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         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();
 227         if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
 228                 return ide_error(drive, "task_no_data_intr", stat);
 229                 /* calls ide_end_drive_cmd */
 230         }
 231         if (args)
 232                 ide_end_drive_cmd(drive, stat, hwif->INB(IDE_ERROR_REG));
 233
 234         return ide_stopped;
 235 }
 236
 237 EXPORT_SYMBOL(task_no_data_intr);
 238
 239 static u8 wait_drive_not_busy(ide_drive_t *drive)
 240 {
 241         ide_hwif_t *hwif = HWIF(drive);
 242         int retries = 100;
 243         u8 stat;
 244
 245         /*
 246          * Last sector was transfered, wait until drive is ready.
 247          * This can take up to 10 usec, but we will wait max 1 ms
 248          * (drive_cmd_intr() waits that long).
 249          */
 250         while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
 251                 udelay(10);
 252
 253         if (!retries)
 254                 printk(KERN_ERR "%s: drive still BUSY!\n", drive->name);
 255
 256         return stat;
 257 }
 258
 259 static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
 260 {
 261         ide_hwif_t *hwif = drive->hwif;
 262         struct scatterlist *sg = hwif->sg_table;
 263         struct page *page;
 264 #ifdef CONFIG_HIGHMEM
 265         unsigned long flags;
 266 #endif
 267         unsigned int offset;
 268         u8 *buf;
 269
 270         page = sg[hwif->cursg].page;
 271         offset = sg[hwif->cursg].offset + hwif->cursg_ofs * SECTOR_SIZE;
 272
 273         /* get the current page and offset */
 274         page = nth_page(page, (offset >> PAGE_SHIFT));
 275         offset %= PAGE_SIZE;
 276
 277 #ifdef CONFIG_HIGHMEM
 278         local_irq_save(flags);
 279 #endif
 280         buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
 281
 282         hwif->nleft--;
 283         hwif->cursg_ofs++;
 284
 285         if ((hwif->cursg_ofs * SECTOR_SIZE) == sg[hwif->cursg].length) {
 286                 hwif->cursg++;
 287                 hwif->cursg_ofs = 0;
 288         }
 289
 290         /* do the actual data transfer */
 291         if (write)
 292                 taskfile_output_data(drive, buf, SECTOR_WORDS);
 293         else
 294                 taskfile_input_data(drive, buf, SECTOR_WORDS);
 295
 296         kunmap_atomic(buf, KM_BIO_SRC_IRQ);
 297 #ifdef CONFIG_HIGHMEM
 298         local_irq_restore(flags);
 299 #endif
 300 }
 301
 302 static void ide_pio_multi(ide_drive_t *drive, unsigned int write)
 303 {
 304         unsigned int nsect;
 305
 306         nsect = min_t(unsigned int, drive->hwif->nleft, drive->mult_count);
 307         while (nsect--)
 308                 ide_pio_sector(drive, write);
 309 }
 310
 311 static void ide_pio_datablock(ide_drive_t *drive, struct request *rq,
 312                                      unsigned int write)
 313 {
 314         if (rq->bio)    /* fs request */
 315                 rq->errors = 0;
 316
 317         touch_softlockup_watchdog();
 318
 319         switch (drive->hwif->data_phase) {
 320         case TASKFILE_MULTI_IN:
 321         case TASKFILE_MULTI_OUT:
 322                 ide_pio_multi(drive, write);
 323                 break;
 324         default:
 325                 ide_pio_sector(drive, write);
 326                 break;
 327         }
 328 }
 329
 330 static ide_startstop_t task_error(ide_drive_t *drive, struct request *rq,
 331                                   const char *s, u8 stat)
