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, __func__, ## args)
  59 #else
  60 #define DEBPRINT(fmt, args...)  do {} while (0)
  61 #endif  /* DEBUGGING */
  62
  63 static int ide_noacpi;
  64 module_param_named(noacpi, ide_noacpi, bool, 0);
  65 MODULE_PARM_DESC(noacpi, "disable IDE ACPI support");
  66
  67 static int ide_acpigtf;
  68 module_param_named(acpigtf, ide_acpigtf, bool, 0);
  69 MODULE_PARM_DESC(acpigtf, "enable IDE ACPI _GTF support");
  70
  71 static int ide_acpionboot;
  72 module_param_named(acpionboot, ide_acpionboot, bool, 0);
  73 MODULE_PARM_DESC(acpionboot, "call IDE ACPI methods on boot");
  74
  75 static bool ide_noacpi_psx;
  76 static int no_acpi_psx(const struct dmi_system_id *id)
  77 {
  78         ide_noacpi_psx = true;
  79         printk(KERN_NOTICE"%s detected - disable ACPI _PSx.\n", id->ident);
  80         return 0;
  81 }
  82
  83 static const struct dmi_system_id ide_acpi_dmi_table[] = {
  84         /* Bug 9673. */
  85         /* We should check if this is because ACPI NVS isn't save/restored. */
  86         {
  87                 .callback = no_acpi_psx,
  88                 .ident    = "HP nx9005",
  89                 .matches  = {
  90                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies Ltd."),
  91                         DMI_MATCH(DMI_BIOS_VERSION, "KAM1.60")
  92                 },
  93         },
  94
  95         { }     /* terminate list */
  96 };
  97
  98 static int ide_acpi_blacklist(void)
  99 {
 100         static int done;
 101         if (done)
 102                 return 0;
 103         done = 1;
 104         dmi_check_system(ide_acpi_dmi_table);
 105         return 0;
 106 }
 107
 108 /**
 109  * ide_get_dev_handle - finds acpi_handle and PCI device.function
 110  * @dev: device to locate
 111  * @handle: returned acpi_handle for @dev
 112  * @pcidevfn: return PCI device.func for @dev
 113  *
 114  * Returns the ACPI object handle to the corresponding PCI device.
 115  *
 116  * Returns 0 on success, <0 on error.
 117  */
 118 static int ide_get_dev_handle(struct device *dev, acpi_handle *handle,
 119                                acpi_integer *pcidevfn)
 120 {
 121         struct pci_dev *pdev = to_pci_dev(dev);
 122         unsigned int bus, devnum, func;
 123         acpi_integer addr;
 124         acpi_handle dev_handle;
 125         struct acpi_buffer buffer = {.length = ACPI_ALLOCATE_BUFFER,
 126                                         .pointer = NULL};
 127         acpi_status status;
 128         struct acpi_device_info *dinfo = NULL;
 129         int ret = -ENODEV;
 130
 131         bus = pdev->bus->number;
 132         devnum = PCI_SLOT(pdev->devfn);
 133         func = PCI_FUNC(pdev->devfn);
 134         /* ACPI _ADR encoding for PCI bus: */
 135         addr = (acpi_integer)(devnum << 16 | func);
 136
 137         DEBPRINT("ENTER: pci %02x:%02x.%01x\n", bus, devnum, func);
 138
 139         dev_handle = DEVICE_ACPI_HANDLE(dev);
 140         if (!dev_handle) {
 141                 DEBPRINT("no acpi handle for device\n");
 142                 goto err;
 143         }
 144
 145         status = acpi_get_object_info(dev_handle, &buffer);
 146         if (ACPI_FAILURE(status)) {
 147                 DEBPRINT("get_object_info for device failed\n");
 148                 goto err;
 149         }
 150         dinfo = buffer.pointer;
 151         if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
 152             dinfo->address == addr) {
 153                 *pcidevfn = addr;
 154                 *handle = dev_handle;
 155         } else {
 156                 DEBPRINT("get_object_info for device has wrong "
 157                         " address: %llu, should be %u\n",
 158                         dinfo ? (unsigned long long)dinfo->address : -1ULL,
 159                         (unsigned int)addr);
 160                 goto err;
 161         }
 162
 163         DEBPRINT("for dev=0x%x.%x, addr=0x%llx, *handle=0x%p\n",
 164                  devnum, func, (unsigned long long)addr, *handle);
 165         ret = 0;
 166 err:
 167         kfree(dinfo);
 168         return ret;
 169 }
 170
 171 /**
 172  * ide_acpi_hwif_get_handle - Get ACPI object handle for a given hwif
 173  * @hwif: device to locate
 174  *
 175  * Retrieves the object handle for a given hwif.
