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