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

   1 /*
   2  *  Copyright (C) 2000-2002     Andre Hedrick <andre@linux-ide.org>
   3  *  Copyright (C) 2003          Red Hat <alan@redhat.com>
   4  *
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/types.h>
   9 #include <linux/string.h>
  10 #include <linux/kernel.h>
  11 #include <linux/timer.h>
  12 #include <linux/mm.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/major.h>
  15 #include <linux/errno.h>
  16 #include <linux/genhd.h>
  17 #include <linux/blkpg.h>
  18 #include <linux/slab.h>
  19 #include <linux/pci.h>
  20 #include <linux/delay.h>
  21 #include <linux/hdreg.h>
  22 #include <linux/ide.h>
  23 #include <linux/bitops.h>
  24 #include <linux/nmi.h>
  25
  26 #include <asm/byteorder.h>
  27 #include <asm/irq.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/io.h>
  30
  31 /*
  32  *      Conventional PIO operations for ATA devices
  33  */
  34
  35 static u8 ide_inb (unsigned long port)
  36 {
  37         return (u8) inb(port);
  38 }
  39
  40 static void ide_outb (u8 val, unsigned long port)
  41 {
  42         outb(val, port);
  43 }
  44
  45 /*
  46  *      MMIO operations, typically used for SATA controllers
  47  */
  48
  49 static u8 ide_mm_inb (unsigned long port)
  50 {
  51         return (u8) readb((void __iomem *) port);
  52 }
  53
  54 static void ide_mm_outb (u8 value, unsigned long port)
  55 {
  56         writeb(value, (void __iomem *) port);
  57 }
  58
  59 void SELECT_DRIVE (ide_drive_t *drive)
  60 {
  61         ide_hwif_t *hwif = drive->hwif;
  62         const struct ide_port_ops *port_ops = hwif->port_ops;
  63         ide_task_t task;
  64
  65         if (port_ops && port_ops->selectproc)
  66                 port_ops->selectproc(drive);
  67
  68         memset(&task, 0, sizeof(task));
  69         task.tf_flags = IDE_TFLAG_OUT_DEVICE;
  70
  71         drive->hwif->tp_ops->tf_load(drive, &task);
  72 }
  73
  74 void SELECT_MASK(ide_drive_t *drive, int mask)
  75 {
  76         const struct ide_port_ops *port_ops = drive->hwif->port_ops;
  77
  78         if (port_ops && port_ops->maskproc)
  79                 port_ops->maskproc(drive, mask);
  80 }
  81
  82 void ide_exec_command(ide_hwif_t *hwif, u8 cmd)
  83 {
  84         if (hwif->host_flags & IDE_HFLAG_MMIO)
  85                 writeb(cmd, (void __iomem *)hwif->io_ports.command_addr);
  86         else
  87                 outb(cmd, hwif->io_ports.command_addr);
  88 }
  89 EXPORT_SYMBOL_GPL(ide_exec_command);
  90
  91 u8 ide_read_status(ide_hwif_t *hwif)
  92 {
  93         if (hwif->host_flags & IDE_HFLAG_MMIO)
  94                 return readb((void __iomem *)hwif->io_ports.status_addr);
  95         else
  96                 return inb(hwif->io_ports.status_addr);
  97 }
  98 EXPORT_SYMBOL_GPL(ide_read_status);
  99
 100 u8 ide_read_altstatus(ide_hwif_t *hwif)
 101 {
 102         if (hwif->host_flags & IDE_HFLAG_MMIO)
 103                 return readb((void __iomem *)hwif->io_ports.ctl_addr);
 104         else
 105                 return inb(hwif->io_ports.ctl_addr);
 106 }
 107 EXPORT_SYMBOL_GPL(ide_read_altstatus);
 108
 109 u8 ide_read_sff_dma_status(ide_hwif_t *hwif)
 110 {
 111         if (hwif->host_flags & IDE_HFLAG_MMIO)
 112                 return readb((void __iomem *)(hwif->dma_base + ATA_DMA_STATUS));
 113         else
 114                 return inb(hwif->dma_base + ATA_DMA_STATUS);
 115 }
 116 EXPORT_SYMBOL_GPL(ide_read_sff_dma_status);
 117
 118 void ide_set_irq(ide_hwif_t *hwif, int on)
 119 {
 120         u8 ctl = ATA_DEVCTL_OBS;
 121
 122         if (on == 4) { /* hack for SRST */
 123                 ctl |= 4;
 124                 on &= ~4;
 125         }
 126
 127         ctl |= on ? 0 : 2;
 128
 129         if (hwif->host_flags & IDE_HFLAG_MMIO)
 130                 writeb(ctl, (void __iomem *)hwif->io_ports.ctl_addr);
 131         else
 132                 outb(ctl, hwif->io_ports.ctl_addr);
 133 }
 134 EXPORT_SYMBOL_GPL(ide_set_irq);
 135
 136 void ide_tf_load(ide_drive_t *drive, ide_task_t *task)
 137 {
 138         ide_hwif_t *hwif = drive->hwif;
 139         struct ide_io_ports *io_ports = &hwif->io_ports;
 140         struct ide_taskfile *tf = &task->tf;
 141         void (*tf_outb)(u8 addr, unsigned long port);
 142         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 143         u8 HIHI = (task->tf_flags & IDE_TFLAG_LBA48) ? 0xE0 : 0xEF;
 144
 145         if (mmio)
 146                 tf_outb = ide_mm_outb;
 147         else
 148                 tf_outb = ide_outb;
 149
 150         if (task->tf_flags & IDE_TFLAG_FLAGGED)
 151                 HIHI = 0xFF;
 152
 153         if (task->tf_flags & IDE_TFLAG_OUT_DATA) {
 154                 u16 data = (tf->hob_data << 8) | tf->data;
 155
 156                 if (mmio)
 157                         writew(data, (void __iomem *)io_ports->data_addr);
 158                 else
 159                         outw(data, io_ports->data_addr);
 160         }
 161
 162         if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
