git.oblomov.eu Git - linux-2.6/blob - drivers/ide/ide-taskfile.c

   1 /*
   2  * linux/drivers/ide/ide-taskfile.c     Version 0.38    March 05, 2003
   3  *
   4  *  Copyright (C) 2000-2002     Michael Cornwell <cornwell@acm.org>
   5  *  Copyright (C) 2000-2002     Andre Hedrick <andre@linux-ide.org>
   6  *  Copyright (C) 2001-2002     Klaus Smolin
   7  *                                      IBM Storage Technology Division
   8  *  Copyright (C) 2003-2004     Bartlomiej Zolnierkiewicz
   9  *
  10  *  The big the bad and the ugly.
  11  *
  12  *  Problems to be fixed because of BH interface or the lack therefore.
  13  *
  14  *  Fill me in stupid !!!
  15  *
  16  *  HOST:
  17  *      General refers to the Controller and Driver "pair".
  18  *  DATA HANDLER:
  19  *      Under the context of Linux it generally refers to an interrupt handler.
  20  *      However, it correctly describes the 'HOST'
  21  *  DATA BLOCK:
  22  *      The amount of data needed to be transfered as predefined in the
  23  *      setup of the device.
  24  *  STORAGE ATOMIC:
  25  *      The 'DATA BLOCK' associated to the 'DATA HANDLER', and can be as
  26  *      small as a single sector or as large as the entire command block
  27  *      request.
  28  */
  29
  30 #include <linux/config.h>
  31 #include <linux/module.h>
  32 #include <linux/types.h>
  33 #include <linux/string.h>
  34 #include <linux/kernel.h>
  35 #include <linux/timer.h>
  36 #include <linux/mm.h>
  37 #include <linux/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 #define DEBUG_TASKFILE  0       /* unset when fixed */
  55
  56 static void ata_bswap_data (void *buffer, int wcount)
  57 {
  58         u16 *p = buffer;
  59
  60         while (wcount--) {
  61                 *p = *p << 8 | *p >> 8; p++;
  62                 *p = *p << 8 | *p >> 8; p++;
  63         }
  64 }
  65
  66 static void taskfile_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
  67 {
  68         HWIF(drive)->ata_input_data(drive, buffer, wcount);
  69         if (drive->bswap)
  70                 ata_bswap_data(buffer, wcount);
  71 }
  72
  73 static void taskfile_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
  74 {
  75         if (drive->bswap) {
  76                 ata_bswap_data(buffer, wcount);
  77                 HWIF(drive)->ata_output_data(drive, buffer, wcount);
  78                 ata_bswap_data(buffer, wcount);
  79         } else {
  80                 HWIF(drive)->ata_output_data(drive, buffer, wcount);
  81         }
  82 }
  83
  84 int taskfile_lib_get_identify (ide_drive_t *drive, u8 *buf)
  85 {
  86         ide_task_t args;
  87         memset(&args, 0, sizeof(ide_task_t));
  88         args.tfRegister[IDE_NSECTOR_OFFSET]     = 0x01;
  89         if (drive->media == ide_disk)
  90                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_IDENTIFY;
  91         else
  92                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_PIDENTIFY;
  93         args.command_type = IDE_DRIVE_TASK_IN;
  94         args.data_phase   = TASKFILE_IN;
  95         args.handler      = &task_in_intr;
  96         return ide_raw_taskfile(drive, &args, buf);
  97 }
  98
  99 ide_startstop_t do_rw_taskfile (ide_drive_t *drive, ide_task_t *task)
 100 {
 101         ide_hwif_t *hwif        = HWIF(drive);
 102         task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
 103         hob_struct_t *hobfile   = (hob_struct_t *) task->hobRegister;
 104         u8 HIHI                 = (drive->addressing == 1) ? 0xE0 : 0xEF;
 105
 106         /* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
 107         if (IDE_CONTROL_REG) {
 108                 /* clear nIEN */
 109                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 110         }
 111         SELECT_MASK(drive, 0);
 112
 113         if (drive->addressing == 1) {
 114                 hwif->OUTB(hobfile->feature, IDE_FEATURE_REG);
 115                 hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
 116                 hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
 117                 hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
 118                 hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
 119         }
 120
 121         hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
 122         hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
 123         hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
 124         hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
