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_status(ide_hwif_t *hwif)
 115 {
 116         if (hwif->host_flags & IDE_HFLAG_MMIO)
 117                 return readb((void __iomem *)hwif->io_ports.status_addr);
 118         else
 119                 return inb(hwif->io_ports.status_addr);
 120 }
 121
 122 static u8 ide_read_altstatus(ide_hwif_t *hwif)
 123 {
 124         if (hwif->host_flags & IDE_HFLAG_MMIO)
 125                 return readb((void __iomem *)hwif->io_ports.ctl_addr);
 126         else
 127                 return inb(hwif->io_ports.ctl_addr);
 128 }
 129
 130 static u8 ide_read_sff_dma_status(ide_hwif_t *hwif)
 131 {
 132         if (hwif->host_flags & IDE_HFLAG_MMIO)
 133                 return readb((void __iomem *)(hwif->dma_base + ATA_DMA_STATUS));
 134         else
 135                 return inb(hwif->dma_base + ATA_DMA_STATUS);
 136 }
 137
 138 static void ide_set_irq(ide_hwif_t *hwif, int on)
 139 {
 140         u8 ctl = ATA_DEVCTL_OBS;
 141
 142         if (on == 4) { /* hack for SRST */
 143                 ctl |= 4;
 144                 on &= ~4;
 145         }
 146
 147         ctl |= on ? 0 : 2;
 148
 149         if (hwif->host_flags & IDE_HFLAG_MMIO)
 150                 writeb(ctl, (void __iomem *)hwif->io_ports.ctl_addr);
 151         else
 152                 outb(ctl, hwif->io_ports.ctl_addr);
 153 }
 154
 155 static void ide_tf_load(ide_drive_t *drive, ide_task_t *task)
 156 {
 157         ide_hwif_t *hwif = drive->hwif;
 158         struct ide_io_ports *io_ports = &hwif->io_ports;
 159         struct ide_taskfile *tf = &task->tf;
 160         void (*tf_outb)(u8 addr, unsigned long port);
 161         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 162         u8 HIHI = (task->tf_flags & IDE_TFLAG_LBA48) ? 0xE0 : 0xEF;
 163
 164         if (mmio)
 165                 tf_outb = ide_mm_outb;
 166         else
 167                 tf_outb = ide_outb;
 168
 169         if (task->tf_flags & IDE_TFLAG_FLAGGED)
 170                 HIHI = 0xFF;
 171
 172         if (task->tf_flags & IDE_TFLAG_OUT_DATA) {
 173                 u16 data = (tf->hob_data << 8) | tf->data;
 174
 175                 if (mmio)
 176                         writew(data, (void __iomem *)io_ports->data_addr);
 177                 else
 178                         outw(data, io_ports->data_addr);
 179         }
 180
 181         if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
 182                 tf_outb(tf->hob_feature, io_ports->feature_addr);
 183         if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
 184                 tf_outb(tf->hob_nsect, io_ports->nsect_addr);
 185         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
 186                 tf_outb(tf->hob_lbal, io_ports->lbal_addr);
 187         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
 188                 tf_outb(tf->hob_lbam, io_ports->lbam_addr);
 189         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
 190                 tf_outb(tf->hob_lbah, io_ports->lbah_addr);
 191
 192         if (task->tf_flags & IDE_TFLAG_OUT_FEATURE)
 193                 tf_outb(tf->feature, io_ports->feature_addr);
 194         if (task->tf_flags & IDE_TFLAG_OUT_NSECT)
 195                 tf_outb(tf->nsect, io_ports->nsect_addr);
 196         if (task->tf_flags & IDE_TFLAG_OUT_LBAL)
 197                 tf_outb(tf->lbal, io_ports->lbal_addr);
 198         if (task->tf_flags & IDE_TFLAG_OUT_LBAM)
 199                 tf_outb(tf->lbam, io_ports->lbam_addr);
 200         if (task->tf_flags & IDE_TFLAG_OUT_LBAH)
 201                 tf_outb(tf->lbah, io_ports->lbah_addr);
 202
 203         if (task->tf_flags & IDE_TFLAG_OUT_DEVICE)
 204                 tf_outb((tf->device & HIHI) | drive->select.all,
 205                          io_ports->device_addr);
 206 }
 207
 208 static void ide_tf_read(ide_drive_t *drive, ide_task_t *task)
 209 {
 210         ide_hwif_t *hwif = drive->hwif;
 211         struct ide_io_ports *io_ports = &hwif->io_ports;
 212         struct ide_taskfile *tf = &task->tf;
 213         void (*tf_outb)(u8 addr, unsigned long port);
 214         u8 (*tf_inb)(unsigned long port);
 215         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 216
 217         if (mmio) {
 218                 tf_outb = ide_mm_outb;
 219                 tf_inb  = ide_mm_inb;
 220         } else {
 221                 tf_outb = ide_outb;
 222                 tf_inb  = ide_inb;
 223         }
 224
 225         if (task->tf_flags & IDE_TFLAG_IN_DATA) {
 226                 u16 data;
 227
 228                 if (mmio)
 229                         data = readw((void __iomem *)io_ports->data_addr);
 230                 else
 231                         data = inw(io_ports->data_addr);
 232
 233                 tf->data = data & 0xff;
 234                 tf->hob_data = (data >> 8) & 0xff;
 235         }
 236
 237         /* be sure we're looking at the low order bits */
 238         tf_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
 239
 240         if (task->tf_flags & IDE_TFLAG_IN_NSECT)
 241                 tf->nsect  = tf_inb(io_ports->nsect_addr);
 242         if (task->tf_flags & IDE_TFLAG_IN_LBAL)
 243                 tf->lbal   = tf_inb(io_ports->lbal_addr);
 244         if (task->tf_flags & IDE_TFLAG_IN_LBAM)
 245                 tf->lbam   = tf_inb(io_ports->lbam_addr);
 246         if (task->tf_flags & IDE_TFLAG_IN_LBAH)
 247                 tf->lbah   = tf_inb(io_ports->lbah_addr);
 248         if (task->tf_flags & IDE_TFLAG_IN_DEVICE)
 249                 tf->device = tf_inb(io_ports->device_addr);
 250
 251         if (task->tf_flags & IDE_TFLAG_LBA48) {
