linux/drivers/scsi/mac_scsi.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Generic Macintosh NCR5380 driver
   4 *
   5 * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
   6 *
   7 * Copyright 2019 Finn Thain
   8 *
   9 * derived in part from:
  10 */
  11/*
  12 * Generic Generic NCR5380 driver
  13 *
  14 * Copyright 1995, Russell King
  15 */
  16
  17#include <linux/delay.h>
  18#include <linux/types.h>
  19#include <linux/module.h>
  20#include <linux/ioport.h>
  21#include <linux/init.h>
  22#include <linux/blkdev.h>
  23#include <linux/interrupt.h>
  24#include <linux/platform_device.h>
  25
  26#include <asm/hwtest.h>
  27#include <asm/io.h>
  28#include <asm/macintosh.h>
  29#include <asm/macints.h>
  30#include <asm/setup.h>
  31
  32#include <scsi/scsi_host.h>
  33
  34/* Definitions for the core NCR5380 driver. */
  35
  36#define NCR5380_implementation_fields   int pdma_residual
  37
  38#define NCR5380_read(reg)           in_8(hostdata->io + ((reg) << 4))
  39#define NCR5380_write(reg, value)   out_8(hostdata->io + ((reg) << 4), value)
  40
  41#define NCR5380_dma_xfer_len            macscsi_dma_xfer_len
  42#define NCR5380_dma_recv_setup          macscsi_pread
  43#define NCR5380_dma_send_setup          macscsi_pwrite
  44#define NCR5380_dma_residual            macscsi_dma_residual
  45
  46#define NCR5380_intr                    macscsi_intr
  47#define NCR5380_queue_command           macscsi_queue_command
  48#define NCR5380_abort                   macscsi_abort
  49#define NCR5380_host_reset              macscsi_host_reset
  50#define NCR5380_info                    macscsi_info
  51
  52#include "NCR5380.h"
  53
  54static int setup_can_queue = -1;
  55module_param(setup_can_queue, int, 0);
  56static int setup_cmd_per_lun = -1;
  57module_param(setup_cmd_per_lun, int, 0);
  58static int setup_sg_tablesize = -1;
  59module_param(setup_sg_tablesize, int, 0);
  60static int setup_use_pdma = 512;
  61module_param(setup_use_pdma, int, 0);
  62static int setup_hostid = -1;
  63module_param(setup_hostid, int, 0);
  64static int setup_toshiba_delay = -1;
  65module_param(setup_toshiba_delay, int, 0);
  66
  67#ifndef MODULE
  68static int __init mac_scsi_setup(char *str)
  69{
  70        int ints[8];
  71
  72        (void)get_options(str, ARRAY_SIZE(ints), ints);
  73
  74        if (ints[0] < 1) {
  75                pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>[,<toshiba_delay>]]]]]]\n");
  76                return 0;
  77        }
  78        if (ints[0] >= 1)
  79                setup_can_queue = ints[1];
  80        if (ints[0] >= 2)
  81                setup_cmd_per_lun = ints[2];
  82        if (ints[0] >= 3)
  83                setup_sg_tablesize = ints[3];
  84        if (ints[0] >= 4)
  85                setup_hostid = ints[4];
  86        /* ints[5] (use_tagged_queuing) is ignored */
  87        if (ints[0] >= 6)
  88                setup_use_pdma = ints[6];
  89        if (ints[0] >= 7)
  90                setup_toshiba_delay = ints[7];
  91        return 1;
  92}
  93
  94__setup("mac5380=", mac_scsi_setup);
  95#endif /* !MODULE */
  96
  97/*
  98 * According to "Inside Macintosh: Devices", Mac OS requires disk drivers to
  99 * specify the number of bytes between the delays expected from a SCSI target.
 100 * This allows the operating system to "prevent bus errors when a target fails
 101 * to deliver the next byte within the processor bus error timeout period."
 102 * Linux SCSI drivers lack knowledge of the timing behaviour of SCSI targets
 103 * so bus errors are unavoidable.
 104 *
 105 * If a MOVE.B instruction faults, we assume that zero bytes were transferred
 106 * and simply retry. That assumption probably depends on target behaviour but
 107 * seems to hold up okay. The NOP provides synchronization: without it the
 108 * fault can sometimes occur after the program counter has moved past the
 109 * offending instruction. Post-increment addressing can't be used.
