drivers/ide/ide-disk.c

   1 /*
   2  *  linux/drivers/ide/ide-disk.c        Version 1.18    Mar 05, 2003
   3  *
   4  *  Copyright (C) 1994-1998  Linus Torvalds & authors (see below)
   5  *  Copyright (C) 1998-2002  Linux ATA Development
   6  *                              Andre Hedrick <andre@linux-ide.org>
   7  *  Copyright (C) 2003       Red Hat <alan@redhat.com>
   8  */
   9
  10 /*
  11  *  Mostly written by Mark Lord <mlord@pobox.com>
  12  *                and Gadi Oxman <gadio@netvision.net.il>
  13  *                and Andre Hedrick <andre@linux-ide.org>
  14  *
  15  * This is the IDE/ATA disk driver, as evolved from hd.c and ide.c.
  16  *
  17  * Version 1.00         move disk only code from ide.c to ide-disk.c
  18  *                      support optional byte-swapping of all data
  19  * Version 1.01         fix previous byte-swapping code
  20  * Version 1.02         remove ", LBA" from drive identification msgs
  21  * Version 1.03         fix display of id->buf_size for big-endian
  22  * Version 1.04         add /proc configurable settings and S.M.A.R.T support
  23  * Version 1.05         add capacity support for ATA3 >= 8GB
  24  * Version 1.06         get boot-up messages to show full cyl count
  25  * Version 1.07         disable door-locking if it fails
  26  * Version 1.08         fixed CHS/LBA translations for ATA4 > 8GB,
  27  *                      process of adding new ATA4 compliance.
  28  *                      fixed problems in allowing fdisk to see
  29  *                      the entire disk.
  30  * Version 1.09         added increment of rq->sector in ide_multwrite
  31  *                      added UDMA 3/4 reporting
  32  * Version 1.10         request queue changes, Ultra DMA 100
  33  * Version 1.11         added 48-bit lba
  34  * Version 1.12         adding taskfile io access method
  35  * Version 1.13         added standby and flush-cache for notifier
  36  * Version 1.14         added acoustic-wcache
  37  * Version 1.15         convert all calls to ide_raw_taskfile
  38  *                              since args will return register content.
  39  * Version 1.16         added suspend-resume-checkpower
  40  * Version 1.17         do flush on standy, do flush on ATA < ATA6
  41  *                      fix wcache setup.
  42  */
  43
  44 #define IDEDISK_VERSION "1.18"
  45
  46 #undef REALLY_SLOW_IO           /* most systems can safely undef this */
  47
  48 #include <linux/config.h>
  49 #include <linux/module.h>
  50 #include <linux/types.h>
  51 #include <linux/string.h>
  52 #include <linux/kernel.h>
  53 #include <linux/timer.h>
  54 #include <linux/mm.h>
  55 #include <linux/interrupt.h>
  56 #include <linux/major.h>
  57 #include <linux/errno.h>
  58 #include <linux/genhd.h>
  59 #include <linux/slab.h>
  60 #include <linux/delay.h>
  61
  62 #define _IDE_DISK
  63
  64 #include <linux/ide.h>
  65
  66 #include <asm/byteorder.h>
  67 #include <asm/irq.h>
  68 #include <asm/uaccess.h>
  69 #include <asm/io.h>
  70 #include <asm/div64.h>
  71
  72 /* FIXME: some day we shouldn't need to look in here! */
  73
  74 #include "legacy/pdc4030.h"
  75
  76 /*
  77  * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
  78  * value for this drive (from its reported identification information).
  79  *
  80  * Returns:     1 if lba_capacity looks sensible
  81  *              0 otherwise
  82  *
  83  * It is called only once for each drive.
  84  */
  85 static int lba_capacity_is_ok (struct hd_driveid *id)
  86 {
  87         unsigned long lba_sects, chs_sects, head, tail;
  88
  89         /*
  90          * The ATA spec tells large drives to return
  91          * C/H/S = 16383/16/63 independent of their size.
  92          * Some drives can be jumpered to use 15 heads instead of 16.
  93          * Some drives can be jumpered to use 4092 cyls instead of 16383.
  94          */
  95         if ((id->cyls == 16383
  96              || (id->cyls == 4092 && id->cur_cyls == 16383)) &&
  97             id->sectors == 63 &&
  98             (id->heads == 15 || id->heads == 16) &&
  99             (id->lba_capacity >= 16383*63*id->heads))
 100                 return 1;
 101
 102         lba_sects   = id->lba_capacity;
 103         chs_sects   = id->cyls * id->heads * id->sectors;
 104
 105         /* perform a rough sanity check on lba_sects:  within 10% is OK */
 106         if ((lba_sects - chs_sects) < chs_sects/10)
 107                 return 1;
 108
 109         /* some drives have the word order reversed */
 110         head = ((lba_sects >> 16) & 0xffff);
 111         tail = (lba_sects & 0xffff);
 112         lba_sects = (head | (tail << 16));
 113         if ((lba_sects - chs_sects) < chs_sects/10) {
 114                 id->lba_capacity = lba_sects;
 115                 return 1;       /* lba_capacity is (now) good */
 116         }
 117
 118         return 0;       /* lba_capacity value may be bad */
 119 }
 120
 121 static int idedisk_start_tag(ide_drive_t *drive, struct request *rq)
 122 {
 123         unsigned long flags;
 124         int ret = 1;
 125
 126         spin_lock_irqsave(&ide_lock, flags);
 127
 128         if (ata_pending_commands(drive) < drive->queue_depth)
 129                 ret = blk_queue_start_tag(drive->queue, rq);
 130
 131         spin_unlock_irqrestore(&ide_lock, flags);
 132         return ret;
 133 }
 134
 135 #ifndef CONFIG_IDE_TASKFILE_IO
 136
 137 /*
 138  * read_intr() is the handler for disk read/multread interrupts
 139  */
 140 static ide_startstop_t read_intr (ide_drive_t *drive)
 141 {
 142         ide_hwif_t *hwif        = HWIF(drive);
 143         u32 i = 0, nsect        = 0, msect = drive->mult_count;
 144         struct request *rq;
 145         unsigned long flags;
 146         u8 stat;
 147         char *to;
 148
 149         /* new way for dealing with premature shared PCI interrupts */
 150         if (!OK_STAT(stat=hwif->INB(IDE_STATUS_REG),DATA_READY,BAD_R_STAT)) {
 151                 if (stat & (ERR_STAT|DRQ_STAT)) {
 152                         return DRIVER(drive)->error(drive, "read_intr", stat);
 153                 }
 154                 /* no data yet, so wait for another interrupt */
 155                 ide_set_handler(drive, &read_intr, WAIT_CMD, NULL);
 156                 return ide_started;
 157         }
 158
 159 read_next:
 160         rq = HWGROUP(drive)->rq;
 161         if (msect) {
 162                 if ((nsect = rq->current_nr_sectors) > msect)
 163                         nsect = msect;
 164                 msect -= nsect;
 165         } else
 166                 nsect = 1;
 167         to = ide_map_buffer(rq, &flags);
 168         taskfile_input_data(drive, to, nsect * SECTOR_WORDS);
 169 #ifdef DEBUG
 170         printk("%s:  read: sectors(%ld-%ld), buffer=0x%08lx, remaining=%ld\n",
 171                 drive->name, rq->sector, rq->sector+nsect-1,
 172                 (unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
 173 #endif
 174         ide_unmap_buffer(rq, to, &flags);
 175         rq->sector += nsect;
 176         rq->errors = 0;
 177         i = (rq->nr_sectors -= nsect);
 178         if (((long)(rq->current_nr_sectors -= nsect)) <= 0)
 179                 ide_end_request(drive, 1, rq->hard_cur_sectors);
 180         /*
 181          * Another BH Page walker and DATA INTEGRITY Questioned on ERROR.
 182          * If passed back up on multimode read, BAD DATA could be ACKED
 183          * to FILE SYSTEMS above ...
 184          */
 185         if (i > 0) {
 186                 if (msect)
 187                         goto read_next;
 188                 ide_set_handler(drive, &read_intr, WAIT_CMD, NULL);
 189                 return ide_started;
 190         }
 191         return ide_stopped;
 192 }
 193
 194 /*
 195  * write_intr() is the handler for disk write interrupts
 196  */
 197 static ide_startstop_t write_intr (ide_drive_t *drive)
 198 {
 199         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 200         ide_hwif_t *hwif        = HWIF(drive);
 201         struct request *rq      = hwgroup->rq;
 202         u32 i = 0;
 203         u8 stat;
 204
 205         if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG),
 206                         DRIVE_READY, drive->bad_wstat)) {
 207                 printk("%s: write_intr error1: nr_sectors=%ld, stat=0x%02x\n",
 208                         drive->name, rq->nr_sectors, stat);
 209         } else {
 210 #ifdef DEBUG
 211                 printk("%s: write: sector %ld, buffer=0x%08lx, remaining=%ld\n",
 212                         drive->name, rq->sector, (unsigned long) rq->buffer,
 213                         rq->nr_sectors-1);
 214 #endif
 215                 if ((rq->nr_sectors == 1) ^ ((stat & DRQ_STAT) != 0)) {
 216                         rq->sector++;
 217                         rq->errors = 0;
 218                         i = --rq->nr_sectors;
 219                         --rq->current_nr_sectors;
 220                         if (((long)rq->current_nr_sectors) <= 0)
 221                                 ide_end_request(drive, 1, rq->hard_cur_sectors);
 222                         if (i > 0) {
 223                                 unsigned long flags;
 224                                 char *to = ide_map_buffer(rq, &flags);
 225                                 taskfile_output_data(drive, to, SECTOR_WORDS);
 226                                 ide_unmap_buffer(rq, to, &flags);
 227                                 ide_set_handler(drive, &write_intr, WAIT_CMD, NULL);
 228                                 return ide_started;
 229                         }
 230                         return ide_stopped;
 231                 }
 232                 /* the original code did this here (?) */
 233                 return ide_stopped;
 234         }
 235         return DRIVER(drive)->error(drive, "write_intr", stat);
 236 }
 237
 238 /*
 239  * ide_multwrite() transfers a block of up to mcount sectors of data
 240  * to a drive as part of a disk multiple-sector write operation.
 241  *
 242  * Note that we may be called from two contexts - __ide_do_rw_disk() context
 243  * and IRQ context. The IRQ can happen any time after we've output the
 244  * full "mcount" number of sectors, so we must make sure we update the
 245  * state _before_ we output the final part of the data!
 246  *
 247  * The update and return to BH is a BLOCK Layer Fakey to get more data
 248  * to satisfy the hardware atomic segment.  If the hardware atomic segment
 249  * is shorter or smaller than the BH segment then we should be OKAY.
 250  * This is only valid if we can rewind the rq->current_nr_sectors counter.
