drivers/ide/ide-taskfile.c

   1 /*
   2  *  Copyright (C) 2000-2002        Michael Cornwell <cornwell@acm.org>
   3  *  Copyright (C) 2000-2002        Andre Hedrick <andre@linux-ide.org>
   4  *  Copyright (C) 2001-2002        Klaus Smolin
   5  *                                      IBM Storage Technology Division
   6  *  Copyright (C) 2003-2004, 2007  Bartlomiej Zolnierkiewicz
   7  *
   8  *  The big the bad and the ugly.
   9  */
  10
  11 #include <linux/types.h>
  12 #include <linux/string.h>
  13 #include <linux/kernel.h>
  14 #include <linux/export.h>
  15 #include <linux/sched.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/errno.h>
  18 #include <linux/slab.h>
  19 #include <linux/delay.h>
  20 #include <linux/hdreg.h>
  21 #include <linux/ide.h>
  22 #include <linux/nmi.h>
  23 #include <linux/scatterlist.h>
  24 #include <linux/uaccess.h>
  25
  26 #include <asm/io.h>
  27
  28 void ide_tf_readback(ide_drive_t *drive, struct ide_cmd *cmd)
  29 {
  30         ide_hwif_t *hwif = drive->hwif;
  31         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
  32
  33         /* Be sure we're looking at the low order bytes */
  34         tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
  35
  36         tp_ops->tf_read(drive, &cmd->tf, cmd->valid.in.tf);
  37
  38         if (cmd->tf_flags & IDE_TFLAG_LBA48) {
  39                 tp_ops->write_devctl(hwif, ATA_HOB | ATA_DEVCTL_OBS);
  40
  41                 tp_ops->tf_read(drive, &cmd->hob, cmd->valid.in.hob);
  42         }
  43 }
  44
  45 void ide_tf_dump(const char *s, struct ide_cmd *cmd)
  46 {
  47 #ifdef DEBUG
  48         printk("%s: tf: feat 0x%02x nsect 0x%02x lbal 0x%02x "
  49                 "lbam 0x%02x lbah 0x%02x dev 0x%02x cmd 0x%02x\n",
  50                s, cmd->tf.feature, cmd->tf.nsect,
  51                cmd->tf.lbal, cmd->tf.lbam, cmd->tf.lbah,
  52                cmd->tf.device, cmd->tf.command);
  53         printk("%s: hob: nsect 0x%02x lbal 0x%02x lbam 0x%02x lbah 0x%02x\n",
  54                s, cmd->hob.nsect, cmd->hob.lbal, cmd->hob.lbam, cmd->hob.lbah);
  55 #endif
  56 }
  57
  58 int taskfile_lib_get_identify(ide_drive_t *drive, u8 *buf)
  59 {
  60         struct ide_cmd cmd;
  61
  62         memset(&cmd, 0, sizeof(cmd));
  63         cmd.tf.nsect = 0x01;
  64         if (drive->media == ide_disk)
  65                 cmd.tf.command = ATA_CMD_ID_ATA;
  66         else
  67                 cmd.tf.command = ATA_CMD_ID_ATAPI;
  68         cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
  69         cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
  70         cmd.protocol = ATA_PROT_PIO;
  71
  72         return ide_raw_taskfile(drive, &cmd, buf, 1);
  73 }
  74
  75 static ide_startstop_t task_no_data_intr(ide_drive_t *);
  76 static ide_startstop_t pre_task_out_intr(ide_drive_t *, struct ide_cmd *);
  77 static ide_startstop_t task_pio_intr(ide_drive_t *);
  78
  79 ide_startstop_t do_rw_taskfile(ide_drive_t *drive, struct ide_cmd *orig_cmd)
  80 {
  81         ide_hwif_t *hwif = drive->hwif;
  82         struct ide_cmd *cmd = &hwif->cmd;
  83         struct ide_taskfile *tf = &cmd->tf;
  84         ide_handler_t *handler = NULL;
  85         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
  86         const struct ide_dma_ops *dma_ops = hwif->dma_ops;
  87
  88         if (orig_cmd->protocol == ATA_PROT_PIO &&
  89             (orig_cmd->tf_flags & IDE_TFLAG_MULTI_PIO) &&
  90             drive->mult_count == 0) {
  91                 pr_err("%s: multimode not set!\n", drive->name);
  92                 return ide_stopped;
  93         }
  94
  95         if (orig_cmd->ftf_flags & IDE_FTFLAG_FLAGGED)
  96                 orig_cmd->ftf_flags |= IDE_FTFLAG_SET_IN_FLAGS;
  97
  98         memcpy(cmd, orig_cmd, sizeof(*cmd));
  99
 100         if ((cmd->tf_flags & IDE_TFLAG_DMA_PIO_FALLBACK) == 0) {
 101                 ide_tf_dump(drive->name, cmd);
 102                 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
 103
 104                 if (cmd->ftf_flags & IDE_FTFLAG_OUT_DATA) {
 105                         u8 data[2] = { cmd->tf.data, cmd->hob.data };
 106
 107                         tp_ops->output_data(drive, cmd, data, 2);
 108                 }
 109
 110                 if (cmd->valid.out.tf & IDE_VALID_DEVICE) {
 111                         u8 HIHI = (cmd->tf_flags & IDE_TFLAG_LBA48) ?
