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/sched.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/major.h>
  40 #include <linux/errno.h>
  41 #include <linux/genhd.h>
  42 #include <linux/blkpg.h>
  43 #include <linux/slab.h>
  44 #include <linux/pci.h>
  45 #include <linux/delay.h>
  46 #include <linux/hdreg.h>
  47 #include <linux/ide.h>
  48 #include <linux/bitops.h>
  49
  50 #include <asm/byteorder.h>
  51 #include <asm/irq.h>
  52 #include <asm/uaccess.h>
  53 #include <asm/io.h>
  54
  55 static void ata_bswap_data (void *buffer, int wcount)
  56 {
  57         u16 *p = buffer;
  58
  59         while (wcount--) {
  60                 *p = *p << 8 | *p >> 8; p++;
  61                 *p = *p << 8 | *p >> 8; p++;
  62         }
  63 }
  64
  65 static void taskfile_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
  66 {
  67         HWIF(drive)->ata_input_data(drive, buffer, wcount);
  68         if (drive->bswap)
  69                 ata_bswap_data(buffer, wcount);
  70 }
  71
  72 static void taskfile_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
  73 {
  74         if (drive->bswap) {
  75                 ata_bswap_data(buffer, wcount);
  76                 HWIF(drive)->ata_output_data(drive, buffer, wcount);
  77                 ata_bswap_data(buffer, wcount);
  78         } else {
  79                 HWIF(drive)->ata_output_data(drive, buffer, wcount);
  80         }
  81 }
  82
  83 int taskfile_lib_get_identify (ide_drive_t *drive, u8 *buf)
  84 {
  85         ide_task_t args;
  86         memset(&args, 0, sizeof(ide_task_t));
  87         args.tfRegister[IDE_NSECTOR_OFFSET]     = 0x01;
  88         if (drive->media == ide_disk)
  89                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_IDENTIFY;
  90         else
  91                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_PIDENTIFY;
  92         args.command_type = IDE_DRIVE_TASK_IN;
  93         args.data_phase   = TASKFILE_IN;
  94         args.handler      = &task_in_intr;
  95         return ide_raw_taskfile(drive, &args, buf);
  96 }
  97
  98 ide_startstop_t do_rw_taskfile (ide_drive_t *drive, ide_task_t *task)
  99 {
 100         ide_hwif_t *hwif        = HWIF(drive);
 101         task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
 102         hob_struct_t *hobfile   = (hob_struct_t *) task->hobRegister;
 103         u8 HIHI                 = (drive->addressing == 1) ? 0xE0 : 0xEF;
 104
 105         /* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
 106         if (IDE_CONTROL_REG) {
 107                 /* clear nIEN */
 108                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 109         }
 110         SELECT_MASK(drive, 0);
 111
 112         if (drive->addressing == 1) {
 113                 hwif->OUTB(hobfile->feature, IDE_FEATURE_REG);
 114                 hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
 115                 hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
 116                 hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
 117                 hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
 118         }
 119
 120         hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
 121         hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
 122         hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
 123         hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
 124         hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
 125
 126         hwif->OUTB((taskfile->device_head & HIHI) | drive->select.all, IDE_SELECT_REG);
 127
 128         if (task->handler != NULL) {
 129                 if (task->prehandler != NULL) {
 130                         hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
 131                         ndelay(400);    /* FIXME */
 132                         return task->prehandler(drive, task->rq);
 133                 }
 134                 ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
 135                 return ide_started;
 136         }
 137
 138         if (!drive->using_dma)
 139                 return ide_stopped;
 140
 141         switch (taskfile->command) {
 142                 case WIN_WRITEDMA_ONCE:
 143                 case WIN_WRITEDMA:
 144                 case WIN_WRITEDMA_EXT:
 145                 case WIN_READDMA_ONCE:
 146                 case WIN_READDMA:
 147                 case WIN_READDMA_EXT:
 148                 case WIN_IDENTIFY_DMA:
 149                         if (!hwif->dma_setup(drive)) {
 150                                 hwif->dma_exec_cmd(drive, taskfile->command);
 151                                 hwif->dma_start(drive);
