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