 163                 tf_outb(tf->hob_feature, io_ports->feature_addr);
 164         if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
 165                 tf_outb(tf->hob_nsect, io_ports->nsect_addr);
 166         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
 167                 tf_outb(tf->hob_lbal, io_ports->lbal_addr);
 168         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
 169                 tf_outb(tf->hob_lbam, io_ports->lbam_addr);
 170         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
 171                 tf_outb(tf->hob_lbah, io_ports->lbah_addr);
 172
 173         if (task->tf_flags & IDE_TFLAG_OUT_FEATURE)
 174                 tf_outb(tf->feature, io_ports->feature_addr);
 175         if (task->tf_flags & IDE_TFLAG_OUT_NSECT)
 176                 tf_outb(tf->nsect, io_ports->nsect_addr);
 177         if (task->tf_flags & IDE_TFLAG_OUT_LBAL)
 178                 tf_outb(tf->lbal, io_ports->lbal_addr);
 179         if (task->tf_flags & IDE_TFLAG_OUT_LBAM)
 180                 tf_outb(tf->lbam, io_ports->lbam_addr);
 181         if (task->tf_flags & IDE_TFLAG_OUT_LBAH)
 182                 tf_outb(tf->lbah, io_ports->lbah_addr);
 183
 184         if (task->tf_flags & IDE_TFLAG_OUT_DEVICE)
 185                 tf_outb((tf->device & HIHI) | drive->select.all,
 186                          io_ports->device_addr);
 187 }
 188 EXPORT_SYMBOL_GPL(ide_tf_load);
 189
 190 void ide_tf_read(ide_drive_t *drive, ide_task_t *task)
 191 {
 192         ide_hwif_t *hwif = drive->hwif;
 193         struct ide_io_ports *io_ports = &hwif->io_ports;
 194         struct ide_taskfile *tf = &task->tf;
 195         void (*tf_outb)(u8 addr, unsigned long port);
 196         u8 (*tf_inb)(unsigned long port);
 197         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 198
 199         if (mmio) {
 200                 tf_outb = ide_mm_outb;
 201                 tf_inb  = ide_mm_inb;
 202         } else {
 203                 tf_outb = ide_outb;
 204                 tf_inb  = ide_inb;
 205         }
 206
 207         if (task->tf_flags & IDE_TFLAG_IN_DATA) {
 208                 u16 data;
 209
 210                 if (mmio)
 211                         data = readw((void __iomem *)io_ports->data_addr);
 212                 else
 213                         data = inw(io_ports->data_addr);
 214
 215                 tf->data = data & 0xff;
 216                 tf->hob_data = (data >> 8) & 0xff;
 217         }
 218
 219         /* be sure we're looking at the low order bits */
 220         tf_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
 221
 222         if (task->tf_flags & IDE_TFLAG_IN_FEATURE)
 223                 tf->feature = tf_inb(io_ports->feature_addr);
 224         if (task->tf_flags & IDE_TFLAG_IN_NSECT)
 225                 tf->nsect  = tf_inb(io_ports->nsect_addr);
 226         if (task->tf_flags & IDE_TFLAG_IN_LBAL)
 227                 tf->lbal   = tf_inb(io_ports->lbal_addr);
 228         if (task->tf_flags & IDE_TFLAG_IN_LBAM)
 229                 tf->lbam   = tf_inb(io_ports->lbam_addr);
 230         if (task->tf_flags & IDE_TFLAG_IN_LBAH)
 231                 tf->lbah   = tf_inb(io_ports->lbah_addr);
 232         if (task->tf_flags & IDE_TFLAG_IN_DEVICE)
 233                 tf->device = tf_inb(io_ports->device_addr);
 234
 235         if (task->tf_flags & IDE_TFLAG_LBA48) {
 236                 tf_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
 237
 238                 if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
 239                         tf->hob_feature = tf_inb(io_ports->feature_addr);
 240                 if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
 241                         tf->hob_nsect   = tf_inb(io_ports->nsect_addr);
 242                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
 243                         tf->hob_lbal    = tf_inb(io_ports->lbal_addr);
 244                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
 245                         tf->hob_lbam    = tf_inb(io_ports->lbam_addr);
 246                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
 247                         tf->hob_lbah    = tf_inb(io_ports->lbah_addr);
 248         }
 249 }
 250 EXPORT_SYMBOL_GPL(ide_tf_read);
 251
 252 /*
 253  * Some localbus EIDE interfaces require a special access sequence
 254  * when using 32-bit I/O instructions to transfer data.  We call this
 255  * the "vlb_sync" sequence, which consists of three successive reads
 256  * of the sector count register location, with interrupts disabled
 257  * to ensure that the reads all happen together.
 258  */
 259 static void ata_vlb_sync(unsigned long port)
 260 {
 261         (void)inb(port);
 262         (void)inb(port);
 263         (void)inb(port);
 264 }
 265
 266 /*
 267  * This is used for most PIO data transfers *from* the IDE interface
 268  *
 269  * These routines will round up any request for an odd number of bytes,
 270  * so if an odd len is specified, be sure that there's at least one
 271  * extra byte allocated for the buffer.
