SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/ide/ide-iops.c

   1 /*
   2  *  Copyright (C) 2000-2002     Andre Hedrick <andre@linux-ide.org>
   3  *  Copyright (C) 2003          Red Hat <alan@redhat.com>
   4  *
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/types.h>
   9 #include <linux/string.h>
  10 #include <linux/kernel.h>
  11 #include <linux/timer.h>
  12 #include <linux/mm.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/major.h>
  15 #include <linux/errno.h>
  16 #include <linux/genhd.h>
  17 #include <linux/blkpg.h>
  18 #include <linux/slab.h>
  19 #include <linux/pci.h>
  20 #include <linux/delay.h>
  21 #include <linux/hdreg.h>
  22 #include <linux/ide.h>
  23 #include <linux/bitops.h>
  24 #include <linux/nmi.h>
  25
  26 #include <asm/byteorder.h>
  27 #include <asm/irq.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/io.h>
  30
  31 /*
  32  *      Conventional PIO operations for ATA devices
  33  */
  34
  35 static u8 ide_inb (unsigned long port)
  36 {
  37         return (u8) inb(port);
  38 }
  39
  40 static void ide_outb (u8 val, unsigned long port)
  41 {
  42         outb(val, port);
  43 }
  44
  45 static void ide_outbsync(ide_hwif_t *hwif, u8 addr, unsigned long port)
  46 {
  47         outb(addr, port);
  48 }
  49
  50 void default_hwif_iops (ide_hwif_t *hwif)
  51 {
  52         hwif->OUTB      = ide_outb;
  53         hwif->OUTBSYNC  = ide_outbsync;
  54         hwif->INB       = ide_inb;
  55 }
  56
  57 /*
  58  *      MMIO operations, typically used for SATA controllers
  59  */
  60
  61 static u8 ide_mm_inb (unsigned long port)
  62 {
  63         return (u8) readb((void __iomem *) port);
  64 }
  65
  66 static void ide_mm_outb (u8 value, unsigned long port)
  67 {
  68         writeb(value, (void __iomem *) port);
  69 }
  70
  71 static void ide_mm_outbsync(ide_hwif_t *hwif, u8 value, unsigned long port)
  72 {
  73         writeb(value, (void __iomem *) port);
  74 }
  75
  76 void default_hwif_mmiops (ide_hwif_t *hwif)
  77 {
  78         hwif->OUTB      = ide_mm_outb;
  79         /* Most systems will need to override OUTBSYNC, alas however
  80            this one is controller specific! */
  81         hwif->OUTBSYNC  = ide_mm_outbsync;
  82         hwif->INB       = ide_mm_inb;
  83 }
  84
  85 EXPORT_SYMBOL(default_hwif_mmiops);
  86
  87 void SELECT_DRIVE (ide_drive_t *drive)
  88 {
  89         ide_hwif_t *hwif = drive->hwif;
  90         const struct ide_port_ops *port_ops = hwif->port_ops;
  91
  92         if (port_ops && port_ops->selectproc)
  93                 port_ops->selectproc(drive);
  94
  95         hwif->OUTB(drive->select.all, hwif->io_ports.device_addr);
  96 }
  97
  98 void SELECT_MASK(ide_drive_t *drive, int mask)
  99 {
 100         const struct ide_port_ops *port_ops = drive->hwif->port_ops;
 101
 102         if (port_ops && port_ops->maskproc)
 103                 port_ops->maskproc(drive, mask);
 104 }
 105
 106 static void ide_exec_command(ide_hwif_t *hwif, u8 cmd)
 107 {
 108         if (hwif->host_flags & IDE_HFLAG_MMIO)
 109                 writeb(cmd, (void __iomem *)hwif->io_ports.command_addr);
 110         else
 111                 outb(cmd, hwif->io_ports.command_addr);
 112 }
 113
 114 static u8 ide_read_sff_dma_status(ide_hwif_t *hwif)
 115 {
 116         if (hwif->host_flags & IDE_HFLAG_MMIO)
 117                 return readb((void __iomem *)(hwif->dma_base + ATA_DMA_STATUS));
 118         else
 119                 return inb(hwif->dma_base + ATA_DMA_STATUS);
 120 }
 121
 122 static void ide_tf_load(ide_drive_t *drive, ide_task_t *task)
 123 {
 124         ide_hwif_t *hwif = drive->hwif;
 125         struct ide_io_ports *io_ports = &hwif->io_ports;
 126         struct ide_taskfile *tf = &task->tf;
 127         void (*tf_outb)(u8 addr, unsigned long port);
 128         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 129         u8 HIHI = (task->tf_flags & IDE_TFLAG_LBA48) ? 0xE0 : 0xEF;
 130
 131         if (mmio)
 132                 tf_outb = ide_mm_outb;
 133         else
 134                 tf_outb = ide_outb;
 135
 136         if (task->tf_flags & IDE_TFLAG_FLAGGED)
 137                 HIHI = 0xFF;
 138
 139         if (task->tf_flags & IDE_TFLAG_OUT_DATA) {
 140                 u16 data = (tf->hob_data << 8) | tf->data;
 141
 142                 if (mmio)
 143                         writew(data, (void __iomem *)io_ports->data_addr);
 144                 else
 145                         outw(data, io_ports->data_addr);
 146         }
 147
 148         if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
 149                 tf_outb(tf->hob_feature, io_ports->feature_addr);
 150         if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
