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/module.h>
  31 #include <linux/types.h>
  32 #include <linux/string.h>
  33 #include <linux/kernel.h>
  34 #include <linux/timer.h>
  35 #include <linux/mm.h>
  36 #include <linux/sched.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 #include <linux/scatterlist.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         BUG_ON(HWGROUP(drive)->handler != NULL);
 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_in_hardirq();
 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;
 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         for (retries = 0; retries < 100; retries++) {
 251                 if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT)
 252                         udelay(10);
 253                 else
 254                         break;
 255         }
 256
 257         if (stat & BUSY_STAT)
 258                 printk(KERN_ERR "%s: drive still BUSY!\n", drive->name);
 259
 260         return stat;
 261 }
 262
 263 static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
 264 {
 265         ide_hwif_t *hwif = drive->hwif;
 266         struct scatterlist *sg = hwif->sg_table;
 267         struct scatterlist *cursg = hwif->cursg;
 268         struct page *page;
 269 #ifdef CONFIG_HIGHMEM
 270         unsigned long flags;
 271 #endif
 272         unsigned int offset;
 273         u8 *buf;
 274
 275         cursg = hwif->cursg;
 276         if (!cursg) {
 277                 cursg = sg;
 278                 hwif->cursg = sg;
 279         }
 280
 281         page = cursg->page;
 282         offset = cursg->offset + hwif->cursg_ofs * SECTOR_SIZE;
 283
 284         /* get the current page and offset */
 285         page = nth_page(page, (offset >> PAGE_SHIFT));
 286         offset %= PAGE_SIZE;
 287
 288 #ifdef CONFIG_HIGHMEM
 289         local_irq_save(flags);
 290 #endif
 291         buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
 292
 293         hwif->nleft--;
 294         hwif->cursg_ofs++;
 295
 296         if ((hwif->cursg_ofs * SECTOR_SIZE) == cursg->length) {
 297                 hwif->cursg = sg_next(hwif->cursg);
 298                 hwif->cursg_ofs = 0;
 299         }
 300
 301         /* do the actual data transfer */
 302         if (write)
 303                 taskfile_output_data(drive, buf, SECTOR_WORDS);
 304         else
 305                 taskfile_input_data(drive, buf, SECTOR_WORDS);
 306
 307         kunmap_atomic(buf, KM_BIO_SRC_IRQ);
 308 #ifdef CONFIG_HIGHMEM
 309         local_irq_restore(flags);
 310 #endif
 311 }
 312
 313 static void ide_pio_multi(ide_drive_t *drive, unsigned int write)
 314 {
 315         unsigned int nsect;
 316
 317         nsect = min_t(unsigned int, drive->hwif->nleft, drive->mult_count);
 318         while (nsect--)
 319                 ide_pio_sector(drive, write);
 320 }
 321
 322 static void ide_pio_datablock(ide_drive_t *drive, struct request *rq,
 323                                      unsigned int write)
 324 {
 325         if (rq->bio)    /* fs request */
 326                 rq->errors = 0;
 327
 328         touch_softlockup_watchdog();
 329
 330         switch (drive->hwif->data_phase) {
 331         case TASKFILE_MULTI_IN:
 332         case TASKFILE_MULTI_OUT:
 333                 ide_pio_multi(drive, write);
 334                 break;
 335         default:
 336                 ide_pio_sector(drive, write);
 337                 break;
 338         }
 339 }
 340
 341 static ide_startstop_t task_error(ide_drive_t *drive, struct request *rq,
 342                                   const char *s, u8 stat)
 343 {
 344         if (rq->bio) {
 345                 ide_hwif_t *hwif = drive->hwif;
 346                 int sectors = hwif->nsect - hwif->nleft;
 347
 348                 switch (hwif->data_phase) {
 349                 case TASKFILE_IN:
 350                         if (hwif->nleft)
 351                                 break;
 352                         /* fall through */
 353                 case TASKFILE_OUT:
 354                         sectors--;
 355                         break;
 356                 case TASKFILE_MULTI_IN:
 357                         if (hwif->nleft)
 358                                 break;
 359                         /* fall through */
 360                 case TASKFILE_MULTI_OUT:
 361                         sectors -= drive->mult_count;
 362                 default:
 363                         break;
 364                 }
 365
 366                 if (sectors > 0) {
 367                         ide_driver_t *drv;
 368
 369                         drv = *(ide_driver_t **)rq->rq_disk->private_data;