 110 */
 111
 112#define MOVE_BYTE(operands) \
 113        asm volatile ( \
 114                "1:     moveb " operands "     \n" \
 115                "11:    nop                    \n" \
 116                "       addq #1,%0             \n" \
 117                "       subq #1,%1             \n" \
 118                "40:                           \n" \
 119                "                              \n" \
 120                ".section .fixup,\"ax\"        \n" \
 121                ".even                         \n" \
 122                "90:    movel #1, %2           \n" \
 123                "       jra 40b                \n" \
 124                ".previous                     \n" \
 125                "                              \n" \
 126                ".section __ex_table,\"a\"     \n" \
 127                ".align  4                     \n" \
 128                ".long   1b,90b                \n" \
 129                ".long  11b,90b                \n" \
 130                ".previous                     \n" \
 131                : "+a" (addr), "+r" (n), "+r" (result) : "a" (io))
 132
 133/*
 134 * If a MOVE.W (or MOVE.L) instruction faults, it cannot be retried because
 135 * the residual byte count would be uncertain. In that situation the MOVE_WORD
 136 * macro clears n in the fixup section to abort the transfer.
 137 */
 138
 139#define MOVE_WORD(operands) \
 140        asm volatile ( \
 141                "1:     movew " operands "     \n" \
 142                "11:    nop                    \n" \
 143                "       subq #2,%1             \n" \
 144                "40:                           \n" \
 145                "                              \n" \
 146                ".section .fixup,\"ax\"        \n" \
 147                ".even                         \n" \
 148                "90:    movel #0, %1           \n" \
 149                "       movel #2, %2           \n" \
 150                "       jra 40b                \n" \
 151                ".previous                     \n" \
 152                "                              \n" \
 153                ".section __ex_table,\"a\"     \n" \
 154                ".align  4                     \n" \
 155                ".long   1b,90b                \n" \
 156                ".long  11b,90b                \n" \
 157                ".previous                     \n" \
 158                : "+a" (addr), "+r" (n), "+r" (result) : "a" (io))
 159
 160#define MOVE_16_WORDS(operands) \
 161        asm volatile ( \
 162                "1:     movew " operands "     \n" \
 163                "2:     movew " operands "     \n" \
 164                "3:     movew " operands "     \n" \
 165                "4:     movew " operands "     \n" \
 166                "5:     movew " operands "     \n" \
 167                "6:     movew " operands "     \n" \
 168                "7:     movew " operands "     \n" \
 169                "8:     movew " operands "     \n" \
 170                "9:     movew " operands "     \n" \
 171                "10:    movew " operands "     \n" \
 172                "11:    movew " operands "     \n" \
 173                "12:    movew " operands "     \n" \
 174                "13:    movew " operands "     \n" \
 175                "14:    movew " operands "     \n" \
 176                "15:    movew " operands "     \n" \
 177                "16:    movew " operands "     \n" \
 178                "17:    nop                    \n" \
 179                "       subl  #32,%1           \n" \
 180                "40:                           \n" \
 181                "                              \n" \
 182                ".section .fixup,\"ax\"        \n" \
 183                ".even                         \n" \
 184                "90:    movel #0, %1           \n" \
 185                "       movel #2, %2           \n" \
 186                "       jra 40b                \n" \
 187                ".previous                     \n" \
 188                "                              \n" \
 189                ".section __ex_table,\"a\"     \n" \
 190                ".align  4                     \n" \
 191                ".long   1b,90b                \n" \
 192                ".long   2b,90b                \n" \
 193                ".long   3b,90b                \n" \
 194                ".long   4b,90b                \n" \
 195                ".long   5b,90b                \n" \
 196                ".long   6b,90b                \n" \
