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         ide_end_request(drive, 1, rq->hard_nr_sectors);
 379 }
 380
 381 /*
 382  * Handler for command with PIO data-in phase (Read/Read Multiple).
 383  */
 384 ide_startstop_t task_in_intr (ide_drive_t *drive)
 385 {
 386         ide_hwif_t *hwif = drive->hwif;
 387         struct request *rq = HWGROUP(drive)->rq;
 388         u8 stat = hwif->INB(IDE_STATUS_REG);
 389
 390         /* new way for dealing with premature shared PCI interrupts */
 391         if (!OK_STAT(stat, DATA_READY, BAD_R_STAT)) {
 392                 if (stat & (ERR_STAT | DRQ_STAT))
 393                         return task_error(drive, rq, __FUNCTION__, stat);
 394                 /* No data yet, so wait for another IRQ. */
 395                 ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
 396                 return ide_started;
 397         }
 398
 399         ide_pio_datablock(drive, rq, 0);
 400
 401         /* If it was the last datablock check status and finish transfer. */
 402         if (!hwif->nleft) {
 403                 stat = wait_drive_not_busy(drive);
 404                 if (!OK_STAT(stat, 0, BAD_R_STAT))
 405                         return task_error(drive, rq, __FUNCTION__, stat);
 406                 task_end_request(drive, rq, stat);
 407                 return ide_stopped;
 408         }
 409
 410         /* Still data left to transfer. */
 411         ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
 412
 413         return ide_started;
 414 }
 415 EXPORT_SYMBOL(task_in_intr);
 416
 417 /*
 418  * Handler for command with PIO data-out phase (Write/Write Multiple).
 419  */
 420 static ide_startstop_t task_out_intr (ide_drive_t *drive)
 421 {
 422         ide_hwif_t *hwif = drive->hwif;
 423         struct request *rq = HWGROUP(drive)->rq;
 424         u8 stat = hwif->INB(IDE_STATUS_REG);
 425
 426         if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat))
 427                 return task_error(drive, rq, __FUNCTION__, stat);
 428
 429         /* Deal with unexpected ATA data phase. */
 430         if (((stat & DRQ_STAT) == 0) ^ !hwif->nleft)
 431                 return task_error(drive, rq, __FUNCTION__, stat);
 432
 433         if (!hwif->nleft) {
 434                 task_end_request(drive, rq, stat);
 435                 return ide_stopped;
 436         }
 437
 438         /* Still data left to transfer. */
 439         ide_pio_datablock(drive, rq, 1);
 440         ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
 441
 442         return ide_started;
 443 }
 444
 445 ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq)
 446 {
 447         ide_startstop_t startstop;
 448
 449         if (ide_wait_stat(&startstop, drive, DATA_READY,
 450                           drive->bad_wstat, WAIT_DRQ)) {
 451                 printk(KERN_ERR "%s: no DRQ after issuing %sWRITE%s\n",
 452                                 drive->name,
 453                                 drive->hwif->data_phase ? "MULT" : "",
 454                                 drive->addressing ? "_EXT" : "");
 455                 return startstop;
 456         }
 457
 458         if (!drive->unmask)
 459                 local_irq_disable();
 460
 461         ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
 462         ide_pio_datablock(drive, rq, 1);
 463
 464         return ide_started;
 465 }
 466 EXPORT_SYMBOL(pre_task_out_intr);
 467
 468 static int ide_diag_taskfile(ide_drive_t *drive, ide_task_t *args, unsigned long data_size, u8 *buf)
 469 {
 470         struct request rq;
 471
 472         memset(&rq, 0, sizeof(rq));
 473         rq.flags = REQ_DRIVE_TASKFILE;
 474         rq.buffer = buf;
 475
 476         /*
 477          * (ks) We transfer currently only whole sectors.
 478          * This is suffient for now.  But, it would be great,
 479          * if we would find a solution to transfer any size.
 480          * To support special commands like READ LONG.