 176  *
 177  * Returns handle on success, 0 on error.
 178  */
 179 static acpi_handle ide_acpi_hwif_get_handle(ide_hwif_t *hwif)
 180 {
 181         struct device           *dev = hwif->gendev.parent;
 182         acpi_handle             uninitialized_var(dev_handle);
 183         acpi_integer            pcidevfn;
 184         acpi_handle             chan_handle;
 185         int                     err;
 186
 187         DEBPRINT("ENTER: device %s\n", hwif->name);
 188
 189         if (!dev) {
 190                 DEBPRINT("no PCI device for %s\n", hwif->name);
 191                 return NULL;
 192         }
 193
 194         err = ide_get_dev_handle(dev, &dev_handle, &pcidevfn);
 195         if (err < 0) {
 196                 DEBPRINT("ide_get_dev_handle failed (%d)\n", err);
 197                 return NULL;
 198         }
 199
 200         /* get child objects of dev_handle == channel objects,
 201          * + _their_ children == drive objects */
 202         /* channel is hwif->channel */
 203         chan_handle = acpi_get_child(dev_handle, hwif->channel);
 204         DEBPRINT("chan adr=%d: handle=0x%p\n",
 205                  hwif->channel, chan_handle);
 206
 207         return chan_handle;
 208 }
 209
 210 /**
 211  * ide_acpi_drive_get_handle - Get ACPI object handle for a given drive
 212  * @drive: device to locate
 213  *
 214  * Retrieves the object handle of a given drive. According to the ACPI
 215  * spec the drive is a child of the hwif.
 216  *
 217  * Returns handle on success, 0 on error.
 218  */
 219 static acpi_handle ide_acpi_drive_get_handle(ide_drive_t *drive)
 220 {
 221         ide_hwif_t      *hwif = HWIF(drive);
 222         int              port;
 223         acpi_handle      drive_handle;
 224
 225         if (!hwif->acpidata)
 226                 return NULL;
 227
 228         if (!hwif->acpidata->obj_handle)
 229                 return NULL;
 230
 231         port = hwif->channel ? drive->dn - 2: drive->dn;
 232
 233         DEBPRINT("ENTER: %s at channel#: %d port#: %d\n",
 234                  drive->name, hwif->channel, port);
 235
 236
 237         /* TBD: could also check ACPI object VALID bits */
 238         drive_handle = acpi_get_child(hwif->acpidata->obj_handle, port);
 239         DEBPRINT("drive %s handle 0x%p\n", drive->name, drive_handle);
 240
 241         return drive_handle;
 242 }
 243
 244 /**
 245  * do_drive_get_GTF - get the drive bootup default taskfile settings
 246  * @drive: the drive for which the taskfile settings should be retrieved
 247  * @gtf_length: number of bytes of _GTF data returned at @gtf_address
 248  * @gtf_address: buffer containing _GTF taskfile arrays
 249  *
 250  * The _GTF method has no input parameters.
 251  * It returns a variable number of register set values (registers
 252  * hex 1F1..1F7, taskfiles).
 253  * The <variable number> is not known in advance, so have ACPI-CA
 254  * allocate the buffer as needed and return it, then free it later.
 255  *
 256  * The returned @gtf_length and @gtf_address are only valid if the
 257  * function return value is 0.
