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

   1 /*
   2  *  Copyright (C) 2000-2002     Andre Hedrick <andre@linux-ide.org>
   3  *  Copyright (C) 2003          Red Hat <alan@redhat.com>
   4  *
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/types.h>
   9 #include <linux/string.h>
  10 #include <linux/kernel.h>
  11 #include <linux/timer.h>
  12 #include <linux/mm.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/major.h>
  15 #include <linux/errno.h>
  16 #include <linux/genhd.h>
  17 #include <linux/blkpg.h>
  18 #include <linux/slab.h>
  19 #include <linux/pci.h>
  20 #include <linux/delay.h>
  21 #include <linux/hdreg.h>
  22 #include <linux/ide.h>
  23 #include <linux/bitops.h>
  24 #include <linux/nmi.h>
  25
  26 #include <asm/byteorder.h>
  27 #include <asm/irq.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/io.h>
  30
  31 /*
  32  *      Conventional PIO operations for ATA devices
  33  */
  34
  35 static u8 ide_inb (unsigned long port)
  36 {
  37         return (u8) inb(port);
  38 }
  39
  40 static void ide_outb (u8 val, unsigned long port)
  41 {
  42         outb(val, port);
  43 }
  44
  45 static void ide_outbsync(ide_hwif_t *hwif, u8 addr, unsigned long port)
  46 {
  47         outb(addr, port);
  48 }
  49
  50 void default_hwif_iops (ide_hwif_t *hwif)
  51 {
  52         hwif->OUTB      = ide_outb;
  53         hwif->OUTBSYNC  = ide_outbsync;
  54         hwif->INB       = ide_inb;
  55 }
  56
  57 /*
  58  *      MMIO operations, typically used for SATA controllers
  59  */
  60
  61 static u8 ide_mm_inb (unsigned long port)
  62 {
  63         return (u8) readb((void __iomem *) port);
  64 }
  65
  66 static void ide_mm_outb (u8 value, unsigned long port)
  67 {
  68         writeb(value, (void __iomem *) port);
  69 }
  70
  71 static void ide_mm_outbsync(ide_hwif_t *hwif, u8 value, unsigned long port)
  72 {
  73         writeb(value, (void __iomem *) port);
  74 }
  75
  76 void default_hwif_mmiops (ide_hwif_t *hwif)
  77 {
  78         hwif->OUTB      = ide_mm_outb;
  79         /* Most systems will need to override OUTBSYNC, alas however
  80            this one is controller specific! */
  81         hwif->OUTBSYNC  = ide_mm_outbsync;
  82         hwif->INB       = ide_mm_inb;
  83 }
  84
  85 EXPORT_SYMBOL(default_hwif_mmiops);
  86
  87 void SELECT_DRIVE (ide_drive_t *drive)
  88 {
  89         ide_hwif_t *hwif = drive->hwif;
  90         const struct ide_port_ops *port_ops = hwif->port_ops;
  91         ide_task_t task;
  92
  93         if (port_ops && port_ops->selectproc)
  94                 port_ops->selectproc(drive);
  95
  96         memset(&task, 0, sizeof(task));
  97         task.tf_flags = IDE_TFLAG_OUT_DEVICE;
  98
  99         drive->hwif->tf_load(drive, &task);
 100 }
 101
 102 void SELECT_MASK(ide_drive_t *drive, int mask)
 103 {
 104         const struct ide_port_ops *port_ops = drive->hwif->port_ops;
 105
 106         if (port_ops && port_ops->maskproc)
 107                 port_ops->maskproc(drive, mask);
 108 }
 109
 110 static void ide_exec_command(ide_hwif_t *hwif, u8 cmd)
 111 {
 112         if (hwif->host_flags & IDE_HFLAG_MMIO)
 113                 writeb(cmd, (void __iomem *)hwif->io_ports.command_addr);
 114         else
 115                 outb(cmd, hwif->io_ports.command_addr);
 116 }
 117
 118 static u8 ide_read_status(ide_hwif_t *hwif)
 119 {
 120         if (hwif->host_flags & IDE_HFLAG_MMIO)
 121                 return readb((void __iomem *)hwif->io_ports.status_addr);
 122         else
 123                 return inb(hwif->io_ports.status_addr);
 124 }
 125
 126 static u8 ide_read_altstatus(ide_hwif_t *hwif)
 127 {
 128         if (hwif->host_flags & IDE_HFLAG_MMIO)
 129                 return readb((void __iomem *)hwif->io_ports.ctl_addr);
 130         else
 131                 return inb(hwif->io_ports.ctl_addr);
 132 }
 133
 134 static u8 ide_read_sff_dma_status(ide_hwif_t *hwif)
 135 {
 136         if (hwif->host_flags & IDE_HFLAG_MMIO)
 137                 return readb((void __iomem *)(hwif->dma_base + ATA_DMA_STATUS));
 138         else
 139                 return inb(hwif->dma_base + ATA_DMA_STATUS);
 140 }
 141
 142 static void ide_set_irq(ide_hwif_t *hwif, int on)
 143 {
 144         u8 ctl = ATA_DEVCTL_OBS;
 145
 146         if (on == 4) { /* hack for SRST */
 147                 ctl |= 4;
 148                 on &= ~4;
 149         }
 150
 151         ctl |= on ? 0 : 2;
 152
 153         if (hwif->host_flags & IDE_HFLAG_MMIO)
 154                 writeb(ctl, (void __iomem *)hwif->io_ports.ctl_addr);
 155         else
 156                 outb(ctl, hwif->io_ports.ctl_addr);
 157 }
 158
 159 static void ide_tf_load(ide_drive_t *drive, ide_task_t *task)
 160 {
 161         ide_hwif_t *hwif = drive->hwif;
 162         struct ide_io_ports *io_ports = &hwif->io_ports;
 163         struct ide_taskfile *tf = &task->tf;
 164         void (*tf_outb)(u8 addr, unsigned long port);
 165         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 166         u8 HIHI = (task->tf_flags & IDE_TFLAG_LBA48) ? 0xE0 : 0xEF;
 167
 168         if (mmio)
 169                 tf_outb = ide_mm_outb;
 170         else
 171                 tf_outb = ide_outb;
 172
 173         if (task->tf_flags & IDE_TFLAG_FLAGGED)
 174                 HIHI = 0xFF;
 175
 176         if (task->tf_flags & IDE_TFLAG_OUT_DATA) {
