drivers/scsi/g_NCR5380.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Generic Generic NCR5380 driver
   4  *
   5  * Copyright 1993, Drew Eckhardt
   6  * Visionary Computing
   7  * (Unix and Linux consulting and custom programming)
   8  * drew@colorado.edu
   9  * +1 (303) 440-4894
  10  *
  11  * NCR53C400 extensions (c) 1994,1995,1996, Kevin Lentin
  12  * K.Lentin@cs.monash.edu.au
  13  *
  14  * NCR53C400A extensions (c) 1996, Ingmar Baumgart
  15  * ingmar@gonzo.schwaben.de
  16  *
  17  * DTC3181E extensions (c) 1997, Ronald van Cuijlenborg
  18  * ronald.van.cuijlenborg@tip.nl or nutty@dds.nl
  19  *
  20  * Added ISAPNP support for DTC436 adapters,
  21  * Thomas Sailer, sailer@ife.ee.ethz.ch
  22  *
  23  * See Documentation/scsi/g_NCR5380.rst for more info.
  24  */
  25
  26 #include <asm/io.h>
  27 #include <linux/blkdev.h>
  28 #include <linux/module.h>
  29 #include <scsi/scsi_host.h>
  30 #include <linux/init.h>
  31 #include <linux/ioport.h>
  32 #include <linux/isa.h>
  33 #include <linux/pnp.h>
  34 #include <linux/interrupt.h>
  35
  36 /* Definitions for the core NCR5380 driver. */
  37
  38 #define NCR5380_read(reg) \
  39         ioread8(hostdata->io + hostdata->offset + (reg))
  40 #define NCR5380_write(reg, value) \
  41         iowrite8(value, hostdata->io + hostdata->offset + (reg))
  42
  43 #define NCR5380_implementation_fields \
  44         int offset; \
  45         int c400_ctl_status; \
  46         int c400_blk_cnt; \
  47         int c400_host_buf; \
  48         int io_width; \
  49         int pdma_residual; \
  50         int board
  51
  52 #define NCR5380_dma_xfer_len            generic_NCR5380_dma_xfer_len
  53 #define NCR5380_dma_recv_setup          generic_NCR5380_precv
  54 #define NCR5380_dma_send_setup          generic_NCR5380_psend
  55 #define NCR5380_dma_residual            generic_NCR5380_dma_residual
  56
  57 #define NCR5380_intr                    generic_NCR5380_intr
  58 #define NCR5380_queue_command           generic_NCR5380_queue_command
  59 #define NCR5380_abort                   generic_NCR5380_abort
  60 #define NCR5380_host_reset              generic_NCR5380_host_reset
  61 #define NCR5380_info                    generic_NCR5380_info
  62
  63 #define NCR5380_io_delay(x)             udelay(x)
  64
  65 #include "NCR5380.h"
  66
  67 #define DRV_MODULE_NAME "g_NCR5380"
  68
  69 #define NCR53C400_mem_base 0x3880
  70 #define NCR53C400_host_buffer 0x3900
  71 #define NCR53C400_region_size 0x3a00
  72
  73 #define BOARD_NCR5380 0
  74 #define BOARD_NCR53C400 1
  75 #define BOARD_NCR53C400A 2
  76 #define BOARD_DTC3181E 3
  77 #define BOARD_HP_C2502 4
  78
  79 #define IRQ_AUTO 254
  80
  81 #define MAX_CARDS 8
  82 #define DMA_MAX_SIZE 32768
  83
  84 /* old-style parameters for compatibility */
  85 static int ncr_irq = -1;
  86 static int ncr_addr;
  87 static int ncr_5380;
  88 static int ncr_53c400;
  89 static int ncr_53c400a;
  90 static int dtc_3181e;
  91 static int hp_c2502;
