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
  49 #include <asm/byteorder.h>
  50 #include <asm/irq.h>
  51 #include <asm/uaccess.h>
  52 #include <asm/io.h>
  53
  54 static void ata_bswap_data (void *buffer, int wcount)
  55 {
  56         u16 *p = buffer;
  57
  58         while (wcount--) {
  59                 *p = *p << 8 | *p >> 8; p++;
  60                 *p = *p << 8 | *p >> 8; p++;
  61         }
  62 }
  63
  64 static void taskfile_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
  65 {
  66         HWIF(drive)->ata_input_data(drive, buffer, wcount);
  67         if (drive->bswap)
  68                 ata_bswap_data(buffer, wcount);
  69 }
  70
  71 static void taskfile_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
  72 {
  73         if (drive->bswap) {
  74                 ata_bswap_data(buffer, wcount);
  75                 HWIF(drive)->ata_output_data(drive, buffer, wcount);
  76                 ata_bswap_data(buffer, wcount);
  77         } else {
  78                 HWIF(drive)->ata_output_data(drive, buffer, wcount);
  79         }
  80 }
  81
  82 int taskfile_lib_get_identify (ide_drive_t *drive, u8 *buf)
  83 {
  84         ide_task_t args;
  85         memset(&args, 0, sizeof(ide_task_t));
  86         args.tfRegister[IDE_NSECTOR_OFFSET]     = 0x01;
  87         if (drive->media == ide_disk)
  88                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_IDENTIFY;
  89         else
  90                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_PIDENTIFY;
  91         args.command_type = IDE_DRIVE_TASK_IN;
  92         args.data_phase   = TASKFILE_IN;
  93         args.handler      = &task_in_intr;
  94         return ide_raw_taskfile(drive, &args, buf);
  95 }
  96
  97 ide_startstop_t do_rw_taskfile (ide_drive_t *drive, ide_task_t *task)
  98 {
  99         ide_hwif_t *hwif        = HWIF(drive);
 100         task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
 101         hob_struct_t *hobfile   = (hob_struct_t *) task->hobRegister;
 102         u8 HIHI                 = (drive->addressing == 1) ? 0xE0 : 0xEF;
 103
 104         /* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
 105         if (IDE_CONTROL_REG) {
 106                 /* clear nIEN */
 107                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 108         }
 109         SELECT_MASK(drive, 0);
 110
 111         if (drive->addressing == 1) {
 112                 hwif->OUTB(hobfile->feature, IDE_FEATURE_REG);
 113                 hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
 114                 hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
 115                 hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
 116                 hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
 117         }
 118
 119         hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
 120         hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
 121         hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
 122         hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
 123         hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
 124
 125         hwif->OUTB((taskfile->device_head & HIHI) | drive->select.all, IDE_SELECT_REG);
 126
 127         if (task->handler != NULL) {
 128                 if (task->prehandler != NULL) {
 129                         hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
 130                         ndelay(400);    /* FIXME */
 131                         return task->prehandler(drive, task->rq);
 132                 }
 133                 ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
 134                 return ide_started;
 135         }
 136
 137         if (!drive->using_dma)
 138                 return ide_stopped;
 139
 140         switch (taskfile->command) {
 141                 case WIN_WRITEDMA_ONCE:
 142                 case WIN_WRITEDMA:
 143                 case WIN_WRITEDMA_EXT:
 144                 case WIN_READDMA_ONCE:
 145                 case WIN_READDMA:
 146                 case WIN_READDMA_EXT:
 147                 case WIN_IDENTIFY_DMA:
 148                         if (!hwif->dma_setup(drive)) {
 149                                 hwif->dma_exec_cmd(drive, taskfile->command);
 150                                 hwif->dma_start(drive);
 151                                 return ide_started;
 152                         }
 153                         break;
 154                 default:
 155                         if (task->handler == NULL)