 152                                 return ide_started;
 153                         }
 154                         break;
 155                 default:
 156                         if (task->handler == NULL)
 157                                 return ide_stopped;
 158         }
 159
 160         return ide_stopped;
 161 }
 162
 163 /*
 164  * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
 165  */
 166 ide_startstop_t set_multmode_intr (ide_drive_t *drive)
 167 {
 168         ide_hwif_t *hwif = HWIF(drive);
 169         u8 stat;
 170
 171         if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
 172                 drive->mult_count = drive->mult_req;
 173         } else {
 174                 drive->mult_req = drive->mult_count = 0;
 175                 drive->special.b.recalibrate = 1;
 176                 (void) ide_dump_status(drive, "set_multmode", stat);
 177         }
 178         return ide_stopped;
 179 }
 180
 181 /*
 182  * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
 183  */
 184 ide_startstop_t set_geometry_intr (ide_drive_t *drive)
 185 {
 186         ide_hwif_t *hwif = HWIF(drive);
 187         int retries = 5;
 188         u8 stat;
 189
 190         while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
 191                 udelay(10);
 192
 193         if (OK_STAT(stat, READY_STAT, BAD_STAT))
 194                 return ide_stopped;
 195
 196         if (stat & (ERR_STAT|DRQ_STAT))
 197                 return ide_error(drive, "set_geometry_intr", stat);
 198
 199         if (HWGROUP(drive)->handler != NULL)
 200                 BUG();
 201         ide_set_handler(drive, &set_geometry_intr, WAIT_WORSTCASE, NULL);
 202         return ide_started;
 203 }
 204
 205 /*
 206  * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
 207  */
 208 ide_startstop_t recal_intr (ide_drive_t *drive)
 209 {
 210         ide_hwif_t *hwif = HWIF(drive);
 211         u8 stat;
 212
 213         if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG), READY_STAT, BAD_STAT))
 214                 return ide_error(drive, "recal_intr", stat);
 215         return ide_stopped;
 216 }
 217
 218 /*
 219  * Handler for commands without a data phase
 220  */
 221 ide_startstop_t task_no_data_intr (ide_drive_t *drive)
 222 {
 223         ide_task_t *args        = HWGROUP(drive)->rq->special;
 224         ide_hwif_t *hwif        = HWIF(drive);
 225         u8 stat;
 226
 227         local_irq_enable();
 228         if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
 229                 return ide_error(drive, "task_no_data_intr", stat);
 230                 /* calls ide_end_drive_cmd */
 231         }
 232         if (args)
 233                 ide_end_drive_cmd(drive, stat, hwif->INB(IDE_ERROR_REG));
 234
 235         return ide_stopped;
 236 }
 237
 238 EXPORT_SYMBOL(task_no_data_intr);
 239
 240 static u8 wait_drive_not_busy(ide_drive_t *drive)
 241 {
 242         ide_hwif_t *hwif = HWIF(drive);
 243         int retries = 100;
 244         u8 stat;
 245
 246         /*
 247          * Last sector was transfered, wait until drive is ready.
 248          * This can take up to 10 usec, but we will wait max 1 ms
 249          * (drive_cmd_intr() waits that long).
 250          */
 251         while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
 252                 udelay(10);
 253
 254         if (!retries)
 255                 printk(KERN_ERR "%s: drive still BUSY!\n", drive->name);
 256
 257         return stat;
 258 }
 259
 260 static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
 261 {
 262         ide_hwif_t *hwif = drive->hwif;
 263         struct scatterlist *sg = hwif->sg_table;
 264         struct page *page;
 265 #ifdef CONFIG_HIGHMEM
 266         unsigned long flags;
 267 #endif
 268         unsigned int offset;
 269         u8 *buf;
 270
 271         page = sg[hwif->cursg].page;
 272         offset = sg[hwif->cursg].offset + hwif->cursg_ofs * SECTOR_SIZE;
 273
 274         /* get the current page and offset */
 275         page = nth_page(page, (offset >> PAGE_SHIFT));
 276         offset %= PAGE_SIZE;
 277
 278 #ifdef CONFIG_HIGHMEM
 279         local_irq_save(flags);
 280 #endif
 281         buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
 282
 283         hwif->nleft--;
 284         hwif->cursg_ofs++;
 285
 286         if ((hwif->cursg_ofs * SECTOR_SIZE) == sg[hwif->cursg].length) {
 287                 hwif->cursg++;
 288                 hwif->cursg_ofs = 0;
 289         }
 290
 291         /* do the actual data transfer */
 292         if (write)
 293                 taskfile_output_data(drive, buf, SECTOR_WORDS);
 294         else
 295                 taskfile_input_data(drive, buf, SECTOR_WORDS);
