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         ide_task_t task;
  92
  93         if (port_ops && port_ops->selectproc)
  94                 port_ops->selectproc(drive);
  95
  96         memset(&task, 0, sizeof(task));
  97         task.tf_flags = IDE_TFLAG_OUT_DEVICE;
  98
  99         drive->hwif->tf_load(drive, &task);
 100 }
 101
 102 void SELECT_MASK(ide_drive_t *drive, int mask)
 103 {
 104         const struct ide_port_ops *port_ops = drive->hwif->port_ops;
 105
 106         if (port_ops && port_ops->maskproc)
 107                 port_ops->maskproc(drive, mask);
 108 }
 109
 110 static void ide_exec_command(ide_hwif_t *hwif, u8 cmd)
 111 {
 112         if (hwif->host_flags & IDE_HFLAG_MMIO)
 113                 writeb(cmd, (void __iomem *)hwif->io_ports.command_addr);
 114         else
 115                 outb(cmd, hwif->io_ports.command_addr);
 116 }
 117
 118 static u8 ide_read_status(ide_hwif_t *hwif)
 119 {
 120         if (hwif->host_flags & IDE_HFLAG_MMIO)
 121                 return readb((void __iomem *)hwif->io_ports.status_addr);
 122         else
 123                 return inb(hwif->io_ports.status_addr);
 124 }
 125
 126 static u8 ide_read_altstatus(ide_hwif_t *hwif)
 127 {
 128         if (hwif->host_flags & IDE_HFLAG_MMIO)
 129                 return readb((void __iomem *)hwif->io_ports.ctl_addr);
 130         else
 131                 return inb(hwif->io_ports.ctl_addr);
 132 }
 133
 134 static u8 ide_read_sff_dma_status(ide_hwif_t *hwif)
 135 {
 136         if (hwif->host_flags & IDE_HFLAG_MMIO)
 137                 return readb((void __iomem *)(hwif->dma_base + ATA_DMA_STATUS));
 138         else
 139                 return inb(hwif->dma_base + ATA_DMA_STATUS);
 140 }
 141
 142 static void ide_set_irq(ide_hwif_t *hwif, int on)
 143 {
 144         u8 ctl = ATA_DEVCTL_OBS;
 145
 146         if (on == 4) { /* hack for SRST */
 147                 ctl |= 4;
 148                 on &= ~4;
 149         }
 150
 151         ctl |= on ? 0 : 2;
 152
 153         if (hwif->host_flags & IDE_HFLAG_MMIO)
 154                 writeb(ctl, (void __iomem *)hwif->io_ports.ctl_addr);
 155         else
 156                 outb(ctl, hwif->io_ports.ctl_addr);
 157 }
 158
 159 static void ide_tf_load(ide_drive_t *drive, ide_task_t *task)
 160 {
 161         ide_hwif_t *hwif = drive->hwif;
 162         struct ide_io_ports *io_ports = &hwif->io_ports;
 163         struct ide_taskfile *tf = &task->tf;
 164         void (*tf_outb)(u8 addr, unsigned long port);
 165         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 166         u8 HIHI = (task->tf_flags & IDE_TFLAG_LBA48) ? 0xE0 : 0xEF;
 167
 168         if (mmio)
 169                 tf_outb = ide_mm_outb;
 170         else
 171                 tf_outb = ide_outb;
 172
 173         if (task->tf_flags & IDE_TFLAG_FLAGGED)
 174                 HIHI = 0xFF;
 175
 176         if (task->tf_flags & IDE_TFLAG_OUT_DATA) {
 177                 u16 data = (tf->hob_data << 8) | tf->data;
 178
 179                 if (mmio)
 180                         writew(data, (void __iomem *)io_ports->data_addr);
 181                 else
 182                         outw(data, io_ports->data_addr);
 183         }
 184
 185         if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
 186                 tf_outb(tf->hob_feature, io_ports->feature_addr);
 187         if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
 188                 tf_outb(tf->hob_nsect, io_ports->nsect_addr);
 189         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
 190                 tf_outb(tf->hob_lbal, io_ports->lbal_addr);
 191         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
 192                 tf_outb(tf->hob_lbam, io_ports->lbam_addr);
 193         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
 194                 tf_outb(tf->hob_lbah, io_ports->lbah_addr);
 195
 196         if (task->tf_flags & IDE_TFLAG_OUT_FEATURE)
 197                 tf_outb(tf->feature, io_ports->feature_addr);
 198         if (task->tf_flags & IDE_TFLAG_OUT_NSECT)
 199                 tf_outb(tf->nsect, io_ports->nsect_addr);
 200         if (task->tf_flags & IDE_TFLAG_OUT_LBAL)
 201                 tf_outb(tf->lbal, io_ports->lbal_addr);
 202         if (task->tf_flags & IDE_TFLAG_OUT_LBAM)
 203                 tf_outb(tf->lbam, io_ports->lbam_addr);
 204         if (task->tf_flags & IDE_TFLAG_OUT_LBAH)
 205                 tf_outb(tf->lbah, io_ports->lbah_addr);
 206
 207         if (task->tf_flags & IDE_TFLAG_OUT_DEVICE)
 208                 tf_outb((tf->device & HIHI) | drive->select.all,
 209                          io_ports->device_addr);
 210 }
 211
 212 static void ide_tf_read(ide_drive_t *drive, ide_task_t *task)
 213 {
 214         ide_hwif_t *hwif = drive->hwif;
 215         struct ide_io_ports *io_ports = &hwif->io_ports;
 216         struct ide_taskfile *tf = &task->tf;
 217         void (*tf_outb)(u8 addr, unsigned long port);
 218         u8 (*tf_inb)(unsigned long port);
 219         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 220
 221         if (mmio) {
 222                 tf_outb = ide_mm_outb;
 223                 tf_inb  = ide_mm_inb;
 224         } else {
 225                 tf_outb = ide_outb;
 226                 tf_inb  = ide_inb;
 227         }
 228
 229         if (task->tf_flags & IDE_TFLAG_IN_DATA) {
 230                 u16 data;
 231
 232                 if (mmio)
 233                         data = readw((void __iomem *)io_ports->data_addr);
 234                 else
 235                         data = inw(io_ports->data_addr);
 236
 237                 tf->data = data & 0xff;
 238                 tf->hob_data = (data >> 8) & 0xff;
 239         }
 240
 241         /* be sure we're looking at the low order bits */
 242         tf_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
 243
 244         if (task->tf_flags & IDE_TFLAG_IN_NSECT)