 156                                 return ide_stopped;
 157         }
 158
 159         return ide_stopped;
 160 }
 161
 162 /*
 163  * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
 164  */
 165 ide_startstop_t set_multmode_intr (ide_drive_t *drive)
 166 {
 167         ide_hwif_t *hwif = HWIF(drive);
 168         u8 stat;
 169
 170         if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
 171                 drive->mult_count = drive->mult_req;
 172         } else {
 173                 drive->mult_req = drive->mult_count = 0;
 174                 drive->special.b.recalibrate = 1;
 175                 (void) ide_dump_status(drive, "set_multmode", stat);
 176         }
 177         return ide_stopped;
 178 }
 179
 180 /*
 181  * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
 182  */
 183 ide_startstop_t set_geometry_intr (ide_drive_t *drive)
 184 {
 185         ide_hwif_t *hwif = HWIF(drive);
 186         int retries = 5;
 187         u8 stat;
 188
 189         while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
 190                 udelay(10);
 191
 192         if (OK_STAT(stat, READY_STAT, BAD_STAT))
 193                 return ide_stopped;
 194
 195         if (stat & (ERR_STAT|DRQ_STAT))
 196                 return ide_error(drive, "set_geometry_intr", stat);
 197
 198         BUG_ON(HWGROUP(drive)->handler != NULL);
 199         ide_set_handler(drive, &set_geometry_intr, WAIT_WORSTCASE, NULL);
 200         return ide_started;
 201 }
 202
 203 /*
 204  * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
 205  */
 206 ide_startstop_t recal_intr (ide_drive_t *drive)
 207 {
 208         ide_hwif_t *hwif = HWIF(drive);
 209         u8 stat;
 210
 211         if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG), READY_STAT, BAD_STAT))
 212                 return ide_error(drive, "recal_intr", stat);
 213         return ide_stopped;
 214 }
 215
 216 /*
 217  * Handler for commands without a data phase
 218  */
 219 ide_startstop_t task_no_data_intr (ide_drive_t *drive)
 220 {
 221         ide_task_t *args        = HWGROUP(drive)->rq->special;
 222         ide_hwif_t *hwif        = HWIF(drive);
 223         u8 stat;
 224
 225         local_irq_enable_in_hardirq();
 226         if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
 227                 return ide_error(drive, "task_no_data_intr", stat);
 228                 /* calls ide_end_drive_cmd */
 229         }
 230         if (args)
 231                 ide_end_drive_cmd(drive, stat, hwif->INB(IDE_ERROR_REG));
 232
 233         return ide_stopped;
 234 }
 235
 236 EXPORT_SYMBOL(task_no_data_intr);
 237
 238 static u8 wait_drive_not_busy(ide_drive_t *drive)
 239 {
 240         ide_hwif_t *hwif = HWIF(drive);
 241         int retries = 100;
 242         u8 stat;
 243
 244         /*
 245          * Last sector was transfered, wait until drive is ready.
 246          * This can take up to 10 usec, but we will wait max 1 ms
 247          * (drive_cmd_intr() waits that long).
 248          */
 249         while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
 250                 udelay(10);
 251
 252         if (!retries)
 253                 printk(KERN_ERR "%s: drive still BUSY!\n", drive->name);
 254
 255         return stat;
 256 }
 257
 258 static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
 259 {
 260         ide_hwif_t *hwif = drive->hwif;
 261         struct scatterlist *sg = hwif->sg_table;
 262         struct page *page;
 263 #ifdef CONFIG_HIGHMEM
 264         unsigned long flags;
 265 #endif
 266         unsigned int offset;
 267         u8 *buf;
 268
 269         page = sg[hwif->cursg].page;
 270         offset = sg[hwif->cursg].offset + hwif->cursg_ofs * SECTOR_SIZE;
 271
 272         /* get the current page and offset */
 273         page = nth_page(page, (offset >> PAGE_SHIFT));
 274         offset %= PAGE_SIZE;
 275
 276 #ifdef CONFIG_HIGHMEM
 277         local_irq_save(flags);
 278 #endif
 279         buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
 280
 281         hwif->nleft--;
 282         hwif->cursg_ofs++;
 283
 284         if ((hwif->cursg_ofs * SECTOR_SIZE) == sg[hwif->cursg].length) {
 285                 hwif->cursg++;
 286                 hwif->cursg_ofs = 0;
 287         }
 288
 289         /* do the actual data transfer */
 290         if (write)
 291                 taskfile_output_data(drive, buf, SECTOR_WORDS);
 292         else
 293                 taskfile_input_data(drive, buf, SECTOR_WORDS);
 294
 295         kunmap_atomic(buf, KM_BIO_SRC_IRQ);
 296 #ifdef CONFIG_HIGHMEM
 297         local_irq_restore(flags);