 370                         drv->end_request(drive, 1, sectors);
 371                 }
 372         }
 373         return ide_error(drive, s, stat);
 374 }
 375
 376 static void task_end_request(ide_drive_t *drive, struct request *rq, u8 stat)
 377 {
 378         HWIF(drive)->cursg = NULL;
 379
 380         if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
 381                 ide_task_t *task = rq->special;
 382
 383                 if (task->tf_out_flags.all) {
 384                         u8 err = drive->hwif->INB(IDE_ERROR_REG);
 385                         ide_end_drive_cmd(drive, stat, err);
 386                         return;
 387                 }
 388         }
 389
 390         if (rq->rq_disk) {
 391                 ide_driver_t *drv;
 392
 393                 drv = *(ide_driver_t **)rq->rq_disk->private_data;;
 394                 drv->end_request(drive, 1, rq->hard_nr_sectors);
 395         } else
 396                 ide_end_request(drive, 1, rq->hard_nr_sectors);
 397 }
 398
 399 /*
 400  * Handler for command with PIO data-in phase (Read/Read Multiple).
 401  */
 402 ide_startstop_t task_in_intr (ide_drive_t *drive)
 403 {
 404         ide_hwif_t *hwif = drive->hwif;
 405         struct request *rq = HWGROUP(drive)->rq;
 406         u8 stat = hwif->INB(IDE_STATUS_REG);
 407
 408         /* new way for dealing with premature shared PCI interrupts */
 409         if (!OK_STAT(stat, DATA_READY, BAD_R_STAT)) {
 410                 if (stat & (ERR_STAT | DRQ_STAT))
 411                         return task_error(drive, rq, __FUNCTION__, stat);
 412                 /* No data yet, so wait for another IRQ. */
 413                 ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
 414                 return ide_started;
 415         }
 416
 417         ide_pio_datablock(drive, rq, 0);
 418
 419         /* If it was the last datablock check status and finish transfer. */
 420         if (!hwif->nleft) {
 421                 stat = wait_drive_not_busy(drive);
 422                 if (!OK_STAT(stat, 0, BAD_R_STAT))
 423                         return task_error(drive, rq, __FUNCTION__, stat);
 424                 task_end_request(drive, rq, stat);
 425                 return ide_stopped;
 426         }
 427
 428         /* Still data left to transfer. */
 429         ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
 430
 431         return ide_started;
 432 }
 433 EXPORT_SYMBOL(task_in_intr);
 434
 435 /*
 436  * Handler for command with PIO data-out phase (Write/Write Multiple).
 437  */
 438 static ide_startstop_t task_out_intr (ide_drive_t *drive)
 439 {
 440         ide_hwif_t *hwif = drive->hwif;
 441         struct request *rq = HWGROUP(drive)->rq;
 442         u8 stat = hwif->INB(IDE_STATUS_REG);
 443
 444         if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat))
 445                 return task_error(drive, rq, __FUNCTION__, stat);
 446
 447         /* Deal with unexpected ATA data phase. */
 448         if (((stat & DRQ_STAT) == 0) ^ !hwif->nleft)
 449                 return task_error(drive, rq, __FUNCTION__, stat);
 450
 451         if (!hwif->nleft) {
 452                 task_end_request(drive, rq, stat);
 453                 return ide_stopped;
 454         }
 455
 456         /* Still data left to transfer. */
 457         ide_pio_datablock(drive, rq, 1);
 458         ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
 459
 460         return ide_started;
 461 }
 462
 463 ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq)
 464 {
 465         ide_startstop_t startstop;
 466
 467         if (ide_wait_stat(&startstop, drive, DATA_READY,
 468                           drive->bad_wstat, WAIT_DRQ)) {
 469                 printk(KERN_ERR "%s: no DRQ after issuing %sWRITE%s\n",
 470                                 drive->name,
 471                                 drive->hwif->data_phase ? "MULT" : "",
 472                                 drive->addressing ? "_EXT" : "");
 473                 return startstop;
 474         }
 475
 476         if (!drive->unmask)
 477                 local_irq_disable();
 478
 479         ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
 480         ide_pio_datablock(drive, rq, 1);
 481
 482         return ide_started;
 483 }
 484 EXPORT_SYMBOL(pre_task_out_intr);
 485
 486 static int ide_diag_taskfile(ide_drive_t *drive, ide_task_t *args, unsigned long data_size, u8 *buf)
 487 {
 488         struct request rq;
 489
 490         memset(&rq, 0, sizeof(rq));
 491         rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
 492         rq.buffer = buf;
 493
 494         /*
 495          * (ks) We transfer currently only whole sectors.