 252                 tf_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
 253
 254                 if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
 255                         tf->hob_feature = tf_inb(io_ports->feature_addr);
 256                 if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
 257                         tf->hob_nsect   = tf_inb(io_ports->nsect_addr);
 258                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
 259                         tf->hob_lbal    = tf_inb(io_ports->lbal_addr);
 260                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
 261                         tf->hob_lbam    = tf_inb(io_ports->lbam_addr);
 262                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
 263                         tf->hob_lbah    = tf_inb(io_ports->lbah_addr);
 264         }
 265 }
 266
 267 /*
 268  * Some localbus EIDE interfaces require a special access sequence
 269  * when using 32-bit I/O instructions to transfer data.  We call this
 270  * the "vlb_sync" sequence, which consists of three successive reads
 271  * of the sector count register location, with interrupts disabled
 272  * to ensure that the reads all happen together.
 273  */
 274 static void ata_vlb_sync(unsigned long port)
 275 {
 276         (void)inb(port);
 277         (void)inb(port);
 278         (void)inb(port);
 279 }
 280
 281 /*
 282  * This is used for most PIO data transfers *from* the IDE interface
 283  *
 284  * These routines will round up any request for an odd number of bytes,
 285  * so if an odd len is specified, be sure that there's at least one
 286  * extra byte allocated for the buffer.
 287  */
 288 static void ata_input_data(ide_drive_t *drive, struct request *rq,
 289                            void *buf, unsigned int len)
 290 {
 291         ide_hwif_t *hwif = drive->hwif;
 292         struct ide_io_ports *io_ports = &hwif->io_ports;
 293         unsigned long data_addr = io_ports->data_addr;
 294         u8 io_32bit = drive->io_32bit;
 295         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 296
 297         len++;
 298
 299         if (io_32bit) {
 300                 unsigned long uninitialized_var(flags);
 301
 302                 if ((io_32bit & 2) && !mmio) {
 303                         local_irq_save(flags);
 304                         ata_vlb_sync(io_ports->nsect_addr);
 305                 }
 306
 307                 if (mmio)
 308                         __ide_mm_insl((void __iomem *)data_addr, buf, len / 4);
 309                 else
 310                         insl(data_addr, buf, len / 4);
 311
 312                 if ((io_32bit & 2) && !mmio)
 313                         local_irq_restore(flags);
 314
 315                 if ((len & 3) >= 2) {
 316                         if (mmio)
 317                                 __ide_mm_insw((void __iomem *)data_addr,
 318                                                 (u8 *)buf + (len & ~3), 1);
 319                         else
 320                                 insw(data_addr, (u8 *)buf + (len & ~3), 1);
 321                 }
 322         } else {
 323                 if (mmio)
 324                         __ide_mm_insw((void __iomem *)data_addr, buf, len / 2);
 325                 else
 326                         insw(data_addr, buf, len / 2);
 327         }
 328 }
 329
 330 /*
 331  * This is used for most PIO data transfers *to* the IDE interface
 332  */
 333 static void ata_output_data(ide_drive_t *drive, struct request *rq,
 334                             void *buf, unsigned int len)
 335 {
 336         ide_hwif_t *hwif = drive->hwif;
 337         struct ide_io_ports *io_ports = &hwif->io_ports;
 338         unsigned long data_addr = io_ports->data_addr;
 339         u8 io_32bit = drive->io_32bit;
 340         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 341
 342         if (io_32bit) {
 343                 unsigned long uninitialized_var(flags);
 344
 345                 if ((io_32bit & 2) && !mmio) {
 346                         local_irq_save(flags);
 347                         ata_vlb_sync(io_ports->nsect_addr);
 348                 }
 349
 350                 if (mmio)
 351                         __ide_mm_outsl((void __iomem *)data_addr, buf, len / 4);
 352                 else
 353                         outsl(data_addr, buf, len / 4);
 354
 355                 if ((io_32bit & 2) && !mmio)
 356                         local_irq_restore(flags);
 357
 358                 if ((len & 3) >= 2) {
 359                         if (mmio)
 360                                 __ide_mm_outsw((void __iomem *)data_addr,
 361                                                  (u8 *)buf + (len & ~3), 1);
 362                         else
 363                                 outsw(data_addr, (u8 *)buf + (len & ~3), 1);
 364                 }
 365         } else {
 366                 if (mmio)
 367                         __ide_mm_outsw((void __iomem *)data_addr, buf, len / 2);
 368                 else
 369                         outsw(data_addr, buf, len / 2);
 370         }
 371 }
 372
 373 void default_hwif_transport(ide_hwif_t *hwif)
 374 {
 375         hwif->exec_command        = ide_exec_command;
 376         hwif->read_status         = ide_read_status;
 377         hwif->read_altstatus      = ide_read_altstatus;
 378         hwif->read_sff_dma_status = ide_read_sff_dma_status;
 379
 380         hwif->set_irq     = ide_set_irq;
 381
 382         hwif->tf_load     = ide_tf_load;
 383         hwif->tf_read     = ide_tf_read;
 384
 385         hwif->input_data  = ata_input_data;
 386         hwif->output_data = ata_output_data;
 387 }
 388
 389 void ide_fix_driveid (struct hd_driveid *id)