 125         hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
 126
 127         hwif->OUTB((taskfile->device_head & HIHI) | drive->select.all, IDE_SELECT_REG);
 128
 129         if (task->handler != NULL) {
 130                 if (task->prehandler != NULL) {
 131                         hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
 132                         ndelay(400);    /* FIXME */
 133                         return task->prehandler(drive, task->rq);
 134                 }
 135                 ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
 136                 return ide_started;
 137         }
 138
 139         if (!drive->using_dma)
 140                 return ide_stopped;
 141
 142         switch (taskfile->command) {
 143                 case WIN_WRITEDMA_ONCE:
 144                 case WIN_WRITEDMA:
 145                 case WIN_WRITEDMA_EXT:
 146                 case WIN_READDMA_ONCE:
 147                 case WIN_READDMA:
 148                 case WIN_READDMA_EXT:
 149                 case WIN_IDENTIFY_DMA:
 150                         if (!hwif->dma_setup(drive)) {
 151                                 hwif->dma_exec_cmd(drive, taskfile->command);
 152                                 hwif->dma_start(drive);
 153                                 return ide_started;
 154                         }
 155                         break;
 156                 default:
 157                         if (task->handler == NULL)
 158                                 return ide_stopped;
 159         }
 160
 161         return ide_stopped;
 162 }
 163
 164 /*
 165  * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
 166  */
 167 ide_startstop_t set_multmode_intr (ide_drive_t *drive)
 168 {
 169         ide_hwif_t *hwif = HWIF(drive);
 170         u8 stat;
 171
 172         if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
 173                 drive->mult_count = drive->mult_req;
 174         } else {
 175                 drive->mult_req = drive->mult_count = 0;
 176                 drive->special.b.recalibrate = 1;
 177                 (void) ide_dump_status(drive, "set_multmode", stat);
 178         }
 179         return ide_stopped;
 180 }
 181
 182 /*
 183  * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
 184  */
 185 ide_startstop_t set_geometry_intr (ide_drive_t *drive)
 186 {
 187         ide_hwif_t *hwif = HWIF(drive);
 188         int retries = 5;
 189         u8 stat;
 190
 191         while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
 192                 udelay(10);
 193
 194         if (OK_STAT(stat, READY_STAT, BAD_STAT))
 195                 return ide_stopped;
 196
 197         if (stat & (ERR_STAT|DRQ_STAT))
 198                 return ide_error(drive, "set_geometry_intr", stat);
 199
 200         if (HWGROUP(drive)->handler != NULL)
 201                 BUG();
 202         ide_set_handler(drive, &set_geometry_intr, WAIT_WORSTCASE, NULL);
 203         return ide_started;
 204 }
 205
 206 /*
 207  * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
 208  */
 209 ide_startstop_t recal_intr (ide_drive_t *drive)
 210 {
 211         ide_hwif_t *hwif = HWIF(drive);
 212         u8 stat;
 213
 214         if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG), READY_STAT, BAD_STAT))
 215                 return ide_error(drive, "recal_intr", stat);
 216         return ide_stopped;
 217 }
 218
 219 /*
 220  * Handler for commands without a data phase
 221  */
 222 ide_startstop_t task_no_data_intr (ide_drive_t *drive)
 223 {
 224         ide_task_t *args        = HWGROUP(drive)->rq->special;
 225         ide_hwif_t *hwif        = HWIF(drive);
 226         u8 stat;
 227
 228         local_irq_enable();
 229         if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
 230                 return ide_error(drive, "task_no_data_intr", stat);
 231                 /* calls ide_end_drive_cmd */
 232         }
 233         if (args)
 234                 ide_end_drive_cmd(drive, stat, hwif->INB(IDE_ERROR_REG));
 235
 236         return ide_stopped;
 237 }
 238
 239 EXPORT_SYMBOL(task_no_data_intr);
 240
 241 static u8 wait_drive_not_busy(ide_drive_t *drive)
 242 {
 243         ide_hwif_t *hwif = HWIF(drive);
 244         int retries = 100;
 245         u8 stat;
 246
 247         /*
 248          * Last sector was transfered, wait until drive is ready.
 249          * This can take up to 10 usec, but we will wait max 1 ms
 250          * (drive_cmd_intr() waits that long).
