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 /* TODO: unify the code thus making some arguments go away */
  18 ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc,
  19         ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,
  20         void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),
  21         void (*retry_pc)(ide_drive_t *), void (*dsc_handle)(ide_drive_t *),
  22         void (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))
  23 {
  24         ide_hwif_t *hwif = drive->hwif;
  25         struct request *rq = hwif->hwgroup->rq;
  26         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
  27         xfer_func_t *xferfunc;
  28         unsigned int temp;
  29         u16 bcount;
  30         u8 stat, ireason, scsi = drive->scsi;
  31
  32         debug_log("Enter %s - interrupt handler\n", __func__);
  33
  34         if (pc->flags & PC_FLAG_TIMEDOUT) {
  35                 drive->pc_callback(drive);
  36                 return ide_stopped;
  37         }
  38
  39         /* Clear the interrupt */
  40         stat = tp_ops->read_status(hwif);
  41
  42         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
  43                 if (hwif->dma_ops->dma_end(drive) ||
  44                     (drive->media == ide_tape && !scsi && (stat & ATA_ERR))) {
  45                         if (drive->media == ide_floppy && !scsi)
  46                                 printk(KERN_ERR "%s: DMA %s error\n",
  47                                         drive->name, rq_data_dir(pc->rq)
  48                                                      ? "write" : "read");
  49                         pc->flags |= PC_FLAG_DMA_ERROR;
  50                 } else {
  51                         pc->xferred = pc->req_xfer;
  52                         if (update_buffers)
  53                                 update_buffers(drive, pc);
  54                 }
  55                 debug_log("%s: DMA finished\n", drive->name);
  56         }
  57
  58         /* No more interrupts */
  59         if ((stat & ATA_DRQ) == 0) {
  60                 debug_log("Packet command completed, %d bytes transferred\n",
  61                           pc->xferred);
  62
  63                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
  64
  65                 local_irq_enable_in_hardirq();
  66
  67                 if (drive->media == ide_tape && !scsi &&
  68                     (stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
  69                         stat &= ~ATA_ERR;
  70
  71                 if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) {
  72                         /* Error detected */
  73                         debug_log("%s: I/O error\n", drive->name);
  74
  75                         if (drive->media != ide_tape || scsi) {
  76                                 pc->rq->errors++;
  77                                 if (scsi)
  78                                         goto cmd_finished;
  79                         }
  80
  81                         if (rq->cmd[0] == REQUEST_SENSE) {
  82                                 printk(KERN_ERR "%s: I/O error in request sense"
  83                                                 " command\n", drive->name);
  84                                 return ide_do_reset(drive);
  85                         }
  86
  87                         debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
  88
  89                         /* Retry operation */
  90                         retry_pc(drive);
  91
  92                         /* queued, but not started */
  93                         return ide_stopped;
  94                 }
  95 cmd_finished:
  96                 pc->error = 0;
  97                 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
  98                     (stat & ATA_DSC) == 0) {
  99                         dsc_handle(drive);
 100                         return ide_stopped;
 101                 }
 102
 103                 /* Command finished - Call the callback function */
 104                 drive->pc_callback(drive);
 105
 106                 return ide_stopped;
 107         }
 108
 109         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 110                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 111                 printk(KERN_ERR "%s: The device wants to issue more interrupts "
 112                                 "in DMA mode\n", drive->name);
 113                 ide_dma_off(drive);
 114                 return ide_do_reset(drive);
 115         }
 116
 117         /* Get the number of bytes to transfer on this interrupt. */
 118         ide_read_bcount_and_ireason(drive, &bcount, &ireason);
 119
 120         if (ireason & ATAPI_COD) {
 121                 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
 122                 return ide_do_reset(drive);
 123         }
 124
 125         if (((ireason & ATAPI_IO) == ATAPI_IO) ==
 126                 !!(pc->flags & PC_FLAG_WRITING)) {
 127                 /* Hopefully, we will never get here */
 128                 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
 129                                 "to %s!\n", drive->name,
 130                                 (ireason & ATAPI_IO) ? "Write" : "Read",
 131                                 (ireason & ATAPI_IO) ? "Read" : "Write");
 132                 return ide_do_reset(drive);
 133         }
 134
 135         if (!(pc->flags & PC_FLAG_WRITING)) {
 136                 /* Reading - Check that we have enough space */
 137                 temp = pc->xferred + bcount;
 138                 if (temp > pc->req_xfer) {
 139                         if (temp > pc->buf_size) {
 140                                 printk(KERN_ERR "%s: The device wants to send "
 141                                                 "us more data than expected - "
 142                                                 "discarding data\n",
 143                                                 drive->name);
 144                                 if (scsi)
 145                                         temp = pc->buf_size - pc->xferred;
 146                                 else
 147                                         temp = 0;
 148                                 if (temp) {
 149                                         if (pc->sg)
 150                                                 io_buffers(drive, pc, temp, 0);
 151                                         else
 152                                                 tp_ops->input_data(drive, NULL,
 153                                                         pc->cur_pos, temp);
