ide-acpi.c revision 0e63a588fc3d6a5e6bb66bacaeb11cd9093141f8
1/* 2 * Provides ACPI support for IDE drives. 3 * 4 * Copyright (C) 2005 Intel Corp. 5 * Copyright (C) 2005 Randy Dunlap 6 * Copyright (C) 2006 SUSE Linux Products GmbH 7 * Copyright (C) 2006 Hannes Reinecke 8 */ 9 10#include <linux/ata.h> 11#include <linux/delay.h> 12#include <linux/device.h> 13#include <linux/errno.h> 14#include <linux/kernel.h> 15#include <acpi/acpi.h> 16#include <linux/ide.h> 17#include <linux/pci.h> 18#include <linux/dmi.h> 19 20#include <acpi/acpi_bus.h> 21#include <acpi/acnames.h> 22#include <acpi/acnamesp.h> 23#include <acpi/acparser.h> 24#include <acpi/acexcep.h> 25#include <acpi/acmacros.h> 26#include <acpi/actypes.h> 27 28#define REGS_PER_GTF 7 29struct taskfile_array { 30 u8 tfa[REGS_PER_GTF]; /* regs. 0x1f1 - 0x1f7 */ 31}; 32 33struct GTM_buffer { 34 u32 PIO_speed0; 35 u32 DMA_speed0; 36 u32 PIO_speed1; 37 u32 DMA_speed1; 38 u32 GTM_flags; 39}; 40 41struct ide_acpi_drive_link { 42 acpi_handle obj_handle; 43 u8 idbuff[512]; 44}; 45 46struct ide_acpi_hwif_link { 47 ide_hwif_t *hwif; 48 acpi_handle obj_handle; 49 struct GTM_buffer gtm; 50 struct ide_acpi_drive_link master; 51 struct ide_acpi_drive_link slave; 52}; 53 54#undef DEBUGGING 55/* note: adds function name and KERN_DEBUG */ 56#ifdef DEBUGGING 57#define DEBPRINT(fmt, args...) \ 58 printk(KERN_DEBUG "%s: " fmt, __func__, ## args) 59#else 60#define DEBPRINT(fmt, args...) do {} while (0) 61#endif /* DEBUGGING */ 62 63static int ide_noacpi; 64module_param_named(noacpi, ide_noacpi, bool, 0); 65MODULE_PARM_DESC(noacpi, "disable IDE ACPI support"); 66 67static int ide_acpigtf; 68module_param_named(acpigtf, ide_acpigtf, bool, 0); 69MODULE_PARM_DESC(acpigtf, "enable IDE ACPI _GTF support"); 70 71static int ide_acpionboot; 72module_param_named(acpionboot, ide_acpionboot, bool, 0); 73MODULE_PARM_DESC(acpionboot, "call IDE ACPI methods on boot"); 74 75static bool ide_noacpi_psx; 76static int no_acpi_psx(const struct dmi_system_id *id) 77{ 78 ide_noacpi_psx = true; 79 printk(KERN_NOTICE"%s detected - disable ACPI _PSx.\n", id->ident); 80 return 0; 81} 82 83static const struct dmi_system_id ide_acpi_dmi_table[] = { 84 /* Bug 9673. */ 85 /* We should check if this is because ACPI NVS isn't save/restored. */ 86 { 87 .callback = no_acpi_psx, 88 .ident = "HP nx9005", 89 .matches = { 90 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies Ltd."), 91 DMI_MATCH(DMI_BIOS_VERSION, "KAM1.60") 92 }, 93 }, 94 95 { } /* terminate list */ 96}; 97 98static int ide_acpi_blacklist(void) 99{ 100 static int done; 101 if (done) 102 return 0; 103 done = 1; 104 dmi_check_system(ide_acpi_dmi_table); 105 return 0; 106} 107 108/** 109 * ide_get_dev_handle - finds acpi_handle and PCI device.function 110 * @dev: device to locate 111 * @handle: returned acpi_handle for @dev 112 * @pcidevfn: return PCI device.func for @dev 113 * 114 * Returns the ACPI object handle to the corresponding PCI device. 115 * 116 * Returns 0 on success, <0 on error. 117 */ 118static int ide_get_dev_handle(struct device *dev, acpi_handle *handle, 119 acpi_integer *pcidevfn) 120{ 121 struct pci_dev *pdev = to_pci_dev(dev); 122 unsigned int bus, devnum, func; 123 acpi_integer addr; 124 acpi_handle dev_handle; 125 struct acpi_buffer buffer = {.length = ACPI_ALLOCATE_BUFFER, 126 .pointer = NULL}; 127 acpi_status status; 128 struct acpi_device_info *dinfo = NULL; 129 int ret = -ENODEV; 130 131 bus = pdev->bus->number; 132 devnum = PCI_SLOT(pdev->devfn); 133 func = PCI_FUNC(pdev->devfn); 134 /* ACPI _ADR encoding for PCI bus: */ 135 addr = (acpi_integer)(devnum << 16 | func); 136 137 DEBPRINT("ENTER: pci %02x:%02x.