 112                                   0xE0 : 0xEF;
 113
 114                         if (!(cmd->ftf_flags & IDE_FTFLAG_FLAGGED))
 115                                 cmd->tf.device &= HIHI;
 116                         cmd->tf.device |= drive->select;
 117                 }
 118
 119                 tp_ops->tf_load(drive, &cmd->hob, cmd->valid.out.hob);
 120                 tp_ops->tf_load(drive, &cmd->tf,  cmd->valid.out.tf);
 121         }
 122
 123         switch (cmd->protocol) {
 124         case ATA_PROT_PIO:
 125                 if (cmd->tf_flags & IDE_TFLAG_WRITE) {
 126                         tp_ops->exec_command(hwif, tf->command);
 127                         ndelay(400);    /* FIXME */
 128                         return pre_task_out_intr(drive, cmd);
 129                 }
 130                 handler = task_pio_intr;
 131                 /* fall-through */
 132         case ATA_PROT_NODATA:
 133                 if (handler == NULL)
 134                         handler = task_no_data_intr;
 135                 ide_execute_command(drive, cmd, handler, WAIT_WORSTCASE);
 136                 return ide_started;
 137         case ATA_PROT_DMA:
 138                 if (ide_dma_prepare(drive, cmd))
 139                         return ide_stopped;
 140                 hwif->expiry = dma_ops->dma_timer_expiry;
 141                 ide_execute_command(drive, cmd, ide_dma_intr, 2 * WAIT_CMD);
 142                 dma_ops->dma_start(drive);
 143         default:
 144                 return ide_started;
 145         }
 146 }
 147 EXPORT_SYMBOL_GPL(do_rw_taskfile);
 148
 149 static ide_startstop_t task_no_data_intr(ide_drive_t *drive)
 150 {
 151         ide_hwif_t *hwif = drive->hwif;
 152         struct ide_cmd *cmd = &hwif->cmd;
 153         struct ide_taskfile *tf = &cmd->tf;
 154         int custom = (cmd->tf_flags & IDE_TFLAG_CUSTOM_HANDLER) ? 1 : 0;
 155         int retries = (custom && tf->command == ATA_CMD_INIT_DEV_PARAMS) ? 5 : 1;
 156         u8 stat;
 157
 158         local_irq_enable_in_hardirq();
 159
 160         while (1) {
 161                 stat = hwif->tp_ops->read_status(hwif);
 162                 if ((stat & ATA_BUSY) == 0 || retries-- == 0)
 163                         break;
 164                 udelay(10);
 165         };
 166
 167         if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) {
 168                 if (custom && tf->command == ATA_CMD_SET_MULTI) {
 169                         drive->mult_req = drive->mult_count = 0;
 170                         drive->special_flags |= IDE_SFLAG_RECALIBRATE;
 171                         (void)ide_dump_status(drive, __func__, stat);
 172                         return ide_stopped;
 173                 } else if (custom && tf->command == ATA_CMD_INIT_DEV_PARAMS) {
 174                         if ((stat & (ATA_ERR | ATA_DRQ)) == 0) {
 175                                 ide_set_handler(drive, &task_no_data_intr,
 176                                                 WAIT_WORSTCASE);
 177                                 return ide_started;
 178                         }
 179                 }
 180                 return ide_error(drive, "task_no_data_intr", stat);
 181         }
 182
 183         if (custom && tf->command == ATA_CMD_SET_MULTI)
 184                 drive->mult_count = drive->mult_req;
 185
 186         if (custom == 0 || tf->command == ATA_CMD_IDLEIMMEDIATE ||
 187             tf->command == ATA_CMD_CHK_POWER) {
 188                 struct request *rq = hwif->rq;
 189
 190                 if (ata_pm_request(rq))
 191                         ide_complete_pm_rq(drive, rq);
 192                 else
 193                         ide_finish_cmd(drive, cmd, stat);