 332 {
 333         if (rq->bio) {
 334                 ide_hwif_t *hwif = drive->hwif;
 335                 int sectors = hwif->nsect - hwif->nleft;
 336
 337                 switch (hwif->data_phase) {
 338                 case TASKFILE_IN:
 339                         if (hwif->nleft)
 340                                 break;
 341                         /* fall through */
 342                 case TASKFILE_OUT:
 343                         sectors--;
 344                         break;
 345                 case TASKFILE_MULTI_IN:
 346                         if (hwif->nleft)
 347                                 break;
 348                         /* fall through */
 349                 case TASKFILE_MULTI_OUT:
 350                         sectors -= drive->mult_count;
 351                 default:
 352                         break;
 353                 }
 354
 355                 if (sectors > 0) {
 356                         ide_driver_t *drv;
 357
 358                         drv = *(ide_driver_t **)rq->rq_disk->private_data;
 359                         drv->end_request(drive, 1, sectors);
 360                 }
 361         }
 362         return ide_error(drive, s, stat);
 363 }
 364
 365 static void task_end_request(ide_drive_t *drive, struct request *rq, u8 stat)
 366 {
 367         if (rq->flags & REQ_DRIVE_TASKFILE) {
 368                 ide_task_t *task = rq->special;
 369
 370                 if (task->tf_out_flags.all) {
 371                         u8 err = drive->hwif->INB(IDE_ERROR_REG);
 372                         ide_end_drive_cmd(drive, stat, err);
 373                         return;
 374                 }
 375         }
 376
 377         if (rq->rq_disk) {
 378                 ide_driver_t *drv;
 379
 380                 drv = *(ide_driver_t **)rq->rq_disk->private_data;;
 381                 drv->end_request(drive, 1, rq->hard_nr_sectors);
 382         } else
 383                 ide_end_request(drive, 1, rq->hard_nr_sectors);
 384 }
 385
 386 /*
 387  * Handler for command with PIO data-in phase (Read/Read Multiple).
 388  */
 389 ide_startstop_t task_in_intr (ide_drive_t *drive)
 390 {
 391         ide_hwif_t *hwif = drive->hwif;
 392         struct request *rq = HWGROUP(drive)->rq;
 393         u8 stat = hwif->INB(IDE_STATUS_REG);
 394
 395         /* new way for dealing with premature shared PCI interrupts */
 396         if (!OK_STAT(stat, DATA_READY, BAD_R_STAT)) {
 397                 if (stat & (ERR_STAT | DRQ_STAT))
 398                         return task_error(drive, rq, __FUNCTION__, stat);
 399                 /* No data yet, so wait for another IRQ. */
 400                 ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
 401                 return ide_started;
 402         }
 403
 404         ide_pio_datablock(drive, rq, 0);
 405
 406         /* If it was the last datablock check status and finish transfer. */
 407         if (!hwif->nleft) {
 408                 stat = wait_drive_not_busy(drive);
 409                 if (!OK_STAT(stat, 0, BAD_R_STAT))
 410                         return task_error(drive, rq, __FUNCTION__, stat);
 411                 task_end_request(drive, rq, stat);
 412                 return ide_stopped;
 413         }
 414
 415         /* Still data left to transfer. */
 416         ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
 417
 418         return ide_started;
 419 }
 420 EXPORT_SYMBOL(task_in_intr);
 421
 422 /*
 423  * Handler for command with PIO data-out phase (Write/Write Multiple).
