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
  84 static struct override {
  85         NCR5380_map_type NCR5380_map_name;
  86         int irq;
  87         int dma;
  88         int board;              /* Use NCR53c400, Ricoh, etc. extensions ? */
  89 } overrides
  90 #ifdef GENERIC_NCR5380_OVERRIDE
  91 [] __initdata = GENERIC_NCR5380_OVERRIDE;
  92 #else
  93 [1] __initdata = { { 0,},};
  94 #endif
  95
  96 #define NO_OVERRIDES ARRAY_SIZE(overrides)
  97
  98 #ifndef MODULE
  99
 100 /**
 101  *      internal_setup          -       handle lilo command string override
 102  *      @board: BOARD_* identifier for the board
 103  *      @str: unused
 104  *      @ints: numeric parameters
 105  *
 106  *      Do LILO command line initialization of the overrides array. Display
 107  *      errors when needed
 108  *
 109  *      Locks: none
 110  */
 111
 112 static void __init internal_setup(int board, char *str, int *ints)
 113 {
 114         static int commandline_current;
 115         switch (board) {
 116         case BOARD_NCR5380:
 117                 if (ints[0] != 2 && ints[0] != 3) {
 118                         printk(KERN_ERR "generic_NCR5380_setup : usage ncr5380=" STRVAL(NCR5380_map_name) ",irq,dma\n");
 119                         return;
 120                 }
 121                 break;
 122         case BOARD_NCR53C400:
 123                 if (ints[0] != 2) {
 124                         printk(KERN_ERR "generic_NCR53C400_setup : usage ncr53c400=" STRVAL(NCR5380_map_name) ",irq\n");
 125                         return;
 126                 }
 127                 break;
 128         case BOARD_NCR53C400A:
 129                 if (ints[0] != 2) {
 130                         printk(KERN_ERR "generic_NCR53C400A_setup : usage ncr53c400a=" STRVAL(NCR5380_map_name) ",irq\n");
 131                         return;
 132                 }
 133                 break;
 134         case BOARD_DTC3181E:
 135                 if (ints[0] != 2) {
 136                         printk("generic_DTC3181E_setup : usage dtc3181e=" STRVAL(NCR5380_map_name) ",irq\n");
 137                         return;
 138                 }
 139                 break;
 140         }
 141
 142         if (commandline_current < NO_OVERRIDES) {
 143                 overrides[commandline_current].NCR5380_map_name = (NCR5380_map_type) ints[1];
 144                 overrides[commandline_current].irq = ints[2];
 145                 if (ints[0] == 3)
 146                         overrides[commandline_current].dma = ints[3];
 147                 else
 148                         overrides[commandline_current].dma = DMA_NONE;
 149                 overrides[commandline_current].board = board;
 150                 ++commandline_current;
 151         }
 152 }
 153
 154
 155 /**
 156  *      do_NCR53C80_setup               -       set up entry point
 157  *      @str: unused
 158  *
 159  *      Setup function invoked at boot to parse the ncr5380= command
 160  *      line.
 161  */
 162
 163 static int __init do_NCR5380_setup(char *str)
 164 {
 165         int ints[10];
 166
 167         get_options(str, ARRAY_SIZE(ints), ints);
 168         internal_setup(BOARD_NCR5380, str, ints);
 169         return 1;
 170 }
 171
 172 /**
 173  *      do_NCR53C400_setup              -       set up entry point
 174  *      @str: unused
 175  *      @ints: integer parameters from kernel setup code
 176  *
 177  *      Setup function invoked at boot to parse the ncr53c400= command
 178  *      line.
 179  */
 180
 181 static int __init do_NCR53C400_setup(char *str)
 182 {
 183         int ints[10];
 184
 185         get_options(str, ARRAY_SIZE(ints), ints);
 186         internal_setup(BOARD_NCR53C400, str, ints);
 187         return 1;
 188 }
 189
 190 /**
 191  *      do_NCR53C400A_setup     -       set up entry point
 192  *      @str: unused
 193  *      @ints: integer parameters from kernel setup code
 194  *
 195  *      Setup function invoked at boot to parse the ncr53c400a= command
 196  *      line.