 272  */
 273 void ide_input_data(ide_drive_t *drive, struct request *rq, void *buf,
 274                     unsigned int len)
 275 {
 276         ide_hwif_t *hwif = drive->hwif;
 277         struct ide_io_ports *io_ports = &hwif->io_ports;
 278         unsigned long data_addr = io_ports->data_addr;
 279         u8 io_32bit = drive->io_32bit;
 280         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 281
 282         len++;
 283
 284         if (io_32bit) {
 285                 unsigned long uninitialized_var(flags);
 286
 287                 if ((io_32bit & 2) && !mmio) {
 288                         local_irq_save(flags);
 289                         ata_vlb_sync(io_ports->nsect_addr);
 290                 }
 291
 292                 if (mmio)
 293                         __ide_mm_insl((void __iomem *)data_addr, buf, len / 4);
 294                 else
 295                         insl(data_addr, buf, len / 4);
 296
 297                 if ((io_32bit & 2) && !mmio)
 298                         local_irq_restore(flags);
 299
 300                 if ((len & 3) >= 2) {
 301                         if (mmio)
 302                                 __ide_mm_insw((void __iomem *)data_addr,
 303                                                 (u8 *)buf + (len & ~3), 1);
 304                         else
 305                                 insw(data_addr, (u8 *)buf + (len & ~3), 1);
 306                 }
 307         } else {
 308                 if (mmio)
 309                         __ide_mm_insw((void __iomem *)data_addr, buf, len / 2);
 310                 else
 311                         insw(data_addr, buf, len / 2);
 312         }
 313 }
 314 EXPORT_SYMBOL_GPL(ide_input_data);
 315
 316 /*
 317  * This is used for most PIO data transfers *to* the IDE interface
 318  */
 319 void ide_output_data(ide_drive_t *drive, struct request *rq, void *buf,
 320                      unsigned int len)
 321 {
 322         ide_hwif_t *hwif = drive->hwif;
 323         struct ide_io_ports *io_ports = &hwif->io_ports;
 324         unsigned long data_addr = io_ports->data_addr;
 325         u8 io_32bit = drive->io_32bit;
 326         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 327
 328         if (io_32bit) {
 329                 unsigned long uninitialized_var(flags);
 330
 331                 if ((io_32bit & 2) && !mmio) {
 332                         local_irq_save(flags);
 333                         ata_vlb_sync(io_ports->nsect_addr);
 334                 }
 335
 336                 if (mmio)
 337                         __ide_mm_outsl((void __iomem *)data_addr, buf, len / 4);
 338                 else
 339                         outsl(data_addr, buf, len / 4);
 340
 341                 if ((io_32bit & 2) && !mmio)
 342                         local_irq_restore(flags);
 343
 344                 if ((len & 3) >= 2) {
 345                         if (mmio)
 346                                 __ide_mm_outsw((void __iomem *)data_addr,
 347                                                  (u8 *)buf + (len & ~3), 1);
 348                         else
 349                                 outsw(data_addr, (u8 *)buf + (len & ~3), 1);
 350                 }
 351         } else {
 352                 if (mmio)
 353                         __ide_mm_outsw((void __iomem *)data_addr, buf, len / 2);
 354                 else
 355                         outsw(data_addr, buf, len / 2);
 356         }
 357 }
 358 EXPORT_SYMBOL_GPL(ide_output_data);
 359
 360 u8 ide_read_error(ide_drive_t *drive)
 361 {
 362         ide_task_t task;
 363
 364         memset(&task, 0, sizeof(task));
 365         task.tf_flags = IDE_TFLAG_IN_FEATURE;
 366
 367         drive->hwif->tp_ops->tf_read(drive, &task);
 368
 369         return task.tf.error;
 370 }
 371 EXPORT_SYMBOL_GPL(ide_read_error);
 372
 373 void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
 374 {
 375         ide_task_t task;
 376
 377         memset(&task, 0, sizeof(task));
 378         task.tf_flags = IDE_TFLAG_IN_LBAH | IDE_TFLAG_IN_LBAM |
 379                         IDE_TFLAG_IN_NSECT;
 380
 381         drive->hwif->tp_ops->tf_read(drive, &task);
 382
 383         *bcount = (task.tf.lbah << 8) | task.tf.lbam;
 384         *ireason = task.tf.nsect & 3;
 385 }
 386 EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason);
 387
 388 const struct ide_tp_ops default_tp_ops = {
 389         .exec_command           = ide_exec_command,
 390         .read_status            = ide_read_status,
 391         .read_altstatus         = ide_read_altstatus,
 392         .read_sff_dma_status    = ide_read_sff_dma_status,
 393
 394         .set_irq                = ide_set_irq,
 395
 396         .tf_load                = ide_tf_load,
 397         .tf_read                = ide_tf_read,
 398
 399         .input_data             = ide_input_data,
 400         .output_data            = ide_output_data,
 401 };
 402
 403 void ide_fix_driveid (struct hd_driveid *id)
 404 {
 405 #ifndef __LITTLE_ENDIAN
 406 # ifdef __BIG_ENDIAN
 407         int i;
 408         u16 *stringcast;
 409
 410         id->config         = __le16_to_cpu(id->config);
 411         id->cyls           = __le16_to_cpu(id->cyls);
 412         id->reserved2      = __le16_to_cpu(id->reserved2);
 413         id->heads          = __le16_to_cpu(id->heads);
 414         id->track_bytes    = __le16_to_cpu(id->track_bytes);
 415         id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
 416         id->sectors        = __le16_to_cpu(id->sectors);
 417         id->vendor0        = __le16_to_cpu(id->vendor0);
 418         id->vendor1        = __le16_to_cpu(id->vendor1);
 419         id->vendor2        = __le16_to_cpu(id->vendor2);
 420         stringcast = (u16 *)&id->serial_no[0];
 421         for (i = 0; i < (20/2); i++)
 422                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 423         id->buf_type       = __le16_to_cpu(id->buf_type);
 424         id->buf_size       = __le16_to_cpu(id->buf_size);
 425         id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
 426         stringcast = (u16 *)&id->fw_rev[0];
 427         for (i = 0; i < (8/2); i++)
 428                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 429         stringcast = (u16 *)&id->model[0];
 430         for (i = 0; i < (40/2); i++)
 431                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 432         id->dword_io       = __le16_to_cpu(id->dword_io);
 433         id->reserved50     = __le16_to_cpu(id->reserved50);
 434         id->field_valid    = __le16_to_cpu(id->field_valid);
 435         id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
 436         id->cur_heads      = __le16_to_cpu(id->cur_heads);
 437         id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
 438         id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
 439         id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
 440         id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
 441         id->dma_1word      = __le16_to_cpu(id->dma_1word);
 442         id->dma_mword      = __le16_to_cpu(id->dma_mword);
 443         id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