 197                ".long   7b,90b                \n" \
 198                ".long   8b,90b                \n" \
 199                ".long   9b,90b                \n" \
 200                ".long  10b,90b                \n" \
 201                ".long  11b,90b                \n" \
 202                ".long  12b,90b                \n" \
 203                ".long  13b,90b                \n" \
 204                ".long  14b,90b                \n" \
 205                ".long  15b,90b                \n" \
 206                ".long  16b,90b                \n" \
 207                ".long  17b,90b                \n" \
 208                ".previous                     \n" \
 209                : "+a" (addr), "+r" (n), "+r" (result) : "a" (io))
 210
 211#define MAC_PDMA_DELAY          32
 212
 213static inline int mac_pdma_recv(void __iomem *io, unsigned char *start, int n)
 214{
 215        unsigned char *addr = start;
 216        int result = 0;
 217
 218        if (n >= 1) {
 219                MOVE_BYTE("%3@,%0@");
 220                if (result)
 221                        goto out;
 222        }
 223        if (n >= 1 && ((unsigned long)addr & 1)) {
 224                MOVE_BYTE("%3@,%0@");
 225                if (result)
 226                        goto out;
 227        }
 228        while (n >= 32)
 229                MOVE_16_WORDS("%3@,%0@+");
 230        while (n >= 2)
 231                MOVE_WORD("%3@,%0@+");
 232        if (result)
 233                return start - addr; /* Negated to indicate uncertain length */
 234        if (n == 1)
 235                MOVE_BYTE("%3@,%0@");
 236out:
 237        return addr - start;
 238}
 239
 240static inline int mac_pdma_send(unsigned char *start, void __iomem *io, int n)
 241{
 242        unsigned char *addr = start;
 243        int result = 0;
 244
 245        if (n >= 1) {
 246                MOVE_BYTE("%0@,%3@");
 247                if (result)
 248                        goto out;
 249        }
 250        if (n >= 1 && ((unsigned long)addr & 1)) {
 251                MOVE_BYTE("%0@,%3@");
 252                if (result)
 253                        goto out;
 254        }
 255        while (n >= 32)
 256                MOVE_16_WORDS("%0@+,%3@");
 257        while (n >= 2)
 258                MOVE_WORD("%0@+,%3@");
 259        if (result)
 260                return start - addr; /* Negated to indicate uncertain length */
 261        if (n == 1)
 262                MOVE_BYTE("%0@,%3@");
 263out:
 264        return addr - start;
 265}
 266
 267/* The "SCSI DMA" chip on the IIfx implements this register. */
 268#define CTRL_REG                0x8
 269#define CTRL_INTERRUPTS_ENABLE  BIT(1)
 270#define CTRL_HANDSHAKE_MODE     BIT(3)
 271
 272static inline void write_ctrl_reg(struct NCR5380_hostdata *hostdata, u32 value)
 273{
 274        out_be32(hostdata->io + (CTRL_REG << 4), value);
 275}
 276
 277static inline int macscsi_pread(struct NCR5380_hostdata *hostdata,
 278                                unsigned char *dst, int len)
 279{
 280        u8 __iomem *s = hostdata->pdma_io + (INPUT_DATA_REG << 4);
 281        unsigned char *d = dst;
 282        int result = 0;
 283
 284        hostdata->pdma_residual = len;
 285
 286        while (!NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
 287                                      BASR_DRQ | BASR_PHASE_MATCH,
 288                                      BASR_DRQ | BASR_PHASE_MATCH, 0)) {
 289                int bytes;
 290
 291                if (macintosh_config->ident == MAC_MODEL_IIFX)
 292                        write_ctrl_reg(hostdata, CTRL_HANDSHAKE_MODE |
 293                                                 CTRL_INTERRUPTS_ENABLE);
 294
 295                bytes = mac_pdma_recv(s, d, min(hostdata->pdma_residual, 512));
 296
 297                if (bytes > 0) {
 298                        d += bytes;
 299                        hostdata->pdma_residual -= bytes;
 300                }
 301
 302                if (hostdata->pdma_residual == 0)
 303                        goto out;
 304
 305                if (NCR5380_poll_politely2(hostdata, STATUS_REG, SR_REQ, SR_REQ,
 306                                           BUS_AND_STATUS_REG, BASR_ACK,
 307                                           BASR_ACK, 0) < 0)
 308                        scmd_printk(KERN_DEBUG, hostdata->connected,
 309                                    "%s: !REQ and !ACK\n", __func__);
 310                if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH))
 311                        goto out;