 194         }
 195
 196         return ide_stopped;
 197 }
 198
 199 static u8 wait_drive_not_busy(ide_drive_t *drive)
 200 {
 201         ide_hwif_t *hwif = drive->hwif;
 202         int retries;
 203         u8 stat;
 204
 205         /*
 206          * Last sector was transferred, wait until device is ready.  This can
 207          * take up to 6 ms on some ATAPI devices, so we will wait max 10 ms.
 208          */
 209         for (retries = 0; retries < 1000; retries++) {
 210                 stat = hwif->tp_ops->read_status(hwif);
 211
 212                 if (stat & ATA_BUSY)
 213                         udelay(10);
 214                 else
 215                         break;
 216         }
 217
 218         if (stat & ATA_BUSY)
 219                 pr_err("%s: drive still BUSY!\n", drive->name);
 220
 221         return stat;
 222 }
 223
 224 void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
 225                    unsigned int write, unsigned int len)
 226 {
 227         ide_hwif_t *hwif = drive->hwif;
 228         struct scatterlist *sg = hwif->sg_table;
 229         struct scatterlist *cursg = cmd->cursg;
 230         unsigned long uninitialized_var(flags);
 231         struct page *page;
 232         unsigned int offset;
 233         u8 *buf;
 234
 235         cursg = cmd->cursg;
 236         if (cursg == NULL)
 237                 cursg = cmd->cursg = sg;
 238
 239         while (len) {
 240                 unsigned nr_bytes = min(len, cursg->length - cmd->cursg_ofs);
 241                 int page_is_high;
 242
 243                 page = sg_page(cursg);
 244                 offset = cursg->offset + cmd->cursg_ofs;
 245
 246                 /* get the current page and offset */
 247                 page = nth_page(page, (offset >> PAGE_SHIFT));
 248                 offset %= PAGE_SIZE;
 249
 250                 nr_bytes = min_t(unsigned, nr_bytes, (PAGE_SIZE - offset));
 251
 252                 page_is_high = PageHighMem(page);
 253                 if (page_is_high)
 254                         local_irq_save(flags);
 255
 256                 buf = kmap_atomic(page) + offset;
 257
 258                 cmd->nleft -= nr_bytes;
 259                 cmd->cursg_ofs += nr_bytes;
 260
 261                 if (cmd->cursg_ofs == cursg->length) {
 262                         cursg = cmd->cursg = sg_next(cmd->cursg);
 263                         cmd->cursg_ofs = 0;
 264                 }
 265
 266                 /* do the actual data transfer */
 267                 if (write)
 268                         hwif->tp_ops->output_data(drive, cmd, buf, nr_bytes);
 269                 else
 270                         hwif->tp_ops->input_data(drive, cmd, buf, nr_bytes);
 271
 272                 kunmap_atomic(buf);
 273
 274                 if (page_is_high)
 275                         local_irq_restore(flags);
 276
 277                 len -= nr_bytes;
 278         }
 279 }
 280 EXPORT_SYMBOL_GPL(ide_pio_bytes);
 281
 282 static void ide_pio_datablock(ide_drive_t *drive, struct ide_cmd *cmd,
 283                               unsigned int write)
 284 {
 285         unsigned int nr_bytes;
 286
 287         u8 saved_io_32bit = drive->io_32bit;
 288
 289         if (cmd->tf_flags & IDE_TFLAG_FS)
 290                 scsi_req(cmd->rq)->result = 0;
 291
 292         if (cmd->tf_flags & IDE_TFLAG_IO_16BIT)
 293                 drive->io_32bit = 0;
 294
 295         touch_softlockup_watchdog();
 296
 297         if (cmd->tf_flags & IDE_TFLAG_MULTI_PIO)
 298                 nr_bytes = min_t(unsigned, cmd->nleft, drive->mult_count << 9);
 299         else
 300                 nr_bytes = SECTOR_SIZE;
