
  99
 100 #ifndef MODULE
 101
 102 /**
 103  *      internal_setup          -       handle lilo command string override
 104  *      @board: BOARD_* identifier for the board
 105  *      @str: unused
 106  *      @ints: numeric parameters
 107  *
 108  *      Do LILO command line initialization of the overrides array. Display
 109  *      errors when needed
 110  *
 111  *      Locks: none
 112  */
 113
 114 static void __init internal_setup(int board, char *str, int *ints)
 115 {
 116         static int commandline_current;
 117         switch (board) {
 118         case BOARD_NCR5380:
 119                 if (ints[0] != 2 && ints[0] != 3) {
 120                         printk(KERN_ERR "generic_NCR5380_setup : usage ncr5380=" STRVAL(NCR5380_map_name) ",irq,dma\n");
 121                         return;
 122                 }
 123                 break;
 124         case BOARD_NCR53C400:
 125                 if (ints[0] != 2) {
 126                         printk(KERN_ERR "generic_NCR53C400_setup : usage ncr53c400=" STRVAL(NCR5380_map_name) ",irq\n");
 127                         return;
 128                 }
 129                 break;
 130         case BOARD_NCR53C400A:
 131                 if (ints[0] != 2) {
 132                         printk(KERN_ERR "generic_NCR53C400A_setup : usage ncr53c400a=" STRVAL(NCR5380_map_name) ",irq\n");
 133                         return;
 134                 }
 135                 break;
 136         case BOARD_DTC3181E:
 137                 if (ints[0] != 2) {
 138                         printk("generic_DTC3181E_setup : usage dtc3181e=" STRVAL(NCR5380_map_name) ",irq\n");
 139                         return;
 140                 }
 141                 break;
 142         }
 143
 144         if (commandline_current < NO_OVERRIDES) {
 145                 overrides[commandline_current].NCR5380_map_name = (NCR5380_map_type) ints[1];
 146                 overrides[commandline_current].irq = ints[2];
 147                 if (ints[0] == 3)
 148                         overrides[commandline_current].dma = ints[3];
 149                 else
 150                         overrides[commandline_current].dma = DMA_NONE;
 151                 overrides[commandline_current].board = board;
 152                 ++commandline_current;
 153         }
 154 }
 155
 156
 157 /**
 158  *      do_NCR53C80_setup               -       set up entry point
 159  *      @str: unused
 160  *
 161  *      Setup function invoked at boot to parse the ncr5380= command
 162  *      line.
 163  */
 164
 165 static int __init do_NCR5380_setup(char *str)
 166 {
 167         int ints[10];
 168
 169         get_options(str, ARRAY_SIZE(ints), ints);
 170         internal_setup(BOARD_NCR5380, str, ints);
 171         return 1;
 172 }
 173
 174 /**
 175  *      do_NCR53C400_setup              -       set up entry point
 176  *      @str: unused
 177  *      @ints: integer parameters from kernel setup code
 178  *
 179  *      Setup function invoked at boot to parse the ncr53c400= command
 180  *      line.
 181  */
 182
 183 static int __init do_NCR53C400_setup(char *str)
 184 {
 185         int ints[10];
 186
 187         get_options(str, ARRAY_SIZE(ints), ints);
 188         internal_setup(BOARD_NCR53C400, str, ints);
 189         return 1;
 190 }
 191
 192 /**
 193  *      do_NCR53C400A_setup     -       set up entry point
 194  *      @str: unused
 195  *      @ints: integer parameters from kernel setup code
 196  *
 197  *      Setup function invoked at boot to parse the ncr53c400a= command
 198  *      line.
 199  */
 200
 201 static int __init do_NCR53C400A_setup(char *str)
 202 {
 203         int ints[10];
 204
 205         get_options(str, ARRAY_SIZE(ints), ints);
 206         internal_setup(BOARD_NCR53C400A, str, ints);
 207         return 1;
 208 }
 209
 210 /**
 211  *      do_DTC3181E_setup       -       set up entry point
 212  *      @str: unused
 213  *      @ints: integer parameters from kernel setup code
 214  *
 215  *      Setup function invoked at boot to parse the dtc3181e= command
 216  *      line.