 245                 tf->nsect  = tf_inb(io_ports->nsect_addr);
 246         if (task->tf_flags & IDE_TFLAG_IN_LBAL)
 247                 tf->lbal   = tf_inb(io_ports->lbal_addr);
 248         if (task->tf_flags & IDE_TFLAG_IN_LBAM)
 249                 tf->lbam   = tf_inb(io_ports->lbam_addr);
 250         if (task->tf_flags & IDE_TFLAG_IN_LBAH)
 251                 tf->lbah   = tf_inb(io_ports->lbah_addr);
 252         if (task->tf_flags & IDE_TFLAG_IN_DEVICE)
 253                 tf->device = tf_inb(io_ports->device_addr);
 254
 255         if (task->tf_flags & IDE_TFLAG_LBA48) {
 256                 tf_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
 257
 258                 if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
 259                         tf->hob_feature = tf_inb(io_ports->feature_addr);
 260                 if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
 261                         tf->hob_nsect   = tf_inb(io_ports->nsect_addr);
 262                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
 263                         tf->hob_lbal    = tf_inb(io_ports->lbal_addr);
 264                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
 265                         tf->hob_lbam    = tf_inb(io_ports->lbam_addr);
 266                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
 267                         tf->hob_lbah    = tf_inb(io_ports->lbah_addr);
 268         }
 269 }
 270
 271 /*
 272  * Some localbus EIDE interfaces require a special access sequence
 273  * when using 32-bit I/O instructions to transfer data.  We call this
 274  * the "vlb_sync" sequence, which consists of three successive reads
 275  * of the sector count register location, with interrupts disabled
 276  * to ensure that the reads all happen together.
 277  */
 278 static void ata_vlb_sync(unsigned long port)
 279 {
 280         (void)inb(port);
 281         (void)inb(port);
 282         (void)inb(port);
 283 }
 284
 285 /*
 286  * This is used for most PIO data transfers *from* the IDE interface
 287  *
 288  * These routines will round up any request for an odd number of bytes,
 289  * so if an odd len is specified, be sure that there's at least one
 290  * extra byte allocated for the buffer.
 291  */
 292 static void ata_input_data(ide_drive_t *drive, struct request *rq,
 293                            void *buf, unsigned int len)
 294 {
 295         ide_hwif_t *hwif = drive->hwif;
 296         struct ide_io_ports *io_ports = &hwif->io_ports;
 297         unsigned long data_addr = io_ports->data_addr;
 298         u8 io_32bit = drive->io_32bit;
 299         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 300
 301         len++;
 302
 303         if (io_32bit) {
 304                 unsigned long uninitialized_var(flags);
 305
 306                 if ((io_32bit & 2) && !mmio) {
 307                         local_irq_save(flags);
 308                         ata_vlb_sync(io_ports->nsect_addr);
 309                 }
 310
 311                 if (mmio)
 312                         __ide_mm_insl((void __iomem *)data_addr, buf, len / 4);
 313                 else
 314                         insl(data_addr, buf, len / 4);
 315
 316                 if ((io_32bit & 2) && !mmio)
 317                         local_irq_restore(flags);
 318
 319                 if ((len & 3) >= 2) {
 320                         if (mmio)
 321                                 __ide_mm_insw((void __iomem *)data_addr,
 322                                                 (u8 *)buf + (len & ~3), 1);
 323                         else
 324                                 insw(data_addr, (u8 *)buf + (len & ~3), 1);
 325                 }
 326         } else {
 327                 if (mmio)
 328                         __ide_mm_insw((void __iomem *)data_addr, buf, len / 2);
 329                 else
 330                         insw(data_addr, buf, len / 2);
 331         }
 332 }
 333
 334 /*
 335  * This is used for most PIO data transfers *to* the IDE interface
 336  */
 337 static void ata_output_data(ide_drive_t *drive, struct request *rq,
 338                             void *buf, unsigned int len)
 339 {
 340         ide_hwif_t *hwif = drive->hwif;
 341         struct ide_io_ports *io_ports = &hwif->io_ports;
 342         unsigned long data_addr = io_ports->data_addr;
 343         u8 io_32bit = drive->io_32bit;
 344         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 345
 346         if (io_32bit) {
 347                 unsigned long uninitialized_var(flags);
 348
 349                 if ((io_32bit & 2) && !mmio) {
 350                         local_irq_save(flags);
 351                         ata_vlb_sync(io_ports->nsect_addr);
 352                 }
 353
 354                 if (mmio)
 355                         __ide_mm_outsl((void __iomem *)data_addr, buf, len / 4);
 356                 else
 357                         outsl(data_addr, buf, len / 4);
 358
 359                 if ((io_32bit & 2) && !mmio)
 360                         local_irq_restore(flags);
 361
 362                 if ((len & 3) >= 2) {
 363                         if (mmio)
 364                                 __ide_mm_outsw((void __iomem *)data_addr,
 365                                                  (u8 *)buf + (len & ~3), 1);
 366                         else
 367                                 outsw(data_addr, (u8 *)buf + (len & ~3), 1);
 368                 }
 369         } else {
 370                 if (mmio)
 371                         __ide_mm_outsw((void __iomem *)data_addr, buf, len / 2);
 372                 else
 373                         outsw(data_addr, buf, len / 2);
 374         }
 375 }
 376
 377 void default_hwif_transport(ide_hwif_t *hwif)
 378 {
 379         hwif->exec_command        = ide_exec_command;
 380         hwif->read_status         = ide_read_status;
 381         hwif->read_altstatus      = ide_read_altstatus;
