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