drivers/ide/ide-acpi.c

   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
  30 struct taskfile_array {
  31         u8      tfa[REGS_PER_GTF];      /* regs. 0x1f1 - 0x1f7 */
  32 };
  33
  34 struct GTM_buffer {
  35         u32     PIO_speed0;
  36         u32     DMA_speed0;
  37         u32     PIO_speed1;
  38         u32     DMA_speed1;
  39         u32     GTM_flags;
  40 };
  41
  42 struct ide_acpi_drive_link {
  43         ide_drive_t     *drive;
  44         acpi_handle      obj_handle;
  45         u8               idbuff[512];
  46 };
  47
  48 struct 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
  65 extern int ide_noacpi;
  66 extern int ide_noacpitfs;
  67 extern int ide_noacpionboot;
  68
  69 static bool ide_noacpi_psx;
  70 static int no_acpi_psx(const struct dmi_system_id *id)
  71 {
  72         ide_noacpi_psx = true;
  73         printk(KERN_NOTICE"%s detected - disable ACPI _PSx.\n", id->ident);
  74         return 0;
  75 }
  76
  77 static const struct dmi_system_id ide_acpi_dmi_table[] = {
  78         /* Bug 9673. */
  79         /* We should check if this is because ACPI NVS isn't save/restored. */
  80         {
  81                 .callback = no_acpi_psx,
  82                 .ident    = "HP nx9005",
  83                 .matches  = {
  84                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies Ltd."),
  85                         DMI_MATCH(DMI_BIOS_VERSION, "KAM1.60")
  86                 },
  87         },
  88 };
  89
  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             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         if (!drive->acpidata) {
 283                 if (port == 0) {
 284                         drive->acpidata = &hwif->acpidata->master;
 285                         hwif->acpidata->master.drive = drive;
 286                 } else {
 287                         drive->acpidata = &hwif->acpidata->slave;
 288                         hwif->acpidata->slave.drive = drive;
 289                 }
 290         }
 291
 292         DEBPRINT("ENTER: %s at %s, port#: %d, hard_port#: %d\n",
 293                  hwif->name, dev->bus_id, port, hwif->channel);
 294
 295         if (!drive->present) {
 296                 DEBPRINT("%s drive %d:%d not present\n",
 297                          hwif->name, hwif->channel, port);
 298                 goto out;
 299         }
 300
 301         /* Get this drive's _ADR info. if not already known. */
 302         if (!drive->acpidata->obj_handle) {
 303                 drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive);
 304                 if (!drive->acpidata->obj_handle) {
 305                         DEBPRINT("No ACPI object found for %s\n",
 306                                  drive->name);
 307                         goto out;
 308                 }
 309         }
 310
 311         /* Setting up output buffer */
 312         output.length = ACPI_ALLOCATE_BUFFER;
 313         output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
 314
 315         /* _GTF has no input parameters */
 316         err = -EIO;
 317         status = acpi_evaluate_object(drive->acpidata->obj_handle, "_GTF",
 318                                       NULL, &output);
 319         if (ACPI_FAILURE(status)) {
 320                 printk(KERN_DEBUG
 321                        "%s: Run _GTF error: status = 0x%x\n",
 322                        __FUNCTION__, status);
 323                 goto out;
 324         }
 325
 326         if (!output.length || !output.pointer) {
 327                 DEBPRINT("Run _GTF: "
 328                        "length or ptr is NULL (0x%llx, 0x%p)\n",
 329                        (unsigned long long)output.length,
 330                        output.pointer);
 331                 goto out;
 332         }
 333
 334         out_obj = output.pointer;
 335         if (out_obj->type != ACPI_TYPE_BUFFER) {
 336                 DEBPRINT("Run _GTF: error: "
 337                        "expected object type of ACPI_TYPE_BUFFER, "
 338                        "got 0x%x\n", out_obj->type);
 339                 err = -ENOENT;
 340                 kfree(output.pointer);
 341                 goto out;
 342         }
 343
 344         if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
 345             out_obj->buffer.length % REGS_PER_GTF) {
 346                 printk(KERN_ERR
 347                        "%s: unexpected GTF length (%d) or addr (0x%p)\n",
 348                        __FUNCTION__, out_obj->buffer.length,
 349                        out_obj->buffer.pointer);
 350                 err = -ENOENT;
 351                 kfree(output.pointer);
 352                 goto out;
 353         }
 354
 355         *gtf_length = out_obj->buffer.length;
 356         *gtf_address = (unsigned long)out_obj->buffer.pointer;
 357         *obj_loc = (unsigned long)out_obj;
 358         DEBPRINT("returning gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
 359                  *gtf_length, *gtf_address, *obj_loc);
 360         err = 0;
 361 out:
 362         return err;
 363 }
 364
 365 /**
 366  * taskfile_load_raw - send taskfile registers to drive
 367  * @drive: drive to which output is sent
 368  * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
 369  *
 370  * Outputs IDE taskfile to the drive.