 444         id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
 445         id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
 446         id->eide_pio       = __le16_to_cpu(id->eide_pio);
 447         id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
 448         for (i = 0; i < 2; ++i)
 449                 id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
 450         for (i = 0; i < 4; ++i)
 451                 id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
 452         id->queue_depth    = __le16_to_cpu(id->queue_depth);
 453         for (i = 0; i < 4; ++i)
 454                 id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
 455         id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
 456         id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
 457         id->command_set_1  = __le16_to_cpu(id->command_set_1);
 458         id->command_set_2  = __le16_to_cpu(id->command_set_2);
 459         id->cfsse          = __le16_to_cpu(id->cfsse);
 460         id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
 461         id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
 462         id->csf_default    = __le16_to_cpu(id->csf_default);
 463         id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
 464         id->trseuc         = __le16_to_cpu(id->trseuc);
 465         id->trsEuc         = __le16_to_cpu(id->trsEuc);
 466         id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
 467         id->mprc           = __le16_to_cpu(id->mprc);
 468         id->hw_config      = __le16_to_cpu(id->hw_config);
 469         id->acoustic       = __le16_to_cpu(id->acoustic);
 470         id->msrqs          = __le16_to_cpu(id->msrqs);
 471         id->sxfert         = __le16_to_cpu(id->sxfert);
 472         id->sal            = __le16_to_cpu(id->sal);
 473         id->spg            = __le32_to_cpu(id->spg);
 474         id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
 475         for (i = 0; i < 22; i++)
 476                 id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
 477         id->last_lun       = __le16_to_cpu(id->last_lun);
 478         id->word127        = __le16_to_cpu(id->word127);
 479         id->dlf            = __le16_to_cpu(id->dlf);
 480         id->csfo           = __le16_to_cpu(id->csfo);
 481         for (i = 0; i < 26; i++)
 482                 id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
 483         id->word156        = __le16_to_cpu(id->word156);
 484         for (i = 0; i < 3; i++)
 485                 id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
 486         id->cfa_power      = __le16_to_cpu(id->cfa_power);
 487         for (i = 0; i < 15; i++)
 488                 id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
 489         for (i = 0; i < 30; i++)
 490                 id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
 491         for (i = 0; i < 49; i++)
 492                 id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
 493         id->integrity_word  = __le16_to_cpu(id->integrity_word);
 494 # else
 495 #  error "Please fix <asm/byteorder.h>"
 496 # endif
 497 #endif
 498 }
 499
 500 /*
 501  * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
 502  * removing leading/trailing blanks and compressing internal blanks.
 503  * It is primarily used to tidy up the model name/number fields as
 504  * returned by the WIN_[P]IDENTIFY commands.
 505  */
 506
 507 void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
 508 {
 509         u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
 510
 511         if (byteswap) {
 512                 /* convert from big-endian to host byte order */
 513                 for (p = end ; p != s;)
 514                         be16_to_cpus((u16 *)(p -= 2));
 515         }
 516         /* strip leading blanks */
 517         while (s != end && *s == ' ')
 518                 ++s;
 519         /* compress internal blanks and strip trailing blanks */
 520         while (s != end && *s) {
 521                 if (*s++ != ' ' || (s != end && *s && *s != ' '))
 522                         *p++ = *(s-1);
 523         }
 524         /* wipe out trailing garbage */
 525         while (p != end)
 526                 *p++ = '\0';
 527 }
 528
 529 EXPORT_SYMBOL(ide_fixstring);
 530
 531 /*
 532  * Needed for PCI irq sharing
 533  */
 534 int drive_is_ready (ide_drive_t *drive)
 535 {
 536         ide_hwif_t *hwif        = HWIF(drive);
 537         u8 stat                 = 0;
 538
 539         if (drive->waiting_for_dma)
 540                 return hwif->dma_ops->dma_test_irq(drive);
 541
 542 #if 0
 543         /* need to guarantee 400ns since last command was issued */
 544         udelay(1);
 545 #endif
 546
 547         /*
 548          * We do a passive status test under shared PCI interrupts on
 549          * cards that truly share the ATA side interrupt, but may also share
 550          * an interrupt with another pci card/device.  We make no assumptions
 551          * about possible isa-pnp and pci-pnp issues yet.
 552          */
 553         if (hwif->io_ports.ctl_addr)
 554                 stat = hwif->tp_ops->read_altstatus(hwif);
 555         else
 556                 /* Note: this may clear a pending IRQ!! */
 557                 stat = hwif->tp_ops->read_status(hwif);
 558
 559         if (stat & BUSY_STAT)
 560                 /* drive busy:  definitely not interrupting */
 561                 return 0;
 562
 563         /* drive ready: *might* be interrupting */
 564         return 1;
 565 }
 566
 567 EXPORT_SYMBOL(drive_is_ready);
 568
 569 /*
 570  * This routine busy-waits for the drive status to be not "busy".
 571  * It then checks the status for all of the "good" bits and none
 572  * of the "bad" bits, and if all is okay it returns 0.  All other
 573  * cases return error -- caller may then invoke ide_error().
 574  *
 575  * This routine should get fixed to not hog the cpu during extra long waits..
 576  * That could be done by busy-waiting for the first jiffy or two, and then
 577  * setting a timer to wake up at half second intervals thereafter,
 578  * until timeout is achieved, before timing out.
 579  */
 580 static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout, u8 *rstat)
 581 {
 582         ide_hwif_t *hwif = drive->hwif;
 583         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 584         unsigned long flags;
 585         int i;
 586         u8 stat;
 587
 588         udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
 589         stat = tp_ops->read_status(hwif);
 590
 591         if (stat & BUSY_STAT) {
 592                 local_irq_set(flags);
 593                 timeout += jiffies;
 594                 while ((stat = tp_ops->read_status(hwif)) & BUSY_STAT) {
 595                         if (time_after(jiffies, timeout)) {
 596                                 /*
 597                                  * One last read after the timeout in case
 598                                  * heavy interrupt load made us not make any
 599                                  * progress during the timeout..