 151                 tf_outb(tf->hob_nsect, io_ports->nsect_addr);
 152         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
 153                 tf_outb(tf->hob_lbal, io_ports->lbal_addr);
 154         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
 155                 tf_outb(tf->hob_lbam, io_ports->lbam_addr);
 156         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
 157                 tf_outb(tf->hob_lbah, io_ports->lbah_addr);
 158
 159         if (task->tf_flags & IDE_TFLAG_OUT_FEATURE)
 160                 tf_outb(tf->feature, io_ports->feature_addr);
 161         if (task->tf_flags & IDE_TFLAG_OUT_NSECT)
 162                 tf_outb(tf->nsect, io_ports->nsect_addr);
 163         if (task->tf_flags & IDE_TFLAG_OUT_LBAL)
 164                 tf_outb(tf->lbal, io_ports->lbal_addr);
 165         if (task->tf_flags & IDE_TFLAG_OUT_LBAM)
 166                 tf_outb(tf->lbam, io_ports->lbam_addr);
 167         if (task->tf_flags & IDE_TFLAG_OUT_LBAH)
 168                 tf_outb(tf->lbah, io_ports->lbah_addr);
 169
 170         if (task->tf_flags & IDE_TFLAG_OUT_DEVICE)
 171                 tf_outb((tf->device & HIHI) | drive->select.all,
 172                          io_ports->device_addr);
 173 }
 174
 175 static void ide_tf_read(ide_drive_t *drive, ide_task_t *task)
 176 {
 177         ide_hwif_t *hwif = drive->hwif;
 178         struct ide_io_ports *io_ports = &hwif->io_ports;
 179         struct ide_taskfile *tf = &task->tf;
 180         void (*tf_outb)(u8 addr, unsigned long port);
 181         u8 (*tf_inb)(unsigned long port);
 182         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 183
 184         if (mmio) {
 185                 tf_outb = ide_mm_outb;
 186                 tf_inb  = ide_mm_inb;
 187         } else {
 188                 tf_outb = ide_outb;
 189                 tf_inb  = ide_inb;
 190         }
 191
 192         if (task->tf_flags & IDE_TFLAG_IN_DATA) {
 193                 u16 data;
 194
 195                 if (mmio)
 196                         data = readw((void __iomem *)io_ports->data_addr);
 197                 else
 198                         data = inw(io_ports->data_addr);
 199
 200                 tf->data = data & 0xff;
 201                 tf->hob_data = (data >> 8) & 0xff;
 202         }
 203
 204         /* be sure we're looking at the low order bits */
 205         tf_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
 206
 207         if (task->tf_flags & IDE_TFLAG_IN_NSECT)
 208                 tf->nsect  = tf_inb(io_ports->nsect_addr);
 209         if (task->tf_flags & IDE_TFLAG_IN_LBAL)
 210                 tf->lbal   = tf_inb(io_ports->lbal_addr);
 211         if (task->tf_flags & IDE_TFLAG_IN_LBAM)
 212                 tf->lbam   = tf_inb(io_ports->lbam_addr);
 213         if (task->tf_flags & IDE_TFLAG_IN_LBAH)
 214                 tf->lbah   = tf_inb(io_ports->lbah_addr);
 215         if (task->tf_flags & IDE_TFLAG_IN_DEVICE)
 216                 tf->device = tf_inb(io_ports->device_addr);
 217
 218         if (task->tf_flags & IDE_TFLAG_LBA48) {
 219                 tf_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
 220
 221                 if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
 222                         tf->hob_feature = tf_inb(io_ports->feature_addr);
 223                 if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
 224                         tf->hob_nsect   = tf_inb(io_ports->nsect_addr);
 225                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
 226                         tf->hob_lbal    = tf_inb(io_ports->lbal_addr);
 227                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
 228                         tf->hob_lbam    = tf_inb(io_ports->lbam_addr);
 229                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
 230                         tf->hob_lbah    = tf_inb(io_ports->lbah_addr);
 231         }
 232 }
 233
 234 /*
 235  * Some localbus EIDE interfaces require a special access sequence
 236  * when using 32-bit I/O instructions to transfer data.  We call this
 237  * the "vlb_sync" sequence, which consists of three successive reads
 238  * of the sector count register location, with interrupts disabled
 239  * to ensure that the reads all happen together.
 240  */
 241 static void ata_vlb_sync(unsigned long port)
 242 {
 243         (void)inb(port);
 244         (void)inb(port);
 245         (void)inb(port);
 246 }
 247
 248 /*
 249  * This is used for most PIO data transfers *from* the IDE interface
 250  *
 251  * These routines will round up any request for an odd number of bytes,
 252  * so if an odd len is specified, be sure that there's at least one
 253  * extra byte allocated for the buffer.