 197  */
 198
 199 static int __init do_NCR53C400A_setup(char *str)
 200 {
 201         int ints[10];
 202
 203         get_options(str, ARRAY_SIZE(ints), ints);
 204         internal_setup(BOARD_NCR53C400A, str, ints);
 205         return 1;
 206 }
 207
 208 /**
 209  *      do_DTC3181E_setup       -       set up entry point
 210  *      @str: unused
 211  *      @ints: integer parameters from kernel setup code
 212  *
 213  *      Setup function invoked at boot to parse the dtc3181e= command
 214  *      line.
 215  */
 216
 217 static int __init do_DTC3181E_setup(char *str)
 218 {
 219         int ints[10];
 220
 221         get_options(str, ARRAY_SIZE(ints), ints);
 222         internal_setup(BOARD_DTC3181E, str, ints);
 223         return 1;
 224 }
 225
 226 #endif
 227
 228 /**
 229  *      generic_NCR5380_detect  -       look for NCR5380 controllers
 230  *      @tpnt: the scsi template
 231  *
 232  *      Scan for the present of NCR5380, NCR53C400, NCR53C400A, DTC3181E
 233  *      and DTC436(ISAPnP) controllers. If overrides have been set we use
 234  *      them.
 235  *
 236  *      Locks: none
 237  */
 238
 239 static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
 240 {
 241         static int current_override;
 242         int count;
 243         unsigned int *ports;
 244 #ifndef SCSI_G_NCR5380_MEM
 245         int i;
 246         unsigned long region_size = 16;
 247 #endif
 248         static unsigned int __initdata ncr_53c400a_ports[] = {
 249                 0x280, 0x290, 0x300, 0x310, 0x330, 0x340, 0x348, 0x350, 0
 250         };
 251         static unsigned int __initdata dtc_3181e_ports[] = {
 252                 0x220, 0x240, 0x280, 0x2a0, 0x2c0, 0x300, 0x320, 0x340, 0
 253         };
 254         int flags;
 255         struct Scsi_Host *instance;
 256         struct NCR5380_hostdata *hostdata;
 257 #ifdef SCSI_G_NCR5380_MEM
 258         unsigned long base;
 259         void __iomem *iomem;
 260 #endif
 261
 262         if (ncr_irq)
 263                 overrides[0].irq = ncr_irq;
 264         if (ncr_dma)
 265                 overrides[0].dma = ncr_dma;
 266         if (ncr_addr)
 267                 overrides[0].NCR5380_map_name = (NCR5380_map_type) ncr_addr;
 268         if (ncr_5380)
 269                 overrides[0].board = BOARD_NCR5380;
 270         else if (ncr_53c400)
 271                 overrides[0].board = BOARD_NCR53C400;
 272         else if (ncr_53c400a)
 273                 overrides[0].board = BOARD_NCR53C400A;
 274         else if (dtc_3181e)
 275                 overrides[0].board = BOARD_DTC3181E;
 276 #ifndef SCSI_G_NCR5380_MEM
 277         if (!current_override && isapnp_present()) {
 278                 struct pnp_dev *dev = NULL;
 279                 count = 0;
 280                 while ((dev = pnp_find_dev(NULL, ISAPNP_VENDOR('D', 'T', 'C'), ISAPNP_FUNCTION(0x436e), dev))) {
 281                         if (count >= NO_OVERRIDES)
 282                                 break;
 283                         if (pnp_device_attach(dev) < 0)
 284                                 continue;
 285                         if (pnp_activate_dev(dev) < 0) {
 286                                 printk(KERN_ERR "dtc436e probe: activate failed\n");
 287                                 pnp_device_detach(dev);
 288                                 continue;
 289                         }
 290                         if (!pnp_port_valid(dev, 0)) {
 291                                 printk(KERN_ERR "dtc436e probe: no valid port\n");
 292                                 pnp_device_detach(dev);
 293                                 continue;
 294                         }
 295                         if (pnp_irq_valid(dev, 0))
 296                                 overrides[count].irq = pnp_irq(dev, 0);
 297                         else
 298                                 overrides[count].irq = NO_IRQ;
 299                         if (pnp_dma_valid(dev, 0))
 300                                 overrides[count].dma = pnp_dma(dev, 0);
 301                         else
 302                                 overrides[count].dma = DMA_NONE;
 303                         overrides[count].NCR5380_map_name = (NCR5380_map_type) pnp_port_start(dev, 0);
 304                         overrides[count].board = BOARD_DTC3181E;
 305                         count++;
 306                 }
 307         }
 308 #endif
 309
 310         for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
 311                 if (!(overrides[current_override].NCR5380_map_name))
 312                         continue;
 313
 314                 ports = NULL;
 315                 flags = 0;
 316                 switch (overrides[current_override].board) {