 177                 u16 data = (tf->hob_data << 8) | tf->data;
 178
 179                 if (mmio)
 180                         writew(data, (void __iomem *)io_ports->data_addr);
 181                 else
 182                         outw(data, io_ports->data_addr);
 183         }
 184
 185         if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
 186                 tf_outb(tf->hob_feature, io_ports->feature_addr);
 187         if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
 188                 tf_outb(tf->hob_nsect, io_ports->nsect_addr);
 189         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
 190                 tf_outb(tf->hob_lbal, io_ports->lbal_addr);
 191         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
 192                 tf_outb(tf->hob_lbam, io_ports->lbam_addr);
 193         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
 194                 tf_outb(tf->hob_lbah, io_ports->lbah_addr);
 195
 196         if (task->tf_flags & IDE_TFLAG_OUT_FEATURE)
 197                 tf_outb(tf->feature, io_ports->feature_addr);
 198         if (task->tf_flags & IDE_TFLAG_OUT_NSECT)
 199                 tf_outb(tf->nsect, io_ports->nsect_addr);
 200         if (task->tf_flags & IDE_TFLAG_OUT_LBAL)
 201                 tf_outb(tf->lbal, io_ports->lbal_addr);
 202         if (task->tf_flags & IDE_TFLAG_OUT_LBAM)
 203                 tf_outb(tf->lbam, io_ports->lbam_addr);
 204         if (task->tf_flags & IDE_TFLAG_OUT_LBAH)
 205                 tf_outb(tf->lbah, io_ports->lbah_addr);
 206
 207         if (task->tf_flags & IDE_TFLAG_OUT_DEVICE)
 208                 tf_outb((tf->device & HIHI) | drive->select.all,
 209                          io_ports->device_addr);
 210 }
 211
 212 static void ide_tf_read(ide_drive_t *drive, ide_task_t *task)
 213 {
 214         ide_hwif_t *hwif = drive->hwif;
 215         struct ide_io_ports *io_ports = &hwif->io_ports;
 216         struct ide_taskfile *tf = &task->tf;
 217         void (*tf_outb)(u8 addr, unsigned long port);
 218         u8 (*tf_inb)(unsigned long port);
 219         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 220
 221         if (mmio) {
 222                 tf_outb = ide_mm_outb;
 223                 tf_inb  = ide_mm_inb;
 224         } else {
 225                 tf_outb = ide_outb;
 226                 tf_inb  = ide_inb;
 227         }
 228
 229         if (task->tf_flags & IDE_TFLAG_IN_DATA) {
 230                 u16 data;
 231
 232                 if (mmio)
 233                         data = readw((void __iomem *)io_ports->data_addr);
 234                 else
 235                         data = inw(io_ports->data_addr);
 236
 237                 tf->data = data & 0xff;
 238                 tf->hob_data = (data >> 8) & 0xff;
 239         }
 240
 241         /* be sure we're looking at the low order bits */
 242         tf_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
 243
 244         if (task->tf_flags & IDE_TFLAG_IN_FEATURE)
 245                 tf->feature = tf_inb(io_ports->feature_addr);
 246         if (task->tf_flags & IDE_TFLAG_IN_NSECT)
 247                 tf->nsect  = tf_inb(io_ports->nsect_addr);
 248         if (task->tf_flags & IDE_TFLAG_IN_LBAL)
 249                 tf->lbal   = tf_inb(io_ports->lbal_addr);
 250         if (task->tf_flags & IDE_TFLAG_IN_LBAM)
 251                 tf->lbam   = tf_inb(io_ports->lbam_addr);
 252         if (task->tf_flags & IDE_TFLAG_IN_LBAH)
 253                 tf->lbah   = tf_inb(io_ports->lbah_addr);
 254         if (task->tf_flags & IDE_TFLAG_IN_DEVICE)
 255                 tf->device = tf_inb(io_ports->device_addr);
 256
 257         if (task->tf_flags & IDE_TFLAG_LBA48) {
 258                 tf_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
 259
 260                 if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
 261                         tf->hob_feature = tf_inb(io_ports->feature_addr);
 262                 if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
 263                         tf->hob_nsect   = tf_inb(io_ports->nsect_addr);
 264                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
 265                         tf->hob_lbal    = tf_inb(io_ports->lbal_addr);
 266                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
 267                         tf->hob_lbam    = tf_inb(io_ports->lbam_addr);
 268                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
 269                         tf->hob_lbah    = tf_inb(io_ports->lbah_addr);
 270         }
 271 }
 272
 273 /*
 274  * Some localbus EIDE interfaces require a special access sequence
 275  * when using 32-bit I/O instructions to transfer data.  We call this
 276  * the "vlb_sync" sequence, which consists of three successive reads
 277  * of the sector count register location, with interrupts disabled
 278  * to ensure that the reads all happen together.
 279  */
 280 static void ata_vlb_sync(unsigned long port)
 281 {
 282         (void)inb(port);
 283         (void)inb(port);
 284         (void)inb(port);
 285 }
 286
 287 /*
 288  * This is used for most PIO data transfers *from* the IDE interface
 289  *
 290  * These routines will round up any request for an odd number of bytes,
 291  * so if an odd len is specified, be sure that there's at least one
 292  * extra byte allocated for the buffer.