 251  */
 252 static void ide_multwrite(ide_drive_t *drive, unsigned int mcount)
 253 {
 254         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 255         struct request *rq      = &hwgroup->wrq;
 256
 257         do {
 258                 char *buffer;
 259                 int nsect = rq->current_nr_sectors;
 260                 unsigned long flags;
 261
 262                 if (nsect > mcount)
 263                         nsect = mcount;
 264                 mcount -= nsect;
 265                 buffer = ide_map_buffer(rq, &flags);
 266
 267                 rq->sector += nsect;
 268                 rq->nr_sectors -= nsect;
 269                 rq->current_nr_sectors -= nsect;
 270
 271                 /* Do we move to the next bh after this? */
 272                 if (!rq->current_nr_sectors) {
 273                         struct bio *bio = rq->bio;
 274
 275                         /*
 276                          * only move to next bio, when we have processed
 277                          * all bvecs in this one.
 278                          */
 279                         if (++bio->bi_idx >= bio->bi_vcnt) {
 280                                 bio->bi_idx = bio->bi_vcnt - rq->nr_cbio_segments;
 281                                 bio = bio->bi_next;
 282                         }
 283
 284                         /* end early early we ran out of requests */
 285                         if (!bio) {
 286                                 mcount = 0;
 287                         } else {
 288                                 rq->bio = bio;
 289                                 rq->nr_cbio_segments = bio_segments(bio);
 290                                 rq->current_nr_sectors = bio_cur_sectors(bio);
 291                                 rq->hard_cur_sectors = rq->current_nr_sectors;
 292                         }
 293                 }
 294
 295                 /*
 296                  * Ok, we're all setup for the interrupt
 297                  * re-entering us on the last transfer.
 298                  */
 299                 taskfile_output_data(drive, buffer, nsect<<7);
 300                 ide_unmap_buffer(rq, buffer, &flags);
 301         } while (mcount);
 302 }
 303
 304 /*
 305  * multwrite_intr() is the handler for disk multwrite interrupts
 306  */
 307 static ide_startstop_t multwrite_intr (ide_drive_t *drive)
 308 {
 309         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 310         ide_hwif_t *hwif        = HWIF(drive);
 311         struct request *rq      = &hwgroup->wrq;
 312         struct bio *bio         = rq->bio;
 313         u8 stat;
 314
 315         stat = hwif->INB(IDE_STATUS_REG);
 316         if (OK_STAT(stat, DRIVE_READY, drive->bad_wstat)) {
 317                 if (stat & DRQ_STAT) {
 318                         /*
 319                          *      The drive wants data. Remember rq is the copy
 320                          *      of the request
 321                          */
 322                         if (rq->nr_sectors) {
 323                                 ide_multwrite(drive, drive->mult_count);
 324                                 ide_set_handler(drive, &multwrite_intr, WAIT_CMD, NULL);
 325                                 return ide_started;
 326                         }
 327                 } else {
 328                         /*
 329                          *      If the copy has all the blocks completed then
 330                          *      we can end the original request.
 331                          */
 332                         if (!rq->nr_sectors) {  /* all done? */
 333                                 bio->bi_idx = bio->bi_vcnt - rq->nr_cbio_segments;
 334                                 rq = hwgroup->rq;
 335                                 ide_end_request(drive, 1, rq->nr_sectors);
 336                                 return ide_stopped;
 337                         }
 338                 }
 339                 bio->bi_idx = bio->bi_vcnt - rq->nr_cbio_segments;
 340                 /* the original code did this here (?) */
 341                 return ide_stopped;
 342         }
 343         bio->bi_idx = bio->bi_vcnt - rq->nr_cbio_segments;
 344         return DRIVER(drive)->error(drive, "multwrite_intr", stat);
 345 }
 346
 347 /*
 348  * __ide_do_rw_disk() issues READ and WRITE commands to a disk,
 349  * using LBA if supported, or CHS otherwise, to address sectors.
 350  * It also takes care of issuing special DRIVE_CMDs.
 351  */
 352 ide_startstop_t __ide_do_rw_disk (ide_drive_t *drive, struct request *rq, sector_t block)
 353 {
 354         ide_hwif_t *hwif        = HWIF(drive);
 355         u8 lba48                = (drive->addressing == 1) ? 1 : 0;
 356         task_ioreg_t command    = WIN_NOP;
 357         ata_nsector_t           nsectors;
 358
 359         nsectors.all            = (u16) rq->nr_sectors;
 360
 361         if (drive->using_tcq && idedisk_start_tag(drive, rq)) {
 362                 if (!ata_pending_commands(drive))
 363                         BUG();
 364
 365                 return ide_started;
 366         }
 367
 368         if (IDE_CONTROL_REG)
 369                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 370
 371         if (drive->select.b.lba) {
 372                 if (drive->addressing == 1) {
 373                         task_ioreg_t tasklets[10];
 374
 375                         if (blk_rq_tagged(rq)) {
 376                                 tasklets[0] = nsectors.b.low;
 377                                 tasklets[1] = nsectors.b.high;
 378                                 tasklets[2] = rq->tag << 3;
 379                                 tasklets[3] = 0;
 380                         } else {
 381                                 tasklets[0] = 0;
 382                                 tasklets[1] = 0;
 383                                 tasklets[2] = nsectors.b.low;
 384                                 tasklets[3] = nsectors.b.high;
 385                         }
 386
 387                         tasklets[4] = (task_ioreg_t) block;
 388                         tasklets[5] = (task_ioreg_t) (block>>8);
 389                         tasklets[6] = (task_ioreg_t) (block>>16);
 390                         tasklets[7] = (task_ioreg_t) (block>>24);
 391                         if (sizeof(block) == 4) {
 392                                 tasklets[8] = (task_ioreg_t) 0;
 393                                 tasklets[9] = (task_ioreg_t) 0;
 394                         } else {
 395                                 tasklets[8] = (task_ioreg_t)((u64)block >> 32);
 396                                 tasklets[9] = (task_ioreg_t)((u64)block >> 40);
 397                         }
 398 #ifdef DEBUG
 399                         printk("%s: %sing: LBAsect=%lu, sectors=%ld, "
 400                                 "buffer=0x%08lx, LBAsect=0x%012lx\n",
 401                                 drive->name,
 402                                 rq_data_dir(rq)==READ?"read":"writ",
 403                                 block,
 404                                 rq->nr_sectors,
 405                                 (unsigned long) rq->buffer,
 406                                 block);
 407                         printk("%s: 0x%02x%02x 0x%02x%02x%02x%02x%02x%02x\n",
 408                                 drive->name, tasklets[3], tasklets[2],
 409                                 tasklets[9], tasklets[8], tasklets[7],
 410                                 tasklets[6], tasklets[5], tasklets[4]);
 411 #endif
 412                         hwif->OUTB(tasklets[1], IDE_FEATURE_REG);
 413                         hwif->OUTB(tasklets[3], IDE_NSECTOR_REG);
 414                         hwif->OUTB(tasklets[7], IDE_SECTOR_REG);
 415                         hwif->OUTB(tasklets[8], IDE_LCYL_REG);
 416                         hwif->OUTB(tasklets[9], IDE_HCYL_REG);
 417
 418                         hwif->OUTB(tasklets[0], IDE_FEATURE_REG);
 419                         hwif->OUTB(tasklets[2], IDE_NSECTOR_REG);
 420                         hwif->OUTB(tasklets[4], IDE_SECTOR_REG);
 421                         hwif->OUTB(tasklets[5], IDE_LCYL_REG);
 422                         hwif->OUTB(tasklets[6], IDE_HCYL_REG);
 423                         hwif->OUTB(0x00|drive->select.all,IDE_SELECT_REG);
 424                 } else {
 425 #ifdef DEBUG
 426                         printk("%s: %sing: LBAsect=%llu, sectors=%ld, "
 427                                 "buffer=0x%08lx\n",
 428                                 drive->name,
 429                                 rq_data_dir(rq)==READ?"read":"writ",
 430                                 (unsigned long long)block, rq->nr_sectors,
 431                                 (unsigned long) rq->buffer);
 432 #endif
 433                         if (blk_rq_tagged(rq)) {
 434                                 hwif->OUTB(nsectors.b.low, IDE_FEATURE_REG);
 435                                 hwif->OUTB(rq->tag << 3, IDE_NSECTOR_REG);
 436                         } else {
 437                                 hwif->OUTB(0x00, IDE_FEATURE_REG);
 438                                 hwif->OUTB(nsectors.b.low, IDE_NSECTOR_REG);
 439                         }
 440
 441                         hwif->OUTB(block, IDE_SECTOR_REG);
 442                         hwif->OUTB(block>>=8, IDE_LCYL_REG);
 443                         hwif->OUTB(block>>=8, IDE_HCYL_REG);
 444                         hwif->OUTB(((block>>8)&0x0f)|drive->select.all,IDE_SELECT_REG);
 445                 }
 446         } else {
 447                 unsigned int sect,head,cyl,track;
 448                 track = (int)block / drive->sect;
 449                 sect  = (int)block % drive->sect + 1;
 450                 hwif->OUTB(sect, IDE_SECTOR_REG);
 451                 head  = track % drive->head;
 452                 cyl   = track / drive->head;
 453
 454                 if (blk_rq_tagged(rq)) {
 455                         hwif->OUTB(nsectors.b.low, IDE_FEATURE_REG);
 456                         hwif->OUTB(rq->tag << 3, IDE_NSECTOR_REG);
 457                 } else {
 458                         hwif->OUTB(0x00, IDE_FEATURE_REG);
 459                         hwif->OUTB(nsectors.b.low, IDE_NSECTOR_REG);
 460                 }
 461
 462                 hwif->OUTB(cyl, IDE_LCYL_REG);
 463                 hwif->OUTB(cyl>>8, IDE_HCYL_REG);
 464                 hwif->OUTB(head|drive->select.all,IDE_SELECT_REG);
 465 #ifdef DEBUG
 466                 printk("%s: %sing: CHS=%d/%d/%d, sectors=%ld, buffer=0x%08lx\n",
 467                         drive->name, rq_data_dir(rq)==READ?"read":"writ", cyl,
 468                         head, sect, rq->nr_sectors, (unsigned long) rq->buffer);
 469 #endif
 470         }
 471
 472         if (rq_data_dir(rq) == READ) {
 473 #ifdef CONFIG_BLK_DEV_IDE_TCQ
 474                 if (blk_rq_tagged(rq))
 475                         return __ide_dma_queued_read(drive);
 476 #endif
 477                 if (drive->using_dma && !hwif->ide_dma_read(drive))
 478                         return ide_started;
 479
 480                 command = ((drive->mult_count) ?