 258  */
 259 static int do_drive_get_GTF(ide_drive_t *drive,
 260                      unsigned int *gtf_length, unsigned long *gtf_address,
 261                      unsigned long *obj_loc)
 262 {
 263         acpi_status                     status;
 264         struct acpi_buffer              output;
 265         union acpi_object               *out_obj;
 266         ide_hwif_t                      *hwif = HWIF(drive);
 267         struct device                   *dev = hwif->gendev.parent;
 268         int                             err = -ENODEV;
 269         int                             port;
 270
 271         *gtf_length = 0;
 272         *gtf_address = 0UL;
 273         *obj_loc = 0UL;
 274
 275         if (ide_noacpi)
 276                 return 0;
 277
 278         if (!dev) {
 279                 DEBPRINT("no PCI device for %s\n", hwif->name);
 280                 goto out;
 281         }
 282
 283         if (!hwif->acpidata) {
 284                 DEBPRINT("no ACPI data for %s\n", hwif->name);
 285                 goto out;
 286         }
 287
 288         port = hwif->channel ? drive->dn - 2: drive->dn;
 289
 290         DEBPRINT("ENTER: %s at %s, port#: %d, hard_port#: %d\n",
 291                  hwif->name, dev->bus_id, port, hwif->channel);
 292
 293         if (!drive->present) {
 294                 DEBPRINT("%s drive %d:%d not present\n",
 295                          hwif->name, hwif->channel, port);
 296                 goto out;
 297         }
 298
 299         /* Get this drive's _ADR info. if not already known. */
 300         if (!drive->acpidata->obj_handle) {
 301                 drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive);
 302                 if (!drive->acpidata->obj_handle) {
 303                         DEBPRINT("No ACPI object found for %s\n",
 304                                  drive->name);
 305                         goto out;
 306                 }
 307         }
 308
 309         /* Setting up output buffer */
 310         output.length = ACPI_ALLOCATE_BUFFER;
 311         output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
 312
 313         /* _GTF has no input parameters */
 314         err = -EIO;
 315         status = acpi_evaluate_object(drive->acpidata->obj_handle, "_GTF",
 316                                       NULL, &output);
 317         if (ACPI_FAILURE(status)) {
 318                 printk(KERN_DEBUG
 319                        "%s: Run _GTF error: status = 0x%x\n",
 320                        __func__, status);
 321                 goto out;
 322         }
 323
 324         if (!output.length || !output.pointer) {
 325                 DEBPRINT("Run _GTF: "
 326                        "length or ptr is NULL (0x%llx, 0x%p)\n",
 327                        (unsigned long long)output.length,
 328                        output.pointer);
 329                 goto out;
 330         }
 331
 332         out_obj = output.pointer;
 333         if (out_obj->type != ACPI_TYPE_BUFFER) {
 334                 DEBPRINT("Run _GTF: error: "
 335                        "expected object type of ACPI_TYPE_BUFFER, "
 336                        "got 0x%x\n", out_obj->type);
 337                 err = -ENOENT;
 338                 kfree(output.pointer);
 339                 goto out;
 340         }
 341
 342         if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
 343             out_obj->buffer.length % REGS_PER_GTF) {
 344                 printk(KERN_ERR
 345                        "%s: unexpected GTF length (%d) or addr (0x%p)\n",
 346                        __func__, out_obj->buffer.length,
 347                        out_obj->buffer.pointer);
 348                 err = -ENOENT;
 349                 kfree(output.pointer);
 350                 goto out;
 351         }
 352
 353         *gtf_length = out_obj->buffer.length;
 354         *gtf_address = (unsigned long)out_obj->buffer.pointer;
 355         *obj_loc = (unsigned long)out_obj;
 356         DEBPRINT("returning gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
 357                  *gtf_length, *gtf_address, *obj_loc);
 358         err = 0;
 359 out:
 360         return err;
 361 }
 362
 363 /**
 364  * taskfile_load_raw - send taskfile registers to drive
 365  * @drive: drive to which output is sent
 366  * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
 367  *
 368  * Outputs IDE taskfile to the drive.
 369  */
 370 static int taskfile_load_raw(ide_drive_t *drive,
 371                               const struct taskfile_array *gtf)
 372 {
 373         ide_task_t args;
 374         int err = 0;
 375
 376         DEBPRINT("(0x1f1-1f7): hex: "
 377                "%02x %02x %02x %02x %02x %02x %02x\n",
 378                gtf->tfa[0], gtf->tfa[1], gtf->tfa[2],
 379                gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]);
 380
 381         memset(&args, 0, sizeof(ide_task_t));
 382
 383         /* convert gtf to IDE Taskfile */
 384         memcpy(&args.tf_array[7], &gtf->tfa, 7);
 385         args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 386
 387         if (!ide_acpigtf) {
 388                 DEBPRINT("_GTF execution disabled\n");
 389                 return err;
 390         }
 391
 392         err = ide_no_data_taskfile(drive, &args);
 393         if (err)
 394                 printk(KERN_ERR "%s: ide_no_data_taskfile failed: %u\n",
 395                        __func__, err);
 396
 397         return err;
 398 }
 399
 400 /**
 401  * do_drive_set_taskfiles - write the drive taskfile settings from _GTF
 402  * @drive: the drive to which the taskfile command should be sent
 403  * @gtf_length: total number of bytes of _GTF taskfiles
 404  * @gtf_address: location of _GTF taskfile arrays
 405  *
 406  * Write {gtf_address, length gtf_length} in groups of
 407  * REGS_PER_GTF bytes.