 600                                  */
 601                                 stat = tp_ops->read_status(hwif);
 602                                 if (!(stat & BUSY_STAT))
 603                                         break;
 604
 605                                 local_irq_restore(flags);
 606                                 *rstat = stat;
 607                                 return -EBUSY;
 608                         }
 609                 }
 610                 local_irq_restore(flags);
 611         }
 612         /*
 613          * Allow status to settle, then read it again.
 614          * A few rare drives vastly violate the 400ns spec here,
 615          * so we'll wait up to 10usec for a "good" status
 616          * rather than expensively fail things immediately.
 617          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 618          */
 619         for (i = 0; i < 10; i++) {
 620                 udelay(1);
 621                 stat = tp_ops->read_status(hwif);
 622
 623                 if (OK_STAT(stat, good, bad)) {
 624                         *rstat = stat;
 625                         return 0;
 626                 }
 627         }
 628         *rstat = stat;
 629         return -EFAULT;
 630 }
 631
 632 /*
 633  * In case of error returns error value after doing "*startstop = ide_error()".
 634  * The caller should return the updated value of "startstop" in this case,
 635  * "startstop" is unchanged when the function returns 0.
 636  */
 637 int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
 638 {
 639         int err;
 640         u8 stat;
 641
 642         /* bail early if we've exceeded max_failures */
 643         if (drive->max_failures && (drive->failures > drive->max_failures)) {
 644                 *startstop = ide_stopped;
 645                 return 1;
 646         }
 647
 648         err = __ide_wait_stat(drive, good, bad, timeout, &stat);
 649
 650         if (err) {
 651                 char *s = (err == -EBUSY) ? "status timeout" : "status error";
 652                 *startstop = ide_error(drive, s, stat);
 653         }
 654
 655         return err;
 656 }
 657
 658 EXPORT_SYMBOL(ide_wait_stat);
 659
 660 /**
 661  *      ide_in_drive_list       -       look for drive in black/white list
 662  *      @id: drive identifier
 663  *      @drive_table: list to inspect
 664  *
 665  *      Look for a drive in the blacklist and the whitelist tables
 666  *      Returns 1 if the drive is found in the table.
 667  */
 668
 669 int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
 670 {
 671         for ( ; drive_table->id_model; drive_table++)
 672                 if ((!strcmp(drive_table->id_model, id->model)) &&
 673                     (!drive_table->id_firmware ||
 674                      strstr(id->fw_rev, drive_table->id_firmware)))
 675                         return 1;
 676         return 0;
 677 }
 678
 679 EXPORT_SYMBOL_GPL(ide_in_drive_list);
 680
 681 /*
 682  * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
 683  * We list them here and depend on the device side cable detection for them.
 684  *
 685  * Some optical devices with the buggy firmwares have the same problem.
 686  */
 687 static const struct drive_list_entry ivb_list[] = {
 688         { "QUANTUM FIREBALLlct10 05"    , "A03.0900"    },
 689         { "TSSTcorp CDDVDW SH-S202J"    , "SB00"        },
 690         { "TSSTcorp CDDVDW SH-S202J"    , "SB01"        },
 691         { "TSSTcorp CDDVDW SH-S202N"    , "SB00"        },
 692         { "TSSTcorp CDDVDW SH-S202N"    , "SB01"        },
 693         { "TSSTcorp CDDVDW SH-S202H"    , "SB00"        },
 694         { "TSSTcorp CDDVDW SH-S202H"    , "SB01"        },
 695         { NULL                          , NULL          }
 696 };
 697
 698 /*
 699  *  All hosts that use the 80c ribbon must use!
 700  *  The name is derived from upper byte of word 93 and the 80c ribbon.
 701  */
 702 u8 eighty_ninty_three (ide_drive_t *drive)
 703 {
 704         ide_hwif_t *hwif = drive->hwif;
 705         struct hd_driveid *id = drive->id;
 706         int ivb = ide_in_drive_list(id, ivb_list);
 707
 708         if (hwif->cbl == ATA_CBL_PATA40_SHORT)
 709                 return 1;
 710
 711         if (ivb)
 712                 printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
 713                                   drive->name);
 714
 715         if (ide_dev_is_sata(id) && !ivb)
 716                 return 1;
 717
 718         if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
 719                 goto no_80w;
 720
 721         /*
 722          * FIXME:
 723          * - change master/slave IDENTIFY order
 724          * - force bit13 (80c cable present) check also for !ivb devices
 725          *   (unless the slave device is pre-ATA3)
 726          */
 727         if ((id->hw_config & 0x4000) || (ivb && (id->hw_config & 0x2000)))
 728                 return 1;
 729
 730 no_80w:
 731         if (drive->udma33_warned == 1)
 732                 return 0;
 733
 734         printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
 735                             "limiting max speed to UDMA33\n",
 736                             drive->name,
 737                             hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
 738
 739         drive->udma33_warned = 1;
 740
 741         return 0;
 742 }
 743
 744 int ide_driveid_update(ide_drive_t *drive)
 745 {
 746         ide_hwif_t *hwif = drive->hwif;
 747         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 748         struct hd_driveid *id;
 749         unsigned long timeout, flags;
 750         u8 stat;
 751
 752         /*
 753          * Re-read drive->id for possible DMA mode
 754          * change (copied from ide-probe.c)
 755          */
 756
 757         SELECT_MASK(drive, 1);
 758         tp_ops->set_irq(hwif, 0);
 759         msleep(50);
 760         tp_ops->exec_command(hwif, WIN_IDENTIFY);
 761         timeout = jiffies + WAIT_WORSTCASE;
 762         do {
 763                 if (time_after(jiffies, timeout)) {
 764                         SELECT_MASK(drive, 0);
 765                         return 0;       /* drive timed-out */
 766                 }
 767
 768                 msleep(50);     /* give drive a breather */
 769                 stat = tp_ops->read_altstatus(hwif);
 770         } while (stat & BUSY_STAT);
 771
 772         msleep(50);     /* wait for IRQ and DRQ_STAT */
 773         stat = tp_ops->read_status(hwif);
 774
 775         if (!OK_STAT(stat, DRQ_STAT, BAD_R_STAT)) {
 776                 SELECT_MASK(drive, 0);
 777                 printk("%s: CHECK for good STATUS\n", drive->name);
 778                 return 0;
 779         }
 780         local_irq_save(flags);
 781         SELECT_MASK(drive, 0);
 782         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 783         if (!id) {
