git.oblomov.eu Git - linux-2.6/blob - drivers/ide/ide-taskfile.c

   1 /*
   2  * linux/drivers/ide/ide-taskfile.c     Version 0.38    March 05, 2003
   3  *
   4  *  Copyright (C) 2000-2002     Michael Cornwell <cornwell@acm.org>
   5  *  Copyright (C) 2000-2002     Andre Hedrick <andre@linux-ide.org>
   6  *  Copyright (C) 2001-2002     Klaus Smolin
   7  *                                      IBM Storage Technology Division
   8  *  Copyright (C) 2003-2004     Bartlomiej Zolnierkiewicz
   9  *
  10  *  The big the bad and the ugly.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/string.h>
  16 #include <linux/kernel.h>
  17 #include <linux/timer.h>
  18 #include <linux/mm.h>
  19 #include <linux/sched.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/major.h>
  22 #include <linux/errno.h>
  23 #include <linux/genhd.h>
  24 #include <linux/blkpg.h>
  25 #include <linux/slab.h>
  26 #include <linux/pci.h>
  27 #include <linux/delay.h>
  28 #include <linux/hdreg.h>
  29 #include <linux/ide.h>
  30 #include <linux/bitops.h>
  31 #include <linux/scatterlist.h>
  32
  33 #include <asm/byteorder.h>
  34 #include <asm/irq.h>
  35 #include <asm/uaccess.h>
  36 #include <asm/io.h>
  37
  38 static void ata_bswap_data (void *buffer, int wcount)
  39 {
  40         u16 *p = buffer;
  41
  42         while (wcount--) {
  43                 *p = *p << 8 | *p >> 8; p++;
  44                 *p = *p << 8 | *p >> 8; p++;
  45         }
  46 }
  47
  48 static void taskfile_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
  49 {
  50         HWIF(drive)->ata_input_data(drive, buffer, wcount);
  51         if (drive->bswap)
  52                 ata_bswap_data(buffer, wcount);
  53 }
  54
  55 static void taskfile_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
  56 {
  57         if (drive->bswap) {
  58                 ata_bswap_data(buffer, wcount);
  59                 HWIF(drive)->ata_output_data(drive, buffer, wcount);
  60                 ata_bswap_data(buffer, wcount);
  61         } else {
  62                 HWIF(drive)->ata_output_data(drive, buffer, wcount);
  63         }
  64 }
  65
  66 int taskfile_lib_get_identify (ide_drive_t *drive, u8 *buf)
  67 {
  68         ide_task_t args;
  69         memset(&args, 0, sizeof(ide_task_t));
  70         args.tfRegister[IDE_NSECTOR_OFFSET]     = 0x01;
  71         if (drive->media == ide_disk)
  72                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_IDENTIFY;
  73         else
  74                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_PIDENTIFY;
  75         args.command_type = IDE_DRIVE_TASK_IN;
  76         args.data_phase   = TASKFILE_IN;
  77         args.handler      = &task_in_intr;
  78         return ide_raw_taskfile(drive, &args, buf);
  79 }
  80
  81 ide_startstop_t do_rw_taskfile (ide_drive_t *drive, ide_task_t *task)
  82 {
  83         ide_hwif_t *hwif        = HWIF(drive);
  84         task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
  85         hob_struct_t *hobfile   = (hob_struct_t *) task->hobRegister;
  86         u8 HIHI                 = (drive->addressing == 1) ? 0xE0 : 0xEF;
  87
  88         /* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
  89         if (IDE_CONTROL_REG) {
  90                 /* clear nIEN */
  91                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
  92         }
  93         SELECT_MASK(drive, 0);
  94
  95         if (drive->addressing == 1) {
  96                 hwif->OUTB(hobfile->feature, IDE_FEATURE_REG);
  97                 hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
  98                 hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
  99                 hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
 100                 hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
 101         }
 102
 103         hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
 104         hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
 105         hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
 106         hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
 107         hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
 108
