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 <linux/slab.h>
  16 #include <acpi/acpi.h>
  17 #include <linux/ide.h>
  18 #include <linux/pci.h>
  19 #include <linux/dmi.h>
  20 #include <linux/module.h>
  21
  22 #include <acpi/acpi_bus.h>
  23
  24 #define REGS_PER_GTF            7
  25
  26 struct GTM_buffer {
  27         u32     PIO_speed0;
  28         u32     DMA_speed0;
  29         u32     PIO_speed1;
  30         u32     DMA_speed1;
  31         u32     GTM_flags;
  32 };
  33
  34 struct ide_acpi_drive_link {
  35         acpi_handle      obj_handle;
  36         u8               idbuff[512];
  37 };
  38
  39 struct ide_acpi_hwif_link {
  40         ide_hwif_t                      *hwif;
  41         acpi_handle                      obj_handle;
  42         struct GTM_buffer                gtm;
  43         struct ide_acpi_drive_link       master;
  44         struct ide_acpi_drive_link       slave;
  45 };
  46
  47 #undef DEBUGGING
  48 /* note: adds function name and KERN_DEBUG */
  49 #ifdef DEBUGGING
  50 #define DEBPRINT(fmt, args...)  \
  51                 printk(KERN_DEBUG "%s: " fmt, __func__, ## args)
  52 #else
  53 #define DEBPRINT(fmt, args...)  do {} while (0)
  54 #endif  /* DEBUGGING */
  55
  56 static bool ide_noacpi;
  57 module_param_named(noacpi, ide_noacpi, bool, 0);
  58 MODULE_PARM_DESC(noacpi, "disable IDE ACPI support");
  59
  60 static bool ide_acpigtf;
  61 module_param_named(acpigtf, ide_acpigtf, bool, 0);
  62 MODULE_PARM_DESC(acpigtf, "enable IDE ACPI _GTF support");
  63
  64 static bool ide_acpionboot;
  65 module_param_named(acpionboot, ide_acpionboot, bool, 0);
  66 MODULE_PARM_DESC(acpionboot, "call IDE ACPI methods on boot");
  67
  68 static bool ide_noacpi_psx;
  69 static int no_acpi_psx(const struct dmi_system_id *id)
  70 {
  71         ide_noacpi_psx = true;
  72         printk(KERN_NOTICE"%s detected - disable ACPI _PSx.\n", id->ident);
  73         return 0;
  74 }
  75
  76 static const struct dmi_system_id ide_acpi_dmi_table[] = {
  77         /* Bug 9673. */
  78         /* We should check if this is because ACPI NVS isn't save/restored. */
  79         {
  80                 .callback = no_acpi_psx,
  81                 .ident    = "HP nx9005",
  82                 .matches  = {
  83                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies Ltd."),
  84                         DMI_MATCH(DMI_BIOS_VERSION, "KAM1.60")
  85                 },
  86         },
  87
  88         { }     /* terminate list */
  89 };
  90
  91 int ide_acpi_init(void)
  92 {
  93         dmi_check_system(ide_acpi_dmi_table);
  94         return 0;
  95 }
  96
  97 bool ide_port_acpi(ide_hwif_t *hwif)
  98 {
  99         return ide_noacpi == 0 && hwif->acpidata;
 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  */
 112 static int ide_get_dev_handle(struct device *dev, acpi_handle *handle,
 113                                u64 *pcidevfn)
 114 {
 115         struct pci_dev *pdev = to_pci_dev(dev);
 116         unsigned int bus, devnum, func;
 117         u64 addr;
 118         acpi_handle dev_handle;
 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 = (u64)(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, &dinfo);
 138         if (ACPI_FAILURE(status)) {
 139                 DEBPRINT("get_object_info for device failed\n");
 140                 goto err;
 141         }
 142         if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
 143             dinfo->address == addr) {
 144                 *pcidevfn = addr;
 145                 *handle = dev_handle;
 146         } else {
 147                 DEBPRINT("get_object_info for device has wrong "
 148                         " address: %llu, should be %u\n",
 149                         dinfo ? (unsigned long long)dinfo->address : -1ULL,
 150                         (unsigned int)addr);
 151                 goto err;
 152         }
 153
 154         DEBPRINT("for dev=0x%x.%x, addr=0x%llx, *handle=0x%p\n",
 155                  devnum, func, (unsigned long long)addr, *handle);
 156         ret = 0;
 157 err:
 158         kfree(dinfo);
 159         return ret;
 160 }
 161
 162 /**
 163  * ide_acpi_hwif_get_handle - Get ACPI object handle for a given hwif
 164  * @hwif: device to locate
 165  *
 166  * Retrieves the object handle for a given hwif.