 481          */
 482         if (args->command_type != IDE_DRIVE_TASK_NO_DATA) {
 483                 if (data_size == 0)
 484                         rq.nr_sectors = (args->hobRegister[IDE_NSECTOR_OFFSET] << 8) | args->tfRegister[IDE_NSECTOR_OFFSET];
 485                 else
 486                         rq.nr_sectors = data_size / SECTOR_SIZE;
 487
 488                 if (!rq.nr_sectors) {
 489                         printk(KERN_ERR "%s: in/out command without data\n",
 490                                         drive->name);
 491                         return -EFAULT;
 492                 }
 493
 494                 rq.hard_nr_sectors = rq.nr_sectors;
 495                 rq.hard_cur_sectors = rq.current_nr_sectors = rq.nr_sectors;
 496
 497                 if (args->command_type == IDE_DRIVE_TASK_RAW_WRITE)
 498                         rq.flags |= REQ_RW;
 499         }
 500
 501         rq.special = args;
 502         args->rq = &rq;
 503         return ide_do_drive_cmd(drive, &rq, ide_wait);
 504 }
 505
 506 int ide_raw_taskfile (ide_drive_t *drive, ide_task_t *args, u8 *buf)
 507 {
 508         return ide_diag_taskfile(drive, args, 0, buf);
 509 }
 510
 511 EXPORT_SYMBOL(ide_raw_taskfile);
 512
 513 int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 514 {
 515         ide_task_request_t      *req_task;
 516         ide_task_t              args;
 517         u8 *outbuf              = NULL;
 518         u8 *inbuf               = NULL;
 519         task_ioreg_t *argsptr   = args.tfRegister;
 520         task_ioreg_t *hobsptr   = args.hobRegister;
 521         int err                 = 0;
 522         int tasksize            = sizeof(struct ide_task_request_s);
 523         int taskin              = 0;
 524         int taskout             = 0;
 525         u8 io_32bit             = drive->io_32bit;
 526         char __user *buf = (char __user *)arg;
 527
 528 //      printk("IDE Taskfile ...\n");
 529
 530         req_task = kzalloc(tasksize, GFP_KERNEL);
 531         if (req_task == NULL) return -ENOMEM;
 532         if (copy_from_user(req_task, buf, tasksize)) {
 533                 kfree(req_task);
 534                 return -EFAULT;
 535         }
 536
 537         taskout = (int) req_task->out_size;
 538         taskin  = (int) req_task->in_size;
 539
 540         if (taskout) {
 541                 int outtotal = tasksize;
 542                 outbuf = kzalloc(taskout, GFP_KERNEL);
 543                 if (outbuf == NULL) {
 544                         err = -ENOMEM;
 545                         goto abort;
 546                 }
 547                 if (copy_from_user(outbuf, buf + outtotal, taskout)) {
 548                         err = -EFAULT;
 549                         goto abort;
 550                 }
 551         }
 552
 553         if (taskin) {
 554                 int intotal = tasksize + taskout;
 555                 inbuf = kzalloc(taskin, GFP_KERNEL);
 556                 if (inbuf == NULL) {
 557                         err = -ENOMEM;
 558                         goto abort;
 559                 }
 560                 if (copy_from_user(inbuf, buf + intotal, taskin)) {
 561                         err = -EFAULT;
 562                         goto abort;
 563                 }
 564         }
 565
 566         memset(&args, 0, sizeof(ide_task_t));
 567         memcpy(argsptr, req_task->io_ports, HDIO_DRIVE_TASK_HDR_SIZE);
 568         memcpy(hobsptr, req_task->hob_ports, HDIO_DRIVE_HOB_HDR_SIZE);
 569
 570         args.tf_in_flags  = req_task->in_flags;
 571         args.tf_out_flags = req_task->out_flags;
 572         args.data_phase   = req_task->data_phase;
 573         args.command_type = req_task->req_cmd;
 574
 575         drive->io_32bit = 0;
 576         switch(req_task->data_phase) {
 577                 case TASKFILE_OUT_DMAQ:
 578                 case TASKFILE_OUT_DMA:
 579                         err = ide_diag_taskfile(drive, &args, taskout, outbuf);
 580                         break;
 581                 case TASKFILE_IN_DMAQ:
 582                 case TASKFILE_IN_DMA:
 583                         err = ide_diag_taskfile(drive, &args, taskin, inbuf);
 584                         break;
 585                 case TASKFILE_MULTI_OUT:
 586                         if (!drive->mult_count) {
 587                                 /* (hs): give up if multcount is not set */
 588                                 printk(KERN_ERR "%s: %s Multimode Write " \
 589                                         "multcount is not set\n",
 590                                         drive->name, __FUNCTION__);
 591                                 err = -EPERM;
 592                                 goto abort;
 593                         }
 594                         /* fall through */
 595                 case TASKFILE_OUT:
 596                         args.prehandler = &pre_task_out_intr;
 597                         args.handler = &task_out_intr;
 598                         err = ide_diag_taskfile(drive, &args, taskout, outbuf);
 599                         break;
 600                 case TASKFILE_MULTI_IN:
 601                         if (!drive->mult_count) {
 602                                 /* (hs): give up if multcount is not set */
 603                                 printk(KERN_ERR "%s: %s Multimode Read failure " \
 604                                         "multcount is not set\n",
 605                                         drive->name, __FUNCTION__);
 606                                 err = -EPERM;
 607                                 goto abort;
 608                         }
 609                         /* fall through */
 610                 case TASKFILE_IN:
 611                         args.handler = &task_in_intr;
 612                         err = ide_diag_taskfile(drive, &args, taskin, inbuf);
 613                         break;
 614                 case TASKFILE_NO_DATA:
 615                         args.handler = &task_no_data_intr;
 616                         err = ide_diag_taskfile(drive, &args, 0, NULL);
 617                         break;
 618                 default:
 619                         err = -EFAULT;
 620                         goto abort;
 621         }
 622
 623         memcpy(req_task->io_ports, &(args.tfRegister), HDIO_DRIVE_TASK_HDR_SIZE);
 624         memcpy(req_task->hob_ports, &(args.hobRegister), HDIO_DRIVE_HOB_HDR_SIZE);
 625         req_task->in_flags  = args.tf_in_flags;
 626         req_task->out_flags = args.tf_out_flags;
 627
 628         if (copy_to_user(buf, req_task, tasksize)) {
 629                 err = -EFAULT;
 630                 goto abort;
 631         }
 632         if (taskout) {
 633                 int outtotal = tasksize;
 634                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
 635                         err = -EFAULT;
 636                         goto abort;
 637                 }
 638         }
 639         if (taskin) {
 640                 int intotal = tasksize + taskout;
 641                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
 642                         err = -EFAULT;
 643                         goto abort;
 644                 }
 645         }
 646 abort:
 647         kfree(req_task);
 648         kfree(outbuf);
 649         kfree(inbuf);
 650
 651 //      printk("IDE Taskfile ioctl ended. rc = %i\n", err);
 652
 653         drive->io_32bit = io_32bit;
 654
 655         return err;
 656 }
 657
 658 int ide_wait_cmd (ide_drive_t *drive, u8 cmd, u8 nsect, u8 feature, u8 sectors, u8 *buf)
 659 {
 660         struct request rq;
 661         u8 buffer[4];
 662
 663         if (!buf)
 664                 buf = buffer;
 665         memset(buf, 0, 4 + SECTOR_WORDS * 4 * sectors);
 666         ide_init_drive_cmd(&rq);
 667         rq.buffer = buf;
 668         *buf++ = cmd;
 669         *buf++ = nsect;
 670         *buf++ = feature;
 671         *buf++ = sectors;
 672         return ide_do_drive_cmd(drive, &rq, ide_wait);
 673 }
 674
 675 /*
 676  * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
 677  */
 678 int ide_cmd_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 679 {
 680         int err = 0;
 681         u8 args[4], *argbuf = args;
 682         u8 xfer_rate = 0;
 683         int argsize = 4;
 684         ide_task_t tfargs;
 685
 686         if (NULL == (void *) arg) {
 687                 struct request rq;
 688                 ide_init_drive_cmd(&rq);
 689                 return ide_do_drive_cmd(drive, &rq, ide_wait);
 690         }
 691
 692         if (copy_from_user(args, (void __user *)arg, 4))
 693                 return -EFAULT;
 694
 695         memset(&tfargs, 0, sizeof(ide_task_t));
 696         tfargs.tfRegister[IDE_FEATURE_OFFSET] = args[2];
 697         tfargs.tfRegister[IDE_NSECTOR_OFFSET] = args[3];
 698         tfargs.tfRegister[IDE_SECTOR_OFFSET]  = args[1];
 699         tfargs.tfRegister[IDE_LCYL_OFFSET]    = 0x00;
 700         tfargs.tfRegister[IDE_HCYL_OFFSET]    = 0x00;
 701         tfargs.tfRegister[IDE_SELECT_OFFSET]  = 0x00;
 702         tfargs.tfRegister[IDE_COMMAND_OFFSET] = args[0];
 703
 704         if (args[3]) {
 705                 argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
 706                 argbuf = kzalloc(argsize, GFP_KERNEL);
 707                 if (argbuf == NULL)
 708                         return -ENOMEM;
 709         }
 710         if (set_transfer(drive, &tfargs)) {
 711                 xfer_rate = args[1];
 712                 if (ide_ata66_check(drive, &tfargs))
 713                         goto abort;
 714         }
 715
 716         err = ide_wait_cmd(drive, args[0], args[1], args[2], args[3], argbuf);
 717
 718         if (!err && xfer_rate) {
 719                 /* active-retuning-calls future */
 720                 ide_set_xfer_rate(drive, xfer_rate);
 721                 ide_driveid_update(drive);
 722         }
 723 abort:
 724         if (copy_to_user((void __user *)arg, argbuf, argsize))
 725                 err = -EFAULT;
 726         if (argsize > 4)
 727                 kfree(argbuf);
 728         return err;
 729 }
 730
 731 static int ide_wait_cmd_task(ide_drive_t *drive, u8 *buf)
 732 {
 733         struct request rq;
 734
 735         ide_init_drive_cmd(&rq);
 736         rq.flags = REQ_DRIVE_TASK;
 737         rq.buffer = buf;
 738         return ide_do_drive_cmd(drive, &rq, ide_wait);
 739 }
 740
 741 /*
 742  * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
 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                         hwif->dma_setup(drive);
 841                         hwif->dma_exec_cmd(drive, taskfile->command);
 842                         hwif->dma_start(drive);
 843                         break;
 844
 845                 default:
 846                         if (task->handler == NULL)
 847                                 return ide_stopped;
 848
 849                         /* Issue the command */
 850                         if (task->prehandler) {
 851                                 hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
 852                                 ndelay(400);    /* FIXME */
 853                                 return task->prehandler(drive, task->rq);
 854                         }
 855                         ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
 856         }
 857
 858         return ide_started;
 859 }