 481                            ((lba48) ? WIN_MULTREAD_EXT : WIN_MULTREAD) :
 482                            ((lba48) ? WIN_READ_EXT : WIN_READ));
 483                 ide_execute_command(drive, command, &read_intr, WAIT_CMD, NULL);
 484                 return ide_started;
 485         } else if (rq_data_dir(rq) == WRITE) {
 486                 ide_startstop_t startstop;
 487 #ifdef CONFIG_BLK_DEV_IDE_TCQ
 488                 if (blk_rq_tagged(rq))
 489                         return __ide_dma_queued_write(drive);
 490 #endif
 491                 if (drive->using_dma && !(HWIF(drive)->ide_dma_write(drive)))
 492                         return ide_started;
 493
 494                 command = ((drive->mult_count) ?
 495                            ((lba48) ? WIN_MULTWRITE_EXT : WIN_MULTWRITE) :
 496                            ((lba48) ? WIN_WRITE_EXT : WIN_WRITE));
 497                 hwif->OUTB(command, IDE_COMMAND_REG);
 498
 499                 if (ide_wait_stat(&startstop, drive, DATA_READY,
 500                                 drive->bad_wstat, WAIT_DRQ)) {
 501                         printk(KERN_ERR "%s: no DRQ after issuing %s\n",
 502                                 drive->name,
 503                                 drive->mult_count ? "MULTWRITE" : "WRITE");
 504                         return startstop;
 505                 }
 506                 if (!drive->unmask)
 507                         local_irq_disable();
 508                 if (drive->mult_count) {
 509                         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 510
 511                         hwgroup->wrq = *rq; /* scratchpad */
 512                         ide_set_handler(drive, &multwrite_intr, WAIT_CMD, NULL);
 513                         ide_multwrite(drive, drive->mult_count);
 514                 } else {
 515                         unsigned long flags;
 516                         char *to = ide_map_buffer(rq, &flags);
 517                         ide_set_handler(drive, &write_intr, WAIT_CMD, NULL);
 518                         taskfile_output_data(drive, to, SECTOR_WORDS);
 519                         ide_unmap_buffer(rq, to, &flags);
 520                 }
 521                 return ide_started;
 522         }
 523         blk_dump_rq_flags(rq, "__ide_do_rw_disk - bad command");
 524         ide_end_request(drive, 0, 0);
 525         return ide_stopped;
 526 }
 527 EXPORT_SYMBOL_GPL(__ide_do_rw_disk);
 528
 529 #else /* CONFIG_IDE_TASKFILE_IO */
 530
 531 static ide_startstop_t chs_rw_disk(ide_drive_t *, struct request *, unsigned long);
 532 static ide_startstop_t lba_28_rw_disk(ide_drive_t *, struct request *, unsigned long);
 533 static ide_startstop_t lba_48_rw_disk(ide_drive_t *, struct request *, unsigned long long);
 534
 535 /*
 536  * __ide_do_rw_disk() issues READ and WRITE commands to a disk,
 537  * using LBA if supported, or CHS otherwise, to address sectors.
 538  * It also takes care of issuing special DRIVE_CMDs.
 539  */
 540 ide_startstop_t __ide_do_rw_disk (ide_drive_t *drive, struct request *rq, sector_t block)
 541 {
 542         BUG_ON(drive->blocked);
 543         if (!blk_fs_request(rq)) {
 544                 blk_dump_rq_flags(rq, "__ide_do_rw_disk - bad command");
 545                 ide_end_request(drive, 0, 0);
 546                 return ide_stopped;
 547         }
 548
 549         /*
 550          * 268435455  == 137439 MB or 28bit limit
 551          *
 552          * need to add split taskfile operations based on 28bit threshold.
 553          */
 554
 555         if (drive->using_tcq && idedisk_start_tag(drive, rq)) {
 556                 if (!ata_pending_commands(drive))
 557                         BUG();
 558
 559                 return ide_started;
 560         }
 561
 562         if (drive->addressing == 1)             /* 48-bit LBA */
 563                 return lba_48_rw_disk(drive, rq, (unsigned long long) block);
 564         if (drive->select.b.lba)                /* 28-bit LBA */
 565                 return lba_28_rw_disk(drive, rq, (unsigned long) block);
 566
 567         /* 28-bit CHS : DIE DIE DIE piece of legacy crap!!! */
 568         return chs_rw_disk(drive, rq, (unsigned long) block);
 569 }
 570 EXPORT_SYMBOL_GPL(__ide_do_rw_disk);
 571
 572 static task_ioreg_t get_command (ide_drive_t *drive, int cmd)
 573 {
 574         int lba48bit = (drive->addressing == 1) ? 1 : 0;
 575
 576         if ((cmd == READ) && drive->using_tcq)
 577                 return lba48bit ? WIN_READDMA_QUEUED_EXT : WIN_READDMA_QUEUED;
 578         if ((cmd == READ) && (drive->using_dma))
 579                 return (lba48bit) ? WIN_READDMA_EXT : WIN_READDMA;
 580         else if ((cmd == READ) && (drive->mult_count))
 581                 return (lba48bit) ? WIN_MULTREAD_EXT : WIN_MULTREAD;
 582         else if (cmd == READ)
 583                 return (lba48bit) ? WIN_READ_EXT : WIN_READ;
 584         else if ((cmd == WRITE) && drive->using_tcq)
 585                 return lba48bit ? WIN_WRITEDMA_QUEUED_EXT : WIN_WRITEDMA_QUEUED;
 586         else if ((cmd == WRITE) && (drive->using_dma))
 587                 return (lba48bit) ? WIN_WRITEDMA_EXT : WIN_WRITEDMA;
 588         else if ((cmd == WRITE) && (drive->mult_count))
 589                 return (lba48bit) ? WIN_MULTWRITE_EXT : WIN_MULTWRITE;
 590         else if (cmd == WRITE)
 591                 return (lba48bit) ? WIN_WRITE_EXT : WIN_WRITE;
 592         else
 593                 return WIN_NOP;
 594 }
 595
 596 static ide_startstop_t chs_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
 597 {
 598         ide_task_t              args;
 599         int                     sectors;
 600         ata_nsector_t           nsectors;
 601         task_ioreg_t command    = get_command(drive, rq_data_dir(rq));
 602         unsigned int track      = (block / drive->sect);
 603         unsigned int sect       = (block % drive->sect) + 1;
 604         unsigned int head       = (track % drive->head);
 605         unsigned int cyl        = (track / drive->head);
 606
 607         nsectors.all = (u16) rq->nr_sectors;
 608
 609 #ifdef DEBUG
 610         printk("%s: %sing: ", drive->name, (rq_data_dir(rq)==READ) ? "read" : "writ");
 611         printk("CHS=%d/%d/%d, ", cyl, head, sect);
 612         printk("sectors=%ld, ", rq->nr_sectors);
 613         printk("buffer=0x%08lx\n", (unsigned long) rq->buffer);
 614 #endif
 615
 616         memset(&args, 0, sizeof(ide_task_t));
 617
 618         sectors = (rq->nr_sectors == 256) ? 0x00 : rq->nr_sectors;
 619
 620         if (blk_rq_tagged(rq)) {
 621                 args.tfRegister[IDE_FEATURE_OFFSET] = sectors;
 622                 args.tfRegister[IDE_NSECTOR_OFFSET] = rq->tag << 3;
 623         } else
 624                 args.tfRegister[IDE_NSECTOR_OFFSET] = sectors;
 625
 626         args.tfRegister[IDE_SECTOR_OFFSET]      = sect;
 627         args.tfRegister[IDE_LCYL_OFFSET]        = cyl;
 628         args.tfRegister[IDE_HCYL_OFFSET]        = (cyl>>8);
 629         args.tfRegister[IDE_SELECT_OFFSET]      = head;
 630         args.tfRegister[IDE_SELECT_OFFSET]      |= drive->select.all;
 631         args.tfRegister[IDE_COMMAND_OFFSET]     = command;
 632         args.command_type                       = ide_cmd_type_parser(&args);
 633         args.rq                                 = (struct request *) rq;
 634         rq->special                             = (ide_task_t *)&args;
 635         return do_rw_taskfile(drive, &args);
 636 }
 637
 638 static ide_startstop_t lba_28_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
 639 {
 640         ide_task_t              args;
 641         int                     sectors;
 642         ata_nsector_t           nsectors;
 643         task_ioreg_t command    = get_command(drive, rq_data_dir(rq));
 644
 645         nsectors.all = (u16) rq->nr_sectors;
 646
 647 #ifdef DEBUG
 648         printk("%s: %sing: ", drive->name, (rq_data_dir(rq)==READ) ? "read" : "writ");
 649         printk("LBAsect=%lld, ", block);
 650         printk("sectors=%ld, ", rq->nr_sectors);
 651         printk("buffer=0x%08lx\n", (unsigned long) rq->buffer);
 652 #endif
 653
 654         memset(&args, 0, sizeof(ide_task_t));
 655
 656         sectors = (rq->nr_sectors == 256) ? 0x00 : rq->nr_sectors;
 657
 658         if (blk_rq_tagged(rq)) {
 659                 args.tfRegister[IDE_FEATURE_OFFSET] = sectors;
 660                 args.tfRegister[IDE_NSECTOR_OFFSET] = rq->tag << 3;
 661         } else
 662                 args.tfRegister[IDE_NSECTOR_OFFSET] = sectors;
 663
 664         args.tfRegister[IDE_SECTOR_OFFSET]      = block;
 665         args.tfRegister[IDE_LCYL_OFFSET]        = (block>>=8);
 666         args.tfRegister[IDE_HCYL_OFFSET]        = (block>>=8);
 667         args.tfRegister[IDE_SELECT_OFFSET]      = ((block>>8)&0x0f);
 668         args.tfRegister[IDE_SELECT_OFFSET]      |= drive->select.all;
 669         args.tfRegister[IDE_COMMAND_OFFSET]     = command;
 670         args.command_type                       = ide_cmd_type_parser(&args);
 671         args.rq                                 = (struct request *) rq;
 672         rq->special                             = (ide_task_t *)&args;
 673         return do_rw_taskfile(drive, &args);
 674 }
 675
 676 /*
 677  * 268435455  == 137439 MB or 28bit limit
 678  * 320173056  == 163929 MB or 48bit addressing
 679  * 1073741822 == 549756 MB or 48bit addressing fake drive
 680  */
 681
 682 static ide_startstop_t lba_48_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long long block)
 683 {
 684         ide_task_t              args;
 685         int                     sectors;
 686         ata_nsector_t           nsectors;
 687         task_ioreg_t command    = get_command(drive, rq_data_dir(rq));
 688
 689         nsectors.all = (u16) rq->nr_sectors;
 690
 691 #ifdef DEBUG
 692         printk("%s: %sing: ", drive->name, (rq_data_dir(rq)==READ) ? "read" : "writ");
 693         printk("LBAsect=%lld, ", block);
 694         printk("sectors=%ld, ", rq->nr_sectors);
 695         printk("buffer=0x%08lx\n", (unsigned long) rq->buffer);
 696 #endif
 697
 698         memset(&args, 0, sizeof(ide_task_t));
 699
 700         sectors = (rq->nr_sectors == 65536) ? 0 : rq->nr_sectors;
 701
 702         if (blk_rq_tagged(rq)) {
 703                 args.tfRegister[IDE_FEATURE_OFFSET] = sectors;
 704                 args.tfRegister[IDE_NSECTOR_OFFSET] = rq->tag << 3;