  92 module_param_hw(ncr_irq, int, irq, 0);
  93 module_param_hw(ncr_addr, int, ioport, 0);
  94 module_param(ncr_5380, int, 0);
  95 module_param(ncr_53c400, int, 0);
  96 module_param(ncr_53c400a, int, 0);
  97 module_param(dtc_3181e, int, 0);
  98 module_param(hp_c2502, int, 0);
  99
 100 static int irq[] = { -1, -1, -1, -1, -1, -1, -1, -1 };
 101 module_param_hw_array(irq, int, irq, NULL, 0);
 102 MODULE_PARM_DESC(irq, "IRQ number(s) (0=none, 254=auto [default])");
 103
 104 static int base[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
 105 module_param_hw_array(base, int, ioport, NULL, 0);
 106 MODULE_PARM_DESC(base, "base address(es)");
 107
 108 static int card[] = { -1, -1, -1, -1, -1, -1, -1, -1 };
 109 module_param_array(card, int, NULL, 0);
 110 MODULE_PARM_DESC(card, "card type (0=NCR5380, 1=NCR53C400, 2=NCR53C400A, 3=DTC3181E, 4=HP C2502)");
 111
 112 MODULE_ALIAS("g_NCR5380_mmio");
 113 MODULE_LICENSE("GPL");
 114
 115 static void g_NCR5380_trigger_irq(struct Scsi_Host *instance)
 116 {
 117         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 118
 119         /*
 120          * An interrupt is triggered whenever BSY = false, SEL = true
 121          * and a bit set in the SELECT_ENABLE_REG is asserted on the
 122          * SCSI bus.
 123          *
 124          * Note that the bus is only driven when the phase control signals
 125          * (I/O, C/D, and MSG) match those in the TCR.
 126          */
 127         NCR5380_write(TARGET_COMMAND_REG,
 128                       PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
 129         NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
 130         NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
 131         NCR5380_write(INITIATOR_COMMAND_REG,
 132                       ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);
 133
 134         msleep(1);
 135
 136         NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
 137         NCR5380_write(SELECT_ENABLE_REG, 0);
 138         NCR5380_write(TARGET_COMMAND_REG, 0);
 139 }
 140
 141 /**
 142  * g_NCR5380_probe_irq - find the IRQ of a NCR5380 or equivalent
 143  * @instance: SCSI host instance
 144  *
 145  * Autoprobe for the IRQ line used by the card by triggering an IRQ
 146  * and then looking to see what interrupt actually turned up.
 147  */
 148
 149 static int g_NCR5380_probe_irq(struct Scsi_Host *instance)
 150 {
 151         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 152         int irq_mask, irq;
 153
 154         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 155         irq_mask = probe_irq_on();
 156         g_NCR5380_trigger_irq(instance);
 157         irq = probe_irq_off(irq_mask);
 158         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 159
 160         if (irq <= 0)
 161                 return NO_IRQ;
 162         return irq;
 163 }
 164
 165 /*
 166  * Configure I/O address of 53C400A or DTC436 by writing magic numbers
 167  * to ports 0x779 and 0x379.
