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

   1 /*
   2  * Provides ACPI support for IDE drives.
   3  *
   4  * Copyright (C) 2005 Intel Corp.
   5  * Copyright (C) 2005 Randy Dunlap
   6  * Copyright (C) 2006 SUSE Linux Products GmbH
   7  * Copyright (C) 2006 Hannes Reinecke
   8  */
   9
  10 #include <linux/ata.h>
  11 #include <linux/delay.h>
  12 #include <linux/device.h>
  13 #include <linux/errno.h>
  14 #include <linux/kernel.h>
  15 #include <acpi/acpi.h>
  16 #include <linux/ide.h>
  17 #include <linux/pci.h>
  18 #include <linux/dmi.h>
  19
  20 #include <acpi/acpi_bus.h>
  21
  22 #define REGS_PER_GTF            7
  23 struct taskfile_array {
  24         u8      tfa[REGS_PER_GTF];      /* regs. 0x1f1 - 0x1f7 */
  25 };
  26
  27 struct GTM_buffer {
  28         u32     PIO_speed0;
  29         u32     DMA_speed0;
  30         u32     PIO_speed1;
  31         u32     DMA_speed1;
  32         u32     GTM_flags;
  33 };
  34
  35 struct ide_acpi_drive_link {
  36         acpi_handle      obj_handle;
  37         u8               idbuff[512];
  38 };
  39
  40 struct ide_acpi_hwif_link {
  41         ide_hwif_t                      *hwif;
  42         acpi_handle                      obj_handle;
  43         struct GTM_buffer                gtm;
  44         struct ide_acpi_drive_link       master;
  45         struct ide_acpi_drive_link       slave;
  46 };
  47
  48 #undef DEBUGGING
  49 /* note: adds function name and KERN_DEBUG */
  50 #ifdef DEBUGGING
  51 #define DEBPRINT(fmt, args...)  \
  52                 printk(KERN_DEBUG "%s: " fmt, __func__, ## args)
  53 #else
  54 #define DEBPRINT(fmt, args...)  do {} while (0)
  55 #endif  /* DEBUGGING */
  56
  57 static int ide_noacpi;
  58 module_param_named(noacpi, ide_noacpi, bool, 0);
  59 MODULE_PARM_DESC(noacpi, "disable IDE ACPI support");
  60
  61 static int ide_acpigtf;
  62 module_param_named(acpigtf, ide_acpigtf, bool, 0);
  63 MODULE_PARM_DESC(acpigtf, "enable IDE ACPI _GTF support");
  64
  65 static int ide_acpionboot;
  66 module_param_named(acpionboot, ide_acpionboot, bool, 0);
  67 MODULE_PARM_DESC(acpionboot, "call IDE ACPI methods on boot");
  68
  69 static bool ide_noacpi_psx;
  70 static int no_acpi_psx(const struct dmi_system_id *id)
  71 {
  72         ide_noacpi_psx = true;
  73         printk(KERN_NOTICE"%s detected - disable ACPI _PSx.\n", id->ident);
  74         return 0;
  75 }
  76
  77 static const struct dmi_system_id ide_acpi_dmi_table[] = {
  78         /* Bug 9673. */
  79         /* We should check if this is because ACPI NVS isn't save/restored. */
  80         {
  81                 .callback = no_acpi_psx,
  82                 .ident    = "HP nx9005",
  83                 .matches  = {
  84                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies Ltd."),
  85                         DMI_MATCH(DMI_BIOS_VERSION, "KAM1.60")
  86                 },
  87         },
  88
  89         { }     /* terminate list */
  90 };
  91
  92 static int ide_acpi_blacklist(void)
  93 {
  94         static int done;
  95         if (done)
  96                 return 0;
  97         done = 1;
  98         dmi_check_system(ide_acpi_dmi_table);
  99         return 0;
 100 }
 101
 102 /**
 103  * ide_get_dev_handle - finds acpi_handle and PCI device.function
 104  * @dev: device to locate
 105  * @handle: returned acpi_handle for @dev
 106  * @pcidevfn: return PCI device.func for @dev
 107  *
 108  * Returns the ACPI object handle to the corresponding PCI device.
