linux/drivers/ide/ide-acpi.c
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   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
  29struct taskfile_array {
  30        u8      tfa[REGS_PER_GTF];      /* regs. 0x1f1 - 0x1f7 */
  31};
  32
  33struct GTM_buffer {
  34        u32     PIO_speed0;
  35        u32     DMA_speed0;
  36        u32     PIO_speed1;
  37        u32     DMA_speed1;
  38        u32     GTM_flags;
  39};
  40
  41struct ide_acpi_drive_link {
  42        acpi_handle      obj_handle;
  43        u8               idbuff[512];
  44};
  45
  46struct 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
  63static int ide_noacpi;
  64module_param_named(noacpi, ide_noacpi, bool, 0);
  65MODULE_PARM_DESC(noacpi, "disable IDE ACPI support");
  66
  67static int ide_acpigtf;
  68module_param_named(acpigtf, ide_acpigtf, bool, 0);
  69MODULE_PARM_DESC(acpigtf, "enable IDE ACPI _GTF support");
  70
  71static int ide_acpionboot;
  72module_param_named(acpionboot, ide_acpionboot, bool, 0);
  73MODULE_PARM_DESC(acpionboot, "call IDE ACPI methods on boot");
  74
  75static bool ide_noacpi_psx;
  76static 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
  83static 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
  98static 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 */
 118static 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;
 166err:
 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 */
 179static 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 */
 219static 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 */
 259static 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->dev_flags & IDE_DFLAG_PRESENT) == 0) {
 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;
 359out:
 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 */
 370static 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 */
 409static 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->dev_flags & IDE_DFLAG_PRESENT) == 0)
 424                goto out;
 425
 426        if (!gtf_count)         /* shouldn't be here */
 427                goto out;
 428
 429        DEBPRINT("total GTF bytes=%u (0x%x), gtf_count=%d, addr=0x%lx\n",
 430                 gtf_length, gtf_length, gtf_count, gtf_address);
 431
 432        if (gtf_length % REGS_PER_GTF) {
 433                printk(KERN_ERR "%s: unexpected GTF length (%d)\n",
 434                       __func__, gtf_length);
 435                goto out;
 436        }
 437
 438        rc = 0;
 439        for (ix = 0; ix < gtf_count; ix++) {
 440                gtf = (struct taskfile_array *)
 441                        (gtf_address + ix * REGS_PER_GTF);
 442
 443                /* send all TaskFile registers (0x1f1-0x1f7) *in*that*order* */
 444                err = taskfile_load_raw(drive, gtf);
 445                if (err)
 446                        rc = err;
 447        }
 448
 449out:
 450        return rc;
 451}
 452
 453/**
 454 * ide_acpi_exec_tfs - get then write drive taskfile settings
 455 * @drive: the drive for which the taskfile settings should be
 456 *         written.
 457 *
 458 * According to the ACPI spec this should be called after _STM
 459 * has been evaluated for the interface. Some ACPI vendors interpret
 460 * that as a hard requirement and modify the taskfile according
 461 * to the Identify Drive information passed down with _STM.
 462 * So one should really make sure to call this only after _STM has
 463 * been executed.
 464 */
 465int ide_acpi_exec_tfs(ide_drive_t *drive)
 466{
 467        int             ret;
 468        unsigned int    gtf_length;
 469        unsigned long   gtf_address;
 470        unsigned long   obj_loc;
 471
 472        if (ide_noacpi)
 473                return 0;
 474
 475        DEBPRINT("call get_GTF, drive=%s port=%d\n", drive->name, drive->dn);
 476
 477        ret = do_drive_get_GTF(drive, &gtf_length, &gtf_address, &obj_loc);
 478        if (ret < 0) {
 479                DEBPRINT("get_GTF error (%d)\n", ret);
 480                return ret;
 481        }
 482
 483        DEBPRINT("call set_taskfiles, drive=%s\n", drive->name);
 484
 485        ret = do_drive_set_taskfiles(drive, gtf_length, gtf_address);
 486        kfree((void *)obj_loc);
 487        if (ret < 0) {
 488                DEBPRINT("set_taskfiles error (%d)\n", ret);
 489        }
 490
 491        DEBPRINT("ret=%d\n", ret);
 492
 493        return ret;
 494}
 495
 496/**
 497 * ide_acpi_get_timing - get the channel (controller) timings
 498 * @hwif: target IDE interface (channel)
 499 *
 500 * This function executes the _GTM ACPI method for the target channel.
