err.no Git - 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 /* 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         xfer_func_t *xferfunc;
  26         unsigned int temp;
  27         u16 bcount;
  28         u8 stat, ireason, scsi = drive->scsi;
  29
  30         debug_log("Enter %s - interrupt handler\n", __func__);
  31
  32         if (pc->flags & PC_FLAG_TIMEDOUT) {
  33                 pc->callback(drive);
  34                 return ide_stopped;
  35         }
  36
  37         /* Clear the interrupt */
  38         stat = hwif->read_status(hwif);
  39
  40         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
  41                 if (hwif->dma_ops->dma_end(drive) ||
  42                     (drive->media == ide_tape && !scsi && (stat & ERR_STAT))) {
  43                         if (drive->media == ide_floppy && !scsi)
  44                                 printk(KERN_ERR "%s: DMA %s error\n",
  45                                         drive->name, rq_data_dir(pc->rq)
  46                                                      ? "write" : "read");
  47                         pc->flags |= PC_FLAG_DMA_ERROR;
  48                 } else {
  49                         pc->xferred = pc->req_xfer;
  50                         if (update_buffers)
  51                                 update_buffers(drive, pc);
  52                 }
  53                 debug_log("%s: DMA finished\n", drive->name);
  54         }
  55
  56         /* No more interrupts */
  57         if ((stat & DRQ_STAT) == 0) {
  58                 debug_log("Packet command completed, %d bytes transferred\n",
  59                           pc->xferred);
  60
  61                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
  62
  63                 local_irq_enable_in_hardirq();
  64
  65                 if (drive->media == ide_tape && !scsi &&
  66                     (stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE)
  67                         stat &= ~ERR_STAT;
  68                 if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) {
  69                         /* Error detected */
  70                         debug_log("%s: I/O error\n", drive->name);
  71
  72                         if (drive->media != ide_tape || scsi) {
  73                                 pc->rq->errors++;
  74                                 if (scsi)
  75                                         goto cmd_finished;
  76                         }
  77
  78                         if (pc->c[0] == REQUEST_SENSE) {
  79                                 printk(KERN_ERR "%s: I/O error in request sense"
  80                                                 " command\n", drive->name);
  81                                 return ide_do_reset(drive);
  82                         }
  83
  84                         debug_log("[cmd %x]: check condition\n", pc->c[0]);
  85
  86                         /* Retry operation */
  87                         retry_pc(drive);
  88                         /* queued, but not started */
  89                         return ide_stopped;
  90                 }
  91 cmd_finished:
  92                 pc->error = 0;
  93                 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
  94                     (stat & SEEK_STAT) == 0) {
  95                         dsc_handle(drive);
  96                         return ide_stopped;
  97                 }
  98                 /* Command finished - Call the callback function */
  99                 pc->callback(drive);
 100                 return ide_stopped;
 101         }
 102
 103         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 104                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 105                 printk(KERN_ERR "%s: The device wants to issue more interrupts "
 106                                 "in DMA mode\n", drive->name);
 107                 ide_dma_off(drive);
 108                 return ide_do_reset(drive);
 109         }
 110         /* Get the number of bytes to transfer on this interrupt. */
 111         bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
 112                   hwif->INB(hwif->io_ports.lbam_addr);
 113
 114         ireason = hwif->INB(hwif->io_ports.nsect_addr);
 115
 116         if (ireason & CD) {
 117                 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
 118                 return ide_do_reset(drive);
 119         }
 120         if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
 121                 /* Hopefully, we will never get here */
 122                 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
 123                                 "to %s!\n", drive->name,
 124                                 (ireason & IO) ? "Write" : "Read",
 125                                 (ireason & IO) ? "Read" : "Write");
 126                 return ide_do_reset(drive);
 127         }
 128         if (!(pc->flags & PC_FLAG_WRITING)) {
 129                 /* Reading - Check that we have enough space */
 130                 temp = pc->xferred + bcount;
 131                 if (temp > pc->req_xfer) {
 132                         if (temp > pc->buf_size) {
 133                                 printk(KERN_ERR "%s: The device wants to send "
 134                                                 "us more data than expected - "
 135                                                 "discarding data\n",
 136                                                 drive->name);
 137                                 if (scsi)
 138                                         temp = pc->buf_size - pc->xferred;
 139                                 else
 140                                         temp = 0;
 141                                 if (temp) {
 142                                         if (pc->sg)
 143                                                 io_buffers(drive, pc, temp, 0);
 144                                         else
 145                                                 hwif->input_data(drive, NULL,
 146                                                         pc->cur_pos, temp);
 147                                         printk(KERN_ERR "%s: transferred %d of "
 148                                                         "%d bytes\n",
 149                                                         drive->name,