 251          */
 252         while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
 253                 udelay(10);
 254
 255         if (!retries)
 256                 printk(KERN_ERR "%s: drive still BUSY!\n", drive->name);
 257
 258         return stat;
 259 }
 260
 261 static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
 262 {
 263         ide_hwif_t *hwif = drive->hwif;
 264         struct scatterlist *sg = hwif->sg_table;
 265         struct page *page;
 266 #ifdef CONFIG_HIGHMEM
 267         unsigned long flags;
 268 #endif
 269         unsigned int offset;
 270         u8 *buf;
 271
 272         page = sg[hwif->cursg].page;
 273         offset = sg[hwif->cursg].offset + hwif->cursg_ofs * SECTOR_SIZE;
 274
 275         /* get the current page and offset */
 276         page = nth_page(page, (offset >> PAGE_SHIFT));
 277         offset %= PAGE_SIZE;
 278
 279 #ifdef CONFIG_HIGHMEM
 280         local_irq_save(flags);
 281 #endif
 282         buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
 283
 284         hwif->nleft--;
 285         hwif->cursg_ofs++;
 286
 287         if ((hwif->cursg_ofs * SECTOR_SIZE) == sg[hwif->cursg].length) {
 288                 hwif->cursg++;
 289                 hwif->cursg_ofs = 0;
 290         }
 291
 292         /* do the actual data transfer */
 293         if (write)
 294                 taskfile_output_data(drive, buf, SECTOR_WORDS);
 295         else
 296                 taskfile_input_data(drive, buf, SECTOR_WORDS);
 297
 298         kunmap_atomic(buf, KM_BIO_SRC_IRQ);
 299 #ifdef CONFIG_HIGHMEM
 300         local_irq_restore(flags);
 301 #endif
 302 }
 303
 304 static void ide_pio_multi(ide_drive_t *drive, unsigned int write)
 305 {
 306         unsigned int nsect;
 307
 308         nsect = min_t(unsigned int, drive->hwif->nleft, drive->mult_count);
 309         while (nsect--)
 310                 ide_pio_sector(drive, write);
 311 }
 312
 313 static inline void ide_pio_datablock(ide_drive_t *drive, struct request *rq,
 314                                      unsigned int write)
 315 {
 316         if (rq->bio)    /* fs request */
 317                 rq->errors = 0;
 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         ide_end_request(drive, 1, rq->hard_nr_sectors);
 378 }
 379
 380 /*
 381  * Handler for command with PIO data-in phase (Read/Read Multiple).
 382  */
 383 ide_startstop_t task_in_intr (ide_drive_t *drive)
 384 {
 385         ide_hwif_t *hwif = drive->hwif;
 386         struct request *rq = HWGROUP(drive)->rq;
 387         u8 stat = hwif->INB(IDE_STATUS_REG);
 388
 389         /* new way for dealing with premature shared PCI interrupts */
 390         if (!OK_STAT(stat, DATA_READY, BAD_R_STAT)) {
 391                 if (stat & (ERR_STAT | DRQ_STAT))
 392                         return task_error(drive, rq, __FUNCTION__, stat);
 393                 /* No data yet, so wait for another IRQ. */
 394                 ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
 395                 return ide_started;
 396         }
 397
 398         ide_pio_datablock(drive, rq, 0);
 399
 400         /* If it was the last datablock check status and finish transfer. */
 401         if (!hwif->nleft) {
 402                 stat = wait_drive_not_busy(drive);
 403                 if (!OK_STAT(stat, 0, BAD_R_STAT))
 404                         return task_error(drive, rq, __FUNCTION__, stat);
 405                 task_end_request(drive, rq, stat);
 406                 return ide_stopped;
 407         }
 408
 409         /* Still data left to transfer. */
 410         ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
 411
 412         return ide_started;
 413 }
 414 EXPORT_SYMBOL(task_in_intr);
 415
 416 /*
 417  * Handler for command with PIO data-out phase (Write/Write Multiple).