 109  *
 110  * Returns 0 on success, <0 on error.
 111  */
 112 static int ide_get_dev_handle(struct device *dev, acpi_handle *handle,
 113                                acpi_integer *pcidevfn)
 114 {
 115         struct pci_dev *pdev = to_pci_dev(dev);
 116         unsigned int bus, devnum, func;
 117         acpi_integer addr;
 118         acpi_handle dev_handle;
 119         struct acpi_buffer buffer = {.length = ACPI_ALLOCATE_BUFFER,
 120                                         .pointer = NULL};
 121         acpi_status status;
 122         struct acpi_device_info *dinfo = NULL;
 123         int ret = -ENODEV;
 124
 125         bus = pdev->bus->number;
 126         devnum = PCI_SLOT(pdev->devfn);
 127         func = PCI_FUNC(pdev->devfn);
 128         /* ACPI _ADR encoding for PCI bus: */
 129         addr = (acpi_integer)(devnum << 16 | func);
 130
 131         DEBPRINT("ENTER: pci %02x:%02x.%01x\n", bus, devnum, func);
 132
 133         dev_handle = DEVICE_ACPI_HANDLE(dev);
 134         if (!dev_handle) {
 135                 DEBPRINT("no acpi handle for device\n");
 136                 goto err;
 137         }
 138
 139         status = acpi_get_object_info(dev_handle, &buffer);
 140         if (ACPI_FAILURE(status)) {
 141                 DEBPRINT("get_object_info for device failed\n");
 142                 goto err;
 143         }
 144         dinfo = buffer.pointer;
 145         if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
 146             dinfo->address == addr) {
 147                 *pcidevfn = addr;
 148                 *handle = dev_handle;
 149         } else {
 150                 DEBPRINT("get_object_info for device has wrong "
 151                         " address: %llu, should be %u\n",
 152                         dinfo ? (unsigned long long)dinfo->address : -1ULL,
 153                         (unsigned int)addr);
 154                 goto err;
 155         }
 156
 157         DEBPRINT("for dev=0x%x.%x, addr=0x%llx, *handle=0x%p\n",
 158                  devnum, func, (unsigned long long)addr, *handle);
 159         ret = 0;
 160 err:
 161         kfree(dinfo);
 162         return ret;
 163 }
 164
 165 /**
 166  * ide_acpi_hwif_get_handle - Get ACPI object handle for a given hwif
 167  * @hwif: device to locate
 168  *
 169  * Retrieves the object handle for a given hwif.
 170  *
 171  * Returns handle on success, 0 on error.
 172  */
 173 static acpi_handle ide_acpi_hwif_get_handle(ide_hwif_t *hwif)
 174 {
 175         struct device           *dev = hwif->gendev.parent;
 176         acpi_handle             uninitialized_var(dev_handle);
 177         acpi_integer            pcidevfn;
 178         acpi_handle             chan_handle;
 179         int                     err;
 180
 181         DEBPRINT("ENTER: device %s\n", hwif->name);
 182
 183         if (!dev) {
 184                 DEBPRINT("no PCI device for %s\n", hwif->name);
 185                 return NULL;
 186         }
 187
 188         err = ide_get_dev_handle(dev, &dev_handle, &pcidevfn);
 189         if (err < 0) {
 190                 DEBPRINT("ide_get_dev_handle failed (%d)\n", err);
 191                 return NULL;
 192         }
 193
 194         /* get child objects of dev_handle == channel objects,
 195          * + _their_ children == drive objects */
 196         /* channel is hwif->channel */
 197         chan_handle = acpi_get_child(dev_handle, hwif->channel);
 198         DEBPRINT("chan adr=%d: handle=0x%p\n",
 199                  hwif->channel, chan_handle);
 200
 201         return chan_handle;
 202 }
 203
 204 /**
 205  * ide_acpi_drive_get_handle - Get ACPI object handle for a given drive
 206  * @drive: device to locate
 207  *
 208  * Retrieves the object handle of a given drive. According to the ACPI
 209  * spec the drive is a child of the hwif.
 210  *
 211  * Returns handle on success, 0 on error.