 705                 args.hobRegister[IDE_FEATURE_OFFSET_HOB] = sectors >> 8;
 706                 args.hobRegister[IDE_NSECTOR_OFFSET_HOB] = 0;
 707         } else {
 708                 args.tfRegister[IDE_NSECTOR_OFFSET] = sectors;
 709                 args.hobRegister[IDE_NSECTOR_OFFSET_HOB] = sectors >> 8;
 710         }
 711
 712         args.tfRegister[IDE_SECTOR_OFFSET]      = block;        /* low lba */
 713         args.tfRegister[IDE_LCYL_OFFSET]        = (block>>=8);  /* mid lba */
 714         args.tfRegister[IDE_HCYL_OFFSET]        = (block>>=8);  /* hi  lba */
 715         args.tfRegister[IDE_SELECT_OFFSET]      = drive->select.all;
 716         args.tfRegister[IDE_COMMAND_OFFSET]     = command;
 717         args.hobRegister[IDE_SECTOR_OFFSET_HOB] = (block>>=8);  /* low lba */
 718         args.hobRegister[IDE_LCYL_OFFSET_HOB]   = (block>>=8);  /* mid lba */
 719         args.hobRegister[IDE_HCYL_OFFSET_HOB]   = (block>>=8);  /* hi  lba */
 720         args.hobRegister[IDE_SELECT_OFFSET_HOB] = drive->select.all;
 721         args.hobRegister[IDE_CONTROL_OFFSET_HOB]= (drive->ctl|0x80);
 722         args.command_type                       = ide_cmd_type_parser(&args);
 723         args.rq                                 = (struct request *) rq;
 724         rq->special                             = (ide_task_t *)&args;
 725         return do_rw_taskfile(drive, &args);
 726 }
 727
 728 #endif /* CONFIG_IDE_TASKFILE_IO */
 729
 730 static ide_startstop_t ide_do_rw_disk (ide_drive_t *drive, struct request *rq, sector_t block)
 731 {
 732         ide_hwif_t *hwif = HWIF(drive);
 733
 734         if (hwif->rw_disk)
 735                 return hwif->rw_disk(drive, rq, block);
 736         else
 737                 return __ide_do_rw_disk(drive, rq, block);
 738 }
 739
 740 static int do_idedisk_flushcache(ide_drive_t *drive);
 741
 742 static u8 idedisk_dump_status (ide_drive_t *drive, const char *msg, u8 stat)
 743 {
 744         ide_hwif_t *hwif = HWIF(drive);
 745         unsigned long flags;
 746         u8 err = 0;
 747
 748         local_irq_set(flags);
 749         printk("%s: %s: status=0x%02x", drive->name, msg, stat);
 750 #if FANCY_STATUS_DUMPS
 751         printk(" { ");
 752         if (stat & BUSY_STAT)
 753                 printk("Busy ");
 754         else {
 755                 if (stat & READY_STAT)  printk("DriveReady ");
 756                 if (stat & WRERR_STAT)  printk("DeviceFault ");
 757                 if (stat & SEEK_STAT)   printk("SeekComplete ");
 758                 if (stat & DRQ_STAT)    printk("DataRequest ");
 759                 if (stat & ECC_STAT)    printk("CorrectedError ");
 760                 if (stat & INDEX_STAT)  printk("Index ");
 761                 if (stat & ERR_STAT)    printk("Error ");
 762         }
 763         printk("}");
 764 #endif  /* FANCY_STATUS_DUMPS */
 765         printk("\n");
 766         if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
 767                 err = hwif->INB(IDE_ERROR_REG);
 768                 printk("%s: %s: error=0x%02x", drive->name, msg, err);
 769 #if FANCY_STATUS_DUMPS
 770                 printk(" { ");
 771                 if (err & ABRT_ERR)     printk("DriveStatusError ");
 772                 if (err & ICRC_ERR)
 773                         printk("Bad%s ", (err & ABRT_ERR) ? "CRC" : "Sector");
 774                 if (err & ECC_ERR)      printk("UncorrectableError ");
 775                 if (err & ID_ERR)       printk("SectorIdNotFound ");
 776                 if (err & TRK0_ERR)     printk("TrackZeroNotFound ");
 777                 if (err & MARK_ERR)     printk("AddrMarkNotFound ");
 778                 printk("}");
 779                 if ((err & (BBD_ERR | ABRT_ERR)) == BBD_ERR ||
 780                     (err & (ECC_ERR|ID_ERR|MARK_ERR))) {
 781                         if (drive->addressing == 1) {
 782                                 __u64 sectors = 0;
 783                                 u32 low = 0, high = 0;
 784                                 low = ide_read_24(drive);
 785                                 hwif->OUTB(drive->ctl|0x80, IDE_CONTROL_REG);
 786                                 high = ide_read_24(drive);
 787                                 sectors = ((__u64)high << 24) | low;
 788                                 printk(", LBAsect=%llu, high=%d, low=%d",
 789                                        (unsigned long long) sectors,
 790                                        high, low);
 791                         } else {
 792                                 u8 cur = hwif->INB(IDE_SELECT_REG);
 793                                 if (cur & 0x40) {       /* using LBA? */
 794                                         printk(", LBAsect=%ld", (unsigned long)
 795                                          ((cur&0xf)<<24)
 796                                          |(hwif->INB(IDE_HCYL_REG)<<16)
 797                                          |(hwif->INB(IDE_LCYL_REG)<<8)
 798                                          | hwif->INB(IDE_SECTOR_REG));
 799                                 } else {
 800                                         printk(", CHS=%d/%d/%d",
 801                                          (hwif->INB(IDE_HCYL_REG)<<8) +
 802                                           hwif->INB(IDE_LCYL_REG),
 803                                           cur & 0xf,
 804                                           hwif->INB(IDE_SECTOR_REG));
 805                                 }
 806                         }
 807                         if (HWGROUP(drive) && HWGROUP(drive)->rq)
 808                                 printk(", sector=%llu",
 809                                         (unsigned long long)HWGROUP(drive)->rq->sector);
 810                 }
 811         }
 812 #endif  /* FANCY_STATUS_DUMPS */
 813         printk("\n");
 814         local_irq_restore(flags);
 815         return err;
 816 }
 817
 818 ide_startstop_t idedisk_error (ide_drive_t *drive, const char *msg, u8 stat)
 819 {
 820         ide_hwif_t *hwif;
 821         struct request *rq;
 822         u8 err;
 823         int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
 824
 825         err = idedisk_dump_status(drive, msg, stat);
 826
 827         if (drive == NULL || (rq = HWGROUP(drive)->rq) == NULL)
 828                 return ide_stopped;
 829
 830         hwif = HWIF(drive);
 831         /* retry only "normal" I/O: */
 832         if (rq->flags & (REQ_DRIVE_CMD | REQ_DRIVE_TASK | REQ_DRIVE_TASKFILE)) {
 833                 rq->errors = 1;
 834                 ide_end_drive_cmd(drive, stat, err);
 835                 return ide_stopped;
 836         }
 837 #ifdef CONFIG_IDE_TASKFILE_IO
 838         /* make rq completion pointers new submission pointers */
 839         blk_rq_prep_restart(rq);
 840 #endif
 841
 842         if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) {
 843                 /* other bits are useless when BUSY */
 844                 rq->errors |= ERROR_RESET;
 845         } else if (stat & ERR_STAT) {
 846                 /* err has different meaning on cdrom and tape */
 847                 if (err == ABRT_ERR) {
 848                         if (drive->select.b.lba &&
 849                             /* some newer drives don't support WIN_SPECIFY */
 850                             hwif->INB(IDE_COMMAND_REG) == WIN_SPECIFY)
 851                                 return ide_stopped;
 852                 } else if ((err & BAD_CRC) == BAD_CRC) {
 853                         /* UDMA crc error, just retry the operation */
 854                         drive->crc_count++;
 855                 } else if (err & (BBD_ERR | ECC_ERR)) {
 856                         /* retries won't help these */
 857                         rq->errors = ERROR_MAX;
 858                 } else if (err & TRK0_ERR) {
 859                         /* help it find track zero */
 860                         rq->errors |= ERROR_RECAL;
 861                 }
 862         }
 863         if ((stat & DRQ_STAT) && rq_data_dir(rq) == READ) {
 864                 /*
 865                  * try_to_flush_leftover_data() is invoked in response to
 866                  * a drive unexpectedly having its DRQ_STAT bit set.  As
 867                  * an alternative to resetting the drive, this routine
 868                  * tries to clear the condition by read a sector's worth
 869                  * of data from the drive.  Of course, this may not help
 870                  * if the drive is *waiting* for data from *us*.
 871                  */
 872                 while (i > 0) {
 873                         u32 buffer[16];
 874                         unsigned int wcount = (i > 16) ? 16 : i;
 875                         i -= wcount;
 876                         taskfile_input_data(drive, buffer, wcount);
 877                 }
 878         }
 879         if (hwif->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT)) {
 880                 /* force an abort */
 881                 hwif->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
 882         }
 883         if (rq->errors >= ERROR_MAX || blk_noretry_request(rq))
 884                 DRIVER(drive)->end_request(drive, 0, 0);
 885         else {
 886                 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
 887                         ++rq->errors;
 888                         return ide_do_reset(drive);
 889                 }
 890                 if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
 891                         drive->special.b.recalibrate = 1;
 892                 ++rq->errors;
 893         }
 894         return ide_stopped;
 895 }
 896
 897 ide_startstop_t idedisk_abort(ide_drive_t *drive, const char *msg)
 898 {
 899         ide_hwif_t *hwif;
 900         struct request *rq;
 901
 902         if (drive == NULL || (rq = HWGROUP(drive)->rq) == NULL)
 903                 return ide_stopped;
 904
 905         hwif = HWIF(drive);
 906
 907         if (rq->flags & (REQ_DRIVE_CMD | REQ_DRIVE_TASK | REQ_DRIVE_TASKFILE)) {
 908                 rq->errors = 1;
 909                 ide_end_drive_cmd(drive, BUSY_STAT, 0);
 910                 return ide_stopped;
 911         }
 912
 913         DRIVER(drive)->end_request(drive, 0, 0);
 914         return ide_stopped;
 915 }
 916
 917 /*
 918  * Queries for true maximum capacity of the drive.