 298 #endif
 299 }
 300
 301 static void ide_pio_multi(ide_drive_t *drive, unsigned int write)
 302 {
 303         unsigned int nsect;
 304
 305         nsect = min_t(unsigned int, drive->hwif->nleft, drive->mult_count);
 306         while (nsect--)
 307                 ide_pio_sector(drive, write);
 308 }
 309
 310 static void ide_pio_datablock(ide_drive_t *drive, struct request *rq,
 311                                      unsigned int write)
 312 {
 313         if (rq->bio)    /* fs request */
 314                 rq->errors = 0;
 315
 316         touch_softlockup_watchdog();
 317
 318         switch (drive->hwif->data_phase) {
 319         case TASKFILE_MULTI_IN:
 320         case TASKFILE_MULTI_OUT:
 321                 ide_pio_multi(drive, write);
 322                 break;
 323         default:
 324                 ide_pio_sector(drive, write);
 325                 break;
 326         }
 327 }
 328
 329 static ide_startstop_t task_error(ide_drive_t *drive, struct request *rq,
 330                                   const char *s, u8 stat)
 331 {
 332         if (rq->bio) {
 333                 ide_hwif_t *hwif = drive->hwif;
 334                 int sectors = hwif->nsect - hwif->nleft;
 335
 336                 switch (hwif->data_phase) {
 337                 case TASKFILE_IN:
 338                         if (hwif->nleft)
 339                                 break;
 340                         /* fall through */
 341                 case TASKFILE_OUT:
 342                         sectors--;
 343                         break;
 344                 case TASKFILE_MULTI_IN:
 345                         if (hwif->nleft)
 346                                 break;
 347                         /* fall through */
 348                 case TASKFILE_MULTI_OUT:
 349                         sectors -= drive->mult_count;
 350                 default:
 351                         break;
 352                 }
 353
 354                 if (sectors > 0) {
 355                         ide_driver_t *drv;
 356
 357                         drv = *(ide_driver_t **)rq->rq_disk->private_data;
 358                         drv->end_request(drive, 1, sectors);
 359                 }
 360         }
 361         return ide_error(drive, s, stat);
 362 }
 363
 364 static void task_end_request(ide_drive_t *drive, struct request *rq, u8 stat)
 365 {
 366         if (rq->flags & REQ_DRIVE_TASKFILE) {
 367                 ide_task_t *task = rq->special;
 368
 369                 if (task->tf_out_flags.all) {
 370                         u8 err = drive->hwif->INB(IDE_ERROR_REG);
 371                         ide_end_drive_cmd(drive, stat, err);
 372                         return;
 373                 }
 374         }
 375
 376         if (rq->rq_disk) {
 377                 ide_driver_t *drv;
 378
 379                 drv = *(ide_driver_t **)rq->rq_disk->private_data;;
 380                 drv->end_request(drive, 1, rq->hard_nr_sectors);
 381         } else
 382                 ide_end_request(drive, 1, rq->hard_nr_sectors);
 383 }
 384
 385 /*
 386  * Handler for command with PIO data-in phase (Read/Read Multiple).
 387  */
 388 ide_startstop_t task_in_intr (ide_drive_t *drive)
 389 {
 390         ide_hwif_t *hwif = drive->hwif;
 391         struct request *rq = HWGROUP(drive)->rq;
 392         u8 stat = hwif->INB(IDE_STATUS_REG);
 393
 394         /* new way for dealing with premature shared PCI interrupts */
 395         if (!OK_STAT(stat, DATA_READY, BAD_R_STAT)) {
 396                 if (stat & (ERR_STAT | DRQ_STAT))
 397                         return task_error(drive, rq, __FUNCTION__, stat);
 398                 /* No data yet, so wait for another IRQ. */
 399                 ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
 400                 return ide_started;
 401         }
 402
 403         ide_pio_datablock(drive, rq, 0);
 404
 405         /* If it was the last datablock check status and finish transfer. */
 406         if (!hwif->nleft) {
 407                 stat = wait_drive_not_busy(drive);
 408                 if (!OK_STAT(stat, 0, BAD_R_STAT))
 409                         return task_error(drive, rq, __FUNCTION__, stat);
 410                 task_end_request(drive, rq, stat);
 411                 return ide_stopped;
 412         }
 413
 414         /* Still data left to transfer. */
 415         ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
 416
 417         return ide_started;
 418 }
 419 EXPORT_SYMBOL(task_in_intr);
 420
 421 /*
 422  * Handler for command with PIO data-out phase (Write/Write Multiple).