 212  */
 213 static acpi_handle ide_acpi_drive_get_handle(ide_drive_t *drive)
 214 {
 215         ide_hwif_t      *hwif = drive->hwif;
 216         int              port;
 217         acpi_handle      drive_handle;
 218
 219         if (!hwif->acpidata)
 220                 return NULL;
 221
 222         if (!hwif->acpidata->obj_handle)
 223                 return NULL;
 224
 225         port = hwif->channel ? drive->dn - 2: drive->dn;
 226
 227         DEBPRINT("ENTER: %s at channel#: %d port#: %d\n",
 228                  drive->name, hwif->channel, port);
 229
 230
 231         /* TBD: could also check ACPI object VALID bits */
 232         drive_handle = acpi_get_child(hwif->acpidata->obj_handle, port);
 233         DEBPRINT("drive %s handle 0x%p\n", drive->name, drive_handle);
 234
 235         return drive_handle;
 236 }
 237
 238 /**
 239  * do_drive_get_GTF - get the drive bootup default taskfile settings
 240  * @drive: the drive for which the taskfile settings should be retrieved
 241  * @gtf_length: number of bytes of _GTF data returned at @gtf_address
 242  * @gtf_address: buffer containing _GTF taskfile arrays
 243  *
 244  * The _GTF method has no input parameters.
 245  * It returns a variable number of register set values (registers
 246  * hex 1F1..1F7, taskfiles).
 247  * The <variable number> is not known in advance, so have ACPI-CA
 248  * allocate the buffer as needed and return it, then free it later.
 249  *
 250  * The returned @gtf_length and @gtf_address are only valid if the
 251  * function return value is 0.
 252  */
 253 static int do_drive_get_GTF(ide_drive_t *drive,
 254                      unsigned int *gtf_length, unsigned long *gtf_address,
 255                      unsigned long *obj_loc)
 256 {
 257         acpi_status                     status;
 258         struct acpi_buffer              output;
 259         union acpi_object               *out_obj;
 260         ide_hwif_t                      *hwif = drive->hwif;
 261         struct device                   *dev = hwif->gendev.parent;
 262         int                             err = -ENODEV;
 263         int                             port;
 264
 265         *gtf_length = 0;
 266         *gtf_address = 0UL;
 267         *obj_loc = 0UL;
 268
 269         if (ide_noacpi)
 270                 return 0;
 271
 272         if (!dev) {
 273                 DEBPRINT("no PCI device for %s\n", hwif->name);
 274                 goto out;
 275         }
 276
 277         if (!hwif->acpidata) {
 278                 DEBPRINT("no ACPI data for %s\n", hwif->name);
 279                 goto out;
 280         }
 281
 282         port = hwif->channel ? drive->dn - 2: drive->dn;
 283
 284         DEBPRINT("ENTER: %s at %s, port#: %d, hard_port#: %d\n",
 285                  hwif->name, dev->bus_id, port, hwif->channel);
 286
 287         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0) {
 288                 DEBPRINT("%s drive %d:%d not present\n",
 289                          hwif->name, hwif->channel, port);
 290                 goto out;
 291         }
 292
 293         /* Get this drive's _ADR info. if not already known. */
 294         if (!drive->acpidata->obj_handle) {
 295                 drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive);
 296                 if (!drive->acpidata->obj_handle) {
 297                         DEBPRINT("No ACPI object found for %s\n",
 298                                  drive->name);
 299                         goto out;
 300                 }
 301         }
 302
 303         /* Setting up output buffer */
 304         output.length = ACPI_ALLOCATE_BUFFER;
 305         output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
 306
 307         /* _GTF has no input parameters */
 308         err = -EIO;
 309         status = acpi_evaluate_object(drive->acpidata->obj_handle, "_GTF",
 310                                       NULL, &output);
 311         if (ACPI_FAILURE(status)) {
 312                 printk(KERN_DEBUG
 313                        "%s: Run _GTF error: status = 0x%x\n",
 314                        __func__, status);
 315                 goto out;
 316         }
 317
 318         if (!output.length || !output.pointer) {
 319                 DEBPRINT("Run _GTF: "
 320                        "length or ptr is NULL (0x%llx, 0x%p)\n",
 321                        (unsigned long long)output.length,
 322                        output.pointer);
 323                 goto out;
 324         }
 325
 326         out_obj = output.pointer;
 327         if (out_obj->type != ACPI_TYPE_BUFFER) {