 496          * This is suffient for now.  But, it would be great,
 497          * if we would find a solution to transfer any size.
 498          * To support special commands like READ LONG.
 499          */
 500         if (args->command_type != IDE_DRIVE_TASK_NO_DATA) {
 501                 if (data_size == 0)
 502                         rq.nr_sectors = (args->hobRegister[IDE_NSECTOR_OFFSET] << 8) | args->tfRegister[IDE_NSECTOR_OFFSET];
 503                 else
 504                         rq.nr_sectors = data_size / SECTOR_SIZE;
 505
 506                 if (!rq.nr_sectors) {
 507                         printk(KERN_ERR "%s: in/out command without data\n",
 508                                         drive->name);
 509                         return -EFAULT;
 510                 }
 511
 512                 rq.hard_nr_sectors = rq.nr_sectors;
 513                 rq.hard_cur_sectors = rq.current_nr_sectors = rq.nr_sectors;
 514
 515                 if (args->command_type == IDE_DRIVE_TASK_RAW_WRITE)
 516                         rq.cmd_flags |= REQ_RW;
 517         }
 518
 519         rq.special = args;
 520         args->rq = &rq;
 521         return ide_do_drive_cmd(drive, &rq, ide_wait);
 522 }
 523
 524 int ide_raw_taskfile (ide_drive_t *drive, ide_task_t *args, u8 *buf)
 525 {
 526         return ide_diag_taskfile(drive, args, 0, buf);
 527 }
 528
 529 EXPORT_SYMBOL(ide_raw_taskfile);
 530
 531 int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 532 {
 533         ide_task_request_t      *req_task;
 534         ide_task_t              args;
 535         u8 *outbuf              = NULL;
 536         u8 *inbuf               = NULL;
 537         task_ioreg_t *argsptr   = args.tfRegister;
 538         task_ioreg_t *hobsptr   = args.hobRegister;
 539         int err                 = 0;
 540         int tasksize            = sizeof(struct ide_task_request_s);
 541         unsigned int taskin     = 0;
 542         unsigned int taskout    = 0;
 543         u8 io_32bit             = drive->io_32bit;
 544         char __user *buf = (char __user *)arg;
 545
 546 //      printk("IDE Taskfile ...\n");
 547
 548         req_task = kzalloc(tasksize, GFP_KERNEL);
 549         if (req_task == NULL) return -ENOMEM;
 550         if (copy_from_user(req_task, buf, tasksize)) {
 551                 kfree(req_task);
 552                 return -EFAULT;
 553         }
 554
 555         taskout = req_task->out_size;
 556         taskin  = req_task->in_size;
 557
 558         if (taskin > 65536 || taskout > 65536) {
 559                 err = -EINVAL;
 560                 goto abort;
 561         }
 562
 563         if (taskout) {
 564                 int outtotal = tasksize;
 565                 outbuf = kzalloc(taskout, GFP_KERNEL);
 566                 if (outbuf == NULL) {
 567                         err = -ENOMEM;
 568                         goto abort;
 569                 }
 570                 if (copy_from_user(outbuf, buf + outtotal, taskout)) {
 571                         err = -EFAULT;
 572                         goto abort;
 573                 }
 574         }
 575
 576         if (taskin) {
 577                 int intotal = tasksize + taskout;
 578                 inbuf = kzalloc(taskin, GFP_KERNEL);
 579                 if (inbuf == NULL) {
 580                         err = -ENOMEM;
 581                         goto abort;
 582                 }
 583                 if (copy_from_user(inbuf, buf + intotal, taskin)) {
 584                         err = -EFAULT;
 585                         goto abort;
 586                 }
 587         }
 588
 589         memset(&args, 0, sizeof(ide_task_t));
 590         memcpy(argsptr, req_task->io_ports, HDIO_DRIVE_TASK_HDR_SIZE);
 591         memcpy(hobsptr, req_task->hob_ports, HDIO_DRIVE_HOB_HDR_SIZE);
 592