 293  */
 294 static void ata_input_data(ide_drive_t *drive, struct request *rq,
 295                            void *buf, unsigned int len)
 296 {
 297         ide_hwif_t *hwif = drive->hwif;
 298         struct ide_io_ports *io_ports = &hwif->io_ports;
 299         unsigned long data_addr = io_ports->data_addr;
 300         u8 io_32bit = drive->io_32bit;
 301         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 302
 303         len++;
 304
 305         if (io_32bit) {
 306                 unsigned long uninitialized_var(flags);
 307
 308                 if ((io_32bit & 2) && !mmio) {
 309                         local_irq_save(flags);
 310                         ata_vlb_sync(io_ports->nsect_addr);
 311                 }
 312
 313                 if (mmio)
 314                         __ide_mm_insl((void __iomem *)data_addr, buf, len / 4);
 315                 else
 316                         insl(data_addr, buf, len / 4);
 317
 318                 if ((io_32bit & 2) && !mmio)
 319                         local_irq_restore(flags);
 320
 321                 if ((len & 3) >= 2) {
 322                         if (mmio)
 323                                 __ide_mm_insw((void __iomem *)data_addr,
 324                                                 (u8 *)buf + (len & ~3), 1);
 325                         else
 326                                 insw(data_addr, (u8 *)buf + (len & ~3), 1);
 327                 }
 328         } else {
 329                 if (mmio)
 330                         __ide_mm_insw((void __iomem *)data_addr, buf, len / 2);
 331                 else
 332                         insw(data_addr, buf, len / 2);
 333         }
 334 }
 335
 336 /*
 337  * This is used for most PIO data transfers *to* the IDE interface
 338  */
 339 static void ata_output_data(ide_drive_t *drive, struct request *rq,
 340                             void *buf, unsigned int len)
 341 {
 342         ide_hwif_t *hwif = drive->hwif;
 343         struct ide_io_ports *io_ports = &hwif->io_ports;
 344         unsigned long data_addr = io_ports->data_addr;
 345         u8 io_32bit = drive->io_32bit;
 346         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 347
 348         if (io_32bit) {
 349                 unsigned long uninitialized_var(flags);
 350
 351                 if ((io_32bit & 2) && !mmio) {
 352                         local_irq_save(flags);
 353                         ata_vlb_sync(io_ports->nsect_addr);
 354                 }
 355
 356                 if (mmio)
 357                         __ide_mm_outsl((void __iomem *)data_addr, buf, len / 4);
 358                 else
 359                         outsl(data_addr, buf, len / 4);
 360
 361                 if ((io_32bit & 2) && !mmio)
 362                         local_irq_restore(flags);
 363
 364                 if ((len & 3) >= 2) {
 365                         if (mmio)
 366                                 __ide_mm_outsw((void __iomem *)data_addr,
 367                                                  (u8 *)buf + (len & ~3), 1);
 368                         else
 369                                 outsw(data_addr, (u8 *)buf + (len & ~3), 1);
 370                 }
 371         } else {
 372                 if (mmio)
 373                         __ide_mm_outsw((void __iomem *)data_addr, buf, len / 2);
 374                 else
 375                         outsw(data_addr, buf, len / 2);
 376         }
 377 }
 378
 379 void default_hwif_transport(ide_hwif_t *hwif)
 380 {
 381         hwif->exec_command        = ide_exec_command;
 382         hwif->read_status         = ide_read_status;
 383         hwif->read_altstatus      = ide_read_altstatus;
 384         hwif->read_sff_dma_status = ide_read_sff_dma_status;
 385
 386         hwif->set_irq     = ide_set_irq;
 387
 388         hwif->tf_load     = ide_tf_load;
 389         hwif->tf_read     = ide_tf_read;
 390
 391         hwif->input_data  = ata_input_data;
 392         hwif->output_data = ata_output_data;
 393 }
 394
 395 u8 ide_read_error(ide_drive_t *drive)
 396 {
 397         ide_task_t task;
 398
 399         memset(&task, 0, sizeof(task));
 400         task.tf_flags = IDE_TFLAG_IN_FEATURE;
 401
 402         drive->hwif->tf_read(drive, &task);
 403
 404         return task.tf.error;
 405 }
 406 EXPORT_SYMBOL_GPL(ide_read_error);
 407
 408 void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
 409 {
 410         ide_task_t task;
 411
 412         memset(&task, 0, sizeof(task));
 413         task.tf_flags = IDE_TFLAG_IN_LBAH | IDE_TFLAG_IN_LBAM |
 414                         IDE_TFLAG_IN_NSECT;
 415
 416         drive->hwif->tf_read(drive, &task);
 417
 418         *bcount = (task.tf.lbah << 8) | task.tf.lbam;
 419         *ireason = task.tf.nsect & 3;
 420 }
 421 EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason);
 422
 423 void ide_fix_driveid (struct hd_driveid *id)
 424 {
 425 #ifndef __LITTLE_ENDIAN
 426 # ifdef __BIG_ENDIAN
 427         int i;
 428         u16 *stringcast;
 429
 430         id->config         = __le16_to_cpu(id->config);
 431         id->cyls           = __le16_to_cpu(id->cyls);
 432         id->reserved2      = __le16_to_cpu(id->reserved2);
 433         id->heads          = __le16_to_cpu(id->heads);
 434         id->track_bytes    = __le16_to_cpu(id->track_bytes);
 435         id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
 436         id->sectors        = __le16_to_cpu(id->sectors);
 437         id->vendor0        = __le16_to_cpu(id->vendor0);
 438         id->vendor1        = __le16_to_cpu(id->vendor1);
 439         id->vendor2        = __le16_to_cpu(id->vendor2);
 440         stringcast = (u16 *)&id->serial_no[0];
 441         for (i = 0; i < (20/2); i++)
 442                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 443         id->buf_type       = __le16_to_cpu(id->buf_type);
 444         id->buf_size       = __le16_to_cpu(id->buf_size);
 445         id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
 446         stringcast = (u16 *)&id->fw_rev[0];
 447         for (i = 0; i < (8/2); i++)
 448                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 449         stringcast = (u16 *)&id->model[0];
 450         for (i = 0; i < (40/2); i++)
 451                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 452         id->dword_io       = __le16_to_cpu(id->dword_io);
 453         id->reserved50     = __le16_to_cpu(id->reserved50);
 454         id->field_valid    = __le16_to_cpu(id->field_valid);
 455         id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
 456         id->cur_heads      = __le16_to_cpu(id->cur_heads);
 457         id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
 458         id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
 459         id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
 460         id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
 461         id->dma_1word      = __le16_to_cpu(id->dma_1word);
 462         id->dma_mword      = __le16_to_cpu(id->dma_mword);
 463         id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