 371  */
 372 static int taskfile_load_raw(ide_drive_t *drive,
 373                               const struct taskfile_array *gtf)
 374 {
 375         ide_task_t args;
 376         int err = 0;
 377
 378         DEBPRINT("(0x1f1-1f7): hex: "
 379                "%02x %02x %02x %02x %02x %02x %02x\n",
 380                gtf->tfa[0], gtf->tfa[1], gtf->tfa[2],
 381                gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]);
 382
 383         memset(&args, 0, sizeof(ide_task_t));
 384         args.command_type = IDE_DRIVE_TASK_NO_DATA;
 385         args.data_phase   = TASKFILE_NO_DATA;
 386         args.handler      = &task_no_data_intr;
 387
 388         /* convert gtf to IDE Taskfile */
 389         args.tfRegister[1] = gtf->tfa[0];       /* 0x1f1 */
 390         args.tfRegister[2] = gtf->tfa[1];       /* 0x1f2 */
 391         args.tfRegister[3] = gtf->tfa[2];       /* 0x1f3 */
 392         args.tfRegister[4] = gtf->tfa[3];       /* 0x1f4 */
 393         args.tfRegister[5] = gtf->tfa[4];       /* 0x1f5 */
 394         args.tfRegister[6] = gtf->tfa[5];       /* 0x1f6 */
 395         args.tfRegister[7] = gtf->tfa[6];       /* 0x1f7 */
 396
 397         if (ide_noacpitfs) {
 398                 DEBPRINT("_GTF execution disabled\n");
 399                 return err;
 400         }
 401
 402         err = ide_raw_taskfile(drive, &args, NULL);
 403         if (err)
 404                 printk(KERN_ERR "%s: ide_raw_taskfile failed: %u\n",
 405                        __FUNCTION__, err);
 406
 407         return err;
 408 }
 409
 410 /**
 411  * do_drive_set_taskfiles - write the drive taskfile settings from _GTF
 412  * @drive: the drive to which the taskfile command should be sent
 413  * @gtf_length: total number of bytes of _GTF taskfiles
 414  * @gtf_address: location of _GTF taskfile arrays
 415  *
 416  * Write {gtf_address, length gtf_length} in groups of
 417  * REGS_PER_GTF bytes.
 418  */
 419 static int do_drive_set_taskfiles(ide_drive_t *drive,
 420                                   unsigned int gtf_length,
 421                                   unsigned long gtf_address)
 422 {
 423         int                     rc = -ENODEV, err;
 424         int                     gtf_count = gtf_length / REGS_PER_GTF;
 425         int                     ix;
 426         struct taskfile_array   *gtf;
 427
 428         if (ide_noacpi)
 429                 return 0;
 430
 431         DEBPRINT("ENTER: %s, hard_port#: %d\n", drive->name, drive->dn);
 432
 433         if (!drive->present)
 434                 goto out;
 435         if (!gtf_count)         /* shouldn't be here */
 436                 goto out;
 437
 438         DEBPRINT("total GTF bytes=%u (0x%x), gtf_count=%d, addr=0x%lx\n",
 439                  gtf_length, gtf_length, gtf_count, gtf_address);
 440
 441         if (gtf_length % REGS_PER_GTF) {
 442                 printk(KERN_ERR "%s: unexpected GTF length (%d)\n",
 443                        __FUNCTION__, gtf_length);
 444                 goto out;
 445         }
 446
 447         rc = 0;
 448         for (ix = 0; ix < gtf_count; ix++) {
 449                 gtf = (struct taskfile_array *)
 450                         (gtf_address + ix * REGS_PER_GTF);
 451
 452                 /* send all TaskFile registers (0x1f1-0x1f7) *in*that*order* */
 453                 err = taskfile_load_raw(drive, gtf);
 454                 if (err)
 455                         rc = err;
 456         }
 457
 458 out:
 459         return rc;
 460 }
 461
 462 /**
 463  * ide_acpi_exec_tfs - get then write drive taskfile settings
 464  * @drive: the drive for which the taskfile settings should be
 465  *         written.
