SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/ide/ide-atapi.c

   1 /*
   2  * ATAPI support.
   3  */
   4
   5 #include <linux/kernel.h>
   6 #include <linux/delay.h>
   7 #include <linux/ide.h>
   8 #include <scsi/scsi.h>
   9
  10 #ifdef DEBUG
  11 #define debug_log(fmt, args...) \
  12         printk(KERN_INFO "ide: " fmt, ## args)
  13 #else
  14 #define debug_log(fmt, args...) do {} while (0)
  15 #endif
  16
  17 /*
  18  * Check whether we can support a device,
  19  * based on the ATAPI IDENTIFY command results.
  20  */
  21 int ide_check_atapi_device(ide_drive_t *drive, const char *s)
  22 {
  23         u16 *id = drive->id;
  24         u8 gcw[2], protocol, device_type, removable, drq_type, packet_size;
  25
  26         *((u16 *)&gcw) = id[ATA_ID_CONFIG];
  27
  28         protocol    = (gcw[1] & 0xC0) >> 6;
  29         device_type =  gcw[1] & 0x1F;
  30         removable   = (gcw[0] & 0x80) >> 7;
  31         drq_type    = (gcw[0] & 0x60) >> 5;
  32         packet_size =  gcw[0] & 0x03;
  33
  34 #ifdef CONFIG_PPC
  35         /* kludge for Apple PowerBook internal zip */
  36         if (drive->media == ide_floppy && device_type == 5 &&
  37             !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&
  38             strstr((char *)&id[ATA_ID_PROD], "ZIP"))
  39                 device_type = 0;
  40 #endif
  41
  42         if (protocol != 2)
  43                 printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",
  44                         s, drive->name, protocol);
  45         else if ((drive->media == ide_floppy && device_type != 0) ||
  46                  (drive->media == ide_tape && device_type != 1))
  47                 printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",
  48                         s, drive->name, device_type);
  49         else if (removable == 0)
  50                 printk(KERN_ERR "%s: %s: the removable flag is not set\n",
  51                         s, drive->name);
  52         else if (drive->media == ide_floppy && drq_type == 3)
  53                 printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not "
  54                         "supported\n", s, drive->name, drq_type);
  55         else if (packet_size != 0)
  56                 printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 "
  57                         "bytes\n", s, drive->name, packet_size);
  58         else
  59                 return 1;
  60         return 0;
  61 }
  62 EXPORT_SYMBOL_GPL(ide_check_atapi_device);
  63
  64 /* PIO data transfer routine using the scatter gather table. */
  65 int ide_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
  66                     unsigned int bcount, int write)
  67 {
  68         ide_hwif_t *hwif = drive->hwif;
  69         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
  70         xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
  71         struct scatterlist *sg = pc->sg;
  72         char *buf;
  73         int count, done = 0;
  74
  75         while (bcount) {
  76                 count = min(sg->length - pc->b_count, bcount);
  77
  78                 if (PageHighMem(sg_page(sg))) {
  79                         unsigned long flags;
  80
  81                         local_irq_save(flags);
  82                         buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
  83                         xf(drive, NULL, buf + pc->b_count, count);
  84                         kunmap_atomic(buf - sg->offset, KM_IRQ0);
  85                         local_irq_restore(flags);
  86                 } else {
  87                         buf = sg_virt(sg);
  88                         xf(drive, NULL, buf + pc->b_count, count);
  89                 }
  90
  91                 bcount -= count;
  92                 pc->b_count += count;
  93                 done += count;
  94
  95                 if (pc->b_count == sg->length) {
  96                         if (!--pc->sg_cnt)
  97                                 break;
  98                         pc->sg = sg = sg_next(sg);
  99                         pc->b_count = 0;
 100                 }
 101         }
 102
 103         if (bcount) {
 104                 printk(KERN_ERR "%s: %d leftover bytes, %s\n", drive->name,
 105                         bcount, write ? "padding with zeros"
 106                                       : "discarding data");
 107                 ide_pad_transfer(drive, write, bcount);
 108         }
 109
 110         return done;
 111 }
 112 EXPORT_SYMBOL_GPL(ide_io_buffers);
 113
 114 void ide_init_pc(struct ide_atapi_pc *pc)