 784                 local_irq_restore(flags);
 785                 return 0;
 786         }
 787         tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
 788         (void)tp_ops->read_status(hwif);        /* clear drive IRQ */
 789         local_irq_enable();
 790         local_irq_restore(flags);
 791         ide_fix_driveid(id);
 792         if (id) {
 793                 drive->id->dma_ultra = id->dma_ultra;
 794                 drive->id->dma_mword = id->dma_mword;
 795                 drive->id->dma_1word = id->dma_1word;
 796                 /* anything more ? */
 797                 kfree(id);
 798
 799                 if (drive->using_dma && ide_id_dma_bug(drive))
 800                         ide_dma_off(drive);
 801         }
 802
 803         return 1;
 804 }
 805
 806 int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 807 {
 808         ide_hwif_t *hwif = drive->hwif;
 809         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 810         int error = 0;
 811         u8 stat;
 812         ide_task_t task;
 813
 814 #ifdef CONFIG_BLK_DEV_IDEDMA
 815         if (hwif->dma_ops)      /* check if host supports DMA */
 816                 hwif->dma_ops->dma_host_set(drive, 0);
 817 #endif
 818
 819         /* Skip setting PIO flow-control modes on pre-EIDE drives */
 820         if ((speed & 0xf8) == XFER_PIO_0 && !(drive->id->capability & 0x08))
 821                 goto skip;
 822
 823         /*
 824          * Don't use ide_wait_cmd here - it will
 825          * attempt to set_geometry and recalibrate,
 826          * but for some reason these don't work at
 827          * this point (lost interrupt).
 828          */
 829         /*
 830          * Select the drive, and issue the SETFEATURES command
 831          */
 832         disable_irq_nosync(hwif->irq);
 833
 834         /*
 835          *      FIXME: we race against the running IRQ here if
 836          *      this is called from non IRQ context. If we use
 837          *      disable_irq() we hang on the error path. Work
 838          *      is needed.
 839          */
 840
 841         udelay(1);
 842         SELECT_DRIVE(drive);
 843         SELECT_MASK(drive, 0);
 844         udelay(1);
 845         tp_ops->set_irq(hwif, 0);
 846
 847         memset(&task, 0, sizeof(task));
 848         task.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT;
 849         task.tf.feature = SETFEATURES_XFER;
 850         task.tf.nsect   = speed;
 851
 852         tp_ops->tf_load(drive, &task);
 853
 854         tp_ops->exec_command(hwif, WIN_SETFEATURES);
 855
 856         if (drive->quirk_list == 2)
 857                 tp_ops->set_irq(hwif, 1);
 858
 859         error = __ide_wait_stat(drive, drive->ready_stat,
 860                                 BUSY_STAT|DRQ_STAT|ERR_STAT,
 861                                 WAIT_CMD, &stat);
 862
 863         SELECT_MASK(drive, 0);
 864
 865         enable_irq(hwif->irq);
 866
 867         if (error) {
 868                 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
 869                 return error;
 870         }
 871
 872         drive->id->dma_ultra &= ~0xFF00;
 873         drive->id->dma_mword &= ~0x0F00;
 874         drive->id->dma_1word &= ~0x0F00;
 875
 876  skip:
 877 #ifdef CONFIG_BLK_DEV_IDEDMA
 878         if (speed >= XFER_SW_DMA_0 && drive->using_dma)
 879                 hwif->dma_ops->dma_host_set(drive, 1);
 880         else if (hwif->dma_ops) /* check if host supports DMA */
 881                 ide_dma_off_quietly(drive);
 882 #endif
 883
 884         switch(speed) {
 885                 case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
 886                 case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
 887                 case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
 888                 case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
 889                 case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
 890                 case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
 891                 case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
 892                 case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
 893                 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
 894                 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
 895                 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
 896                 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
 897                 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
 898                 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
 899                 default: break;
 900         }
 901         if (!drive->init_speed)
 902                 drive->init_speed = speed;
 903         drive->current_speed = speed;
 904         return error;
 905 }
 906
 907 /*
 908  * This should get invoked any time we exit the driver to
 909  * wait for an interrupt response from a drive.  handler() points
 910  * at the appropriate code to handle the next interrupt, and a
 911  * timer is started to prevent us from waiting forever in case
 912  * something goes wrong (see the ide_timer_expiry() handler later on).
 913  *
 914  * See also ide_execute_command
 915  */
 916 static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 917                       unsigned int timeout, ide_expiry_t *expiry)
 918 {
 919         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 920
 921         BUG_ON(hwgroup->handler);
 922         hwgroup->handler        = handler;
 923         hwgroup->expiry         = expiry;
 924         hwgroup->timer.expires  = jiffies + timeout;
 925         hwgroup->req_gen_timer  = hwgroup->req_gen;
 926         add_timer(&hwgroup->timer);
 927 }
 928
 929 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 930                       unsigned int timeout, ide_expiry_t *expiry)
 931 {
 932         unsigned long flags;
 933         spin_lock_irqsave(&ide_lock, flags);
 934         __ide_set_handler(drive, handler, timeout, expiry);
 935         spin_unlock_irqrestore(&ide_lock, flags);
 936 }
 937
 938 EXPORT_SYMBOL(ide_set_handler);
 939
 940 /**
 941  *      ide_execute_command     -       execute an IDE command
 942  *      @drive: IDE drive to issue the command against
 943  *      @command: command byte to write
 944  *      @handler: handler for next phase
 945  *      @timeout: timeout for command
 946  *      @expiry:  handler to run on timeout
 947  *
 948  *      Helper function to issue an IDE command. This handles the
 949  *      atomicity requirements, command timing and ensures that the
 950  *      handler and IRQ setup do not race. All IDE command kick off
 951  *      should go via this function or do equivalent locking.