 217  */
 218
 219 static int __init do_DTC3181E_setup(char *str)
 220 {
 221         int ints[10];
 222
 223         get_options(str, ARRAY_SIZE(ints), ints);
 224         internal_setup(BOARD_DTC3181E, str, ints);
 225         return 1;
 226 }
 227
 228 #endif
 229
 230 /**
 231  *      generic_NCR5380_detect  -       look for NCR5380 controllers
 232  *      @tpnt: the scsi template
 233  *
 234  *      Scan for the present of NCR5380, NCR53C400, NCR53C400A, DTC3181E
 235  *      and DTC436(ISAPnP) controllers. If overrides have been set we use
 236  *      them.
 237  *
 238  *      Locks: none
 239  */
 240
 241 static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
 242 {
 243         static int current_override;
 244         int count;
 245         unsigned int *ports;
 246 #ifndef SCSI_G_NCR5380_MEM
 247         int i;
 248         unsigned long region_size = 16;
 249 #endif
 250         static unsigned int __initdata ncr_53c400a_ports[] = {
 251                 0x280, 0x290, 0x300, 0x310, 0x330, 0x340, 0x348, 0x350, 0
 252         };
 253         static unsigned int __initdata dtc_3181e_ports[] = {
 254                 0x220, 0x240, 0x280, 0x2a0, 0x2c0, 0x300, 0x320, 0x340, 0
 255         };
 256         int flags;
 257         struct Scsi_Host *instance;
 258 #ifdef SCSI_G_NCR5380_MEM
 259         unsigned long base;
 260         void __iomem *iomem;
 261 #endif
 262
 263         if (ncr_irq)
 264                 overrides[0].irq = ncr_irq;
 265         if (ncr_dma)
 266                 overrides[0].dma = ncr_dma;
 267         if (ncr_addr)
 268                 overrides[0].NCR5380_map_name = (NCR5380_map_type) ncr_addr;
 269         if (ncr_5380)
 270                 overrides[0].board = BOARD_NCR5380;
 271         else if (ncr_53c400)
 272                 overrides[0].board = BOARD_NCR53C400;
 273         else if (ncr_53c400a)
 274                 overrides[0].board = BOARD_NCR53C400A;
 275         else if (dtc_3181e)
 276                 overrides[0].board = BOARD_DTC3181E;
 277 #ifndef SCSI_G_NCR5380_MEM
 278         if (!current_override && isapnp_present()) {
 279                 struct pnp_dev *dev = NULL;
 280                 count = 0;
 281                 while ((dev = pnp_find_dev(NULL, ISAPNP_VENDOR('D', 'T', 'C'), ISAPNP_FUNCTION(0x436e), dev))) {
 282                         if (count >= NO_OVERRIDES)
 283                                 break;
 284                         if (pnp_device_attach(dev) < 0)
 285                                 continue;
 286                         if (pnp_activate_dev(dev) < 0) {
 287                                 printk(KERN_ERR "dtc436e probe: activate failed\n");
 288                                 pnp_device_detach(dev);
 289                                 continue;
 290                         }
 291                         if (!pnp_port_valid(dev, 0)) {
 292                                 printk(KERN_ERR "dtc436e probe: no valid port\n");
 293                                 pnp_device_detach(dev);
 294                                 continue;
 295                         }
 296                         if (pnp_irq_valid(dev, 0))
 297                                 overrides[count].irq = pnp_irq(dev, 0);
 298                         else
 299                                 overrides[count].irq = NO_IRQ;
 300                         if (pnp_dma_valid(dev, 0))
 301                                 overrides[count].dma = pnp_dma(dev, 0);
 302                         else
 303                                 overrides[count].dma = DMA_NONE;
 304                         overrides[count].NCR5380_map_name = (NCR5380_map_type) pnp_port_start(dev, 0);
 305                         overrides[count].board = BOARD_DTC3181E;
 306                         count++;
 307                 }
 308         }
 309 #endif
 310         tpnt->proc_name = "g_NCR5380";
 311
 312         for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
 313                 if (!(overrides[current_override].NCR5380_map_name))
 314                         continue;
 315
 316                 ports = NULL;
 317                 flags = 0;
 318                 switch (overrides[current_override].board) {
 319                 case BOARD_NCR5380:
 320                         flags = FLAG_NO_PSEUDO_DMA;
 321                         break;
 322                 case BOARD_NCR53C400:
 323 #ifdef PSEUDO_DMA