 424  */
 425 static ide_startstop_t task_out_intr (ide_drive_t *drive)
 426 {
 427         ide_hwif_t *hwif = drive->hwif;
 428         struct request *rq = HWGROUP(drive)->rq;
 429         u8 stat = hwif->INB(IDE_STATUS_REG);
 430
 431         if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat))
 432                 return task_error(drive, rq, __FUNCTION__, stat);
 433
 434         /* Deal with unexpected ATA data phase. */
 435         if (((stat & DRQ_STAT) == 0) ^ !hwif->nleft)
 436                 return task_error(drive, rq, __FUNCTION__, stat);
 437
 438         if (!hwif->nleft) {
 439                 task_end_request(drive, rq, stat);
 440                 return ide_stopped;
 441         }
 442
 443         /* Still data left to transfer. */
 444         ide_pio_datablock(drive, rq, 1);
 445         ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
 446
 447         return ide_started;
 448 }
 449
 450 ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq)
 451 {
 452         ide_startstop_t startstop;
 453
 454         if (ide_wait_stat(&startstop, drive, DATA_READY,
 455                           drive->bad_wstat, WAIT_DRQ)) {
 456                 printk(KERN_ERR "%s: no DRQ after issuing %sWRITE%s\n",
 457                                 drive->name,
 458                                 drive->hwif->data_phase ? "MULT" : "",
 459                                 drive->addressing ? "_EXT" : "");
 460                 return startstop;
 461         }
 462
 463         if (!drive->unmask)
 464                 local_irq_disable();
 465
 466         ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
 467         ide_pio_datablock(drive, rq, 1);
 468
 469         return ide_started;
 470 }
 471 EXPORT_SYMBOL(pre_task_out_intr);
 472
 473 static int ide_diag_taskfile(ide_drive_t *drive, ide_task_t *args, unsigned long data_size, u8 *buf)
 474 {
 475         struct request rq;
 476
 477         memset(&rq, 0, sizeof(rq));
 478         rq.flags = REQ_DRIVE_TASKFILE;
 479         rq.buffer = buf;
 480
 481         /*
 482          * (ks) We transfer currently only whole sectors.
 483          * This is suffient for now.  But, it would be great,
 484          * if we would find a solution to transfer any size.
 485          * To support special commands like READ LONG.
 486          */
 487         if (args->command_type != IDE_DRIVE_TASK_NO_DATA) {
 488                 if (data_size == 0)
 489                         rq.nr_sectors = (args->hobRegister[IDE_NSECTOR_OFFSET] << 8) | args->tfRegister[IDE_NSECTOR_OFFSET];
 490                 else
 491                         rq.nr_sectors = data_size / SECTOR_SIZE;
 492
 493                 if (!rq.nr_sectors) {
 494                         printk(KERN_ERR "%s: in/out command without data\n",
 495                                         drive->name);
 496                         return -EFAULT;
 497                 }
 498
 499                 rq.hard_nr_sectors = rq.nr_sectors;
 500                 rq.hard_cur_sectors = rq.current_nr_sectors = rq.nr_sectors;
 501
 502                 if (args->command_type == IDE_DRIVE_TASK_RAW_WRITE)
 503                         rq.flags |= REQ_RW;
 504         }
 505
 506         rq.special = args;
 507         args->rq = &rq;
 508         return ide_do_drive_cmd(drive, &rq, ide_wait);
 509 }
 510
 511 int ide_raw_taskfile (ide_drive_t *drive, ide_task_t *args, u8 *buf)
 512 {
 513         return ide_diag_taskfile(drive, args, 0, buf);
 514 }
 515
 516 EXPORT_SYMBOL(ide_raw_taskfile);
 517
 518 int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 519 {
 520         ide_task_request_t      *req_task;
 521         ide_task_t              args;
 522         u8 *outbuf              = NULL;
 523         u8 *inbuf               = NULL;
 524         task_ioreg_t *argsptr   = args.tfRegister;
 525         task_ioreg_t *hobsptr   = args.hobRegister;
 526         int err                 = 0;
 527         int tasksize            = sizeof(struct ide_task_request_s);
 528         int taskin              = 0;
 529         int taskout             = 0;
 530         u8 io_32bit             = drive->io_32bit;
 531         char __user *buf = (char __user *)arg;
 532
 533 //      printk("IDE Taskfile ...\n");
 534
 535         req_task = kzalloc(tasksize, GFP_KERNEL);
 536         if (req_task == NULL) return -ENOMEM;
 537         if (copy_from_user(req_task, buf, tasksize)) {
 538                 kfree(req_task);