 382         hwif->read_sff_dma_status = ide_read_sff_dma_status;
 383
 384         hwif->set_irq     = ide_set_irq;
 385
 386         hwif->tf_load     = ide_tf_load;
 387         hwif->tf_read     = ide_tf_read;
 388
 389         hwif->input_data  = ata_input_data;
 390         hwif->output_data = ata_output_data;
 391 }
 392
 393 void ide_fix_driveid (struct hd_driveid *id)
 394 {
 395 #ifndef __LITTLE_ENDIAN
 396 # ifdef __BIG_ENDIAN
 397         int i;
 398         u16 *stringcast;
 399
 400         id->config         = __le16_to_cpu(id->config);
 401         id->cyls           = __le16_to_cpu(id->cyls);
 402         id->reserved2      = __le16_to_cpu(id->reserved2);
 403         id->heads          = __le16_to_cpu(id->heads);
 404         id->track_bytes    = __le16_to_cpu(id->track_bytes);
 405         id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
 406         id->sectors        = __le16_to_cpu(id->sectors);
 407         id->vendor0        = __le16_to_cpu(id->vendor0);
 408         id->vendor1        = __le16_to_cpu(id->vendor1);
 409         id->vendor2        = __le16_to_cpu(id->vendor2);
 410         stringcast = (u16 *)&id->serial_no[0];
 411         for (i = 0; i < (20/2); i++)
 412                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 413         id->buf_type       = __le16_to_cpu(id->buf_type);
 414         id->buf_size       = __le16_to_cpu(id->buf_size);
 415         id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
 416         stringcast = (u16 *)&id->fw_rev[0];
 417         for (i = 0; i < (8/2); i++)
 418                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 419         stringcast = (u16 *)&id->model[0];
 420         for (i = 0; i < (40/2); i++)
 421                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 422         id->dword_io       = __le16_to_cpu(id->dword_io);
 423         id->reserved50     = __le16_to_cpu(id->reserved50);
 424         id->field_valid    = __le16_to_cpu(id->field_valid);
 425         id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
 426         id->cur_heads      = __le16_to_cpu(id->cur_heads);
 427         id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
 428         id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
 429         id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
 430         id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
 431         id->dma_1word      = __le16_to_cpu(id->dma_1word);
 432         id->dma_mword      = __le16_to_cpu(id->dma_mword);
 433         id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
 434         id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
 435         id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
 436         id->eide_pio       = __le16_to_cpu(id->eide_pio);
 437         id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
 438         for (i = 0; i < 2; ++i)
 439                 id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
 440         for (i = 0; i < 4; ++i)
 441                 id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
 442         id->queue_depth    = __le16_to_cpu(id->queue_depth);
 443         for (i = 0; i < 4; ++i)
 444                 id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
 445         id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
 446         id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
 447         id->command_set_1  = __le16_to_cpu(id->command_set_1);
 448         id->command_set_2  = __le16_to_cpu(id->command_set_2);
 449         id->cfsse          = __le16_to_cpu(id->cfsse);
 450         id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
 451         id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
 452         id->csf_default    = __le16_to_cpu(id->csf_default);
 453         id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
 454         id->trseuc         = __le16_to_cpu(id->trseuc);
 455         id->trsEuc         = __le16_to_cpu(id->trsEuc);
 456         id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
 457         id->mprc           = __le16_to_cpu(id->mprc);
 458         id->hw_config      = __le16_to_cpu(id->hw_config);
 459         id->acoustic       = __le16_to_cpu(id->acoustic);
 460         id->msrqs          = __le16_to_cpu(id->msrqs);
 461         id->sxfert         = __le16_to_cpu(id->sxfert);
 462         id->sal            = __le16_to_cpu(id->sal);
 463         id->spg            = __le32_to_cpu(id->spg);
 464         id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
 465         for (i = 0; i < 22; i++)
 466                 id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
 467         id->last_lun       = __le16_to_cpu(id->last_lun);
 468         id->word127        = __le16_to_cpu(id->word127);
 469         id->dlf            = __le16_to_cpu(id->dlf);
 470         id->csfo           = __le16_to_cpu(id->csfo);
 471         for (i = 0; i < 26; i++)
 472                 id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
 473         id->word156        = __le16_to_cpu(id->word156);
 474         for (i = 0; i < 3; i++)
 475                 id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
 476         id->cfa_power      = __le16_to_cpu(id->cfa_power);
 477         for (i = 0; i < 14; i++)
 478                 id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
 479         for (i = 0; i < 31; i++)
 480                 id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
 481         for (i = 0; i < 48; i++)
 482                 id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
 483         id->integrity_word  = __le16_to_cpu(id->integrity_word);
 484 # else
 485 #  error "Please fix <asm/byteorder.h>"
 486 # endif
 487 #endif
 488 }
 489
 490 /*
 491  * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
 492  * removing leading/trailing blanks and compressing internal blanks.