 109         hwif->OUTB((taskfile->device_head & HIHI) | drive->select.all, IDE_SELECT_REG);
 110
 111         if (task->handler != NULL) {
 112                 if (task->prehandler != NULL) {
 113                         hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
 114                         ndelay(400);    /* FIXME */
 115                         return task->prehandler(drive, task->rq);
 116                 }
 117                 ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
 118                 return ide_started;
 119         }
 120
 121         if (!drive->using_dma)
 122                 return ide_stopped;
 123
 124         switch (taskfile->command) {
 125                 case WIN_WRITEDMA_ONCE:
 126                 case WIN_WRITEDMA:
 127                 case WIN_WRITEDMA_EXT:
 128                 case WIN_READDMA_ONCE:
 129                 case WIN_READDMA:
 130                 case WIN_READDMA_EXT:
 131                 case WIN_IDENTIFY_DMA:
 132                         if (!hwif->dma_setup(drive)) {
 133                                 hwif->dma_exec_cmd(drive, taskfile->command);
 134                                 hwif->dma_start(drive);
 135                                 return ide_started;
 136                         }
 137                         break;
 138                 default:
 139                         if (task->handler == NULL)
 140                                 return ide_stopped;
 141         }
 142
 143         return ide_stopped;
 144 }
 145
 146 /*
 147  * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
 148  */
 149 ide_startstop_t set_multmode_intr (ide_drive_t *drive)
 150 {
 151         ide_hwif_t *hwif = HWIF(drive);
 152         u8 stat;
 153
 154         if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
 155                 drive->mult_count = drive->mult_req;
 156         } else {
 157                 drive->mult_req = drive->mult_count = 0;
 158                 drive->special.b.recalibrate = 1;
 159                 (void) ide_dump_status(drive, "set_multmode", stat);
 160         }
 161         return ide_stopped;
 162 }
 163
 164 /*
 165  * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
 166  */
 167 ide_startstop_t set_geometry_intr (ide_drive_t *drive)
 168 {
 169         ide_hwif_t *hwif = HWIF(drive);
 170         int retries = 5;
 171         u8 stat;
 172
 173         while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
 174                 udelay(10);
 175
 176         if (OK_STAT(stat, READY_STAT, BAD_STAT))
 177                 return ide_stopped;
 178
 179         if (stat & (ERR_STAT|DRQ_STAT))
 180                 return ide_error(drive, "set_geometry_intr", stat);
 181
 182         BUG_ON(HWGROUP(drive)->handler != NULL);
 183         ide_set_handler(drive, &set_geometry_intr, WAIT_WORSTCASE, NULL);
 184         return ide_started;
 185 }
 186
 187 /*
 188  * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
 189  */
 190 ide_startstop_t recal_intr (ide_drive_t *drive)
 191 {
 192         ide_hwif_t *hwif = HWIF(drive);
 193         u8 stat;
 194
 195         if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG), READY_STAT, BAD_STAT))
 196                 return ide_error(drive, "recal_intr", stat);
 197         return ide_stopped;
 198 }
 199
 200 /*
 201  * Handler for commands without a data phase
 202  */
 203 ide_startstop_t task_no_data_intr (ide_drive_t *drive)
 204 {
 205         ide_task_t *args        = HWGROUP(drive)->rq->special;
 206         ide_hwif_t *hwif        = HWIF(drive);
 207         u8 stat;
 208
 209         local_irq_enable_in_hardirq();
 210         if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
 211                 return ide_error(drive, "task_no_data_intr", stat);
 212                 /* calls ide_end_drive_cmd */
 213         }
 214         if (args)
 215                 ide_end_drive_cmd(drive, stat, hwif->INB(IDE_ERROR_REG));
 216
 217         return ide_stopped;
 218 }
 219
 220 EXPORT_SYMBOL(task_no_data_intr);
 221
 222 static u8 wait_drive_not_busy(ide_drive_t *drive)
 223 {
 224         ide_hwif_t *hwif = HWIF(drive);
 225         int retries;
 226         u8 stat;
 227
 228         /*
 229          * Last sector was transfered, wait until drive is ready.