 168  */
 169 static void magic_configure(int idx, u8 irq, u8 magic[])
 170 {
 171         u8 cfg = 0;
 172
 173         outb(magic[0], 0x779);
 174         outb(magic[1], 0x379);
 175         outb(magic[2], 0x379);
 176         outb(magic[3], 0x379);
 177         outb(magic[4], 0x379);
 178
 179         if (irq == 9)
 180                 irq = 2;
 181
 182         if (idx >= 0 && idx <= 7)
 183                 cfg = 0x80 | idx | (irq << 4);
 184         outb(cfg, 0x379);
 185 }
 186
 187 static irqreturn_t legacy_empty_irq_handler(int irq, void *dev_id)
 188 {
 189         return IRQ_HANDLED;
 190 }
 191
 192 static int legacy_find_free_irq(int *irq_table)
 193 {
 194         while (*irq_table != -1) {
 195                 if (!request_irq(*irq_table, legacy_empty_irq_handler,
 196                                  IRQF_PROBE_SHARED, "Test IRQ",
 197                                  (void *)irq_table)) {
 198                         free_irq(*irq_table, (void *) irq_table);
 199                         return *irq_table;
 200                 }
 201                 irq_table++;
 202         }
 203         return -1;
 204 }
 205
 206 static unsigned int ncr_53c400a_ports[] = {
 207         0x280, 0x290, 0x300, 0x310, 0x330, 0x340, 0x348, 0x350, 0
 208 };
 209 static unsigned int dtc_3181e_ports[] = {
 210         0x220, 0x240, 0x280, 0x2a0, 0x2c0, 0x300, 0x320, 0x340, 0
 211 };
 212 static u8 ncr_53c400a_magic[] = {       /* 53C400A & DTC436 */
 213         0x59, 0xb9, 0xc5, 0xae, 0xa6
 214 };
 215 static u8 hp_c2502_magic[] = {  /* HP C2502 */
 216         0x0f, 0x22, 0xf0, 0x20, 0x80
 217 };
 218 static int hp_c2502_irqs[] = {
 219         9, 5, 7, 3, 4, -1
 220 };
 221
 222 static int generic_NCR5380_init_one(struct scsi_host_template *tpnt,
 223                         struct device *pdev, int base, int irq, int board)
 224 {
 225         bool is_pmio = base <= 0xffff;
 226         int ret;
 227         int flags = 0;
 228         unsigned int *ports = NULL;
 229         u8 *magic = NULL;
 230         int i;
 231         int port_idx = -1;
 232         unsigned long region_size;
 233         struct Scsi_Host *instance;
 234         struct NCR5380_hostdata *hostdata;
 235         u8 __iomem *iomem;
 236
 237         switch (board) {
 238         case BOARD_NCR5380:
 239                 flags = FLAG_NO_PSEUDO_DMA | FLAG_DMA_FIXUP;
 240                 break;
 241         case BOARD_NCR53C400A:
 242                 ports = ncr_53c400a_ports;
 243                 magic = ncr_53c400a_magic;
 244                 break;
 245         case BOARD_HP_C2502:
 246                 ports = ncr_53c400a_ports;
 247                 magic = hp_c2502_magic;
 248                 break;
 249         case BOARD_DTC3181E:
 250                 ports = dtc_3181e_ports;
 251                 magic = ncr_53c400a_magic;
 252                 break;
 253         }
 254
 255         if (is_pmio && ports && magic) {
 256                 /* wakeup sequence for the NCR53C400A and DTC3181E */
 257
 258                 /* Disable the adapter and look for a free io port */
 259                 magic_configure(-1, 0, magic);
 260
 261                 region_size = 16;
 262                 if (base)
 263                         for (i = 0; ports[i]; i++) {
 264                                 if (base == ports[i]) { /* index found */
 265                                         if (!request_region(ports[i],
 266                                                             region_size,
 267                                                             "ncr53c80"))
 268                                                 return -EBUSY;
 269                                         break;
 270                                 }
 271                         }
 272                 else
 273                         for (i = 0; ports[i]; i++) {
 274                                 if (!request_region(ports[i], region_size,
 275                                                     "ncr53c80"))
 276                                         continue;
 277                                 if (inb(ports[i]) == 0xff)
 278                                         break;
 279                                 release_region(ports[i], region_size);
 280                         }
 281                 if (ports[i]) {
 282                         /* At this point we have our region reserved */
 283                         magic_configure(i, 0, magic); /* no IRQ yet */
 284                         base = ports[i];
 285                         outb(0xc0, base + 9);
 286                         if (inb(base + 9) != 0x80) {
 287                                 ret = -ENODEV;
 288                                 goto out_release;
 289                         }
 290                         port_idx = i;
 291                 } else
 292                         return -EINVAL;
 293         } else if (is_pmio) {
 294                 /* NCR5380 - no configuration, just grab */
 295                 region_size = 8;
 296                 if (!base || !request_region(base, region_size, "ncr5380"))
 297                         return -EBUSY;
 298         } else {        /* MMIO */
 299                 region_size = NCR53C400_region_size;
 300                 if (!request_mem_region(base, region_size, "ncr5380"))
 301                         return -EBUSY;
 302         }
 303
 304         if (is_pmio)
 305                 iomem = ioport_map(base, region_size);
 306         else
 307                 iomem = ioremap(base, region_size);
 308
 309         if (!iomem) {
 310                 ret = -ENOMEM;
 311                 goto out_release;
 312         }
 313
 314         instance = scsi_host_alloc(tpnt, sizeof(struct NCR5380_hostdata));
 315         if (instance == NULL) {
 316                 ret = -ENOMEM;
 317                 goto out_unmap;
 318         }
 319         hostdata = shost_priv(instance);
 320
 321         hostdata->board = board;
 322         hostdata->io = iomem;
 323         hostdata->region_size = region_size;
 324
 325         if (is_pmio) {
 326                 hostdata->io_port = base;
 327                 hostdata->io_width = 1; /* 8-bit PDMA by default */
 328                 hostdata->offset = 0;
 329
 330                 /*
 331                  * On NCR53C400 boards, NCR5380 registers are mapped 8 past
 332                  * the base address.