 593         args.tf_in_flags  = req_task->in_flags;
 594         args.tf_out_flags = req_task->out_flags;
 595         args.data_phase   = req_task->data_phase;
 596         args.command_type = req_task->req_cmd;
 597
 598         drive->io_32bit = 0;
 599         switch(req_task->data_phase) {
 600                 case TASKFILE_OUT_DMAQ:
 601                 case TASKFILE_OUT_DMA:
 602                         err = ide_diag_taskfile(drive, &args, taskout, outbuf);
 603                         break;
 604                 case TASKFILE_IN_DMAQ:
 605                 case TASKFILE_IN_DMA:
 606                         err = ide_diag_taskfile(drive, &args, taskin, inbuf);
 607                         break;
 608                 case TASKFILE_MULTI_OUT:
 609                         if (!drive->mult_count) {
 610                                 /* (hs): give up if multcount is not set */
 611                                 printk(KERN_ERR "%s: %s Multimode Write " \
 612                                         "multcount is not set\n",
 613                                         drive->name, __FUNCTION__);
 614                                 err = -EPERM;
 615                                 goto abort;
 616                         }
 617                         /* fall through */
 618                 case TASKFILE_OUT:
 619                         args.prehandler = &pre_task_out_intr;
 620                         args.handler = &task_out_intr;
 621                         err = ide_diag_taskfile(drive, &args, taskout, outbuf);
 622                         break;
 623                 case TASKFILE_MULTI_IN:
 624                         if (!drive->mult_count) {
 625                                 /* (hs): give up if multcount is not set */
 626                                 printk(KERN_ERR "%s: %s Multimode Read failure " \
 627                                         "multcount is not set\n",
 628                                         drive->name, __FUNCTION__);
 629                                 err = -EPERM;
 630                                 goto abort;
 631                         }
 632                         /* fall through */
 633                 case TASKFILE_IN:
 634                         args.handler = &task_in_intr;
 635                         err = ide_diag_taskfile(drive, &args, taskin, inbuf);
 636                         break;
 637                 case TASKFILE_NO_DATA:
 638                         args.handler = &task_no_data_intr;
 639                         err = ide_diag_taskfile(drive, &args, 0, NULL);
 640                         break;
 641                 default:
 642                         err = -EFAULT;
 643                         goto abort;
 644         }
 645
 646         memcpy(req_task->io_ports, &(args.tfRegister), HDIO_DRIVE_TASK_HDR_SIZE);
 647         memcpy(req_task->hob_ports, &(args.hobRegister), HDIO_DRIVE_HOB_HDR_SIZE);
 648         req_task->in_flags  = args.tf_in_flags;
 649         req_task->out_flags = args.tf_out_flags;
 650
 651         if (copy_to_user(buf, req_task, tasksize)) {
 652                 err = -EFAULT;
 653                 goto abort;
 654         }
 655         if (taskout) {
 656                 int outtotal = tasksize;
 657                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
 658                         err = -EFAULT;
 659                         goto abort;
 660                 }
 661         }
 662         if (taskin) {
 663                 int intotal = tasksize + taskout;
 664                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
 665                         err = -EFAULT;
 666                         goto abort;
 667                 }
 668         }
 669 abort:
 670         kfree(req_task);
 671         kfree(outbuf);
 672         kfree(inbuf);
 673