 919  * Returns maximum LBA address (> 0) of the drive, 0 if failed.
 920  */
 921 static unsigned long idedisk_read_native_max_address(ide_drive_t *drive)
 922 {
 923         ide_task_t args;
 924         unsigned long addr = 0;
 925
 926         /* Create IDE/ATA command request structure */
 927         memset(&args, 0, sizeof(ide_task_t));
 928         args.tfRegister[IDE_SELECT_OFFSET]      = 0x40;
 929         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_READ_NATIVE_MAX;
 930         args.command_type                       = ide_cmd_type_parser(&args);
 931         /* submit command request */
 932         ide_raw_taskfile(drive, &args, NULL);
 933
 934         /* if OK, compute maximum address value */
 935         if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
 936                 addr = ((args.tfRegister[IDE_SELECT_OFFSET] & 0x0f) << 24)
 937                      | ((args.tfRegister[  IDE_HCYL_OFFSET]       ) << 16)
 938                      | ((args.tfRegister[  IDE_LCYL_OFFSET]       ) <<  8)
 939                      | ((args.tfRegister[IDE_SECTOR_OFFSET]       ));
 940                 addr++; /* since the return value is (maxlba - 1), we add 1 */
 941         }
 942         return addr;
 943 }
 944
 945 static unsigned long long idedisk_read_native_max_address_ext(ide_drive_t *drive)
 946 {
 947         ide_task_t args;
 948         unsigned long long addr = 0;
 949
 950         /* Create IDE/ATA command request structure */
 951         memset(&args, 0, sizeof(ide_task_t));
 952
 953         args.tfRegister[IDE_SELECT_OFFSET]      = 0x40;
 954         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_READ_NATIVE_MAX_EXT;
 955         args.command_type                       = ide_cmd_type_parser(&args);
 956         /* submit command request */
 957         ide_raw_taskfile(drive, &args, NULL);
 958
 959         /* if OK, compute maximum address value */
 960         if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
 961                 u32 high = ((args.hobRegister[IDE_HCYL_OFFSET_HOB])<<16) |
 962                            ((args.hobRegister[IDE_LCYL_OFFSET_HOB])<<8) |
 963                             (args.hobRegister[IDE_SECTOR_OFFSET_HOB]);
 964                 u32 low  = ((args.tfRegister[IDE_HCYL_OFFSET])<<16) |
 965                            ((args.tfRegister[IDE_LCYL_OFFSET])<<8) |
 966                             (args.tfRegister[IDE_SECTOR_OFFSET]);
 967                 addr = ((__u64)high << 24) | low;
 968                 addr++; /* since the return value is (maxlba - 1), we add 1 */
 969         }
 970         return addr;
 971 }
 972
 973 #ifdef CONFIG_IDEDISK_STROKE
 974 /*
 975  * Sets maximum virtual LBA address of the drive.
 976  * Returns new maximum virtual LBA address (> 0) or 0 on failure.
 977  */
 978 static unsigned long idedisk_set_max_address(ide_drive_t *drive, unsigned long addr_req)
 979 {
 980         ide_task_t args;
 981         unsigned long addr_set = 0;
 982
 983         addr_req--;
 984         /* Create IDE/ATA command request structure */
 985         memset(&args, 0, sizeof(ide_task_t));
 986         args.tfRegister[IDE_SECTOR_OFFSET]      = ((addr_req >>  0) & 0xff);
 987         args.tfRegister[IDE_LCYL_OFFSET]        = ((addr_req >>  8) & 0xff);
 988         args.tfRegister[IDE_HCYL_OFFSET]        = ((addr_req >> 16) & 0xff);
 989         args.tfRegister[IDE_SELECT_OFFSET]      = ((addr_req >> 24) & 0x0f) | 0x40;
 990         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SET_MAX;
 991         args.command_type                       = ide_cmd_type_parser(&args);
 992         /* submit command request */
 993         ide_raw_taskfile(drive, &args, NULL);
 994         /* if OK, read new maximum address value */
 995         if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
 996                 addr_set = ((args.tfRegister[IDE_SELECT_OFFSET] & 0x0f) << 24)
 997                          | ((args.tfRegister[  IDE_HCYL_OFFSET]       ) << 16)
 998                          | ((args.tfRegister[  IDE_LCYL_OFFSET]       ) <<  8)
 999                          | ((args.tfRegister[IDE_SECTOR_OFFSET]       ));
1000                 addr_set++;
1001         }
1002         return addr_set;
1003 }
1004
1005 static unsigned long long idedisk_set_max_address_ext(ide_drive_t *drive, unsigned long long addr_req)
1006 {
1007         ide_task_t args;
1008         unsigned long long addr_set = 0;
1009
1010         addr_req--;
1011         /* Create IDE/ATA command request structure */
1012         memset(&args, 0, sizeof(ide_task_t));
1013         args.tfRegister[IDE_SECTOR_OFFSET]      = ((addr_req >>  0) & 0xff);
1014         args.tfRegister[IDE_LCYL_OFFSET]        = ((addr_req >>= 8) & 0xff);
1015         args.tfRegister[IDE_HCYL_OFFSET]        = ((addr_req >>= 8) & 0xff);
1016         args.tfRegister[IDE_SELECT_OFFSET]      = 0x40;
1017         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SET_MAX_EXT;
1018         args.hobRegister[IDE_SECTOR_OFFSET_HOB] = ((addr_req >>= 8) & 0xff);
1019         args.hobRegister[IDE_LCYL_OFFSET_HOB]   = ((addr_req >>= 8) & 0xff);
1020         args.hobRegister[IDE_HCYL_OFFSET_HOB]   = ((addr_req >>= 8) & 0xff);
1021         args.hobRegister[IDE_SELECT_OFFSET_HOB] = 0x40;
1022         args.hobRegister[IDE_CONTROL_OFFSET_HOB]= (drive->ctl|0x80);
1023         args.command_type                       = ide_cmd_type_parser(&args);
1024         /* submit command request */
1025         ide_raw_taskfile(drive, &args, NULL);
1026         /* if OK, compute maximum address value */
1027         if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
1028                 u32 high = ((args.hobRegister[IDE_HCYL_OFFSET_HOB])<<16) |
1029                            ((args.hobRegister[IDE_LCYL_OFFSET_HOB])<<8) |
1030                             (args.hobRegister[IDE_SECTOR_OFFSET_HOB]);
1031                 u32 low  = ((args.tfRegister[IDE_HCYL_OFFSET])<<16) |
1032                            ((args.tfRegister[IDE_LCYL_OFFSET])<<8) |
1033                             (args.tfRegister[IDE_SECTOR_OFFSET]);
1034                 addr_set = ((__u64)high << 24) | low;
1035                 addr_set++;
1036         }
1037         return addr_set;
1038 }
1039
1040 #endif /* CONFIG_IDEDISK_STROKE */
1041
1042 static unsigned long long sectors_to_MB(unsigned long long n)
1043 {
1044         n <<= 9;                /* make it bytes */
1045         do_div(n, 1000000);     /* make it MB */
1046         return n;
1047 }
1048
1049 /*
1050  * Bits 10 of command_set_1 and cfs_enable_1 must be equal,
1051  * so on non-buggy drives we need test only one.
1052  * However, we should also check whether these fields are valid.
1053  */
1054 static inline int idedisk_supports_hpa(const struct hd_driveid *id)
1055 {
1056         return (id->command_set_1 & 0x0400) && (id->cfs_enable_1 & 0x0400);
1057 }
1058
1059 /*
1060  * The same here.
1061  */
1062 static inline int idedisk_supports_lba48(const struct hd_driveid *id)
1063 {
1064         return (id->command_set_2 & 0x0400) && (id->cfs_enable_2 & 0x0400);
1065 }
1066
1067 static inline void idedisk_check_hpa(ide_drive_t *drive)
1068 {
1069         unsigned long long capacity, set_max;
1070         int lba48 = idedisk_supports_lba48(drive->id);
1071
1072         capacity = drive->capacity64;
1073         if (lba48)
1074                 set_max = idedisk_read_native_max_address_ext(drive);
1075         else
1076                 set_max = idedisk_read_native_max_address(drive);
1077
1078         if (set_max <= capacity)
1079                 return;
1080
1081         printk(KERN_INFO "%s: Host Protected Area detected.\n"
1082                          "\tcurrent capacity is %llu sectors (%llu MB)\n"
1083                          "\tnative  capacity is %llu sectors (%llu MB)\n",
1084                          drive->name,
1085                          capacity, sectors_to_MB(capacity),
1086                          set_max, sectors_to_MB(set_max));
1087 #ifdef CONFIG_IDEDISK_STROKE
1088         if (lba48)
1089                 set_max = idedisk_set_max_address_ext(drive, set_max);
1090         else
1091                 set_max = idedisk_set_max_address(drive, set_max);
1092         if (set_max) {
1093                 drive->capacity64 = set_max;
1094                 printk(KERN_INFO "%s: Host Protected Area disabled.\n",
1095                                  drive->name);
1096         }
1097 #endif
1098 }
1099
1100 /*
1101  * Compute drive->capacity, the full capacity of the drive
1102  * Called with drive->id != NULL.
1103  *
1104  * To compute capacity, this uses either of
1105  *
1106  *    1. CHS value set by user       (whatever user sets will be trusted)
1107  *    2. LBA value from target drive (require new ATA feature)
1108  *    3. LBA value from system BIOS  (new one is OK, old one may break)
1109  *    4. CHS value from system BIOS  (traditional style)
1110  *
1111  * in above order (i.e., if value of higher priority is available,
1112  * reset will be ignored).
1113  */
1114 static void init_idedisk_capacity (ide_drive_t  *drive)
1115 {
1116         struct hd_driveid *id = drive->id;
1117         /*
1118          * If this drive supports the Host Protected Area feature set,
1119          * then we may need to change our opinion about the drive's capacity.