 333                  */
 334                 switch (board) {
 335                 case BOARD_NCR53C400:
 336                         hostdata->io_port += 8;
 337                         hostdata->c400_ctl_status = 0;
 338                         hostdata->c400_blk_cnt = 1;
 339                         hostdata->c400_host_buf = 4;
 340                         break;
 341                 case BOARD_DTC3181E:
 342                         hostdata->io_width = 2; /* 16-bit PDMA */
 343                         fallthrough;
 344                 case BOARD_NCR53C400A:
 345                 case BOARD_HP_C2502:
 346                         hostdata->c400_ctl_status = 9;
 347                         hostdata->c400_blk_cnt = 10;
 348                         hostdata->c400_host_buf = 8;
 349                         break;
 350                 }
 351         } else {
 352                 hostdata->base = base;
 353                 hostdata->offset = NCR53C400_mem_base;
 354                 switch (board) {
 355                 case BOARD_NCR53C400:
 356                         hostdata->c400_ctl_status = 0x100;
 357                         hostdata->c400_blk_cnt = 0x101;
 358                         hostdata->c400_host_buf = 0x104;
 359                         break;
 360                 case BOARD_DTC3181E:
 361                 case BOARD_NCR53C400A:
 362                 case BOARD_HP_C2502:
 363                         pr_err(DRV_MODULE_NAME ": unknown register offsets\n");
 364                         ret = -EINVAL;
 365                         goto out_unregister;
 366                 }
 367         }
 368
 369         /* Check for vacant slot */
 370         NCR5380_write(MODE_REG, 0);
 371         if (NCR5380_read(MODE_REG) != 0) {
 372                 ret = -ENODEV;
 373                 goto out_unregister;
 374         }
 375
 376         ret = NCR5380_init(instance, flags | FLAG_LATE_DMA_SETUP);
 377         if (ret)
 378                 goto out_unregister;
 379
 380         switch (board) {
 381         case BOARD_NCR53C400:
 382         case BOARD_DTC3181E:
 383         case BOARD_NCR53C400A:
 384         case BOARD_HP_C2502:
 385                 NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
 386         }
 387
 388         NCR5380_maybe_reset_bus(instance);
 389
 390         /* Compatibility with documented NCR5380 kernel parameters */
 391         if (irq == 255 || irq == 0)
 392                 irq = NO_IRQ;
 393         else if (irq == -1)
 394                 irq = IRQ_AUTO;
 395
 396         if (board == BOARD_HP_C2502) {
 397                 int *irq_table = hp_c2502_irqs;
 398                 int board_irq = -1;
 399
 400                 switch (irq) {
 401                 case NO_IRQ:
 402                         board_irq = 0;
 403                         break;
 404                 case IRQ_AUTO:
 405                         board_irq = legacy_find_free_irq(irq_table);
 406                         break;
 407                 default:
 408                         while (*irq_table != -1)
 409                                 if (*irq_table++ == irq)
 410                                         board_irq = irq;
 411                 }
 412
 413                 if (board_irq <= 0) {
 414                         board_irq = 0;
 415                         irq = NO_IRQ;
 416                 }
 417
 418                 magic_configure(port_idx, board_irq, magic);
 419         }
 420
 421         if (irq == IRQ_AUTO) {
 422                 instance->irq = g_NCR5380_probe_irq(instance);
 423                 if (instance->irq == NO_IRQ)