 254  */
 255 static void ata_input_data(ide_drive_t *drive, struct request *rq,
 256                            void *buf, unsigned int len)
 257 {
 258         ide_hwif_t *hwif = drive->hwif;
 259         struct ide_io_ports *io_ports = &hwif->io_ports;
 260         unsigned long data_addr = io_ports->data_addr;
 261         u8 io_32bit = drive->io_32bit;
 262         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 263
 264         len++;
 265
 266         if (io_32bit) {
 267                 unsigned long uninitialized_var(flags);
 268
 269                 if ((io_32bit & 2) && !mmio) {
 270                         local_irq_save(flags);
 271                         ata_vlb_sync(io_ports->nsect_addr);
 272                 }
 273
 274                 if (mmio)
 275                         __ide_mm_insl((void __iomem *)data_addr, buf, len / 4);
 276                 else
 277                         insl(data_addr, buf, len / 4);
 278
 279                 if ((io_32bit & 2) && !mmio)
 280                         local_irq_restore(flags);
 281
 282                 if ((len & 3) >= 2) {
 283                         if (mmio)
 284                                 __ide_mm_insw((void __iomem *)data_addr,
 285                                                 (u8 *)buf + (len & ~3), 1);
 286                         else
 287                                 insw(data_addr, (u8 *)buf + (len & ~3), 1);
 288                 }
 289         } else {
 290                 if (mmio)
 291                         __ide_mm_insw((void __iomem *)data_addr, buf, len / 2);
 292                 else
 293                         insw(data_addr, buf, len / 2);
 294         }
 295 }
 296
 297 /*
 298  * This is used for most PIO data transfers *to* the IDE interface
 299  */
 300 static void ata_output_data(ide_drive_t *drive, struct request *rq,
 301                             void *buf, unsigned int len)
 302 {
 303         ide_hwif_t *hwif = drive->hwif;
 304         struct ide_io_ports *io_ports = &hwif->io_ports;
 305         unsigned long data_addr = io_ports->data_addr;
 306         u8 io_32bit = drive->io_32bit;
 307         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 308
 309         if (io_32bit) {
 310                 unsigned long uninitialized_var(flags);
 311
 312                 if ((io_32bit & 2) && !mmio) {
 313                         local_irq_save(flags);
 314                         ata_vlb_sync(io_ports->nsect_addr);
 315                 }
 316
 317                 if (mmio)
 318                         __ide_mm_outsl((void __iomem *)data_addr, buf, len / 4);
 319                 else
 320                         outsl(data_addr, buf, len / 4);
 321
 322                 if ((io_32bit & 2) && !mmio)
 323                         local_irq_restore(flags);
 324
 325                 if ((len & 3) >= 2) {
 326                         if (mmio)
 327                                 __ide_mm_outsw((void __iomem *)data_addr,
 328                                                  (u8 *)buf + (len & ~3), 1);
 329                         else
 330                                 outsw(data_addr, (u8 *)buf + (len & ~3), 1);
 331                 }
 332         } else {
 333                 if (mmio)
 334                         __ide_mm_outsw((void __iomem *)data_addr, buf, len / 2);
 335                 else
 336                         outsw(data_addr, buf, len / 2);
 337         }
 338 }
 339
 340 void default_hwif_transport(ide_hwif_t *hwif)
 341 {
 342         hwif->exec_command        = ide_exec_command;
 343         hwif->read_sff_dma_status = ide_read_sff_dma_status;
 344
 345         hwif->tf_load     = ide_tf_load;
 346         hwif->tf_read     = ide_tf_read;
 347
 348         hwif->input_data  = ata_input_data;
 349         hwif->output_data = ata_output_data;
 350 }
 351
 352 void ide_fix_driveid (struct hd_driveid *id)
 353 {
 354 #ifndef __LITTLE_ENDIAN
 355 # ifdef __BIG_ENDIAN
 356         int i;
 357         u16 *stringcast;
 358
 359         id->config         = __le16_to_cpu(id->config);
 360         id->cyls           = __le16_to_cpu(id->cyls);
 361         id->reserved2      = __le16_to_cpu(id->reserved2);
 362         id->heads          = __le16_to_cpu(id->heads);
 363         id->track_bytes    = __le16_to_cpu(id->track_bytes);
 364         id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
 365         id->sectors        = __le16_to_cpu(id->sectors);
 366         id->vendor0        = __le16_to_cpu(id->vendor0);
 367         id->vendor1        = __le16_to_cpu(id->vendor1);
 368         id->vendor2        = __le16_to_cpu(id->vendor2);
 369         stringcast = (u16 *)&id->serial_no[0];
 370         for (i = 0; i < (20/2); i++)
 371                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 372         id->buf_type       = __le16_to_cpu(id->buf_type);
 373         id->buf_size       = __le16_to_cpu(id->buf_size);
 374         id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
 375         stringcast = (u16 *)&id->fw_rev[0];
 376         for (i = 0; i < (8/2); i++)
 377                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 378         stringcast = (u16 *)&id->model[0];
 379         for (i = 0; i < (40/2); i++)
 380                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 381         id->dword_io       = __le16_to_cpu(id->dword_io);
 382         id->reserved50     = __le16_to_cpu(id->reserved50);
 383         id->field_valid    = __le16_to_cpu(id->field_valid);
 384         id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
 385         id->cur_heads      = __le16_to_cpu(id->cur_heads);
 386         id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
 387         id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
 388         id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
 389         id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
 390         id->dma_1word      = __le16_to_cpu(id->dma_1word);
 391         id->dma_mword      = __le16_to_cpu(id->dma_mword);
 392         id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
 393         id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
 394         id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
 395         id->eide_pio       = __le16_to_cpu(id->eide_pio);
 396         id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
 397         for (i = 0; i < 2; ++i)
 398                 id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
 399         for (i = 0; i < 4; ++i)
 400                 id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
 401         id->queue_depth    = __le16_to_cpu(id->queue_depth);
 402         for (i = 0; i < 4; ++i)
 403                 id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
 404         id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
 405         id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
 406         id->command_set_1  = __le16_to_cpu(id->command_set_1);
 407         id->command_set_2  = __le16_to_cpu(id->command_set_2);
 408         id->cfsse          = __le16_to_cpu(id->cfsse);
 409         id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
 410         id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
 411         id->csf_default    = __le16_to_cpu(id->csf_default);
 412         id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
 413         id->trseuc         = __le16_to_cpu(id->trseuc);
 414         id->trsEuc         = __le16_to_cpu(id->trsEuc);
 415         id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
 416         id->mprc           = __le16_to_cpu(id->mprc);
 417         id->hw_config      = __le16_to_cpu(id->hw_config);
 418         id->acoustic       = __le16_to_cpu(id->acoustic);
 419         id->msrqs          = __le16_to_cpu(id->msrqs);
 420         id->sxfert         = __le16_to_cpu(id->sxfert);
 421         id->sal            = __le16_to_cpu(id->sal);
 422         id->spg            = __le32_to_cpu(id->spg);
 423         id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
 424         for (i = 0; i < 22; i++)
 425                 id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
 426         id->last_lun       = __le16_to_cpu(id->last_lun);
 427         id->word127        = __le16_to_cpu(id->word127);
 428         id->dlf            = __le16_to_cpu(id->dlf);
 429         id->csfo           = __le16_to_cpu(id->csfo);
 430         for (i = 0; i < 26; i++)
 431                 id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
 432         id->word156        = __le16_to_cpu(id->word156);
 433         for (i = 0; i < 3; i++)
 434                 id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
 435         id->cfa_power      = __le16_to_cpu(id->cfa_power);
 436         for (i = 0; i < 14; i++)
 437                 id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
 438         for (i = 0; i < 31; i++)
 439                 id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
 440         for (i = 0; i < 48; i++)
 441                 id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
 442         id->integrity_word  = __le16_to_cpu(id->integrity_word);
 443 # else
 444 #  error "Please fix <asm/byteorder.h>"
 445 # endif
 446 #endif
 447 }
 448
 449 /*
 450  * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
 451  * removing leading/trailing blanks and compressing internal blanks.