 230          * This can take up to 10 usec, but we will wait max 1 ms
 231          * (drive_cmd_intr() waits that long).
 232          */
 233         for (retries = 0; retries < 100; retries++) {
 234                 if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT)
 235                         udelay(10);
 236                 else
 237                         break;
 238         }
 239
 240         if (stat & BUSY_STAT)
 241                 printk(KERN_ERR "%s: drive still BUSY!\n", drive->name);
 242
 243         return stat;
 244 }
 245
 246 static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
 247 {
 248         ide_hwif_t *hwif = drive->hwif;
 249         struct scatterlist *sg = hwif->sg_table;
 250         struct scatterlist *cursg = hwif->cursg;
 251         struct page *page;
 252 #ifdef CONFIG_HIGHMEM
 253         unsigned long flags;
 254 #endif
 255         unsigned int offset;
 256         u8 *buf;
 257
 258         cursg = hwif->cursg;
 259         if (!cursg) {
 260                 cursg = sg;
 261                 hwif->cursg = sg;
 262         }
 263
 264         page = sg_page(cursg);
 265         offset = cursg->offset + hwif->cursg_ofs * SECTOR_SIZE;
 266
 267         /* get the current page and offset */
 268         page = nth_page(page, (offset >> PAGE_SHIFT));
 269         offset %= PAGE_SIZE;
 270
 271 #ifdef CONFIG_HIGHMEM
 272         local_irq_save(flags);
 273 #endif
 274         buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
 275
 276         hwif->nleft--;
 277         hwif->cursg_ofs++;
 278
 279         if ((hwif->cursg_ofs * SECTOR_SIZE) == cursg->length) {
 280                 hwif->cursg = sg_next(hwif->cursg);
 281                 hwif->cursg_ofs = 0;
 282         }
 283
 284         /* do the actual data transfer */
 285         if (write)
 286                 taskfile_output_data(drive, buf, SECTOR_WORDS);
 287         else
 288                 taskfile_input_data(drive, buf, SECTOR_WORDS);
 289
 290         kunmap_atomic(buf, KM_BIO_SRC_IRQ);
 291 #ifdef CONFIG_HIGHMEM
 292         local_irq_restore(flags);
 293 #endif
 294 }
 295
 296 static void ide_pio_multi(ide_drive_t *drive, unsigned int write)
 297 {
 298         unsigned int nsect;
 299
 300         nsect = min_t(unsigned int, drive->hwif->nleft, drive->mult_count);
 301         while (nsect--)
 302                 ide_pio_sector(drive, write);
 303 }
 304
 305 static void ide_pio_datablock(ide_drive_t *drive, struct request *rq,
 306                                      unsigned int write)
 307 {
 308         if (rq->bio)    /* fs request */
 309                 rq->errors = 0;
 310
 311         touch_softlockup_watchdog();
 312
 313         switch (drive->hwif->data_phase) {
 314         case TASKFILE_MULTI_IN:
 315         case TASKFILE_MULTI_OUT:
 316                 ide_pio_multi(drive, write);
 317                 break;
 318         default:
 319                 ide_pio_sector(drive, write);
 320                 break;
 321         }
 322 }
 323
 324 static ide_startstop_t task_error(ide_drive_t *drive, struct request *rq,
 325                                   const char *s, u8 stat)
 326 {
 327         if (rq->bio) {
 328                 ide_hwif_t *hwif = drive->hwif;
 329                 int sectors = hwif->nsect - hwif->nleft;
 330
 331                 switch (hwif->data_phase) {
 332                 case TASKFILE_IN:
 333                         if (hwif->nleft)
 334                                 break;
 335                         /* fall through */
 336                 case TASKFILE_OUT:
 337                         sectors--;
 338                         break;
 339                 case TASKFILE_MULTI_IN:
 340                         if (hwif->nleft)
 341                                 break;
 342                         /* fall through */
 343                 case TASKFILE_MULTI_OUT:
 344                         sectors -= drive->mult_count;
 345                 default:
 346                         break;
 347                 }
 348
 349                 if (sectors > 0) {
 350                         ide_driver_t *drv;
 351
 352                         drv = *(ide_driver_t **)rq->rq_disk->private_data;
 353                         drv->end_request(drive, 1, sectors);
 354                 }
 355         }
 356         return ide_error(drive, s, stat);
 357 }
 358
 359 static void task_end_request(ide_drive_t *drive, struct request *rq, u8 stat)
 360 {
 361         HWIF(drive)->cursg = NULL;
 362
 363         if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
 364                 ide_task_t *task = rq->special;
 365
 366                 if (task->tf_out_flags.all) {
 367                         u8 err = drive->hwif->INB(IDE_ERROR_REG);
 368                         ide_end_drive_cmd(drive, stat, err);
 369                         return;
 370                 }
 371         }
 372
 373         if (rq->rq_disk) {
 374                 ide_driver_t *drv;
 375
 376                 drv = *(ide_driver_t **)rq->rq_disk->private_data;;
 377                 drv->end_request(drive, 1, rq->hard_nr_sectors);
 378         } else
 379                 ide_end_request(drive, 1, rq->hard_nr_sectors);
 380 }
 381
 382 /*
 383  * Handler for command with PIO data-in phase (Read/Read Multiple).