 328                 DEBPRINT("Run _GTF: error: "
 329                        "expected object type of ACPI_TYPE_BUFFER, "
 330                        "got 0x%x\n", out_obj->type);
 331                 err = -ENOENT;
 332                 kfree(output.pointer);
 333                 goto out;
 334         }
 335
 336         if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
 337             out_obj->buffer.length % REGS_PER_GTF) {
 338                 printk(KERN_ERR
 339                        "%s: unexpected GTF length (%d) or addr (0x%p)\n",
 340                        __func__, out_obj->buffer.length,
 341                        out_obj->buffer.pointer);
 342                 err = -ENOENT;
 343                 kfree(output.pointer);
 344                 goto out;
 345         }
 346
 347         *gtf_length = out_obj->buffer.length;
 348         *gtf_address = (unsigned long)out_obj->buffer.pointer;
 349         *obj_loc = (unsigned long)out_obj;
 350         DEBPRINT("returning gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
 351                  *gtf_length, *gtf_address, *obj_loc);
 352         err = 0;
 353 out:
 354         return err;
 355 }
 356
 357 /**
 358  * taskfile_load_raw - send taskfile registers to drive
 359  * @drive: drive to which output is sent
 360  * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
 361  *
 362  * Outputs IDE taskfile to the drive.
 363  */
 364 static int taskfile_load_raw(ide_drive_t *drive,
 365                               const struct taskfile_array *gtf)
 366 {
 367         ide_task_t args;
 368         int err = 0;
 369
 370         DEBPRINT("(0x1f1-1f7): hex: "
 371                "%02x %02x %02x %02x %02x %02x %02x\n",
 372                gtf->tfa[0], gtf->tfa[1], gtf->tfa[2],
 373                gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]);
 374
 375         memset(&args, 0, sizeof(ide_task_t));
 376
 377         /* convert gtf to IDE Taskfile */
 378         memcpy(&args.tf_array[7], &gtf->tfa, 7);
 379         args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 380
 381         if (!ide_acpigtf) {
 382                 DEBPRINT("_GTF execution disabled\n");
 383                 return err;
 384         }
 385
 386         err = ide_no_data_taskfile(drive, &args);
 387         if (err)
 388                 printk(KERN_ERR "%s: ide_no_data_taskfile failed: %u\n",
 389                        __func__, err);
 390
 391         return err;
 392 }
 393
 394 /**
 395  * do_drive_set_taskfiles - write the drive taskfile settings from _GTF
 396  * @drive: the drive to which the taskfile command should be sent
 397  * @gtf_length: total number of bytes of _GTF taskfiles
 398  * @gtf_address: location of _GTF taskfile arrays
 399  *
 400  * Write {gtf_address, length gtf_length} in groups of
 401  * REGS_PER_GTF bytes.
 402  */
 403 static int do_drive_set_taskfiles(ide_drive_t *drive,
 404                                   unsigned int gtf_length,
 405                                   unsigned long gtf_address)
 406 {
 407         int                     rc = -ENODEV, err;
 408         int                     gtf_count = gtf_length / REGS_PER_GTF;
 409         int                     ix;
 410         struct taskfile_array   *gtf;
 411
 412         if (ide_noacpi)
 413                 return 0;
 414
 415         DEBPRINT("ENTER: %s, hard_port#: %d\n", drive->name, drive->dn);
 416
 417         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 418                 goto out;
 419
 420         if (!gtf_count)         /* shouldn't be here */
 421                 goto out;
 422
 423         DEBPRINT("total GTF bytes=%u (0x%x), gtf_count=%d, addr=0x%lx\n",
 424                  gtf_length, gtf_length, gtf_count, gtf_address);
 425
 426         if (gtf_length % REGS_PER_GTF) {
 427                 printk(KERN_ERR "%s: unexpected GTF length (%d)\n",
 428                        __func__, gtf_length);
 429                 goto out;
 430         }
 431
 432         rc = 0;
 433         for (ix = 0; ix < gtf_count; ix++) {
 434                 gtf = (struct taskfile_array *)
 435                         (gtf_address + ix * REGS_PER_GTF);
 436
 437                 /* send all TaskFile registers (0x1f1-0x1f7) *in*that*order* */
 438                 err = taskfile_load_raw(drive, gtf);
 439                 if (err)
 440                         rc = err;
 441         }
 442
 443 out:
 444         return rc;
 445 }
 446
 447 /**
 448  * ide_acpi_exec_tfs - get then write drive taskfile settings
 449  * @drive: the drive for which the taskfile settings should be
 450  *         written.