 167  *
 168  * Returns handle on success, 0 on error.
 169  */
 170 static acpi_handle ide_acpi_hwif_get_handle(ide_hwif_t *hwif)
 171 {
 172         struct device           *dev = hwif->gendev.parent;
 173         acpi_handle             uninitialized_var(dev_handle);
 174         u64                     pcidevfn;
 175         acpi_handle             chan_handle;
 176         int                     err;
 177
 178         DEBPRINT("ENTER: device %s\n", hwif->name);
 179
 180         if (!dev) {
 181                 DEBPRINT("no PCI device for %s\n", hwif->name);
 182                 return NULL;
 183         }
 184
 185         err = ide_get_dev_handle(dev, &dev_handle, &pcidevfn);
 186         if (err < 0) {
 187                 DEBPRINT("ide_get_dev_handle failed (%d)\n", err);
 188                 return NULL;
 189         }
 190
 191         /* get child objects of dev_handle == channel objects,
 192          * + _their_ children == drive objects */
 193         /* channel is hwif->channel */
 194         chan_handle = acpi_get_child(dev_handle, hwif->channel);
 195         DEBPRINT("chan adr=%d: handle=0x%p\n",
 196                  hwif->channel, chan_handle);
 197
 198         return chan_handle;
 199 }
 200
 201 /**
 202  * do_drive_get_GTF - get the drive bootup default taskfile settings
 203  * @drive: the drive for which the taskfile settings should be retrieved
 204  * @gtf_length: number of bytes of _GTF data returned at @gtf_address
 205  * @gtf_address: buffer containing _GTF taskfile arrays
 206  *
 207  * The _GTF method has no input parameters.
 208  * It returns a variable number of register set values (registers
 209  * hex 1F1..1F7, taskfiles).
 210  * The <variable number> is not known in advance, so have ACPI-CA
 211  * allocate the buffer as needed and return it, then free it later.
 212  *
 213  * The returned @gtf_length and @gtf_address are only valid if the
 214  * function return value is 0.
 215  */
 216 static int do_drive_get_GTF(ide_drive_t *drive,
 217                      unsigned int *gtf_length, unsigned long *gtf_address,
 218                      unsigned long *obj_loc)
 219 {
 220         acpi_status                     status;
 221         struct acpi_buffer              output;
 222         union acpi_object               *out_obj;
 223         int                             err = -ENODEV;
 224
 225         *gtf_length = 0;
 226         *gtf_address = 0UL;
 227         *obj_loc = 0UL;
 228
 229         if (!drive->acpidata->obj_handle) {
 230                 DEBPRINT("No ACPI object found for %s\n", drive->name);
 231                 goto out;
 232         }
 233
 234         /* Setting up output buffer */
 235         output.length = ACPI_ALLOCATE_BUFFER;
 236         output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
 237
 238         /* _GTF has no input parameters */
 239         err = -EIO;
 240         status = acpi_evaluate_object(drive->acpidata->obj_handle, "_GTF",
 241                                       NULL, &output);
 242         if (ACPI_FAILURE(status)) {
 243                 printk(KERN_DEBUG
 244                        "%s: Run _GTF error: status = 0x%x\n",
 245                        __func__, status);
 246                 goto out;
 247         }
 248
 249         if (!output.length || !output.pointer) {
 250                 DEBPRINT("Run _GTF: "
 251                        "length or ptr is NULL (0x%llx, 0x%p)\n",
 252                        (unsigned long long)output.length,
 253                        output.pointer);
 254                 goto out;
 255         }
 256
 257         out_obj = output.pointer;
 258         if (out_obj->type != ACPI_TYPE_BUFFER) {
 259                 DEBPRINT("Run _GTF: error: "
 260                        "expected object type of ACPI_TYPE_BUFFER, "
 261                        "got 0x%x\n", out_obj->type);
 262                 err = -ENOENT;
 263                 kfree(output.pointer);
 264                 goto out;
 265         }
 266
 267         if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
 268             out_obj->buffer.length % REGS_PER_GTF) {
 269                 printk(KERN_ERR
 270                        "%s: unexpected GTF length (%d) or addr (0x%p)\n",
 271                        __func__, out_obj->buffer.length,
 272                        out_obj->buffer.pointer);
 273                 err = -ENOENT;
 274                 kfree(output.pointer);
 275                 goto out;
 276         }
 277
 278         *gtf_length = out_obj->buffer.length;
 279         *gtf_address = (unsigned long)out_obj->buffer.pointer;
 280         *obj_loc = (unsigned long)out_obj;
 281         DEBPRINT("returning gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
 282                  *gtf_length, *gtf_address, *obj_loc);
 283         err = 0;
 284 out:
 285         return err;
 286 }
 287
 288 /**
 289  * do_drive_set_taskfiles - write the drive taskfile settings from _GTF
 290  * @drive: the drive to which the taskfile command should be sent
 291  * @gtf_length: total number of bytes of _GTF taskfiles
 292  * @gtf_address: location of _GTF taskfile arrays
 293  *
 294  * Write {gtf_address, length gtf_length} in groups of
 295  * REGS_PER_GTF bytes.