 952  */
 953
 954 void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler,
 955                          unsigned timeout, ide_expiry_t *expiry)
 956 {
 957         unsigned long flags;
 958         ide_hwif_t *hwif = HWIF(drive);
 959
 960         spin_lock_irqsave(&ide_lock, flags);
 961         __ide_set_handler(drive, handler, timeout, expiry);
 962         hwif->tp_ops->exec_command(hwif, cmd);
 963         /*
 964          * Drive takes 400nS to respond, we must avoid the IRQ being
 965          * serviced before that.
 966          *
 967          * FIXME: we could skip this delay with care on non shared devices
 968          */
 969         ndelay(400);
 970         spin_unlock_irqrestore(&ide_lock, flags);
 971 }
 972 EXPORT_SYMBOL(ide_execute_command);
 973
 974 void ide_execute_pkt_cmd(ide_drive_t *drive)
 975 {
 976         ide_hwif_t *hwif = drive->hwif;
 977         unsigned long flags;
 978
 979         spin_lock_irqsave(&ide_lock, flags);
 980         hwif->tp_ops->exec_command(hwif, WIN_PACKETCMD);
 981         ndelay(400);
 982         spin_unlock_irqrestore(&ide_lock, flags);
 983 }
 984 EXPORT_SYMBOL_GPL(ide_execute_pkt_cmd);
 985
 986 static inline void ide_complete_drive_reset(ide_drive_t *drive, int err)
 987 {
 988         struct request *rq = drive->hwif->hwgroup->rq;
 989
 990         if (rq && blk_special_request(rq) && rq->cmd[0] == REQ_DRIVE_RESET)
 991                 ide_end_request(drive, err ? err : 1, 0);
 992 }
 993
 994 /* needed below */
 995 static ide_startstop_t do_reset1 (ide_drive_t *, int);
 996
 997 /*
 998  * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 999  * during an atapi drive reset operation. If the drive has not yet responded,
1000  * and we have not yet hit our maximum waiting time, then the timer is restarted
1001  * for another 50ms.
1002  */
1003 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
1004 {
1005         ide_hwif_t *hwif = drive->hwif;
1006         ide_hwgroup_t *hwgroup = hwif->hwgroup;
1007         u8 stat;
1008
1009         SELECT_DRIVE(drive);
1010         udelay (10);
1011         stat = hwif->tp_ops->read_status(hwif);
1012
1013         if (OK_STAT(stat, 0, BUSY_STAT))
1014                 printk("%s: ATAPI reset complete\n", drive->name);
1015         else {
1016                 if (time_before(jiffies, hwgroup->poll_timeout)) {
1017                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1018                         /* continue polling */
1019                         return ide_started;
1020                 }
1021                 /* end of polling */
1022                 hwgroup->polling = 0;
1023                 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
1024                                 drive->name, stat);
1025                 /* do it the old fashioned way */
1026                 return do_reset1(drive, 1);
1027         }
1028         /* done polling */
1029         hwgroup->polling = 0;
1030         ide_complete_drive_reset(drive, 0);
1031         return ide_stopped;
1032 }
1033
1034 /*
1035  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
1036  * during an ide reset operation. If the drives have not yet responded,
1037  * and we have not yet hit our maximum waiting time, then the timer is restarted
1038  * for another 50ms.
1039  */
1040 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
1041 {
1042         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
1043         ide_hwif_t *hwif        = HWIF(drive);
1044         const struct ide_port_ops *port_ops = hwif->port_ops;
1045         u8 tmp;
1046         int err = 0;
1047
1048         if (port_ops && port_ops->reset_poll) {
1049                 err = port_ops->reset_poll(drive);
1050                 if (err) {
1051                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
1052                                 hwif->name, drive->name);
1053                         goto out;
1054                 }
1055         }
1056
1057         tmp = hwif->tp_ops->read_status(hwif);
1058
1059         if (!OK_STAT(tmp, 0, BUSY_STAT)) {
1060                 if (time_before(jiffies, hwgroup->poll_timeout)) {
1061                         ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1062                         /* continue polling */
1063                         return ide_started;
1064                 }
1065                 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
1066                 drive->failures++;
1067                 err = -EIO;
1068         } else  {
1069                 printk("%s: reset: ", hwif->name);
1070                 tmp = ide_read_error(drive);
1071
1072                 if (tmp == 1) {
1073                         printk("success\n");
1074                         drive->failures = 0;
1075                 } else {
1076                         drive->failures++;
1077                         printk("master: ");
1078                         switch (tmp & 0x7f) {
1079                                 case 1: printk("passed");
1080                                         break;
1081                                 case 2: printk("formatter device error");
1082                                         break;
1083                                 case 3: printk("sector buffer error");
1084                                         break;
1085                                 case 4: printk("ECC circuitry error");
1086                                         break;
1087                                 case 5: printk("controlling MPU error");
1088                                         break;
1089                                 default:printk("error (0x%02x?)", tmp);
1090                         }
1091                         if (tmp & 0x80)
1092                                 printk("; slave: failed");
1093                         printk("\n");
1094                         err = -EIO;
1095                 }
1096         }
1097 out:
1098         hwgroup->polling = 0;   /* done polling */
1099         ide_complete_drive_reset(drive, err);
1100         return ide_stopped;
1101 }
1102
1103 static void ide_disk_pre_reset(ide_drive_t *drive)
1104 {
1105         int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;
1106
1107         drive->special.all = 0;
1108         drive->special.b.set_geometry = legacy;
1109         drive->special.b.recalibrate  = legacy;
1110         drive->mult_count = 0;
1111         if (!drive->keep_settings && !drive->using_dma)
1112                 drive->mult_req = 0;
1113         if (drive->mult_req != drive->mult_count)
1114                 drive->special.b.set_multmode = 1;
1115 }
1116
1117 static void pre_reset(ide_drive_t *drive)
1118 {
1119         const struct ide_port_ops *port_ops = drive->hwif->port_ops;
1120
1121         if (drive->media == ide_disk)
1122                 ide_disk_pre_reset(drive);
1123         else
1124                 drive->post_reset = 1;
1125
1126         if (drive->using_dma) {
1127                 if (drive->crc_count)
1128                         ide_check_dma_crc(drive);
1129                 else
1130                         ide_dma_off(drive);
1131         }
1132
1133         if (!drive->keep_settings) {
1134                 if (!drive->using_dma) {
1135                         drive->unmask = 0;
1136                         drive->io_32bit = 0;
1137                 }
1138                 return;
1139         }
1140
1141         if (port_ops && port_ops->pre_reset)
1142                 port_ops->pre_reset(drive);
1143
1144         if (drive->current_speed != 0xff)
1145                 drive->desired_speed = drive->current_speed;
1146         drive->current_speed = 0xff;
1147 }
1148
1149 /*
1150  * do_reset1() attempts to recover a confused drive by resetting it.