 424                         shost_printk(KERN_INFO, instance, "no irq detected\n");
 425         } else {
 426                 instance->irq = irq;
 427                 if (instance->irq == NO_IRQ)
 428                         shost_printk(KERN_INFO, instance, "no irq provided\n");
 429         }
 430
 431         if (instance->irq != NO_IRQ) {
 432                 if (request_irq(instance->irq, generic_NCR5380_intr,
 433                                 0, "NCR5380", instance)) {
 434                         instance->irq = NO_IRQ;
 435                         shost_printk(KERN_INFO, instance,
 436                                      "irq %d denied\n", instance->irq);
 437                 } else {
 438                         shost_printk(KERN_INFO, instance,
 439                                      "irq %d acquired\n", instance->irq);
 440                 }
 441         }
 442
 443         ret = scsi_add_host(instance, pdev);
 444         if (ret)
 445                 goto out_free_irq;
 446         scsi_scan_host(instance);
 447         dev_set_drvdata(pdev, instance);
 448         return 0;
 449
 450 out_free_irq:
 451         if (instance->irq != NO_IRQ)
 452                 free_irq(instance->irq, instance);
 453         NCR5380_exit(instance);
 454 out_unregister:
 455         scsi_host_put(instance);
 456 out_unmap:
 457         iounmap(iomem);
 458 out_release:
 459         if (is_pmio)
 460                 release_region(base, region_size);
 461         else
 462                 release_mem_region(base, region_size);
 463         return ret;
 464 }
 465
 466 static void generic_NCR5380_release_resources(struct Scsi_Host *instance)
 467 {
 468         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 469         void __iomem *iomem = hostdata->io;
 470         unsigned long io_port = hostdata->io_port;
 471         unsigned long base = hostdata->base;
 472         unsigned long region_size = hostdata->region_size;
 473
 474         scsi_remove_host(instance);
 475         if (instance->irq != NO_IRQ)
 476                 free_irq(instance->irq, instance);
 477         NCR5380_exit(instance);
 478         scsi_host_put(instance);
 479         iounmap(iomem);
 480         if (io_port)
 481                 release_region(io_port, region_size);
 482         else
 483                 release_mem_region(base, region_size);
 484 }
 485
 486 /* wait_for_53c80_access - wait for 53C80 registers to become accessible
 487  * @hostdata: scsi host private data
 488  *
 489  * The registers within the 53C80 logic block are inaccessible until
 490  * bit 7 in the 53C400 control status register gets asserted.
 491  */
 492
 493 static void wait_for_53c80_access(struct NCR5380_hostdata *hostdata)
 494 {
 495         int count = 10000;
 496
 497         do {
 498                 if (hostdata->board == BOARD_DTC3181E)
 499                         udelay(4); /* DTC436 chip hangs without this */
 500                 if (NCR5380_read(hostdata->c400_ctl_status) & CSR_53C80_REG)
 501                         return;
 502         } while (--count > 0);
 503
 504         scmd_printk(KERN_ERR, hostdata->connected,
 505                     "53c80 registers not accessible, device will be reset\n");
 506         NCR5380_write(hostdata->c400_ctl_status, CSR_RESET);
 507         NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
 508 }
 509
 510 /**
 511  * generic_NCR5380_precv - pseudo DMA receive
 512  * @hostdata: scsi host private data
 513  * @dst: buffer to write into
 514  * @len: transfer size
 515  *
 516  * Perform a pseudo DMA mode receive from a 53C400 or equivalent device.