 418  */
 419 static ide_startstop_t task_out_intr (ide_drive_t *drive)
 420 {
 421         ide_hwif_t *hwif = drive->hwif;
 422         struct request *rq = HWGROUP(drive)->rq;
 423         u8 stat = hwif->INB(IDE_STATUS_REG);
 424
 425         if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat))
 426                 return task_error(drive, rq, __FUNCTION__, stat);
 427
 428         /* Deal with unexpected ATA data phase. */
 429         if (((stat & DRQ_STAT) == 0) ^ !hwif->nleft)
 430                 return task_error(drive, rq, __FUNCTION__, stat);
 431
 432         if (!hwif->nleft) {
 433                 task_end_request(drive, rq, stat);
 434                 return ide_stopped;
 435         }
 436
 437         /* Still data left to transfer. */
 438         ide_pio_datablock(drive, rq, 1);
 439         ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
 440
 441         return ide_started;
 442 }
 443
 444 ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq)
 445 {
 446         ide_startstop_t startstop;
 447
 448         if (ide_wait_stat(&startstop, drive, DATA_READY,
 449                           drive->bad_wstat, WAIT_DRQ)) {
 450                 printk(KERN_ERR "%s: no DRQ after issuing %sWRITE%s\n",
 451                                 drive->name,
 452                                 drive->hwif->data_phase ? "MULT" : "",
 453                                 drive->addressing ? "_EXT" : "");
 454                 return startstop;
 455         }
 456
 457         if (!drive->unmask)
 458                 local_irq_disable();
 459
 460         ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
 461         ide_pio_datablock(drive, rq, 1);
 462
 463         return ide_started;
 464 }
 465 EXPORT_SYMBOL(pre_task_out_intr);
 466
 467 static int ide_diag_taskfile(ide_drive_t *drive, ide_task_t *args, unsigned long data_size, u8 *buf)
 468 {
 469         struct request rq;
 470
 471         memset(&rq, 0, sizeof(rq));
 472         rq.flags = REQ_DRIVE_TASKFILE;
 473         rq.buffer = buf;
 474
 475         /*
 476          * (ks) We transfer currently only whole sectors.
 477          * This is suffient for now.  But, it would be great,
 478          * if we would find a solution to transfer any size.
 479          * To support special commands like READ LONG.
 480          */
 481         if (args->command_type != IDE_DRIVE_TASK_NO_DATA) {
 482                 if (data_size == 0)
 483                         rq.nr_sectors = (args->hobRegister[IDE_NSECTOR_OFFSET] << 8) | args->tfRegister[IDE_NSECTOR_OFFSET];
 484                 else
 485                         rq.nr_sectors = data_size / SECTOR_SIZE;
 486
 487                 if (!rq.nr_sectors) {
 488                         printk(KERN_ERR "%s: in/out command without data\n",
 489                                         drive->name);
 490                         return -EFAULT;
 491                 }
 492
 493                 rq.hard_nr_sectors = rq.nr_sectors;
 494                 rq.hard_cur_sectors = rq.current_nr_sectors = rq.nr_sectors;
 495
 496                 if (args->command_type == IDE_DRIVE_TASK_RAW_WRITE)
 497                         rq.flags |= REQ_RW;
 498         }
 499
 500         rq.special = args;
 501         args->rq = &rq;
 502         return ide_do_drive_cmd(drive, &rq, ide_wait);
 503 }
 504
 505 int ide_raw_taskfile (ide_drive_t *drive, ide_task_t *args, u8 *buf)
 506 {
 507         return ide_diag_taskfile(drive, args, 0, buf);
 508 }
 509
 510 EXPORT_SYMBOL(ide_raw_taskfile);
 511
 512 int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 513 {
 514         ide_task_request_t      *req_task;
 515         ide_task_t              args;
 516         u8 *outbuf              = NULL;
 517         u8 *inbuf               = NULL;
 518         task_ioreg_t *argsptr   = args.tfRegister;
 519         task_ioreg_t *hobsptr   = args.hobRegister;
 520         int err                 = 0;
 521         int tasksize            = sizeof(struct ide_task_request_s);
 522         int taskin              = 0;
 523         int taskout             = 0;
 524         u8 io_32bit             = drive->io_32bit;
 525         char __user *buf = (char __user *)arg;
 526
 527 //      printk("IDE Taskfile ...\n");
 528
 529         req_task = kzalloc(tasksize, GFP_KERNEL);
 530         if (req_task == NULL) return -ENOMEM;
 531         if (copy_from_user(req_task, buf, tasksize)) {
 532                 kfree(req_task);
 533                 return -EFAULT;