 390 {
 391 #ifndef __LITTLE_ENDIAN
 392 # ifdef __BIG_ENDIAN
 393         int i;
 394         u16 *stringcast;
 395
 396         id->config         = __le16_to_cpu(id->config);
 397         id->cyls           = __le16_to_cpu(id->cyls);
 398         id->reserved2      = __le16_to_cpu(id->reserved2);
 399         id->heads          = __le16_to_cpu(id->heads);
 400         id->track_bytes    = __le16_to_cpu(id->track_bytes);
 401         id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
 402         id->sectors        = __le16_to_cpu(id->sectors);
 403         id->vendor0        = __le16_to_cpu(id->vendor0);
 404         id->vendor1        = __le16_to_cpu(id->vendor1);
 405         id->vendor2        = __le16_to_cpu(id->vendor2);
 406         stringcast = (u16 *)&id->serial_no[0];
 407         for (i = 0; i < (20/2); i++)
 408                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 409         id->buf_type       = __le16_to_cpu(id->buf_type);
 410         id->buf_size       = __le16_to_cpu(id->buf_size);
 411         id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
 412         stringcast = (u16 *)&id->fw_rev[0];
 413         for (i = 0; i < (8/2); i++)
 414                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 415         stringcast = (u16 *)&id->model[0];
 416         for (i = 0; i < (40/2); i++)
 417                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 418         id->dword_io       = __le16_to_cpu(id->dword_io);
 419         id->reserved50     = __le16_to_cpu(id->reserved50);
 420         id->field_valid    = __le16_to_cpu(id->field_valid);
 421         id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
 422         id->cur_heads      = __le16_to_cpu(id->cur_heads);
 423         id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
 424         id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
 425         id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
 426         id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
 427         id->dma_1word      = __le16_to_cpu(id->dma_1word);
 428         id->dma_mword      = __le16_to_cpu(id->dma_mword);
 429         id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
 430         id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
 431         id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
 432         id->eide_pio       = __le16_to_cpu(id->eide_pio);
 433         id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
 434         for (i = 0; i < 2; ++i)
 435                 id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
 436         for (i = 0; i < 4; ++i)
 437                 id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
 438         id->queue_depth    = __le16_to_cpu(id->queue_depth);
 439         for (i = 0; i < 4; ++i)
 440                 id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
 441         id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
 442         id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
 443         id->command_set_1  = __le16_to_cpu(id->command_set_1);
 444         id->command_set_2  = __le16_to_cpu(id->command_set_2);
 445         id->cfsse          = __le16_to_cpu(id->cfsse);
 446         id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
 447         id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
 448         id->csf_default    = __le16_to_cpu(id->csf_default);
 449         id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
 450         id->trseuc         = __le16_to_cpu(id->trseuc);
 451         id->trsEuc         = __le16_to_cpu(id->trsEuc);
 452         id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
 453         id->mprc           = __le16_to_cpu(id->mprc);
 454         id->hw_config      = __le16_to_cpu(id->hw_config);
 455         id->acoustic       = __le16_to_cpu(id->acoustic);
 456         id->msrqs          = __le16_to_cpu(id->msrqs);
 457         id->sxfert         = __le16_to_cpu(id->sxfert);
 458         id->sal            = __le16_to_cpu(id->sal);
 459         id->spg            = __le32_to_cpu(id->spg);
 460         id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
 461         for (i = 0; i < 22; i++)
 462                 id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
 463         id->last_lun       = __le16_to_cpu(id->last_lun);
 464         id->word127        = __le16_to_cpu(id->word127);
 465         id->dlf            = __le16_to_cpu(id->dlf);
 466         id->csfo           = __le16_to_cpu(id->csfo);
 467         for (i = 0; i < 26; i++)
 468                 id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
 469         id->word156        = __le16_to_cpu(id->word156);
 470         for (i = 0; i < 3; i++)
 471                 id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
 472         id->cfa_power      = __le16_to_cpu(id->cfa_power);
 473         for (i = 0; i < 14; i++)
 474                 id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
 475         for (i = 0; i < 31; i++)
 476                 id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
 477         for (i = 0; i < 48; i++)
 478                 id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
 479         id->integrity_word  = __le16_to_cpu(id->integrity_word);
 480 # else
 481 #  error "Please fix <asm/byteorder.h>"
 482 # endif
 483 #endif
 484 }
 485
 486 /*
 487  * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
 488  * removing leading/trailing blanks and compressing internal blanks.
 489  * It is primarily used to tidy up the model name/number fields as
 490  * returned by the WIN_[P]IDENTIFY commands.
