root/drivers/ide/ide-floppy.c

DEFINITIONS

1. ide_floppy_callback
2. ide_floppy_report_error
3. ide_floppy_issue_pc
4. ide_floppy_create_read_capacity_cmd
5. ide_floppy_create_mode_sense_cmd
6. idefloppy_create_rw_cmd
7. idefloppy_blockpc_cmd
8. ide_floppy_do_request
9. ide_floppy_get_flexible_disk_page
10. ide_floppy_get_capacity
11. ide_floppy_setup
12. ide_floppy_flush
13. ide_floppy_init_media

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * IDE ATAPI floppy driver.
   4  *
   5  * Copyright (C) 1996-1999  Gadi Oxman <gadio@netvision.net.il>
   6  * Copyright (C) 2000-2002  Paul Bristow <paul@paulbristow.net>
   7  * Copyright (C) 2005       Bartlomiej Zolnierkiewicz
   8  *
   9  * This driver supports the following IDE floppy drives:
  10  *
  11  * LS-120/240 SuperDisk
  12  * Iomega Zip 100/250
  13  * Iomega PC Card Clik!/PocketZip
  14  *
  15  * For a historical changelog see
  16  * Documentation/ide/ChangeLog.ide-floppy.1996-2002
  17  */
  18 
  19 #include <linux/types.h>
  20 #include <linux/string.h>
  21 #include <linux/kernel.h>
  22 #include <linux/delay.h>
  23 #include <linux/timer.h>
  24 #include <linux/mm.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/major.h>
  27 #include <linux/errno.h>
  28 #include <linux/genhd.h>
  29 #include <linux/cdrom.h>
  30 #include <linux/ide.h>
  31 #include <linux/hdreg.h>
  32 #include <linux/bitops.h>
  33 #include <linux/mutex.h>
  34 #include <linux/scatterlist.h>
  35 
  36 #include <scsi/scsi_ioctl.h>
  37 
  38 #include <asm/byteorder.h>
  39 #include <linux/uaccess.h>
  40 #include <linux/io.h>
  41 #include <asm/unaligned.h>
  42 
  43 #include "ide-floppy.h"
  44 
  45 /*
  46  * After each failed packet command we issue a request sense command and retry
  47  * the packet command IDEFLOPPY_MAX_PC_RETRIES times.
  48  */
  49 #define IDEFLOPPY_MAX_PC_RETRIES        3
  50 
  51 /* format capacities descriptor codes */
  52 #define CAPACITY_INVALID        0x00
  53 #define CAPACITY_UNFORMATTED    0x01
  54 #define CAPACITY_CURRENT        0x02
  55 #define CAPACITY_NO_CARTRIDGE   0x03
  56 
  57 /*
  58  * The following delay solves a problem with ATAPI Zip 100 drive where BSY bit
  59  * was apparently being deasserted before the unit was ready to receive data.
  60  */
  61 #define IDEFLOPPY_PC_DELAY      (HZ/20) /* default delay for ZIP 100 (50ms) */
  62 
  63 static int ide_floppy_callback(ide_drive_t *drive, int dsc)
  64 {
  65         struct ide_disk_obj *floppy = drive->driver_data;
  66         struct ide_atapi_pc *pc = drive->pc;
  67         struct request *rq = pc->rq;
  68         int uptodate = pc->error ? 0 : 1;
  69 
  70         ide_debug_log(IDE_DBG_FUNC, "enter");
  71 
  72         if (drive->failed_pc == pc)
  73                 drive->failed_pc = NULL;
  74 
  75         if (pc->c[0] == GPCMD_READ_10 || pc->c[0] == GPCMD_WRITE_10 ||
  76             blk_rq_is_scsi(rq))
  77                 uptodate = 1; /* FIXME */
  78         else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
  79 
  80                 u8 *buf = bio_data(rq->bio);
  81 
  82                 if (!pc->error) {
  83                         floppy->sense_key = buf[2] & 0x0F;
  84                         floppy->asc = buf[12];
  85                         floppy->ascq = buf[13];
  86                         floppy->progress_indication = buf[15] & 0x80 ?
