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.cmd_type = REQ_TYPE_ATA_TASKFILE;
 475         rq.buffer = buf;
 476
 477         /*
 478          * (ks) We transfer currently only whole sectors.
 479          * This is suffient for now.  But, it would be great,
 480          * if we would find a solution to transfer any size.
 481          * To support special commands like READ LONG.
 482          */
 483         if (args->command_type != IDE_DRIVE_TASK_NO_DATA) {
 484                 if (data_size == 0)
 485                         rq.nr_sectors = (args->hobRegister[IDE_NSECTOR_OFFSET] << 8) | args->tfRegister[IDE_NSECTOR_OFFSET];
 486                 else
 487                         rq.nr_sectors = data_size / SECTOR_SIZE;
 488
 489                 if (!rq.nr_sectors) {
 490                         printk(KERN_ERR "%s: in/out command without data\n",
 491                                         drive->name);
 492                         return -EFAULT;
 493                 }
 494
 495                 rq.hard_nr_sectors = rq.nr_sectors;
 496                 rq.hard_cur_sectors = rq.current_nr_sectors = rq.nr_sectors;
 497
 498                 if (args->command_type == IDE_DRIVE_TASK_RAW_WRITE)
 499                         rq.cmd_flags |= REQ_RW;
 500         }
 501
 502         rq.special = args;
 503         args->rq = &rq;
 504         return ide_do_drive_cmd(drive, &rq, ide_wait);
 505 }
 506
 507 int ide_raw_taskfile (ide_drive_t *drive, ide_task_t *args, u8 *buf)
 508 {
 509         return ide_diag_taskfile(drive, args, 0, buf);
 510 }
 511
 512 EXPORT_SYMBOL(ide_raw_taskfile);
 513
 514 int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 515 {
 516         ide_task_request_t      *req_task;
 517         ide_task_t              args;
 518         u8 *outbuf              = NULL;
 519         u8 *inbuf               = NULL;
 520         task_ioreg_t *argsptr   = args.tfRegister;
 521         task_ioreg_t *hobsptr   = args.hobRegister;
 522         int err                 = 0;
 523         int tasksize            = sizeof(struct ide_task_request_s);
 524         unsigned int taskin     = 0;
 525         unsigned int taskout    = 0;
 526         u8 io_32bit             = drive->io_32bit;
 527         char __user *buf = (char __user *)arg;
 528
 529 //      printk("IDE Taskfile ...\n");
 530
 531         req_task = kzalloc(tasksize, GFP_KERNEL);
 532         if (req_task == NULL) return -ENOMEM;
 533         if (copy_from_user(req_task, buf, tasksize)) {
 534                 kfree(req_task);
 535                 return -EFAULT;
 536         }
 537
 538         taskout = req_task->out_size;
 539         taskin  = req_task->in_size;
 540
 541         if (taskin > 65536 || taskout > 65536) {
 542                 err = -EINVAL;
 543                 goto abort;
 544         }
 545
 546         if (taskout) {
 547                 int outtotal = tasksize;
 548                 outbuf = kzalloc(taskout, GFP_KERNEL);
 549                 if (outbuf == NULL) {
 550                         err = -ENOMEM;
 551                         goto abort;
 552                 }
 553                 if (copy_from_user(outbuf, buf + outtotal, taskout)) {
 554                         err = -EFAULT;
 555                         goto abort;
 556                 }
 557         }
 558
 559         if (taskin) {
 560                 int intotal = tasksize + taskout;
 561                 inbuf = kzalloc(taskin, GFP_KERNEL);
 562                 if (inbuf == NULL) {
 563                         err = -ENOMEM;
 564                         goto abort;
 565                 }
 566                 if (copy_from_user(inbuf, buf + intotal, taskin)) {
 567                         err = -EFAULT;
 568                         goto abort;
 569                 }
 570         }
 571
