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