  87                                 (u16)get_unaligned((u16 *)&buf[16]) : 0x10000;
  88 
  89                         if (drive->failed_pc)
  90                                 ide_debug_log(IDE_DBG_PC, "pc = %x",
  91                                               drive->failed_pc->c[0]);
  92 
  93                         ide_debug_log(IDE_DBG_SENSE, "sense key = %x, asc = %x,"
  94                                       "ascq = %x", floppy->sense_key,
  95                                       floppy->asc, floppy->ascq);
  96                 } else
  97                         printk(KERN_ERR PFX "Error in REQUEST SENSE itself - "
  98                                "Aborting request!\n");
  99         }
 100 
 101         if (ata_misc_request(rq))
 102                 scsi_req(rq)->result = uptodate ? 0 : IDE_DRV_ERROR_GENERAL;
 103 
 104         return uptodate;
 105 }
 106 
 107 static void ide_floppy_report_error(struct ide_disk_obj *floppy,
 108                                     struct ide_atapi_pc *pc)
 109 {
 110         /* suppress error messages resulting from Medium not present */
 111         if (floppy->sense_key == 0x02 &&
 112             floppy->asc       == 0x3a &&
 113             floppy->ascq      == 0x00)
 114                 return;
 115 
 116         printk(KERN_ERR PFX "%s: I/O error, pc = %2x, key = %2x, "
 117                         "asc = %2x, ascq = %2x\n",
 118                         floppy->drive->name, pc->c[0], floppy->sense_key,
 119                         floppy->asc, floppy->ascq);
 120 
 121 }
 122 
 123 static ide_startstop_t ide_floppy_issue_pc(ide_drive_t *drive,
 124                                            struct ide_cmd *cmd,
 125                                            struct ide_atapi_pc *pc)
 126 {
 127         struct ide_disk_obj *floppy = drive->driver_data;
 128 
 129         if (drive->failed_pc == NULL &&
 130             pc->c[0] != GPCMD_REQUEST_SENSE)
 131                 drive->failed_pc = pc;
 132 
 133         /* Set the current packet command */
 134         drive->pc = pc;
 135 
 136         if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES) {
 137                 unsigned int done = blk_rq_bytes(drive->hwif->rq);
 138 
 139                 if (!(pc->flags & PC_FLAG_SUPPRESS_ERROR))
 140                         ide_floppy_report_error(floppy, pc);
 141 
 142                 /* Giving up */
 143                 pc->error = IDE_DRV_ERROR_GENERAL;
 144 
 145                 drive->failed_pc = NULL;
 146                 drive->pc_callback(drive, 0);
 147                 ide_complete_rq(drive, BLK_STS_IOERR, done);
 148                 return ide_stopped;
 149         }
 150 
 151         ide_debug_log(IDE_DBG_FUNC, "retry #%d", pc->retries);
 152 
 153         pc->retries++;
 154 
 155         return ide_issue_pc(drive, cmd);
 156 }
 157 
 158 void ide_floppy_create_read_capacity_cmd(struct ide_atapi_pc *pc)
 159 {
 160         ide_init_pc(pc);
 161         pc->c[0] = GPCMD_READ_FORMAT_CAPACITIES;
 162         pc->c[7] = 255;
 163         pc->c[8] = 255;
 164         pc->req_xfer = 255;
 165 }
 166 
 167 /* A mode sense command is used to "sense" floppy parameters. */
 168 void ide_floppy_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
 169 {
 170         u16 length = 8; /* sizeof(Mode Parameter Header) = 8 Bytes */
 171 
 172         ide_init_pc(pc);
 173         pc->c[0] = GPCMD_MODE_SENSE_10;
 174         pc->c[1] = 0;
 175         pc->c[2] = page_code;
 176 
 177         switch (page_code) {
 178         case IDEFLOPPY_CAPABILITIES_PAGE:
 179                 length += 12;
 180                 break;
 181         case IDEFLOPPY_FLEXIBLE_DISK_PAGE:
 182                 length += 32;
 183                 break;
 184         default:
 185                 printk(KERN_ERR PFX "unsupported page code in %s\n", __func__);
 186         }
 187         put_unaligned(cpu_to_be16(length), (u16 *) &pc->c[7]);
 188         pc->req_xfer = length;
 189 }
 190 
 191 static void idefloppy_create_rw_cmd(ide_drive_t *drive,
 192                                     struct ide_atapi_pc *pc, struct request *rq,
 193                                     unsigned long sector)
 194 {
 195         struct ide_disk_obj *floppy = drive->driver_data;
 196         int block = sector / floppy->bs_factor;
 197         int blocks = blk_rq_sectors(rq) / floppy->bs_factor;
 198         int cmd = rq_data_dir(rq);
 199 
 200         ide_debug_log(IDE_DBG_FUNC, "block: %d, blocks: %d", block, blocks);
 201 
 202         ide_init_pc(pc);
 203         pc->c[0] = cmd == READ ? GPCMD_READ_10 : GPCMD_WRITE_10;
 204         put_unaligned(cpu_to_be16(blocks), (unsigned short *)&pc->c[7]);
 205         put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[2]);
 206 
 207         memcpy(scsi_req(rq)->cmd, pc->c, 12);
 208 
 209         pc->rq = rq;
 210         if (cmd == WRITE)
 211                 pc->flags |= PC_FLAG_WRITING;
 212 
 213         pc->flags |= PC_FLAG_DMA_OK;
 214 }
 215 
 216 static void idefloppy_blockpc_cmd(struct ide_disk_obj *floppy,
 217                 struct ide_atapi_pc *pc, struct request *rq)
 218 {
 219         ide_init_pc(pc);
 220         memcpy(pc->c, scsi_req(rq)->cmd, sizeof(pc->c));
 221         pc->rq = rq;
 222         if (blk_rq_bytes(rq)) {
 223                 pc->flags |= PC_FLAG_DMA_OK;
 224                 if (rq_data_dir(rq) == WRITE)
 225                         pc->flags |= PC_FLAG_WRITING;
 226         }
 227 }
 228 
 229 static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
 230                                              struct request *rq, sector_t block)
 231 {
 232         struct ide_disk_obj *floppy = drive->driver_data;
 233         struct ide_cmd cmd;
 234         struct ide_atapi_pc *pc;
 235 
 236         ide_debug_log(IDE_DBG_FUNC, "enter, cmd: 0x%x\n", rq->cmd[0]);
 237 
 238         if (drive->debug_mask & IDE_DBG_RQ)
 239                 blk_dump_rq_flags(rq, (rq->rq_disk
 240                                         ? rq->rq_disk->disk_name
 241                                         : "dev?"));
 242 
 243         if (scsi_req(rq)->result >= ERROR_MAX) {
 244                 if (drive->failed_pc) {
 245                         ide_floppy_report_error(floppy, drive->failed_pc);
 246                         drive->failed_pc = NULL;
 247                 } else
 248                         printk(KERN_ERR PFX "%s: I/O error\n", drive->name);
 249 
 250                 if (ata_misc_request(rq)) {
 251                         scsi_req(rq)->result = 0;
 252                         ide_complete_rq(drive, BLK_STS_OK, blk_rq_bytes(rq));
 253                         return ide_stopped;
 254                 } else
 255                         goto out_end;
 256         }
 257 
 258         switch (req_op(rq)) {
 259         default:
 260                 if (((long)blk_rq_pos(rq) % floppy->bs_factor) ||
 261                     (blk_rq_sectors(rq) % floppy->bs_factor)) {
 262                         printk(KERN_ERR PFX "%s: unsupported r/w rq size\n",
 263                                 drive->name);
 264                         goto out_end;
 265                 }
 266                 pc = &floppy->queued_pc;
 267                 idefloppy_create_rw_cmd(drive, pc, rq, (unsigned long)block);
 268                 break;
 269         case REQ_OP_SCSI_IN:
 270         case REQ_OP_SCSI_OUT:
 271                 pc = &floppy->queued_pc;
 272                 idefloppy_blockpc_cmd(floppy, pc, rq);
 273                 break;