1151  * Unfortunately, resetting a disk drive actually resets all devices on
1152  * the same interface, so it can really be thought of as resetting the
1153  * interface rather than resetting the drive.
1154  *
1155  * ATAPI devices have their own reset mechanism which allows them to be
1156  * individually reset without clobbering other devices on the same interface.
1157  *
1158  * Unfortunately, the IDE interface does not generate an interrupt to let
1159  * us know when the reset operation has finished, so we must poll for this.
1160  * Equally poor, though, is the fact that this may a very long time to complete,
1161  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
1162  * we set a timer to poll at 50ms intervals.
1163  */
1164 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
1165 {
1166         unsigned int unit;
1167         unsigned long flags;
1168         ide_hwif_t *hwif;
1169         ide_hwgroup_t *hwgroup;
1170         struct ide_io_ports *io_ports;
1171         const struct ide_tp_ops *tp_ops;
1172         const struct ide_port_ops *port_ops;
1173
1174         spin_lock_irqsave(&ide_lock, flags);
1175         hwif = HWIF(drive);
1176         hwgroup = HWGROUP(drive);
1177
1178         io_ports = &hwif->io_ports;
1179
1180         tp_ops = hwif->tp_ops;
1181
1182         /* We must not reset with running handlers */
1183         BUG_ON(hwgroup->handler != NULL);
1184
1185         /* For an ATAPI device, first try an ATAPI SRST. */
1186         if (drive->media != ide_disk && !do_not_try_atapi) {
1187                 pre_reset(drive);
1188                 SELECT_DRIVE(drive);
1189                 udelay (20);
1190                 tp_ops->exec_command(hwif, WIN_SRST);
1191                 ndelay(400);
1192                 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1193                 hwgroup->polling = 1;
1194                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1195                 spin_unlock_irqrestore(&ide_lock, flags);
1196                 return ide_started;
1197         }
1198
1199         /*
1200          * First, reset any device state data we were maintaining
1201          * for any of the drives on this interface.
1202          */
1203         for (unit = 0; unit < MAX_DRIVES; ++unit)
1204                 pre_reset(&hwif->drives[unit]);
1205
1206         if (io_ports->ctl_addr == 0) {
1207                 spin_unlock_irqrestore(&ide_lock, flags);
1208                 ide_complete_drive_reset(drive, -ENXIO);
1209                 return ide_stopped;
1210         }
1211
1212         /*
1213          * Note that we also set nIEN while resetting the device,
1214          * to mask unwanted interrupts from the interface during the reset.
1215          * However, due to the design of PC hardware, this will cause an
1216          * immediate interrupt due to the edge transition it produces.
1217          * This single interrupt gives us a "fast poll" for drives that
1218          * recover from reset very quickly, saving us the first 50ms wait time.
1219          *
1220          * TODO: add ->softreset method and stop abusing ->set_irq
1221          */
1222         /* set SRST and nIEN */
1223         tp_ops->set_irq(hwif, 4);
1224         /* more than enough time */
1225         udelay(10);
1226         /* clear SRST, leave nIEN (unless device is on the quirk list) */
1227         tp_ops->set_irq(hwif, drive->quirk_list == 2);
1228         /* more than enough time */
1229         udelay(10);
1230         hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1231         hwgroup->polling = 1;
1232         __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1233
1234         /*
1235          * Some weird controller like resetting themselves to a strange
1236          * state when the disks are reset this way. At least, the Winbond
1237          * 553 documentation says that
1238          */
1239         port_ops = hwif->port_ops;
1240         if (port_ops && port_ops->resetproc)
1241                 port_ops->resetproc(drive);
1242
1243         spin_unlock_irqrestore(&ide_lock, flags);
1244         return ide_started;
1245 }
1246
1247 /*
1248  * ide_do_reset() is the entry point to the drive/interface reset code.
1249  */
1250
1251 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1252 {
1253         return do_reset1(drive, 0);
1254 }
1255
1256 EXPORT_SYMBOL(ide_do_reset);
1257
1258 /*
1259  * ide_wait_not_busy() waits for the currently selected device on the hwif
1260  * to report a non-busy status, see comments in ide_probe_port().
1261  */
1262 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1263 {
1264         u8 stat = 0;
1265
1266         while(timeout--) {
1267                 /*
1268                  * Turn this into a schedule() sleep once I'm sure
1269                  * about locking issues (2.5 work ?).
1270                  */
1271                 mdelay(1);
1272                 stat = hwif->tp_ops->read_status(hwif);
1273                 if ((stat & BUSY_STAT) == 0)
1274                         return 0;
1275                 /*
1276                  * Assume a value of 0xff means nothing is connected to
1277                  * the interface and it doesn't implement the pull-down
1278                  * resistor on D7.
1279                  */
1280                 if (stat == 0xff)
1281                         return -ENODEV;
1282                 touch_softlockup_watchdog();
1283                 touch_nmi_watchdog();
1284         }
1285         return -EBUSY;
1286 }
1287
1288 EXPORT_SYMBOL_GPL(ide_wait_not_busy);
1289