 451  *
 452  * According to the ACPI spec this should be called after _STM
 453  * has been evaluated for the interface. Some ACPI vendors interpret
 454  * that as a hard requirement and modify the taskfile according
 455  * to the Identify Drive information passed down with _STM.
 456  * So one should really make sure to call this only after _STM has
 457  * been executed.
 458  */
 459 int ide_acpi_exec_tfs(ide_drive_t *drive)
 460 {
 461         int             ret;
 462         unsigned int    gtf_length;
 463         unsigned long   gtf_address;
 464         unsigned long   obj_loc;
 465
 466         if (ide_noacpi)
 467                 return 0;
 468
 469         DEBPRINT("call get_GTF, drive=%s port=%d\n", drive->name, drive->dn);
 470
 471         ret = do_drive_get_GTF(drive, &gtf_length, &gtf_address, &obj_loc);
 472         if (ret < 0) {
 473                 DEBPRINT("get_GTF error (%d)\n", ret);
 474                 return ret;
 475         }
 476
 477         DEBPRINT("call set_taskfiles, drive=%s\n", drive->name);
 478
 479         ret = do_drive_set_taskfiles(drive, gtf_length, gtf_address);
 480         kfree((void *)obj_loc);
 481         if (ret < 0) {
 482                 DEBPRINT("set_taskfiles error (%d)\n", ret);
 483         }
 484
 485         DEBPRINT("ret=%d\n", ret);
 486
 487         return ret;
 488 }
 489
 490 /**
 491  * ide_acpi_get_timing - get the channel (controller) timings
 492  * @hwif: target IDE interface (channel)
 493  *
 494  * This function executes the _GTM ACPI method for the target channel.
 495  *
 496  */
 497 void ide_acpi_get_timing(ide_hwif_t *hwif)
 498 {
 499         acpi_status             status;
 500         struct acpi_buffer      output;
 501         union acpi_object       *out_obj;
 502
 503         if (ide_noacpi)
 504                 return;
 505
 506         DEBPRINT("ENTER:\n");
 507
 508         if (!hwif->acpidata) {
 509                 DEBPRINT("no ACPI data for %s\n", hwif->name);
 510                 return;
 511         }
 512
 513         /* Setting up output buffer for _GTM */
 514         output.length = ACPI_ALLOCATE_BUFFER;
 515         output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
 516
 517         /* _GTM has no input parameters */
 518         status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_GTM",
 519                                       NULL, &output);
 520
 521         DEBPRINT("_GTM status: %d, outptr: 0x%p, outlen: 0x%llx\n",
 522                  status, output.pointer,
 523                  (unsigned long long)output.length);
 524
 525         if (ACPI_FAILURE(status)) {
 526                 DEBPRINT("Run _GTM error: status = 0x%x\n", status);
 527                 return;
 528         }
 529
 530         if (!output.length || !output.pointer) {
 531                 DEBPRINT("Run _GTM: length or ptr is NULL (0x%llx, 0x%p)\n",
 532                        (unsigned long long)output.length,
 533                        output.pointer);
 534                 kfree(output.pointer);
 535                 return;
 536         }
 537
 538         out_obj = output.pointer;
 539         if (out_obj->type != ACPI_TYPE_BUFFER) {
 540                 kfree(output.pointer);
 541                 DEBPRINT("Run _GTM: error: "
 542                        "expected object type of ACPI_TYPE_BUFFER, "
 543                        "got 0x%x\n", out_obj->type);
 544                 return;
 545         }
 546
 547         if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
 548             out_obj->buffer.length != sizeof(struct GTM_buffer)) {