 274         case REQ_OP_DRV_IN:
 275         case REQ_OP_DRV_OUT:
 276                 switch (ide_req(rq)->type) {
 277                 case ATA_PRIV_MISC:
 278                 case ATA_PRIV_SENSE:
 279                         pc = (struct ide_atapi_pc *)ide_req(rq)->special;
 280                         break;
 281                 default:
 282                         BUG();
 283                 }
 284         }
 285 
 286         ide_prep_sense(drive, rq);
 287 
 288         memset(&cmd, 0, sizeof(cmd));
 289 
 290         if (rq_data_dir(rq))
 291                 cmd.tf_flags |= IDE_TFLAG_WRITE;
 292 
 293         cmd.rq = rq;
 294 
 295         if (!blk_rq_is_passthrough(rq) || blk_rq_bytes(rq)) {
 296                 ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
 297                 ide_map_sg(drive, &cmd);
 298         }
 299 
 300         pc->rq = rq;
 301 
 302         return ide_floppy_issue_pc(drive, &cmd, pc);
 303 out_end:
 304         drive->failed_pc = NULL;
 305         if (blk_rq_is_passthrough(rq) && scsi_req(rq)->result == 0)
 306                 scsi_req(rq)->result = -EIO;
 307         ide_complete_rq(drive, BLK_STS_IOERR, blk_rq_bytes(rq));
 308         return ide_stopped;
 309 }
 310 
 311 /*
 312  * Look at the flexible disk page parameters. We ignore the CHS capacity
 313  * parameters and use the LBA parameters instead.
 314  */
 315 static int ide_floppy_get_flexible_disk_page(ide_drive_t *drive,
 316                                              struct ide_atapi_pc *pc)
 317 {
 318         struct ide_disk_obj *floppy = drive->driver_data;
 319         struct gendisk *disk = floppy->disk;
 320         u8 *page, buf[40];
 321         int capacity, lba_capacity;
 322         u16 transfer_rate, sector_size, cyls, rpm;
 323         u8 heads, sectors;
 324 
 325         ide_floppy_create_mode_sense_cmd(pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE);
 326 
 327         if (ide_queue_pc_tail(drive, disk, pc, buf, pc->req_xfer)) {
 328                 printk(KERN_ERR PFX "Can't get flexible disk page params\n");
 329                 return 1;
 330         }
 331 
 332         if (buf[3] & 0x80)
 333                 drive->dev_flags |= IDE_DFLAG_WP;
 334         else
 335                 drive->dev_flags &= ~IDE_DFLAG_WP;
 336 
 337         set_disk_ro(disk, !!(drive->dev_flags & IDE_DFLAG_WP));
 338 
 339         page = &buf[8];
 340 
 341         transfer_rate = be16_to_cpup((__be16 *)&buf[8 + 2]);
 342         sector_size   = be16_to_cpup((__be16 *)&buf[8 + 6]);
 343         cyls          = be16_to_cpup((__be16 *)&buf[8 + 8]);
 344         rpm           = be16_to_cpup((__be16 *)&buf[8 + 28]);
 345         heads         = buf[8 + 4];
 346         sectors       = buf[8 + 5];
 347 
 348         capacity = cyls * heads * sectors * sector_size;
 349 
 350         if (memcmp(page, &floppy->flexible_disk_page, 32))
 351                 printk(KERN_INFO PFX "%s: %dkB, %d/%d/%d CHS, %d kBps, "
 352                                 "%d sector size, %d rpm\n",
 353                                 drive->name, capacity / 1024, cyls, heads,
 354                                 sectors, transfer_rate / 8, sector_size, rpm);
 355 
 356         memcpy(&floppy->flexible_disk_page, page, 32);
 357         drive->bios_cyl = cyls;
 358         drive->bios_head = heads;
 359         drive->bios_sect = sectors;
 360         lba_capacity = floppy->blocks * floppy->block_size;
 361 
 362         if (capacity < lba_capacity) {
 363                 printk(KERN_NOTICE PFX "%s: The disk reports a capacity of %d "
 364                         "bytes, but the drive only handles %d\n",
 365                         drive->name, lba_capacity, capacity);
 366                 floppy->blocks = floppy->block_size ?