 324                         flags = FLAG_NCR53C400;
 325 #endif
 326                         break;
 327                 case BOARD_NCR53C400A:
 328                         flags = FLAG_NO_PSEUDO_DMA;
 329                         ports = ncr_53c400a_ports;
 330                         break;
 331                 case BOARD_DTC3181E:
 332                         flags = FLAG_NO_PSEUDO_DMA | FLAG_DTC3181E;
 333                         ports = dtc_3181e_ports;
 334                         break;
 335                 }
 336
 337 #ifndef SCSI_G_NCR5380_MEM
 338                 if (ports) {
 339                         /* wakeup sequence for the NCR53C400A and DTC3181E */
 340
 341                         /* Disable the adapter and look for a free io port */
 342                         outb(0x59, 0x779);
 343                         outb(0xb9, 0x379);
 344                         outb(0xc5, 0x379);
 345                         outb(0xae, 0x379);
 346                         outb(0xa6, 0x379);
 347                         outb(0x00, 0x379);
 348
 349                         if (overrides[current_override].NCR5380_map_name != PORT_AUTO)
 350                                 for (i = 0; ports[i]; i++) {
 351                                         if (!request_region(ports[i],  16, "ncr53c80"))
 352                                                 continue;
 353                                         if (overrides[current_override].NCR5380_map_name == ports[i])
 354                                                 break;
 355                                         release_region(ports[i], 16);
 356                         } else
 357                                 for (i = 0; ports[i]; i++) {
 358                                         if (!request_region(ports[i],  16, "ncr53c80"))
 359                                                 continue;
 360                                         if (inb(ports[i]) == 0xff)
 361                                                 break;
 362                                         release_region(ports[i], 16);
 363                                 }
 364                         if (ports[i]) {
 365                                 /* At this point we have our region reserved */
 366                                 outb(0x59, 0x779);
 367                                 outb(0xb9, 0x379);
 368                                 outb(0xc5, 0x379);
 369                                 outb(0xae, 0x379);
 370                                 outb(0xa6, 0x379);
 371                                 outb(0x80 | i, 0x379);  /* set io port to be used */
 372                                 outb(0xc0, ports[i] + 9);
 373                                 if (inb(ports[i] + 9) != 0x80)
 374                                         continue;
 375                                 else
 376                                         overrides[current_override].NCR5380_map_name = ports[i];
 377                         } else
 378                                 continue;
 379                 }
 380                 else
 381                 {
 382                         /* Not a 53C400A style setup - just grab */
 383                         if(!(request_region(overrides[current_override].NCR5380_map_name, NCR5380_region_size, "ncr5380")))
 384                                 continue;
 385                         region_size = NCR5380_region_size;
 386                 }
 387 #else
 388                 base = overrides[current_override].NCR5380_map_name;
 389                 if (!request_mem_region(base, NCR5380_region_size, "ncr5380"))
 390                         continue;
 391                 iomem = ioremap(base, NCR5380_region_size);
 392                 if (!iomem) {
 393                         release_mem_region(base, NCR5380_region_size);
 394                         continue;
 395                 }
 396 #endif
 397                 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
 398                 if (instance == NULL)
 399                         goto out_release;
 400
 401 #ifndef SCSI_G_NCR5380_MEM
 402                 instance->io_port = overrides[current_override].NCR5380_map_name;
 403                 instance->n_io_port = region_size;
 404
 405                 /*
 406                  * On NCR53C400 boards, NCR5380 registers are mapped 8 past
 407                  * the base address.