 466  *
 467  * According to the ACPI spec this should be called after _STM
 468  * has been evaluated for the interface. Some ACPI vendors interpret
 469  * that as a hard requirement and modify the taskfile according
 470  * to the Identify Drive information passed down with _STM.
 471  * So one should really make sure to call this only after _STM has
 472  * been executed.
 473  */
 474 int ide_acpi_exec_tfs(ide_drive_t *drive)
 475 {
 476         int             ret;
 477         unsigned int    gtf_length;
 478         unsigned long   gtf_address;
 479         unsigned long   obj_loc;
 480
 481         if (ide_noacpi)
 482                 return 0;
 483
 484         DEBPRINT("call get_GTF, drive=%s port=%d\n", drive->name, drive->dn);
 485
 486         ret = do_drive_get_GTF(drive, &gtf_length, &gtf_address, &obj_loc);
 487         if (ret < 0) {
 488                 DEBPRINT("get_GTF error (%d)\n", ret);
 489                 return ret;
 490         }
 491
 492         DEBPRINT("call set_taskfiles, drive=%s\n", drive->name);
 493
 494         ret = do_drive_set_taskfiles(drive, gtf_length, gtf_address);
 495         kfree((void *)obj_loc);
 496         if (ret < 0) {
 497                 DEBPRINT("set_taskfiles error (%d)\n", ret);
 498         }
 499
 500         DEBPRINT("ret=%d\n", ret);
 501
 502         return ret;
 503 }
 504 EXPORT_SYMBOL_GPL(ide_acpi_exec_tfs);
 505
 506 /**
 507  * ide_acpi_get_timing - get the channel (controller) timings
 508  * @hwif: target IDE interface (channel)
 509  *
 510  * This function executes the _GTM ACPI method for the target channel.
 511  *
 512  */
 513 void ide_acpi_get_timing(ide_hwif_t *hwif)
 514 {
 515         acpi_status             status;
 516         struct acpi_buffer      output;
 517         union acpi_object       *out_obj;
 518
 519         if (ide_noacpi)
 520                 return;
 521
 522         DEBPRINT("ENTER:\n");
 523
 524         if (!hwif->acpidata) {
 525                 DEBPRINT("no ACPI data for %s\n", hwif->name);
 526                 return;
 527         }
 528
 529         /* Setting up output buffer for _GTM */
 530         output.length = ACPI_ALLOCATE_BUFFER;
 531         output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
 532
 533         /* _GTM has no input parameters */
 534         status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_GTM",
 535                                       NULL, &output);
 536
 537         DEBPRINT("_GTM status: %d, outptr: 0x%p, outlen: 0x%llx\n",
 538                  status, output.pointer,
 539                  (unsigned long long)output.length);
 540
 541         if (ACPI_FAILURE(status)) {
 542                 DEBPRINT("Run _GTM error: status = 0x%x\n", status);
 543                 return;
 544         }
 545
 546         if (!output.length || !output.pointer) {
 547                 DEBPRINT("Run _GTM: length or ptr is NULL (0x%llx, 0x%p)\n",
 548                        (unsigned long long)output.length,
 549                        output.pointer);
 550                 kfree(output.pointer);
 551                 return;
 552         }
 553
 554         out_obj = output.pointer;
 555         if (out_obj->type != ACPI_TYPE_BUFFER) {
 556                 kfree(output.pointer);
 557                 DEBPRINT("Run _GTM: error: "
 558                        "expected object type of ACPI_TYPE_BUFFER, "
 559                        "got 0x%x\n", out_obj->type);
 560                 return;
 561         }
 562
 563         if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
 564             out_obj->buffer.length != sizeof(struct GTM_buffer)) {
 565                 kfree(output.pointer);