%01x\n", bus, devnum, func); 138 139 dev_handle = DEVICE_ACPI_HANDLE(dev); 140 if (!dev_handle) { 141 DEBPRINT("no acpi handle for device\n"); 142 goto err; 143 } 144 145 status = acpi_get_object_info(dev_handle, &buffer); 146 if (ACPI_FAILURE(status)) { 147 DEBPRINT("get_object_info for device failed\n"); 148 goto err; 149 } 150 dinfo = buffer.pointer; 151 if (dinfo && (dinfo->valid & ACPI_VALID_ADR) && 152 dinfo->address == addr) { 153 *pcidevfn = addr; 154 *handle = dev_handle; 155 } else { 156 DEBPRINT("get_object_info for device has wrong " 157 " address: %llu, should be %u\n", 158 dinfo ? (unsigned long long)dinfo->address : -1ULL, 159 (unsigned int)addr); 160 goto err; 161 } 162 163 DEBPRINT("for dev=0x%x.%x, addr=0x%llx, *handle=0x%p\n", 164 devnum, func, (unsigned long long)addr, *handle); 165 ret = 0; 166err: 167 kfree(dinfo); 168 return ret; 169} 170 171/** 172 * ide_acpi_hwif_get_handle - Get ACPI object handle for a given hwif 173 * @hwif: device to locate 174 * 175 * Retrieves the object handle for a given hwif. 176 * 177 * Returns handle on success, 0 on error. 178 */ 179static acpi_handle ide_acpi_hwif_get_handle(ide_hwif_t *hwif) 180{ 181 struct device *dev = hwif->gendev.parent; 182 acpi_handle uninitialized_var(dev_handle); 183 acpi_integer pcidevfn; 184 acpi_handle chan_handle; 185 int err; 186 187 DEBPRINT("ENTER: device %s\n", hwif->name); 188 189 if (!dev) { 190 DEBPRINT("no PCI device for %s\n", hwif->name); 191 return NULL; 192 } 193 194 err = ide_get_dev_handle(dev, &dev_handle, &pcidevfn); 195 if (err < 0) { 196 DEBPRINT("ide_get_dev_handle failed (%d)\n", err); 197 return NULL; 198 } 199 200 /* get child objects of dev_handle == channel objects, 201 * + _their_ children == drive objects */ 202 /* channel is hwif->channel */ 203 chan_handle = acpi_get_child(dev_handle, hwif->channel); 204 DEBPRINT("chan adr=%d: handle=0x%p\n", 205 hwif->channel, chan_handle); 206 207 return chan_handle; 208} 209 210/** 211 * ide_acpi_drive_get_handle - Get ACPI object handle for a given drive 212 * @drive: device to locate 213 * 214 * Retrieves the object handle of a given drive. According to the ACPI 215 * spec the drive is a child of the hwif. 216 * 217 * Returns handle on success, 0 on error. 218 */ 219static acpi_handle ide_acpi_drive_get_handle(ide_drive_t *drive) 220{ 221 ide_hwif_t *hwif = HWIF(drive); 222 int port; 223 acpi_handle drive_handle; 224 225 if (!hwif->acpidata) 226 return NULL; 227 228 if (!hwif->acpidata->obj_handle) 229 return NULL; 230 231 port = hwif->channel ? drive->dn - 2: drive->dn; 232 233 DEBPRINT("ENTER: %s at channel#: %d port#: %d\n", 234 drive->name, hwif->channel, port); 235 236 237 /* TBD: could also check ACPI object VALID bits */ 238 drive_handle = acpi_get_child(hwif->acpidata->obj_handle, port); 239 DEBPRINT("drive %s handle 0x%p\n", drive->name, drive_handle); 240 241 return drive_handle; 242} 243 244/** 245 * do_drive_get_GTF - get the drive bootup default taskfile settings 246 * @drive: the drive for which the taskfile settings should be retrieved 247 * @gtf_length: number of bytes of _GTF data returned at @gtf_address 248 * @gtf_address: buffer containing _GTF taskfile arrays 249 * 250 * The _GTF method has no input parameters. 