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