 423  */
 424 static ide_startstop_t task_out_intr (ide_drive_t *drive)
 425 {
 426         ide_hwif_t *hwif = drive->hwif;
 427         struct request *rq = HWGROUP(drive)->rq;
 428         u8 stat = hwif->INB(IDE_STATUS_REG);
 429
 430         if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat))
 431                 return task_error(drive, rq, __FUNCTION__, stat);
 432
 433         /* Deal with unexpected ATA data phase. */
 434         if (((stat & DRQ_STAT) == 0) ^ !hwif->nleft)
 435                 return task_error(drive, rq, __FUNCTION__, stat);
 436
 437         if (!hwif->nleft) {
 438                 task_end_request(drive, rq, stat);
 439                 return ide_stopped;
 440         }
 441
 442         /* Still data left to transfer. */
 443         ide_pio_datablock(drive, rq, 1);
 444         ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
 445
 446         return ide_started;
 447 }
 448
 449 ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq)
 450 {
 451         ide_startstop_t startstop;
 452
 453         if (ide_wait_stat(&startstop, drive, DATA_READY,
 454                           drive->bad_wstat, WAIT_DRQ)) {
 455                 printk(KERN_ERR "%s: no DRQ after issuing %sWRITE%s\n",
 456                                 drive->name,
 457                                 drive->hwif->data_phase ? "MULT" : "",
 458                                 drive->addressing ? "_EXT" : "");
 459                 return startstop;
 460         }
 461
 462         if (!drive->unmask)
 463                 local_irq_disable();
 464
 465         ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
 466         ide_pio_datablock(drive, rq, 1);
 467
 468         return ide_started;
 469 }
 470 EXPORT_SYMBOL(pre_task_out_intr);
 471
 472 static int ide_diag_taskfile(ide_drive_t *drive, ide_task_t *args, unsigned long data_size, u8 *buf)
 473 {
 474         struct request rq;
 475
 476         memset(&rq, 0, sizeof(rq));
 477         rq.flags = REQ_DRIVE_TASKFILE;
 478         rq.buffer = buf;
 479
 480         /*
 481          * (ks) We transfer currently only whole sectors.
 482          * This is suffient for now.  But, it would be great,
 483          * if we would find a solution to transfer any size.
 484          * To support special commands like READ LONG.
 485          */
 486         if (args->command_type != IDE_DRIVE_TASK_NO_DATA) {
 487                 if (data_size == 0)
 488                         rq.nr_sectors = (args->hobRegister[IDE_NSECTOR_OFFSET] << 8) | args->tfRegister[IDE_NSECTOR_OFFSET];
 489                 else
 490                         rq.nr_sectors = data_size / SECTOR_SIZE;
 491
 492                 if (!rq.nr_sectors) {
 493                         printk(KERN_ERR "%s: in/out command without data\n",
 494                                         drive->name);
 495                         return -EFAULT;
 496                 }
 497
 498                 rq.hard_nr_sectors = rq.nr_sectors;
 499                 rq.hard_cur_sectors = rq.current_nr_sectors = rq.nr_sectors;
 500
 501                 if (args->command_type == IDE_DRIVE_TASK_RAW_WRITE)
 502                         rq.flags |= REQ_RW;
 503         }
 504
 505         rq.special = args;
 506         args->rq = &rq;
 507         return ide_do_drive_cmd(drive, &rq, ide_wait);
 508 }
 509
 510 int ide_raw_taskfile (ide_drive_t *drive, ide_task_t *args, u8 *buf)
 511 {
 512         return ide_diag_taskfile(drive, args, 0, buf);
 513 }
 514
 515 EXPORT_SYMBOL(ide_raw_taskfile);
 516
 517 int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 518 {
 519         ide_task_request_t      *req_task;
 520         ide_task_t              args;
 521         u8 *outbuf              = NULL;
 522         u8 *inbuf               = NULL;
 523         task_ioreg_t *argsptr   = args.tfRegister;
 524         task_ioreg_t *hobsptr   = args.hobRegister;
 525         int err                 = 0;
 526         int tasksize            = sizeof(struct ide_task_request_s);
 527         int taskin              = 0;
 528         int taskout             = 0;
 529         u8 io_32bit             = drive->io_32bit;
 530         char __user *buf = (char __user *)arg;
 531
 532 //      printk("IDE Taskfile ...\n");
 533
 534         req_task = kzalloc(tasksize, GFP_KERNEL);
 535         if (req_task == NULL) return -ENOMEM;
 536         if (copy_from_user(req_task, buf, tasksize)) {
 537                 kfree(req_task);