 367                         capacity / floppy->block_size : 0;
 368                 drive->capacity64 = floppy->blocks * floppy->bs_factor;
 369         }
 370 
 371         return 0;
 372 }
 373 
 374 /*
 375  * Determine if a media is present in the floppy drive, and if so, its LBA
 376  * capacity.
 377  */
 378 static int ide_floppy_get_capacity(ide_drive_t *drive)
 379 {
 380         struct ide_disk_obj *floppy = drive->driver_data;
 381         struct gendisk *disk = floppy->disk;
 382         struct ide_atapi_pc pc;
 383         u8 *cap_desc;
 384         u8 pc_buf[256], header_len, desc_cnt;
 385         int i, rc = 1, blocks, length;
 386 
 387         ide_debug_log(IDE_DBG_FUNC, "enter");
 388 
 389         drive->bios_cyl = 0;
 390         drive->bios_head = drive->bios_sect = 0;
 391         floppy->blocks = 0;
 392         floppy->bs_factor = 1;
 393         drive->capacity64 = 0;
 394 
 395         ide_floppy_create_read_capacity_cmd(&pc);
 396         if (ide_queue_pc_tail(drive, disk, &pc, pc_buf, pc.req_xfer)) {
 397                 printk(KERN_ERR PFX "Can't get floppy parameters\n");
 398                 return 1;
 399         }
 400         header_len = pc_buf[3];
 401         cap_desc = &pc_buf[4];
 402         desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
 403 
 404         for (i = 0; i < desc_cnt; i++) {
 405                 unsigned int desc_start = 4 + i*8;
 406 
 407                 blocks = be32_to_cpup((__be32 *)&pc_buf[desc_start]);
 408                 length = be16_to_cpup((__be16 *)&pc_buf[desc_start + 6]);
 409 
 410                 ide_debug_log(IDE_DBG_PROBE, "Descriptor %d: %dkB, %d blocks, "
 411                                              "%d sector size",
 412                                              i, blocks * length / 1024,
 413                                              blocks, length);
 414 
 415                 if (i)
 416                         continue;
 417                 /*
 418                  * the code below is valid only for the 1st descriptor, ie i=0
 419                  */
 420 
 421                 switch (pc_buf[desc_start + 4] & 0x03) {
 422                 /* Clik! drive returns this instead of CAPACITY_CURRENT */
 423                 case CAPACITY_UNFORMATTED:
 424                         if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
 425                                 /*
 426                                  * If it is not a clik drive, break out
 427                                  * (maintains previous driver behaviour)
 428                                  */
 429                                 break;
 430                         /* fall through */
 431                 case CAPACITY_CURRENT:
 432                         /* Normal Zip/LS-120 disks */
 433                         if (memcmp(cap_desc, &floppy->cap_desc, 8))
 434                                 printk(KERN_INFO PFX "%s: %dkB, %d blocks, %d "
 435                                        "sector size\n",
 436                                        drive->name, blocks * length / 1024,
 437                                        blocks, length);
 438                         memcpy(&floppy->cap_desc, cap_desc, 8);
 439 
 440                         if (!length || length % 512) {
 441                                 printk(KERN_NOTICE PFX "%s: %d bytes block size"
 442                                        " not supported\n", drive->name, length);
 443                         } else {
 444                                 floppy->blocks = blocks;
 445                                 floppy->block_size = length;
 446                                 floppy->bs_factor = length / 512;
 447                                 if (floppy->bs_factor != 1)
 448                                         printk(KERN_NOTICE PFX "%s: Warning: "
 449                                                "non 512 bytes block size not "
 450                                                "fully supported\n",
 451                                                drive->name);
 452                                 drive->capacity64 =