 464         id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
 465         id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
 466         id->eide_pio       = __le16_to_cpu(id->eide_pio);
 467         id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
 468         for (i = 0; i < 2; ++i)
 469                 id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
 470         for (i = 0; i < 4; ++i)
 471                 id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
 472         id->queue_depth    = __le16_to_cpu(id->queue_depth);
 473         for (i = 0; i < 4; ++i)
 474                 id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
 475         id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
 476         id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
 477         id->command_set_1  = __le16_to_cpu(id->command_set_1);
 478         id->command_set_2  = __le16_to_cpu(id->command_set_2);
 479         id->cfsse          = __le16_to_cpu(id->cfsse);
 480         id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
 481         id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
 482         id->csf_default    = __le16_to_cpu(id->csf_default);
 483         id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
 484         id->trseuc         = __le16_to_cpu(id->trseuc);
 485         id->trsEuc         = __le16_to_cpu(id->trsEuc);
 486         id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
 487         id->mprc           = __le16_to_cpu(id->mprc);
 488         id->hw_config      = __le16_to_cpu(id->hw_config);
 489         id->acoustic       = __le16_to_cpu(id->acoustic);
 490         id->msrqs          = __le16_to_cpu(id->msrqs);
 491         id->sxfert         = __le16_to_cpu(id->sxfert);
 492         id->sal            = __le16_to_cpu(id->sal);
 493         id->spg            = __le32_to_cpu(id->spg);
 494         id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
 495         for (i = 0; i < 22; i++)
 496                 id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
 497         id->last_lun       = __le16_to_cpu(id->last_lun);
 498         id->word127        = __le16_to_cpu(id->word127);
 499         id->dlf            = __le16_to_cpu(id->dlf);
 500         id->csfo           = __le16_to_cpu(id->csfo);
 501         for (i = 0; i < 26; i++)
 502                 id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
 503         id->word156        = __le16_to_cpu(id->word156);
 504         for (i = 0; i < 3; i++)
 505                 id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
 506         id->cfa_power      = __le16_to_cpu(id->cfa_power);
 507         for (i = 0; i < 14; i++)
 508                 id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
 509         for (i = 0; i < 31; i++)
 510                 id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
 511         for (i = 0; i < 48; i++)
 512                 id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
 513         id->integrity_word  = __le16_to_cpu(id->integrity_word);
 514 # else
 515 #  error "Please fix <asm/byteorder.h>"
 516 # endif
 517 #endif
 518 }
 519
 520 /*
 521  * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
 522  * removing leading/trailing blanks and compressing internal blanks.
 523  * It is primarily used to tidy up the model name/number fields as
 524  * returned by the WIN_[P]IDENTIFY commands.
 525  */
 526
 527 void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
 528 {
 529         u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
 530
 531         if (byteswap) {
 532                 /* convert from big-endian to host byte order */
 533                 for (p = end ; p != s;) {
 534                         unsigned short *pp = (unsigned short *) (p -= 2);
 535                         *pp = ntohs(*pp);
 536                 }
 537         }
 538         /* strip leading blanks */
 539         while (s != end && *s == ' ')
 540                 ++s;
 541         /* compress internal blanks and strip trailing blanks */
 542         while (s != end && *s) {
 543                 if (*s++ != ' ' || (s != end && *s && *s != ' '))
 544                         *p++ = *(s-1);
 545         }
 546         /* wipe out trailing garbage */
 547         while (p != end)
 548                 *p++ = '\0';
 549 }
 550
 551 EXPORT_SYMBOL(ide_fixstring);
 552
 553 /*
 554  * Needed for PCI irq sharing
 555  */
 556 int drive_is_ready (ide_drive_t *drive)
 557 {
 558         ide_hwif_t *hwif        = HWIF(drive);
 559         u8 stat                 = 0;
 560
 561         if (drive->waiting_for_dma)
 562                 return hwif->dma_ops->dma_test_irq(drive);
 563
 564 #if 0
 565         /* need to guarantee 400ns since last command was issued */
 566         udelay(1);
 567 #endif
 568
 569         /*
 570          * We do a passive status test under shared PCI interrupts on
 571          * cards that truly share the ATA side interrupt, but may also share
 572          * an interrupt with another pci card/device.  We make no assumptions
 573          * about possible isa-pnp and pci-pnp issues yet.
 574          */
 575         if (hwif->io_ports.ctl_addr)
 576                 stat = hwif->read_altstatus(hwif);
 577         else
 578                 /* Note: this may clear a pending IRQ!! */
 579                 stat = hwif->read_status(hwif);
 580
 581         if (stat & BUSY_STAT)
 582                 /* drive busy:  definitely not interrupting */
 583                 return 0;
 584
 585         /* drive ready: *might* be interrupting */
 586         return 1;
 587 }
 588
 589 EXPORT_SYMBOL(drive_is_ready);
 590
 591 /*
 592  * This routine busy-waits for the drive status to be not "busy".
 593  * It then checks the status for all of the "good" bits and none
 594  * of the "bad" bits, and if all is okay it returns 0.  All other
 595  * cases return error -- caller may then invoke ide_error().
 596  *
 597  * This routine should get fixed to not hog the cpu during extra long waits..
 598  * That could be done by busy-waiting for the first jiffy or two, and then
 599  * setting a timer to wake up at half second intervals thereafter,
 600  * until timeout is achieved, before timing out.
 601  */
 602 static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout, u8 *rstat)
 603 {
 604         ide_hwif_t *hwif = drive->hwif;
 605         unsigned long flags;
 606         int i;
 607         u8 stat;
 608
 609         udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
 610         stat = hwif->read_status(hwif);
 611
 612         if (stat & BUSY_STAT) {
 613                 local_irq_set(flags);
 614                 timeout += jiffies;
 615                 while ((stat = hwif->read_status(hwif)) & BUSY_STAT) {
 616                         if (time_after(jiffies, timeout)) {
 617                                 /*
 618                                  * One last read after the timeout in case
 619                                  * heavy interrupt load made us not make any
 620                                  * progress during the timeout..