 534         }
 535
 536         taskout = (int) req_task->out_size;
 537         taskin  = (int) req_task->in_size;
 538
 539         if (taskout) {
 540                 int outtotal = tasksize;
 541                 outbuf = kzalloc(taskout, GFP_KERNEL);
 542                 if (outbuf == NULL) {
 543                         err = -ENOMEM;
 544                         goto abort;
 545                 }
 546                 if (copy_from_user(outbuf, buf + outtotal, taskout)) {
 547                         err = -EFAULT;
 548                         goto abort;
 549                 }
 550         }
 551
 552         if (taskin) {
 553                 int intotal = tasksize + taskout;
 554                 inbuf = kzalloc(taskin, GFP_KERNEL);
 555                 if (inbuf == NULL) {
 556                         err = -ENOMEM;
 557                         goto abort;
 558                 }
 559                 if (copy_from_user(inbuf, buf + intotal, taskin)) {
 560                         err = -EFAULT;
 561                         goto abort;
 562                 }
 563         }
 564
 565         memset(&args, 0, sizeof(ide_task_t));
 566         memcpy(argsptr, req_task->io_ports, HDIO_DRIVE_TASK_HDR_SIZE);
 567         memcpy(hobsptr, req_task->hob_ports, HDIO_DRIVE_HOB_HDR_SIZE);
 568
 569         args.tf_in_flags  = req_task->in_flags;
 570         args.tf_out_flags = req_task->out_flags;
 571         args.data_phase   = req_task->data_phase;
 572         args.command_type = req_task->req_cmd;
 573
 574         drive->io_32bit = 0;
 575         switch(req_task->data_phase) {
 576                 case TASKFILE_OUT_DMAQ:
 577                 case TASKFILE_OUT_DMA:
 578                         err = ide_diag_taskfile(drive, &args, taskout, outbuf);
 579                         break;
 580                 case TASKFILE_IN_DMAQ:
 581                 case TASKFILE_IN_DMA:
 582                         err = ide_diag_taskfile(drive, &args, taskin, inbuf);
 583                         break;
 584                 case TASKFILE_MULTI_OUT:
 585                         if (!drive->mult_count) {
 586                                 /* (hs): give up if multcount is not set */
 587                                 printk(KERN_ERR "%s: %s Multimode Write " \
 588                                         "multcount is not set\n",
 589                                         drive->name, __FUNCTION__);
 590                                 err = -EPERM;
 591                                 goto abort;
 592                         }
 593                         /* fall through */
 594                 case TASKFILE_OUT:
 595                         args.prehandler = &pre_task_out_intr;
 596                         args.handler = &task_out_intr;
 597                         err = ide_diag_taskfile(drive, &args, taskout, outbuf);
 598                         break;
 599                 case TASKFILE_MULTI_IN:
 600                         if (!drive->mult_count) {
 601                                 /* (hs): give up if multcount is not set */
 602                                 printk(KERN_ERR "%s: %s Multimode Read failure " \
 603                                         "multcount is not set\n",
 604                                         drive->name, __FUNCTION__);
 605                                 err = -EPERM;
 606                                 goto abort;
 607                         }
 608                         /* fall through */
 609                 case TASKFILE_IN:
 610                         args.handler = &task_in_intr;
 611                         err = ide_diag_taskfile(drive, &args, taskin, inbuf);
 612                         break;
 613                 case TASKFILE_NO_DATA:
 614                         args.handler = &task_no_data_intr;
 615                         err = ide_diag_taskfile(drive, &args, 0, NULL);
 616                         break;
 617                 default:
 618                         err = -EFAULT;
 619                         goto abort;
 620         }
 621
 622         memcpy(req_task->io_ports, &(args.tfRegister), HDIO_DRIVE_TASK_HDR_SIZE);
 623         memcpy(req_task->hob_ports, &(args.hobRegister), HDIO_DRIVE_HOB_HDR_SIZE);
 624         req_task->in_flags  = args.tf_in_flags;
 625         req_task->out_flags = args.tf_out_flags;
 626
 627         if (copy_to_user(buf, req_task, tasksize)) {
 628                 err = -EFAULT;
 629                 goto abort;
 630         }
 631         if (taskout) {
