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