 621                                  */
 622                                 stat = hwif->read_status(hwif);
 623                                 if (!(stat & BUSY_STAT))
 624                                         break;
 625
 626                                 local_irq_restore(flags);
 627                                 *rstat = stat;
 628                                 return -EBUSY;
 629                         }
 630                 }
 631                 local_irq_restore(flags);
 632         }
 633         /*
 634          * Allow status to settle, then read it again.
 635          * A few rare drives vastly violate the 400ns spec here,
 636          * so we'll wait up to 10usec for a "good" status
 637          * rather than expensively fail things immediately.
 638          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 639          */
 640         for (i = 0; i < 10; i++) {
 641                 udelay(1);
 642                 stat = hwif->read_status(hwif);
 643
 644                 if (OK_STAT(stat, good, bad)) {
 645                         *rstat = stat;
 646                         return 0;
 647                 }
 648         }
 649         *rstat = stat;
 650         return -EFAULT;
 651 }
 652
 653 /*
 654  * In case of error returns error value after doing "*startstop = ide_error()".
 655  * The caller should return the updated value of "startstop" in this case,
 656  * "startstop" is unchanged when the function returns 0.
 657  */
 658 int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
 659 {
 660         int err;
 661         u8 stat;
 662
 663         /* bail early if we've exceeded max_failures */
 664         if (drive->max_failures && (drive->failures > drive->max_failures)) {
 665                 *startstop = ide_stopped;
 666                 return 1;
 667         }
 668
 669         err = __ide_wait_stat(drive, good, bad, timeout, &stat);
 670
 671         if (err) {
 672                 char *s = (err == -EBUSY) ? "status timeout" : "status error";
 673                 *startstop = ide_error(drive, s, stat);
 674         }
 675
 676         return err;
 677 }
 678
 679 EXPORT_SYMBOL(ide_wait_stat);
 680
 681 /**
 682  *      ide_in_drive_list       -       look for drive in black/white list
 683  *      @id: drive identifier
 684  *      @drive_table: list to inspect
 685  *
 686  *      Look for a drive in the blacklist and the whitelist tables
 687  *      Returns 1 if the drive is found in the table.
 688  */
 689
 690 int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
 691 {
 692         for ( ; drive_table->id_model; drive_table++)
 693                 if ((!strcmp(drive_table->id_model, id->model)) &&
 694                     (!drive_table->id_firmware ||
 695                      strstr(id->fw_rev, drive_table->id_firmware)))
 696                         return 1;
 697         return 0;
 698 }
 699
 700 EXPORT_SYMBOL_GPL(ide_in_drive_list);
 701
 702 /*
 703  * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
 704  * We list them here and depend on the device side cable detection for them.
 705  *
 706  * Some optical devices with the buggy firmwares have the same problem.
 707  */
 708 static const struct drive_list_entry ivb_list[] = {
 709         { "QUANTUM FIREBALLlct10 05"    , "A03.0900"    },
 710         { "TSSTcorp CDDVDW SH-S202J"    , "SB00"        },
 711         { "TSSTcorp CDDVDW SH-S202J"    , "SB01"        },
 712         { "TSSTcorp CDDVDW SH-S202N"    , "SB00"        },
 713         { "TSSTcorp CDDVDW SH-S202N"    , "SB01"        },
 714         { "TSSTcorp CDDVDW SH-S202H"    , "SB00"        },
 715         { "TSSTcorp CDDVDW SH-S202H"    , "SB01"        },
 716         { NULL                          , NULL          }
 717 };
 718
 719 /*
 720  *  All hosts that use the 80c ribbon must use!
 721  *  The name is derived from upper byte of word 93 and the 80c ribbon.
 722  */
 723 u8 eighty_ninty_three (ide_drive_t *drive)
 724 {
 725         ide_hwif_t *hwif = drive->hwif;
 726         struct hd_driveid *id = drive->id;
 727         int ivb = ide_in_drive_list(id, ivb_list);
 728
 729         if (hwif->cbl == ATA_CBL_PATA40_SHORT)
 730                 return 1;
 731
 732         if (ivb)
 733                 printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
 734                                   drive->name);
 735
 736         if (ide_dev_is_sata(id) && !ivb)
 737                 return 1;
 738
 739         if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
 740                 goto no_80w;
 741
 742         /*
 743          * FIXME:
 744          * - change master/slave IDENTIFY order
 745          * - force bit13 (80c cable present) check also for !ivb devices
 746          *   (unless the slave device is pre-ATA3)
 747          */
 748         if ((id->hw_config & 0x4000) || (ivb && (id->hw_config & 0x2000)))
 749                 return 1;
 750
 751 no_80w:
 752         if (drive->udma33_warned == 1)
 753                 return 0;
 754
 755         printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
 756                             "limiting max speed to UDMA33\n",
 757                             drive->name,
 758                             hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
 759
 760         drive->udma33_warned = 1;
 761
 762         return 0;
 763 }
 764
 765 int ide_driveid_update(ide_drive_t *drive)
 766 {
 767         ide_hwif_t *hwif = drive->hwif;
 768         struct hd_driveid *id;
 769         unsigned long timeout, flags;
 770         u8 stat;
 771
 772         /*
 773          * Re-read drive->id for possible DMA mode
 774          * change (copied from ide-probe.c)
 775          */
 776
 777         SELECT_MASK(drive, 1);
 778         hwif->set_irq(hwif, 0);
 779         msleep(50);
 780         hwif->exec_command(hwif, WIN_IDENTIFY);
 781         timeout = jiffies + WAIT_WORSTCASE;
 782         do {
 783                 if (time_after(jiffies, timeout)) {
 784                         SELECT_MASK(drive, 0);
 785                         return 0;       /* drive timed-out */
 786                 }
 787
 788                 msleep(50);     /* give drive a breather */
 789                 stat = hwif->read_altstatus(hwif);
 790         } while (stat & BUSY_STAT);
 791
 792         msleep(50);     /* wait for IRQ and DRQ_STAT */
 793         stat = hwif->read_status(hwif);
 794
 795         if (!OK_STAT(stat, DRQ_STAT, BAD_R_STAT)) {
 796                 SELECT_MASK(drive, 0);
 797                 printk("%s: CHECK for good STATUS\n", drive->name);
 798                 return 0;
 799         }
 800         local_irq_save(flags);
 801         SELECT_MASK(drive, 0);
 802         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 803         if (!id) {