 317                 case BOARD_NCR5380:
 318                         flags = FLAG_NO_PSEUDO_DMA;
 319                         break;
 320                 case BOARD_NCR53C400:
 321 #ifdef PSEUDO_DMA
 322                         flags = FLAG_NO_DMA_FIXUP;
 323 #endif
 324                         break;
 325                 case BOARD_NCR53C400A:
 326                         flags = FLAG_NO_DMA_FIXUP;
 327                         ports = ncr_53c400a_ports;
 328                         break;
 329                 case BOARD_DTC3181E:
 330                         flags = FLAG_NO_DMA_FIXUP;
 331                         ports = dtc_3181e_ports;
 332                         break;
 333                 }
 334
 335 #ifndef SCSI_G_NCR5380_MEM
 336                 if (ports) {
 337                         /* wakeup sequence for the NCR53C400A and DTC3181E */
 338
 339                         /* Disable the adapter and look for a free io port */
 340                         outb(0x59, 0x779);
 341                         outb(0xb9, 0x379);
 342                         outb(0xc5, 0x379);
 343                         outb(0xae, 0x379);
 344                         outb(0xa6, 0x379);
 345                         outb(0x00, 0x379);
 346
 347                         if (overrides[current_override].NCR5380_map_name != PORT_AUTO)
 348                                 for (i = 0; ports[i]; i++) {
 349                                         if (!request_region(ports[i],  16, "ncr53c80"))
 350                                                 continue;
 351                                         if (overrides[current_override].NCR5380_map_name == ports[i])
 352                                                 break;
 353                                         release_region(ports[i], 16);
 354                         } else
 355                                 for (i = 0; ports[i]; i++) {
 356                                         if (!request_region(ports[i],  16, "ncr53c80"))
 357                                                 continue;
 358                                         if (inb(ports[i]) == 0xff)
 359                                                 break;
 360                                         release_region(ports[i], 16);
 361                                 }
 362                         if (ports[i]) {
 363                                 /* At this point we have our region reserved */
 364                                 outb(0x59, 0x779);
 365                                 outb(0xb9, 0x379);
 366                                 outb(0xc5, 0x379);
 367                                 outb(0xae, 0x379);
 368                                 outb(0xa6, 0x379);
 369                                 outb(0x80 | i, 0x379);  /* set io port to be used */
 370                                 outb(0xc0, ports[i] + 9);
 371                                 if (inb(ports[i] + 9) != 0x80)
 372                                         continue;
 373                                 else
 374                                         overrides[current_override].NCR5380_map_name = ports[i];
 375                         } else
 376                                 continue;
 377                 }
 378                 else
 379                 {
 380                         /* Not a 53C400A style setup - just grab */
 381                         if(!(request_region(overrides[current_override].NCR5380_map_name, NCR5380_region_size, "ncr5380")))
 382                                 continue;
 383                         region_size = NCR5380_region_size;
 384                 }
 385 #else
 386                 base = overrides[current_override].NCR5380_map_name;
 387                 if (!request_mem_region(base, NCR5380_region_size, "ncr5380"))
 388                         continue;
 389                 iomem = ioremap(base, NCR5380_region_size);
 390                 if (!iomem) {
 391                         release_mem_region(base, NCR5380_region_size);
 392                         continue;
 393                 }
 394 #endif
 395                 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
 396                 if (instance == NULL)
 397                         goto out_release;
 398                 hostdata = shost_priv(instance);
 399
 400 #ifndef SCSI_G_NCR5380_MEM
 401                 instance->io_port = overrides[current_override].NCR5380_map_name;
 402                 instance->n_io_port = region_size;
 403                 hostdata->io_width = 1; /* 8-bit PDMA by default */
 404
 405                 /*
 406                  * On NCR53C400 boards, NCR5380 registers are mapped 8 past
 407                  * the base address.