 549                 kfree(output.pointer);
 550                 printk(KERN_ERR
 551                         "%s: unexpected _GTM length (0x%x)[should be 0x%zx] or "
 552                         "addr (0x%p)\n",
 553                         __func__, out_obj->buffer.length,
 554                         sizeof(struct GTM_buffer), out_obj->buffer.pointer);
 555                 return;
 556         }
 557
 558         memcpy(&hwif->acpidata->gtm, out_obj->buffer.pointer,
 559                sizeof(struct GTM_buffer));
 560
 561         DEBPRINT("_GTM info: ptr: 0x%p, len: 0x%x, exp.len: 0x%Zx\n",
 562                  out_obj->buffer.pointer, out_obj->buffer.length,
 563                  sizeof(struct GTM_buffer));
 564
 565         DEBPRINT("_GTM fields: 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n",
 566                  hwif->acpidata->gtm.PIO_speed0,
 567                  hwif->acpidata->gtm.DMA_speed0,
 568                  hwif->acpidata->gtm.PIO_speed1,
 569                  hwif->acpidata->gtm.DMA_speed1,
 570                  hwif->acpidata->gtm.GTM_flags);
 571
 572         kfree(output.pointer);
 573 }
 574
 575 /**
 576  * ide_acpi_push_timing - set the channel (controller) timings
 577  * @hwif: target IDE interface (channel)
 578  *
 579  * This function executes the _STM ACPI method for the target channel.
 580  *
 581  * _STM requires Identify Drive data, which has to passed as an argument.
 582  * Unfortunately drive->id is a mangled version which we can't readily
 583  * use; hence we'll get the information afresh.
 584  */
 585 void ide_acpi_push_timing(ide_hwif_t *hwif)
 586 {
 587         acpi_status             status;
 588         struct acpi_object_list input;
 589         union acpi_object       in_params[3];
 590         struct ide_acpi_drive_link      *master = &hwif->acpidata->master;
 591         struct ide_acpi_drive_link      *slave = &hwif->acpidata->slave;
 592
 593         if (ide_noacpi)
 594                 return;
 595
 596         DEBPRINT("ENTER:\n");
 597
 598         if (!hwif->acpidata) {
 599                 DEBPRINT("no ACPI data for %s\n", hwif->name);
 600                 return;
 601         }
 602
 603         /* Give the GTM buffer + drive Identify data to the channel via the
 604          * _STM method: */
 605         /* setup input parameters buffer for _STM */
 606         input.count = 3;
 607         input.pointer = in_params;
 608         in_params[0].type = ACPI_TYPE_BUFFER;
 609         in_params[0].buffer.length = sizeof(struct GTM_buffer);
 610         in_params[0].buffer.pointer = (u8 *)&hwif->acpidata->gtm;
 611         in_params[1].type = ACPI_TYPE_BUFFER;
 612         in_params[1].buffer.length = ATA_ID_WORDS * 2;
 613         in_params[1].buffer.pointer = (u8 *)&master->idbuff;
 614         in_params[2].type = ACPI_TYPE_BUFFER;
 615         in_params[2].buffer.length = ATA_ID_WORDS * 2;
 616         in_params[2].buffer.pointer = (u8 *)&slave->idbuff;
 617         /* Output buffer: _STM has no output */
 618
 619         status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_STM",
 620                                       &input, NULL);
 621
 622         if (ACPI_FAILURE(status)) {
 623                 DEBPRINT("Run _STM error: status = 0x%x\n", status);
 624         }
 625         DEBPRINT("_STM status: %d\n", status);
 626 }
 627
 628 /**
 629  * ide_acpi_set_state - set the channel power state
 630  * @hwif: target IDE interface
 631  * @on: state, on/off
 632  *
 633  * This function executes the _PS0/_PS3 ACPI method to set the power state.