 491  */
 492
 493 void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
 494 {
 495         u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
 496
 497         if (byteswap) {
 498                 /* convert from big-endian to host byte order */
 499                 for (p = end ; p != s;) {
 500                         unsigned short *pp = (unsigned short *) (p -= 2);
 501                         *pp = ntohs(*pp);
 502                 }
 503         }
 504         /* strip leading blanks */
 505         while (s != end && *s == ' ')
 506                 ++s;
 507         /* compress internal blanks and strip trailing blanks */
 508         while (s != end && *s) {
 509                 if (*s++ != ' ' || (s != end && *s && *s != ' '))
 510                         *p++ = *(s-1);
 511         }
 512         /* wipe out trailing garbage */
 513         while (p != end)
 514                 *p++ = '\0';
 515 }
 516
 517 EXPORT_SYMBOL(ide_fixstring);
 518
 519 /*
 520  * Needed for PCI irq sharing
 521  */
 522 int drive_is_ready (ide_drive_t *drive)
 523 {
 524         ide_hwif_t *hwif        = HWIF(drive);
 525         u8 stat                 = 0;
 526
 527         if (drive->waiting_for_dma)
 528                 return hwif->dma_ops->dma_test_irq(drive);
 529
 530 #if 0
 531         /* need to guarantee 400ns since last command was issued */
 532         udelay(1);
 533 #endif
 534
 535         /*
 536          * We do a passive status test under shared PCI interrupts on
 537          * cards that truly share the ATA side interrupt, but may also share
 538          * an interrupt with another pci card/device.  We make no assumptions
 539          * about possible isa-pnp and pci-pnp issues yet.
 540          */
 541         if (hwif->io_ports.ctl_addr)
 542                 stat = hwif->read_altstatus(hwif);
 543         else
 544                 /* Note: this may clear a pending IRQ!! */
 545                 stat = hwif->read_status(hwif);
 546
 547         if (stat & BUSY_STAT)
 548                 /* drive busy:  definitely not interrupting */
 549                 return 0;
 550
 551         /* drive ready: *might* be interrupting */
 552         return 1;
 553 }
 554
 555 EXPORT_SYMBOL(drive_is_ready);
 556
 557 /*
 558  * This routine busy-waits for the drive status to be not "busy".
 559  * It then checks the status for all of the "good" bits and none
 560  * of the "bad" bits, and if all is okay it returns 0.  All other
 561  * cases return error -- caller may then invoke ide_error().
 562  *
 563  * This routine should get fixed to not hog the cpu during extra long waits..
 564  * That could be done by busy-waiting for the first jiffy or two, and then
 565  * setting a timer to wake up at half second intervals thereafter,
 566  * until timeout is achieved, before timing out.
 567  */
 568 static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout, u8 *rstat)
 569 {
 570         ide_hwif_t *hwif = drive->hwif;
 571         unsigned long flags;
 572         int i;
 573         u8 stat;
 574
 575         udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
 576         stat = hwif->read_status(hwif);
 577
 578         if (stat & BUSY_STAT) {
 579                 local_irq_set(flags);
 580                 timeout += jiffies;
 581                 while ((stat = hwif->read_status(hwif)) & BUSY_STAT) {
 582                         if (time_after(jiffies, timeout)) {
 583                                 /*
 584                                  * One last read after the timeout in case
 585                                  * heavy interrupt load made us not make any
 586                                  * progress during the timeout..
 587                                  */
 588                                 stat = hwif->read_status(hwif);
 589                                 if (!(stat & BUSY_STAT))
 590                                         break;
 591
 592                                 local_irq_restore(flags);
 593                                 *rstat = stat;
 594                                 return -EBUSY;
 595                         }
 596                 }
 597                 local_irq_restore(flags);
 598         }
 599         /*
 600          * Allow status to settle, then read it again.
 601          * A few rare drives vastly violate the 400ns spec here,
 602          * so we'll wait up to 10usec for a "good" status
 603          * rather than expensively fail things immediately.
 604          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 605          */
 606         for (i = 0; i < 10; i++) {
 607                 udelay(1);
 608                 stat = hwif->read_status(hwif);
 609
 610                 if (OK_STAT(stat, good, bad)) {
 611                         *rstat = stat;
 612                         return 0;
 613                 }
 614         }
 615         *rstat = stat;
 616         return -EFAULT;
 617 }
 618
 619 /*
 620  * In case of error returns error value after doing "*startstop = ide_error()".
 621  * The caller should return the updated value of "startstop" in this case,
 622  * "startstop" is unchanged when the function returns 0.
 623  */
 624 int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
 625 {
 626         int err;
 627         u8 stat;
 628
 629         /* bail early if we've exceeded max_failures */
 630         if (drive->max_failures && (drive->failures > drive->max_failures)) {
 631                 *startstop = ide_stopped;
 632                 return 1;
 633         }
 634
 635         err = __ide_wait_stat(drive, good, bad, timeout, &stat);
 636
 637         if (err) {
 638                 char *s = (err == -EBUSY) ? "status timeout" : "status error";
 639                 *startstop = ide_error(drive, s, stat);
 640         }
 641
 642         return err;
 643 }
 644
 645 EXPORT_SYMBOL(ide_wait_stat);
 646
 647 /**
 648  *      ide_in_drive_list       -       look for drive in black/white list
 649  *      @id: drive identifier
 650  *      @drive_table: list to inspect
 651  *
 652  *      Look for a drive in the blacklist and the whitelist tables
 653  *      Returns 1 if the drive is found in the table.