 408  */
 409 static int do_drive_set_taskfiles(ide_drive_t *drive,
 410                                   unsigned int gtf_length,
 411                                   unsigned long gtf_address)
 412 {
 413         int                     rc = -ENODEV, err;
 414         int                     gtf_count = gtf_length / REGS_PER_GTF;
 415         int                     ix;
 416         struct taskfile_array   *gtf;
 417
 418         if (ide_noacpi)
 419                 return 0;
 420
 421         DEBPRINT("ENTER: %s, hard_port#: %d\n", drive->name, drive->dn);
 422
 423         if (!drive->present)
 424                 goto out;
 425         if (!gtf_count)         /* shouldn't be here */
 426                 goto out;
 427
 428         DEBPRINT("total GTF bytes=%u (0x%x), gtf_count=%d, addr=0x%lx\n",
 429                  gtf_length, gtf_length, gtf_count, gtf_address);
 430
 431         if (gtf_length % REGS_PER_GTF) {
 432                 printk(KERN_ERR "%s: unexpected GTF length (%d)\n",
 433                        __func__, gtf_length);
 434                 goto out;
 435         }
 436
 437         rc = 0;
 438         for (ix = 0; ix < gtf_count; ix++) {
 439                 gtf = (struct taskfile_array *)
 440                         (gtf_address + ix * REGS_PER_GTF);
 441
 442                 /* send all TaskFile registers (0x1f1-0x1f7) *in*that*order* */
 443                 err = taskfile_load_raw(drive, gtf);
 444                 if (err)
 445                         rc = err;
 446         }
 447
 448 out:
 449         return rc;
 450 }
 451
 452 /**
 453  * ide_acpi_exec_tfs - get then write drive taskfile settings
 454  * @drive: the drive for which the taskfile settings should be
 455  *         written.
 456  *
 457  * According to the ACPI spec this should be called after _STM
 458  * has been evaluated for the interface. Some ACPI vendors interpret
 459  * that as a hard requirement and modify the taskfile according
 460  * to the Identify Drive information passed down with _STM.
 461  * So one should really make sure to call this only after _STM has
 462  * been executed.
 463  */
 464 int ide_acpi_exec_tfs(ide_drive_t *drive)
 465 {
 466         int             ret;
 467         unsigned int    gtf_length;
 468         unsigned long   gtf_address;
 469         unsigned long   obj_loc;
 470
 471         if (ide_noacpi)
 472                 return 0;
 473
 474         DEBPRINT("call get_GTF, drive=%s port=%d\n", drive->name, drive->dn);
 475
 476         ret = do_drive_get_GTF(drive, &gtf_length, &gtf_address, &obj_loc);
 477         if (ret < 0) {
 478                 DEBPRINT("get_GTF error (%d)\n", ret);
 479                 return ret;
 480         }
 481
 482         DEBPRINT("call set_taskfiles, drive=%s\n", drive->name);
 483
 484         ret = do_drive_set_taskfiles(drive, gtf_length, gtf_address);
 485         kfree((void *)obj_loc);
 486         if (ret < 0) {
 487                 DEBPRINT("set_taskfiles error (%d)\n", ret);
 488         }
 489
 490         DEBPRINT("ret=%d\n", ret);
 491
 492         return ret;
 493 }
 494
 495 /**
 496  * ide_acpi_get_timing - get the channel (controller) timings
 497  * @hwif: target IDE interface (channel)
 498  *
 499  * This function executes the _GTM ACPI method for the target channel.