 296  */
 297 static int do_drive_set_taskfiles(ide_drive_t *drive,
 298                                   unsigned int gtf_length,
 299                                   unsigned long gtf_address)
 300 {
 301         int                     rc = 0, err;
 302         int                     gtf_count = gtf_length / REGS_PER_GTF;
 303         int                     ix;
 304
 305         DEBPRINT("total GTF bytes=%u (0x%x), gtf_count=%d, addr=0x%lx\n",
 306                  gtf_length, gtf_length, gtf_count, gtf_address);
 307
 308         /* send all taskfile registers (0x1f1-0x1f7) *in*that*order* */
 309         for (ix = 0; ix < gtf_count; ix++) {
 310                 u8 *gtf = (u8 *)(gtf_address + ix * REGS_PER_GTF);
 311                 struct ide_cmd cmd;
 312
 313                 DEBPRINT("(0x1f1-1f7): "
 314                          "hex: %02x %02x %02x %02x %02x %02x %02x\n",
 315                          gtf[0], gtf[1], gtf[2],
 316                          gtf[3], gtf[4], gtf[5], gtf[6]);
 317
 318                 if (!ide_acpigtf) {
 319                         DEBPRINT("_GTF execution disabled\n");
 320                         continue;
 321                 }
 322
 323                 /* convert GTF to taskfile */
 324                 memset(&cmd, 0, sizeof(cmd));
 325                 memcpy(&cmd.tf.feature, gtf, REGS_PER_GTF);
 326                 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
 327                 cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 328
 329                 err = ide_no_data_taskfile(drive, &cmd);
 330                 if (err) {
 331                         printk(KERN_ERR "%s: ide_no_data_taskfile failed: %u\n",
 332                                         __func__, err);
 333                         rc = err;
 334                 }
 335         }
 336
 337         return rc;
 338 }
 339
 340 /**
 341  * ide_acpi_exec_tfs - get then write drive taskfile settings
 342  * @drive: the drive for which the taskfile settings should be
 343  *         written.
 344  *
 345  * According to the ACPI spec this should be called after _STM
 346  * has been evaluated for the interface. Some ACPI vendors interpret
 347  * that as a hard requirement and modify the taskfile according
 348  * to the Identify Drive information passed down with _STM.
 349  * So one should really make sure to call this only after _STM has
 350  * been executed.
 351  */
 352 int ide_acpi_exec_tfs(ide_drive_t *drive)
 353 {
 354         int             ret;
 355         unsigned int    gtf_length;
 356         unsigned long   gtf_address;
 357         unsigned long   obj_loc;
 358
 359         DEBPRINT("call get_GTF, drive=%s port=%d\n", drive->name, drive->dn);
 360
 361         ret = do_drive_get_GTF(drive, &gtf_length, &gtf_address, &obj_loc);
 362         if (ret < 0) {
 363                 DEBPRINT("get_GTF error (%d)\n", ret);
 364                 return ret;
 365         }
 366
 367         DEBPRINT("call set_taskfiles, drive=%s\n", drive->name);
 368
 369         ret = do_drive_set_taskfiles(drive, gtf_length, gtf_address);
 370         kfree((void *)obj_loc);
 371         if (ret < 0) {
 372                 DEBPRINT("set_taskfiles error (%d)\n", ret);
 373         }
 374
 375         DEBPRINT("ret=%d\n", ret);
 376
 377         return ret;
 378 }
 379
 380 /**
 381  * ide_acpi_get_timing - get the channel (controller) timings
 382  * @hwif: target IDE interface (channel)
 383  *
 384  * This function executes the _GTM ACPI method for the target channel.