 150                                                         temp, bcount);
 151                                 }
 152                                 pc->xferred += temp;
 153                                 pc->cur_pos += temp;
 154                                 ide_pad_transfer(drive, 0, bcount - temp);
 155                                 ide_set_handler(drive, handler, timeout,
 156                                                 expiry);
 157                                 return ide_started;
 158                         }
 159                         debug_log("The device wants to send us more data than "
 160                                   "expected - allowing transfer\n");
 161                 }
 162                 xferfunc = hwif->input_data;
 163         } else
 164                 xferfunc = hwif->output_data;
 165
 166         if ((drive->media == ide_floppy && !scsi && !pc->buf) ||
 167             (drive->media == ide_tape && !scsi && pc->bh) ||
 168             (scsi && pc->sg))
 169                 io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING));
 170         else
 171                 xferfunc(drive, NULL, pc->cur_pos, bcount);
 172
 173         /* Update the current position */
 174         pc->xferred += bcount;
 175         pc->cur_pos += bcount;
 176
 177         debug_log("[cmd %x] transferred %d bytes on that intr.\n",
 178                   pc->c[0], bcount);
 179
 180         /* And set the interrupt handler again */
 181         ide_set_handler(drive, handler, timeout, expiry);
 182         return ide_started;
 183 }
 184 EXPORT_SYMBOL_GPL(ide_pc_intr);
 185
 186 static u8 ide_read_ireason(ide_drive_t *drive)
 187 {
 188         ide_task_t task;
 189
 190         memset(&task, 0, sizeof(task));
 191         task.tf_flags = IDE_TFLAG_IN_NSECT;
 192
 193         drive->hwif->tf_read(drive, &task);
 194
 195         return task.tf.nsect & 3;
 196 }
 197
 198 static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
 199 {
 200         int retries = 100;
 201
 202         while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
 203                 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
 204                                 "a packet command, retrying\n", drive->name);
 205                 udelay(100);
 206                 ireason = ide_read_ireason(drive);
 207                 if (retries == 0) {
 208                         printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
 209                                         "a packet command, ignoring\n",
 210                                         drive->name);
 211                         ireason |= CD;
 212                         ireason &= ~IO;
 213                 }
 214         }
 215
 216         return ireason;
 217 }
 218
 219 ide_startstop_t ide_transfer_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
 220                                 ide_handler_t *handler, unsigned int timeout,
 221                                 ide_expiry_t *expiry)
 222 {
 223         ide_hwif_t *hwif = drive->hwif;
 224         ide_startstop_t startstop;
 225         u8 ireason;
 226
 227         if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
 228                 printk(KERN_ERR "%s: Strange, packet command initiated yet "
 229                                 "DRQ isn't asserted\n", drive->name);
 230                 return startstop;
 231         }
 232
 233         ireason = ide_read_ireason(drive);
 234         if (drive->media == ide_tape && !drive->scsi)
 235                 ireason = ide_wait_ireason(drive, ireason);
 236
 237         if ((ireason & CD) == 0 || (ireason & IO)) {
 238                 printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
 239                                 "a packet command\n", drive->name);
 240                 return ide_do_reset(drive);
 241         }
 242
 243         /* Set the interrupt routine */
 244         ide_set_handler(drive, handler, timeout, expiry);
 245
 246         /* Begin DMA, if necessary */
 247         if (pc->flags & PC_FLAG_DMA_OK) {
 248                 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
 249                 hwif->dma_ops->dma_start(drive);
 250         }
 251
 252         /* Send the actual packet */
 253         if ((pc->flags & PC_FLAG_ZIP_DRIVE) == 0)
 254                 hwif->output_data(drive, NULL, pc->c, 12);
 255
 256         return ide_started;
 257 }
 258 EXPORT_SYMBOL_GPL(ide_transfer_pc);
 259
 260 ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
 261                              ide_handler_t *handler, unsigned int timeout,
 262                              ide_expiry_t *expiry)
 263 {
 264         ide_hwif_t *hwif = drive->hwif;
 265         u16 bcount;
 266         u8 dma = 0;
 267
 268         /* We haven't transferred any data yet */
 269         pc->xferred = 0;
 270         pc->cur_pos = pc->buf;
 271
 272         /* Request to transfer the entire buffer at once */
 273         if (drive->media == ide_tape && !drive->scsi)
 274                 bcount = pc->req_xfer;
 275         else
 276                 bcount = min(pc->req_xfer, 63 * 1024);
 277
 278         if (pc->flags & PC_FLAG_DMA_ERROR) {
 279                 pc->flags &= ~PC_FLAG_DMA_ERROR;
 280                 ide_dma_off(drive);
 281         }
 282
 283         if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) {
 284                 if (drive->scsi)
 285                         hwif->sg_mapped = 1;
 286                 dma = !hwif->dma_ops->dma_setup(drive);
 287                 if (drive->scsi)
 288                         hwif->sg_mapped = 0;
 289         }
 290
 291         if (!dma)
 292                 pc->flags &= ~PC_FLAG_DMA_OK;
 293
 294         ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
 295                            bcount, dma);
 296
 297         /* Issue the packet command */
 298         if (pc->flags & PC_FLAG_DRQ_INTERRUPT) {
 299                 ide_execute_command(drive, WIN_PACKETCMD, handler,
 300                                     timeout, NULL);
 301                 return ide_started;
 302         } else {
 303                 ide_execute_pkt_cmd(drive);
 304                 return (*handler)(drive);
 305         }
 306 }
 307 EXPORT_SYMBOL_GPL(ide_issue_pc);