 517  */
 518
 519 static inline int generic_NCR5380_precv(struct NCR5380_hostdata *hostdata,
 520                                         unsigned char *dst, int len)
 521 {
 522         int residual;
 523         int start = 0;
 524
 525         NCR5380_write(hostdata->c400_ctl_status, CSR_BASE | CSR_TRANS_DIR);
 526         NCR5380_write(hostdata->c400_blk_cnt, len / 128);
 527
 528         do {
 529                 if (start == len - 128) {
 530                         /* Ignore End of DMA interrupt for the final buffer */
 531                         if (NCR5380_poll_politely(hostdata, hostdata->c400_ctl_status,
 532                                                   CSR_HOST_BUF_NOT_RDY, 0, 0) < 0)
 533                                 break;
 534                 } else {
 535                         if (NCR5380_poll_politely2(hostdata, hostdata->c400_ctl_status,
 536                                                    CSR_HOST_BUF_NOT_RDY, 0,
 537                                                    hostdata->c400_ctl_status,
 538                                                    CSR_GATED_53C80_IRQ,
 539                                                    CSR_GATED_53C80_IRQ, 0) < 0 ||
 540                             NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
 541                                 break;
 542                 }
 543
 544                 if (hostdata->io_port && hostdata->io_width == 2)
 545                         insw(hostdata->io_port + hostdata->c400_host_buf,
 546                              dst + start, 64);
 547                 else if (hostdata->io_port)
 548                         insb(hostdata->io_port + hostdata->c400_host_buf,
 549                              dst + start, 128);
 550                 else
 551                         memcpy_fromio(dst + start,
 552                                 hostdata->io + NCR53C400_host_buffer, 128);
 553                 start += 128;
 554         } while (start < len);
 555
 556         residual = len - start;
 557
 558         if (residual != 0) {
 559                 /* 53c80 interrupt or transfer timeout. Reset 53c400 logic. */
 560                 NCR5380_write(hostdata->c400_ctl_status, CSR_RESET);
 561                 NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
 562         }
 563         wait_for_53c80_access(hostdata);
 564
 565         if (residual == 0 && NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
 566                                                    BASR_END_DMA_TRANSFER,
 567                                                    BASR_END_DMA_TRANSFER,
 568                                                    0) < 0)
 569                 scmd_printk(KERN_ERR, hostdata->connected, "%s: End of DMA timeout\n",
 570                             __func__);
 571
 572         hostdata->pdma_residual = residual;
 573
 574         return 0;
 575 }
 576
 577 /**
 578  * generic_NCR5380_psend - pseudo DMA send
 579  * @hostdata: scsi host private data
 580  * @src: buffer to read from
 581  * @len: transfer size
 582  *
 583  * Perform a pseudo DMA mode send to a 53C400 or equivalent device.
 584  */
 585
 586 static inline int generic_NCR5380_psend(struct NCR5380_hostdata *hostdata,
 587                                         unsigned char *src, int len)
 588 {
 589         int residual;
 590         int start = 0;
 591
 592         NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
 593         NCR5380_write(hostdata->c400_blk_cnt, len / 128);
 594
 595         do {
 596                 if (NCR5380_poll_politely2(hostdata, hostdata->c400_ctl_status,
 597                                            CSR_HOST_BUF_NOT_RDY, 0,
 598                                            hostdata->c400_ctl_status,
 599                                            CSR_GATED_53C80_IRQ,
 600                                            CSR_GATED_53C80_IRQ, 0) < 0 ||
 601                     NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY) {
 602                         /* Both 128 B buffers are in use */
 603                         if (start >= 128)
 604                                 start -= 128;
 605                         if (start >= 128)