 452  * It is primarily used to tidy up the model name/number fields as
 453  * returned by the WIN_[P]IDENTIFY commands.
 454  */
 455
 456 void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
 457 {
 458         u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
 459
 460         if (byteswap) {
 461                 /* convert from big-endian to host byte order */
 462                 for (p = end ; p != s;) {
 463                         unsigned short *pp = (unsigned short *) (p -= 2);
 464                         *pp = ntohs(*pp);
 465                 }
 466         }
 467         /* strip leading blanks */
 468         while (s != end && *s == ' ')
 469                 ++s;
 470         /* compress internal blanks and strip trailing blanks */
 471         while (s != end && *s) {
 472                 if (*s++ != ' ' || (s != end && *s && *s != ' '))
 473                         *p++ = *(s-1);
 474         }
 475         /* wipe out trailing garbage */
 476         while (p != end)
 477                 *p++ = '\0';
 478 }
 479
 480 EXPORT_SYMBOL(ide_fixstring);
 481
 482 /*
 483  * Needed for PCI irq sharing
 484  */
 485 int drive_is_ready (ide_drive_t *drive)
 486 {
 487         ide_hwif_t *hwif        = HWIF(drive);
 488         u8 stat                 = 0;
 489
 490         if (drive->waiting_for_dma)
 491                 return hwif->dma_ops->dma_test_irq(drive);
 492
 493 #if 0
 494         /* need to guarantee 400ns since last command was issued */
 495         udelay(1);
 496 #endif
 497
 498         /*
 499          * We do a passive status test under shared PCI interrupts on
 500          * cards that truly share the ATA side interrupt, but may also share
 501          * an interrupt with another pci card/device.  We make no assumptions
 502          * about possible isa-pnp and pci-pnp issues yet.
 503          */
 504         if (hwif->io_ports.ctl_addr)
 505                 stat = ide_read_altstatus(drive);
 506         else
 507                 /* Note: this may clear a pending IRQ!! */
 508                 stat = ide_read_status(drive);
 509
 510         if (stat & BUSY_STAT)
 511                 /* drive busy:  definitely not interrupting */
 512                 return 0;
 513
 514         /* drive ready: *might* be interrupting */
 515         return 1;
 516 }
 517
 518 EXPORT_SYMBOL(drive_is_ready);
 519
 520 /*
 521  * This routine busy-waits for the drive status to be not "busy".
 522  * It then checks the status for all of the "good" bits and none
 523  * of the "bad" bits, and if all is okay it returns 0.  All other
 524  * cases return error -- caller may then invoke ide_error().
 525  *
 526  * This routine should get fixed to not hog the cpu during extra long waits..
 527  * That could be done by busy-waiting for the first jiffy or two, and then
 528  * setting a timer to wake up at half second intervals thereafter,
 529  * until timeout is achieved, before timing out.
 530  */
 531 static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout, u8 *rstat)
 532 {
 533         unsigned long flags;
 534         int i;
 535         u8 stat;
 536
 537         udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
 538         stat = ide_read_status(drive);
 539
 540         if (stat & BUSY_STAT) {
 541                 local_irq_set(flags);
 542                 timeout += jiffies;
 543                 while ((stat = ide_read_status(drive)) & BUSY_STAT) {
 544                         if (time_after(jiffies, timeout)) {
 545                                 /*
 546                                  * One last read after the timeout in case
 547                                  * heavy interrupt load made us not make any
 548                                  * progress during the timeout..
 549                                  */
 550                                 stat = ide_read_status(drive);
 551                                 if (!(stat & BUSY_STAT))
 552                                         break;
 553
 554                                 local_irq_restore(flags);
 555                                 *rstat = stat;
 556                                 return -EBUSY;
 557                         }
 558                 }
 559                 local_irq_restore(flags);
 560         }
 561         /*
 562          * Allow status to settle, then read it again.
 563          * A few rare drives vastly violate the 400ns spec here,
 564          * so we'll wait up to 10usec for a "good" status
 565          * rather than expensively fail things immediately.
 566          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 567          */
 568         for (i = 0; i < 10; i++) {
 569                 udelay(1);
 570                 stat = ide_read_status(drive);
 571
 572                 if (OK_STAT(stat, good, bad)) {
 573                         *rstat = stat;
 574                         return 0;
 575                 }
 576         }
 577         *rstat = stat;
 578         return -EFAULT;
 579 }
 580
 581 /*
 582  * In case of error returns error value after doing "*startstop = ide_error()".
 583  * The caller should return the updated value of "startstop" in this case,
 584  * "startstop" is unchanged when the function returns 0.