 453                                         floppy->blocks * floppy->bs_factor;
 454                                 rc = 0;
 455                         }
 456                         break;
 457                 case CAPACITY_NO_CARTRIDGE:
 458                         /*
 459                          * This is a KERN_ERR so it appears on screen
 460                          * for the user to see
 461                          */
 462                         printk(KERN_ERR PFX "%s: No disk in drive\n",
 463                                drive->name);
 464                         break;
 465                 case CAPACITY_INVALID:
 466                         printk(KERN_ERR PFX "%s: Invalid capacity for disk "
 467                                 "in drive\n", drive->name);
 468                         break;
 469                 }
 470                 ide_debug_log(IDE_DBG_PROBE, "Descriptor 0 Code: %d",
 471                                              pc_buf[desc_start + 4] & 0x03);
 472         }
 473 
 474         /* Clik! disk does not support get_flexible_disk_page */
 475         if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
 476                 (void) ide_floppy_get_flexible_disk_page(drive, &pc);
 477 
 478         return rc;
 479 }
 480 
 481 static void ide_floppy_setup(ide_drive_t *drive)
 482 {
 483         struct ide_disk_obj *floppy = drive->driver_data;
 484         u16 *id = drive->id;
 485 
 486         drive->pc_callback       = ide_floppy_callback;
 487 
 488         /*
 489          * We used to check revisions here. At this point however I'm giving up.
 490          * Just assume they are all broken, its easier.
 491          *
 492          * The actual reason for the workarounds was likely a driver bug after
 493          * all rather than a firmware bug, and the workaround below used to hide
 494          * it. It should be fixed as of version 1.9, but to be on the safe side
 495          * we'll leave the limitation below for the 2.2.x tree.
 496          */
 497         if (strstarts((char *)&id[ATA_ID_PROD], "IOMEGA ZIP 100 ATAPI")) {
 498                 drive->atapi_flags |= IDE_AFLAG_ZIP_DRIVE;
 499                 /* This value will be visible in the /proc/ide/hdx/settings */
 500                 drive->pc_delay = IDEFLOPPY_PC_DELAY;
 501                 blk_queue_max_hw_sectors(drive->queue, 64);
 502         }
 503 
 504         /*
 505          * Guess what? The IOMEGA Clik! drive also needs the above fix. It makes
 506          * nasty clicking noises without it, so please don't remove this.
 507          */
 508         if (strstarts((char *)&id[ATA_ID_PROD], "IOMEGA Clik!")) {
 509                 blk_queue_max_hw_sectors(drive->queue, 64);
 510                 drive->atapi_flags |= IDE_AFLAG_CLIK_DRIVE;
 511                 /* IOMEGA Clik! drives do not support lock/unlock commands */
 512                 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
 513         }
 514 
 515         (void) ide_floppy_get_capacity(drive);
 516 
 517         ide_proc_register_driver(drive, floppy->driver);
 518 
 519         drive->dev_flags |= IDE_DFLAG_ATTACH;
 520 }
 521 
 522 static void ide_floppy_flush(ide_drive_t *drive)
 523 {
 524 }
 525 
 526 static int ide_floppy_init_media(ide_drive_t *drive, struct gendisk *disk)
 527 {
 528         int ret = 0;
 529 
 530         if (ide_do_test_unit_ready(drive, disk))
 531                 ide_do_start_stop(drive, disk, 1);
 532 
 533         ret = ide_floppy_get_capacity(drive);
 534 
 535         set_capacity(disk, ide_gd_capacity(drive));
 536 
 537         return ret;
 538 }
 539 
 540 const struct ide_disk_ops ide_atapi_disk_ops = {
 541         .check          = ide_check_atapi_device,
 542         .get_capacity   = ide_floppy_get_capacity,
 543         .setup          = ide_floppy_setup,
 544         .flush          = ide_floppy_flush,
 545         .init_media     = ide_floppy_init_media,
 546         .set_doorlock   = ide_set_media_lock,
 547         .do_request     = ide_floppy_do_request,
 548         .ioctl          = ide_floppy_ioctl,
 549 };