1120          */
1121         int hpa = idedisk_supports_hpa(id);
1122
1123         if (idedisk_supports_lba48(id)) {
1124                 /* drive speaks 48-bit LBA */
1125                 drive->select.b.lba = 1;
1126                 drive->capacity64 = id->lba_capacity_2;
1127                 if (hpa)
1128                         idedisk_check_hpa(drive);
1129         } else if ((id->capability & 2) && lba_capacity_is_ok(id)) {
1130                 /* drive speaks 28-bit LBA */
1131                 drive->select.b.lba = 1;
1132                 drive->capacity64 = id->lba_capacity;
1133                 if (hpa)
1134                         idedisk_check_hpa(drive);
1135         } else {
1136                 /* drive speaks boring old 28-bit CHS */
1137                 drive->capacity64 = drive->cyl * drive->head * drive->sect;
1138         }
1139 }
1140
1141 static sector_t idedisk_capacity (ide_drive_t *drive)
1142 {
1143         return drive->capacity64 - drive->sect0;
1144 }
1145
1146 static ide_startstop_t idedisk_special (ide_drive_t *drive)
1147 {
1148         special_t *s = &drive->special;
1149
1150         if (s->b.set_geometry) {
1151                 s->b.set_geometry       = 0;
1152                 if (!IS_PDC4030_DRIVE) {
1153                         ide_task_t args;
1154                         memset(&args, 0, sizeof(ide_task_t));
1155                         args.tfRegister[IDE_NSECTOR_OFFSET] = drive->sect;
1156                         args.tfRegister[IDE_SECTOR_OFFSET]  = drive->sect;
1157                         args.tfRegister[IDE_LCYL_OFFSET]    = drive->cyl;
1158                         args.tfRegister[IDE_HCYL_OFFSET]    = drive->cyl>>8;
1159                         args.tfRegister[IDE_SELECT_OFFSET]  = ((drive->head-1)|drive->select.all)&0xBF;
1160                         args.tfRegister[IDE_COMMAND_OFFSET] = WIN_SPECIFY;
1161                         args.command_type = ide_cmd_type_parser(&args);
1162                         do_rw_taskfile(drive, &args);
1163                 }
1164         } else if (s->b.recalibrate) {
1165                 s->b.recalibrate = 0;
1166                 if (!IS_PDC4030_DRIVE) {
1167                         ide_task_t args;
1168                         memset(&args, 0, sizeof(ide_task_t));
1169                         args.tfRegister[IDE_NSECTOR_OFFSET] = drive->sect;
1170                         args.tfRegister[IDE_COMMAND_OFFSET] = WIN_RESTORE;
1171                         args.command_type = ide_cmd_type_parser(&args);
1172                         do_rw_taskfile(drive, &args);
1173                 }
1174         } else if (s->b.set_multmode) {
1175                 s->b.set_multmode = 0;
1176                 if (drive->mult_req > drive->id->max_multsect)
1177                         drive->mult_req = drive->id->max_multsect;
1178                 if (!IS_PDC4030_DRIVE) {
1179                         ide_task_t args;
1180                         memset(&args, 0, sizeof(ide_task_t));
1181                         args.tfRegister[IDE_NSECTOR_OFFSET] = drive->mult_req;
1182                         args.tfRegister[IDE_COMMAND_OFFSET] = WIN_SETMULT;
1183                         args.command_type = ide_cmd_type_parser(&args);
1184                         do_rw_taskfile(drive, &args);
1185                 }
1186         } else if (s->all) {
1187                 int special = s->all;
1188                 s->all = 0;
1189                 printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special);
1190                 return ide_stopped;
1191         }
1192         return IS_PDC4030_DRIVE ? ide_stopped : ide_started;
1193 }
1194
1195 static void idedisk_pre_reset (ide_drive_t *drive)
1196 {
1197         int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;
1198
1199         drive->special.all = 0;
1200         drive->special.b.set_geometry = legacy;
1201         drive->special.b.recalibrate  = legacy;
1202         if (OK_TO_RESET_CONTROLLER)
1203                 drive->mult_count = 0;
1204         if (!drive->keep_settings && !drive->using_dma)
1205                 drive->mult_req = 0;
1206         if (drive->mult_req != drive->mult_count)
1207                 drive->special.b.set_multmode = 1;
1208 }
1209
1210 #ifdef CONFIG_PROC_FS
1211
1212 static int smart_enable(ide_drive_t *drive)
1213 {
1214         ide_task_t args;
1215
1216         memset(&args, 0, sizeof(ide_task_t));
1217         args.tfRegister[IDE_FEATURE_OFFSET]     = SMART_ENABLE;
1218         args.tfRegister[IDE_LCYL_OFFSET]        = SMART_LCYL_PASS;
1219         args.tfRegister[IDE_HCYL_OFFSET]        = SMART_HCYL_PASS;
1220         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SMART;
1221         args.command_type                       = ide_cmd_type_parser(&args);
1222         return ide_raw_taskfile(drive, &args, NULL);
1223 }
1224
1225 static int get_smart_values(ide_drive_t *drive, u8 *buf)
1226 {
1227         ide_task_t args;
1228
1229         memset(&args, 0, sizeof(ide_task_t));
1230         args.tfRegister[IDE_FEATURE_OFFSET]     = SMART_READ_VALUES;
1231         args.tfRegister[IDE_NSECTOR_OFFSET]     = 0x01;
1232         args.tfRegister[IDE_LCYL_OFFSET]        = SMART_LCYL_PASS;
1233         args.tfRegister[IDE_HCYL_OFFSET]        = SMART_HCYL_PASS;
1234         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SMART;
1235         args.command_type                       = ide_cmd_type_parser(&args);
1236         (void) smart_enable(drive);
1237         return ide_raw_taskfile(drive, &args, buf);
1238 }
1239
1240 static int get_smart_thresholds(ide_drive_t *drive, u8 *buf)
1241 {
1242         ide_task_t args;
1243         memset(&args, 0, sizeof(ide_task_t));
1244         args.tfRegister[IDE_FEATURE_OFFSET]     = SMART_READ_THRESHOLDS;
1245         args.tfRegister[IDE_NSECTOR_OFFSET]     = 0x01;
1246         args.tfRegister[IDE_LCYL_OFFSET]        = SMART_LCYL_PASS;
1247         args.tfRegister[IDE_HCYL_OFFSET]        = SMART_HCYL_PASS;
1248         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SMART;
1249         args.command_type                       = ide_cmd_type_parser(&args);
1250         (void) smart_enable(drive);
1251         return ide_raw_taskfile(drive, &args, buf);
1252 }
1253
1254 static int proc_idedisk_read_cache
1255         (char *page, char **start, off_t off, int count, int *eof, void *data)
1256 {
1257         ide_drive_t     *drive = (ide_drive_t *) data;
1258         char            *out = page;
1259         int             len;
1260
1261         if (drive->id_read)
1262                 len = sprintf(out,"%i\n", drive->id->buf_size / 2);
1263         else
1264                 len = sprintf(out,"(none)\n");
1265         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
1266 }
1267
1268 static int proc_idedisk_read_smart_thresholds
1269         (char *page, char **start, off_t off, int count, int *eof, void *data)
1270 {
1271         ide_drive_t     *drive = (ide_drive_t *)data;
1272         int             len = 0, i = 0;
1273
1274         if (!get_smart_thresholds(drive, page)) {
1275                 unsigned short *val = (unsigned short *) page;
1276                 char *out = ((char *)val) + (SECTOR_WORDS * 4);
1277                 page = out;
1278                 do {
1279                         out += sprintf(out, "%04x%c", le16_to_cpu(*val), (++i & 7) ? ' ' : '\n');
1280                         val += 1;
1281                 } while (i < (SECTOR_WORDS * 2));
1282                 len = out - page;
1283         }
1284         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
1285 }
1286
1287 static int proc_idedisk_read_smart_values
1288         (char *page, char **start, off_t off, int count, int *eof, void *data)
1289 {
1290         ide_drive_t     *drive = (ide_drive_t *)data;
1291         int             len = 0, i = 0;
1292
1293         if (!get_smart_values(drive, page)) {
1294                 unsigned short *val = (unsigned short *) page;
1295                 char *out = ((char *)val) + (SECTOR_WORDS * 4);
1296                 page = out;
1297                 do {
1298                         out += sprintf(out, "%04x%c", le16_to_cpu(*val), (++i & 7) ? ' ' : '\n');
1299                         val += 1;
1300                 } while (i < (SECTOR_WORDS * 2));
1301                 len = out - page;
1302         }
1303         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
1304 }
1305
1306 static ide_proc_entry_t idedisk_proc[] = {
1307         { "cache",              S_IFREG|S_IRUGO,        proc_idedisk_read_cache,                NULL },
1308         { "geometry",           S_IFREG|S_IRUGO,        proc_ide_read_geometry,                 NULL },
1309         { "smart_values",       S_IFREG|S_IRUSR,        proc_idedisk_read_smart_values,         NULL },
1310         { "smart_thresholds",   S_IFREG|S_IRUSR,        proc_idedisk_read_smart_thresholds,     NULL },
1311         { NULL, 0, NULL, NULL }
1312 };
1313
1314 #else
1315
1316 #define idedisk_proc    NULL
1317
1318 #endif  /* CONFIG_PROC_FS */
1319
1320 /*
1321  * This is tightly woven into the driver->do_special can not touch.
1322  * DON'T do it again until a total personality rewrite is committed.
1323  */
1324 static int set_multcount(ide_drive_t *drive, int arg)
1325 {
1326         struct request rq;
1327
1328         if (drive->special.b.set_multmode)
1329                 return -EBUSY;
1330         ide_init_drive_cmd (&rq);
1331         rq.flags = REQ_DRIVE_CMD;
1332         drive->mult_req = arg;
1333         drive->special.b.set_multmode = 1;
1334         (void) ide_do_drive_cmd (drive, &rq, ide_wait);
1335         return (drive->mult_count == arg) ? 0 : -EIO;
1336 }
1337
1338 static int set_nowerr(ide_drive_t *drive, int arg)
1339 {
1340         if (ide_spin_wait_hwgroup(drive))
1341                 return -EBUSY;
1342         drive->nowerr = arg;
1343         drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
1344         spin_unlock_irq(&ide_lock);
1345         return 0;
1346 }
1347
1348 static int write_cache (ide_drive_t *drive, int arg)
1349 {
1350         ide_task_t args;
1351
1352         if (!(drive->id->cfs_enable_2 & 0x3000))
1353                 return 1;
1354
1355         memset(&args, 0, sizeof(ide_task_t));
1356         args.tfRegister[IDE_FEATURE_OFFSET]     = (arg) ?
