linux/drivers/ide/ide-acpi.c
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   1/*
   2 * ide-acpi.c
   3 * Provides ACPI support for IDE drives.
   4 *
   5 * Copyright (C) 2005 Intel Corp.
   6 * Copyright (C) 2005 Randy Dunlap
   7 * Copyright (C) 2006 SUSE Linux Products GmbH
   8 * Copyright (C) 2006 Hannes Reinecke
   9 */
  10
  11#include <linux/ata.h>
  12#include <linux/delay.h>
  13#include <linux/device.h>
  14#include <linux/errno.h>
  15#include <linux/kernel.h>
  16#include <acpi/acpi.h>
  17#include <linux/ide.h>
  18#include <linux/pci.h>
  19#include <linux/dmi.h>
  20
  21#include <acpi/acpi_bus.h>
  22#include <acpi/acnames.h>
  23#include <acpi/acnamesp.h>
  24#include <acpi/acparser.h>
  25#include <acpi/acexcep.h>
  26#include <acpi/acmacros.h>
  27#include <acpi/actypes.h>
  28
  29#define REGS_PER_GTF            7
  30struct taskfile_array {
  31        u8      tfa[REGS_PER_GTF];      /* regs. 0x1f1 - 0x1f7 */
  32};
  33
  34struct GTM_buffer {
  35        u32     PIO_speed0;
  36        u32     DMA_speed0;
  37        u32     PIO_speed1;
  38        u32     DMA_speed1;
  39        u32     GTM_flags;
  40};
  41
  42struct ide_acpi_drive_link {
  43        ide_drive_t     *drive;
  44        acpi_handle      obj_handle;
  45        u8               idbuff[512];
  46};
  47
  48struct ide_acpi_hwif_link {
  49        ide_hwif_t                      *hwif;
  50        acpi_handle                      obj_handle;
  51        struct GTM_buffer                gtm;
  52        struct ide_acpi_drive_link       master;
  53        struct ide_acpi_drive_link       slave;
  54};
  55
  56#undef DEBUGGING
  57/* note: adds function name and KERN_DEBUG */
  58#ifdef DEBUGGING
  59#define DEBPRINT(fmt, args...)  \
  60                printk(KERN_DEBUG "%s: " fmt, __FUNCTION__, ## args)
  61#else
  62#define DEBPRINT(fmt, args...)  do {} while (0)
  63#endif  /* DEBUGGING */
  64
  65extern int ide_noacpi;
  66extern int ide_noacpitfs;
  67extern int ide_noacpionboot;
  68
  69static bool ide_noacpi_psx;
  70static 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
  77static 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
  92static 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 */
 112static 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;
 160err:
 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 */
 173static acpi_handle ide_acpi_hwif_get_handle(ide_hwif_t *hwif)
 174{
 175        struct device           *dev = hwif->gendev.parent;
 176        acpi_handle             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 */
 213static acpi_handle ide_acpi_drive_get_handle(ide_drive_t *drive)
 214{
 215        ide_hwif_t      *hwif = HWIF(drive);
 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 */
 253static 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 = HWIF(drive);
 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        if (!drive->acpidata) {
 285                if (port == 0) {
 286                        drive->acpidata = &hwif->acpidata->master;
 287                        hwif->acpidata->master.drive = drive;
 288                } else {
 289                        drive->acpidata = &hwif->acpidata->slave;
 290                        hwif->acpidata->slave.drive = drive;
 291                }
 292        }
 293
 294        DEBPRINT("ENTER: %s at %s, port#: %d, hard_port#: %d\n",
 295                 hwif->name, dev->bus_id, port, hwif->channel);
 296
 297        if (!drive->present) {
 298                DEBPRINT("%s drive %d:%d not present\n",
 299                         hwif->name, hwif->channel, port);
 300                goto out;
 301        }
 302
 303        /* Get this drive's _ADR info. if not already known. */
 304        if (!drive->acpidata->obj_handle) {
 305                drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive);
 306                if (!drive->acpidata->obj_handle) {
 307                        DEBPRINT("No ACPI object found for %s\n",
 308                                 drive->name);
 309                        goto out;
 310                }
 311        }
 312
 313        /* Setting up output buffer */
 314        output.length = ACPI_ALLOCATE_BUFFER;