 301
 302         ide_pio_bytes(drive, cmd, write, nr_bytes);
 303
 304         drive->io_32bit = saved_io_32bit;
 305 }
 306
 307 static void ide_error_cmd(ide_drive_t *drive, struct ide_cmd *cmd)
 308 {
 309         if (cmd->tf_flags & IDE_TFLAG_FS) {
 310                 int nr_bytes = cmd->nbytes - cmd->nleft;
 311
 312                 if (cmd->protocol == ATA_PROT_PIO &&
 313                     ((cmd->tf_flags & IDE_TFLAG_WRITE) || cmd->nleft == 0)) {
 314                         if (cmd->tf_flags & IDE_TFLAG_MULTI_PIO)
 315                                 nr_bytes -= drive->mult_count << 9;
 316                         else
 317                                 nr_bytes -= SECTOR_SIZE;
 318                 }
 319
 320                 if (nr_bytes > 0)
 321                         ide_complete_rq(drive, BLK_STS_OK, nr_bytes);
 322         }
 323 }
 324
 325 void ide_finish_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat)
 326 {
 327         struct request *rq = drive->hwif->rq;
 328         u8 err = ide_read_error(drive), nsect = cmd->tf.nsect;
 329         u8 set_xfer = !!(cmd->tf_flags & IDE_TFLAG_SET_XFER);
 330
 331         ide_complete_cmd(drive, cmd, stat, err);
 332         scsi_req(rq)->result = err;
 333
 334         if (err == 0 && set_xfer) {
 335                 ide_set_xfer_rate(drive, nsect);
 336                 ide_driveid_update(drive);
 337         }
 338
 339         ide_complete_rq(drive, err ? BLK_STS_IOERR : BLK_STS_OK, blk_rq_bytes(rq));
 340 }
 341
 342 /*
 343  * Handler for command with PIO data phase.
 344  */
 345 static ide_startstop_t task_pio_intr(ide_drive_t *drive)
 346 {
 347         ide_hwif_t *hwif = drive->hwif;
 348         struct ide_cmd *cmd = &drive->hwif->cmd;
 349         u8 stat = hwif->tp_ops->read_status(hwif);
 350         u8 write = !!(cmd->tf_flags & IDE_TFLAG_WRITE);
 351
 352         if (write == 0) {
 353                 /* Error? */
 354                 if (stat & ATA_ERR)
 355                         goto out_err;
 356
 357                 /* Didn't want any data? Odd. */
 358                 if ((stat & ATA_DRQ) == 0) {
 359                         /* Command all done? */
 360                         if (OK_STAT(stat, ATA_DRDY, ATA_BUSY))
 361                                 goto out_end;
 362
 363                         /* Assume it was a spurious irq */
 364                         goto out_wait;
 365                 }
 366         } else {
 367                 if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat))
 368                         goto out_err;
 369
 370                 /* Deal with unexpected ATA data phase. */
 371                 if (((stat & ATA_DRQ) == 0) ^ (cmd->nleft == 0))
 372                         goto out_err;
 373         }
 374
 375         if (write && cmd->nleft == 0)
 376                 goto out_end;
 377
 378         /* Still data left to transfer. */
 379         ide_pio_datablock(drive, cmd, write);
 380
 381         /* Are we done? Check status and finish transfer. */
 382         if (write == 0 && cmd->nleft == 0) {
 383                 stat = wait_drive_not_busy(drive);
 384                 if (!OK_STAT(stat, 0, BAD_STAT))
 385                         goto out_err;
 386
 387                 goto out_end;
 388         }
 389 out_wait:
 390         /* Still data left to transfer. */
 391         ide_set_handler(drive, &task_pio_intr, WAIT_WORSTCASE);
 392         return ide_started;
 393 out_end:
 394         if ((cmd->tf_flags & IDE_TFLAG_FS) == 0)
 395                 ide_finish_cmd(drive, cmd, stat);
 396         else
 397                 ide_complete_rq(drive, BLK_STS_OK, blk_rq_sectors(cmd->rq) << 9);