 493  * It is primarily used to tidy up the model name/number fields as
 494  * returned by the WIN_[P]IDENTIFY commands.
 495  */
 496
 497 void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
 498 {
 499         u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
 500
 501         if (byteswap) {
 502                 /* convert from big-endian to host byte order */
 503                 for (p = end ; p != s;) {
 504                         unsigned short *pp = (unsigned short *) (p -= 2);
 505                         *pp = ntohs(*pp);
 506                 }
 507         }
 508         /* strip leading blanks */
 509         while (s != end && *s == ' ')
 510                 ++s;
 511         /* compress internal blanks and strip trailing blanks */
 512         while (s != end && *s) {
 513                 if (*s++ != ' ' || (s != end && *s && *s != ' '))
 514                         *p++ = *(s-1);
 515         }
 516         /* wipe out trailing garbage */
 517         while (p != end)
 518                 *p++ = '\0';
 519 }
 520
 521 EXPORT_SYMBOL(ide_fixstring);
 522
 523 /*
 524  * Needed for PCI irq sharing
 525  */
 526 int drive_is_ready (ide_drive_t *drive)
 527 {
 528         ide_hwif_t *hwif        = HWIF(drive);
 529         u8 stat                 = 0;
 530
 531         if (drive->waiting_for_dma)
 532                 return hwif->dma_ops->dma_test_irq(drive);
 533
 534 #if 0
 535         /* need to guarantee 400ns since last command was issued */
 536         udelay(1);
 537 #endif
 538
 539         /*
 540          * We do a passive status test under shared PCI interrupts on
 541          * cards that truly share the ATA side interrupt, but may also share
 542          * an interrupt with another pci card/device.  We make no assumptions
 543          * about possible isa-pnp and pci-pnp issues yet.
 544          */
 545         if (hwif->io_ports.ctl_addr)
 546                 stat = hwif->read_altstatus(hwif);
 547         else
 548                 /* Note: this may clear a pending IRQ!! */
 549                 stat = hwif->read_status(hwif);
 550
 551         if (stat & BUSY_STAT)
 552                 /* drive busy:  definitely not interrupting */
 553                 return 0;
 554
 555         /* drive ready: *might* be interrupting */
 556         return 1;
 557 }
 558
 559 EXPORT_SYMBOL(drive_is_ready);
 560
 561 /*
 562  * This routine busy-waits for the drive status to be not "busy".
 563  * It then checks the status for all of the "good" bits and none
 564  * of the "bad" bits, and if all is okay it returns 0.  All other
 565  * cases return error -- caller may then invoke ide_error().
 566  *
 567  * This routine should get fixed to not hog the cpu during extra long waits..
 568  * That could be done by busy-waiting for the first jiffy or two, and then
 569  * setting a timer to wake up at half second intervals thereafter,
 570  * until timeout is achieved, before timing out.
 571  */
 572 static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout, u8 *rstat)
 573 {
 574         ide_hwif_t *hwif = drive->hwif;
 575         unsigned long flags;
 576         int i;
 577         u8 stat;
 578
 579         udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
 580         stat = hwif->read_status(hwif);
 581
 582         if (stat & BUSY_STAT) {
 583                 local_irq_set(flags);
 584                 timeout += jiffies;
 585                 while ((stat = hwif->read_status(hwif)) & BUSY_STAT) {
 586                         if (time_after(jiffies, timeout)) {
 587                                 /*
 588                                  * One last read after the timeout in case
 589                                  * heavy interrupt load made us not make any
 590                                  * progress during the timeout..
 591                                  */
 592                                 stat = hwif->read_status(hwif);
 593                                 if (!(stat & BUSY_STAT))
 594                                         break;
 595
 596                                 local_irq_restore(flags);
 597                                 *rstat = stat;
 598                                 return -EBUSY;
 599                         }
 600                 }
 601                 local_irq_restore(flags);
 602         }
 603         /*
 604          * Allow status to settle, then read it again.
 605          * A few rare drives vastly violate the 400ns spec here,
 606          * so we'll wait up to 10usec for a "good" status
 607          * rather than expensively fail things immediately.
 608          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 609          */
 610         for (i = 0; i < 10; i++) {
 611                 udelay(1);
 612                 stat = hwif->read_status(hwif);
 613
 614                 if (OK_STAT(stat, good, bad)) {
 615                         *rstat = stat;
 616                         return 0;
 617                 }
 618         }
 619         *rstat = stat;
 620         return -EFAULT;
 621 }
 622
 623 /*
 624  * In case of error returns error value after doing "*startstop = ide_error()".
 625  * The caller should return the updated value of "startstop" in this case,
 626  * "startstop" is unchanged when the function returns 0.
 627  */
 628 int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
 629 {
 630         int err;
 631         u8 stat;
 632
 633         /* bail early if we've exceeded max_failures */
 634         if (drive->max_failures && (drive->failures > drive->max_failures)) {
 635                 *startstop = ide_stopped;
 636                 return 1;
 637         }
 638
 639         err = __ide_wait_stat(drive, good, bad, timeout, &stat);
 640
 641         if (err) {
 642                 char *s = (err == -EBUSY) ? "status timeout" : "status error";
 643                 *startstop = ide_error(drive, s, stat);
 644         }
 645
 646         return err;
 647 }
 648
 649 EXPORT_SYMBOL(ide_wait_stat);
 650
 651 /**
 652  *      ide_in_drive_list       -       look for drive in black/white list
 653  *      @id: drive identifier
 654  *      @drive_table: list to inspect
 655  *
 656  *      Look for a drive in the blacklist and the whitelist tables
 657  *      Returns 1 if the drive is found in the table.