 315        output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
 316
 317        /* _GTF has no input parameters */
 318        err = -EIO;
 319        status = acpi_evaluate_object(drive->acpidata->obj_handle, "_GTF",
 320                                      NULL, &output);
 321        if (ACPI_FAILURE(status)) {
 322                printk(KERN_DEBUG
 323                       "%s: Run _GTF error: status = 0x%x\n",
 324                       __FUNCTION__, status);
 325                goto out;
 326        }
 327
 328        if (!output.length || !output.pointer) {
 329                DEBPRINT("Run _GTF: "
 330                       "length or ptr is NULL (0x%llx, 0x%p)\n",
 331                       (unsigned long long)output.length,
 332                       output.pointer);
 333                goto out;
 334        }
 335
 336        out_obj = output.pointer;
 337        if (out_obj->type != ACPI_TYPE_BUFFER) {
 338                DEBPRINT("Run _GTF: error: "
 339                       "expected object type of ACPI_TYPE_BUFFER, "
 340                       "got 0x%x\n", out_obj->type);
 341                err = -ENOENT;
 342                kfree(output.pointer);
 343                goto out;
 344        }
 345
 346        if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
 347            out_obj->buffer.length % REGS_PER_GTF) {
 348                printk(KERN_ERR
 349                       "%s: unexpected GTF length (%d) or addr (0x%p)\n",
 350                       __FUNCTION__, out_obj->buffer.length,
 351                       out_obj->buffer.pointer);
 352                err = -ENOENT;
 353                kfree(output.pointer);
 354                goto out;
 355        }
 356
 357        *gtf_length = out_obj->buffer.length;
 358        *gtf_address = (unsigned long)out_obj->buffer.pointer;
 359        *obj_loc = (unsigned long)out_obj;
 360        DEBPRINT("returning gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
 361                 *gtf_length, *gtf_address, *obj_loc);
 362        err = 0;
 363out:
 364        return err;
 365}
 366
 367/**
 368 * taskfile_load_raw - send taskfile registers to drive
 369 * @drive: drive to which output is sent
 370 * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
 371 *
 372 * Outputs IDE taskfile to the drive.
 373 */
 374static int taskfile_load_raw(ide_drive_t *drive,
 375                              const struct taskfile_array *gtf)
 376{
 377        ide_task_t args;
 378        int err = 0;
 379
 380        DEBPRINT("(0x1f1-1f7): hex: "
 381               "%02x %02x %02x %02x %02x %02x %02x\n",
 382               gtf->tfa[0], gtf->tfa[1], gtf->tfa[2],
 383               gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]);
 384
 385        memset(&args, 0, sizeof(ide_task_t));
 386        args.command_type = IDE_DRIVE_TASK_NO_DATA;
 387        args.data_phase   = TASKFILE_NO_DATA;
 388        args.handler      = &task_no_data_intr;
 389
 390        /* convert gtf to IDE Taskfile */
 391        args.tfRegister[1] = gtf->tfa[0];       /* 0x1f1 */
 392        args.tfRegister[2] = gtf->tfa[1];       /* 0x1f2 */
 393        args.tfRegister[3] = gtf->tfa[2];       /* 0x1f3 */
 394        args.tfRegister[4] = gtf->tfa[3];       /* 0x1f4 */
 395        args.tfRegister[5] = gtf->tfa[4];       /* 0x1f5 */
 396        args.tfRegister[6] = gtf->tfa[5];       /* 0x1f6 */
 397        args.tfRegister[7] = gtf->tfa[6];       /* 0x1f7 */
 398
 399        if (ide_noacpitfs) {
 400                DEBPRINT("_GTF execution disabled\n");
 401                return err;
 402        }
 403
 404        err = ide_raw_taskfile(drive, &args, NULL);
 405        if (err)
 406                printk(KERN_ERR "%s: ide_raw_taskfile failed: %u\n",
 407                       __FUNCTION__, err);
 408
 409        return err;
 410}
 411
 412/**
 413 * do_drive_set_taskfiles - write the drive taskfile settings from _GTF
 414 * @drive: the drive to which the taskfile command should be sent
 415 * @gtf_length: total number of bytes of _GTF taskfiles
 416 * @gtf_address: location of _GTF taskfile arrays
 417 *
 418 * Write {gtf_address, length gtf_length} in groups of
 419 * REGS_PER_GTF bytes.