 566                 printk(KERN_ERR
 567                         "%s: unexpected _GTM length (0x%x)[should be 0x%zx] or "
 568                         "addr (0x%p)\n",
 569                         __FUNCTION__, out_obj->buffer.length,
 570                         sizeof(struct GTM_buffer), out_obj->buffer.pointer);
 571                 return;
 572         }
 573
 574         memcpy(&hwif->acpidata->gtm, out_obj->buffer.pointer,
 575                sizeof(struct GTM_buffer));
 576
 577         DEBPRINT("_GTM info: ptr: 0x%p, len: 0x%x, exp.len: 0x%Zx\n",
 578                  out_obj->buffer.pointer, out_obj->buffer.length,
 579                  sizeof(struct GTM_buffer));
 580
 581         DEBPRINT("_GTM fields: 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n",
 582                  hwif->acpidata->gtm.PIO_speed0,
 583                  hwif->acpidata->gtm.DMA_speed0,
 584                  hwif->acpidata->gtm.PIO_speed1,
 585                  hwif->acpidata->gtm.DMA_speed1,
 586                  hwif->acpidata->gtm.GTM_flags);
 587
 588         kfree(output.pointer);
 589 }
 590 EXPORT_SYMBOL_GPL(ide_acpi_get_timing);
 591
 592 /**
 593  * ide_acpi_push_timing - set the channel (controller) timings
 594  * @hwif: target IDE interface (channel)
 595  *
 596  * This function executes the _STM ACPI method for the target channel.
 597  *
 598  * _STM requires Identify Drive data, which has to passed as an argument.
 599  * Unfortunately hd_driveid is a mangled version which we can't readily
 600  * use; hence we'll get the information afresh.
 601  */
 602 void ide_acpi_push_timing(ide_hwif_t *hwif)
 603 {
 604         acpi_status             status;
 605         struct acpi_object_list input;
 606         union acpi_object       in_params[3];
 607         struct ide_acpi_drive_link      *master = &hwif->acpidata->master;
 608         struct ide_acpi_drive_link      *slave = &hwif->acpidata->slave;
 609
 610         if (ide_noacpi)
 611                 return;
 612
 613         DEBPRINT("ENTER:\n");
 614
 615         if (!hwif->acpidata) {
 616                 DEBPRINT("no ACPI data for %s\n", hwif->name);
 617                 return;
 618         }
 619
 620         /* Give the GTM buffer + drive Identify data to the channel via the
 621          * _STM method: */
 622         /* setup input parameters buffer for _STM */
 623         input.count = 3;
 624         input.pointer = in_params;
 625         in_params[0].type = ACPI_TYPE_BUFFER;
 626         in_params[0].buffer.length = sizeof(struct GTM_buffer);
 627         in_params[0].buffer.pointer = (u8 *)&hwif->acpidata->gtm;
 628         in_params[1].type = ACPI_TYPE_BUFFER;
 629         in_params[1].buffer.length = sizeof(struct hd_driveid);
 630         in_params[1].buffer.pointer = (u8 *)&master->idbuff;
 631         in_params[2].type = ACPI_TYPE_BUFFER;
 632         in_params[2].buffer.length = sizeof(struct hd_driveid);
 633         in_params[2].buffer.pointer = (u8 *)&slave->idbuff;
 634         /* Output buffer: _STM has no output */
 635
 636         status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_STM",
 637                                       &input, NULL);
 638
 639         if (ACPI_FAILURE(status)) {
 640                 DEBPRINT("Run _STM error: status = 0x%x\n", status);
 641         }
 642         DEBPRINT("_STM status: %d\n", status);
 643 }
 644 EXPORT_SYMBOL_GPL(ide_acpi_push_timing);
 645
 646 /**
 647  * ide_acpi_set_state - set the channel power state
 648  * @hwif: target IDE interface
 649  * @on: state, on/off
 650  *
 651  * This function executes the _PS0/_PS3 ACPI method to set the power state.