 654  */
 655
 656 int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
 657 {
 658         for ( ; drive_table->id_model; drive_table++)
 659                 if ((!strcmp(drive_table->id_model, id->model)) &&
 660                     (!drive_table->id_firmware ||
 661                      strstr(id->fw_rev, drive_table->id_firmware)))
 662                         return 1;
 663         return 0;
 664 }
 665
 666 EXPORT_SYMBOL_GPL(ide_in_drive_list);
 667
 668 /*
 669  * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
 670  * We list them here and depend on the device side cable detection for them.
 671  *
 672  * Some optical devices with the buggy firmwares have the same problem.
 673  */
 674 static const struct drive_list_entry ivb_list[] = {
 675         { "QUANTUM FIREBALLlct10 05"    , "A03.0900"    },
 676         { "TSSTcorp CDDVDW SH-S202J"    , "SB00"        },
 677         { "TSSTcorp CDDVDW SH-S202J"    , "SB01"        },
 678         { "TSSTcorp CDDVDW SH-S202N"    , "SB00"        },
 679         { "TSSTcorp CDDVDW SH-S202N"    , "SB01"        },
 680         { "TSSTcorp CDDVDW SH-S202H"    , "SB00"        },
 681         { "TSSTcorp CDDVDW SH-S202H"    , "SB01"        },
 682         { NULL                          , NULL          }
 683 };
 684
 685 /*
 686  *  All hosts that use the 80c ribbon must use!
 687  *  The name is derived from upper byte of word 93 and the 80c ribbon.
 688  */
 689 u8 eighty_ninty_three (ide_drive_t *drive)
 690 {
 691         ide_hwif_t *hwif = drive->hwif;
 692         struct hd_driveid *id = drive->id;
 693         int ivb = ide_in_drive_list(id, ivb_list);
 694
 695         if (hwif->cbl == ATA_CBL_PATA40_SHORT)
 696                 return 1;
 697
 698         if (ivb)
 699                 printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
 700                                   drive->name);
 701
 702         if (ide_dev_is_sata(id) && !ivb)
 703                 return 1;
 704
 705         if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
 706                 goto no_80w;
 707
 708         /*
 709          * FIXME:
 710          * - change master/slave IDENTIFY order
 711          * - force bit13 (80c cable present) check also for !ivb devices
 712          *   (unless the slave device is pre-ATA3)
 713          */
 714         if ((id->hw_config & 0x4000) || (ivb && (id->hw_config & 0x2000)))
 715                 return 1;
 716
 717 no_80w:
 718         if (drive->udma33_warned == 1)
 719                 return 0;
 720
 721         printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
 722                             "limiting max speed to UDMA33\n",
 723                             drive->name,
 724                             hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
 725
 726         drive->udma33_warned = 1;
 727
 728         return 0;
 729 }
 730
 731 int ide_driveid_update(ide_drive_t *drive)
 732 {
 733         ide_hwif_t *hwif = drive->hwif;
 734         struct hd_driveid *id;
 735         unsigned long timeout, flags;
 736         u8 stat;
 737
 738         /*
 739          * Re-read drive->id for possible DMA mode
 740          * change (copied from ide-probe.c)
 741          */
 742
 743         SELECT_MASK(drive, 1);
 744         hwif->set_irq(hwif, 0);
 745         msleep(50);
 746         hwif->exec_command(hwif, WIN_IDENTIFY);
 747         timeout = jiffies + WAIT_WORSTCASE;
 748         do {
 749                 if (time_after(jiffies, timeout)) {
 750                         SELECT_MASK(drive, 0);
 751                         return 0;       /* drive timed-out */
 752                 }
 753
 754                 msleep(50);     /* give drive a breather */
 755                 stat = hwif->read_altstatus(hwif);
 756         } while (stat & BUSY_STAT);
 757
 758         msleep(50);     /* wait for IRQ and DRQ_STAT */
 759         stat = hwif->read_status(hwif);
 760
 761         if (!OK_STAT(stat, DRQ_STAT, BAD_R_STAT)) {
 762                 SELECT_MASK(drive, 0);
 763                 printk("%s: CHECK for good STATUS\n", drive->name);
 764                 return 0;
 765         }
 766         local_irq_save(flags);
 767         SELECT_MASK(drive, 0);
 768         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 769         if (!id) {
 770                 local_irq_restore(flags);
 771                 return 0;
 772         }
 773         hwif->input_data(drive, NULL, id, SECTOR_SIZE);
 774         (void)hwif->read_status(hwif);  /* clear drive IRQ */
 775         local_irq_enable();
 776         local_irq_restore(flags);
 777         ide_fix_driveid(id);
 778         if (id) {
 779                 drive->id->dma_ultra = id->dma_ultra;
 780                 drive->id->dma_mword = id->dma_mword;
 781                 drive->id->dma_1word = id->dma_1word;
 782                 /* anything more ? */
 783                 kfree(id);
 784
 785                 if (drive->using_dma && ide_id_dma_bug(drive))
 786                         ide_dma_off(drive);
 787         }
 788
 789         return 1;
 790 }
 791
 792 int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 793 {
 794         ide_hwif_t *hwif = drive->hwif;
 795         struct ide_io_ports *io_ports = &hwif->io_ports;
 796         int error = 0;
 797         u8 stat;
 798
 799 #ifdef CONFIG_BLK_DEV_IDEDMA
 800         if (hwif->dma_ops)      /* check if host supports DMA */
 801                 hwif->dma_ops->dma_host_set(drive, 0);
 802 #endif
 803
 804         /* Skip setting PIO flow-control modes on pre-EIDE drives */
 805         if ((speed & 0xf8) == XFER_PIO_0 && !(drive->id->capability & 0x08))
 806                 goto skip;
 807
 808         /*
 809          * Don't use ide_wait_cmd here - it will
 810          * attempt to set_geometry and recalibrate,
 811          * but for some reason these don't work at
 812          * this point (lost interrupt).