 539                 return -EFAULT;
 540         }
 541
 542         taskout = (int) req_task->out_size;
 543         taskin  = (int) req_task->in_size;
 544
 545         if (taskout) {
 546                 int outtotal = tasksize;
 547                 outbuf = kzalloc(taskout, GFP_KERNEL);
 548                 if (outbuf == NULL) {
 549                         err = -ENOMEM;
 550                         goto abort;
 551                 }
 552                 if (copy_from_user(outbuf, buf + outtotal, taskout)) {
 553                         err = -EFAULT;
 554                         goto abort;
 555                 }
 556         }
 557
 558         if (taskin) {
 559                 int intotal = tasksize + taskout;
 560                 inbuf = kzalloc(taskin, GFP_KERNEL);
 561                 if (inbuf == NULL) {
 562                         err = -ENOMEM;
 563                         goto abort;
 564                 }
 565                 if (copy_from_user(inbuf, buf + intotal, taskin)) {
 566                         err = -EFAULT;
 567                         goto abort;
 568                 }
 569         }
 570
 571         memset(&args, 0, sizeof(ide_task_t));
 572         memcpy(argsptr, req_task->io_ports, HDIO_DRIVE_TASK_HDR_SIZE);
 573         memcpy(hobsptr, req_task->hob_ports, HDIO_DRIVE_HOB_HDR_SIZE);
 574
 575         args.tf_in_flags  = req_task->in_flags;
 576         args.tf_out_flags = req_task->out_flags;
 577         args.data_phase   = req_task->data_phase;
 578         args.command_type = req_task->req_cmd;
 579
 580         drive->io_32bit = 0;
 581         switch(req_task->data_phase) {
 582                 case TASKFILE_OUT_DMAQ:
 583                 case TASKFILE_OUT_DMA:
 584                         err = ide_diag_taskfile(drive, &args, taskout, outbuf);
 585                         break;
 586                 case TASKFILE_IN_DMAQ:
 587                 case TASKFILE_IN_DMA:
 588                         err = ide_diag_taskfile(drive, &args, taskin, inbuf);
 589                         break;
 590                 case TASKFILE_MULTI_OUT:
 591                         if (!drive->mult_count) {
 592                                 /* (hs): give up if multcount is not set */
 593                                 printk(KERN_ERR "%s: %s Multimode Write " \
 594                                         "multcount is not set\n",
 595                                         drive->name, __FUNCTION__);
 596                                 err = -EPERM;
 597                                 goto abort;
 598                         }
 599                         /* fall through */
 600                 case TASKFILE_OUT:
 601                         args.prehandler = &pre_task_out_intr;
 602                         args.handler = &task_out_intr;
 603                         err = ide_diag_taskfile(drive, &args, taskout, outbuf);
 604                         break;
 605                 case TASKFILE_MULTI_IN:
 606                         if (!drive->mult_count) {
 607                                 /* (hs): give up if multcount is not set */
 608                                 printk(KERN_ERR "%s: %s Multimode Read failure " \
 609                                         "multcount is not set\n",
 610                                         drive->name, __FUNCTION__);
 611                                 err = -EPERM;
 612                                 goto abort;
 613                         }
 614                         /* fall through */
 615                 case TASKFILE_IN:
 616                         args.handler = &task_in_intr;
 617                         err = ide_diag_taskfile(drive, &args, taskin, inbuf);
 618                         break;
 619                 case TASKFILE_NO_DATA:
 620                         args.handler = &task_no_data_intr;
 621                         err = ide_diag_taskfile(drive, &args, 0, NULL);
 622                         break;
 623                 default:
 624                         err = -EFAULT;
 625                         goto abort;
 626         }
 627
 628         memcpy(req_task->io_ports, &(args.tfRegister), HDIO_DRIVE_TASK_HDR_SIZE);
 629         memcpy(req_task->hob_ports, &(args.hobRegister), HDIO_DRIVE_HOB_HDR_SIZE);
 630         req_task->in_flags  = args.tf_in_flags;
 631         req_task->out_flags = args.tf_out_flags;
 632
 633         if (copy_to_user(buf, req_task, tasksize)) {
 634                 err = -EFAULT;
 635                 goto abort;