 384  */
 385 ide_startstop_t task_in_intr (ide_drive_t *drive)
 386 {
 387         ide_hwif_t *hwif = drive->hwif;
 388         struct request *rq = HWGROUP(drive)->rq;
 389         u8 stat = hwif->INB(IDE_STATUS_REG);
 390
 391         /* new way for dealing with premature shared PCI interrupts */
 392         if (!OK_STAT(stat, DATA_READY, BAD_R_STAT)) {
 393                 if (stat & (ERR_STAT | DRQ_STAT))
 394                         return task_error(drive, rq, __FUNCTION__, stat);
 395                 /* No data yet, so wait for another IRQ. */
 396                 ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
 397                 return ide_started;
 398         }
 399
 400         ide_pio_datablock(drive, rq, 0);
 401
 402         /* If it was the last datablock check status and finish transfer. */
 403         if (!hwif->nleft) {
 404                 stat = wait_drive_not_busy(drive);
 405                 if (!OK_STAT(stat, 0, BAD_R_STAT))
 406                         return task_error(drive, rq, __FUNCTION__, stat);
 407                 task_end_request(drive, rq, stat);
 408                 return ide_stopped;
 409         }
 410
 411         /* Still data left to transfer. */
 412         ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
 413
 414         return ide_started;
 415 }
 416 EXPORT_SYMBOL(task_in_intr);
 417
 418 /*
 419  * Handler for command with PIO data-out phase (Write/Write Multiple).
 420  */
 421 static ide_startstop_t task_out_intr (ide_drive_t *drive)
 422 {
 423         ide_hwif_t *hwif = drive->hwif;
 424         struct request *rq = HWGROUP(drive)->rq;
 425         u8 stat = hwif->INB(IDE_STATUS_REG);
 426
 427         if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat))
 428                 return task_error(drive, rq, __FUNCTION__, stat);
 429
 430         /* Deal with unexpected ATA data phase. */
 431         if (((stat & DRQ_STAT) == 0) ^ !hwif->nleft)
 432                 return task_error(drive, rq, __FUNCTION__, stat);
 433
 434         if (!hwif->nleft) {
 435                 task_end_request(drive, rq, stat);
 436                 return ide_stopped;
 437         }
 438
 439         /* Still data left to transfer. */
 440         ide_pio_datablock(drive, rq, 1);
 441         ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
 442
 443         return ide_started;
 444 }
 445
 446 ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq)
 447 {
 448         ide_startstop_t startstop;
 449
 450         if (ide_wait_stat(&startstop, drive, DATA_READY,
 451                           drive->bad_wstat, WAIT_DRQ)) {
 452                 printk(KERN_ERR "%s: no DRQ after issuing %sWRITE%s\n",
 453                                 drive->name,
 454                                 drive->hwif->data_phase ? "MULT" : "",
 455                                 drive->addressing ? "_EXT" : "");
 456                 return startstop;
 457         }
 458
 459         if (!drive->unmask)
 460                 local_irq_disable();
 461
 462         ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
 463         ide_pio_datablock(drive, rq, 1);
 464
 465         return ide_started;
 466 }
 467 EXPORT_SYMBOL(pre_task_out_intr);
 468
 469 static int ide_diag_taskfile(ide_drive_t *drive, ide_task_t *args, unsigned long data_size, u8 *buf)
 470 {
 471         struct request rq;
 472
 473         memset(&rq, 0, sizeof(rq));
 474         rq.ref_count = 1;
 475         rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
 476         rq.buffer = buf;
 477
 478         /*
 479          * (ks) We transfer currently only whole sectors.