 408                  */
 409                 switch (overrides[current_override].board) {
 410                 case BOARD_NCR53C400:
 411                         instance->io_port += 8;
 412                         hostdata->c400_ctl_status = 0;
 413                         hostdata->c400_blk_cnt = 1;
 414                         hostdata->c400_host_buf = 4;
 415                         break;
 416                 case BOARD_DTC3181E:
 417                         hostdata->io_width = 2; /* 16-bit PDMA */
 418                         /* fall through */
 419                 case BOARD_NCR53C400A:
 420                         hostdata->c400_ctl_status = 9;
 421                         hostdata->c400_blk_cnt = 10;
 422                         hostdata->c400_host_buf = 8;
 423                         break;
 424                 }
 425 #else
 426                 instance->base = overrides[current_override].NCR5380_map_name;
 427                 hostdata->iomem = iomem;
 428                 switch (overrides[current_override].board) {
 429                 case BOARD_NCR53C400:
 430                         hostdata->c400_ctl_status = 0x100;
 431                         hostdata->c400_blk_cnt = 0x101;
 432                         hostdata->c400_host_buf = 0x104;
 433                         break;
 434                 case BOARD_DTC3181E:
 435                 case BOARD_NCR53C400A:
 436                         pr_err(DRV_MODULE_NAME ": unknown register offsets\n");
 437                         goto out_unregister;
 438                 }
 439 #endif
 440
 441                 if (NCR5380_init(instance, flags))
 442                         goto out_unregister;
 443
 444                 switch (overrides[current_override].board) {
 445                 case BOARD_NCR53C400:
 446                 case BOARD_DTC3181E:
 447                 case BOARD_NCR53C400A:
 448                         NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
 449                 }
 450
 451                 NCR5380_maybe_reset_bus(instance);
 452
 453                 if (overrides[current_override].irq != IRQ_AUTO)
 454                         instance->irq = overrides[current_override].irq;
 455                 else
 456                         instance->irq = NCR5380_probe_irq(instance, 0xffff);
 457
 458                 /* Compatibility with documented NCR5380 kernel parameters */
 459                 if (instance->irq == 255)
 460                         instance->irq = NO_IRQ;
 461
 462                 if (instance->irq != NO_IRQ)
 463                         if (request_irq(instance->irq, generic_NCR5380_intr,
 464                                         0, "NCR5380", instance)) {
 465                                 printk(KERN_WARNING "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
 466                                 instance->irq = NO_IRQ;
 467                         }
 468
 469                 if (instance->irq == NO_IRQ) {
 470                         printk(KERN_INFO "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
 471                         printk(KERN_INFO "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
 472                 }
 473
 474                 ++current_override;
 475                 ++count;
 476         }
 477         return count;
 478
 479 out_unregister:
 480         scsi_unregister(instance);
 481 out_release:
 482 #ifndef SCSI_G_NCR5380_MEM
 483         release_region(overrides[current_override].NCR5380_map_name, region_size);
 484 #else
 485         iounmap(iomem);
 486         release_mem_region(base, NCR5380_region_size);
 487 #endif
 488         return count;
 489 }
 490
 491 /**
 492  *      generic_NCR5380_release_resources       -       free resources
 493  *      @instance: host adapter to clean up
 494  *
 495  *      Free the generic interface resources from this adapter.
 496  *
 497  *      Locks: none
 498  */
 499
 500 static int generic_NCR5380_release_resources(struct Scsi_Host *instance)
 501 {
 502         if (instance->irq != NO_IRQ)
 503                 free_irq(instance->irq, instance);
 504         NCR5380_exit(instance);
 505 #ifndef SCSI_G_NCR5380_MEM
 506         release_region(instance->io_port, instance->n_io_port);
 507 #else
 508         iounmap(((struct NCR5380_hostdata *)instance->hostdata)->iomem);
 509         release_mem_region(instance->base, NCR5380_region_size);
 510 #endif
 511         return 0;
 512 }
 513
 514 #ifdef BIOSPARAM
 515 /**
 516  *      generic_NCR5380_biosparam
 517  *      @disk: disk to compute geometry for
 518  *      @dev: device identifier for this disk
 519  *      @ip: sizes to fill in
 520  *
 521  *      Generates a BIOS / DOS compatible H-C-S mapping for the specified
 522  *      device / size.
 523  *
 524  *      XXX Most SCSI boards use this mapping, I could be incorrect.  Someone
 525  *      using hard disks on a trantor should verify that this mapping
 526  *      corresponds to that used by the BIOS / ASPI driver by running the linux
 527  *      fdisk program and matching the H_C_S coordinates to what DOS uses.