 813          */
 814         /*
 815          * Select the drive, and issue the SETFEATURES command
 816          */
 817         disable_irq_nosync(hwif->irq);
 818
 819         /*
 820          *      FIXME: we race against the running IRQ here if
 821          *      this is called from non IRQ context. If we use
 822          *      disable_irq() we hang on the error path. Work
 823          *      is needed.
 824          */
 825
 826         udelay(1);
 827         SELECT_DRIVE(drive);
 828         SELECT_MASK(drive, 0);
 829         udelay(1);
 830         hwif->set_irq(hwif, 0);
 831         hwif->OUTB(SETFEATURES_XFER, io_ports->feature_addr);
 832         hwif->OUTB(speed, io_ports->nsect_addr);
 833         hwif->exec_command(hwif, WIN_SETFEATURES);
 834         if (drive->quirk_list == 2)
 835                 hwif->set_irq(hwif, 1);
 836
 837         error = __ide_wait_stat(drive, drive->ready_stat,
 838                                 BUSY_STAT|DRQ_STAT|ERR_STAT,
 839                                 WAIT_CMD, &stat);
 840
 841         SELECT_MASK(drive, 0);
 842
 843         enable_irq(hwif->irq);
 844
 845         if (error) {
 846                 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
 847                 return error;
 848         }
 849
 850         drive->id->dma_ultra &= ~0xFF00;
 851         drive->id->dma_mword &= ~0x0F00;
 852         drive->id->dma_1word &= ~0x0F00;
 853
 854  skip:
 855 #ifdef CONFIG_BLK_DEV_IDEDMA
 856         if ((speed >= XFER_SW_DMA_0 || (hwif->host_flags & IDE_HFLAG_VDMA)) &&
 857             drive->using_dma)
 858                 hwif->dma_ops->dma_host_set(drive, 1);
 859         else if (hwif->dma_ops) /* check if host supports DMA */
 860                 ide_dma_off_quietly(drive);
 861 #endif
 862
 863         switch(speed) {
 864                 case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
 865                 case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
 866                 case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
 867                 case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
 868                 case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
 869                 case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
 870                 case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
 871                 case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
 872                 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
 873                 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
 874                 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
 875                 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
 876                 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
 877                 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
 878                 default: break;
 879         }
 880         if (!drive->init_speed)
 881                 drive->init_speed = speed;
 882         drive->current_speed = speed;
 883         return error;
 884 }
 885
 886 /*
 887  * This should get invoked any time we exit the driver to
 888  * wait for an interrupt response from a drive.  handler() points
 889  * at the appropriate code to handle the next interrupt, and a
 890  * timer is started to prevent us from waiting forever in case
 891  * something goes wrong (see the ide_timer_expiry() handler later on).
 892  *
 893  * See also ide_execute_command
 894  */
 895 static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 896                       unsigned int timeout, ide_expiry_t *expiry)
 897 {
 898         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 899
 900         BUG_ON(hwgroup->handler);
 901         hwgroup->handler        = handler;
 902         hwgroup->expiry         = expiry;
 903         hwgroup->timer.expires  = jiffies + timeout;
 904         hwgroup->req_gen_timer  = hwgroup->req_gen;
 905         add_timer(&hwgroup->timer);
 906 }
 907
 908 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 909                       unsigned int timeout, ide_expiry_t *expiry)
 910 {
 911         unsigned long flags;
 912         spin_lock_irqsave(&ide_lock, flags);
 913         __ide_set_handler(drive, handler, timeout, expiry);
 914         spin_unlock_irqrestore(&ide_lock, flags);
 915 }
 916
 917 EXPORT_SYMBOL(ide_set_handler);
 918
 919 /**
 920  *      ide_execute_command     -       execute an IDE command
 921  *      @drive: IDE drive to issue the command against
 922  *      @command: command byte to write
 923  *      @handler: handler for next phase
 924  *      @timeout: timeout for command
 925  *      @expiry:  handler to run on timeout
 926  *
 927  *      Helper function to issue an IDE command. This handles the
 928  *      atomicity requirements, command timing and ensures that the
 929  *      handler and IRQ setup do not race. All IDE command kick off
 930  *      should go via this function or do equivalent locking.
 931  */
 932
 933 void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler,
 934                          unsigned timeout, ide_expiry_t *expiry)
 935 {
 936         unsigned long flags;
 937         ide_hwif_t *hwif = HWIF(drive);
 938
 939         spin_lock_irqsave(&ide_lock, flags);
 940         __ide_set_handler(drive, handler, timeout, expiry);
 941         hwif->exec_command(hwif, cmd);
 942         /*
 943          * Drive takes 400nS to respond, we must avoid the IRQ being
 944          * serviced before that.