 501 *
 502 */
 503void ide_acpi_get_timing(ide_hwif_t *hwif)
 504{
 505        acpi_status             status;
 506        struct acpi_buffer      output;
 507        union acpi_object       *out_obj;
 508
 509        if (ide_noacpi)
 510                return;
 511
 512        DEBPRINT("ENTER:\n");
 513
 514        if (!hwif->acpidata) {
 515                DEBPRINT("no ACPI data for %s\n", hwif->name);
 516                return;
 517        }
 518
 519        /* Setting up output buffer for _GTM */
 520        output.length = ACPI_ALLOCATE_BUFFER;
 521        output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
 522
 523        /* _GTM has no input parameters */
 524        status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_GTM",
 525                                      NULL, &output);
 526
 527        DEBPRINT("_GTM status: %d, outptr: 0x%p, outlen: 0x%llx\n",
 528                 status, output.pointer,
 529                 (unsigned long long)output.length);
 530
 531        if (ACPI_FAILURE(status)) {
 532                DEBPRINT("Run _GTM error: status = 0x%x\n", status);
 533                return;
 534        }
 535
 536        if (!output.length || !output.pointer) {
 537                DEBPRINT("Run _GTM: length or ptr is NULL (0x%llx, 0x%p)\n",
 538                       (unsigned long long)output.length,
 539                       output.pointer);
 540                kfree(output.pointer);
 541                return;
 542        }
 543
 544        out_obj = output.pointer;
 545        if (out_obj->type != ACPI_TYPE_BUFFER) {
 546                kfree(output.pointer);
 547                DEBPRINT("Run _GTM: error: "
 548                       "expected object type of ACPI_TYPE_BUFFER, "
 549                       "got 0x%x\n", out_obj->type);
 550                return;
 551        }
 552
 553        if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
 554            out_obj->buffer.length != sizeof(struct GTM_buffer)) {
 555                kfree(output.pointer);
 556                printk(KERN_ERR
 557                        "%s: unexpected _GTM length (0x%x)[should be 0x%zx] or "
 558                        "addr (0x%p)\n",
 559                        __func__, out_obj->buffer.length,
 560                        sizeof(struct GTM_buffer), out_obj->buffer.pointer);
 561                return;
 562        }
 563
 564        memcpy(&hwif->acpidata->gtm, out_obj->buffer.pointer,
 565               sizeof(struct GTM_buffer));
 566
 567        DEBPRINT("_GTM info: ptr: 0x%p, len: 0x%x, exp.len: 0x%Zx\n",
 568                 out_obj->buffer.pointer, out_obj->buffer.length,
 569                 sizeof(struct GTM_buffer));
 570
 571        DEBPRINT("_GTM fields: 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n",
 572                 hwif->acpidata->gtm.PIO_speed0,
 573                 hwif->acpidata->gtm.DMA_speed0,
 574                 hwif->acpidata->gtm.PIO_speed1,
 575                 hwif->acpidata->gtm.DMA_speed1,
 576                 hwif->acpidata->gtm.GTM_flags);
 577
 578        kfree(output.pointer);
 579}
 580
 581/**
 582 * ide_acpi_push_timing - set the channel (controller) timings
 583 * @hwif: target IDE interface (channel)
 584 *
 585 * This function executes the _STM ACPI method for the target channel.
 586 *
 587 * _STM requires Identify Drive data, which has to passed as an argument.
 588 * Unfortunately drive->id is a mangled version which we can't readily
 589 * use; hence we'll get the information afresh.
 590 */
 591void ide_acpi_push_timing(ide_hwif_t *hwif)
 592{
 593        acpi_status             status;
 594        struct acpi_object_list input;
 595        union acpi_object       in_params[3];
 596        struct ide_acpi_drive_link      *master = &hwif->acpidata->master;
 597        struct ide_acpi_drive_link      *slave = &hwif->acpidata->slave;
 598
 599        if (ide_noacpi)
 600                return;
 601
 602        DEBPRINT("ENTER:\n");
 603
 604        if (!hwif->acpidata) {
 605                DEBPRINT("no ACPI data for %s\n", hwif->name);
 606                return;
 607        }
 608
 609        /* Give the GTM buffer + drive Identify data to the channel via the
 610         * _STM method: */
 611        /* setup input parameters buffer for _STM */
 612        input.count = 3;
 613        input.pointer = in_params;
 614        in_params[0].type = ACPI_TYPE_BUFFER;
 615        in_params[0].buffer.length = sizeof(struct GTM_buffer);
 616        in_params[0].buffer.pointer = (u8 *)&hwif->acpidata->gtm;
 617        in_params[1].type = ACPI_TYPE_BUFFER;
 618        in_params[1].buffer.length = sizeof(ATA_ID_WORDS * 2);
 619        in_params[1].buffer.pointer = (u8 *)&master->idbuff;
 620        in_params[2].type = ACPI_TYPE_BUFFER;
 621        in_params[2].buffer.length = sizeof(ATA_ID_WORDS * 2);
 622        in_params[2].buffer.pointer = (u8 *)&slave->idbuff;
 623        /* Output buffer: _STM has no output */
 624
 625        status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_STM",
 626                                      &input, NULL);
 627
 628        if (ACPI_FAILURE(status)) {
 629                DEBPRINT("Run _STM error: status = 0x%x\n", status);
 630        }
 631        DEBPRINT("_STM status: %d\n", status);
 632}
 633
 634/**
 635 * ide_acpi_set_state - set the channel power state
 636 * @hwif: target IDE interface
 637 * @on: state, on/off
 638 *
 639 * This function executes the _PS0/_PS3 ACPI method to set the power state.