 420 */
 421static int do_drive_set_taskfiles(ide_drive_t *drive,
 422                                  unsigned int gtf_length,
 423                                  unsigned long gtf_address)
 424{
 425        int                     rc = -ENODEV, err;
 426        int                     gtf_count = gtf_length / REGS_PER_GTF;
 427        int                     ix;
 428        struct taskfile_array   *gtf;
 429
 430        if (ide_noacpi)
 431                return 0;
 432
 433        DEBPRINT("ENTER: %s, hard_port#: %d\n", drive->name, drive->dn);
 434
 435        if (!drive->present)
 436                goto out;
 437        if (!gtf_count)         /* shouldn't be here */
 438                goto out;
 439
 440        DEBPRINT("total GTF bytes=%u (0x%x), gtf_count=%d, addr=0x%lx\n",
 441                 gtf_length, gtf_length, gtf_count, gtf_address);
 442
 443        if (gtf_length % REGS_PER_GTF) {
 444                printk(KERN_ERR "%s: unexpected GTF length (%d)\n",
 445                       __FUNCTION__, gtf_length);
 446                goto out;
 447        }
 448
 449        rc = 0;
 450        for (ix = 0; ix < gtf_count; ix++) {
 451                gtf = (struct taskfile_array *)
 452                        (gtf_address + ix * REGS_PER_GTF);
 453
 454                /* send all TaskFile registers (0x1f1-0x1f7) *in*that*order* */
 455                err = taskfile_load_raw(drive, gtf);
 456                if (err)
 457                        rc = err;
 458        }
 459
 460out:
 461        return rc;
 462}
 463
 464/**
 465 * ide_acpi_exec_tfs - get then write drive taskfile settings
 466 * @drive: the drive for which the taskfile settings should be
 467 *         written.
 468 *
 469 * According to the ACPI spec this should be called after _STM
 470 * has been evaluated for the interface. Some ACPI vendors interpret
 471 * that as a hard requirement and modify the taskfile according
 472 * to the Identify Drive information passed down with _STM.
 473 * So one should really make sure to call this only after _STM has
 474 * been executed.
 475 */
 476int ide_acpi_exec_tfs(ide_drive_t *drive)
 477{
 478        int             ret;
 479        unsigned int    gtf_length;
 480        unsigned long   gtf_address;
 481        unsigned long   obj_loc;
 482
 483        if (ide_noacpi)
 484                return 0;
 485
 486        DEBPRINT("call get_GTF, drive=%s port=%d\n", drive->name, drive->dn);
 487
 488        ret = do_drive_get_GTF(drive, &gtf_length, &gtf_address, &obj_loc);
 489        if (ret < 0) {
 490                DEBPRINT("get_GTF error (%d)\n", ret);
 491                return ret;
 492        }
 493
 494        DEBPRINT("call set_taskfiles, drive=%s\n", drive->name);
 495
 496        ret = do_drive_set_taskfiles(drive, gtf_length, gtf_address);
 497        kfree((void *)obj_loc);
 498        if (ret < 0) {
 499                DEBPRINT("set_taskfiles error (%d)\n", ret);
 500        }
 501
 502        DEBPRINT("ret=%d\n", ret);
 503
 504        return ret;
 505}
 506EXPORT_SYMBOL_GPL(ide_acpi_exec_tfs);
 507
 508/**
 509 * ide_acpi_get_timing - get the channel (controller) timings
 510 * @hwif: target IDE interface (channel)
 511 *
 512 * This function executes the _GTM ACPI method for the target channel.
