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