 115 {
 116         memset(pc, 0, sizeof(*pc));
 117         pc->buf = pc->pc_buf;
 118         pc->buf_size = IDE_PC_BUFFER_SIZE;
 119 }
 120 EXPORT_SYMBOL_GPL(ide_init_pc);
 121
 122 /* TODO: unify the code thus making some arguments go away */
 123 ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc,
 124         ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,
 125         void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),
 126         void (*retry_pc)(ide_drive_t *), void (*dsc_handle)(ide_drive_t *),
 127         int (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))
 128 {
 129         ide_hwif_t *hwif = drive->hwif;
 130         struct request *rq = hwif->hwgroup->rq;
 131         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 132         xfer_func_t *xferfunc;
 133         unsigned int temp;
 134         u16 bcount;
 135         u8 stat, ireason, scsi = drive->scsi;
 136
 137         debug_log("Enter %s - interrupt handler\n", __func__);
 138
 139         if (pc->flags & PC_FLAG_TIMEDOUT) {
 140                 drive->pc_callback(drive);
 141                 return ide_stopped;
 142         }
 143
 144         /* Clear the interrupt */
 145         stat = tp_ops->read_status(hwif);
 146
 147         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 148                 if (hwif->dma_ops->dma_end(drive) ||
 149                     (drive->media == ide_tape && !scsi && (stat & ATA_ERR))) {
 150                         if (drive->media == ide_floppy && !scsi)
 151                                 printk(KERN_ERR "%s: DMA %s error\n",
 152                                         drive->name, rq_data_dir(pc->rq)
 153                                                      ? "write" : "read");
 154                         pc->flags |= PC_FLAG_DMA_ERROR;
 155                 } else {
 156                         pc->xferred = pc->req_xfer;
 157                         if (update_buffers)
 158                                 update_buffers(drive, pc);
 159                 }
 160                 debug_log("%s: DMA finished\n", drive->name);
 161         }
 162
 163         /* No more interrupts */
 164         if ((stat & ATA_DRQ) == 0) {
 165                 debug_log("Packet command completed, %d bytes transferred\n",
 166                           pc->xferred);
 167
 168                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 169
 170                 local_irq_enable_in_hardirq();
 171
 172                 if (drive->media == ide_tape && !scsi &&
 173                     (stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
 174                         stat &= ~ATA_ERR;
 175
 176                 if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) {
 177                         /* Error detected */
 178                         debug_log("%s: I/O error\n", drive->name);
 179
 180                         if (drive->media != ide_tape || scsi) {
 181                                 pc->rq->errors++;
 182                                 if (scsi)
 183                                         goto cmd_finished;
 184                         }
 185
 186                         if (rq->cmd[0] == REQUEST_SENSE) {
 187                                 printk(KERN_ERR "%s: I/O error in request sense"
 188                                                 " command\n", drive->name);
 189                                 return ide_do_reset(drive);
 190                         }
 191
 192                         debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
 193
 194                         /* Retry operation */
 195                         retry_pc(drive);
 196
 197                         /* queued, but not started */
 198                         return ide_stopped;
 199                 }
 200 cmd_finished:
 201                 pc->error = 0;
 202                 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
 203                     (stat & ATA_DSC) == 0) {
 204                         dsc_handle(drive);
 205                         return ide_stopped;
 206                 }
 207
 208                 /* Command finished - Call the callback function */
 209                 drive->pc_callback(drive);
 210
 211                 return ide_stopped;
 212         }
 213
 214         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 215                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 216                 printk(KERN_ERR "%s: The device wants to issue more interrupts "
 217                                 "in DMA mode\n", drive->name);