 804                 local_irq_restore(flags);
 805                 return 0;
 806         }
 807         hwif->input_data(drive, NULL, id, SECTOR_SIZE);
 808         (void)hwif->read_status(hwif);  /* clear drive IRQ */
 809         local_irq_enable();
 810         local_irq_restore(flags);
 811         ide_fix_driveid(id);
 812         if (id) {
 813                 drive->id->dma_ultra = id->dma_ultra;
 814                 drive->id->dma_mword = id->dma_mword;
 815                 drive->id->dma_1word = id->dma_1word;
 816                 /* anything more ? */
 817                 kfree(id);
 818
 819                 if (drive->using_dma && ide_id_dma_bug(drive))
 820                         ide_dma_off(drive);
 821         }
 822
 823         return 1;
 824 }
 825
 826 int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 827 {
 828         ide_hwif_t *hwif = drive->hwif;
 829         int error = 0;
 830         u8 stat;
 831         ide_task_t task;
 832
 833 #ifdef CONFIG_BLK_DEV_IDEDMA
 834         if (hwif->dma_ops)      /* check if host supports DMA */
 835                 hwif->dma_ops->dma_host_set(drive, 0);
 836 #endif
 837
 838         /* Skip setting PIO flow-control modes on pre-EIDE drives */
 839         if ((speed & 0xf8) == XFER_PIO_0 && !(drive->id->capability & 0x08))
 840                 goto skip;
 841
 842         /*
 843          * Don't use ide_wait_cmd here - it will
 844          * attempt to set_geometry and recalibrate,
 845          * but for some reason these don't work at
 846          * this point (lost interrupt).
 847          */
 848         /*
 849          * Select the drive, and issue the SETFEATURES command
 850          */
 851         disable_irq_nosync(hwif->irq);
 852
 853         /*
 854          *      FIXME: we race against the running IRQ here if
 855          *      this is called from non IRQ context. If we use
 856          *      disable_irq() we hang on the error path. Work
 857          *      is needed.
 858          */
 859
 860         udelay(1);
 861         SELECT_DRIVE(drive);
 862         SELECT_MASK(drive, 0);
 863         udelay(1);
 864         hwif->set_irq(hwif, 0);
 865
 866         memset(&task, 0, sizeof(task));
 867         task.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT;
 868         task.tf.feature = SETFEATURES_XFER;
 869         task.tf.nsect   = speed;
 870
 871         hwif->tf_load(drive, &task);
 872
 873         hwif->exec_command(hwif, WIN_SETFEATURES);
 874
 875         if (drive->quirk_list == 2)
 876                 hwif->set_irq(hwif, 1);
 877
 878         error = __ide_wait_stat(drive, drive->ready_stat,
 879                                 BUSY_STAT|DRQ_STAT|ERR_STAT,
 880                                 WAIT_CMD, &stat);
 881
 882         SELECT_MASK(drive, 0);
 883
 884         enable_irq(hwif->irq);
 885
 886         if (error) {
 887                 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
 888                 return error;
 889         }
 890
 891         drive->id->dma_ultra &= ~0xFF00;
 892         drive->id->dma_mword &= ~0x0F00;
 893         drive->id->dma_1word &= ~0x0F00;
 894
 895  skip:
 896 #ifdef CONFIG_BLK_DEV_IDEDMA
 897         if ((speed >= XFER_SW_DMA_0 || (hwif->host_flags & IDE_HFLAG_VDMA)) &&
 898             drive->using_dma)
 899                 hwif->dma_ops->dma_host_set(drive, 1);
 900         else if (hwif->dma_ops) /* check if host supports DMA */
 901                 ide_dma_off_quietly(drive);
 902 #endif
 903
 904         switch(speed) {
 905                 case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
 906                 case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
 907                 case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
 908                 case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
 909                 case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
 910                 case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
 911                 case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
 912                 case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
 913                 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
 914                 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
 915                 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
 916                 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
 917                 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
 918                 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
 919                 default: break;
 920         }
 921         if (!drive->init_speed)
 922                 drive->init_speed = speed;
 923         drive->current_speed = speed;
 924         return error;
 925 }
 926
 927 /*
 928  * This should get invoked any time we exit the driver to
 929  * wait for an interrupt response from a drive.  handler() points
 930  * at the appropriate code to handle the next interrupt, and a
 931  * timer is started to prevent us from waiting forever in case
 932  * something goes wrong (see the ide_timer_expiry() handler later on).
 933  *
 934  * See also ide_execute_command
 935  */
 936 static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 937                       unsigned int timeout, ide_expiry_t *expiry)
 938 {
 939         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 940
 941         BUG_ON(hwgroup->handler);
 942         hwgroup->handler        = handler;
 943         hwgroup->expiry         = expiry;
 944         hwgroup->timer.expires  = jiffies + timeout;
 945         hwgroup->req_gen_timer  = hwgroup->req_gen;
 946         add_timer(&hwgroup->timer);
 947 }
 948
 949 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 950                       unsigned int timeout, ide_expiry_t *expiry)
 951 {
 952         unsigned long flags;
 953         spin_lock_irqsave(&ide_lock, flags);
 954         __ide_set_handler(drive, handler, timeout, expiry);
 955         spin_unlock_irqrestore(&ide_lock, flags);
 956 }
 957
 958 EXPORT_SYMBOL(ide_set_handler);
 959
 960 /**
 961  *      ide_execute_command     -       execute an IDE command
 962  *      @drive: IDE drive to issue the command against
 963  *      @command: command byte to write
 964  *      @handler: handler for next phase
 965  *      @timeout: timeout for command
 966  *      @expiry:  handler to run on timeout
 967  *
 968  *      Helper function to issue an IDE command. This handles the
 969  *      atomicity requirements, command timing and ensures that the
 970  *      handler and IRQ setup do not race. All IDE command kick off
 971  *      should go via this function or do equivalent locking.