 538                 return -EFAULT;
 539         }
 540
 541         taskout = (int) req_task->out_size;
 542         taskin  = (int) req_task->in_size;
 543
 544         if (taskout) {
 545                 int outtotal = tasksize;
 546                 outbuf = kzalloc(taskout, GFP_KERNEL);
 547                 if (outbuf == NULL) {
 548                         err = -ENOMEM;
 549                         goto abort;
 550                 }
 551                 if (copy_from_user(outbuf, buf + outtotal, taskout)) {
 552                         err = -EFAULT;
 553                         goto abort;
 554                 }
 555         }
 556
 557         if (taskin) {
 558                 int intotal = tasksize + taskout;
 559                 inbuf = kzalloc(taskin, GFP_KERNEL);
 560                 if (inbuf == NULL) {
 561                         err = -ENOMEM;
 562                         goto abort;
 563                 }
 564                 if (copy_from_user(inbuf, buf + intotal, taskin)) {
 565                         err = -EFAULT;
 566                         goto abort;
 567                 }
 568         }
 569
 570         memset(&args, 0, sizeof(ide_task_t));
 571         memcpy(argsptr, req_task->io_ports, HDIO_DRIVE_TASK_HDR_SIZE);
 572         memcpy(hobsptr, req_task->hob_ports, HDIO_DRIVE_HOB_HDR_SIZE);
 573
 574         args.tf_in_flags  = req_task->in_flags;
 575         args.tf_out_flags = req_task->out_flags;
 576         args.data_phase   = req_task->data_phase;
 577         args.command_type = req_task->req_cmd;
 578
 579         drive->io_32bit = 0;
 580         switch(req_task->data_phase) {
 581                 case TASKFILE_OUT_DMAQ:
 582                 case TASKFILE_OUT_DMA:
 583                         err = ide_diag_taskfile(drive, &args, taskout, outbuf);
 584                         break;
 585                 case TASKFILE_IN_DMAQ:
 586                 case TASKFILE_IN_DMA:
 587                         err = ide_diag_taskfile(drive, &args, taskin, inbuf);
 588                         break;
 589                 case TASKFILE_MULTI_OUT:
 590                         if (!drive->mult_count) {
 591                                 /* (hs): give up if multcount is not set */
 592                                 printk(KERN_ERR "%s: %s Multimode Write " \
 593                                         "multcount is not set\n",
 594                                         drive->name, __FUNCTION__);
 595                                 err = -EPERM;
 596                                 goto abort;
 597                         }
 598                         /* fall through */
 599                 case TASKFILE_OUT:
 600                         args.prehandler = &pre_task_out_intr;
 601                         args.handler = &task_out_intr;
 602                         err = ide_diag_taskfile(drive, &args, taskout, outbuf);
 603                         break;
 604                 case TASKFILE_MULTI_IN:
 605                         if (!drive->mult_count) {
 606                                 /* (hs): give up if multcount is not set */
 607                                 printk(KERN_ERR "%s: %s Multimode Read failure " \
 608                                         "multcount is not set\n",
 609                                         drive->name, __FUNCTION__);
 610                                 err = -EPERM;
 611                                 goto abort;
 612                         }
 613                         /* fall through */
 614                 case TASKFILE_IN:
 615                         args.handler = &task_in_intr;
 616                         err = ide_diag_taskfile(drive, &args, taskin, inbuf);
 617                         break;
 618                 case TASKFILE_NO_DATA:
 619                         args.handler = &task_no_data_intr;
 620                         err = ide_diag_taskfile(drive, &args, 0, NULL);
 621                         break;
 622                 default:
 623                         err = -EFAULT;
 624                         goto abort;
 625         }
 626
 627         memcpy(req_task->io_ports, &(args.tfRegister), HDIO_DRIVE_TASK_HDR_SIZE);
 628         memcpy(req_task->hob_ports, &(args.hobRegister), HDIO_DRIVE_HOB_HDR_SIZE);
 629         req_task->in_flags  = args.tf_in_flags;
 630         req_task->out_flags = args.tf_out_flags;
 631
 632         if (copy_to_user(buf, req_task, tasksize)) {
 633                 err = -EFAULT;
 634                 goto abort;