 674 //      printk("IDE Taskfile ioctl ended. rc = %i\n", err);
 675
 676         drive->io_32bit = io_32bit;
 677
 678         return err;
 679 }
 680
 681 int ide_wait_cmd (ide_drive_t *drive, u8 cmd, u8 nsect, u8 feature, u8 sectors, u8 *buf)
 682 {
 683         struct request rq;
 684         u8 buffer[4];
 685
 686         if (!buf)
 687                 buf = buffer;
 688         memset(buf, 0, 4 + SECTOR_WORDS * 4 * sectors);
 689         ide_init_drive_cmd(&rq);
 690         rq.buffer = buf;
 691         *buf++ = cmd;
 692         *buf++ = nsect;
 693         *buf++ = feature;
 694         *buf++ = sectors;
 695         return ide_do_drive_cmd(drive, &rq, ide_wait);
 696 }
 697
 698 /*
 699  * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
 700  */
 701 int ide_cmd_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 702 {
 703         int err = 0;
 704         u8 args[4], *argbuf = args;
 705         u8 xfer_rate = 0;
 706         int argsize = 4;
 707         ide_task_t tfargs;
 708
 709         if (NULL == (void *) arg) {
 710                 struct request rq;
 711                 ide_init_drive_cmd(&rq);
 712                 return ide_do_drive_cmd(drive, &rq, ide_wait);
 713         }
 714
 715         if (copy_from_user(args, (void __user *)arg, 4))
 716                 return -EFAULT;
 717
 718         memset(&tfargs, 0, sizeof(ide_task_t));
 719         tfargs.tfRegister[IDE_FEATURE_OFFSET] = args[2];
 720         tfargs.tfRegister[IDE_NSECTOR_OFFSET] = args[3];
 721         tfargs.tfRegister[IDE_SECTOR_OFFSET]  = args[1];
 722         tfargs.tfRegister[IDE_LCYL_OFFSET]    = 0x00;
 723         tfargs.tfRegister[IDE_HCYL_OFFSET]    = 0x00;
 724         tfargs.tfRegister[IDE_SELECT_OFFSET]  = 0x00;
 725         tfargs.tfRegister[IDE_COMMAND_OFFSET] = args[0];
 726
 727         if (args[3]) {
 728                 argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
 729                 argbuf = kzalloc(argsize, GFP_KERNEL);
 730                 if (argbuf == NULL)
 731                         return -ENOMEM;
 732         }
 733         if (set_transfer(drive, &tfargs)) {
 734                 xfer_rate = args[1];
 735                 if (ide_ata66_check(drive, &tfargs))
 736                         goto abort;
 737         }
 738
 739         err = ide_wait_cmd(drive, args[0], args[1], args[2], args[3], argbuf);
 740
 741         if (!err && xfer_rate) {
 742                 /* active-retuning-calls future */
 743                 ide_set_xfer_rate(drive, xfer_rate);
 744                 ide_driveid_update(drive);
 745         }
 746 abort:
 747         if (copy_to_user((void __user *)arg, argbuf, argsize))
 748                 err = -EFAULT;
 749         if (argsize > 4)
 750                 kfree(argbuf);
 751         return err;
 752 }
 753
 754 static int ide_wait_cmd_task(ide_drive_t *drive, u8 *buf)
 755 {
 756         struct request rq;
 757
 758         ide_init_drive_cmd(&rq);
 759         rq.cmd_type = REQ_TYPE_ATA_TASK;
 760         rq.buffer = buf;
 761         return ide_do_drive_cmd(drive, &rq, ide_wait);
 762 }
 763
 764 /*
 765  * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
 766  */
 767 int ide_task_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 768 {
 769         void __user *p = (void __user *)arg;
 770         int err = 0;
 771         u8 args[7], *argbuf = args;
 772         int argsize = 7;
 773
 774         if (copy_from_user(args, p, 7))
 775                 return -EFAULT;
 776         err = ide_wait_cmd_task(drive, argbuf);
 777         if (copy_to_user(p, argbuf, argsize))
 778                 err = -EFAULT;
 779         return err;
 780 }
 781
 782 /*
 783  * NOTICE: This is additions from IBM to provide a discrete interface,
 784  * for selective taskregister access operations.  Nice JOB Klaus!!!