 636         }
 637         if (taskout) {
 638                 int outtotal = tasksize;
 639                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
 640                         err = -EFAULT;
 641                         goto abort;
 642                 }
 643         }
 644         if (taskin) {
 645                 int intotal = tasksize + taskout;
 646                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
 647                         err = -EFAULT;
 648                         goto abort;
 649                 }
 650         }
 651 abort:
 652         kfree(req_task);
 653         kfree(outbuf);
 654         kfree(inbuf);
 655
 656 //      printk("IDE Taskfile ioctl ended. rc = %i\n", err);
 657
 658         drive->io_32bit = io_32bit;
 659
 660         return err;
 661 }
 662
 663 int ide_wait_cmd (ide_drive_t *drive, u8 cmd, u8 nsect, u8 feature, u8 sectors, u8 *buf)
 664 {
 665         struct request rq;
 666         u8 buffer[4];
 667
 668         if (!buf)
 669                 buf = buffer;
 670         memset(buf, 0, 4 + SECTOR_WORDS * 4 * sectors);
 671         ide_init_drive_cmd(&rq);
 672         rq.buffer = buf;
 673         *buf++ = cmd;
 674         *buf++ = nsect;
 675         *buf++ = feature;
 676         *buf++ = sectors;
 677         return ide_do_drive_cmd(drive, &rq, ide_wait);
 678 }
 679
 680 /*
 681  * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
 682  */
 683 int ide_cmd_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 684 {
 685         int err = 0;
 686         u8 args[4], *argbuf = args;
 687         u8 xfer_rate = 0;
 688         int argsize = 4;
 689         ide_task_t tfargs;
 690
 691         if (NULL == (void *) arg) {
 692                 struct request rq;
 693                 ide_init_drive_cmd(&rq);
 694                 return ide_do_drive_cmd(drive, &rq, ide_wait);
 695         }
 696
 697         if (copy_from_user(args, (void __user *)arg, 4))
 698                 return -EFAULT;
 699
 700         memset(&tfargs, 0, sizeof(ide_task_t));
 701         tfargs.tfRegister[IDE_FEATURE_OFFSET] = args[2];
 702         tfargs.tfRegister[IDE_NSECTOR_OFFSET] = args[3];
 703         tfargs.tfRegister[IDE_SECTOR_OFFSET]  = args[1];
 704         tfargs.tfRegister[IDE_LCYL_OFFSET]    = 0x00;
 705         tfargs.tfRegister[IDE_HCYL_OFFSET]    = 0x00;
 706         tfargs.tfRegister[IDE_SELECT_OFFSET]  = 0x00;
 707         tfargs.tfRegister[IDE_COMMAND_OFFSET] = args[0];
 708
 709         if (args[3]) {
 710                 argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
 711                 argbuf = kzalloc(argsize, GFP_KERNEL);
 712                 if (argbuf == NULL)
 713                         return -ENOMEM;
 714         }
 715         if (set_transfer(drive, &tfargs)) {
 716                 xfer_rate = args[1];
 717                 if (ide_ata66_check(drive, &tfargs))
 718                         goto abort;
 719         }
 720
 721         err = ide_wait_cmd(drive, args[0], args[1], args[2], args[3], argbuf);
 722
 723         if (!err && xfer_rate) {
 724                 /* active-retuning-calls future */
 725                 ide_set_xfer_rate(drive, xfer_rate);
 726                 ide_driveid_update(drive);
 727         }
 728 abort:
 729         if (copy_to_user((void __user *)arg, argbuf, argsize))
 730                 err = -EFAULT;
 731         if (argsize > 4)
 732                 kfree(argbuf);
 733         return err;
 734 }
 735
 736 static int ide_wait_cmd_task(ide_drive_t *drive, u8 *buf)
 737 {
 738         struct request rq;
 739
 740         ide_init_drive_cmd(&rq);
 741         rq.flags = REQ_DRIVE_TASK;
 742         rq.buffer = buf;
 743         return ide_do_drive_cmd(drive, &rq, ide_wait);
 744 }
 745
 746 /*
 747  * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
 748  */
 749 int ide_task_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 750 {
 751         void __user *p = (void __user *)arg;
 752         int err = 0;
 753         u8 args[7], *argbuf = args;
 754         int argsize = 7;
 755
 756         if (copy_from_user(args, p, 7))
 757                 return -EFAULT;
 758         err = ide_wait_cmd_task(drive, argbuf);
 759         if (copy_to_user(p, argbuf, argsize))
 760                 err = -EFAULT;
 761         return err;
 762 }
 763
 764 /*
 765  * NOTICE: This is additions from IBM to provide a discrete interface,
 766  * for selective taskregister access operations.  Nice JOB Klaus!!!