 635         }
 636         if (taskout) {
 637                 int outtotal = tasksize;
 638                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
 639                         err = -EFAULT;
 640                         goto abort;
 641                 }
 642         }
 643         if (taskin) {
 644                 int intotal = tasksize + taskout;
 645                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
 646                         err = -EFAULT;
 647                         goto abort;
 648                 }
 649         }
 650 abort:
 651         kfree(req_task);
 652         kfree(outbuf);
 653         kfree(inbuf);
 654
 655 //      printk("IDE Taskfile ioctl ended. rc = %i\n", err);
 656
 657         drive->io_32bit = io_32bit;
 658
 659         return err;
 660 }
 661
 662 int ide_wait_cmd (ide_drive_t *drive, u8 cmd, u8 nsect, u8 feature, u8 sectors, u8 *buf)
 663 {
 664         struct request rq;
 665         u8 buffer[4];
 666
 667         if (!buf)
 668                 buf = buffer;
 669         memset(buf, 0, 4 + SECTOR_WORDS * 4 * sectors);
 670         ide_init_drive_cmd(&rq);
 671         rq.buffer = buf;
 672         *buf++ = cmd;
 673         *buf++ = nsect;
 674         *buf++ = feature;
 675         *buf++ = sectors;
 676         return ide_do_drive_cmd(drive, &rq, ide_wait);
 677 }
 678
 679 /*
 680  * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
 681  */
 682 int ide_cmd_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 683 {
 684         int err = 0;
 685         u8 args[4], *argbuf = args;
 686         u8 xfer_rate = 0;
 687         int argsize = 4;
 688         ide_task_t tfargs;
 689
 690         if (NULL == (void *) arg) {
 691                 struct request rq;
 692                 ide_init_drive_cmd(&rq);
 693                 return ide_do_drive_cmd(drive, &rq, ide_wait);
 694         }
 695
 696         if (copy_from_user(args, (void __user *)arg, 4))
 697                 return -EFAULT;
 698
 699         memset(&tfargs, 0, sizeof(ide_task_t));
 700         tfargs.tfRegister[IDE_FEATURE_OFFSET] = args[2];
 701         tfargs.tfRegister[IDE_NSECTOR_OFFSET] = args[3];
 702         tfargs.tfRegister[IDE_SECTOR_OFFSET]  = args[1];
 703         tfargs.tfRegister[IDE_LCYL_OFFSET]    = 0x00;
 704         tfargs.tfRegister[IDE_HCYL_OFFSET]    = 0x00;
 705         tfargs.tfRegister[IDE_SELECT_OFFSET]  = 0x00;
 706         tfargs.tfRegister[IDE_COMMAND_OFFSET] = args[0];
 707
 708         if (args[3]) {
 709                 argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
 710                 argbuf = kzalloc(argsize, GFP_KERNEL);
 711                 if (argbuf == NULL)
 712                         return -ENOMEM;
 713         }
 714         if (set_transfer(drive, &tfargs)) {
 715                 xfer_rate = args[1];
 716                 if (ide_ata66_check(drive, &tfargs))
 717                         goto abort;
 718         }
 719
 720         err = ide_wait_cmd(drive, args[0], args[1], args[2], args[3], argbuf);
 721
 722         if (!err && xfer_rate) {
 723                 /* active-retuning-calls future */
 724                 ide_set_xfer_rate(drive, xfer_rate);
 725                 ide_driveid_update(drive);
 726         }
 727 abort:
 728         if (copy_to_user((void __user *)arg, argbuf, argsize))
 729                 err = -EFAULT;
 730         if (argsize > 4)
 731                 kfree(argbuf);
 732         return err;
 733 }
 734
 735 static int ide_wait_cmd_task(ide_drive_t *drive, u8 *buf)
 736 {
 737         struct request rq;
 738
 739         ide_init_drive_cmd(&rq);
 740         rq.flags = REQ_DRIVE_TASK;
 741         rq.buffer = buf;
 742         return ide_do_drive_cmd(drive, &rq, ide_wait);
 743 }
 744
 745 /*
 746  * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
 747  */
 748 int ide_task_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 749 {
 750         void __user *p = (void __user *)arg;
 751         int err = 0;
 752         u8 args[7], *argbuf = args;
 753         int argsize = 7;
 754
 755         if (copy_from_user(args, p, 7))
 756                 return -EFAULT;
 757         err = ide_wait_cmd_task(drive, argbuf);
 758         if (copy_to_user(p, argbuf, argsize))
 759                 err = -EFAULT;
 760         return err;
 761 }
 762
 763 /*
 764  * NOTICE: This is additions from IBM to provide a discrete interface,
 765  * for selective taskregister access operations.  Nice JOB Klaus!!!