 572         memset(&args, 0, sizeof(ide_task_t));
 573         memcpy(argsptr, req_task->io_ports, HDIO_DRIVE_TASK_HDR_SIZE);
 574         memcpy(hobsptr, req_task->hob_ports, HDIO_DRIVE_HOB_HDR_SIZE);
 575
 576         args.tf_in_flags  = req_task->in_flags;
 577         args.tf_out_flags = req_task->out_flags;
 578         args.data_phase   = req_task->data_phase;
 579         args.command_type = req_task->req_cmd;
 580
 581         drive->io_32bit = 0;
 582         switch(req_task->data_phase) {
 583                 case TASKFILE_OUT_DMAQ:
 584                 case TASKFILE_OUT_DMA:
 585                         err = ide_diag_taskfile(drive, &args, taskout, outbuf);
 586                         break;
 587                 case TASKFILE_IN_DMAQ:
 588                 case TASKFILE_IN_DMA:
 589                         err = ide_diag_taskfile(drive, &args, taskin, inbuf);
 590                         break;
 591                 case TASKFILE_MULTI_OUT:
 592                         if (!drive->mult_count) {
 593                                 /* (hs): give up if multcount is not set */
 594                                 printk(KERN_ERR "%s: %s Multimode Write " \
 595                                         "multcount is not set\n",
 596                                         drive->name, __FUNCTION__);
 597                                 err = -EPERM;
 598                                 goto abort;
 599                         }
 600                         /* fall through */
 601                 case TASKFILE_OUT:
 602                         args.prehandler = &pre_task_out_intr;
 603                         args.handler = &task_out_intr;
 604                         err = ide_diag_taskfile(drive, &args, taskout, outbuf);
 605                         break;
 606                 case TASKFILE_MULTI_IN:
 607                         if (!drive->mult_count) {
 608                                 /* (hs): give up if multcount is not set */
 609                                 printk(KERN_ERR "%s: %s Multimode Read failure " \
 610                                         "multcount is not set\n",
 611                                         drive->name, __FUNCTION__);
 612                                 err = -EPERM;
 613                                 goto abort;
 614                         }
 615                         /* fall through */
 616                 case TASKFILE_IN:
 617                         args.handler = &task_in_intr;
 618                         err = ide_diag_taskfile(drive, &args, taskin, inbuf);
 619                         break;
 620                 case TASKFILE_NO_DATA:
 621                         args.handler = &task_no_data_intr;
 622                         err = ide_diag_taskfile(drive, &args, 0, NULL);
 623                         break;
 624                 default:
 625                         err = -EFAULT;
 626                         goto abort;
 627         }
 628
 629         memcpy(req_task->io_ports, &(args.tfRegister), HDIO_DRIVE_TASK_HDR_SIZE);
 630         memcpy(req_task->hob_ports, &(args.hobRegister), HDIO_DRIVE_HOB_HDR_SIZE);
 631         req_task->in_flags  = args.tf_in_flags;
 632         req_task->out_flags = args.tf_out_flags;
 633
 634         if (copy_to_user(buf, req_task, tasksize)) {
 635                 err = -EFAULT;
 636                 goto abort;
 637         }
 638         if (taskout) {
 639                 int outtotal = tasksize;
 640                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
 641                         err = -EFAULT;
 642                         goto abort;
 643                 }
 644         }
 645         if (taskin) {
 646                 int intotal = tasksize + taskout;
 647                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
 648                         err = -EFAULT;