 513 *
 514 */
 515void ide_acpi_get_timing(ide_hwif_t *hwif)
 516{
 517        acpi_status             status;
 518        struct acpi_buffer      output;
 519        union acpi_object       *out_obj;
 520
 521        if (ide_noacpi)
 522                return;
 523
 524        DEBPRINT("ENTER:\n");
 525
 526        if (!hwif->acpidata) {
 527                DEBPRINT("no ACPI data for %s\n", hwif->name);
 528                return;
 529        }
 530
 531        /* Setting up output buffer for _GTM */
 532        output.length = ACPI_ALLOCATE_BUFFER;
 533        output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
 534
 535        /* _GTM has no input parameters */
 536        status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_GTM",
 537                                      NULL, &output);
 538
 539        DEBPRINT("_GTM status: %d, outptr: 0x%p, outlen: 0x%llx\n",
 540                 status, output.pointer,
 541                 (unsigned long long)output.length);
 542
 543        if (ACPI_FAILURE(status)) {
 544                DEBPRINT("Run _GTM error: status = 0x%x\n", status);
 545                return;
 546        }
 547
 548        if (!output.length || !output.pointer) {
 549                DEBPRINT("Run _GTM: length or ptr is NULL (0x%llx, 0x%p)\n",
 550                       (unsigned long long)output.length,
 551                       output.pointer);
 552                kfree(output.pointer);
 553                return;
 554        }
 555
 556        out_obj = output.pointer;
 557        if (out_obj->type != ACPI_TYPE_BUFFER) {
 558                kfree(output.pointer);
 559                DEBPRINT("Run _GTM: error: "
 560                       "expected object type of ACPI_TYPE_BUFFER, "
 561                       "got 0x%x\n", out_obj->type);
 562                return;
 563        }
 564
 565        if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
 566            out_obj->buffer.length != sizeof(struct GTM_buffer)) {
 567                kfree(output.pointer);
 568                printk(KERN_ERR
 569                        "%s: unexpected _GTM length (0x%x)[should be 0x%zx] or "
 570                        "addr (0x%p)\n",
 571                        __FUNCTION__, out_obj->buffer.length,
 572                        sizeof(struct GTM_buffer), out_obj->buffer.pointer);
 573                return;
 574        }
 575
 576        memcpy(&hwif->acpidata->gtm, out_obj->buffer.pointer,
 577               sizeof(struct GTM_buffer));
 578
 579        DEBPRINT("_GTM info: ptr: 0x%p, len: 0x%x, exp.len: 0x%Zx\n",
 580                 out_obj->buffer.pointer, out_obj->buffer.length,
 581                 sizeof(struct GTM_buffer));
 582
 583        DEBPRINT("_GTM fields: 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n",
 584                 hwif->acpidata->gtm.PIO_speed0,
 585                 hwif->acpidata->gtm.DMA_speed0,
 586                 hwif->acpidata->gtm.PIO_speed1,
 587                 hwif->acpidata->gtm.DMA_speed1,
 588                 hwif->acpidata->gtm.GTM_flags);
 589
 590        kfree(output.pointer);
 591}
 592EXPORT_SYMBOL_GPL(ide_acpi_get_timing);
 593
 594/**
 595 * ide_acpi_push_timing - set the channel (controller) timings
 596 * @hwif: target IDE interface (channel)
 597 *
 598 * This function executes the _STM ACPI method for the target channel.
 599 *
 600 * _STM requires Identify Drive data, which has to passed as an argument.
 601 * Unfortunately hd_driveid is a mangled version which we can't readily
 602 * use; hence we'll get the information afresh.
 603 */
 604void ide_acpi_push_timing(ide_hwif_t *hwif)
 605{
 606        acpi_status             status;
 607        struct acpi_object_list input;
 608        union acpi_object       in_params[3];
 609        struct ide_acpi_drive_link      *master = &hwif->acpidata->master;
 610        struct ide_acpi_drive_link      *slave = &hwif->acpidata->slave;
 611
 612        if (ide_noacpi)
 613                return;
 614
 615        DEBPRINT("ENTER:\n");
 616
 617        if (!hwif->acpidata) {
 618                DEBPRINT("no ACPI data for %s\n", hwif->name);
 619                return;
 620        }
 621
 622        /* Give the GTM buffer + drive Identify data to the channel via the
 623         * _STM method: */
 624        /* setup input parameters buffer for _STM */
 625        input.count = 3;
 626        input.pointer = in_params;
 627        in_params[0].type = ACPI_TYPE_BUFFER;
 628        in_params[0].buffer.length = sizeof(struct GTM_buffer);
 629        in_params[0].buffer.pointer = (u8 *)&hwif->acpidata->gtm;
 630        in_params[1].type = ACPI_TYPE_BUFFER;
 631        in_params[1].buffer.length = sizeof(struct hd_driveid);
 632        in_params[1].buffer.pointer = (u8 *)&master->idbuff;
 633        in_params[2].type = ACPI_TYPE_BUFFER;
 634        in_params[2].buffer.length = sizeof(struct hd_driveid);
 635        in_params[2].buffer.pointer = (u8 *)&slave->idbuff;
 636        /* Output buffer: _STM has no output */
 637
 638        status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_STM",
 639                                      &input, NULL);
 640
 641        if (ACPI_FAILURE(status)) {
 642                DEBPRINT("Run _STM error: status = 0x%x\n", status);
 643        }
 644        DEBPRINT("_STM status: %d\n", status);
 645}
 646EXPORT_SYMBOL_GPL(ide_acpi_push_timing);
 647
 648/**
 649 * ide_acpi_set_state - set the channel power state
 650 * @hwif: target IDE interface
 651 * @on: state, on/off
 652 *
 653 * This function executes the _PS0/_PS3 ACPI method to set the power state.