 585  */
 586 int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
 587 {
 588         int err;
 589         u8 stat;
 590
 591         /* bail early if we've exceeded max_failures */
 592         if (drive->max_failures && (drive->failures > drive->max_failures)) {
 593                 *startstop = ide_stopped;
 594                 return 1;
 595         }
 596
 597         err = __ide_wait_stat(drive, good, bad, timeout, &stat);
 598
 599         if (err) {
 600                 char *s = (err == -EBUSY) ? "status timeout" : "status error";
 601                 *startstop = ide_error(drive, s, stat);
 602         }
 603
 604         return err;
 605 }
 606
 607 EXPORT_SYMBOL(ide_wait_stat);
 608
 609 /**
 610  *      ide_in_drive_list       -       look for drive in black/white list
 611  *      @id: drive identifier
 612  *      @drive_table: list to inspect
 613  *
 614  *      Look for a drive in the blacklist and the whitelist tables
 615  *      Returns 1 if the drive is found in the table.
 616  */
 617
 618 int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
 619 {
 620         for ( ; drive_table->id_model; drive_table++)
 621                 if ((!strcmp(drive_table->id_model, id->model)) &&
 622                     (!drive_table->id_firmware ||
 623                      strstr(id->fw_rev, drive_table->id_firmware)))
 624                         return 1;
 625         return 0;
 626 }
 627
 628 EXPORT_SYMBOL_GPL(ide_in_drive_list);
 629
 630 /*
 631  * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
 632  * We list them here and depend on the device side cable detection for them.
 633  *
 634  * Some optical devices with the buggy firmwares have the same problem.
 635  */
 636 static const struct drive_list_entry ivb_list[] = {
 637         { "QUANTUM FIREBALLlct10 05"    , "A03.0900"    },
 638         { "TSSTcorp CDDVDW SH-S202J"    , "SB00"        },
 639         { "TSSTcorp CDDVDW SH-S202J"    , "SB01"        },
 640         { "TSSTcorp CDDVDW SH-S202N"    , "SB00"        },
 641         { "TSSTcorp CDDVDW SH-S202N"    , "SB01"        },
 642         { "TSSTcorp CDDVDW SH-S202H"    , "SB00"        },
 643         { "TSSTcorp CDDVDW SH-S202H"    , "SB01"        },
 644         { NULL                          , NULL          }
 645 };
 646
 647 /*
 648  *  All hosts that use the 80c ribbon must use!
 649  *  The name is derived from upper byte of word 93 and the 80c ribbon.
 650  */
 651 u8 eighty_ninty_three (ide_drive_t *drive)
 652 {
 653         ide_hwif_t *hwif = drive->hwif;
 654         struct hd_driveid *id = drive->id;
 655         int ivb = ide_in_drive_list(id, ivb_list);
 656
 657         if (hwif->cbl == ATA_CBL_PATA40_SHORT)
 658                 return 1;
 659
 660         if (ivb)
 661                 printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
 662                                   drive->name);
 663
 664         if (ide_dev_is_sata(id) && !ivb)
 665                 return 1;
 666
 667         if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
 668                 goto no_80w;
 669
 670         /*
 671          * FIXME:
 672          * - change master/slave IDENTIFY order
 673          * - force bit13 (80c cable present) check also for !ivb devices
 674          *   (unless the slave device is pre-ATA3)
 675          */
 676         if ((id->hw_config & 0x4000) || (ivb && (id->hw_config & 0x2000)))
 677                 return 1;
 678
 679 no_80w:
 680         if (drive->udma33_warned == 1)
 681                 return 0;
 682
 683         printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
 684                             "limiting max speed to UDMA33\n",
 685                             drive->name,
 686                             hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
 687
 688         drive->udma33_warned = 1;
 689
 690         return 0;
 691 }
 692
 693 int ide_driveid_update(ide_drive_t *drive)
 694 {
 695         ide_hwif_t *hwif = drive->hwif;
 696         struct hd_driveid *id;
 697         unsigned long timeout, flags;
 698         u8 stat;
 699
 700         /*
 701          * Re-read drive->id for possible DMA mode
 702          * change (copied from ide-probe.c)
 703          */
 704
 705         SELECT_MASK(drive, 1);
 706         ide_set_irq(drive, 0);
 707         msleep(50);
 708         hwif->exec_command(hwif, WIN_IDENTIFY);
 709         timeout = jiffies + WAIT_WORSTCASE;
 710         do {
 711                 if (time_after(jiffies, timeout)) {
 712                         SELECT_MASK(drive, 0);
 713                         return 0;       /* drive timed-out */
 714                 }
 715
 716                 msleep(50);     /* give drive a breather */
 717                 stat = ide_read_altstatus(drive);
 718         } while (stat & BUSY_STAT);
 719
 720         msleep(50);     /* wait for IRQ and DRQ_STAT */
 721         stat = ide_read_status(drive);
 722
 723         if (!OK_STAT(stat, DRQ_STAT, BAD_R_STAT)) {
 724                 SELECT_MASK(drive, 0);
 725                 printk("%s: CHECK for good STATUS\n", drive->name);
 726                 return 0;
 727         }
 728         local_irq_save(flags);
 729         SELECT_MASK(drive, 0);
 730         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 731         if (!id) {
 732                 local_irq_restore(flags);
 733                 return 0;
 734         }
 735         hwif->input_data(drive, NULL, id, SECTOR_SIZE);
 736         (void)ide_read_status(drive);   /* clear drive IRQ */
 737         local_irq_enable();
 738         local_irq_restore(flags);
 739         ide_fix_driveid(id);
 740         if (id) {
 741                 drive->id->dma_ultra = id->dma_ultra;
 742                 drive->id->dma_mword = id->dma_mword;
 743                 drive->id->dma_1word = id->dma_1word;
 744                 /* anything more ? */
 745                 kfree(id);
 746
 747                 if (drive->using_dma && ide_id_dma_bug(drive))
 748                         ide_dma_off(drive);
 749         }
 750
 751         return 1;
 752 }
 753
 754 int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 755 {
 756         ide_hwif_t *hwif = drive->hwif;
 757         struct ide_io_ports *io_ports = &hwif->io_ports;
 758         int error = 0;
 759         u8 stat;
 760
 761 #ifdef CONFIG_BLK_DEV_IDEDMA
 762         if (hwif->dma_ops)      /* check if host supports DMA */
 763                 hwif->dma_ops->dma_host_set(drive, 0);
 764 #endif
 765
 766         /* Skip setting PIO flow-control modes on pre-EIDE drives */
 767         if ((speed & 0xf8) == XFER_PIO_0 && !(drive->id->capability & 0x08))
 768                 goto skip;
 769
 770         /*
 771          * Don't use ide_wait_cmd here - it will
 772          * attempt to set_geometry and recalibrate,
 773          * but for some reason these don't work at
 774          * this point (lost interrupt).