251 * It returns a variable number of register set values (registers 252 * hex 1F1..1F7, taskfiles). 253 * The <variable number> is not known in advance, so have ACPI-CA 254 * allocate the buffer as needed and return it, then free it later. 255 * 256 * The returned @gtf_length and @gtf_address are only valid if the 257 * function return value is 0. 258 */ 259static int do_drive_get_GTF(ide_drive_t *drive, 260 unsigned int *gtf_length, unsigned long *gtf_address, 261 unsigned long *obj_loc) 262{ 263 acpi_status status; 264 struct acpi_buffer output; 265 union acpi_object *out_obj; 266 ide_hwif_t *hwif = HWIF(drive); 267 struct device *dev = hwif->gendev.parent; 268 int err = -ENODEV; 269 int port; 270 271 *gtf_length = 0; 272 *gtf_address = 0UL; 273 *obj_loc = 0UL; 274 275 if (ide_noacpi) 276 return 0; 277 278 if (!dev) { 279 DEBPRINT("no PCI device for %s\n", hwif->name); 280 goto out; 281 } 282 283 if (!hwif->acpidata) { 284 DEBPRINT("no ACPI data for %s\n", hwif->name); 285 goto out; 286 } 287 288 port = hwif->channel ? drive->dn - 2: drive->dn; 289 290 DEBPRINT("ENTER: %s at %s, port#: %d, hard_port#: %d\n", 291 hwif->name, dev->bus_id, port, hwif->channel); 292 293 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0) { 294 DEBPRINT("%s drive %d:%d not present\n", 295 hwif->name, hwif->channel, port); 296 goto out; 297 } 298 299 /* Get this drive's _ADR info. if not already known. */ 300 if (!drive->acpidata->obj_handle) { 301 drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive); 302 if (!drive->acpidata->obj_handle) { 303 DEBPRINT("No ACPI object found for %s\n", 304 drive->name); 305 goto out; 306 } 307 } 308 309 /* Setting up output buffer */ 310 output.length = ACPI_ALLOCATE_BUFFER; 311 output.pointer = NULL; /* ACPI-CA sets this; save/free it later */ 312 313 /* _GTF has no input parameters */ 314 err = -EIO; 315 status = acpi_evaluate_object(drive->acpidata->obj_handle, "_GTF", 316 NULL, &output); 317 if (ACPI_FAILURE(status)) { 318 printk(KERN_DEBUG 319 "%s: Run _GTF error: status = 0x%x\n", 320 __func__, status); 321 goto out; 322 } 323 324 if (!output.length || !output.pointer) { 325 DEBPRINT("Run _GTF: " 326 "length or ptr is NULL (0x%llx, 0x%p)\n", 327 (unsigned long long)output.length, 328 output.pointer); 329 goto out; 330 } 331 332 out_obj = output.pointer; 333 if (out_obj->type != ACPI_TYPE_BUFFER) { 334 DEBPRINT("Run _GTF: error: " 335 "expected object type of ACPI_TYPE_BUFFER, " 336 "got 0x%x\n", out_obj->type); 337 err = -ENOENT; 338 kfree(output.pointer); 339 goto out; 340 } 341 342 if (!out_obj->buffer.length || !out_obj->buffer.pointer || 343 out_obj->buffer.length % REGS_PER_GTF) { 344 printk(KERN_ERR 345 "%s: unexpected GTF length (%d) or addr (0x%p)\n", 346 __func__, out_obj->buffer.length, 347 out_obj->buffer.pointer); 348 err = -ENOENT; 349 kfree(output.pointer); 350 goto out; 351 } 352 353 *gtf_length = out_obj->buffer.length; 354 *gtf_address = (unsigned long)out_obj->buffer.pointer; 355 *obj_loc = (unsigned long)out_obj; 356 DEBPRINT("returning gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n", 357 *gtf_length, *gtf_address, *obj_loc); 358 err = 0; 359out: 360 return err; 361} 362 363/** 364 * taskfile_load_raw - send taskfile registers to drive 365 * @drive: drive to which output is sent 366 * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7) 367 * 368 * Outputs IDE taskfile to the drive. 