 480          * This is suffient for now.  But, it would be great,
 481          * if we would find a solution to transfer any size.
 482          * To support special commands like READ LONG.
 483          */
 484         if (args->command_type != IDE_DRIVE_TASK_NO_DATA) {
 485                 if (data_size == 0)
 486                         rq.nr_sectors = (args->hobRegister[IDE_NSECTOR_OFFSET] << 8) | args->tfRegister[IDE_NSECTOR_OFFSET];
 487                 else
 488                         rq.nr_sectors = data_size / SECTOR_SIZE;
 489
 490                 if (!rq.nr_sectors) {
 491                         printk(KERN_ERR "%s: in/out command without data\n",
 492                                         drive->name);
 493                         return -EFAULT;
 494                 }
 495
 496                 rq.hard_nr_sectors = rq.nr_sectors;
 497                 rq.hard_cur_sectors = rq.current_nr_sectors = rq.nr_sectors;
 498
 499                 if (args->command_type == IDE_DRIVE_TASK_RAW_WRITE)
 500                         rq.cmd_flags |= REQ_RW;
 501         }
 502
 503         rq.special = args;
 504         args->rq = &rq;
 505         return ide_do_drive_cmd(drive, &rq, ide_wait);
 506 }
 507
 508 int ide_raw_taskfile (ide_drive_t *drive, ide_task_t *args, u8 *buf)
 509 {
 510         return ide_diag_taskfile(drive, args, 0, buf);
 511 }
 512
 513 EXPORT_SYMBOL(ide_raw_taskfile);
 514
 515 #ifdef CONFIG_IDE_TASK_IOCTL
 516 int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 517 {
 518         ide_task_request_t      *req_task;
 519         ide_task_t              args;
 520         u8 *outbuf              = NULL;
 521         u8 *inbuf               = NULL;
 522         task_ioreg_t *argsptr   = args.tfRegister;
 523         task_ioreg_t *hobsptr   = args.hobRegister;
 524         int err                 = 0;
 525         int tasksize            = sizeof(struct ide_task_request_s);
 526         unsigned int taskin     = 0;
 527         unsigned int taskout    = 0;
 528         u8 io_32bit             = drive->io_32bit;
 529         char __user *buf = (char __user *)arg;
 530
 531 //      printk("IDE Taskfile ...\n");
 532
 533         req_task = kzalloc(tasksize, GFP_KERNEL);
 534         if (req_task == NULL) return -ENOMEM;
 535         if (copy_from_user(req_task, buf, tasksize)) {
 536                 kfree(req_task);
 537                 return -EFAULT;
 538         }
 539
 540         taskout = req_task->out_size;
 541         taskin  = req_task->in_size;
 542
 543         if (taskin > 65536 || taskout > 65536) {
 544                 err = -EINVAL;
 545                 goto abort;
 546         }
 547
 548         if (taskout) {
 549                 int outtotal = tasksize;
 550                 outbuf = kzalloc(taskout, GFP_KERNEL);
 551                 if (outbuf == NULL) {
 552                         err = -ENOMEM;
 553                         goto abort;
 554                 }
 555                 if (copy_from_user(outbuf, buf + outtotal, taskout)) {
 556                         err = -EFAULT;
 557                         goto abort;
 558                 }
 559         }
 560
 561         if (taskin) {
 562                 int intotal = tasksize + taskout;
 563                 inbuf = kzalloc(taskin, GFP_KERNEL);
 564                 if (inbuf == NULL) {
 565                         err = -ENOMEM;
 566                         goto abort;
 567                 }
 568                 if (copy_from_user(inbuf, buf + intotal, taskin)) {
 569                         err = -EFAULT;
 570                         goto abort;
 571                 }
 572         }
 573
 574         memset(&args, 0, sizeof(ide_task_t));
 575         memcpy(argsptr, req_task->io_ports, HDIO_DRIVE_TASK_HDR_SIZE);