 500  *
 501  */
 502 void ide_acpi_get_timing(ide_hwif_t *hwif)
 503 {
 504         acpi_status             status;
 505         struct acpi_buffer      output;
 506         union acpi_object       *out_obj;
 507
 508         if (ide_noacpi)
 509                 return;
 510
 511         DEBPRINT("ENTER:\n");
 512
 513         if (!hwif->acpidata) {
 514                 DEBPRINT("no ACPI data for %s\n", hwif->name);
 515                 return;
 516         }
 517
 518         /* Setting up output buffer for _GTM */
 519         output.length = ACPI_ALLOCATE_BUFFER;
 520         output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
 521
 522         /* _GTM has no input parameters */
 523         status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_GTM",
 524                                       NULL, &output);
 525
 526         DEBPRINT("_GTM status: %d, outptr: 0x%p, outlen: 0x%llx\n",
 527                  status, output.pointer,
 528                  (unsigned long long)output.length);
 529
 530         if (ACPI_FAILURE(status)) {
 531                 DEBPRINT("Run _GTM error: status = 0x%x\n", status);
 532                 return;
 533         }
 534
 535         if (!output.length || !output.pointer) {
 536                 DEBPRINT("Run _GTM: length or ptr is NULL (0x%llx, 0x%p)\n",
 537                        (unsigned long long)output.length,
 538                        output.pointer);
 539                 kfree(output.pointer);
 540                 return;
 541         }
 542
 543         out_obj = output.pointer;
 544         if (out_obj->type != ACPI_TYPE_BUFFER) {
 545                 kfree(output.pointer);
 546                 DEBPRINT("Run _GTM: error: "
 547                        "expected object type of ACPI_TYPE_BUFFER, "
 548                        "got 0x%x\n", out_obj->type);
 549                 return;
 550         }
 551
 552         if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
 553             out_obj->buffer.length != sizeof(struct GTM_buffer)) {
 554                 kfree(output.pointer);
 555                 printk(KERN_ERR
 556                         "%s: unexpected _GTM length (0x%x)[should be 0x%zx] or "
 557                         "addr (0x%p)\n",
 558                         __func__, out_obj->buffer.length,
 559                         sizeof(struct GTM_buffer), out_obj->buffer.pointer);
 560                 return;
 561         }
 562
 563         memcpy(&hwif->acpidata->gtm, out_obj->buffer.pointer,
 564                sizeof(struct GTM_buffer));
 565
 566         DEBPRINT("_GTM info: ptr: 0x%p, len: 0x%x, exp.len: 0x%Zx\n",
 567                  out_obj->buffer.pointer, out_obj->buffer.length,
 568                  sizeof(struct GTM_buffer));
 569
 570         DEBPRINT("_GTM fields: 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n",
 571                  hwif->acpidata->gtm.PIO_speed0,
 572                  hwif->acpidata->gtm.DMA_speed0,
 573                  hwif->acpidata->gtm.PIO_speed1,
 574                  hwif->acpidata->gtm.DMA_speed1,
 575                  hwif->acpidata->gtm.GTM_flags);
 576
 577         kfree(output.pointer);
 578 }
 579
 580 /**
 581  * ide_acpi_push_timing - set the channel (controller) timings
 582  * @hwif: target IDE interface (channel)
 583  *
 584  * This function executes the _STM ACPI method for the target channel.
 585  *
 586  * _STM requires Identify Drive data, which has to passed as an argument.
 587  * Unfortunately hd_driveid is a mangled version which we can't readily
 588  * use; hence we'll get the information afresh.
 589  */
 590 void ide_acpi_push_timing(ide_hwif_t *hwif)
 591 {
 592         acpi_status             status;
 593         struct acpi_object_list input;
 594         union acpi_object       in_params[3];
 595         struct ide_acpi_drive_link      *master = &hwif->acpidata->master;
 596         struct ide_acpi_drive_link      *slave = &hwif->acpidata->slave;
 597
 598         if (ide_noacpi)
 599                 return;
 600
 601         DEBPRINT("ENTER:\n");
 602
 603         if (!hwif->acpidata) {
 604                 DEBPRINT("no ACPI data for %s\n", hwif->name);
 605                 return;
 606         }
 607
 608         /* Give the GTM buffer + drive Identify data to the channel via the
 609          * _STM method: */
 610         /* setup input parameters buffer for _STM */
 611         input.count = 3;
 612         input.pointer = in_params;
 613         in_params[0].type = ACPI_TYPE_BUFFER;
 614         in_params[0].buffer.length = sizeof(struct GTM_buffer);
 615         in_params[0].buffer.pointer = (u8 *)&hwif->acpidata->gtm;
 616         in_params[1].type = ACPI_TYPE_BUFFER;
 617         in_params[1].buffer.length = sizeof(struct hd_driveid);
 618         in_params[1].buffer.pointer = (u8 *)&master->idbuff;
 619         in_params[2].type = ACPI_TYPE_BUFFER;
 620         in_params[2].buffer.length = sizeof(struct hd_driveid);
 621         in_params[2].buffer.pointer = (u8 *)&slave->idbuff;
 622         /* Output buffer: _STM has no output */
 623
 624         status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_STM",
 625                                       &input, NULL);
 626
 627         if (ACPI_FAILURE(status)) {
 628                 DEBPRINT("Run _STM error: status = 0x%x\n", status);
 629         }
 630         DEBPRINT("_STM status: %d\n", status);
 631 }
 632
 633 /**
 634  * ide_acpi_set_state - set the channel power state
 635  * @hwif: target IDE interface
 636  * @on: state, on/off
 637  *
 638  * This function executes the _PS0/_PS3 ACPI method to set the power state.