 632                 int outtotal = tasksize;
 633                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
 634                         err = -EFAULT;
 635                         goto abort;
 636                 }
 637         }
 638         if (taskin) {
 639                 int intotal = tasksize + taskout;
 640                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
 641                         err = -EFAULT;
 642                         goto abort;
 643                 }
 644         }
 645 abort:
 646         kfree(req_task);
 647         kfree(outbuf);
 648         kfree(inbuf);
 649
 650 //      printk("IDE Taskfile ioctl ended. rc = %i\n", err);
 651
 652         drive->io_32bit = io_32bit;
 653
 654         return err;
 655 }
 656
 657 int ide_wait_cmd (ide_drive_t *drive, u8 cmd, u8 nsect, u8 feature, u8 sectors, u8 *buf)
 658 {
 659         struct request rq;
 660         u8 buffer[4];
 661
 662         if (!buf)
 663                 buf = buffer;
 664         memset(buf, 0, 4 + SECTOR_WORDS * 4 * sectors);
 665         ide_init_drive_cmd(&rq);
 666         rq.buffer = buf;
 667         *buf++ = cmd;
 668         *buf++ = nsect;
 669         *buf++ = feature;
 670         *buf++ = sectors;
 671         return ide_do_drive_cmd(drive, &rq, ide_wait);
 672 }
 673
 674 /*
 675  * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
 676  */
 677 int ide_cmd_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 678 {
 679         int err = 0;
 680         u8 args[4], *argbuf = args;
 681         u8 xfer_rate = 0;
 682         int argsize = 4;
 683         ide_task_t tfargs;
 684
 685         if (NULL == (void *) arg) {
 686                 struct request rq;
 687                 ide_init_drive_cmd(&rq);
 688                 return ide_do_drive_cmd(drive, &rq, ide_wait);
 689         }
 690
 691         if (copy_from_user(args, (void __user *)arg, 4))
 692                 return -EFAULT;
 693
 694         memset(&tfargs, 0, sizeof(ide_task_t));
 695         tfargs.tfRegister[IDE_FEATURE_OFFSET] = args[2];
 696         tfargs.tfRegister[IDE_NSECTOR_OFFSET] = args[3];
 697         tfargs.tfRegister[IDE_SECTOR_OFFSET]  = args[1];
 698         tfargs.tfRegister[IDE_LCYL_OFFSET]    = 0x00;
 699         tfargs.tfRegister[IDE_HCYL_OFFSET]    = 0x00;
 700         tfargs.tfRegister[IDE_SELECT_OFFSET]  = 0x00;
 701         tfargs.tfRegister[IDE_COMMAND_OFFSET] = args[0];
 702
 703         if (args[3]) {
 704                 argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
 705                 argbuf = kzalloc(argsize, GFP_KERNEL);
 706                 if (argbuf == NULL)
 707                         return -ENOMEM;
 708         }
 709         if (set_transfer(drive, &tfargs)) {
 710                 xfer_rate = args[1];
 711                 if (ide_ata66_check(drive, &tfargs))
 712                         goto abort;
 713         }
 714
 715         err = ide_wait_cmd(drive, args[0], args[1], args[2], args[3], argbuf);
 716
 717         if (!err && xfer_rate) {
 718                 /* active-retuning-calls future */
 719                 ide_set_xfer_rate(drive, xfer_rate);
 720                 ide_driveid_update(drive);
 721         }
 722 abort:
 723         if (copy_to_user((void __user *)arg, argbuf, argsize))
 724                 err = -EFAULT;
 725         if (argsize > 4)
 726                 kfree(argbuf);
 727         return err;
 728 }
 729
 730 static int ide_wait_cmd_task(ide_drive_t *drive, u8 *buf)
 731 {
 732         struct request rq;
 733
 734         ide_init_drive_cmd(&rq);
 735         rq.flags = REQ_DRIVE_TASK;
 736         rq.buffer = buf;
 737         return ide_do_drive_cmd(drive, &rq, ide_wait);
 738 }
 739
 740 /*
 741  * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
 742  */
 743 int ide_task_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 744 {
 745         void __user *p = (void __user *)arg;
 746         int err = 0;
 747         u8 args[7], *argbuf = args;
 748         int argsize = 7;
 749
 750         if (copy_from_user(args, p, 7))
 751                 return -EFAULT;
 752         err = ide_wait_cmd_task(drive, argbuf);
 753         if (copy_to_user(p, argbuf, argsize))
 754                 err = -EFAULT;
 755         return err;
 756 }
 757
 758 /*
 759  * NOTICE: This is additions from IBM to provide a discrete interface,
 760  * for selective taskregister access operations.  Nice JOB Klaus!!!
 761  * Glad to be able to work and co-develop this with you and IBM.