 408                  */
 409                 if (overrides[current_override].board == BOARD_NCR53C400)
 410                         instance->io_port += 8;
 411 #else
 412                 instance->base = overrides[current_override].NCR5380_map_name;
 413                 ((struct NCR5380_hostdata *)instance->hostdata)->iomem = iomem;
 414 #endif
 415
 416                 if (NCR5380_init(instance, flags))
 417                         goto out_unregister;
 418
 419                 if (overrides[current_override].board == BOARD_NCR53C400)
 420                         NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
 421
 422                 NCR5380_maybe_reset_bus(instance);
 423
 424                 if (overrides[current_override].irq != IRQ_AUTO)
 425                         instance->irq = overrides[current_override].irq;
 426                 else
 427                         instance->irq = NCR5380_probe_irq(instance, 0xffff);
 428
 429                 /* Compatibility with documented NCR5380 kernel parameters */
 430                 if (instance->irq == 255)
 431                         instance->irq = NO_IRQ;
 432
 433                 if (instance->irq != NO_IRQ)
 434                         if (request_irq(instance->irq, generic_NCR5380_intr,
 435                                         0, "NCR5380", instance)) {
 436                                 printk(KERN_WARNING "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
 437                                 instance->irq = NO_IRQ;
 438                         }
 439
 440                 if (instance->irq == NO_IRQ) {
 441                         printk(KERN_INFO "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
 442                         printk(KERN_INFO "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
 443                 }
 444
 445                 ++current_override;
 446                 ++count;
 447         }
 448         return count;
 449
 450 out_unregister:
 451         scsi_unregister(instance);
 452 out_release:
 453 #ifndef SCSI_G_NCR5380_MEM
 454         release_region(overrides[current_override].NCR5380_map_name, region_size);
 455 #else
 456         iounmap(iomem);
 457         release_mem_region(base, NCR5380_region_size);
 458 #endif
 459         return count;
 460 }
 461
 462 /**
 463  *      generic_NCR5380_release_resources       -       free resources
 464  *      @instance: host adapter to clean up
 465  *
 466  *      Free the generic interface resources from this adapter.
 467  *
 468  *      Locks: none
 469  */
 470
 471 static int generic_NCR5380_release_resources(struct Scsi_Host *instance)
 472 {
 473         if (instance->irq != NO_IRQ)
 474                 free_irq(instance->irq, instance);
 475         NCR5380_exit(instance);
 476 #ifndef SCSI_G_NCR5380_MEM
 477         release_region(instance->io_port, instance->n_io_port);
 478 #else
 479         iounmap(((struct NCR5380_hostdata *)instance->hostdata)->iomem);
 480         release_mem_region(instance->base, NCR5380_region_size);
 481 #endif
 482         return 0;
 483 }
 484
 485 #ifdef BIOSPARAM
 486 /**
 487  *      generic_NCR5380_biosparam
 488  *      @disk: disk to compute geometry for
 489  *      @dev: device identifier for this disk
 490  *      @ip: sizes to fill in
 491  *
 492  *      Generates a BIOS / DOS compatible H-C-S mapping for the specified
 493  *      device / size.
 494  *
 495  *      XXX Most SCSI boards use this mapping, I could be incorrect.  Someone
 496  *      using hard disks on a trantor should verify that this mapping
 497  *      corresponds to that used by the BIOS / ASPI driver by running the linux
 498  *      fdisk program and matching the H_C_S coordinates to what DOS uses.
 499  *
 500  *      Locks: none
 501  */
 502
 503 static int
 504 generic_NCR5380_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 505                           sector_t capacity, int *ip)
 506 {
 507         ip[0] = 64;
 508         ip[1] = 32;
 509         ip[2] = capacity >> 11;
 510         return 0;
 511 }
 512 #endif
 513
 514 #ifdef PSEUDO_DMA
 515
 516 /**
 517  *      NCR5380_pread           -       pseudo DMA read
 518  *      @instance: adapter to read from
 519  *      @dst: buffer to read into
 520  *      @len: buffer length
 521  *
 522  *      Perform a pseudo DMA mode read from an NCR53C400 or equivalent
 523  *      controller
 524  */
 525
 526 static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
 527 {
 528 #ifdef SCSI_G_NCR5380_MEM
 529         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 530 #endif
 531         int blocks = len / 128;
 532         int start = 0;
 533         int bl;
 534
 535         NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE | CSR_TRANS_DIR);
 536         NCR5380_write(C400_BLOCK_COUNTER_REG, blocks);
 537         while (1) {
 538                 if ((bl = NCR5380_read(C400_BLOCK_COUNTER_REG)) == 0) {
 539                         break;
 540                 }
 541                 if (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_GATED_53C80_IRQ) {
 542                         printk(KERN_ERR "53C400r: Got 53C80_IRQ start=%d, blocks=%d\n", start, blocks);
 543                         return -1;
 544                 }
 545                 while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_HOST_BUF_NOT_RDY);