 785  * Glad to be able to work and co-develop this with you and IBM.
 786  */
 787 ide_startstop_t flagged_taskfile (ide_drive_t *drive, ide_task_t *task)
 788 {
 789         ide_hwif_t *hwif        = HWIF(drive);
 790         task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
 791         hob_struct_t *hobfile   = (hob_struct_t *) task->hobRegister;
 792
 793         if (task->data_phase == TASKFILE_MULTI_IN ||
 794             task->data_phase == TASKFILE_MULTI_OUT) {
 795                 if (!drive->mult_count) {
 796                         printk(KERN_ERR "%s: multimode not set!\n", drive->name);
 797                         return ide_stopped;
 798                 }
 799         }
 800
 801         /*
 802          * (ks) Check taskfile in flags.
 803          * If set, then execute as it is defined.
 804          * If not set, then define default settings.
 805          * The default values are:
 806          *      read all taskfile registers (except data)
 807          *      read the hob registers (sector, nsector, lcyl, hcyl)
 808          */
 809         if (task->tf_in_flags.all == 0) {
 810                 task->tf_in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
 811                 if (drive->addressing == 1)
 812                         task->tf_in_flags.all |= (IDE_HOB_STD_IN_FLAGS  << 8);
 813         }
 814
 815         /* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
 816         if (IDE_CONTROL_REG)
 817                 /* clear nIEN */
 818                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 819         SELECT_MASK(drive, 0);
 820
 821         if (task->tf_out_flags.b.data) {
 822                 u16 data =  taskfile->data + (hobfile->data << 8);
 823                 hwif->OUTW(data, IDE_DATA_REG);
 824         }
 825
 826         /* (ks) send hob registers first */
 827         if (task->tf_out_flags.b.nsector_hob)
 828                 hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
 829         if (task->tf_out_flags.b.sector_hob)
 830                 hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
 831         if (task->tf_out_flags.b.lcyl_hob)
 832                 hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
 833         if (task->tf_out_flags.b.hcyl_hob)
 834                 hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
 835
 836         /* (ks) Send now the standard registers */
 837         if (task->tf_out_flags.b.error_feature)
 838                 hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
 839         /* refers to number of sectors to transfer */
 840         if (task->tf_out_flags.b.nsector)
 841                 hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
 842         /* refers to sector offset or start sector */
 843         if (task->tf_out_flags.b.sector)
 844                 hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
 845         if (task->tf_out_flags.b.lcyl)
 846                 hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
 847         if (task->tf_out_flags.b.hcyl)
 848                 hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
 849
 850         /*
 851          * (ks) In the flagged taskfile approch, we will use all specified
 852          * registers and the register value will not be changed, except the
 853          * select bit (master/slave) in the drive_head register. We must make
 854          * sure that the desired drive is selected.
 855          */
 856         hwif->OUTB(taskfile->device_head | drive->select.all, IDE_SELECT_REG);
 857         switch(task->data_phase) {
 858
 859                 case TASKFILE_OUT_DMAQ:
 860                 case TASKFILE_OUT_DMA:
 861                 case TASKFILE_IN_DMAQ:
 862                 case TASKFILE_IN_DMA:
 863                         hwif->dma_setup(drive);
 864                         hwif->dma_exec_cmd(drive, taskfile->command);
 865                         hwif->dma_start(drive);
 866                         break;
 867
 868                 default:
 869                         if (task->handler == NULL)
 870                                 return ide_stopped;
 871
 872                         /* Issue the command */
 873                         if (task->prehandler) {
 874                                 hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
 875                                 ndelay(400);    /* FIXME */
 876                                 return task->prehandler(drive, task->rq);
 877                         }
 878                         ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
 879         }
 880
 881         return ide_started;
 882 }