 945          *
 946          * FIXME: we could skip this delay with care on non shared devices
 947          */
 948         ndelay(400);
 949         spin_unlock_irqrestore(&ide_lock, flags);
 950 }
 951 EXPORT_SYMBOL(ide_execute_command);
 952
 953 void ide_execute_pkt_cmd(ide_drive_t *drive)
 954 {
 955         ide_hwif_t *hwif = drive->hwif;
 956         unsigned long flags;
 957
 958         spin_lock_irqsave(&ide_lock, flags);
 959         hwif->exec_command(hwif, WIN_PACKETCMD);
 960         ndelay(400);
 961         spin_unlock_irqrestore(&ide_lock, flags);
 962 }
 963 EXPORT_SYMBOL_GPL(ide_execute_pkt_cmd);
 964
 965 static inline void ide_complete_drive_reset(ide_drive_t *drive, int err)
 966 {
 967         struct request *rq = drive->hwif->hwgroup->rq;
 968
 969         if (rq && blk_special_request(rq) && rq->cmd[0] == REQ_DRIVE_RESET)
 970                 ide_end_request(drive, err ? err : 1, 0);
 971 }
 972
 973 /* needed below */
 974 static ide_startstop_t do_reset1 (ide_drive_t *, int);
 975
 976 /*
 977  * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 978  * during an atapi drive reset operation. If the drive has not yet responded,
 979  * and we have not yet hit our maximum waiting time, then the timer is restarted
 980  * for another 50ms.
 981  */
 982 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
 983 {
 984         ide_hwif_t *hwif = drive->hwif;
 985         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 986         u8 stat;
 987
 988         SELECT_DRIVE(drive);
 989         udelay (10);
 990         stat = hwif->read_status(hwif);
 991
 992         if (OK_STAT(stat, 0, BUSY_STAT))
 993                 printk("%s: ATAPI reset complete\n", drive->name);
 994         else {
 995                 if (time_before(jiffies, hwgroup->poll_timeout)) {
 996                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
 997                         /* continue polling */
 998                         return ide_started;
 999                 }
1000                 /* end of polling */
1001                 hwgroup->polling = 0;
1002                 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
1003                                 drive->name, stat);
1004                 /* do it the old fashioned way */
1005                 return do_reset1(drive, 1);
1006         }
1007         /* done polling */
1008         hwgroup->polling = 0;
1009         ide_complete_drive_reset(drive, 0);
1010         return ide_stopped;
1011 }
1012
1013 /*
1014  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
1015  * during an ide reset operation. If the drives have not yet responded,
1016  * and we have not yet hit our maximum waiting time, then the timer is restarted
1017  * for another 50ms.
1018  */
1019 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
1020 {
1021         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
1022         ide_hwif_t *hwif        = HWIF(drive);
1023         const struct ide_port_ops *port_ops = hwif->port_ops;
1024         u8 tmp;
1025         int err = 0;
1026
1027         if (port_ops && port_ops->reset_poll) {
1028                 err = port_ops->reset_poll(drive);
1029                 if (err) {
1030                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
1031                                 hwif->name, drive->name);
1032                         goto out;
1033                 }
1034         }
1035
1036         tmp = hwif->read_status(hwif);
1037
1038         if (!OK_STAT(tmp, 0, BUSY_STAT)) {
1039                 if (time_before(jiffies, hwgroup->poll_timeout)) {
1040                         ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1041                         /* continue polling */
1042                         return ide_started;
1043                 }
1044                 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
1045                 drive->failures++;
1046                 err = -EIO;
1047         } else  {
1048                 printk("%s: reset: ", hwif->name);
1049                 tmp = ide_read_error(drive);
1050
1051                 if (tmp == 1) {
1052                         printk("success\n");
1053                         drive->failures = 0;
1054                 } else {
1055                         drive->failures++;
1056                         printk("master: ");
1057                         switch (tmp & 0x7f) {
1058                                 case 1: printk("passed");
1059                                         break;
1060                                 case 2: printk("formatter device error");
1061                                         break;
1062                                 case 3: printk("sector buffer error");
1063                                         break;
1064                                 case 4: printk("ECC circuitry error");
1065                                         break;
1066                                 case 5: printk("controlling MPU error");
1067                                         break;
1068                                 default:printk("error (0x%02x?)", tmp);
1069                         }
1070                         if (tmp & 0x80)
1071                                 printk("; slave: failed");
1072                         printk("\n");
1073                         err = -EIO;
1074                 }
1075         }
1076 out:
1077         hwgroup->polling = 0;   /* done polling */
1078         ide_complete_drive_reset(drive, err);
1079         return ide_stopped;
1080 }
1081
1082 static void ide_disk_pre_reset(ide_drive_t *drive)
1083 {
1084         int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;
1085
1086         drive->special.all = 0;
1087         drive->special.b.set_geometry = legacy;
1088         drive->special.b.recalibrate  = legacy;
1089         drive->mult_count = 0;
1090         if (!drive->keep_settings && !drive->using_dma)
1091                 drive->mult_req = 0;
1092         if (drive->mult_req != drive->mult_count)
1093                 drive->special.b.set_multmode = 1;
1094 }
1095
1096 static void pre_reset(ide_drive_t *drive)
1097 {
1098         const struct ide_port_ops *port_ops = drive->hwif->port_ops;
1099
1100         if (drive->media == ide_disk)
1101                 ide_disk_pre_reset(drive);
1102         else
1103                 drive->post_reset = 1;
1104
1105         if (drive->using_dma) {
1106                 if (drive->crc_count)
1107                         ide_check_dma_crc(drive);
1108                 else
1109                         ide_dma_off(drive);
1110         }
1111
1112         if (!drive->keep_settings) {
1113                 if (!drive->using_dma) {
1114                         drive->unmask = 0;
1115                         drive->io_32bit = 0;
1116                 }
1117                 return;
1118         }
1119
1120         if (port_ops && port_ops->pre_reset)
1121                 port_ops->pre_reset(drive);
1122
1123         if (drive->current_speed != 0xff)
1124                 drive->desired_speed = drive->current_speed;
1125         drive->current_speed = 0xff;
1126 }
1127
1128 /*
1129  * do_reset1() attempts to recover a confused drive by resetting it.