 296
 297         kunmap_atomic(buf, KM_BIO_SRC_IRQ);
 298 #ifdef CONFIG_HIGHMEM
 299         local_irq_restore(flags);
 300 #endif
 301 }
 302
 303 static void ide_pio_multi(ide_drive_t *drive, unsigned int write)
 304 {
 305         unsigned int nsect;
 306
 307         nsect = min_t(unsigned int, drive->hwif->nleft, drive->mult_count);
 308         while (nsect--)
 309                 ide_pio_sector(drive, write);
 310 }
 311
 312 static void ide_pio_datablock(ide_drive_t *drive, struct request *rq,
 313                                      unsigned int write)
 314 {
 315         if (rq->bio)    /* fs request */
 316                 rq->errors = 0;
 317
 318         touch_softlockup_watchdog();
 319
 320         switch (drive->hwif->data_phase) {
 321         case TASKFILE_MULTI_IN:
 322         case TASKFILE_MULTI_OUT:
 323                 ide_pio_multi(drive, write);
 324                 break;
 325         default:
 326                 ide_pio_sector(drive, write);
 327                 break;
 328         }
 329 }
 330
 331 static ide_startstop_t task_error(ide_drive_t *drive, struct request *rq,
 332                                   const char *s, u8 stat)
 333 {
 334         if (rq->bio) {
 335                 ide_hwif_t *hwif = drive->hwif;
 336                 int sectors = hwif->nsect - hwif->nleft;
 337
 338                 switch (hwif->data_phase) {
 339                 case TASKFILE_IN:
 340                         if (hwif->nleft)
 341                                 break;
 342                         /* fall through */
 343                 case TASKFILE_OUT:
 344                         sectors--;
 345                         break;
 346                 case TASKFILE_MULTI_IN:
 347                         if (hwif->nleft)
 348                                 break;
 349                         /* fall through */
 350                 case TASKFILE_MULTI_OUT:
 351                         sectors -= drive->mult_count;
 352                 default:
 353                         break;
 354                 }
 355
 356                 if (sectors > 0) {
 357                         ide_driver_t *drv;
 358
 359                         drv = *(ide_driver_t **)rq->rq_disk->private_data;
 360                         drv->end_request(drive, 1, sectors);
 361                 }
 362         }
 363         return ide_error(drive, s, stat);
 364 }
 365
 366 static void task_end_request(ide_drive_t *drive, struct request *rq, u8 stat)
 367 {
 368         if (rq->flags & REQ_DRIVE_TASKFILE) {
 369                 ide_task_t *task = rq->special;
 370
 371                 if (task->tf_out_flags.all) {
 372                         u8 err = drive->hwif->INB(IDE_ERROR_REG);
 373                         ide_end_drive_cmd(drive, stat, err);
 374                         return;
 375                 }
 376         }
 377
 378         if (rq->rq_disk) {
 379                 ide_driver_t *drv;
 380
 381                 drv = *(ide_driver_t **)rq->rq_disk->private_data;;
 382                 drv->end_request(drive, 1, rq->hard_nr_sectors);
 383         } else
 384                 ide_end_request(drive, 1, rq->hard_nr_sectors);
 385 }
 386
 387 /*
 388  * Handler for command with PIO data-in phase (Read/Read Multiple).
 389  */
 390 ide_startstop_t task_in_intr (ide_drive_t *drive)
 391 {
 392         ide_hwif_t *hwif = drive->hwif;
 393         struct request *rq = HWGROUP(drive)->rq;
 394         u8 stat = hwif->INB(IDE_STATUS_REG);
 395
 396         /* new way for dealing with premature shared PCI interrupts */
 397         if (!OK_STAT(stat, DATA_READY, BAD_R_STAT)) {
 398                 if (stat & (ERR_STAT | DRQ_STAT))
 399                         return task_error(drive, rq, __FUNCTION__, stat);
 400                 /* No data yet, so wait for another IRQ. */
 401                 ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
 402                 return ide_started;
 403         }
 404
 405         ide_pio_datablock(drive, rq, 0);
 406
 407         /* If it was the last datablock check status and finish transfer. */
 408         if (!hwif->nleft) {
 409                 stat = wait_drive_not_busy(drive);
 410                 if (!OK_STAT(stat, 0, BAD_R_STAT))
 411                         return task_error(drive, rq, __FUNCTION__, stat);
 412                 task_end_request(drive, rq, stat);
 413                 return ide_stopped;
 414         }
 415
 416         /* Still data left to transfer. */
 417         ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
 418
 419         return ide_started;
 420 }
 421 EXPORT_SYMBOL(task_in_intr);
 422
 423 /*
 424  * Handler for command with PIO data-out phase (Write/Write Multiple).