 154                                         printk(KERN_ERR "%s: transferred %d of "
 155                                                         "%d bytes\n",
 156                                                         drive->name,
 157                                                         temp, bcount);
 158                                 }
 159                                 pc->xferred += temp;
 160                                 pc->cur_pos += temp;
 161                                 ide_pad_transfer(drive, 0, bcount - temp);
 162                                 ide_set_handler(drive, handler, timeout,
 163                                                 expiry);
 164                                 return ide_started;
 165                         }
 166                         debug_log("The device wants to send us more data than "
 167                                   "expected - allowing transfer\n");
 168                 }
 169                 xferfunc = tp_ops->input_data;
 170         } else
 171                 xferfunc = tp_ops->output_data;
 172
 173         if ((drive->media == ide_floppy && !scsi && !pc->buf) ||
 174             (drive->media == ide_tape && !scsi && pc->bh) ||
 175             (scsi && pc->sg))
 176                 io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING));
 177         else
 178                 xferfunc(drive, NULL, pc->cur_pos, bcount);
 179
 180         /* Update the current position */
 181         pc->xferred += bcount;
 182         pc->cur_pos += bcount;
 183
 184         debug_log("[cmd %x] transferred %d bytes on that intr.\n",
 185                   rq->cmd[0], bcount);
 186
 187         /* And set the interrupt handler again */
 188         ide_set_handler(drive, handler, timeout, expiry);
 189         return ide_started;
 190 }
 191 EXPORT_SYMBOL_GPL(ide_pc_intr);
 192
 193 static u8 ide_read_ireason(ide_drive_t *drive)
 194 {
 195         ide_task_t task;
 196
 197         memset(&task, 0, sizeof(task));
 198         task.tf_flags = IDE_TFLAG_IN_NSECT;
 199
 200         drive->hwif->tp_ops->tf_read(drive, &task);
 201
 202         return task.tf.nsect & 3;
 203 }
 204
 205 static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
 206 {
 207         int retries = 100;
 208
 209         while (retries-- && ((ireason & ATAPI_COD) == 0 ||
 210                 (ireason & ATAPI_IO))) {
 211                 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
 212                                 "a packet command, retrying\n", drive->name);
 213                 udelay(100);
 214                 ireason = ide_read_ireason(drive);
 215                 if (retries == 0) {
 216                         printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
 217                                         "a packet command, ignoring\n",
 218                                         drive->name);
 219                         ireason |= ATAPI_COD;
 220                         ireason &= ~ATAPI_IO;
 221                 }
 222         }
 223
 224         return ireason;
 225 }
 226
 227 ide_startstop_t ide_transfer_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
 228                                 ide_handler_t *handler, unsigned int timeout,
 229                                 ide_expiry_t *expiry)
 230 {
 231         ide_hwif_t *hwif = drive->hwif;
 232         struct request *rq = hwif->hwgroup->rq;
 233         ide_startstop_t startstop;
 234         u8 ireason;
 235
 236         if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
 237                 printk(KERN_ERR "%s: Strange, packet command initiated yet "
 238                                 "DRQ isn't asserted\n", drive->name);
 239                 return startstop;
 240         }
 241
 242         ireason = ide_read_ireason(drive);
 243         if (drive->media == ide_tape && !drive->scsi)
 244                 ireason = ide_wait_ireason(drive, ireason);
 245
 246         if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) {
 247                 printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
 248                                 "a packet command\n", drive->name);
 249                 return ide_do_reset(drive);
 250         }
 251
 252         /* Set the interrupt routine */
 253         ide_set_handler(drive, handler, timeout, expiry);
 254
 255         /* Begin DMA, if necessary */
 256         if (pc->flags & PC_FLAG_DMA_OK) {
 257                 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
 258                 hwif->dma_ops->dma_start(drive);
 259         }
 260
 261         /* Send the actual packet */
 262         if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
 263                 hwif->tp_ops->output_data(drive, NULL, rq->cmd, 12);
 264
 265         return ide_started;
 266 }
 267 EXPORT_SYMBOL_GPL(ide_transfer_pc);
 268
 269 ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
 270                              ide_handler_t *handler, unsigned int timeout,
 271                              ide_expiry_t *expiry)
 272 {
 273         ide_hwif_t *hwif = drive->hwif;
 274         u16 bcount;
 275         u8 dma = 0;
 276
 277         /* We haven't transferred any data yet */
 278         pc->xferred = 0;
 279         pc->cur_pos = pc->buf;
 280
 281         /* Request to transfer the entire buffer at once */
 282         if (drive->media == ide_tape && !drive->scsi)
 283                 bcount = pc->req_xfer;
 284         else
 285                 bcount = min(pc->req_xfer, 63 * 1024);
 286
 287         if (pc->flags & PC_FLAG_DMA_ERROR) {
 288                 pc->flags &= ~PC_FLAG_DMA_ERROR;
 289                 ide_dma_off(drive);
 290         }
 291
 292         if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) {
 293                 if (drive->scsi)
 294                         hwif->sg_mapped = 1;
 295                 dma = !hwif->dma_ops->dma_setup(drive);
 296                 if (drive->scsi)
 297                         hwif->sg_mapped = 0;
 298         }
 299
 300         if (!dma)
 301                 pc->flags &= ~PC_FLAG_DMA_OK;
 302
 303         ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
 304                            bcount, dma);
 305
 306         /* Issue the packet command */
 307         if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
 308                 ide_execute_command(drive, ATA_CMD_PACKET, handler,
 309                                     timeout, NULL);
 310                 return ide_started;
 311         } else {
 312                 ide_execute_pkt_cmd(drive);
 313                 return (*handler)(drive);
 314         }
 315 }
 316 EXPORT_SYMBOL_GPL(ide_issue_pc);