 639  * ACPI spec requires _PS0 when IDE power on and _PS3 when power off
 640  */
 641 void ide_acpi_set_state(ide_hwif_t *hwif, int on)
 642 {
 643         int unit;
 644
 645         if (ide_noacpi || ide_noacpi_psx)
 646                 return;
 647
 648         DEBPRINT("ENTER:\n");
 649
 650         if (!hwif->acpidata) {
 651                 DEBPRINT("no ACPI data for %s\n", hwif->name);
 652                 return;
 653         }
 654         /* channel first and then drives for power on and verse versa for power off */
 655         if (on)
 656                 acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0);
 657         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 658                 ide_drive_t *drive = &hwif->drives[unit];
 659
 660                 if (!drive->acpidata->obj_handle)
 661                         drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive);
 662
 663                 if (drive->acpidata->obj_handle && drive->present) {
 664                         acpi_bus_set_power(drive->acpidata->obj_handle,
 665                                 on? ACPI_STATE_D0: ACPI_STATE_D3);
 666                 }
 667         }
 668         if (!on)
 669                 acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D3);
 670 }
 671
 672 /**
 673  * ide_acpi_init - initialize the ACPI link for an IDE interface
 674  * @hwif: target IDE interface (channel)
 675  *
 676  * The ACPI spec is not quite clear when the drive identify buffer
 677  * should be obtained. Calling IDENTIFY DEVICE during shutdown
 678  * is not the best of ideas as the drive might already being put to
 679  * sleep. And obviously we can't call it during resume.
 680  * So we get the information during startup; but this means that
 681  * any changes during run-time will be lost after resume.
 682  */
 683 void ide_acpi_init(ide_hwif_t *hwif)
 684 {
 685         ide_acpi_blacklist();
 686
 687         hwif->acpidata = kzalloc(sizeof(struct ide_acpi_hwif_link), GFP_KERNEL);
 688         if (!hwif->acpidata)
 689                 return;
 690
 691         hwif->acpidata->obj_handle = ide_acpi_hwif_get_handle(hwif);
 692         if (!hwif->acpidata->obj_handle) {
 693                 DEBPRINT("no ACPI object for %s found\n", hwif->name);
 694                 kfree(hwif->acpidata);
 695                 hwif->acpidata = NULL;
 696         }
 697 }
 698
 699 void ide_acpi_port_init_devices(ide_hwif_t *hwif)
 700 {
 701         ide_drive_t *drive;
 702         int i, err;
 703
 704         if (hwif->acpidata == NULL)
 705                 return;
 706
 707         /*
 708          * The ACPI spec mandates that we send information
 709          * for both drives, regardless whether they are connected
 710          * or not.
 711          */
 712         hwif->drives[0].acpidata = &hwif->acpidata->master;
 713         hwif->drives[1].acpidata = &hwif->acpidata->slave;
 714
 715         /*
 716          * Send IDENTIFY for each drive
 717          */
 718         for (i = 0; i < MAX_DRIVES; i++) {
 719                 drive = &hwif->drives[i];
 720
 721                 memset(drive->acpidata, 0, sizeof(*drive->acpidata));
 722
 723                 if (!drive->present)
 724                         continue;
 725
 726                 err = taskfile_lib_get_identify(drive, drive->acpidata->idbuff);
 727                 if (err)
 728                         DEBPRINT("identify device %s failed (%d)\n",
 729                                  drive->name, err);
 730         }
 731
 732         if (!ide_acpionboot) {
 733                 DEBPRINT("ACPI methods disabled on boot\n");
 734                 return;
 735         }
 736
 737         /* ACPI _PS0 before _STM */
 738         ide_acpi_set_state(hwif, 1);
 739         /*
 740          * ACPI requires us to call _STM on startup
 741          */
 742         ide_acpi_get_timing(hwif);
 743         ide_acpi_push_timing(hwif);
 744
 745         for (i = 0; i < MAX_DRIVES; i++) {
 746                 drive = &hwif->drives[i];
 747
 748                 if (drive->present)
 749                         /* Execute ACPI startup code */
 750                         ide_acpi_exec_tfs(drive);
 751         }
 752 }