1130  * Unfortunately, resetting a disk drive actually resets all devices on
1131  * the same interface, so it can really be thought of as resetting the
1132  * interface rather than resetting the drive.
1133  *
1134  * ATAPI devices have their own reset mechanism which allows them to be
1135  * individually reset without clobbering other devices on the same interface.
1136  *
1137  * Unfortunately, the IDE interface does not generate an interrupt to let
1138  * us know when the reset operation has finished, so we must poll for this.
1139  * Equally poor, though, is the fact that this may a very long time to complete,
1140  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
1141  * we set a timer to poll at 50ms intervals.
1142  */
1143 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
1144 {
1145         unsigned int unit;
1146         unsigned long flags;
1147         ide_hwif_t *hwif;
1148         ide_hwgroup_t *hwgroup;
1149         struct ide_io_ports *io_ports;
1150         const struct ide_port_ops *port_ops;
1151
1152         spin_lock_irqsave(&ide_lock, flags);
1153         hwif = HWIF(drive);
1154         hwgroup = HWGROUP(drive);
1155
1156         io_ports = &hwif->io_ports;
1157
1158         /* We must not reset with running handlers */
1159         BUG_ON(hwgroup->handler != NULL);
1160
1161         /* For an ATAPI device, first try an ATAPI SRST. */
1162         if (drive->media != ide_disk && !do_not_try_atapi) {
1163                 pre_reset(drive);
1164                 SELECT_DRIVE(drive);
1165                 udelay (20);
1166                 hwif->exec_command(hwif, WIN_SRST);
1167                 ndelay(400);
1168                 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1169                 hwgroup->polling = 1;
1170                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1171                 spin_unlock_irqrestore(&ide_lock, flags);
1172                 return ide_started;
1173         }
1174
1175         /*
1176          * First, reset any device state data we were maintaining
1177          * for any of the drives on this interface.
1178          */
1179         for (unit = 0; unit < MAX_DRIVES; ++unit)
1180                 pre_reset(&hwif->drives[unit]);
1181
1182         if (io_ports->ctl_addr == 0) {
1183                 spin_unlock_irqrestore(&ide_lock, flags);
1184                 ide_complete_drive_reset(drive, -ENXIO);
1185                 return ide_stopped;
1186         }
1187
1188         /*
1189          * Note that we also set nIEN while resetting the device,
1190          * to mask unwanted interrupts from the interface during the reset.
1191          * However, due to the design of PC hardware, this will cause an
1192          * immediate interrupt due to the edge transition it produces.
1193          * This single interrupt gives us a "fast poll" for drives that
1194          * recover from reset very quickly, saving us the first 50ms wait time.
1195          *
1196          * TODO: add ->softreset method and stop abusing ->set_irq
1197          */
1198         /* set SRST and nIEN */
1199         hwif->set_irq(hwif, 4);
1200         /* more than enough time */
1201         udelay(10);
1202         /* clear SRST, leave nIEN (unless device is on the quirk list) */
1203         hwif->set_irq(hwif, drive->quirk_list == 2);
1204         /* more than enough time */
1205         udelay(10);
1206         hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1207         hwgroup->polling = 1;
1208         __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1209
1210         /*
1211          * Some weird controller like resetting themselves to a strange
1212          * state when the disks are reset this way. At least, the Winbond
1213          * 553 documentation says that
1214          */
1215         port_ops = hwif->port_ops;
1216         if (port_ops && port_ops->resetproc)
1217                 port_ops->resetproc(drive);
1218
1219         spin_unlock_irqrestore(&ide_lock, flags);
1220         return ide_started;
1221 }
1222
1223 /*
1224  * ide_do_reset() is the entry point to the drive/interface reset code.
1225  */
1226
1227 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1228 {
1229         return do_reset1(drive, 0);
1230 }
1231
1232 EXPORT_SYMBOL(ide_do_reset);
1233
1234 /*
1235  * ide_wait_not_busy() waits for the currently selected device on the hwif
1236  * to report a non-busy status, see comments in ide_probe_port().
1237  */
1238 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1239 {
1240         u8 stat = 0;
1241
1242         while(timeout--) {
1243                 /*
1244                  * Turn this into a schedule() sleep once I'm sure
1245                  * about locking issues (2.5 work ?).
1246                  */
1247                 mdelay(1);
1248                 stat = hwif->read_status(hwif);
1249                 if ((stat & BUSY_STAT) == 0)
1250                         return 0;
1251                 /*
1252                  * Assume a value of 0xff means nothing is connected to
1253                  * the interface and it doesn't implement the pull-down
1254                  * resistor on D7.
1255                  */
1256                 if (stat == 0xff)
1257                         return -ENODEV;
1258                 touch_softlockup_watchdog();
1259                 touch_nmi_watchdog();
1260         }
1261         return -EBUSY;
1262 }
1263
1264 EXPORT_SYMBOL_GPL(ide_wait_not_busy);
1265