 546
 547 #ifndef SCSI_G_NCR5380_MEM
 548                 {
 549                         int i;
 550                         for (i = 0; i < 128; i++)
 551                                 dst[start + i] = NCR5380_read(C400_HOST_BUFFER);
 552                 }
 553 #else
 554                 /* implies SCSI_G_NCR5380_MEM */
 555                 memcpy_fromio(dst + start,
 556                               hostdata->iomem + NCR53C400_host_buffer, 128);
 557 #endif
 558                 start += 128;
 559                 blocks--;
 560         }
 561
 562         if (blocks) {
 563                 while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_HOST_BUF_NOT_RDY)
 564                 {
 565                         // FIXME - no timeout
 566                 }
 567
 568 #ifndef SCSI_G_NCR5380_MEM
 569                 {
 570                         int i;
 571                         for (i = 0; i < 128; i++)
 572                                 dst[start + i] = NCR5380_read(C400_HOST_BUFFER);
 573                 }
 574 #else
 575                 /* implies SCSI_G_NCR5380_MEM */
 576                 memcpy_fromio(dst + start,
 577                               hostdata->iomem + NCR53C400_host_buffer, 128);
 578 #endif
 579                 start += 128;
 580                 blocks--;
 581         }
 582
 583         if (!(NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_GATED_53C80_IRQ))
 584                 printk("53C400r: no 53C80 gated irq after transfer");
 585
 586 #if 0
 587         /*
 588          *      DON'T DO THIS - THEY NEVER ARRIVE!
 589          */
 590         printk("53C400r: Waiting for 53C80 registers\n");
 591         while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_53C80_REG)
 592                 ;
 593 #endif
 594         if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_END_DMA_TRANSFER))
 595                 printk(KERN_ERR "53C400r: no end dma signal\n");
 596
 597         NCR5380_write(MODE_REG, MR_BASE);
 598         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 599         return 0;
 600 }
 601
 602 /**
 603  *      NCR5380_write           -       pseudo DMA write
 604  *      @instance: adapter to read from
 605  *      @dst: buffer to read into
 606  *      @len: buffer length
 607  *
 608  *      Perform a pseudo DMA mode read from an NCR53C400 or equivalent
 609  *      controller
 610  */
 611
 612 static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
 613 {
 614 #ifdef SCSI_G_NCR5380_MEM
 615         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 616 #endif
 617         int blocks = len / 128;
 618         int start = 0;
 619         int bl;
 620         int i;
 621
 622         NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
 623         NCR5380_write(C400_BLOCK_COUNTER_REG, blocks);
 624         while (1) {
 625                 if (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_GATED_53C80_IRQ) {
 626                         printk(KERN_ERR "53C400w: Got 53C80_IRQ start=%d, blocks=%d\n", start, blocks);
 627                         return -1;
 628                 }
 629
 630                 if ((bl = NCR5380_read(C400_BLOCK_COUNTER_REG)) == 0) {
 631                         break;
 632                 }
 633                 while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_HOST_BUF_NOT_RDY)
 634                         ; // FIXME - timeout
 635 #ifndef SCSI_G_NCR5380_MEM
 636                 {
 637                         for (i = 0; i < 128; i++)
 638                                 NCR5380_write(C400_HOST_BUFFER, src[start + i]);
 639                 }
 640 #else
 641                 /* implies SCSI_G_NCR5380_MEM */
 642                 memcpy_toio(hostdata->iomem + NCR53C400_host_buffer,
 643                             src + start, 128);
 644 #endif
 645                 start += 128;
 646                 blocks--;
 647         }
 648         if (blocks) {
 649                 while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_HOST_BUF_NOT_RDY)
 650                         ; // FIXME - no timeout
 651
 652 #ifndef SCSI_G_NCR5380_MEM
 653                 {
 654                         for (i = 0; i < 128; i++)
 655                                 NCR5380_write(C400_HOST_BUFFER, src[start + i]);
 656                 }
 657 #else
 658                 /* implies SCSI_G_NCR5380_MEM */
 659                 memcpy_toio(hostdata->iomem + NCR53C400_host_buffer,
 660                             src + start, 128);
 661 #endif
 662                 start += 128;
 663                 blocks--;
 664         }
 665
 666 #if 0
 667         printk("53C400w: waiting for registers to be available\n");
 668         THEY NEVER DO ! while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_53C80_REG);
 669         printk("53C400w: Got em\n");
 670 #endif
 671
 672         /* Let's wait for this instead - could be ugly */
 673         /* All documentation says to check for this. Maybe my hardware is too
 674          * fast. Waiting for it seems to work fine! KLL
 675          */
 676         while (!(i = NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_GATED_53C80_IRQ))
 677                 ;       // FIXME - no timeout
 678
 679         /*
 680          * I know. i is certainly != 0 here but the loop is new. See previous
 681          * comment.