 775          */
 776         /*
 777          * Select the drive, and issue the SETFEATURES command
 778          */
 779         disable_irq_nosync(hwif->irq);
 780
 781         /*
 782          *      FIXME: we race against the running IRQ here if
 783          *      this is called from non IRQ context. If we use
 784          *      disable_irq() we hang on the error path. Work
 785          *      is needed.
 786          */
 787
 788         udelay(1);
 789         SELECT_DRIVE(drive);
 790         SELECT_MASK(drive, 0);
 791         udelay(1);
 792         ide_set_irq(drive, 0);
 793         hwif->OUTB(speed, io_ports->nsect_addr);
 794         hwif->OUTB(SETFEATURES_XFER, io_ports->feature_addr);
 795         hwif->exec_command(hwif, WIN_SETFEATURES);
 796         if (drive->quirk_list == 2)
 797                 ide_set_irq(drive, 1);
 798
 799         error = __ide_wait_stat(drive, drive->ready_stat,
 800                                 BUSY_STAT|DRQ_STAT|ERR_STAT,
 801                                 WAIT_CMD, &stat);
 802
 803         SELECT_MASK(drive, 0);
 804
 805         enable_irq(hwif->irq);
 806
 807         if (error) {
 808                 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
 809                 return error;
 810         }
 811
 812         drive->id->dma_ultra &= ~0xFF00;
 813         drive->id->dma_mword &= ~0x0F00;
 814         drive->id->dma_1word &= ~0x0F00;
 815
 816  skip:
 817 #ifdef CONFIG_BLK_DEV_IDEDMA
 818         if ((speed >= XFER_SW_DMA_0 || (hwif->host_flags & IDE_HFLAG_VDMA)) &&
 819             drive->using_dma)
 820                 hwif->dma_ops->dma_host_set(drive, 1);
 821         else if (hwif->dma_ops) /* check if host supports DMA */
 822                 ide_dma_off_quietly(drive);
 823 #endif
 824
 825         switch(speed) {
 826                 case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
 827                 case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
 828                 case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
 829                 case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
 830                 case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
 831                 case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
 832                 case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
 833                 case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
 834                 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
 835                 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
 836                 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
 837                 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
 838                 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
 839                 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
 840                 default: break;
 841         }
 842         if (!drive->init_speed)
 843                 drive->init_speed = speed;
 844         drive->current_speed = speed;
 845         return error;
 846 }
 847
 848 /*
 849  * This should get invoked any time we exit the driver to
 850  * wait for an interrupt response from a drive.  handler() points
 851  * at the appropriate code to handle the next interrupt, and a
 852  * timer is started to prevent us from waiting forever in case
 853  * something goes wrong (see the ide_timer_expiry() handler later on).
 854  *
 855  * See also ide_execute_command
 856  */
 857 static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 858                       unsigned int timeout, ide_expiry_t *expiry)
 859 {
 860         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 861
 862         BUG_ON(hwgroup->handler);
 863         hwgroup->handler        = handler;
 864         hwgroup->expiry         = expiry;
 865         hwgroup->timer.expires  = jiffies + timeout;
 866         hwgroup->req_gen_timer  = hwgroup->req_gen;
 867         add_timer(&hwgroup->timer);
 868 }
 869
 870 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 871                       unsigned int timeout, ide_expiry_t *expiry)
 872 {
 873         unsigned long flags;
 874         spin_lock_irqsave(&ide_lock, flags);
 875         __ide_set_handler(drive, handler, timeout, expiry);
 876         spin_unlock_irqrestore(&ide_lock, flags);
 877 }
 878
 879 EXPORT_SYMBOL(ide_set_handler);
 880
 881 /**
 882  *      ide_execute_command     -       execute an IDE command
 883  *      @drive: IDE drive to issue the command against
 884  *      @command: command byte to write
 885  *      @handler: handler for next phase
 886  *      @timeout: timeout for command
 887  *      @expiry:  handler to run on timeout
 888  *
 889  *      Helper function to issue an IDE command. This handles the
 890  *      atomicity requirements, command timing and ensures that the
 891  *      handler and IRQ setup do not race. All IDE command kick off
 892  *      should go via this function or do equivalent locking.
 893  */
 894
 895 void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler,
 896                          unsigned timeout, ide_expiry_t *expiry)
 897 {
 898         unsigned long flags;
 899         ide_hwif_t *hwif = HWIF(drive);
 900
 901         spin_lock_irqsave(&ide_lock, flags);
 902         __ide_set_handler(drive, handler, timeout, expiry);
 903         hwif->exec_command(hwif, cmd);
 904         /*
 905          * Drive takes 400nS to respond, we must avoid the IRQ being
 906          * serviced before that.