 654 * ACPI spec requires _PS0 when IDE power on and _PS3 when power off
 655 */
 656void ide_acpi_set_state(ide_hwif_t *hwif, int on)
 657{
 658        int unit;
 659
 660        if (ide_noacpi || ide_noacpi_psx)
 661                return;
 662
 663        DEBPRINT("ENTER:\n");
 664
 665        if (!hwif->acpidata) {
 666                DEBPRINT("no ACPI data for %s\n", hwif->name);
 667                return;
 668        }
 669        /* channel first and then drives for power on and verse versa for power off */
 670        if (on)
 671                acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0);
 672        for (unit = 0; unit < MAX_DRIVES; ++unit) {
 673                ide_drive_t *drive = &hwif->drives[unit];
 674
 675                if (!drive->acpidata->obj_handle)
 676                        drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive);
 677
 678                if (drive->acpidata->obj_handle && drive->present) {
 679                        acpi_bus_set_power(drive->acpidata->obj_handle,
 680                                on? ACPI_STATE_D0: ACPI_STATE_D3);
 681                }
 682        }
 683        if (!on)
 684                acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D3);
 685}
 686
 687/**
 688 * ide_acpi_init - initialize the ACPI link for an IDE interface
 689 * @hwif: target IDE interface (channel)
 690 *
 691 * The ACPI spec is not quite clear when the drive identify buffer
 692 * should be obtained. Calling IDENTIFY DEVICE during shutdown
 693 * is not the best of ideas as the drive might already being put to
 694 * sleep. And obviously we can't call it during resume.
 695 * So we get the information during startup; but this means that
 696 * any changes during run-time will be lost after resume.
 697 */
 698void ide_acpi_init(ide_hwif_t *hwif)
 699{
 700        int unit;
 701        int                     err;
 702        struct ide_acpi_drive_link      *master;
 703        struct ide_acpi_drive_link      *slave;
 704
 705        ide_acpi_blacklist();
 706
 707        hwif->acpidata = kzalloc(sizeof(struct ide_acpi_hwif_link), GFP_KERNEL);
 708        if (!hwif->acpidata)
 709                return;
 710
 711        hwif->acpidata->obj_handle = ide_acpi_hwif_get_handle(hwif);
 712        if (!hwif->acpidata->obj_handle) {
 713                DEBPRINT("no ACPI object for %s found\n", hwif->name);
 714                kfree(hwif->acpidata);
 715                hwif->acpidata = NULL;
 716                return;
 717        }
 718
 719        /*
 720         * The ACPI spec mandates that we send information
 721         * for both drives, regardless whether they are connected
 722         * or not.
 723         */
 724        hwif->acpidata->master.drive = &hwif->drives[0];
 725        hwif->drives[0].acpidata = &hwif->acpidata->master;
 726        master = &hwif->acpidata->master;
 727
 728        hwif->acpidata->slave.drive = &hwif->drives[1];
 729        hwif->drives[1].acpidata = &hwif->acpidata->slave;
 730        slave = &hwif->acpidata->slave;
 731
 732
 733        /*
 734         * Send IDENTIFY for each drive
 735         */
 736        if (master->drive->present) {
 737                err = taskfile_lib_get_identify(master->drive, master->idbuff);
 738                if (err) {
 739                        DEBPRINT("identify device %s failed (%d)\n",
 740                                 master->drive->name, err);
 741                }
 742        }
 743
 744        if (slave->drive->present) {
 745                err = taskfile_lib_get_identify(slave->drive, slave->idbuff);
 746                if (err) {
 747                        DEBPRINT("identify device %s failed (%d)\n",
 748                                 slave->drive->name, err);
 749                }
 750        }
 751
 752        if (ide_noacpionboot) {
 753                DEBPRINT("ACPI methods disabled on boot\n");
 754                return;
 755        }
 756
 757        /* ACPI _PS0 before _STM */
 758        ide_acpi_set_state(hwif, 1);
 759        /*
 760         * ACPI requires us to call _STM on startup
 761         */
 762        ide_acpi_get_timing(hwif);
 763        ide_acpi_push_timing(hwif);
 764
 765        for (unit = 0; unit < MAX_DRIVES; ++unit) {
 766                ide_drive_t *drive = &hwif->drives[unit];
 767
 768                if (drive->present) {
 769                        /* Execute ACPI startup code */
 770                        ide_acpi_exec_tfs(drive);
 771                }
 772        }
 773}
 774EXPORT_SYMBOL_GPL(ide_acpi_init);
 775
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