 682          */
 683         if (i) {
 684                 if (!((i = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_END_DMA_TRANSFER))
 685                         printk(KERN_ERR "53C400w: No END OF DMA bit - WHOOPS! BASR=%0x\n", i);
 686         } else
 687                 printk(KERN_ERR "53C400w: no 53C80 gated irq after transfer (last block)\n");
 688
 689 #if 0
 690         if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_END_DMA_TRANSFER)) {
 691                 printk(KERN_ERR "53C400w: no end dma signal\n");
 692         }
 693 #endif
 694         while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
 695                 ;       // TIMEOUT
 696         return 0;
 697 }
 698
 699 static int generic_NCR5380_dma_xfer_len(struct scsi_cmnd *cmd)
 700 {
 701         int transfersize = cmd->transfersize;
 702
 703         /* Limit transfers to 32K, for xx400 & xx406
 704          * pseudoDMA that transfers in 128 bytes blocks.
 705          */
 706         if (transfersize > 32 * 1024 && cmd->SCp.this_residual &&
 707             !(cmd->SCp.this_residual % transfersize))
 708                 transfersize = 32 * 1024;
 709
 710         return transfersize;
 711 }
 712
 713 #endif /* PSEUDO_DMA */
 714
 715 /*
 716  *      Include the NCR5380 core code that we build our driver around
 717  */
 718
 719 #include "NCR5380.c"
 720
 721 static struct scsi_host_template driver_template = {
 722         .show_info              = generic_NCR5380_show_info,
 723         .name                   = "Generic NCR5380/NCR53C400 SCSI",
 724         .detect                 = generic_NCR5380_detect,
 725         .release                = generic_NCR5380_release_resources,
 726         .info                   = generic_NCR5380_info,
 727         .queuecommand           = generic_NCR5380_queue_command,
 728         .eh_abort_handler       = generic_NCR5380_abort,
 729         .eh_bus_reset_handler   = generic_NCR5380_bus_reset,
 730         .bios_param             = NCR5380_BIOSPARAM,
 731         .can_queue              = CAN_QUEUE,
 732         .this_id                = 7,
 733         .sg_tablesize           = SG_ALL,
 734         .cmd_per_lun            = CMD_PER_LUN,
 735         .use_clustering         = DISABLE_CLUSTERING,
 736 };
 737 #include <linux/module.h>
 738 #include "scsi_module.c"
 739
 740 module_param(ncr_irq, int, 0);
 741 module_param(ncr_dma, int, 0);
 742 module_param(ncr_addr, int, 0);
 743 module_param(ncr_5380, int, 0);
 744 module_param(ncr_53c400, int, 0);
 745 module_param(ncr_53c400a, int, 0);
 746 module_param(dtc_3181e, int, 0);
 747 MODULE_LICENSE("GPL");
 748
 749 #if !defined(SCSI_G_NCR5380_MEM) && defined(MODULE)
 750 static struct isapnp_device_id id_table[] = {
 751         {
 752          ISAPNP_ANY_ID, ISAPNP_ANY_ID,
 753          ISAPNP_VENDOR('D', 'T', 'C'), ISAPNP_FUNCTION(0x436e),
 754          0},
 755         {0}
 756 };
 757
 758 MODULE_DEVICE_TABLE(isapnp, id_table);
 759 #endif
 760
 761 __setup("ncr5380=", do_NCR5380_setup);
 762 __setup("ncr53c400=", do_NCR53C400_setup);
 763 __setup("ncr53c400a=", do_NCR53C400A_setup);
 764 __setup("dtc3181e=", do_DTC3181E_setup);