 907          *
 908          * FIXME: we could skip this delay with care on non shared devices
 909          */
 910         ndelay(400);
 911         spin_unlock_irqrestore(&ide_lock, flags);
 912 }
 913 EXPORT_SYMBOL(ide_execute_command);
 914
 915 void ide_execute_pkt_cmd(ide_drive_t *drive)
 916 {
 917         ide_hwif_t *hwif = drive->hwif;
 918         unsigned long flags;
 919
 920         spin_lock_irqsave(&ide_lock, flags);
 921         hwif->exec_command(hwif, WIN_PACKETCMD);
 922         ndelay(400);
 923         spin_unlock_irqrestore(&ide_lock, flags);
 924 }
 925 EXPORT_SYMBOL_GPL(ide_execute_pkt_cmd);
 926
 927 static inline void ide_complete_drive_reset(ide_drive_t *drive, int err)
 928 {
 929         struct request *rq = drive->hwif->hwgroup->rq;
 930
 931         if (rq && blk_special_request(rq) && rq->cmd[0] == REQ_DRIVE_RESET)
 932                 ide_end_request(drive, err ? err : 1, 0);
 933 }
 934
 935 /* needed below */
 936 static ide_startstop_t do_reset1 (ide_drive_t *, int);
 937
 938 /*
 939  * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 940  * during an atapi drive reset operation. If the drive has not yet responded,
 941  * and we have not yet hit our maximum waiting time, then the timer is restarted
 942  * for another 50ms.
 943  */
 944 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
 945 {
 946         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 947         u8 stat;
 948
 949         SELECT_DRIVE(drive);
 950         udelay (10);
 951         stat = ide_read_status(drive);
 952
 953         if (OK_STAT(stat, 0, BUSY_STAT))
 954                 printk("%s: ATAPI reset complete\n", drive->name);
 955         else {
 956                 if (time_before(jiffies, hwgroup->poll_timeout)) {
 957                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
 958                         /* continue polling */
 959                         return ide_started;
 960                 }
 961                 /* end of polling */
 962                 hwgroup->polling = 0;
 963                 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
 964                                 drive->name, stat);
 965                 /* do it the old fashioned way */
 966                 return do_reset1(drive, 1);
 967         }
 968         /* done polling */
 969         hwgroup->polling = 0;
 970         ide_complete_drive_reset(drive, 0);
 971         return ide_stopped;
 972 }
 973
 974 /*
 975  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 976  * during an ide reset operation. If the drives have not yet responded,
 977  * and we have not yet hit our maximum waiting time, then the timer is restarted
 978  * for another 50ms.
 979  */
 980 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
 981 {
 982         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 983         ide_hwif_t *hwif        = HWIF(drive);
 984         const struct ide_port_ops *port_ops = hwif->port_ops;
 985         u8 tmp;
 986         int err = 0;
 987
 988         if (port_ops && port_ops->reset_poll) {
 989                 err = port_ops->reset_poll(drive);
 990                 if (err) {
 991                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
 992                                 hwif->name, drive->name);
 993                         goto out;
 994                 }
 995         }
 996
 997         tmp = ide_read_status(drive);
 998
 999         if (!OK_STAT(tmp, 0, BUSY_STAT)) {
1000                 if (time_before(jiffies, hwgroup->poll_timeout)) {
1001                         ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1002                         /* continue polling */
1003                         return ide_started;
1004                 }
1005                 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
1006                 drive->failures++;
1007                 err = -EIO;
1008         } else  {
1009                 printk("%s: reset: ", hwif->name);
1010                 tmp = ide_read_error(drive);
1011
1012                 if (tmp == 1) {
1013                         printk("success\n");
1014                         drive->failures = 0;
1015                 } else {
1016                         drive->failures++;
1017                         printk("master: ");
1018                         switch (tmp & 0x7f) {
1019                                 case 1: printk("passed");
1020                                         break;
1021                                 case 2: printk("formatter device error");
1022                                         break;
1023                                 case 3: printk("sector buffer error");
1024                                         break;
1025                                 case 4: printk("ECC circuitry error");
1026                                         break;
1027                                 case 5: printk("controlling MPU error");
1028                                         break;
1029                                 default:printk("error (0x%02x?)", tmp);
1030                         }
1031                         if (tmp & 0x80)
1032                                 printk("; slave: failed");
1033                         printk("\n");
1034                         err = -EIO;
1035                 }
1036         }
1037 out:
1038         hwgroup->polling = 0;   /* done polling */
1039         ide_complete_drive_reset(drive, err);
1040         return ide_stopped;
1041 }
1042
1043 static void ide_disk_pre_reset(ide_drive_t *drive)
1044 {
1045         int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;
1046
1047         drive->special.all = 0;
1048         drive->special.b.set_geometry = legacy;
1049         drive->special.b.recalibrate  = legacy;
1050         drive->mult_count = 0;
1051         if (!drive->keep_settings && !drive->using_dma)
1052                 drive->mult_req = 0;
1053         if (drive->mult_req != drive->mult_count)
1054                 drive->special.b.set_multmode = 1;
1055 }
1056
1057 static void pre_reset(ide_drive_t *drive)
1058 {
1059         const struct ide_port_ops *port_ops = drive->hwif->port_ops;
1060
1061         if (drive->media == ide_disk)
1062                 ide_disk_pre_reset(drive);
1063         else
1064                 drive->post_reset = 1;
1065
1066         if (drive->using_dma) {
1067                 if (drive->crc_count)
1068                         ide_check_dma_crc(drive);
1069                 else
1070                         ide_dma_off(drive);
1071         }
1072
1073         if (!drive->keep_settings) {
1074                 if (!drive->using_dma) {
1075                         drive->unmask = 0;
1076                         drive->io_32bit = 0;
1077                 }
1078                 return;
1079         }
1080
1081         if (port_ops && port_ops->pre_reset)
1082                 port_ops->pre_reset(drive);
1083
1084         if (drive->current_speed != 0xff)
1085                 drive->desired_speed = drive->current_speed;
1086         drive->current_speed = 0xff;
1087 }
1088
1089 /*
1090  * do_reset1() attempts to recover a confused drive by resetting it.