 767  * Glad to be able to work and co-develop this with you and IBM.
 768  */
 769 ide_startstop_t flagged_taskfile (ide_drive_t *drive, ide_task_t *task)
 770 {
 771         ide_hwif_t *hwif        = HWIF(drive);
 772         task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
 773         hob_struct_t *hobfile   = (hob_struct_t *) task->hobRegister;
 774
 775         if (task->data_phase == TASKFILE_MULTI_IN ||
 776             task->data_phase == TASKFILE_MULTI_OUT) {
 777                 if (!drive->mult_count) {
 778                         printk(KERN_ERR "%s: multimode not set!\n", drive->name);
 779                         return ide_stopped;
 780                 }
 781         }
 782
 783         /*
 784          * (ks) Check taskfile in flags.
 785          * If set, then execute as it is defined.
 786          * If not set, then define default settings.
 787          * The default values are:
 788          *      read all taskfile registers (except data)
 789          *      read the hob registers (sector, nsector, lcyl, hcyl)
 790          */
 791         if (task->tf_in_flags.all == 0) {
 792                 task->tf_in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
 793                 if (drive->addressing == 1)
 794                         task->tf_in_flags.all |= (IDE_HOB_STD_IN_FLAGS  << 8);
 795         }
 796
 797         /* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
 798         if (IDE_CONTROL_REG)
 799                 /* clear nIEN */
 800                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 801         SELECT_MASK(drive, 0);
 802
 803         if (task->tf_out_flags.b.data) {
 804                 u16 data =  taskfile->data + (hobfile->data << 8);
 805                 hwif->OUTW(data, IDE_DATA_REG);
 806         }
 807
 808         /* (ks) send hob registers first */
 809         if (task->tf_out_flags.b.nsector_hob)
 810                 hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
 811         if (task->tf_out_flags.b.sector_hob)
 812                 hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
 813         if (task->tf_out_flags.b.lcyl_hob)
 814                 hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
 815         if (task->tf_out_flags.b.hcyl_hob)
 816                 hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
 817
 818         /* (ks) Send now the standard registers */
 819         if (task->tf_out_flags.b.error_feature)
 820                 hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
 821         /* refers to number of sectors to transfer */
 822         if (task->tf_out_flags.b.nsector)
 823                 hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
 824         /* refers to sector offset or start sector */
 825         if (task->tf_out_flags.b.sector)
 826                 hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
 827         if (task->tf_out_flags.b.lcyl)
 828                 hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
 829         if (task->tf_out_flags.b.hcyl)
 830                 hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
 831
 832         /*
 833          * (ks) In the flagged taskfile approch, we will use all specified
 834          * registers and the register value will not be changed, except the
 835          * select bit (master/slave) in the drive_head register. We must make
 836          * sure that the desired drive is selected.
 837          */
 838         hwif->OUTB(taskfile->device_head | drive->select.all, IDE_SELECT_REG);
 839         switch(task->data_phase) {
 840
 841                 case TASKFILE_OUT_DMAQ:
 842                 case TASKFILE_OUT_DMA:
 843                 case TASKFILE_IN_DMAQ:
 844                 case TASKFILE_IN_DMA:
 845                         hwif->dma_setup(drive);
 846                         hwif->dma_exec_cmd(drive, taskfile->command);
 847                         hwif->dma_start(drive);
 848                         break;
 849
 850                 default:
 851                         if (task->handler == NULL)
 852                                 return ide_stopped;
 853
 854                         /* Issue the command */
 855                         if (task->prehandler) {
 856                                 hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
 857                                 ndelay(400);    /* FIXME */
 858                                 return task->prehandler(drive, task->rq);
 859                         }
 860                         ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
 861         }
 862
 863         return ide_started;
 864 }