 606                                 start -= 128;
 607                         break;
 608                 }
 609
 610                 if (start >= len && NCR5380_read(hostdata->c400_blk_cnt) == 0)
 611                         break;
 612
 613                 if (NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ) {
 614                         /* Host buffer is empty, other one is in use */
 615                         if (start >= 128)
 616                                 start -= 128;
 617                         break;
 618                 }
 619
 620                 if (start >= len)
 621                         continue;
 622
 623                 if (hostdata->io_port && hostdata->io_width == 2)
 624                         outsw(hostdata->io_port + hostdata->c400_host_buf,
 625                               src + start, 64);
 626                 else if (hostdata->io_port)
 627                         outsb(hostdata->io_port + hostdata->c400_host_buf,
 628                               src + start, 128);
 629                 else
 630                         memcpy_toio(hostdata->io + NCR53C400_host_buffer,
 631                                     src + start, 128);
 632                 start += 128;
 633         } while (1);
 634
 635         residual = len - start;
 636
 637         if (residual != 0) {
 638                 /* 53c80 interrupt or transfer timeout. Reset 53c400 logic. */
 639                 NCR5380_write(hostdata->c400_ctl_status, CSR_RESET);
 640                 NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
 641         }
 642         wait_for_53c80_access(hostdata);
 643
 644         if (residual == 0) {
 645                 if (NCR5380_poll_politely(hostdata, TARGET_COMMAND_REG,
 646                                           TCR_LAST_BYTE_SENT, TCR_LAST_BYTE_SENT,
 647                                           0) < 0)
 648                         scmd_printk(KERN_ERR, hostdata->connected,
 649                                     "%s: Last Byte Sent timeout\n", __func__);
 650
 651                 if (NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
 652                                           BASR_END_DMA_TRANSFER, BASR_END_DMA_TRANSFER,
 653                                           0) < 0)
 654                         scmd_printk(KERN_ERR, hostdata->connected, "%s: End of DMA timeout\n",
 655                                     __func__);
 656         }
 657
 658         hostdata->pdma_residual = residual;
 659
 660         return 0;
 661 }
 662
 663 static int generic_NCR5380_dma_xfer_len(struct NCR5380_hostdata *hostdata,
 664                                         struct scsi_cmnd *cmd)
 665 {
 666         int transfersize = cmd->SCp.this_residual;
 667
 668         if (hostdata->flags & FLAG_NO_PSEUDO_DMA)
 669                 return 0;
 670
 671         /* 53C400 datasheet: non-modulo-128-byte transfers should use PIO */
 672         if (transfersize % 128)
 673                 return 0;
 674
 675         /* Limit PDMA send to 512 B to avoid random corruption on DTC3181E */
 676         if (hostdata->board == BOARD_DTC3181E &&
 677             cmd->sc_data_direction == DMA_TO_DEVICE)
 678                 transfersize = min(cmd->SCp.this_residual, 512);
 679
 680         return min(transfersize, DMA_MAX_SIZE);
 681 }
 682
 683 static int generic_NCR5380_dma_residual(struct NCR5380_hostdata *hostdata)
 684 {
 685         return hostdata->pdma_residual;
 686 }
 687
 688 /* Include the core driver code. */
 689
 690 #include "NCR5380.c"
 691
 692 static struct scsi_host_template driver_template = {
 693         .module                 = THIS_MODULE,
 694         .proc_name              = DRV_MODULE_NAME,
 695         .name                   = "Generic NCR5380/NCR53C400 SCSI",
 696         .info                   = generic_NCR5380_info,
 697         .queuecommand           = generic_NCR5380_queue_command,
 698         .eh_abort_handler       = generic_NCR5380_abort,
 699         .eh_host_reset_handler  = generic_NCR5380_host_reset,
 700         .can_queue              = 16,
 701         .this_id                = 7,
 702         .sg_tablesize           = SG_ALL,