 658  */
 659
 660 int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
 661 {
 662         for ( ; drive_table->id_model; drive_table++)
 663                 if ((!strcmp(drive_table->id_model, id->model)) &&
 664                     (!drive_table->id_firmware ||
 665                      strstr(id->fw_rev, drive_table->id_firmware)))
 666                         return 1;
 667         return 0;
 668 }
 669
 670 EXPORT_SYMBOL_GPL(ide_in_drive_list);
 671
 672 /*
 673  * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
 674  * We list them here and depend on the device side cable detection for them.
 675  *
 676  * Some optical devices with the buggy firmwares have the same problem.
 677  */
 678 static const struct drive_list_entry ivb_list[] = {
 679         { "QUANTUM FIREBALLlct10 05"    , "A03.0900"    },
 680         { "TSSTcorp CDDVDW SH-S202J"    , "SB00"        },
 681         { "TSSTcorp CDDVDW SH-S202J"    , "SB01"        },
 682         { "TSSTcorp CDDVDW SH-S202N"    , "SB00"        },
 683         { "TSSTcorp CDDVDW SH-S202N"    , "SB01"        },
 684         { "TSSTcorp CDDVDW SH-S202H"    , "SB00"        },
 685         { "TSSTcorp CDDVDW SH-S202H"    , "SB01"        },
 686         { NULL                          , NULL          }
 687 };
 688
 689 /*
 690  *  All hosts that use the 80c ribbon must use!
 691  *  The name is derived from upper byte of word 93 and the 80c ribbon.
 692  */
 693 u8 eighty_ninty_three (ide_drive_t *drive)
 694 {
 695         ide_hwif_t *hwif = drive->hwif;
 696         struct hd_driveid *id = drive->id;
 697         int ivb = ide_in_drive_list(id, ivb_list);
 698
 699         if (hwif->cbl == ATA_CBL_PATA40_SHORT)
 700                 return 1;
 701
 702         if (ivb)
 703                 printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
 704                                   drive->name);
 705
 706         if (ide_dev_is_sata(id) && !ivb)
 707                 return 1;
 708
 709         if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
 710                 goto no_80w;
 711
 712         /*
 713          * FIXME:
 714          * - change master/slave IDENTIFY order
 715          * - force bit13 (80c cable present) check also for !ivb devices
 716          *   (unless the slave device is pre-ATA3)
 717          */
 718         if ((id->hw_config & 0x4000) || (ivb && (id->hw_config & 0x2000)))
 719                 return 1;
 720
 721 no_80w:
 722         if (drive->udma33_warned == 1)
 723                 return 0;
 724
 725         printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
 726                             "limiting max speed to UDMA33\n",
 727                             drive->name,
 728                             hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
 729
 730         drive->udma33_warned = 1;
 731
 732         return 0;
 733 }
 734
 735 int ide_driveid_update(ide_drive_t *drive)
 736 {
 737         ide_hwif_t *hwif = drive->hwif;
 738         struct hd_driveid *id;
 739         unsigned long timeout, flags;
 740         u8 stat;
 741
 742         /*
 743          * Re-read drive->id for possible DMA mode
 744          * change (copied from ide-probe.c)
 745          */
 746
 747         SELECT_MASK(drive, 1);
 748         hwif->set_irq(hwif, 0);
 749         msleep(50);
 750         hwif->exec_command(hwif, WIN_IDENTIFY);
 751         timeout = jiffies + WAIT_WORSTCASE;
 752         do {
 753                 if (time_after(jiffies, timeout)) {
 754                         SELECT_MASK(drive, 0);
 755                         return 0;       /* drive timed-out */
 756                 }
 757
 758                 msleep(50);     /* give drive a breather */
 759                 stat = hwif->read_altstatus(hwif);
 760         } while (stat & BUSY_STAT);
 761
 762         msleep(50);     /* wait for IRQ and DRQ_STAT */
 763         stat = hwif->read_status(hwif);
 764
 765         if (!OK_STAT(stat, DRQ_STAT, BAD_R_STAT)) {
 766                 SELECT_MASK(drive, 0);
 767                 printk("%s: CHECK for good STATUS\n", drive->name);
 768                 return 0;
 769         }
 770         local_irq_save(flags);
 771         SELECT_MASK(drive, 0);
 772         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 773         if (!id) {
 774                 local_irq_restore(flags);
 775                 return 0;
 776         }
 777         hwif->input_data(drive, NULL, id, SECTOR_SIZE);
 778         (void)hwif->read_status(hwif);  /* clear drive IRQ */
 779         local_irq_enable();
 780         local_irq_restore(flags);
 781         ide_fix_driveid(id);
 782         if (id) {
 783                 drive->id->dma_ultra = id->dma_ultra;
 784                 drive->id->dma_mword = id->dma_mword;
 785                 drive->id->dma_1word = id->dma_1word;
 786                 /* anything more ? */
 787                 kfree(id);
 788
 789                 if (drive->using_dma && ide_id_dma_bug(drive))
 790                         ide_dma_off(drive);
 791         }
 792
 793         return 1;
 794 }
 795
 796 int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 797 {
 798         ide_hwif_t *hwif = drive->hwif;
 799         int error = 0;
 800         u8 stat;
 801         ide_task_t task;
 802
 803 #ifdef CONFIG_BLK_DEV_IDEDMA
 804         if (hwif->dma_ops)      /* check if host supports DMA */
 805                 hwif->dma_ops->dma_host_set(drive, 0);
 806 #endif
 807
 808         /* Skip setting PIO flow-control modes on pre-EIDE drives */
 809         if ((speed & 0xf8) == XFER_PIO_0 && !(drive->id->capability & 0x08))
 810                 goto skip;
 811
 812         /*
 813          * Don't use ide_wait_cmd here - it will
 814          * attempt to set_geometry and recalibrate,
 815          * but for some reason these don't work at
 816          * this point (lost interrupt).