 640 * ACPI spec requires _PS0 when IDE power on and _PS3 when power off
 641 */
 642void ide_acpi_set_state(ide_hwif_t *hwif, int on)
 643{
 644        int unit;
 645
 646        if (ide_noacpi || ide_noacpi_psx)
 647                return;
 648
 649        DEBPRINT("ENTER:\n");
 650
 651        if (!hwif->acpidata) {
 652                DEBPRINT("no ACPI data for %s\n", hwif->name);
 653                return;
 654        }
 655        /* channel first and then drives for power on and verse versa for power off */
 656        if (on)
 657                acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0);
 658        for (unit = 0; unit < MAX_DRIVES; ++unit) {
 659                ide_drive_t *drive = &hwif->drives[unit];
 660
 661                if (!drive->acpidata->obj_handle)
 662                        drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive);
 663
 664                if (drive->acpidata->obj_handle &&
 665                    (drive->dev_flags & IDE_DFLAG_PRESENT)) {
 666                        acpi_bus_set_power(drive->acpidata->obj_handle,
 667                                on? ACPI_STATE_D0: ACPI_STATE_D3);
 668                }
 669        }
 670        if (!on)
 671                acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D3);
 672}
 673
 674/**
 675 * ide_acpi_init - initialize the ACPI link for an IDE interface
 676 * @hwif: target IDE interface (channel)
 677 *
 678 * The ACPI spec is not quite clear when the drive identify buffer
 679 * should be obtained. Calling IDENTIFY DEVICE during shutdown
 680 * is not the best of ideas as the drive might already being put to
 681 * sleep. And obviously we can't call it during resume.
 682 * So we get the information during startup; but this means that
 683 * any changes during run-time will be lost after resume.
 684 */
 685void ide_acpi_init(ide_hwif_t *hwif)
 686{
 687        ide_acpi_blacklist();
 688
 689        hwif->acpidata = kzalloc(sizeof(struct ide_acpi_hwif_link), GFP_KERNEL);
 690        if (!hwif->acpidata)
 691                return;
 692
 693        hwif->acpidata->obj_handle = ide_acpi_hwif_get_handle(hwif);
 694        if (!hwif->acpidata->obj_handle) {
 695                DEBPRINT("no ACPI object for %s found\n", hwif->name);
 696                kfree(hwif->acpidata);
 697                hwif->acpidata = NULL;
 698        }
 699}
 700
 701void ide_acpi_port_init_devices(ide_hwif_t *hwif)
 702{
 703        ide_drive_t *drive;
 704        int i, err;
 705
 706        if (hwif->acpidata == NULL)
 707                return;
 708
 709        /*
 710         * The ACPI spec mandates that we send information
 711         * for both drives, regardless whether they are connected
 712         * or not.
 713         */
 714        hwif->drives[0].acpidata = &hwif->acpidata->master;
 715        hwif->drives[1].acpidata = &hwif->acpidata->slave;
 716
 717        /*
 718         * Send IDENTIFY for each drive
 719         */
 720        for (i = 0; i < MAX_DRIVES; i++) {
 721                drive = &hwif->drives[i];
 722
 723                memset(drive->acpidata, 0, sizeof(*drive->acpidata));
 724
 725                if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 726                        continue;
 727
 728                err = taskfile_lib_get_identify(drive, drive->acpidata->idbuff);
 729                if (err)
 730                        DEBPRINT("identify device %s failed (%d)\n",
 731                                 drive->name, err);
 732        }
 733
 734        if (!ide_acpionboot) {
 735                DEBPRINT("ACPI methods disabled on boot\n");
 736                return;
 737        }
 738
 739        /* ACPI _PS0 before _STM */
 740        ide_acpi_set_state(hwif, 1);
 741        /*
 742         * ACPI requires us to call _STM on startup
 743         */
 744        ide_acpi_get_timing(hwif);
 745        ide_acpi_push_timing(hwif);
 746
 747        for (i = 0; i < MAX_DRIVES; i++) {
 748                drive = &hwif->drives[i];
 749
 750                if (drive->dev_flags & IDE_DFLAG_PRESENT)
 751                        /* Execute ACPI startup code */
 752                        ide_acpi_exec_tfs(drive);
 753        }
 754}
 755