 576         memcpy(hobsptr, req_task->hob_ports, HDIO_DRIVE_HOB_HDR_SIZE);
 577
 578         args.tf_in_flags  = req_task->in_flags;
 579         args.tf_out_flags = req_task->out_flags;
 580         args.data_phase   = req_task->data_phase;
 581         args.command_type = req_task->req_cmd;
 582
 583         drive->io_32bit = 0;
 584         switch(req_task->data_phase) {
 585                 case TASKFILE_OUT_DMAQ:
 586                 case TASKFILE_OUT_DMA:
 587                         err = ide_diag_taskfile(drive, &args, taskout, outbuf);
 588                         break;
 589                 case TASKFILE_IN_DMAQ:
 590                 case TASKFILE_IN_DMA:
 591                         err = ide_diag_taskfile(drive, &args, taskin, inbuf);
 592                         break;
 593                 case TASKFILE_MULTI_OUT:
 594                         if (!drive->mult_count) {
 595                                 /* (hs): give up if multcount is not set */
 596                                 printk(KERN_ERR "%s: %s Multimode Write " \
 597                                         "multcount is not set\n",
 598                                         drive->name, __FUNCTION__);
 599                                 err = -EPERM;
 600                                 goto abort;
 601                         }
 602                         /* fall through */
 603                 case TASKFILE_OUT:
 604                         args.prehandler = &pre_task_out_intr;
 605                         args.handler = &task_out_intr;
 606                         err = ide_diag_taskfile(drive, &args, taskout, outbuf);
 607                         break;
 608                 case TASKFILE_MULTI_IN:
 609                         if (!drive->mult_count) {
 610                                 /* (hs): give up if multcount is not set */
 611                                 printk(KERN_ERR "%s: %s Multimode Read failure " \
 612                                         "multcount is not set\n",
 613                                         drive->name, __FUNCTION__);
 614                                 err = -EPERM;
 615                                 goto abort;
 616                         }
 617                         /* fall through */
 618                 case TASKFILE_IN:
 619                         args.handler = &task_in_intr;
 620                         err = ide_diag_taskfile(drive, &args, taskin, inbuf);
 621                         break;
 622                 case TASKFILE_NO_DATA:
 623                         args.handler = &task_no_data_intr;
 624                         err = ide_diag_taskfile(drive, &args, 0, NULL);
 625                         break;
 626                 default:
 627                         err = -EFAULT;
 628                         goto abort;
 629         }
 630
 631         memcpy(req_task->io_ports, &(args.tfRegister), HDIO_DRIVE_TASK_HDR_SIZE);
 632         memcpy(req_task->hob_ports, &(args.hobRegister), HDIO_DRIVE_HOB_HDR_SIZE);
 633         req_task->in_flags  = args.tf_in_flags;
 634         req_task->out_flags = args.tf_out_flags;
 635
 636         if (copy_to_user(buf, req_task, tasksize)) {
 637                 err = -EFAULT;
 638                 goto abort;
 639         }
 640         if (taskout) {
 641                 int outtotal = tasksize;
 642                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
 643                         err = -EFAULT;
 644                         goto abort;
 645                 }
 646         }
 647         if (taskin) {
 648                 int intotal = tasksize + taskout;
 649                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
 650                         err = -EFAULT;
 651                         goto abort;
 652                 }
 653         }