 817          */
 818         /*
 819          * Select the drive, and issue the SETFEATURES command
 820          */
 821         disable_irq_nosync(hwif->irq);
 822
 823         /*
 824          *      FIXME: we race against the running IRQ here if
 825          *      this is called from non IRQ context. If we use
 826          *      disable_irq() we hang on the error path. Work
 827          *      is needed.
 828          */
 829
 830         udelay(1);
 831         SELECT_DRIVE(drive);
 832         SELECT_MASK(drive, 0);
 833         udelay(1);
 834         hwif->set_irq(hwif, 0);
 835
 836         memset(&task, 0, sizeof(task));
 837         task.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT;
 838         task.tf.feature = SETFEATURES_XFER;
 839         task.tf.nsect   = speed;
 840
 841         hwif->tf_load(drive, &task);
 842
 843         hwif->exec_command(hwif, WIN_SETFEATURES);
 844
 845         if (drive->quirk_list == 2)
 846                 hwif->set_irq(hwif, 1);
 847
 848         error = __ide_wait_stat(drive, drive->ready_stat,
 849                                 BUSY_STAT|DRQ_STAT|ERR_STAT,
 850                                 WAIT_CMD, &stat);
 851
 852         SELECT_MASK(drive, 0);
 853
 854         enable_irq(hwif->irq);
 855
 856         if (error) {
 857                 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
 858                 return error;
 859         }
 860
 861         drive->id->dma_ultra &= ~0xFF00;
 862         drive->id->dma_mword &= ~0x0F00;
 863         drive->id->dma_1word &= ~0x0F00;
 864
 865  skip:
 866 #ifdef CONFIG_BLK_DEV_IDEDMA
 867         if ((speed >= XFER_SW_DMA_0 || (hwif->host_flags & IDE_HFLAG_VDMA)) &&
 868             drive->using_dma)
 869                 hwif->dma_ops->dma_host_set(drive, 1);
 870         else if (hwif->dma_ops) /* check if host supports DMA */
 871                 ide_dma_off_quietly(drive);
 872 #endif
 873
 874         switch(speed) {
 875                 case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
 876                 case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
 877                 case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
 878                 case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
 879                 case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
 880                 case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
 881                 case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
 882                 case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
 883                 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
 884                 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
 885                 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
 886                 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
 887                 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
 888                 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
 889                 default: break;
 890         }
 891         if (!drive->init_speed)
 892                 drive->init_speed = speed;
 893         drive->current_speed = speed;
 894         return error;
 895 }
 896
 897 /*
 898  * This should get invoked any time we exit the driver to
 899  * wait for an interrupt response from a drive.  handler() points
 900  * at the appropriate code to handle the next interrupt, and a
 901  * timer is started to prevent us from waiting forever in case
 902  * something goes wrong (see the ide_timer_expiry() handler later on).
 903  *
 904  * See also ide_execute_command
 905  */
 906 static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 907                       unsigned int timeout, ide_expiry_t *expiry)
 908 {
 909         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 910
 911         BUG_ON(hwgroup->handler);
 912         hwgroup->handler        = handler;
 913         hwgroup->expiry         = expiry;
 914         hwgroup->timer.expires  = jiffies + timeout;
 915         hwgroup->req_gen_timer  = hwgroup->req_gen;
 916         add_timer(&hwgroup->timer);
 917 }
 918
 919 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 920                       unsigned int timeout, ide_expiry_t *expiry)
 921 {
 922         unsigned long flags;
 923         spin_lock_irqsave(&ide_lock, flags);
 924         __ide_set_handler(drive, handler, timeout, expiry);
 925         spin_unlock_irqrestore(&ide_lock, flags);
 926 }
 927
 928 EXPORT_SYMBOL(ide_set_handler);
 929
 930 /**
 931  *      ide_execute_command     -       execute an IDE command
 932  *      @drive: IDE drive to issue the command against
 933  *      @command: command byte to write
 934  *      @handler: handler for next phase
 935  *      @timeout: timeout for command
 936  *      @expiry:  handler to run on timeout
 937  *
 938  *      Helper function to issue an IDE command. This handles the
 939  *      atomicity requirements, command timing and ensures that the
 940  *      handler and IRQ setup do not race. All IDE command kick off
 941  *      should go via this function or do equivalent locking.
 942  */
 943
 944 void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler,
 945                          unsigned timeout, ide_expiry_t *expiry)
 946 {
 947         unsigned long flags;
 948         ide_hwif_t *hwif = HWIF(drive);
 949
 950         spin_lock_irqsave(&ide_lock, flags);
 951         __ide_set_handler(drive, handler, timeout, expiry);
 952         hwif->exec_command(hwif, cmd);
 953         /*
 954          * Drive takes 400nS to respond, we must avoid the IRQ being
 955          * serviced before that.