 312
 313                if (bytes == 0)
 314                        udelay(MAC_PDMA_DELAY);
 315
 316                if (bytes >= 0)
 317                        continue;
 318
 319                dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host,
 320                         "%s: bus error (%d/%d)\n", __func__, d - dst, len);
 321                NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
 322                result = -1;
 323                goto out;
 324        }
 325
 326        scmd_printk(KERN_ERR, hostdata->connected,
 327                    "%s: phase mismatch or !DRQ\n", __func__);
 328        NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
 329        result = -1;
 330out:
 331        if (macintosh_config->ident == MAC_MODEL_IIFX)
 332                write_ctrl_reg(hostdata, CTRL_INTERRUPTS_ENABLE);
 333        return result;
 334}
 335
 336static inline int macscsi_pwrite(struct NCR5380_hostdata *hostdata,
 337                                 unsigned char *src, int len)
 338{
 339        unsigned char *s = src;
 340        u8 __iomem *d = hostdata->pdma_io + (OUTPUT_DATA_REG << 4);
 341        int result = 0;
 342
 343        hostdata->pdma_residual = len;
 344
 345        while (!NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
 346                                      BASR_DRQ | BASR_PHASE_MATCH,
 347                                      BASR_DRQ | BASR_PHASE_MATCH, 0)) {
 348                int bytes;
 349
 350                if (macintosh_config->ident == MAC_MODEL_IIFX)
 351                        write_ctrl_reg(hostdata, CTRL_HANDSHAKE_MODE |
 352                                                 CTRL_INTERRUPTS_ENABLE);
 353
 354                bytes = mac_pdma_send(s, d, min(hostdata->pdma_residual, 512));
 355
 356                if (bytes > 0) {
 357                        s += bytes;
 358                        hostdata->pdma_residual -= bytes;
 359                }
 360
 361                if (hostdata->pdma_residual == 0) {
 362                        if (NCR5380_poll_politely(hostdata, TARGET_COMMAND_REG,
 363                                                  TCR_LAST_BYTE_SENT,
 364                                                  TCR_LAST_BYTE_SENT,
 365                                                  0) < 0) {
 366                                scmd_printk(KERN_ERR, hostdata->connected,
 367                                            "%s: Last Byte Sent timeout\n", __func__);
 368                                result = -1;
 369                        }
 370                        goto out;
 371                }
 372
 373                if (NCR5380_poll_politely2(hostdata, STATUS_REG, SR_REQ, SR_REQ,
 374                                           BUS_AND_STATUS_REG, BASR_ACK,
 375                                           BASR_ACK, 0) < 0)
 376                        scmd_printk(KERN_DEBUG, hostdata->connected,
 377                                    "%s: !REQ and !ACK\n", __func__);
 378                if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH))
 379                        goto out;
 380
 381                if (bytes == 0)
 382                        udelay(MAC_PDMA_DELAY);
 383
 384                if (bytes >= 0)
 385                        continue;
 386
 387                dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host,
 388                         "%s: bus error (%d/%d)\n", __func__, s - src, len);
 389                NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
 390                result = -1;
 391                goto out;
 392        }
 393
 394        scmd_printk(KERN_ERR, hostdata->connected,
 395                    "%s: phase mismatch or !DRQ\n", __func__);
 396        NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
 397        result = -1;
 398out:
 399        if (macintosh_config->ident == MAC_MODEL_IIFX)
 400                write_ctrl_reg(hostdata, CTRL_INTERRUPTS_ENABLE);
 401        return result;
 402}
 403
 404static int macscsi_dma_xfer_len(struct NCR5380_hostdata *hostdata,
 405                                struct scsi_cmnd *cmd)
 406{
 407        if (hostdata->flags & FLAG_NO_PSEUDO_DMA ||
 408            cmd->SCp.this_residual < setup_use_pdma)
 409                return 0;
 410
 411        return cmd->SCp.this_residual;
 412}
 413
 414static int macscsi_dma_residual(struct NCR5380_hostdata *hostdata)
 415{
 416        return hostdata->pdma_residual;
 417}
 418
 419#include "NCR5380.c"
 420
 421#define DRV_MODULE_NAME         "mac_scsi"