 425  */
 426 static ide_startstop_t task_out_intr (ide_drive_t *drive)
 427 {
 428         ide_hwif_t *hwif = drive->hwif;
 429         struct request *rq = HWGROUP(drive)->rq;
 430         u8 stat = hwif->INB(IDE_STATUS_REG);
 431
 432         if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat))
 433                 return task_error(drive, rq, __FUNCTION__, stat);
 434
 435         /* Deal with unexpected ATA data phase. */
 436         if (((stat & DRQ_STAT) == 0) ^ !hwif->nleft)
 437                 return task_error(drive, rq, __FUNCTION__, stat);
 438
 439         if (!hwif->nleft) {
 440                 task_end_request(drive, rq, stat);
 441                 return ide_stopped;
 442         }
 443
 444         /* Still data left to transfer. */
 445         ide_pio_datablock(drive, rq, 1);
 446         ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
 447
 448         return ide_started;
 449 }
 450
 451 ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq)
 452 {
 453         ide_startstop_t startstop;
 454
 455         if (ide_wait_stat(&startstop, drive, DATA_READY,
 456                           drive->bad_wstat, WAIT_DRQ)) {
 457                 printk(KERN_ERR "%s: no DRQ after issuing %sWRITE%s\n",
 458                                 drive->name,
 459                                 drive->hwif->data_phase ? "MULT" : "",
 460                                 drive->addressing ? "_EXT" : "");
 461                 return startstop;
 462         }
 463
 464         if (!drive->unmask)
 465                 local_irq_disable();
 466
 467         ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
 468         ide_pio_datablock(drive, rq, 1);
 469
 470         return ide_started;
 471 }
 472 EXPORT_SYMBOL(pre_task_out_intr);
 473
 474 static int ide_diag_taskfile(ide_drive_t *drive, ide_task_t *args, unsigned long data_size, u8 *buf)
 475 {
 476         struct request rq;
 477
 478         memset(&rq, 0, sizeof(rq));
 479         rq.flags = REQ_DRIVE_TASKFILE;
 480         rq.buffer = buf;
 481
 482         /*
 483          * (ks) We transfer currently only whole sectors.
 484          * This is suffient for now.  But, it would be great,
 485          * if we would find a solution to transfer any size.
 486          * To support special commands like READ LONG.
 487          */
 488         if (args->command_type != IDE_DRIVE_TASK_NO_DATA) {
 489                 if (data_size == 0)
 490                         rq.nr_sectors = (args->hobRegister[IDE_NSECTOR_OFFSET] << 8) | args->tfRegister[IDE_NSECTOR_OFFSET];
 491                 else
 492                         rq.nr_sectors = data_size / SECTOR_SIZE;
 493
 494                 if (!rq.nr_sectors) {
 495                         printk(KERN_ERR "%s: in/out command without data\n",
 496                                         drive->name);
 497                         return -EFAULT;
 498                 }
 499
 500                 rq.hard_nr_sectors = rq.nr_sectors;
 501                 rq.hard_cur_sectors = rq.current_nr_sectors = rq.nr_sectors;
 502
 503                 if (args->command_type == IDE_DRIVE_TASK_RAW_WRITE)
 504                         rq.flags |= REQ_RW;
 505         }
 506
 507         rq.special = args;
 508         args->rq = &rq;
 509         return ide_do_drive_cmd(drive, &rq, ide_wait);
 510 }
 511
 512 int ide_raw_taskfile (ide_drive_t *drive, ide_task_t *args, u8 *buf)
 513 {
 514         return ide_diag_taskfile(drive, args, 0, buf);
 515 }
 516
 517 EXPORT_SYMBOL(ide_raw_taskfile);
 518
 519 int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 520 {
 521         ide_task_request_t      *req_task;
 522         ide_task_t              args;
 523         u8 *outbuf              = NULL;
 524         u8 *inbuf               = NULL;
 525         task_ioreg_t *argsptr   = args.tfRegister;
 526         task_ioreg_t *hobsptr   = args.hobRegister;
 527         int err                 = 0;
 528         int tasksize            = sizeof(struct ide_task_request_s);
 529         int taskin              = 0;
 530         int taskout             = 0;
 531         u8 io_32bit             = drive->io_32bit;
 532         char __user *buf = (char __user *)arg;
 533
 534 //      printk("IDE Taskfile ...\n");
 535
 536         req_task = kzalloc(tasksize, GFP_KERNEL);
 537         if (req_task == NULL) return -ENOMEM;
 538         if (copy_from_user(req_task, buf, tasksize)) {
 539                 kfree(req_task);
 540                 return -EFAULT;
 541         }
 542
 543         taskout = (int) req_task->out_size;
 544         taskin  = (int) req_task->in_size;
 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 /*
 682  * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
 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.flags = REQ_DRIVE_TASK;
 743         rq.buffer = buf;
 744         return ide_do_drive_cmd(drive, &rq, ide_wait);
 745 }
 746
 747 /*
 748  * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
 749  */
 750 int ide_task_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 751 {
 752         void __user *p = (void __user *)arg;
 753         int err = 0;
 754         u8 args[7], *argbuf = args;
 755         int argsize = 7;
 756
 757         if (copy_from_user(args, p, 7))
 758                 return -EFAULT;
 759         err = ide_wait_cmd_task(drive, argbuf);
 760         if (copy_to_user(p, argbuf, argsize))
 761                 err = -EFAULT;
 762         return err;
 763 }
 764
 765 /*
 766  * NOTICE: This is additions from IBM to provide a discrete interface,
 767  * for selective taskregister access operations.  Nice JOB Klaus!!!