 956          *
 957          * FIXME: we could skip this delay with care on non shared devices
 958          */
 959         ndelay(400);
 960         spin_unlock_irqrestore(&ide_lock, flags);
 961 }
 962 EXPORT_SYMBOL(ide_execute_command);
 963
 964 void ide_execute_pkt_cmd(ide_drive_t *drive)
 965 {
 966         ide_hwif_t *hwif = drive->hwif;
 967         unsigned long flags;
 968
 969         spin_lock_irqsave(&ide_lock, flags);
 970         hwif->exec_command(hwif, WIN_PACKETCMD);
 971         ndelay(400);
 972         spin_unlock_irqrestore(&ide_lock, flags);
 973 }
 974 EXPORT_SYMBOL_GPL(ide_execute_pkt_cmd);
 975
 976 static inline void ide_complete_drive_reset(ide_drive_t *drive, int err)
 977 {
 978         struct request *rq = drive->hwif->hwgroup->rq;
 979
 980         if (rq && blk_special_request(rq) && rq->cmd[0] == REQ_DRIVE_RESET)
 981                 ide_end_request(drive, err ? err : 1, 0);
 982 }
 983
 984 /* needed below */
 985 static ide_startstop_t do_reset1 (ide_drive_t *, int);
 986
 987 /*
 988  * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 989  * during an atapi drive reset operation. If the drive has not yet responded,
 990  * and we have not yet hit our maximum waiting time, then the timer is restarted
 991  * for another 50ms.
 992  */
 993 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
 994 {
 995         ide_hwif_t *hwif = drive->hwif;
 996         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 997         u8 stat;
 998
 999         SELECT_DRIVE(drive);
1000         udelay (10);
1001         stat = hwif->read_status(hwif);
1002
1003         if (OK_STAT(stat, 0, BUSY_STAT))
1004                 printk("%s: ATAPI reset complete\n", drive->name);
1005         else {
1006                 if (time_before(jiffies, hwgroup->poll_timeout)) {
1007                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1008                         /* continue polling */
1009                         return ide_started;
1010                 }
1011                 /* end of polling */
1012                 hwgroup->polling = 0;
1013                 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
1014                                 drive->name, stat);
1015                 /* do it the old fashioned way */
1016                 return do_reset1(drive, 1);
1017         }
1018         /* done polling */
1019         hwgroup->polling = 0;
1020         ide_complete_drive_reset(drive, 0);
1021         return ide_stopped;
1022 }
1023
1024 /*
1025  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
1026  * during an ide reset operation. If the drives have not yet responded,
1027  * and we have not yet hit our maximum waiting time, then the timer is restarted
1028  * for another 50ms.
1029  */
1030 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
1031 {
1032         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
1033         ide_hwif_t *hwif        = HWIF(drive);
1034         const struct ide_port_ops *port_ops = hwif->port_ops;
1035         u8 tmp;
1036         int err = 0;
1037
1038         if (port_ops && port_ops->reset_poll) {
1039                 err = port_ops->reset_poll(drive);
1040                 if (err) {
1041                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
1042                                 hwif->name, drive->name);
1043                         goto out;
1044                 }
1045         }
1046
1047         tmp = hwif->read_status(hwif);
1048
1049         if (!OK_STAT(tmp, 0, BUSY_STAT)) {
1050                 if (time_before(jiffies, hwgroup->poll_timeout)) {
1051                         ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1052                         /* continue polling */
1053                         return ide_started;
1054                 }
1055                 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
1056                 drive->failures++;
1057                 err = -EIO;
1058         } else  {
1059                 printk("%s: reset: ", hwif->name);
1060                 tmp = ide_read_error(drive);
1061
1062                 if (tmp == 1) {
1063                         printk("success\n");
1064                         drive->failures = 0;
1065                 } else {
1066                         drive->failures++;
1067                         printk("master: ");
1068                         switch (tmp & 0x7f) {
1069                                 case 1: printk("passed");
1070                                         break;
1071                                 case 2: printk("formatter device error");
1072                                         break;
1073                                 case 3: printk("sector buffer error");
1074                                         break;
1075                                 case 4: printk("ECC circuitry error");
1076                                         break;
1077                                 case 5: printk("controlling MPU error");
1078                                         break;
1079                                 default:printk("error (0x%02x?)", tmp);
1080                         }
1081                         if (tmp & 0x80)
1082                                 printk("; slave: failed");
1083                         printk("\n");
1084                         err = -EIO;
1085                 }
1086         }
1087 out:
1088         hwgroup->polling = 0;   /* done polling */
1089         ide_complete_drive_reset(drive, err);
1090         return ide_stopped;
1091 }
1092
1093 static void ide_disk_pre_reset(ide_drive_t *drive)
1094 {
1095         int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;
1096
1097         drive->special.all = 0;
1098         drive->special.b.set_geometry = legacy;
1099         drive->special.b.recalibrate  = legacy;
1100         drive->mult_count = 0;
1101         if (!drive->keep_settings && !drive->using_dma)
1102                 drive->mult_req = 0;
1103         if (drive->mult_req != drive->mult_count)
1104                 drive->special.b.set_multmode = 1;
1105 }
1106
1107 static void pre_reset(ide_drive_t *drive)
1108 {
1109         const struct ide_port_ops *port_ops = drive->hwif->port_ops;
1110
1111         if (drive->media == ide_disk)
1112                 ide_disk_pre_reset(drive);
1113         else
1114                 drive->post_reset = 1;
1115
1116         if (drive->using_dma) {
1117                 if (drive->crc_count)
1118                         ide_check_dma_crc(drive);
1119                 else
1120                         ide_dma_off(drive);
1121         }
1122
1123         if (!drive->keep_settings) {
1124                 if (!drive->using_dma) {
1125                         drive->unmask = 0;
1126                         drive->io_32bit = 0;
1127                 }
1128                 return;
1129         }
1130
1131         if (port_ops && port_ops->pre_reset)
1132                 port_ops->pre_reset(drive);
1133
1134         if (drive->current_speed != 0xff)
1135                 drive->desired_speed = drive->current_speed;
1136         drive->current_speed = 0xff;
1137 }
1138
1139 /*
1140  * do_reset1() attempts to recover a confused drive by resetting it.