1357                         SETFEATURES_EN_WCACHE : SETFEATURES_DIS_WCACHE;
1358         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SETFEATURES;
1359         args.command_type                       = ide_cmd_type_parser(&args);
1360         (void) ide_raw_taskfile(drive, &args, NULL);
1361
1362         drive->wcache = arg;
1363         return 0;
1364 }
1365
1366 static int do_idedisk_flushcache (ide_drive_t *drive)
1367 {
1368         ide_task_t args;
1369
1370         memset(&args, 0, sizeof(ide_task_t));
1371         if (drive->id->cfs_enable_2 & 0x2400)
1372                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_FLUSH_CACHE_EXT;
1373         else
1374                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_FLUSH_CACHE;
1375         args.command_type                       = ide_cmd_type_parser(&args);
1376         return ide_raw_taskfile(drive, &args, NULL);
1377 }
1378
1379 static int set_acoustic (ide_drive_t *drive, int arg)
1380 {
1381         ide_task_t args;
1382
1383         memset(&args, 0, sizeof(ide_task_t));
1384         args.tfRegister[IDE_FEATURE_OFFSET]     = (arg) ? SETFEATURES_EN_AAM :
1385                                                           SETFEATURES_DIS_AAM;
1386         args.tfRegister[IDE_NSECTOR_OFFSET]     = arg;
1387         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SETFEATURES;
1388         args.command_type = ide_cmd_type_parser(&args);
1389         ide_raw_taskfile(drive, &args, NULL);
1390         drive->acoustic = arg;
1391         return 0;
1392 }
1393
1394 #ifdef CONFIG_BLK_DEV_IDE_TCQ
1395 static int set_using_tcq(ide_drive_t *drive, int arg)
1396 {
1397         int ret;
1398
1399         if (!drive->driver)
1400                 return -EPERM;
1401         if (arg == drive->queue_depth && drive->using_tcq)
1402                 return 0;
1403
1404         /*
1405          * set depth, but check also id for max supported depth
1406          */
1407         drive->queue_depth = arg ? arg : 1;
1408         if (drive->id) {
1409                 if (drive->queue_depth > drive->id->queue_depth + 1)
1410                         drive->queue_depth = drive->id->queue_depth + 1;
1411         }
1412
1413         if (arg)
1414                 ret = __ide_dma_queued_on(drive);
1415         else
1416                 ret = __ide_dma_queued_off(drive);
1417
1418         return ret ? -EIO : 0;
1419 }
1420 #endif
1421
1422 /*
1423  * drive->addressing:
1424  *      0: 28-bit
1425  *      1: 48-bit
1426  *      2: 48-bit capable doing 28-bit
1427  */
1428 static int set_lba_addressing(ide_drive_t *drive, int arg)
1429 {
1430         drive->addressing =  0;
1431
1432         if (HWIF(drive)->no_lba48)
1433                 return 0;
1434
1435         if (!idedisk_supports_lba48(drive->id))
1436                 return -EIO;
1437         drive->addressing = arg;
1438         return 0;
1439 }
1440
1441 static void idedisk_add_settings(ide_drive_t *drive)
1442 {
1443         struct hd_driveid *id = drive->id;
1444
1445         ide_add_setting(drive,  "bios_cyl",             SETTING_RW,                                     -1,                     -1,                     TYPE_INT,       0,      65535,                          1,      1,      &drive->bios_cyl,               NULL);
1446         ide_add_setting(drive,  "bios_head",            SETTING_RW,                                     -1,                     -1,                     TYPE_BYTE,      0,      255,                            1,      1,      &drive->bios_head,              NULL);
1447         ide_add_setting(drive,  "bios_sect",            SETTING_RW,                                     -1,                     -1,                     TYPE_BYTE,      0,      63,                             1,      1,      &drive->bios_sect,              NULL);
1448         ide_add_setting(drive,  "address",              SETTING_RW,                                     HDIO_GET_ADDRESS,       HDIO_SET_ADDRESS,       TYPE_INTA,      0,      2,                              1,      1,      &drive->addressing,     set_lba_addressing);
1449         ide_add_setting(drive,  "bswap",                SETTING_READ,                                   -1,                     -1,                     TYPE_BYTE,      0,      1,                              1,      1,      &drive->bswap,                  NULL);
1450         ide_add_setting(drive,  "multcount",            id ? SETTING_RW : SETTING_READ,                 HDIO_GET_MULTCOUNT,     HDIO_SET_MULTCOUNT,     TYPE_BYTE,      0,      id ? id->max_multsect : 0,      1,      1,      &drive->mult_count,             set_multcount);
1451         ide_add_setting(drive,  "nowerr",               SETTING_RW,                                     HDIO_GET_NOWERR,        HDIO_SET_NOWERR,        TYPE_BYTE,      0,      1,                              1,      1,      &drive->nowerr,                 set_nowerr);
1452         ide_add_setting(drive,  "lun",                  SETTING_RW,                                     -1,                     -1,                     TYPE_INT,       0,      7,                              1,      1,      &drive->lun,                    NULL);
1453         ide_add_setting(drive,  "wcache",               SETTING_RW,                                     HDIO_GET_WCACHE,        HDIO_SET_WCACHE,        TYPE_BYTE,      0,      1,                              1,      1,      &drive->wcache,                 write_cache);
1454         ide_add_setting(drive,  "acoustic",             SETTING_RW,                                     HDIO_GET_ACOUSTIC,      HDIO_SET_ACOUSTIC,      TYPE_BYTE,      0,      254,                            1,      1,      &drive->acoustic,               set_acoustic);
1455         ide_add_setting(drive,  "failures",             SETTING_RW,                                     -1,                     -1,                     TYPE_INT,       0,      65535,                          1,      1,      &drive->failures,               NULL);
1456         ide_add_setting(drive,  "max_failures",         SETTING_RW,                                     -1,                     -1,                     TYPE_INT,       0,      65535,                          1,      1,      &drive->max_failures,           NULL);
1457 #ifdef CONFIG_BLK_DEV_IDE_TCQ
1458         ide_add_setting(drive,  "using_tcq",            SETTING_RW,                                     HDIO_GET_QDMA,          HDIO_SET_QDMA,          TYPE_BYTE,      0,      IDE_MAX_TAG,                    1,              1,              &drive->using_tcq,              set_using_tcq);
1459 #endif
1460 }
1461
1462 /*
1463  * Power Management state machine. This one is rather trivial for now,
1464  * we should probably add more, like switching back to PIO on suspend
1465  * to help some BIOSes, re-do the door locking on resume, etc...
1466  */
1467
1468 enum {
1469         idedisk_pm_flush_cache  = ide_pm_state_start_suspend,
1470         idedisk_pm_standby,
1471
1472         idedisk_pm_restore_dma  = ide_pm_state_start_resume,
1473 };
1474
1475 static void idedisk_complete_power_step (ide_drive_t *drive, struct request *rq, u8 stat, u8 error)
1476 {
1477         switch (rq->pm->pm_step) {
1478         case idedisk_pm_flush_cache:    /* Suspend step 1 (flush cache) complete */
1479                 if (rq->pm->pm_state == 4)
1480                         rq->pm->pm_step = ide_pm_state_completed;
1481                 else
1482                         rq->pm->pm_step = idedisk_pm_standby;
1483                 break;
1484         case idedisk_pm_standby:        /* Suspend step 2 (standby) complete */
1485                 rq->pm->pm_step = ide_pm_state_completed;
1486                 break;
1487         }
1488 }
1489
1490 static ide_startstop_t idedisk_start_power_step (ide_drive_t *drive, struct request *rq)
1491 {
1492         ide_task_t *args = rq->special;
1493
1494         memset(args, 0, sizeof(*args));
1495
1496         switch (rq->pm->pm_step) {
1497         case idedisk_pm_flush_cache:    /* Suspend step 1 (flush cache) */
1498                 /* Not supported? Switch to next step now. */
1499                 if (!drive->wcache) {
1500                         idedisk_complete_power_step(drive, rq, 0, 0);
1501                         return ide_stopped;
1502                 }
1503                 if (drive->id->cfs_enable_2 & 0x2400)
1504                         args->tfRegister[IDE_COMMAND_OFFSET] = WIN_FLUSH_CACHE_EXT;
1505                 else
1506                         args->tfRegister[IDE_COMMAND_OFFSET] = WIN_FLUSH_CACHE;
1507                 args->command_type = ide_cmd_type_parser(args);
1508                 return do_rw_taskfile(drive, args);
1509         case idedisk_pm_standby:        /* Suspend step 2 (standby) */
1510                 args->tfRegister[IDE_COMMAND_OFFSET] = WIN_STANDBYNOW1;
1511                 args->command_type = ide_cmd_type_parser(args);
1512                 return do_rw_taskfile(drive, args);
1513
1514         case idedisk_pm_restore_dma:    /* Resume step 1 (restore DMA) */
1515                 /*
1516                  * Right now, all we do is call hwif->ide_dma_check(drive),
1517                  * we could be smarter and check for current xfer_speed
1518                  * in struct drive etc...
1519                  * Also, this step could be implemented as a generic helper
1520                  * as most subdrivers will use it
1521                  */
1522                 if ((drive->id->capability & 1) == 0)
1523                         break;
1524                 if (HWIF(drive)->ide_dma_check == NULL)
1525                         break;
1526                 HWIF(drive)->ide_dma_check(drive);
1527                 break;
1528         }
1529         rq->pm->pm_step = ide_pm_state_completed;
1530         return ide_stopped;
1531 }
1532
1533 static void idedisk_setup (ide_drive_t *drive)
1534 {
1535         struct hd_driveid *id = drive->id;
1536         unsigned long long capacity;
1537
1538         idedisk_add_settings(drive);
1539
1540         if (drive->id_read == 0)
1541                 return;
1542
1543         /*
1544          * CompactFlash cards and their brethern look just like hard drives
1545          * to us, but they are removable and don't have a doorlock mechanism.