 972  */
 973
 974 void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler,
 975                          unsigned timeout, ide_expiry_t *expiry)
 976 {
 977         unsigned long flags;
 978         ide_hwif_t *hwif = HWIF(drive);
 979
 980         spin_lock_irqsave(&ide_lock, flags);
 981         __ide_set_handler(drive, handler, timeout, expiry);
 982         hwif->exec_command(hwif, cmd);
 983         /*
 984          * Drive takes 400nS to respond, we must avoid the IRQ being
 985          * serviced before that.
 986          *
 987          * FIXME: we could skip this delay with care on non shared devices
 988          */
 989         ndelay(400);
 990         spin_unlock_irqrestore(&ide_lock, flags);
 991 }
 992 EXPORT_SYMBOL(ide_execute_command);
 993
 994 void ide_execute_pkt_cmd(ide_drive_t *drive)
 995 {
 996         ide_hwif_t *hwif = drive->hwif;
 997         unsigned long flags;
 998
 999         spin_lock_irqsave(&ide_lock, flags);
1000         hwif->exec_command(hwif, WIN_PACKETCMD);
1001         ndelay(400);
1002         spin_unlock_irqrestore(&ide_lock, flags);
1003 }
1004 EXPORT_SYMBOL_GPL(ide_execute_pkt_cmd);
1005
1006 static inline void ide_complete_drive_reset(ide_drive_t *drive, int err)
1007 {
1008         struct request *rq = drive->hwif->hwgroup->rq;
1009
1010         if (rq && blk_special_request(rq) && rq->cmd[0] == REQ_DRIVE_RESET)
1011                 ide_end_request(drive, err ? err : 1, 0);
1012 }
1013
1014 /* needed below */
1015 static ide_startstop_t do_reset1 (ide_drive_t *, int);
1016
1017 /*
1018  * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
1019  * during an atapi drive reset operation. If the drive has not yet responded,
1020  * and we have not yet hit our maximum waiting time, then the timer is restarted
1021  * for another 50ms.
1022  */
1023 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
1024 {
1025         ide_hwif_t *hwif = drive->hwif;
1026         ide_hwgroup_t *hwgroup = hwif->hwgroup;
1027         u8 stat;
1028
1029         SELECT_DRIVE(drive);
1030         udelay (10);
1031         stat = hwif->read_status(hwif);
1032
1033         if (OK_STAT(stat, 0, BUSY_STAT))
1034                 printk("%s: ATAPI reset complete\n", drive->name);
1035         else {
1036                 if (time_before(jiffies, hwgroup->poll_timeout)) {
1037                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1038                         /* continue polling */
1039                         return ide_started;
1040                 }
1041                 /* end of polling */
1042                 hwgroup->polling = 0;
1043                 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
1044                                 drive->name, stat);
1045                 /* do it the old fashioned way */
1046                 return do_reset1(drive, 1);
1047         }
1048         /* done polling */
1049         hwgroup->polling = 0;
1050         ide_complete_drive_reset(drive, 0);
1051         return ide_stopped;
1052 }
1053
1054 /*
1055  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
1056  * during an ide reset operation. If the drives have not yet responded,
1057  * and we have not yet hit our maximum waiting time, then the timer is restarted
1058  * for another 50ms.
1059  */
1060 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
1061 {
1062         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
1063         ide_hwif_t *hwif        = HWIF(drive);
1064         const struct ide_port_ops *port_ops = hwif->port_ops;
1065         u8 tmp;
1066         int err = 0;
1067
1068         if (port_ops && port_ops->reset_poll) {
1069                 err = port_ops->reset_poll(drive);
1070                 if (err) {
1071                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
1072                                 hwif->name, drive->name);
1073                         goto out;
1074                 }
1075         }
1076
1077         tmp = hwif->read_status(hwif);
1078
1079         if (!OK_STAT(tmp, 0, BUSY_STAT)) {
1080                 if (time_before(jiffies, hwgroup->poll_timeout)) {
1081                         ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1082                         /* continue polling */
1083                         return ide_started;
1084                 }
1085                 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
1086                 drive->failures++;
1087                 err = -EIO;
1088         } else  {
1089                 printk("%s: reset: ", hwif->name);
1090                 tmp = ide_read_error(drive);
1091
1092                 if (tmp == 1) {
1093                         printk("success\n");
1094                         drive->failures = 0;
1095                 } else {
1096                         drive->failures++;
1097                         printk("master: ");
1098                         switch (tmp & 0x7f) {
1099                                 case 1: printk("passed");
1100                                         break;
1101                                 case 2: printk("formatter device error");
1102                                         break;
1103                                 case 3: printk("sector buffer error");
1104                                         break;
1105                                 case 4: printk("ECC circuitry error");
1106                                         break;
1107                                 case 5: printk("controlling MPU error");
1108                                         break;
1109                                 default:printk("error (0x%02x?)", tmp);
1110                         }
1111                         if (tmp & 0x80)
1112                                 printk("; slave: failed");
1113                         printk("\n");
1114                         err = -EIO;
1115                 }
1116         }
1117 out:
1118         hwgroup->polling = 0;   /* done polling */
1119         ide_complete_drive_reset(drive, err);
1120         return ide_stopped;
1121 }
1122
1123 static void ide_disk_pre_reset(ide_drive_t *drive)
1124 {
1125         int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;
1126
1127         drive->special.all = 0;
1128         drive->special.b.set_geometry = legacy;
1129         drive->special.b.recalibrate  = legacy;
1130         drive->mult_count = 0;
1131         if (!drive->keep_settings && !drive->using_dma)
1132                 drive->mult_req = 0;
1133         if (drive->mult_req != drive->mult_count)
1134                 drive->special.b.set_multmode = 1;
1135 }
1136
1137 static void pre_reset(ide_drive_t *drive)
1138 {
1139         const struct ide_port_ops *port_ops = drive->hwif->port_ops;
1140
1141         if (drive->media == ide_disk)
1142                 ide_disk_pre_reset(drive);
1143         else
1144                 drive->post_reset = 1;
1145
1146         if (drive->using_dma) {
1147                 if (drive->crc_count)
1148                         ide_check_dma_crc(drive);
1149                 else
1150                         ide_dma_off(drive);
1151         }
1152
1153         if (!drive->keep_settings) {
1154                 if (!drive->using_dma) {
1155                         drive->unmask = 0;
1156                         drive->io_32bit = 0;
1157                 }
1158                 return;
1159         }
1160
1161         if (port_ops && port_ops->pre_reset)
1162                 port_ops->pre_reset(drive);
1163
1164         if (drive->current_speed != 0xff)
1165                 drive->desired_speed = drive->current_speed;
1166         drive->current_speed = 0xff;
1167 }
1168
1169 /*
1170  * do_reset1() attempts to recover a confused drive by resetting it.