1141  * Unfortunately, resetting a disk drive actually resets all devices on
1142  * the same interface, so it can really be thought of as resetting the
1143  * interface rather than resetting the drive.
1144  *
1145  * ATAPI devices have their own reset mechanism which allows them to be
1146  * individually reset without clobbering other devices on the same interface.
1147  *
1148  * Unfortunately, the IDE interface does not generate an interrupt to let
1149  * us know when the reset operation has finished, so we must poll for this.
1150  * Equally poor, though, is the fact that this may a very long time to complete,
1151  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
1152  * we set a timer to poll at 50ms intervals.
1153  */
1154 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
1155 {
1156         unsigned int unit;
1157         unsigned long flags;
1158         ide_hwif_t *hwif;
1159         ide_hwgroup_t *hwgroup;
1160         struct ide_io_ports *io_ports;
1161         const struct ide_port_ops *port_ops;
1162
1163         spin_lock_irqsave(&ide_lock, flags);
1164         hwif = HWIF(drive);
1165         hwgroup = HWGROUP(drive);
1166
1167         io_ports = &hwif->io_ports;
1168
1169         /* We must not reset with running handlers */
1170         BUG_ON(hwgroup->handler != NULL);
1171
1172         /* For an ATAPI device, first try an ATAPI SRST. */
1173         if (drive->media != ide_disk && !do_not_try_atapi) {
1174                 pre_reset(drive);
1175                 SELECT_DRIVE(drive);
1176                 udelay (20);
1177                 hwif->exec_command(hwif, WIN_SRST);
1178                 ndelay(400);
1179                 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1180                 hwgroup->polling = 1;
1181                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1182                 spin_unlock_irqrestore(&ide_lock, flags);
1183                 return ide_started;
1184         }
1185
1186         /*
1187          * First, reset any device state data we were maintaining
1188          * for any of the drives on this interface.
1189          */
1190         for (unit = 0; unit < MAX_DRIVES; ++unit)
1191                 pre_reset(&hwif->drives[unit]);
1192
1193         if (io_ports->ctl_addr == 0) {
1194                 spin_unlock_irqrestore(&ide_lock, flags);
1195                 ide_complete_drive_reset(drive, -ENXIO);
1196                 return ide_stopped;
1197         }
1198
1199         /*
1200          * Note that we also set nIEN while resetting the device,
1201          * to mask unwanted interrupts from the interface during the reset.
1202          * However, due to the design of PC hardware, this will cause an
1203          * immediate interrupt due to the edge transition it produces.
1204          * This single interrupt gives us a "fast poll" for drives that
1205          * recover from reset very quickly, saving us the first 50ms wait time.
1206          *
1207          * TODO: add ->softreset method and stop abusing ->set_irq
1208          */
1209         /* set SRST and nIEN */
1210         hwif->set_irq(hwif, 4);
1211         /* more than enough time */
1212         udelay(10);
1213         /* clear SRST, leave nIEN (unless device is on the quirk list) */
1214         hwif->set_irq(hwif, drive->quirk_list == 2);
1215         /* more than enough time */
1216         udelay(10);
1217         hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1218         hwgroup->polling = 1;
1219         __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1220
1221         /*
1222          * Some weird controller like resetting themselves to a strange
1223          * state when the disks are reset this way. At least, the Winbond
1224          * 553 documentation says that
1225          */
1226         port_ops = hwif->port_ops;
1227         if (port_ops && port_ops->resetproc)
1228                 port_ops->resetproc(drive);
1229
1230         spin_unlock_irqrestore(&ide_lock, flags);
1231         return ide_started;
1232 }
1233
1234 /*
1235  * ide_do_reset() is the entry point to the drive/interface reset code.
1236  */
1237
1238 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1239 {
1240         return do_reset1(drive, 0);
1241 }
1242
1243 EXPORT_SYMBOL(ide_do_reset);
1244
1245 /*
1246  * ide_wait_not_busy() waits for the currently selected device on the hwif
1247  * to report a non-busy status, see comments in ide_probe_port().
1248  */
1249 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1250 {
1251         u8 stat = 0;
1252
1253         while(timeout--) {
1254                 /*
1255                  * Turn this into a schedule() sleep once I'm sure
1256                  * about locking issues (2.5 work ?).
1257                  */
1258                 mdelay(1);
1259                 stat = hwif->read_status(hwif);
1260                 if ((stat & BUSY_STAT) == 0)
1261                         return 0;
1262                 /*
1263                  * Assume a value of 0xff means nothing is connected to
1264                  * the interface and it doesn't implement the pull-down
1265                  * resistor on D7.
1266                  */
1267                 if (stat == 0xff)
1268                         return -ENODEV;
1269                 touch_softlockup_watchdog();
1270                 touch_nmi_watchdog();
1271         }
1272         return -EBUSY;
1273 }
1274
1275 EXPORT_SYMBOL_GPL(ide_wait_not_busy);
1276