 654 abort:
 655         kfree(req_task);
 656         kfree(outbuf);
 657         kfree(inbuf);
 658
 659 //      printk("IDE Taskfile ioctl ended. rc = %i\n", err);
 660
 661         drive->io_32bit = io_32bit;
 662
 663         return err;
 664 }
 665 #endif
 666
 667 int ide_wait_cmd (ide_drive_t *drive, u8 cmd, u8 nsect, u8 feature, u8 sectors, u8 *buf)
 668 {
 669         struct request rq;
 670         u8 buffer[4];
 671
 672         if (!buf)
 673                 buf = buffer;
 674         memset(buf, 0, 4 + SECTOR_WORDS * 4 * sectors);
 675         ide_init_drive_cmd(&rq);
 676         rq.buffer = buf;
 677         *buf++ = cmd;
 678         *buf++ = nsect;
 679         *buf++ = feature;
 680         *buf++ = sectors;
 681         return ide_do_drive_cmd(drive, &rq, ide_wait);
 682 }
 683
 684 int ide_cmd_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 685 {
 686         int err = 0;
 687         u8 args[4], *argbuf = args;
 688         u8 xfer_rate = 0;
 689         int argsize = 4;
 690         ide_task_t tfargs;
 691
 692         if (NULL == (void *) arg) {
 693                 struct request rq;
 694                 ide_init_drive_cmd(&rq);
 695                 return ide_do_drive_cmd(drive, &rq, ide_wait);
 696         }
 697
 698         if (copy_from_user(args, (void __user *)arg, 4))
 699                 return -EFAULT;
 700
 701         memset(&tfargs, 0, sizeof(ide_task_t));
 702         tfargs.tfRegister[IDE_FEATURE_OFFSET] = args[2];
 703         tfargs.tfRegister[IDE_NSECTOR_OFFSET] = args[3];
 704         tfargs.tfRegister[IDE_SECTOR_OFFSET]  = args[1];
 705         tfargs.tfRegister[IDE_LCYL_OFFSET]    = 0x00;
 706         tfargs.tfRegister[IDE_HCYL_OFFSET]    = 0x00;
 707         tfargs.tfRegister[IDE_SELECT_OFFSET]  = 0x00;
 708         tfargs.tfRegister[IDE_COMMAND_OFFSET] = args[0];
 709
 710         if (args[3]) {
 711                 argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
 712                 argbuf = kzalloc(argsize, GFP_KERNEL);
 713                 if (argbuf == NULL)
 714                         return -ENOMEM;
 715         }
 716         if (set_transfer(drive, &tfargs)) {
 717                 xfer_rate = args[1];
 718                 if (ide_ata66_check(drive, &tfargs))
 719                         goto abort;
 720         }
 721
 722         err = ide_wait_cmd(drive, args[0], args[1], args[2], args[3], argbuf);
 723
 724         if (!err && xfer_rate) {
 725                 /* active-retuning-calls future */
 726                 ide_set_xfer_rate(drive, xfer_rate);
 727                 ide_driveid_update(drive);
 728         }
 729 abort:
 730         if (copy_to_user((void __user *)arg, argbuf, argsize))
 731                 err = -EFAULT;
 732         if (argsize > 4)
 733                 kfree(argbuf);
 734         return err;
 735 }
 736
 737 static int ide_wait_cmd_task(ide_drive_t *drive, u8 *buf)
 738 {
 739         struct request rq;
 740
 741         ide_init_drive_cmd(&rq);
 742         rq.cmd_type = REQ_TYPE_ATA_TASK;
 743         rq.buffer = buf;
 744         return ide_do_drive_cmd(drive, &rq, ide_wait);
 745 }
 746
 747 int ide_task_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 748 {
 749         void __user *p = (void __user *)arg;
 750         int err = 0;
 751         u8 args[7], *argbuf = args;
 752         int argsize = 7;
 753
 754         if (copy_from_user(args, p, 7))
 755                 return -EFAULT;
 756         err = ide_wait_cmd_task(drive, argbuf);
 757         if (copy_to_user(p, argbuf, argsize))
 758                 err = -EFAULT;
 759         return err;
 760 }
 761
 762 /*
 763  * NOTICE: This is additions from IBM to provide a discrete interface,
 764  * for selective taskregister access operations.  Nice JOB Klaus!!!