 528  *
 529  *      Locks: none
 530  */
 531
 532 static int
 533 generic_NCR5380_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 534                           sector_t capacity, int *ip)
 535 {
 536         ip[0] = 64;
 537         ip[1] = 32;
 538         ip[2] = capacity >> 11;
 539         return 0;
 540 }
 541 #endif
 542
 543 #ifdef PSEUDO_DMA
 544
 545 /**
 546  *      NCR5380_pread           -       pseudo DMA read
 547  *      @instance: adapter to read from
 548  *      @dst: buffer to read into
 549  *      @len: buffer length
 550  *
 551  *      Perform a pseudo DMA mode read from an NCR53C400 or equivalent
 552  *      controller
 553  */
 554
 555 static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
 556 {
 557         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 558         int blocks = len / 128;
 559         int start = 0;
 560
 561         NCR5380_write(hostdata->c400_ctl_status, CSR_BASE | CSR_TRANS_DIR);
 562         NCR5380_write(hostdata->c400_blk_cnt, blocks);
 563         while (1) {
 564                 if (NCR5380_read(hostdata->c400_blk_cnt) == 0)
 565                         break;
 566                 if (NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ) {
 567                         printk(KERN_ERR "53C400r: Got 53C80_IRQ start=%d, blocks=%d\n", start, blocks);
 568                         return -1;
 569                 }
 570                 while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
 571                         ; /* FIXME - no timeout */
 572
 573 #ifndef SCSI_G_NCR5380_MEM
 574                 if (hostdata->io_width == 2)
 575                         insw(instance->io_port + hostdata->c400_host_buf,
 576                                                         dst + start, 64);
 577                 else
 578                         insb(instance->io_port + hostdata->c400_host_buf,
 579                                                         dst + start, 128);
 580 #else
 581                 /* implies SCSI_G_NCR5380_MEM */
 582                 memcpy_fromio(dst + start,
 583                               hostdata->iomem + NCR53C400_host_buffer, 128);
 584 #endif
 585                 start += 128;
 586                 blocks--;
 587         }
 588
 589         if (blocks) {
 590                 while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
 591                         ; /* FIXME - no timeout */
 592
 593 #ifndef SCSI_G_NCR5380_MEM
 594                 if (hostdata->io_width == 2)
 595                         insw(instance->io_port + hostdata->c400_host_buf,
 596                                                         dst + start, 64);
 597                 else
 598                         insb(instance->io_port + hostdata->c400_host_buf,
 599                                                         dst + start, 128);
 600 #else
 601                 /* implies SCSI_G_NCR5380_MEM */
 602                 memcpy_fromio(dst + start,
 603                               hostdata->iomem + NCR53C400_host_buffer, 128);
 604 #endif
 605                 start += 128;
 606                 blocks--;
 607         }
 608
 609         if (!(NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ))
 610                 printk("53C400r: no 53C80 gated irq after transfer");
 611
 612         /* wait for 53C80 registers to be available */
 613         while (!(NCR5380_read(hostdata->c400_ctl_status) & CSR_53C80_REG))
 614                 ;
 615
 616         if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_END_DMA_TRANSFER))
 617                 printk(KERN_ERR "53C400r: no end dma signal\n");
 618
 619         return 0;
 620 }
 621
 622 /**
 623  *      NCR5380_write           -       pseudo DMA write
 624  *      @instance: adapter to read from
 625  *      @dst: buffer to read into
 626  *      @len: buffer length
 627  *
 628  *      Perform a pseudo DMA mode read from an NCR53C400 or equivalent
 629  *      controller
 630  */
 631
 632 static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
 633 {
 634         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 635         int blocks = len / 128;
 636         int start = 0;
 637
 638         NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
 639         NCR5380_write(hostdata->c400_blk_cnt, blocks);
 640         while (1) {
 641                 if (NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ) {
 642                         printk(KERN_ERR "53C400w: Got 53C80_IRQ start=%d, blocks=%d\n", start, blocks);
 643                         return -1;
 644                 }
 645
 646                 if (NCR5380_read(hostdata->c400_blk_cnt) == 0)
 647                         break;