 762  */
 763 ide_startstop_t flagged_taskfile (ide_drive_t *drive, ide_task_t *task)
 764 {
 765         ide_hwif_t *hwif        = HWIF(drive);
 766         task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
 767         hob_struct_t *hobfile   = (hob_struct_t *) task->hobRegister;
 768 #if DEBUG_TASKFILE
 769         u8 status;
 770 #endif
 771
 772         if (task->data_phase == TASKFILE_MULTI_IN ||
 773             task->data_phase == TASKFILE_MULTI_OUT) {
 774                 if (!drive->mult_count) {
 775                         printk(KERN_ERR "%s: multimode not set!\n", drive->name);
 776                         return ide_stopped;
 777                 }
 778         }
 779
 780         /*
 781          * (ks) Check taskfile in/out flags.
 782          * If set, then execute as it is defined.
 783          * If not set, then define default settings.
 784          * The default values are:
 785          *      write and read all taskfile registers (except data)
 786          *      write and read the hob registers (sector,nsector,lcyl,hcyl)
 787          */
 788         if (task->tf_out_flags.all == 0) {
 789                 task->tf_out_flags.all = IDE_TASKFILE_STD_OUT_FLAGS;
 790                 if (drive->addressing == 1)
 791                         task->tf_out_flags.all |= (IDE_HOB_STD_OUT_FLAGS << 8);
 792         }
 793
 794         if (task->tf_in_flags.all == 0) {
 795                 task->tf_in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
 796                 if (drive->addressing == 1)
 797                         task->tf_in_flags.all |= (IDE_HOB_STD_IN_FLAGS  << 8);
 798         }
 799
 800         /* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
 801         if (IDE_CONTROL_REG)
 802                 /* clear nIEN */
 803                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 804         SELECT_MASK(drive, 0);
 805
 806 #if DEBUG_TASKFILE
 807         status = hwif->INB(IDE_STATUS_REG);
 808         if (status & 0x80) {
 809                 printk("flagged_taskfile -> Bad status. Status = %02x. wait 100 usec ...\n", status);
 810                 udelay(100);
 811                 status = hwif->INB(IDE_STATUS_REG);
 812                 printk("flagged_taskfile -> Status = %02x\n", status);
 813         }
 814 #endif
 815
 816         if (task->tf_out_flags.b.data) {
 817                 u16 data =  taskfile->data + (hobfile->data << 8);
 818                 hwif->OUTW(data, IDE_DATA_REG);
 819         }
 820
 821         /* (ks) send hob registers first */
 822         if (task->tf_out_flags.b.nsector_hob)
 823                 hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
 824         if (task->tf_out_flags.b.sector_hob)
 825                 hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
 826         if (task->tf_out_flags.b.lcyl_hob)
 827                 hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
 828         if (task->tf_out_flags.b.hcyl_hob)
 829                 hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
 830
 831         /* (ks) Send now the standard registers */
 832         if (task->tf_out_flags.b.error_feature)
 833                 hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
 834         /* refers to number of sectors to transfer */
 835         if (task->tf_out_flags.b.nsector)
 836                 hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
 837         /* refers to sector offset or start sector */
 838         if (task->tf_out_flags.b.sector)
 839                 hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
 840         if (task->tf_out_flags.b.lcyl)
 841                 hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
 842         if (task->tf_out_flags.b.hcyl)
 843                 hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
 844
 845         /*
 846          * (ks) In the flagged taskfile approch, we will use all specified
 847          * registers and the register value will not be changed, except the
 848          * select bit (master/slave) in the drive_head register. We must make
 849          * sure that the desired drive is selected.
 850          */
 851         hwif->OUTB(taskfile->device_head | drive->select.all, IDE_SELECT_REG);
 852         switch(task->data_phase) {
 853
 854                 case TASKFILE_OUT_DMAQ:
 855                 case TASKFILE_OUT_DMA:
 856                 case TASKFILE_IN_DMAQ:
 857                 case TASKFILE_IN_DMA:
 858                         hwif->dma_setup(drive);
 859                         hwif->dma_exec_cmd(drive, taskfile->command);
 860                         hwif->dma_start(drive);
 861                         break;
 862
 863                 default:
 864                         if (task->handler == NULL)
 865                                 return ide_stopped;
 866
 867                         /* Issue the command */
 868                         if (task->prehandler) {
 869                                 hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
 870                                 ndelay(400);    /* FIXME */
 871                                 return task->prehandler(drive, task->rq);
 872                         }
 873                         ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
 874         }
 875
 876         return ide_started;
 877 }