1091  * Unfortunately, resetting a disk drive actually resets all devices on
1092  * the same interface, so it can really be thought of as resetting the
1093  * interface rather than resetting the drive.
1094  *
1095  * ATAPI devices have their own reset mechanism which allows them to be
1096  * individually reset without clobbering other devices on the same interface.
1097  *
1098  * Unfortunately, the IDE interface does not generate an interrupt to let
1099  * us know when the reset operation has finished, so we must poll for this.
1100  * Equally poor, though, is the fact that this may a very long time to complete,
1101  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
1102  * we set a timer to poll at 50ms intervals.
1103  */
1104 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
1105 {
1106         unsigned int unit;
1107         unsigned long flags;
1108         ide_hwif_t *hwif;
1109         ide_hwgroup_t *hwgroup;
1110         struct ide_io_ports *io_ports;
1111         const struct ide_port_ops *port_ops;
1112         u8 ctl;
1113
1114         spin_lock_irqsave(&ide_lock, flags);
1115         hwif = HWIF(drive);
1116         hwgroup = HWGROUP(drive);
1117
1118         io_ports = &hwif->io_ports;
1119
1120         /* We must not reset with running handlers */
1121         BUG_ON(hwgroup->handler != NULL);
1122
1123         /* For an ATAPI device, first try an ATAPI SRST. */
1124         if (drive->media != ide_disk && !do_not_try_atapi) {
1125                 pre_reset(drive);
1126                 SELECT_DRIVE(drive);
1127                 udelay (20);
1128                 hwif->exec_command(hwif, WIN_SRST);
1129                 ndelay(400);
1130                 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1131                 hwgroup->polling = 1;
1132                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1133                 spin_unlock_irqrestore(&ide_lock, flags);
1134                 return ide_started;
1135         }
1136
1137         /*
1138          * First, reset any device state data we were maintaining
1139          * for any of the drives on this interface.
1140          */
1141         for (unit = 0; unit < MAX_DRIVES; ++unit)
1142                 pre_reset(&hwif->drives[unit]);
1143
1144         if (io_ports->ctl_addr == 0) {
1145                 spin_unlock_irqrestore(&ide_lock, flags);
1146                 ide_complete_drive_reset(drive, -ENXIO);
1147                 return ide_stopped;
1148         }
1149
1150         /*
1151          * Note that we also set nIEN while resetting the device,
1152          * to mask unwanted interrupts from the interface during the reset.
1153          * However, due to the design of PC hardware, this will cause an
1154          * immediate interrupt due to the edge transition it produces.
1155          * This single interrupt gives us a "fast poll" for drives that
1156          * recover from reset very quickly, saving us the first 50ms wait time.
1157          */
1158         /* set SRST and nIEN */
1159         hwif->OUTBSYNC(hwif, ATA_DEVCTL_OBS | 6, io_ports->ctl_addr);
1160         /* more than enough time */
1161         udelay(10);
1162         if (drive->quirk_list == 2)
1163                 ctl = ATA_DEVCTL_OBS;           /* clear SRST and nIEN */
1164         else
1165                 ctl = ATA_DEVCTL_OBS | 2;       /* clear SRST, leave nIEN */
1166         hwif->OUTBSYNC(hwif, ctl, io_ports->ctl_addr);
1167         /* more than enough time */
1168         udelay(10);
1169         hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1170         hwgroup->polling = 1;
1171         __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1172
1173         /*
1174          * Some weird controller like resetting themselves to a strange
1175          * state when the disks are reset this way. At least, the Winbond
1176          * 553 documentation says that
1177          */
1178         port_ops = hwif->port_ops;
1179         if (port_ops && port_ops->resetproc)
1180                 port_ops->resetproc(drive);
1181
1182         spin_unlock_irqrestore(&ide_lock, flags);
1183         return ide_started;
1184 }
1185
1186 /*
1187  * ide_do_reset() is the entry point to the drive/interface reset code.
1188  */
1189
1190 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1191 {
1192         return do_reset1(drive, 0);
1193 }
1194
1195 EXPORT_SYMBOL(ide_do_reset);
1196
1197 /*
1198  * ide_wait_not_busy() waits for the currently selected device on the hwif
1199  * to report a non-busy status, see comments in ide_probe_port().
1200  */
1201 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1202 {
1203         u8 stat = 0;
1204
1205         while(timeout--) {
1206                 /*
1207                  * Turn this into a schedule() sleep once I'm sure
1208                  * about locking issues (2.5 work ?).
1209                  */
1210                 mdelay(1);
1211                 stat = hwif->INB(hwif->io_ports.status_addr);
1212                 if ((stat & BUSY_STAT) == 0)
1213                         return 0;
1214                 /*
1215                  * Assume a value of 0xff means nothing is connected to
1216                  * the interface and it doesn't implement the pull-down
1217                  * resistor on D7.
1218                  */
1219                 if (stat == 0xff)
1220                         return -ENODEV;
1221                 touch_softlockup_watchdog();
1222                 touch_nmi_watchdog();
1223         }
1224         return -EBUSY;
1225 }
1226
1227 EXPORT_SYMBOL_GPL(ide_wait_not_busy);
1228