 634  * ACPI spec requires _PS0 when IDE power on and _PS3 when power off
 635  */
 636 void ide_acpi_set_state(ide_hwif_t *hwif, int on)
 637 {
 638         ide_drive_t *drive;
 639         int i;
 640
 641         if (ide_noacpi || ide_noacpi_psx)
 642                 return;
 643
 644         DEBPRINT("ENTER:\n");
 645
 646         if (!hwif->acpidata) {
 647                 DEBPRINT("no ACPI data for %s\n", hwif->name);
 648                 return;
 649         }
 650         /* channel first and then drives for power on and verse versa for power off */
 651         if (on)
 652                 acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0);
 653
 654         ide_port_for_each_dev(i, drive, hwif) {
 655                 if (!drive->acpidata->obj_handle)
 656                         drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive);
 657
 658                 if (drive->acpidata->obj_handle &&
 659                     (drive->dev_flags & IDE_DFLAG_PRESENT)) {
 660                         acpi_bus_set_power(drive->acpidata->obj_handle,
 661                                 on? ACPI_STATE_D0: ACPI_STATE_D3);
 662                 }
 663         }
 664         if (!on)
 665                 acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D3);
 666 }
 667
 668 /**
 669  * ide_acpi_init - initialize the ACPI link for an IDE interface
 670  * @hwif: target IDE interface (channel)
 671  *
 672  * The ACPI spec is not quite clear when the drive identify buffer
 673  * should be obtained. Calling IDENTIFY DEVICE during shutdown
 674  * is not the best of ideas as the drive might already being put to
 675  * sleep. And obviously we can't call it during resume.
 676  * So we get the information during startup; but this means that
 677  * any changes during run-time will be lost after resume.
 678  */
 679 void ide_acpi_init(ide_hwif_t *hwif)
 680 {
 681         ide_acpi_blacklist();
 682
 683         hwif->acpidata = kzalloc(sizeof(struct ide_acpi_hwif_link), GFP_KERNEL);
 684         if (!hwif->acpidata)
 685                 return;
 686
 687         hwif->acpidata->obj_handle = ide_acpi_hwif_get_handle(hwif);
 688         if (!hwif->acpidata->obj_handle) {
 689                 DEBPRINT("no ACPI object for %s found\n", hwif->name);
 690                 kfree(hwif->acpidata);
 691                 hwif->acpidata = NULL;
 692         }
 693 }
 694
 695 void ide_acpi_port_init_devices(ide_hwif_t *hwif)
 696 {
 697         ide_drive_t *drive;
 698         int i, err;
 699
 700         if (hwif->acpidata == NULL)
 701                 return;
 702
 703         /*
 704          * The ACPI spec mandates that we send information
 705          * for both drives, regardless whether they are connected
 706          * or not.
 707          */
 708         hwif->devices[0]->acpidata = &hwif->acpidata->master;
 709         hwif->devices[1]->acpidata = &hwif->acpidata->slave;
 710
 711         /*
 712          * Send IDENTIFY for each drive
 713          */
 714         ide_port_for_each_dev(i, drive, hwif) {
 715                 memset(drive->acpidata, 0, sizeof(*drive->acpidata));
 716
 717                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 718                         continue;
 719
 720                 err = taskfile_lib_get_identify(drive, drive->acpidata->idbuff);
 721                 if (err)
 722                         DEBPRINT("identify device %s failed (%d)\n",
 723                                  drive->name, err);
 724         }
 725
 726         if (!ide_acpionboot) {
 727                 DEBPRINT("ACPI methods disabled on boot\n");
 728                 return;
 729         }
 730
 731         /* ACPI _PS0 before _STM */
 732         ide_acpi_set_state(hwif, 1);
 733         /*
 734          * ACPI requires us to call _STM on startup
 735          */
 736         ide_acpi_get_timing(hwif);
 737         ide_acpi_push_timing(hwif);
 738
 739         ide_port_for_each_dev(i, drive, hwif) {
 740                 if (drive->dev_flags & IDE_DFLAG_PRESENT)
 741                         /* Execute ACPI startup code */
 742                         ide_acpi_exec_tfs(drive);
 743         }
 744 }