 385  *
 386  */
 387 void ide_acpi_get_timing(ide_hwif_t *hwif)
 388 {
 389         acpi_status             status;
 390         struct acpi_buffer      output;
 391         union acpi_object       *out_obj;
 392
 393         /* Setting up output buffer for _GTM */
 394         output.length = ACPI_ALLOCATE_BUFFER;
 395         output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
 396
 397         /* _GTM has no input parameters */
 398         status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_GTM",
 399                                       NULL, &output);
 400
 401         DEBPRINT("_GTM status: %d, outptr: 0x%p, outlen: 0x%llx\n",
 402                  status, output.pointer,
 403                  (unsigned long long)output.length);
 404
 405         if (ACPI_FAILURE(status)) {
 406                 DEBPRINT("Run _GTM error: status = 0x%x\n", status);
 407                 return;
 408         }
 409
 410         if (!output.length || !output.pointer) {
 411                 DEBPRINT("Run _GTM: length or ptr is NULL (0x%llx, 0x%p)\n",
 412                        (unsigned long long)output.length,
 413                        output.pointer);
 414                 kfree(output.pointer);
 415                 return;
 416         }
 417
 418         out_obj = output.pointer;
 419         if (out_obj->type != ACPI_TYPE_BUFFER) {
 420                 DEBPRINT("Run _GTM: error: "
 421                        "expected object type of ACPI_TYPE_BUFFER, "
 422                        "got 0x%x\n", out_obj->type);
 423                 kfree(output.pointer);
 424                 return;
 425         }
 426
 427         if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
 428             out_obj->buffer.length != sizeof(struct GTM_buffer)) {
 429                 printk(KERN_ERR
 430                         "%s: unexpected _GTM length (0x%x)[should be 0x%zx] or "
 431                         "addr (0x%p)\n",
 432                         __func__, out_obj->buffer.length,
 433                         sizeof(struct GTM_buffer), out_obj->buffer.pointer);
 434                 kfree(output.pointer);
 435                 return;
 436         }
 437
 438         memcpy(&hwif->acpidata->gtm, out_obj->buffer.pointer,
 439                sizeof(struct GTM_buffer));
 440
 441         DEBPRINT("_GTM info: ptr: 0x%p, len: 0x%x, exp.len: 0x%Zx\n",
 442                  out_obj->buffer.pointer, out_obj->buffer.length,
 443                  sizeof(struct GTM_buffer));
 444
 445         DEBPRINT("_GTM fields: 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n",
 446                  hwif->acpidata->gtm.PIO_speed0,
 447                  hwif->acpidata->gtm.DMA_speed0,
 448                  hwif->acpidata->gtm.PIO_speed1,
 449                  hwif->acpidata->gtm.DMA_speed1,
 450                  hwif->acpidata->gtm.GTM_flags);
 451
 452         kfree(output.pointer);
 453 }
 454
 455 /**
 456  * ide_acpi_push_timing - set the channel (controller) timings
 457  * @hwif: target IDE interface (channel)
 458  *
 459  * This function executes the _STM ACPI method for the target channel.
 460  *
 461  * _STM requires Identify Drive data, which has to passed as an argument.
 462  * Unfortunately drive->id is a mangled version which we can't readily
 463  * use; hence we'll get the information afresh.
 464  */
 465 void ide_acpi_push_timing(ide_hwif_t *hwif)
 466 {
 467         acpi_status             status;
 468         struct acpi_object_list input;
 469         union acpi_object       in_params[3];
 470         struct ide_acpi_drive_link      *master = &hwif->acpidata->master;
 471         struct ide_acpi_drive_link      *slave = &hwif->acpidata->slave;
 472
 473         /* Give the GTM buffer + drive Identify data to the channel via the
 474          * _STM method: */
 475         /* setup input parameters buffer for _STM */
 476         input.count = 3;
 477         input.pointer = in_params;
 478         in_params[0].type = ACPI_TYPE_BUFFER;
 479         in_params[0].buffer.length = sizeof(struct GTM_buffer);
 480         in_params[0].buffer.pointer = (u8 *)&hwif->acpidata->gtm;
 481         in_params[1].type = ACPI_TYPE_BUFFER;
 482         in_params[1].buffer.length = ATA_ID_WORDS * 2;
 483         in_params[1].buffer.pointer = (u8 *)&master->idbuff;
 484         in_params[2].type = ACPI_TYPE_BUFFER;
 485         in_params[2].buffer.length = ATA_ID_WORDS * 2;
 486         in_params[2].buffer.pointer = (u8 *)&slave->idbuff;
 487         /* Output buffer: _STM has no output */
 488
 489         status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_STM",
 490                                       &input, NULL);
 491
 492         if (ACPI_FAILURE(status)) {
 493                 DEBPRINT("Run _STM error: status = 0x%x\n", status);
 494         }
 495         DEBPRINT("_STM status: %d\n", status);
 496 }
 497
 498 /**
 499  * ide_acpi_set_state - set the channel power state
 500  * @hwif: target IDE interface
 501  * @on: state, on/off
 502  *
 503  * This function executes the _PS0/_PS3 ACPI method to set the power state.