 422#define PFX                     DRV_MODULE_NAME ": "
 423
 424static struct scsi_host_template mac_scsi_template = {
 425        .module                 = THIS_MODULE,
 426        .proc_name              = DRV_MODULE_NAME,
 427        .name                   = "Macintosh NCR5380 SCSI",
 428        .info                   = macscsi_info,
 429        .queuecommand           = macscsi_queue_command,
 430        .eh_abort_handler       = macscsi_abort,
 431        .eh_host_reset_handler  = macscsi_host_reset,
 432        .can_queue              = 16,
 433        .this_id                = 7,
 434        .sg_tablesize           = 1,
 435        .cmd_per_lun            = 2,
 436        .dma_boundary           = PAGE_SIZE - 1,
 437        .cmd_size               = NCR5380_CMD_SIZE,
 438        .max_sectors            = 128,
 439};
 440
 441static int __init mac_scsi_probe(struct platform_device *pdev)
 442{
 443        struct Scsi_Host *instance;
 444        struct NCR5380_hostdata *hostdata;
 445        int error;
 446        int host_flags = 0;
 447        struct resource *irq, *pio_mem, *pdma_mem = NULL;
 448
 449        pio_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 450        if (!pio_mem)
 451                return -ENODEV;
 452
 453        pdma_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 454
 455        irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 456
 457        if (!hwreg_present((unsigned char *)pio_mem->start +
 458                           (STATUS_REG << 4))) {
 459                pr_info(PFX "no device detected at %pap\n", &pio_mem->start);
 460                return -ENODEV;
 461        }
 462
 463        if (setup_can_queue > 0)
 464                mac_scsi_template.can_queue = setup_can_queue;
 465        if (setup_cmd_per_lun > 0)
 466                mac_scsi_template.cmd_per_lun = setup_cmd_per_lun;
 467        if (setup_sg_tablesize > 0)
 468                mac_scsi_template.sg_tablesize = setup_sg_tablesize;
 469        if (setup_hostid >= 0)
 470                mac_scsi_template.this_id = setup_hostid & 7;
 471
 472        instance = scsi_host_alloc(&mac_scsi_template,
 473                                   sizeof(struct NCR5380_hostdata));
 474        if (!instance)
 475                return -ENOMEM;
 476
 477        if (irq)
 478                instance->irq = irq->start;
 479        else
 480                instance->irq = NO_IRQ;
 481
 482        hostdata = shost_priv(instance);
 483        hostdata->base = pio_mem->start;
 484        hostdata->io = (u8 __iomem *)pio_mem->start;
 485
 486        if (pdma_mem && setup_use_pdma)
 487                hostdata->pdma_io = (u8 __iomem *)pdma_mem->start;
 488        else
 489                host_flags |= FLAG_NO_PSEUDO_DMA;
 490
 491        host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0;
 492
 493        error = NCR5380_init(instance, host_flags | FLAG_LATE_DMA_SETUP);
 494        if (error)
 495                goto fail_init;
 496
 497        if (instance->irq != NO_IRQ) {
 498                error = request_irq(instance->irq, macscsi_intr, IRQF_SHARED,
 499                                    "NCR5380", instance);
 500                if (error)
 501                        goto fail_irq;
 502        }
 503
 504        NCR5380_maybe_reset_bus(instance);
 505
 506        error = scsi_add_host(instance, NULL);
 507        if (error)
 508                goto fail_host;
 509
 510        platform_set_drvdata(pdev, instance);
 511
 512        scsi_scan_host(instance);
 513        return 0;
 514
 515fail_host:
 516        if (instance->irq != NO_IRQ)
 517                free_irq(instance->irq, instance);
 518fail_irq:
 519        NCR5380_exit(instance);
 520fail_init:
 521        scsi_host_put(instance);
 522        return error;
 523}
 524
 525static int __exit mac_scsi_remove(struct platform_device *pdev)
 526{
 527        struct Scsi_Host *instance = platform_get_drvdata(pdev);
 528
 529        scsi_remove_host(instance);
 530        if (instance->irq != NO_IRQ)
 531                free_irq(instance->irq, instance);
 532        NCR5380_exit(instance);
 533        scsi_host_put(instance);
 534        return 0;
 535}
 536
 537static struct platform_driver mac_scsi_driver = {
 538        .remove = __exit_p(mac_scsi_remove),
 539        .driver = {
 540                .name   = DRV_MODULE_NAME,
 541        },
 542};
 543
 544module_platform_driver_probe(mac_scsi_driver, mac_scsi_probe);
 545
 546MODULE_ALIAS("platform:" DRV_MODULE_NAME);
 547MODULE_LICENSE("GPL");
 548