 768  * Glad to be able to work and co-develop this with you and IBM.
 769  */
 770 ide_startstop_t flagged_taskfile (ide_drive_t *drive, ide_task_t *task)
 771 {
 772         ide_hwif_t *hwif        = HWIF(drive);
 773         task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
 774         hob_struct_t *hobfile   = (hob_struct_t *) task->hobRegister;
 775
 776         if (task->data_phase == TASKFILE_MULTI_IN ||
 777             task->data_phase == TASKFILE_MULTI_OUT) {
 778                 if (!drive->mult_count) {
 779                         printk(KERN_ERR "%s: multimode not set!\n", drive->name);
 780                         return ide_stopped;
 781                 }
 782         }
 783
 784         /*
 785          * (ks) Check taskfile in flags.
 786          * If set, then execute as it is defined.
 787          * If not set, then define default settings.
 788          * The default values are:
 789          *      read all taskfile registers (except data)
 790          *      read the hob registers (sector, nsector, lcyl, hcyl)
 791          */
 792         if (task->tf_in_flags.all == 0) {
 793                 task->tf_in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
 794                 if (drive->addressing == 1)
 795                         task->tf_in_flags.all |= (IDE_HOB_STD_IN_FLAGS  << 8);
 796         }
 797
 798         /* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
 799         if (IDE_CONTROL_REG)
 800                 /* clear nIEN */
 801                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 802         SELECT_MASK(drive, 0);
 803
 804         if (task->tf_out_flags.b.data) {
 805                 u16 data =  taskfile->data + (hobfile->data << 8);
 806                 hwif->OUTW(data, IDE_DATA_REG);
 807         }
 808
 809         /* (ks) send hob registers first */
 810         if (task->tf_out_flags.b.nsector_hob)
 811                 hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
 812         if (task->tf_out_flags.b.sector_hob)
 813                 hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
 814         if (task->tf_out_flags.b.lcyl_hob)
 815                 hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
 816         if (task->tf_out_flags.b.hcyl_hob)
 817                 hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
 818
 819         /* (ks) Send now the standard registers */
 820         if (task->tf_out_flags.b.error_feature)
 821                 hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
 822         /* refers to number of sectors to transfer */
 823         if (task->tf_out_flags.b.nsector)
 824                 hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
 825         /* refers to sector offset or start sector */
 826         if (task->tf_out_flags.b.sector)
 827                 hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
 828         if (task->tf_out_flags.b.lcyl)
 829                 hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
 830         if (task->tf_out_flags.b.hcyl)
 831                 hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
 832
 833         /*
 834          * (ks) In the flagged taskfile approch, we will use all specified
 835          * registers and the register value will not be changed, except the
 836          * select bit (master/slave) in the drive_head register. We must make
 837          * sure that the desired drive is selected.
 838          */
 839         hwif->OUTB(taskfile->device_head | drive->select.all, IDE_SELECT_REG);
 840         switch(task->data_phase) {
 841
 842                 case TASKFILE_OUT_DMAQ:
 843                 case TASKFILE_OUT_DMA:
 844                 case TASKFILE_IN_DMAQ:
 845                 case TASKFILE_IN_DMA:
 846                         hwif->dma_setup(drive);
 847                         hwif->dma_exec_cmd(drive, taskfile->command);
 848                         hwif->dma_start(drive);
 849                         break;
 850
 851                 default:
 852                         if (task->handler == NULL)
 853                                 return ide_stopped;
 854
 855                         /* Issue the command */
 856                         if (task->prehandler) {
 857                                 hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
 858                                 ndelay(400);    /* FIXME */
 859                                 return task->prehandler(drive, task->rq);
 860                         }
 861                         ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
 862         }
 863
 864         return ide_started;
 865 }