369 */ 370static int taskfile_load_raw(ide_drive_t *drive, 371 const struct taskfile_array *gtf) 372{ 373 ide_task_t args; 374 int err = 0; 375 376 DEBPRINT("(0x1f1-1f7): hex: " 377 "%02x %02x %02x %02x %02x %02x %02x\n", 378 gtf->tfa[0], gtf->tfa[1], gtf->tfa[2], 379 gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]); 380 381 memset(&args, 0, sizeof(ide_task_t)); 382 383 /* convert gtf to IDE Taskfile */ 384 memcpy(&args.tf_array[7], >f->tfa, 7); 385 args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; 386 387 if (!ide_acpigtf) { 388 DEBPRINT("_GTF execution disabled\n"); 389 return err; 390 } 391 392 err = ide_no_data_taskfile(drive, &args); 393 if (err) 394 printk(KERN_ERR "%s: ide_no_data_taskfile failed: %u\n", 395 __func__, err); 396 397 return err; 398} 399 400/** 401 * do_drive_set_taskfiles - write the drive taskfile settings from _GTF 402 * @drive: the drive to which the taskfile command should be sent 403 * @gtf_length: total number of bytes of _GTF taskfiles 404 * @gtf_address: location of _GTF taskfile arrays 405 * 406 * Write {gtf_address, length gtf_length} in groups of 407 * REGS_PER_GTF bytes. 408 */ 409static int do_drive_set_taskfiles(ide_drive_t *drive, 410 unsigned int gtf_length, 411 unsigned long gtf_address) 412{ 413 int rc = -ENODEV, err; 414 int gtf_count = gtf_length / REGS_PER_GTF; 415 int ix; 416 struct taskfile_array *gtf; 417 418 if (ide_noacpi) 419 return 0; 420 421 DEBPRINT("ENTER: %s, hard_port#: %d\n", drive->name, drive->dn); 422 423 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0) 424 goto out; 425 426 if (!gtf_count) /* shouldn't be here */ 427 goto out; 428 429 DEBPRINT("total GTF bytes=%u (0x%x), gtf_count=%d, addr=0x%lx\n", 430 gtf_length, gtf_length, gtf_count, gtf_address); 431 432 if (gtf_length % REGS_PER_GTF) { 433 printk(KERN_ERR "%s: unexpected GTF length (%d)\n", 434 __func__, gtf_length); 435 goto out; 436 } 437 438 rc = 0; 439 for (ix = 0; ix < gtf_count; ix++) { 440 gtf = (struct taskfile_array *) 441 (gtf_address + ix * REGS_PER_GTF); 442 443 /* send all TaskFile registers (0x1f1-0x1f7) *in*that*order* */ 444 err = taskfile_load_raw(drive, gtf); 445 if (err) 446 rc = err; 447 } 448 449out: 450 return rc; 451} 452 453/** 454 * ide_acpi_exec_tfs - get then write drive taskfile settings 455 * @drive: the drive for which the taskfile settings should be 456 * written. 457 * 458 * According to the ACPI spec this should be called after _STM 459 * has been evaluated for the interface. Some ACPI vendors interpret 460 * that as a hard requirement and modify the taskfile according 461 * to the Identify Drive information passed down with _STM. 462 * So one should really make sure to call this only after _STM has 463 * been executed. 464 */ 465int ide_acpi_exec_tfs(ide_drive_t *drive) 466{ 467 int ret; 468 unsigned int gtf_length; 469 unsigned long gtf_address; 470 unsigned long obj_loc; 471 472 if (ide_noacpi) 473 return 0; 474 475 DEBPRINT("call get_GTF, drive=%s port=%d\n", drive->name, drive->dn); 476 477 ret = do_drive_get_GTF(drive, >f_length, >f_address, &obj_loc); 478 if (ret < 0) { 479 DEBPRINT("get_GTF error (%d)\n", ret); 480 return ret; 481 } 482 483 DEBPRINT("call set_taskfiles, drive=%s\n", drive->name); 484 485 ret = do_drive_set_taskfiles(drive, gtf_length, gtf_address); 486 kfree((void *)obj_loc); 487 if (ret < 0) { 488 DEBPRINT("set_taskfiles error (%d)\n", ret); 489 } 490 491 DEBPRINT("ret=%d\n", ret); 492 493 return ret; 494} 495 496/** 497 * ide_acpi_get_timing - get the channel (controller) timings 498 * @hwif: target IDE interface (channel) 499 * 500 * This function executes the _GTM ACPI method for the target channel. 