 398         return ide_stopped;
 399 out_err:
 400         ide_error_cmd(drive, cmd);
 401         return ide_error(drive, __func__, stat);
 402 }
 403
 404 static ide_startstop_t pre_task_out_intr(ide_drive_t *drive,
 405                                          struct ide_cmd *cmd)
 406 {
 407         ide_startstop_t startstop;
 408
 409         if (ide_wait_stat(&startstop, drive, ATA_DRQ,
 410                           drive->bad_wstat, WAIT_DRQ)) {
 411                 pr_err("%s: no DRQ after issuing %sWRITE%s\n", drive->name,
 412                         (cmd->tf_flags & IDE_TFLAG_MULTI_PIO) ? "MULT" : "",
 413                         (drive->dev_flags & IDE_DFLAG_LBA48) ? "_EXT" : "");
 414                 return startstop;
 415         }
 416
 417         if ((drive->dev_flags & IDE_DFLAG_UNMASK) == 0)
 418                 local_irq_disable();
 419
 420         ide_set_handler(drive, &task_pio_intr, WAIT_WORSTCASE);
 421
 422         ide_pio_datablock(drive, cmd, 1);
 423
 424         return ide_started;
 425 }
 426
 427 int ide_raw_taskfile(ide_drive_t *drive, struct ide_cmd *cmd, u8 *buf,
 428                      u16 nsect)
 429 {
 430         struct request *rq;
 431         int error;
 432
 433         rq = blk_get_request(drive->queue,
 434                 (cmd->tf_flags & IDE_TFLAG_WRITE) ?
 435                         REQ_OP_DRV_OUT : REQ_OP_DRV_IN, __GFP_RECLAIM);
 436         ide_req(rq)->type = ATA_PRIV_TASKFILE;
 437
 438         /*
 439          * (ks) We transfer currently only whole sectors.
 440          * This is suffient for now.  But, it would be great,
 441          * if we would find a solution to transfer any size.
 442          * To support special commands like READ LONG.
 443          */
 444         if (nsect) {
 445                 error = blk_rq_map_kern(drive->queue, rq, buf,
 446                                         nsect * SECTOR_SIZE, __GFP_RECLAIM);
 447                 if (error)
 448                         goto put_req;
 449         }
 450
 451         rq->special = cmd;
 452         cmd->rq = rq;
 453
 454         blk_execute_rq(drive->queue, NULL, rq, 0);
 455         error = scsi_req(rq)->result ? -EIO : 0;
 456 put_req:
 457         blk_put_request(rq);
 458         return error;
 459 }
 460 EXPORT_SYMBOL(ide_raw_taskfile);
 461
 462 int ide_no_data_taskfile(ide_drive_t *drive, struct ide_cmd *cmd)
 463 {
 464         cmd->protocol = ATA_PROT_NODATA;
 465
 466         return ide_raw_taskfile(drive, cmd, NULL, 0);
 467 }
 468 EXPORT_SYMBOL_GPL(ide_no_data_taskfile);
 469
 470 #ifdef CONFIG_IDE_TASK_IOCTL
 471 int ide_taskfile_ioctl(ide_drive_t *drive, unsigned long arg)
 472 {
 473         ide_task_request_t      *req_task;
 474         struct ide_cmd          cmd;
 475         u8 *outbuf              = NULL;
 476         u8 *inbuf               = NULL;
 477         u8 *data_buf            = NULL;
 478         int err                 = 0;
 479         int tasksize            = sizeof(struct ide_task_request_s);
 480         unsigned int taskin     = 0;
 481         unsigned int taskout    = 0;
 482         u16 nsect               = 0;
 483         char __user *buf = (char __user *)arg;
 484
 485         req_task = memdup_user(buf, tasksize);
 486         if (IS_ERR(req_task))
 487                 return PTR_ERR(req_task);
 488
 489         taskout = req_task->out_size;
 490         taskin  = req_task->in_size;
 491
 492         if (taskin > 65536 || taskout > 65536) {
 493                 err = -EINVAL;
 494                 goto abort;
 495         }
 496
 497         if (taskout) {
 498                 int outtotal = tasksize;
 499                 outbuf = kzalloc(taskout, GFP_KERNEL);