 218                 ide_dma_off(drive);
 219                 return ide_do_reset(drive);
 220         }
 221
 222         /* Get the number of bytes to transfer on this interrupt. */
 223         ide_read_bcount_and_ireason(drive, &bcount, &ireason);
 224
 225         if (ireason & ATAPI_COD) {
 226                 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
 227                 return ide_do_reset(drive);
 228         }
 229
 230         if (((ireason & ATAPI_IO) == ATAPI_IO) ==
 231                 !!(pc->flags & PC_FLAG_WRITING)) {
 232                 /* Hopefully, we will never get here */
 233                 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
 234                                 "to %s!\n", drive->name,
 235                                 (ireason & ATAPI_IO) ? "Write" : "Read",
 236                                 (ireason & ATAPI_IO) ? "Read" : "Write");
 237                 return ide_do_reset(drive);
 238         }
 239
 240         if (!(pc->flags & PC_FLAG_WRITING)) {
 241                 /* Reading - Check that we have enough space */
 242                 temp = pc->xferred + bcount;
 243                 if (temp > pc->req_xfer) {
 244                         if (temp > pc->buf_size) {
 245                                 printk(KERN_ERR "%s: The device wants to send "
 246                                                 "us more data than expected - "
 247                                                 "discarding data\n",
 248                                                 drive->name);
 249                                 if (scsi)
 250                                         temp = pc->buf_size - pc->xferred;
 251                                 else
 252                                         temp = 0;
 253                                 if (temp) {
 254                                         if (pc->sg)
 255                                                 io_buffers(drive, pc, temp, 0);
 256                                         else
 257                                                 tp_ops->input_data(drive, NULL,
 258                                                         pc->cur_pos, temp);
 259                                         printk(KERN_ERR "%s: transferred %d of "
 260                                                         "%d bytes\n",
 261                                                         drive->name,
 262                                                         temp, bcount);
 263                                 }
 264                                 pc->xferred += temp;
 265                                 pc->cur_pos += temp;
 266                                 ide_pad_transfer(drive, 0, bcount - temp);
 267                                 ide_set_handler(drive, handler, timeout,
 268                                                 expiry);
 269                                 return ide_started;
 270                         }
 271                         debug_log("The device wants to send us more data than "
 272                                   "expected - allowing transfer\n");
 273                 }
 274                 xferfunc = tp_ops->input_data;
 275         } else
 276                 xferfunc = tp_ops->output_data;
 277
 278         if ((drive->media == ide_floppy && !scsi && !pc->buf) ||
 279             (drive->media == ide_tape && !scsi && pc->bh) ||
 280             (scsi && pc->sg)) {
 281                 int done = io_buffers(drive, pc, bcount,
 282                                   !!(pc->flags & PC_FLAG_WRITING));
 283
 284                 /* FIXME: don't do partial completions */
 285                 if (drive->media == ide_floppy && !scsi)
 286                         ide_end_request(drive, 1, done >> 9);
 287         } else
 288                 xferfunc(drive, NULL, pc->cur_pos, bcount);
 289
 290         /* Update the current position */
 291         pc->xferred += bcount;
 292         pc->cur_pos += bcount;
 293
 294         debug_log("[cmd %x] transferred %d bytes on that intr.\n",
 295                   rq->cmd[0], bcount);
 296
 297         /* And set the interrupt handler again */
 298         ide_set_handler(drive, handler, timeout, expiry);
 299         return ide_started;
 300 }
 301 EXPORT_SYMBOL_GPL(ide_pc_intr);
 302
 303 static u8 ide_read_ireason(ide_drive_t *drive)
 304 {
 305         ide_task_t task;
 306
 307         memset(&task, 0, sizeof(task));
 308         task.tf_flags = IDE_TFLAG_IN_NSECT;
 309
 310         drive->hwif->tp_ops->tf_read(drive, &task);
 311