 649                         goto abort;
 650                 }
 651         }
 652 abort:
 653         kfree(req_task);
 654         kfree(outbuf);
 655         kfree(inbuf);
 656
 657 //      printk("IDE Taskfile ioctl ended. rc = %i\n", err);
 658
 659         drive->io_32bit = io_32bit;
 660
 661         return err;
 662 }
 663
 664 int ide_wait_cmd (ide_drive_t *drive, u8 cmd, u8 nsect, u8 feature, u8 sectors, u8 *buf)
 665 {
 666         struct request rq;
 667         u8 buffer[4];
 668
 669         if (!buf)
 670                 buf = buffer;
 671         memset(buf, 0, 4 + SECTOR_WORDS * 4 * sectors);
 672         ide_init_drive_cmd(&rq);
 673         rq.buffer = buf;
 674         *buf++ = cmd;
 675         *buf++ = nsect;
 676         *buf++ = feature;
 677         *buf++ = sectors;
 678         return ide_do_drive_cmd(drive, &rq, ide_wait);
 679 }
 680
 681 int ide_cmd_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 682 {
 683         int err = 0;
 684         u8 args[4], *argbuf = args;
 685         u8 xfer_rate = 0;
 686         int argsize = 4;
 687         ide_task_t tfargs;
 688
 689         if (NULL == (void *) arg) {
 690                 struct request rq;
 691                 ide_init_drive_cmd(&rq);
 692                 return ide_do_drive_cmd(drive, &rq, ide_wait);
 693         }
 694
 695         if (copy_from_user(args, (void __user *)arg, 4))
 696                 return -EFAULT;
 697
 698         memset(&tfargs, 0, sizeof(ide_task_t));
 699         tfargs.tfRegister[IDE_FEATURE_OFFSET] = args[2];
 700         tfargs.tfRegister[IDE_NSECTOR_OFFSET] = args[3];
 701         tfargs.tfRegister[IDE_SECTOR_OFFSET]  = args[1];
 702         tfargs.tfRegister[IDE_LCYL_OFFSET]    = 0x00;
 703         tfargs.tfRegister[IDE_HCYL_OFFSET]    = 0x00;
 704         tfargs.tfRegister[IDE_SELECT_OFFSET]  = 0x00;
 705         tfargs.tfRegister[IDE_COMMAND_OFFSET] = args[0];
 706
 707         if (args[3]) {
 708                 argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
 709                 argbuf = kzalloc(argsize, GFP_KERNEL);
 710                 if (argbuf == NULL)
 711                         return -ENOMEM;
 712         }
 713         if (set_transfer(drive, &tfargs)) {
 714                 xfer_rate = args[1];
 715                 if (ide_ata66_check(drive, &tfargs))
 716                         goto abort;
 717         }
 718
 719         err = ide_wait_cmd(drive, args[0], args[1], args[2], args[3], argbuf);
 720
 721         if (!err && xfer_rate) {
 722                 /* active-retuning-calls future */
 723                 ide_set_xfer_rate(drive, xfer_rate);
 724                 ide_driveid_update(drive);
 725         }
 726 abort:
 727         if (copy_to_user((void __user *)arg, argbuf, argsize))
 728                 err = -EFAULT;
 729         if (argsize > 4)
 730                 kfree(argbuf);
 731         return err;
 732 }
 733
 734 static int ide_wait_cmd_task(ide_drive_t *drive, u8 *buf)
 735 {
 736         struct request rq;
 737
 738         ide_init_drive_cmd(&rq);
 739         rq.cmd_type = REQ_TYPE_ATA_TASK;
 740         rq.buffer = buf;
 741         return ide_do_drive_cmd(drive, &rq, ide_wait);
 742 }
 743
 744 int ide_task_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 745 {
 746         void __user *p = (void __user *)arg;
 747         int err = 0;
 748         u8 args[7], *argbuf = args;
 749         int argsize = 7;
 750
 751         if (copy_from_user(args, p, 7))
 752                 return -EFAULT;
 753         err = ide_wait_cmd_task(drive, argbuf);
 754         if (copy_to_user(p, argbuf, argsize))
 755                 err = -EFAULT;
 756         return err;
 757 }
 758
 759 /*
 760  * NOTICE: This is additions from IBM to provide a discrete interface,
 761  * for selective taskregister access operations.  Nice JOB Klaus!!!