 504  * ACPI spec requires _PS0 when IDE power on and _PS3 when power off
 505  */
 506 void ide_acpi_set_state(ide_hwif_t *hwif, int on)
 507 {
 508         ide_drive_t *drive;
 509         int i;
 510
 511         if (ide_noacpi_psx)
 512                 return;
 513
 514         DEBPRINT("ENTER:\n");
 515
 516         /* channel first and then drives for power on and verse versa for power off */
 517         if (on)
 518                 acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0);
 519
 520         ide_port_for_each_present_dev(i, drive, hwif) {
 521                 if (drive->acpidata->obj_handle)
 522                         acpi_bus_set_power(drive->acpidata->obj_handle,
 523                                            on ? ACPI_STATE_D0 : ACPI_STATE_D3);
 524         }
 525
 526         if (!on)
 527                 acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D3);
 528 }
 529
 530 /**
 531  * ide_acpi_init_port - initialize the ACPI link for an IDE interface
 532  * @hwif: target IDE interface (channel)
 533  *
 534  * The ACPI spec is not quite clear when the drive identify buffer
 535  * should be obtained. Calling IDENTIFY DEVICE during shutdown
 536  * is not the best of ideas as the drive might already being put to
 537  * sleep. And obviously we can't call it during resume.
 538  * So we get the information during startup; but this means that
 539  * any changes during run-time will be lost after resume.
 540  */
 541 void ide_acpi_init_port(ide_hwif_t *hwif)
 542 {
 543         hwif->acpidata = kzalloc(sizeof(struct ide_acpi_hwif_link), GFP_KERNEL);
 544         if (!hwif->acpidata)
 545                 return;
 546
 547         hwif->acpidata->obj_handle = ide_acpi_hwif_get_handle(hwif);
 548         if (!hwif->acpidata->obj_handle) {
 549                 DEBPRINT("no ACPI object for %s found\n", hwif->name);
 550                 kfree(hwif->acpidata);
 551                 hwif->acpidata = NULL;
 552         }
 553 }
 554
 555 void ide_acpi_port_init_devices(ide_hwif_t *hwif)
 556 {
 557         ide_drive_t *drive;
 558         int i, err;
 559
 560         if (hwif->acpidata == NULL)
 561                 return;
 562
 563         /*
 564          * The ACPI spec mandates that we send information
 565          * for both drives, regardless whether they are connected
 566          * or not.
 567          */
 568         hwif->devices[0]->acpidata = &hwif->acpidata->master;
 569         hwif->devices[1]->acpidata = &hwif->acpidata->slave;
 570
 571         /* get _ADR info for each device */
 572         ide_port_for_each_present_dev(i, drive, hwif) {
 573                 acpi_handle dev_handle;
 574
 575                 DEBPRINT("ENTER: %s at channel#: %d port#: %d\n",
 576                          drive->name, hwif->channel, drive->dn & 1);
 577
 578                 /* TBD: could also check ACPI object VALID bits */
 579                 dev_handle = acpi_get_child(hwif->acpidata->obj_handle,
 580                                             drive->dn & 1);
 581
 582                 DEBPRINT("drive %s handle 0x%p\n", drive->name, dev_handle);
 583
 584                 drive->acpidata->obj_handle = dev_handle;
 585         }
 586
 587         /* send IDENTIFY for each device */
 588         ide_port_for_each_present_dev(i, drive, hwif) {
 589                 err = taskfile_lib_get_identify(drive, drive->acpidata->idbuff);
 590                 if (err)
 591                         DEBPRINT("identify device %s failed (%d)\n",
 592                                  drive->name, err);
 593         }
 594
 595         if (ide_noacpi || ide_acpionboot == 0) {
 596                 DEBPRINT("ACPI methods disabled on boot\n");
 597                 return;
 598         }
 599
 600         /* ACPI _PS0 before _STM */
 601         ide_acpi_set_state(hwif, 1);
 602         /*
 603          * ACPI requires us to call _STM on startup
 604          */
 605         ide_acpi_get_timing(hwif);
 606         ide_acpi_push_timing(hwif);
 607
 608         ide_port_for_each_present_dev(i, drive, hwif) {
 609                 ide_acpi_exec_tfs(drive);
 610         }
 611 }