1546          */
1547         if (drive->removable && !(drive->is_flash)) {
1548                 /*
1549                  * Removable disks (eg. SYQUEST); ignore 'WD' drives
1550                  */
1551                 if (id->model[0] != 'W' || id->model[1] != 'D') {
1552                         drive->doorlocking = 1;
1553                 }
1554         }
1555
1556         (void)set_lba_addressing(drive, 1);
1557
1558         if (drive->addressing == 1) {
1559                 ide_hwif_t *hwif = HWIF(drive);
1560                 int max_s = 2048;
1561
1562                 if (max_s > hwif->rqsize)
1563                         max_s = hwif->rqsize;
1564
1565                 blk_queue_max_sectors(drive->queue, max_s);
1566         }
1567
1568         printk("%s: max request size: %dKiB\n", drive->name, drive->queue->max_sectors / 2);
1569
1570         /* Extract geometry if we did not already have one for the drive */
1571         if (!drive->cyl || !drive->head || !drive->sect) {
1572                 drive->cyl     = drive->bios_cyl  = id->cyls;
1573                 drive->head    = drive->bios_head = id->heads;
1574                 drive->sect    = drive->bios_sect = id->sectors;
1575         }
1576
1577         /* Handle logical geometry translation by the drive */
1578         if ((id->field_valid & 1) && id->cur_cyls &&
1579             id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
1580                 drive->cyl  = id->cur_cyls;
1581                 drive->head = id->cur_heads;
1582                 drive->sect = id->cur_sectors;
1583         }
1584
1585         /* Use physical geometry if what we have still makes no sense */
1586         if (drive->head > 16 && id->heads && id->heads <= 16) {
1587                 drive->cyl  = id->cyls;
1588                 drive->head = id->heads;
1589                 drive->sect = id->sectors;
1590         }
1591
1592         /* calculate drive capacity, and select LBA if possible */
1593         init_idedisk_capacity (drive);
1594
1595         /* limit drive capacity to 137GB if LBA48 cannot be used */
1596         if (drive->addressing == 0 && drive->capacity64 > 1ULL << 28) {
1597                 printk("%s: cannot use LBA48 - full capacity "
1598                        "%llu sectors (%llu MB)\n",
1599                        drive->name, (unsigned long long)drive->capacity64,
1600                        sectors_to_MB(drive->capacity64));
1601                 drive->capacity64 = 1ULL << 28;
1602         }
1603
1604         /*
1605          * if possible, give fdisk access to more of the drive,
1606          * by correcting bios_cyls:
1607          */
1608         capacity = idedisk_capacity (drive);
1609         if (!drive->forced_geom) {
1610
1611                 if (idedisk_supports_lba48(drive->id)) {
1612                         /* compatibility */
1613                         drive->bios_sect = 63;
1614                         drive->bios_head = 255;
1615                 }
1616
1617                 if (drive->bios_sect && drive->bios_head) {
1618                         unsigned int cap0 = capacity; /* truncate to 32 bits */
1619                         unsigned int cylsz, cyl;
1620
1621                         if (cap0 != capacity)
1622                                 drive->bios_cyl = 65535;
1623                         else {
1624                                 cylsz = drive->bios_sect * drive->bios_head;
1625                                 cyl = cap0 / cylsz;
1626                                 if (cyl > 65535)
1627                                         cyl = 65535;
1628                                 if (cyl > drive->bios_cyl)
1629                                         drive->bios_cyl = cyl;
1630                         }
1631                 }
1632         }
1633         printk(KERN_INFO "%s: %llu sectors (%llu MB)",
1634                          drive->name, capacity, sectors_to_MB(capacity));
1635
1636         /* Only print cache size when it was specified */
1637         if (id->buf_size)
1638                 printk (" w/%dKiB Cache", id->buf_size/2);
1639
1640         printk(", CHS=%d/%d/%d",
1641                drive->bios_cyl, drive->bios_head, drive->bios_sect);
1642         if (drive->using_dma)
1643                 (void) HWIF(drive)->ide_dma_verbose(drive);
1644         printk("\n");
1645
1646         drive->mult_count = 0;
1647         if (id->max_multsect) {
1648 #ifdef CONFIG_IDEDISK_MULTI_MODE
1649                 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
1650                 id->multsect_valid = id->multsect ? 1 : 0;
1651                 drive->mult_req = id->multsect_valid ? id->max_multsect : INITIAL_MULT_COUNT;
1652                 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
1653 #else   /* original, pre IDE-NFG, per request of AC */
1654                 drive->mult_req = INITIAL_MULT_COUNT;
1655                 if (drive->mult_req > id->max_multsect)
1656                         drive->mult_req = id->max_multsect;
1657                 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
1658                         drive->special.b.set_multmode = 1;
1659 #endif  /* CONFIG_IDEDISK_MULTI_MODE */
1660         }
1661         drive->no_io_32bit = id->dword_io ? 1 : 0;
1662         if (drive->id->cfs_enable_2 & 0x3000)
1663                 write_cache(drive, (id->cfs_enable_2 & 0x3000));
1664
1665 #ifdef CONFIG_BLK_DEV_IDE_TCQ_DEFAULT
1666         if (drive->using_dma)
1667                 __ide_dma_queued_on(drive);
1668 #endif
1669 }
1670
1671 static int idedisk_cleanup (ide_drive_t *drive)
1672 {
1673         static int ide_cacheflush_p(ide_drive_t *drive);
1674         struct gendisk *g = drive->disk;
1675         ide_cacheflush_p(drive);
1676         if (ide_unregister_subdriver(drive))
1677                 return 1;
1678         del_gendisk(g);
1679         g->fops = ide_fops;
1680         return 0;
1681 }
1682
1683 static int idedisk_attach(ide_drive_t *drive);
1684
1685 /*
1686  *      IDE subdriver functions, registered with ide.c
1687  */
1688 static ide_driver_t idedisk_driver = {
1689         .owner                  = THIS_MODULE,
1690         .name                   = "ide-disk",
1691         .version                = IDEDISK_VERSION,
1692         .media                  = ide_disk,
1693         .busy                   = 0,
1694         .supports_dsc_overlap   = 0,
1695         .cleanup                = idedisk_cleanup,
1696         .do_request             = ide_do_rw_disk,
1697         .sense                  = idedisk_dump_status,
1698         .error                  = idedisk_error,
1699         .abort                  = idedisk_abort,
1700         .pre_reset              = idedisk_pre_reset,
1701         .capacity               = idedisk_capacity,
1702         .special                = idedisk_special,
1703         .proc                   = idedisk_proc,
1704         .attach                 = idedisk_attach,
1705         .drives                 = LIST_HEAD_INIT(idedisk_driver.drives),
1706         .start_power_step       = idedisk_start_power_step,
1707         .complete_power_step    = idedisk_complete_power_step,
1708 };
1709
1710 static int idedisk_open(struct inode *inode, struct file *filp)
1711 {
1712         ide_drive_t *drive = inode->i_bdev->bd_disk->private_data;
1713         drive->usage++;
1714         if (drive->removable && drive->usage == 1) {
1715                 ide_task_t args;
1716                 u8 cf;
1717                 memset(&args, 0, sizeof(ide_task_t));
1718                 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_DOORLOCK;
1719                 args.command_type = ide_cmd_type_parser(&args);
1720                 check_disk_change(inode->i_bdev);
1721                 /*
1722                  * Ignore the return code from door_lock,
1723                  * since the open() has already succeeded,
1724                  * and the door_lock is irrelevant at this point.
1725                  */
1726                 if (drive->doorlocking && ide_raw_taskfile(drive, &args, NULL))
1727                         drive->doorlocking = 0;
1728                 drive->wcache = 0;
1729                 /* Cache enabled ? */
1730                 if (drive->id->csfo & 1)
1731                 drive->wcache = 1;
1732                 /* Cache command set available ? */
1733                 if (drive->id->cfs_enable_1 & (1<<5))
1734                         drive->wcache = 1;
1735                 /* ATA6 cache extended commands */
1736                 cf = drive->id->command_set_2 >> 24;
1737                 if((cf & 0xC0) == 0x40 && (cf & 0x30) != 0)
1738                         drive->wcache = 1;
1739         }
1740         return 0;
1741 }
1742
1743 static int ide_cacheflush_p(ide_drive_t *drive)
1744 {
1745         if(drive->wcache)
1746         {
1747                 if (do_idedisk_flushcache(drive))
1748                 {
1749                         printk (KERN_INFO "%s: Write Cache FAILED Flushing!\n",
1750                                 drive->name);
1751                         return -EIO;
1752                 }
1753                 return 1;
1754         }
1755         return 0;
1756 }
1757
1758 static int idedisk_release(struct inode *inode, struct file *filp)
1759 {
1760         ide_drive_t *drive = inode->i_bdev->bd_disk->private_data;
1761         if (drive->removable && drive->usage == 1) {
1762                 ide_task_t args;
1763                 memset(&args, 0, sizeof(ide_task_t));
1764                 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_DOORUNLOCK;
1765                 args.command_type = ide_cmd_type_parser(&args);
1766                 if (drive->doorlocking && ide_raw_taskfile(drive, &args, NULL))
1767                         drive->doorlocking = 0;
1768         }
1769         ide_cacheflush_p(drive);
1770         drive->usage--;
1771         return 0;
1772 }
1773
1774 static int idedisk_ioctl(struct inode *inode, struct file *file,
1775                         unsigned int cmd, unsigned long arg)
1776 {
1777         struct block_device *bdev = inode->i_bdev;
1778         return generic_ide_ioctl(bdev, cmd, arg);
1779 }
1780
1781 static int idedisk_media_changed(struct gendisk *disk)
1782 {
1783         ide_drive_t *drive = disk->private_data;
1784
1785         /* do not scan partitions twice if this is a removable device */
1786         if (drive->attach) {
1787                 drive->attach = 0;
1788                 return 0;
1789         }
1790         /* if removable, always assume it was changed */
1791         return drive->removable;
1792 }
1793
1794 static int idedisk_revalidate_disk(struct gendisk *disk)
1795 {
1796         ide_drive_t *drive = disk->private_data;
1797         set_capacity(disk, current_capacity(drive));
1798         return 0;
1799 }
1800
1801 static struct block_device_operations idedisk_ops = {
1802         .owner          = THIS_MODULE,
1803         .open           = idedisk_open,
1804         .release        = idedisk_release,
1805         .ioctl          = idedisk_ioctl,
1806         .media_changed  = idedisk_media_changed,
1807         .revalidate_disk= idedisk_revalidate_disk
1808 };
1809
1810 MODULE_DESCRIPTION("ATA DISK Driver");
1811
1812 static int idedisk_attach(ide_drive_t *drive)
1813 {
1814         struct gendisk *g = drive->disk;
1815
1816         /* strstr("foo", "") is non-NULL */
1817         if (!strstr("ide-disk", drive->driver_req))
1818                 goto failed;
1819         if (!drive->present)
1820                 goto failed;
1821         if (drive->media != ide_disk)
1822                 goto failed;
1823
1824         if (ide_register_subdriver(drive, &idedisk_driver)) {
1825                 printk (KERN_ERR "ide-disk: %s: Failed to register the driver with ide.c\n", drive->name);
1826                 goto failed;
1827         }
1828         DRIVER(drive)->busy++;
1829         idedisk_setup(drive);
1830         if ((!drive->head || drive->head > 16) && !drive->select.b.lba) {
1831                 printk(KERN_ERR "%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
1832                         drive->name, drive->head);
1833                 if ((drive->id->cfs_enable_2 & 0x3000) && drive->wcache)
1834                         if (do_idedisk_flushcache(drive))
1835                                 printk (KERN_INFO "%s: Write Cache FAILED Flushing!\n",
1836                                         drive->name);
1837                 ide_unregister_subdriver(drive);
1838                 DRIVER(drive)->busy--;
1839                 goto failed;
1840         }
1841         DRIVER(drive)->busy--;
1842         g->minors = 1 << PARTN_BITS;
1843         strcpy(g->devfs_name, drive->devfs_name);
1844         g->driverfs_dev = &drive->gendev;
1845         g->flags = drive->removable ? GENHD_FL_REMOVABLE : 0;
1846         set_capacity(g, current_capacity(drive));
1847         g->fops = &idedisk_ops;
1848         drive->attach = 1;
1849         add_disk(g);
1850         return 0;
1851 failed:
1852         return 1;
1853 }
1854
1855 static void __exit idedisk_exit (void)
1856 {
1857         ide_unregister_driver(&idedisk_driver);
1858 }
1859
1860 static int idedisk_init (void)
1861 {
1862         return ide_register_driver(&idedisk_driver);
1863 }
1864
1865 module_init(idedisk_init);
1866 module_exit(idedisk_exit);
1867 MODULE_LICENSE("GPL");