 312         return task.tf.nsect & 3;
 313 }
 314
 315 static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
 316 {
 317         int retries = 100;
 318
 319         while (retries-- && ((ireason & ATAPI_COD) == 0 ||
 320                 (ireason & ATAPI_IO))) {
 321                 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
 322                                 "a packet command, retrying\n", drive->name);
 323                 udelay(100);
 324                 ireason = ide_read_ireason(drive);
 325                 if (retries == 0) {
 326                         printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
 327                                         "a packet command, ignoring\n",
 328                                         drive->name);
 329                         ireason |= ATAPI_COD;
 330                         ireason &= ~ATAPI_IO;
 331                 }
 332         }
 333
 334         return ireason;
 335 }
 336
 337 ide_startstop_t ide_transfer_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
 338                                 ide_handler_t *handler, unsigned int timeout,
 339                                 ide_expiry_t *expiry)
 340 {
 341         ide_hwif_t *hwif = drive->hwif;
 342         struct request *rq = hwif->hwgroup->rq;
 343         ide_startstop_t startstop;
 344         u8 ireason;
 345
 346         if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
 347                 printk(KERN_ERR "%s: Strange, packet command initiated yet "
 348                                 "DRQ isn't asserted\n", drive->name);
 349                 return startstop;
 350         }
 351
 352         ireason = ide_read_ireason(drive);
 353         if (drive->media == ide_tape && !drive->scsi)
 354                 ireason = ide_wait_ireason(drive, ireason);
 355
 356         if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) {
 357                 printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
 358                                 "a packet command\n", drive->name);
 359                 return ide_do_reset(drive);
 360         }
 361
 362         /* Set the interrupt routine */
 363         ide_set_handler(drive, handler, timeout, expiry);
 364
 365         /* Begin DMA, if necessary */
 366         if (pc->flags & PC_FLAG_DMA_OK) {
 367                 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
 368                 hwif->dma_ops->dma_start(drive);
 369         }
 370
 371         /* Send the actual packet */
 372         if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
 373                 hwif->tp_ops->output_data(drive, NULL, rq->cmd, 12);
 374
 375         return ide_started;
 376 }
 377 EXPORT_SYMBOL_GPL(ide_transfer_pc);
 378
 379 ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
 380                              ide_handler_t *handler, unsigned int timeout,
 381                              ide_expiry_t *expiry)
 382 {
 383         ide_hwif_t *hwif = drive->hwif;
 384         u16 bcount;
 385         u8 dma = 0;
 386
 387         /* We haven't transferred any data yet */
 388         pc->xferred = 0;
 389         pc->cur_pos = pc->buf;
 390
 391         /* Request to transfer the entire buffer at once */
 392         if (drive->media == ide_tape && !drive->scsi)
 393                 bcount = pc->req_xfer;
 394         else
 395                 bcount = min(pc->req_xfer, 63 * 1024);
 396
 397         if (pc->flags & PC_FLAG_DMA_ERROR) {
 398                 pc->flags &= ~PC_FLAG_DMA_ERROR;
 399                 ide_dma_off(drive);
 400         }
 401
 402         if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) {
 403                 if (drive->scsi)
 404                         hwif->sg_mapped = 1;
 405                 dma = !hwif->dma_ops->dma_setup(drive);
 406                 if (drive->scsi)
 407                         hwif->sg_mapped = 0;
 408         }
 409
 410         if (!dma)
 411                 pc->flags &= ~PC_FLAG_DMA_OK;
 412
 413         ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
 414                            bcount, dma);
 415
 416         /* Issue the packet command */
 417         if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
 418                 ide_execute_command(drive, ATA_CMD_PACKET, handler,
 419                                     timeout, NULL);
 420                 return ide_started;
 421         } else {
 422                 ide_execute_pkt_cmd(drive);
 423                 return (*handler)(drive);
 424         }
 425 }
 426 EXPORT_SYMBOL_GPL(ide_issue_pc);