 703         .cmd_per_lun            = 2,
 704         .dma_boundary           = PAGE_SIZE - 1,
 705         .cmd_size               = NCR5380_CMD_SIZE,
 706         .max_sectors            = 128,
 707 };
 708
 709 static int generic_NCR5380_isa_match(struct device *pdev, unsigned int ndev)
 710 {
 711         int ret = generic_NCR5380_init_one(&driver_template, pdev, base[ndev],
 712                                            irq[ndev], card[ndev]);
 713         if (ret) {
 714                 if (base[ndev])
 715                         printk(KERN_WARNING "Card not found at address 0x%03x\n",
 716                                base[ndev]);
 717                 return 0;
 718         }
 719
 720         return 1;
 721 }
 722
 723 static int generic_NCR5380_isa_remove(struct device *pdev,
 724                                       unsigned int ndev)
 725 {
 726         generic_NCR5380_release_resources(dev_get_drvdata(pdev));
 727         dev_set_drvdata(pdev, NULL);
 728         return 0;
 729 }
 730
 731 static struct isa_driver generic_NCR5380_isa_driver = {
 732         .match          = generic_NCR5380_isa_match,
 733         .remove         = generic_NCR5380_isa_remove,
 734         .driver         = {
 735                 .name   = DRV_MODULE_NAME
 736         },
 737 };
 738
 739 #ifdef CONFIG_PNP
 740 static const struct pnp_device_id generic_NCR5380_pnp_ids[] = {
 741         { .id = "DTC436e", .driver_data = BOARD_DTC3181E },
 742         { .id = "" }
 743 };
 744 MODULE_DEVICE_TABLE(pnp, generic_NCR5380_pnp_ids);
 745
 746 static int generic_NCR5380_pnp_probe(struct pnp_dev *pdev,
 747                                      const struct pnp_device_id *id)
 748 {
 749         int base, irq;
 750
 751         if (pnp_activate_dev(pdev) < 0)
 752                 return -EBUSY;
 753
 754         base = pnp_port_start(pdev, 0);
 755         irq = pnp_irq(pdev, 0);
 756
 757         return generic_NCR5380_init_one(&driver_template, &pdev->dev, base, irq,
 758                                         id->driver_data);
 759 }
 760
 761 static void generic_NCR5380_pnp_remove(struct pnp_dev *pdev)
 762 {
 763         generic_NCR5380_release_resources(pnp_get_drvdata(pdev));
 764         pnp_set_drvdata(pdev, NULL);
 765 }
 766
 767 static struct pnp_driver generic_NCR5380_pnp_driver = {
 768         .name           = DRV_MODULE_NAME,
 769         .id_table       = generic_NCR5380_pnp_ids,
 770         .probe          = generic_NCR5380_pnp_probe,
 771         .remove         = generic_NCR5380_pnp_remove,
 772 };
 773 #endif /* defined(CONFIG_PNP) */
 774
 775 static int pnp_registered, isa_registered;
 776
 777 static int __init generic_NCR5380_init(void)
 778 {
 779         int ret = 0;
 780
 781         /* compatibility with old-style parameters */
 782         if (irq[0] == -1 && base[0] == 0 && card[0] == -1) {
 783                 irq[0] = ncr_irq;
 784                 base[0] = ncr_addr;
 785                 if (ncr_5380)
 786                         card[0] = BOARD_NCR5380;
 787                 if (ncr_53c400)
 788                         card[0] = BOARD_NCR53C400;
 789                 if (ncr_53c400a)
 790                         card[0] = BOARD_NCR53C400A;
 791                 if (dtc_3181e)
 792                         card[0] = BOARD_DTC3181E;
 793                 if (hp_c2502)
 794                         card[0] = BOARD_HP_C2502;
 795         }
 796
 797 #ifdef CONFIG_PNP
 798         if (!pnp_register_driver(&generic_NCR5380_pnp_driver))
 799                 pnp_registered = 1;
 800 #endif
 801         ret = isa_register_driver(&generic_NCR5380_isa_driver, MAX_CARDS);
 802         if (!ret)
 803                 isa_registered = 1;
 804
 805         return (pnp_registered || isa_registered) ? 0 : ret;
 806 }
 807
 808 static void __exit generic_NCR5380_exit(void)
 809 {
 810 #ifdef CONFIG_PNP
 811         if (pnp_registered)
 812                 pnp_unregister_driver(&generic_NCR5380_pnp_driver);
 813 #endif
 814         if (isa_registered)
 815                 isa_unregister_driver(&generic_NCR5380_isa_driver);
 816 }
 817
 818 module_init(generic_NCR5380_init);
 819 module_exit(generic_NCR5380_exit);