 766  * Glad to be able to work and co-develop this with you and IBM.
 767  */
 768 ide_startstop_t flagged_taskfile (ide_drive_t *drive, ide_task_t *task)
 769 {
 770         ide_hwif_t *hwif        = HWIF(drive);
 771         task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
 772         hob_struct_t *hobfile   = (hob_struct_t *) task->hobRegister;
 773
 774         if (task->data_phase == TASKFILE_MULTI_IN ||
 775             task->data_phase == TASKFILE_MULTI_OUT) {
 776                 if (!drive->mult_count) {
 777                         printk(KERN_ERR "%s: multimode not set!\n", drive->name);
 778                         return ide_stopped;
 779                 }
 780         }
 781
 782         /*
 783          * (ks) Check taskfile in flags.
 784          * If set, then execute as it is defined.
 785          * If not set, then define default settings.
 786          * The default values are:
 787          *      read all taskfile registers (except data)
 788          *      read the hob registers (sector, nsector, lcyl, hcyl)
 789          */
 790         if (task->tf_in_flags.all == 0) {
 791                 task->tf_in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
 792                 if (drive->addressing == 1)
 793                         task->tf_in_flags.all |= (IDE_HOB_STD_IN_FLAGS  << 8);
 794         }
 795
 796         /* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
 797         if (IDE_CONTROL_REG)
 798                 /* clear nIEN */
 799                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 800         SELECT_MASK(drive, 0);
 801
 802         if (task->tf_out_flags.b.data) {
 803                 u16 data =  taskfile->data + (hobfile->data << 8);
 804                 hwif->OUTW(data, IDE_DATA_REG);
 805         }
 806
 807         /* (ks) send hob registers first */
 808         if (task->tf_out_flags.b.nsector_hob)
 809                 hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
 810         if (task->tf_out_flags.b.sector_hob)
 811                 hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
 812         if (task->tf_out_flags.b.lcyl_hob)
 813                 hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
 814         if (task->tf_out_flags.b.hcyl_hob)
 815                 hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
 816
 817         /* (ks) Send now the standard registers */
 818         if (task->tf_out_flags.b.error_feature)
 819                 hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
 820         /* refers to number of sectors to transfer */
 821         if (task->tf_out_flags.b.nsector)
 822                 hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
 823         /* refers to sector offset or start sector */
 824         if (task->tf_out_flags.b.sector)
 825                 hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
 826         if (task->tf_out_flags.b.lcyl)
 827                 hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
 828         if (task->tf_out_flags.b.hcyl)
 829                 hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
 830
 831         /*
 832          * (ks) In the flagged taskfile approch, we will use all specified
 833          * registers and the register value will not be changed, except the
 834          * select bit (master/slave) in the drive_head register. We must make
 835          * sure that the desired drive is selected.
 836          */
 837         hwif->OUTB(taskfile->device_head | drive->select.all, IDE_SELECT_REG);
 838         switch(task->data_phase) {
 839
 840                 case TASKFILE_OUT_DMAQ:
 841                 case TASKFILE_OUT_DMA:
 842                 case TASKFILE_IN_DMAQ:
 843                 case TASKFILE_IN_DMA:
 844                         hwif->dma_setup(drive);
 845                         hwif->dma_exec_cmd(drive, taskfile->command);
 846                         hwif->dma_start(drive);
 847                         break;
 848
 849                 default:
 850                         if (task->handler == NULL)
 851                                 return ide_stopped;
 852
 853                         /* Issue the command */
 854                         if (task->prehandler) {
 855                                 hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
 856                                 ndelay(400);    /* FIXME */
 857                                 return task->prehandler(drive, task->rq);
 858                         }
 859                         ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
 860         }
 861
 862         return ide_started;
 863 }