1171  * Unfortunately, resetting a disk drive actually resets all devices on
1172  * the same interface, so it can really be thought of as resetting the
1173  * interface rather than resetting the drive.
1174  *
1175  * ATAPI devices have their own reset mechanism which allows them to be
1176  * individually reset without clobbering other devices on the same interface.
1177  *
1178  * Unfortunately, the IDE interface does not generate an interrupt to let
1179  * us know when the reset operation has finished, so we must poll for this.
1180  * Equally poor, though, is the fact that this may a very long time to complete,
1181  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
1182  * we set a timer to poll at 50ms intervals.
1183  */
1184 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
1185 {
1186         unsigned int unit;
1187         unsigned long flags;
1188         ide_hwif_t *hwif;
1189         ide_hwgroup_t *hwgroup;
1190         struct ide_io_ports *io_ports;
1191         const struct ide_port_ops *port_ops;
1192
1193         spin_lock_irqsave(&ide_lock, flags);
1194         hwif = HWIF(drive);
1195         hwgroup = HWGROUP(drive);
1196
1197         io_ports = &hwif->io_ports;
1198
1199         /* We must not reset with running handlers */
1200         BUG_ON(hwgroup->handler != NULL);
1201
1202         /* For an ATAPI device, first try an ATAPI SRST. */
1203         if (drive->media != ide_disk && !do_not_try_atapi) {
1204                 pre_reset(drive);
1205                 SELECT_DRIVE(drive);
1206                 udelay (20);
1207                 hwif->exec_command(hwif, WIN_SRST);
1208                 ndelay(400);
1209                 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1210                 hwgroup->polling = 1;
1211                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1212                 spin_unlock_irqrestore(&ide_lock, flags);
1213                 return ide_started;
1214         }
1215
1216         /*
1217          * First, reset any device state data we were maintaining
1218          * for any of the drives on this interface.
1219          */
1220         for (unit = 0; unit < MAX_DRIVES; ++unit)
1221                 pre_reset(&hwif->drives[unit]);
1222
1223         if (io_ports->ctl_addr == 0) {
1224                 spin_unlock_irqrestore(&ide_lock, flags);
1225                 ide_complete_drive_reset(drive, -ENXIO);
1226                 return ide_stopped;
1227         }
1228
1229         /*
1230          * Note that we also set nIEN while resetting the device,
1231          * to mask unwanted interrupts from the interface during the reset.
1232          * However, due to the design of PC hardware, this will cause an
1233          * immediate interrupt due to the edge transition it produces.
1234          * This single interrupt gives us a "fast poll" for drives that
1235          * recover from reset very quickly, saving us the first 50ms wait time.
1236          *
1237          * TODO: add ->softreset method and stop abusing ->set_irq
1238          */
1239         /* set SRST and nIEN */
1240         hwif->set_irq(hwif, 4);
1241         /* more than enough time */
1242         udelay(10);
1243         /* clear SRST, leave nIEN (unless device is on the quirk list) */
1244         hwif->set_irq(hwif, drive->quirk_list == 2);
1245         /* more than enough time */
1246         udelay(10);
1247         hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1248         hwgroup->polling = 1;
1249         __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1250
1251         /*
1252          * Some weird controller like resetting themselves to a strange
1253          * state when the disks are reset this way. At least, the Winbond
1254          * 553 documentation says that
1255          */
1256         port_ops = hwif->port_ops;
1257         if (port_ops && port_ops->resetproc)
1258                 port_ops->resetproc(drive);
1259
1260         spin_unlock_irqrestore(&ide_lock, flags);
1261         return ide_started;
1262 }
1263
1264 /*
1265  * ide_do_reset() is the entry point to the drive/interface reset code.
1266  */
1267
1268 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1269 {
1270         return do_reset1(drive, 0);
1271 }
1272
1273 EXPORT_SYMBOL(ide_do_reset);
1274
1275 /*
1276  * ide_wait_not_busy() waits for the currently selected device on the hwif
1277  * to report a non-busy status, see comments in ide_probe_port().
1278  */
1279 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1280 {
1281         u8 stat = 0;
1282
1283         while(timeout--) {
1284                 /*
1285                  * Turn this into a schedule() sleep once I'm sure
1286                  * about locking issues (2.5 work ?).
1287                  */
1288                 mdelay(1);
1289                 stat = hwif->read_status(hwif);
1290                 if ((stat & BUSY_STAT) == 0)
1291                         return 0;
1292                 /*
1293                  * Assume a value of 0xff means nothing is connected to
1294                  * the interface and it doesn't implement the pull-down
1295                  * resistor on D7.
1296                  */
1297                 if (stat == 0xff)
1298                         return -ENODEV;
1299                 touch_softlockup_watchdog();
1300                 touch_nmi_watchdog();
1301         }
1302         return -EBUSY;
1303 }
1304
1305 EXPORT_SYMBOL_GPL(ide_wait_not_busy);
1306