 648                 while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
 649                         ; // FIXME - timeout
 650 #ifndef SCSI_G_NCR5380_MEM
 651                 if (hostdata->io_width == 2)
 652                         outsw(instance->io_port + hostdata->c400_host_buf,
 653                                                         src + start, 64);
 654                 else
 655                         outsb(instance->io_port + hostdata->c400_host_buf,
 656                                                         src + start, 128);
 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         if (blocks) {
 666                 while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
 667                         ; // FIXME - no timeout
 668
 669 #ifndef SCSI_G_NCR5380_MEM
 670                 if (hostdata->io_width == 2)
 671                         outsw(instance->io_port + hostdata->c400_host_buf,
 672                                                         src + start, 64);
 673                 else
 674                         outsb(instance->io_port + hostdata->c400_host_buf,
 675                                                         src + start, 128);
 676 #else
 677                 /* implies SCSI_G_NCR5380_MEM */
 678                 memcpy_toio(hostdata->iomem + NCR53C400_host_buffer,
 679                             src + start, 128);
 680 #endif
 681                 start += 128;
 682                 blocks--;
 683         }
 684
 685         /* wait for 53C80 registers to be available */
 686         while (!(NCR5380_read(hostdata->c400_ctl_status) & CSR_53C80_REG)) {
 687                 udelay(4); /* DTC436 chip hangs without this */
 688                 /* FIXME - no timeout */
 689         }
 690
 691         if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_END_DMA_TRANSFER)) {
 692                 printk(KERN_ERR "53C400w: no end dma signal\n");
 693         }
 694
 695         while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
 696                 ;       // TIMEOUT
 697         return 0;
 698 }
 699
 700 static int generic_NCR5380_dma_xfer_len(struct scsi_cmnd *cmd)
 701 {
 702         int transfersize = cmd->transfersize;
 703
 704         /* Limit transfers to 32K, for xx400 & xx406
 705          * pseudoDMA that transfers in 128 bytes blocks.
 706          */
 707         if (transfersize > 32 * 1024 && cmd->SCp.this_residual &&
 708             !(cmd->SCp.this_residual % transfersize))
 709                 transfersize = 32 * 1024;
 710
 711         /* 53C400 datasheet: non-modulo-128-byte transfers should use PIO */
 712         if (transfersize % 128)
 713                 transfersize = 0;
 714
 715         return transfersize;
 716 }
 717
 718 #endif /* PSEUDO_DMA */
 719
 720 /*
 721  *      Include the NCR5380 core code that we build our driver around
 722  */
 723
 724 #include "NCR5380.c"
 725
 726 static struct scsi_host_template driver_template = {
 727         .proc_name              = DRV_MODULE_NAME,
 728         .name                   = "Generic NCR5380/NCR53C400 SCSI",
 729         .detect                 = generic_NCR5380_detect,
 730         .release                = generic_NCR5380_release_resources,
 731         .info                   = generic_NCR5380_info,
 732         .queuecommand           = generic_NCR5380_queue_command,
 733         .eh_abort_handler       = generic_NCR5380_abort,
 734         .eh_bus_reset_handler   = generic_NCR5380_bus_reset,
 735         .bios_param             = NCR5380_BIOSPARAM,
 736         .can_queue              = 16,
 737         .this_id                = 7,
 738         .sg_tablesize           = SG_ALL,
 739         .cmd_per_lun            = 2,
 740         .use_clustering         = DISABLE_CLUSTERING,
 741         .cmd_size               = NCR5380_CMD_SIZE,
 742         .max_sectors            = 128,
 743 };
 744
 745 #include "scsi_module.c"
 746
 747 module_param(ncr_irq, int, 0);
 748 module_param(ncr_dma, int, 0);
 749 module_param(ncr_addr, int, 0);
 750 module_param(ncr_5380, int, 0);
 751 module_param(ncr_53c400, int, 0);
 752 module_param(ncr_53c400a, int, 0);
 753 module_param(dtc_3181e, int, 0);
 754 MODULE_LICENSE("GPL");
 755
 756 #if !defined(SCSI_G_NCR5380_MEM) && defined(MODULE)
 757 static struct isapnp_device_id id_table[] = {
 758         {
 759          ISAPNP_ANY_ID, ISAPNP_ANY_ID,
 760          ISAPNP_VENDOR('D', 'T', 'C'), ISAPNP_FUNCTION(0x436e),
 761          0},
 762         {0}
 763 };
 764
 765 MODULE_DEVICE_TABLE(isapnp, id_table);
 766 #endif
 767
 768 __setup("ncr5380=", do_NCR5380_setup);
 769 __setup("ncr53c400=", do_NCR53C400_setup);
 770 __setup("ncr53c400a=", do_NCR53C400A_setup);
 771 __setup("dtc3181e=", do_DTC3181E_setup);