 500                 if (outbuf == NULL) {
 501                         err = -ENOMEM;
 502                         goto abort;
 503                 }
 504                 if (copy_from_user(outbuf, buf + outtotal, taskout)) {
 505                         err = -EFAULT;
 506                         goto abort;
 507                 }
 508         }
 509
 510         if (taskin) {
 511                 int intotal = tasksize + taskout;
 512                 inbuf = kzalloc(taskin, GFP_KERNEL);
 513                 if (inbuf == NULL) {
 514                         err = -ENOMEM;
 515                         goto abort;
 516                 }
 517                 if (copy_from_user(inbuf, buf + intotal, taskin)) {
 518                         err = -EFAULT;
 519                         goto abort;
 520                 }
 521         }
 522
 523         memset(&cmd, 0, sizeof(cmd));
 524
 525         memcpy(&cmd.hob, req_task->hob_ports, HDIO_DRIVE_HOB_HDR_SIZE - 2);
 526         memcpy(&cmd.tf,  req_task->io_ports,  HDIO_DRIVE_TASK_HDR_SIZE);
 527
 528         cmd.valid.out.tf = IDE_VALID_DEVICE;
 529         cmd.valid.in.tf  = IDE_VALID_DEVICE | IDE_VALID_IN_TF;
 530         cmd.tf_flags = IDE_TFLAG_IO_16BIT;
 531
 532         if (drive->dev_flags & IDE_DFLAG_LBA48) {
 533                 cmd.tf_flags |= IDE_TFLAG_LBA48;
 534                 cmd.valid.in.hob = IDE_VALID_IN_HOB;
 535         }
 536
 537         if (req_task->out_flags.all) {
 538                 cmd.ftf_flags |= IDE_FTFLAG_FLAGGED;
 539
 540                 if (req_task->out_flags.b.data)
 541                         cmd.ftf_flags |= IDE_FTFLAG_OUT_DATA;
 542
 543                 if (req_task->out_flags.b.nsector_hob)
 544                         cmd.valid.out.hob |= IDE_VALID_NSECT;
 545                 if (req_task->out_flags.b.sector_hob)
 546                         cmd.valid.out.hob |= IDE_VALID_LBAL;
 547                 if (req_task->out_flags.b.lcyl_hob)
 548                         cmd.valid.out.hob |= IDE_VALID_LBAM;
 549                 if (req_task->out_flags.b.hcyl_hob)
 550                         cmd.valid.out.hob |= IDE_VALID_LBAH;
 551
 552                 if (req_task->out_flags.b.error_feature)
 553                         cmd.valid.out.tf  |= IDE_VALID_FEATURE;
 554                 if (req_task->out_flags.b.nsector)
 555                         cmd.valid.out.tf  |= IDE_VALID_NSECT;
 556                 if (req_task->out_flags.b.sector)
 557                         cmd.valid.out.tf  |= IDE_VALID_LBAL;
 558                 if (req_task->out_flags.b.lcyl)
 559                         cmd.valid.out.tf  |= IDE_VALID_LBAM;
 560                 if (req_task->out_flags.b.hcyl)
 561                         cmd.valid.out.tf  |= IDE_VALID_LBAH;
 562         } else {
 563                 cmd.valid.out.tf |= IDE_VALID_OUT_TF;
 564                 if (cmd.tf_flags & IDE_TFLAG_LBA48)
 565                         cmd.valid.out.hob |= IDE_VALID_OUT_HOB;
 566         }
 567
 568         if (req_task->in_flags.b.data)
 569                 cmd.ftf_flags |= IDE_FTFLAG_IN_DATA;
 570
 571         if (req_task->req_cmd == IDE_DRIVE_TASK_RAW_WRITE) {
 572                 /* fixup data phase if needed */
 573                 if (req_task->data_phase == TASKFILE_IN_DMAQ ||
 574                     req_task->data_phase == TASKFILE_IN_DMA)
 575                         cmd.tf_flags |= IDE_TFLAG_WRITE;
 576         }
 577
 578         cmd.protocol = ATA_PROT_DMA;
 579
 580         switch (req_task->data_phase) {
 581         case TASKFILE_MULTI_OUT:
 582                 if (!drive->mult_count) {
 583                         /* (hs): give up if multcount is not set */