 765  * Glad to be able to work and co-develop this with you and IBM.
 766  */
 767 ide_startstop_t flagged_taskfile (ide_drive_t *drive, ide_task_t *task)
 768 {
 769         ide_hwif_t *hwif        = HWIF(drive);
 770         task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
 771         hob_struct_t *hobfile   = (hob_struct_t *) task->hobRegister;
 772
 773         if (task->data_phase == TASKFILE_MULTI_IN ||
 774             task->data_phase == TASKFILE_MULTI_OUT) {
 775                 if (!drive->mult_count) {
 776                         printk(KERN_ERR "%s: multimode not set!\n", drive->name);
 777                         return ide_stopped;
 778                 }
 779         }
 780
 781         /*
 782          * (ks) Check taskfile in flags.
 783          * If set, then execute as it is defined.
 784          * If not set, then define default settings.
 785          * The default values are:
 786          *      read all taskfile registers (except data)
 787          *      read the hob registers (sector, nsector, lcyl, hcyl)
 788          */
 789         if (task->tf_in_flags.all == 0) {
 790                 task->tf_in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
 791                 if (drive->addressing == 1)
 792                         task->tf_in_flags.all |= (IDE_HOB_STD_IN_FLAGS  << 8);
 793         }
 794
 795         /* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
 796         if (IDE_CONTROL_REG)
 797                 /* clear nIEN */
 798                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 799         SELECT_MASK(drive, 0);
 800
 801         if (task->tf_out_flags.b.data) {
 802                 u16 data =  taskfile->data + (hobfile->data << 8);
 803                 hwif->OUTW(data, IDE_DATA_REG);
 804         }
 805
 806         /* (ks) send hob registers first */
 807         if (task->tf_out_flags.b.nsector_hob)
 808                 hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
 809         if (task->tf_out_flags.b.sector_hob)
 810                 hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
 811         if (task->tf_out_flags.b.lcyl_hob)
 812                 hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
 813         if (task->tf_out_flags.b.hcyl_hob)
 814                 hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
 815
 816         /* (ks) Send now the standard registers */
 817         if (task->tf_out_flags.b.error_feature)
 818                 hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
 819         /* refers to number of sectors to transfer */
 820         if (task->tf_out_flags.b.nsector)
 821                 hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
 822         /* refers to sector offset or start sector */
 823         if (task->tf_out_flags.b.sector)
 824                 hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
 825         if (task->tf_out_flags.b.lcyl)
 826                 hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
 827         if (task->tf_out_flags.b.hcyl)
 828                 hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
 829
 830         /*
 831          * (ks) In the flagged taskfile approch, we will use all specified
 832          * registers and the register value will not be changed, except the
 833          * select bit (master/slave) in the drive_head register. We must make
 834          * sure that the desired drive is selected.
 835          */
 836         hwif->OUTB(taskfile->device_head | drive->select.all, IDE_SELECT_REG);
 837         switch(task->data_phase) {
 838
 839                 case TASKFILE_OUT_DMAQ:
 840                 case TASKFILE_OUT_DMA:
 841                 case TASKFILE_IN_DMAQ:
 842                 case TASKFILE_IN_DMA:
 843                         if (!drive->using_dma)
 844                                 break;
 845
 846                         if (!hwif->dma_setup(drive)) {
 847                                 hwif->dma_exec_cmd(drive, taskfile->command);
 848                                 hwif->dma_start(drive);
 849                                 return ide_started;
 850                         }
 851                         break;
 852
 853                 default:
 854                         if (task->handler == NULL)
 855                                 return ide_stopped;
 856
 857                         /* Issue the command */
 858                         if (task->prehandler) {
 859                                 hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
 860                                 ndelay(400);    /* FIXME */
 861                                 return task->prehandler(drive, task->rq);
 862                         }
 863                         ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
 864                         return ide_started;
 865         }
 866
 867         return ide_stopped;
 868 }