 762  * Glad to be able to work and co-develop this with you and IBM.
 763  */
 764 ide_startstop_t flagged_taskfile (ide_drive_t *drive, ide_task_t *task)
 765 {
 766         ide_hwif_t *hwif        = HWIF(drive);
 767         task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
 768         hob_struct_t *hobfile   = (hob_struct_t *) task->hobRegister;
 769
 770         if (task->data_phase == TASKFILE_MULTI_IN ||
 771             task->data_phase == TASKFILE_MULTI_OUT) {
 772                 if (!drive->mult_count) {
 773                         printk(KERN_ERR "%s: multimode not set!\n", drive->name);
 774                         return ide_stopped;
 775                 }
 776         }
 777
 778         /*
 779          * (ks) Check taskfile in flags.
 780          * If set, then execute as it is defined.
 781          * If not set, then define default settings.
 782          * The default values are:
 783          *      read all taskfile registers (except data)
 784          *      read the hob registers (sector, nsector, lcyl, hcyl)
 785          */
 786         if (task->tf_in_flags.all == 0) {
 787                 task->tf_in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
 788                 if (drive->addressing == 1)
 789                         task->tf_in_flags.all |= (IDE_HOB_STD_IN_FLAGS  << 8);
 790         }
 791
 792         /* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
 793         if (IDE_CONTROL_REG)
 794                 /* clear nIEN */
 795                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 796         SELECT_MASK(drive, 0);
 797
 798         if (task->tf_out_flags.b.data) {
 799                 u16 data =  taskfile->data + (hobfile->data << 8);
 800                 hwif->OUTW(data, IDE_DATA_REG);
 801         }
 802
 803         /* (ks) send hob registers first */
 804         if (task->tf_out_flags.b.nsector_hob)
 805                 hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
 806         if (task->tf_out_flags.b.sector_hob)
 807                 hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
 808         if (task->tf_out_flags.b.lcyl_hob)
 809                 hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
 810         if (task->tf_out_flags.b.hcyl_hob)
 811                 hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
 812
 813         /* (ks) Send now the standard registers */
 814         if (task->tf_out_flags.b.error_feature)
 815                 hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
 816         /* refers to number of sectors to transfer */
 817         if (task->tf_out_flags.b.nsector)
 818                 hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
 819         /* refers to sector offset or start sector */
 820         if (task->tf_out_flags.b.sector)
 821                 hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
 822         if (task->tf_out_flags.b.lcyl)
 823                 hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
 824         if (task->tf_out_flags.b.hcyl)
 825                 hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
 826
 827         /*
 828          * (ks) In the flagged taskfile approch, we will use all specified
 829          * registers and the register value will not be changed, except the
 830          * select bit (master/slave) in the drive_head register. We must make
 831          * sure that the desired drive is selected.
 832          */
 833         hwif->OUTB(taskfile->device_head | drive->select.all, IDE_SELECT_REG);
 834         switch(task->data_phase) {
 835
 836                 case TASKFILE_OUT_DMAQ:
 837                 case TASKFILE_OUT_DMA:
 838                 case TASKFILE_IN_DMAQ:
 839                 case TASKFILE_IN_DMA:
 840                         if (!drive->using_dma)
 841                                 break;
 842
 843                         if (!hwif->dma_setup(drive)) {
 844                                 hwif->dma_exec_cmd(drive, taskfile->command);
 845                                 hwif->dma_start(drive);
 846                                 return ide_started;
 847                         }
 848                         break;
 849
 850                 default:
 851                         if (task->handler == NULL)
 852                                 return ide_stopped;
 853
 854                         /* Issue the command */
 855                         if (task->prehandler) {
 856                                 hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
 857                                 ndelay(400);    /* FIXME */
 858                                 return task->prehandler(drive, task->rq);
 859                         }
 860                         ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
 861                         return ide_started;
 862         }
 863
 864         return ide_stopped;
 865 }