 584                         pr_err("%s: %s Multimode Write multcount is not set\n",
 585                                 drive->name, __func__);
 586                         err = -EPERM;
 587                         goto abort;
 588                 }
 589                 cmd.tf_flags |= IDE_TFLAG_MULTI_PIO;
 590                 /* fall through */
 591         case TASKFILE_OUT:
 592                 cmd.protocol = ATA_PROT_PIO;
 593                 /* fall through */
 594         case TASKFILE_OUT_DMAQ:
 595         case TASKFILE_OUT_DMA:
 596                 cmd.tf_flags |= IDE_TFLAG_WRITE;
 597                 nsect = taskout / SECTOR_SIZE;
 598                 data_buf = outbuf;
 599                 break;
 600         case TASKFILE_MULTI_IN:
 601                 if (!drive->mult_count) {
 602                         /* (hs): give up if multcount is not set */
 603                         pr_err("%s: %s Multimode Read multcount is not set\n",
 604                                 drive->name, __func__);
 605                         err = -EPERM;
 606                         goto abort;
 607                 }
 608                 cmd.tf_flags |= IDE_TFLAG_MULTI_PIO;
 609                 /* fall through */
 610         case TASKFILE_IN:
 611                 cmd.protocol = ATA_PROT_PIO;
 612                 /* fall through */
 613         case TASKFILE_IN_DMAQ:
 614         case TASKFILE_IN_DMA:
 615                 nsect = taskin / SECTOR_SIZE;
 616                 data_buf = inbuf;
 617                 break;
 618         case TASKFILE_NO_DATA:
 619                 cmd.protocol = ATA_PROT_NODATA;
 620                 break;
 621         default:
 622                 err = -EFAULT;
 623                 goto abort;
 624         }
 625
 626         if (req_task->req_cmd == IDE_DRIVE_TASK_NO_DATA)
 627                 nsect = 0;
 628         else if (!nsect) {
 629                 nsect = (cmd.hob.nsect << 8) | cmd.tf.nsect;
 630
 631                 if (!nsect) {
 632                         pr_err("%s: in/out command without data\n",
 633                                         drive->name);
 634                         err = -EFAULT;
 635                         goto abort;
 636                 }
 637         }
 638
 639         err = ide_raw_taskfile(drive, &cmd, data_buf, nsect);
 640
 641         memcpy(req_task->hob_ports, &cmd.hob, HDIO_DRIVE_HOB_HDR_SIZE - 2);
 642         memcpy(req_task->io_ports,  &cmd.tf,  HDIO_DRIVE_TASK_HDR_SIZE);
 643
 644         if ((cmd.ftf_flags & IDE_FTFLAG_SET_IN_FLAGS) &&
 645             req_task->in_flags.all == 0) {
 646                 req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
 647                 if (drive->dev_flags & IDE_DFLAG_LBA48)
 648                         req_task->in_flags.all |= (IDE_HOB_STD_IN_FLAGS << 8);
 649         }
 650
 651         if (copy_to_user(buf, req_task, tasksize)) {
 652                 err = -EFAULT;
 653                 goto abort;
 654         }
 655         if (taskout) {
 656                 int outtotal = tasksize;
 657                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
 658                         err = -EFAULT;
 659                         goto abort;
 660                 }
 661         }
 662         if (taskin) {
 663                 int intotal = tasksize + taskout;
 664                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
 665                         err = -EFAULT;
 666                         goto abort;
 667                 }
 668         }
 669 abort:
 670         kfree(req_task);
 671         kfree(outbuf);
 672         kfree(inbuf);
 673
 674         return err;
 675 }
 676 #endif