 652  * ACPI spec requires _PS0 when IDE power on and _PS3 when power off
 653  */
 654 void ide_acpi_set_state(ide_hwif_t *hwif, int on)
 655 {
 656         int unit;
 657
 658         if (ide_noacpi || ide_noacpi_psx)
 659                 return;
 660
 661         DEBPRINT("ENTER:\n");
 662
 663         if (!hwif->acpidata) {
 664                 DEBPRINT("no ACPI data for %s\n", hwif->name);
 665                 return;
 666         }
 667         /* channel first and then drives for power on and verse versa for power off */
 668         if (on)
 669                 acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0);
 670         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 671                 ide_drive_t *drive = &hwif->drives[unit];
 672
 673                 if (!drive->acpidata->obj_handle)
 674                         drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive);
 675
 676                 if (drive->acpidata->obj_handle && drive->present) {
 677                         acpi_bus_set_power(drive->acpidata->obj_handle,
 678                                 on? ACPI_STATE_D0: ACPI_STATE_D3);
 679                 }
 680         }
 681         if (!on)
 682                 acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D3);
 683 }
 684
 685 /**
 686  * ide_acpi_init - initialize the ACPI link for an IDE interface
 687  * @hwif: target IDE interface (channel)
 688  *
 689  * The ACPI spec is not quite clear when the drive identify buffer
 690  * should be obtained. Calling IDENTIFY DEVICE during shutdown
 691  * is not the best of ideas as the drive might already being put to
 692  * sleep. And obviously we can't call it during resume.
 693  * So we get the information during startup; but this means that
 694  * any changes during run-time will be lost after resume.
 695  */
 696 void ide_acpi_init(ide_hwif_t *hwif)
 697 {
 698         int unit;
 699         int                     err;
 700         struct ide_acpi_drive_link      *master;
 701         struct ide_acpi_drive_link      *slave;
 702
 703         ide_acpi_blacklist();
 704
 705         hwif->acpidata = kzalloc(sizeof(struct ide_acpi_hwif_link), GFP_KERNEL);
 706         if (!hwif->acpidata)
 707                 return;
 708
 709         hwif->acpidata->obj_handle = ide_acpi_hwif_get_handle(hwif);
 710         if (!hwif->acpidata->obj_handle) {
 711                 DEBPRINT("no ACPI object for %s found\n", hwif->name);
 712                 kfree(hwif->acpidata);
 713                 hwif->acpidata = NULL;
 714                 return;
 715         }
 716
 717         /*
 718          * The ACPI spec mandates that we send information
 719          * for both drives, regardless whether they are connected
 720          * or not.
 721          */
 722         hwif->acpidata->master.drive = &hwif->drives[0];
 723         hwif->drives[0].acpidata = &hwif->acpidata->master;
 724         master = &hwif->acpidata->master;
 725
 726         hwif->acpidata->slave.drive = &hwif->drives[1];
 727         hwif->drives[1].acpidata = &hwif->acpidata->slave;
 728         slave = &hwif->acpidata->slave;
 729
 730
 731         /*
 732          * Send IDENTIFY for each drive
 733          */
 734         if (master->drive->present) {
 735                 err = taskfile_lib_get_identify(master->drive, master->idbuff);
 736                 if (err) {
 737                         DEBPRINT("identify device %s failed (%d)\n",
 738                                  master->drive->name, err);
 739                 }
 740         }
 741
 742         if (slave->drive->present) {
 743                 err = taskfile_lib_get_identify(slave->drive, slave->idbuff);
 744                 if (err) {
 745                         DEBPRINT("identify device %s failed (%d)\n",
 746                                  slave->drive->name, err);
 747                 }
 748         }
 749
 750         if (ide_noacpionboot) {
 751                 DEBPRINT("ACPI methods disabled on boot\n");
 752                 return;
 753         }
 754
 755         /* ACPI _PS0 before _STM */
 756         ide_acpi_set_state(hwif, 1);
 757         /*
 758          * ACPI requires us to call _STM on startup
 759          */
 760         ide_acpi_get_timing(hwif);
 761         ide_acpi_push_timing(hwif);
 762
 763         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 764                 ide_drive_t *drive = &hwif->drives[unit];
 765
 766                 if (drive->present) {
 767                         /* Execute ACPI startup code */
 768                         ide_acpi_exec_tfs(drive);
 769                 }
 770         }
 771 }
 772 EXPORT_SYMBOL_GPL(ide_acpi_init);