501 * 502 */ 503void ide_acpi_get_timing(ide_hwif_t *hwif) 504{ 505 acpi_status status; 506 struct acpi_buffer output; 507 union acpi_object *out_obj; 508 509 if (ide_noacpi) 510 return; 511 512 DEBPRINT("ENTER:\n"); 513 514 if (!hwif->acpidata) { 515 DEBPRINT("no ACPI data for %s\n", hwif->name); 516 return; 517 } 518 519 /* Setting up output buffer for _GTM */ 520 output.length = ACPI_ALLOCATE_BUFFER; 521 output.pointer = NULL; /* ACPI-CA sets this; save/free it later */ 522 523 /* _GTM has no input parameters */ 524 status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_GTM", 525 NULL, &output); 526 527 DEBPRINT("_GTM status: %d, outptr: 0x%p, outlen: 0x%llx\n", 528 status, output.pointer, 529 (unsigned long long)output.length); 530 531 if (ACPI_FAILURE(status)) { 532 DEBPRINT("Run _GTM error: status = 0x%x\n", status); 533 return; 534 } 535 536 if (!output.length || !output.pointer) { 537 DEBPRINT("Run _GTM: length or ptr is NULL (0x%llx, 0x%p)\n", 538 (unsigned long long)output.length, 539 output.pointer); 540 kfree(output.pointer); 541 return; 542 } 543 544 out_obj = output.pointer; 545 if (out_obj->type != ACPI_TYPE_BUFFER) { 546 kfree(output.pointer); 547 DEBPRINT("Run _GTM: error: " 548 "expected object type of ACPI_TYPE_BUFFER, " 549 "got 0x%x\n", out_obj->type); 550 return; 551 } 552 553 if (!out_obj->buffer.length || !out_obj->buffer.pointer || 554 out_obj->buffer.length != sizeof(struct GTM_buffer)) { 555 kfree(output.pointer); 556 printk(KERN_ERR 557 "%s: unexpected _GTM length (0x%x)[should be 0x%zx] or " 558 "addr (0x%p)\n", 559 __func__, out_obj->buffer.length, 560 sizeof(struct GTM_buffer), out_obj->buffer.pointer); 561 return; 562 } 563 564 memcpy(&hwif->acpidata->gtm, out_obj->buffer.pointer, 565 sizeof(struct GTM_buffer)); 566 567 DEBPRINT("_GTM info: ptr: 0x%p, len: 0x%x, exp.len: 0x%Zx\n", 568 out_obj->buffer.pointer, out_obj->buffer.length, 569 sizeof(struct GTM_buffer)); 570 571 DEBPRINT("_GTM fields: 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n", 572 hwif->acpidata->gtm.PIO_speed0, 573 hwif->acpidata->gtm.DMA_speed0, 574 hwif->acpidata->gtm.PIO_speed1, 575 hwif->acpidata->gtm.DMA_speed1, 576 hwif->acpidata->gtm.GTM_flags); 577 578 kfree(output.pointer); 579} 580 581/** 582 * ide_acpi_push_timing - set the channel (controller) timings 583 * @hwif: target IDE interface (channel) 584 * 585 * This function executes the _STM ACPI method for the target channel. 586 * 587 * _STM requires Identify Drive data, which has to passed as an argument. 588 * Unfortunately drive->id is a mangled version which we can't readily 589 * use; hence we'll get the information afresh. 590 */ 591void ide_acpi_push_timing(ide_hwif_t *hwif) 592{ 593 acpi_status status; 594 struct acpi_object_list input; 595 union acpi_object in_params[3]; 596 struct ide_acpi_drive_link *master = &hwif->acpidata->master; 597 struct ide_acpi_drive_link *slave = &hwif->acpidata->slave; 598 599 if (ide_noacpi) 600 return; 601 602 DEBPRINT("ENTER:\n"); 603 604 if (!hwif->acpidata) { 605 DEBPRINT("no ACPI data for %s\n", hwif->name); 606 return; 607 } 608 609 /* Give the GTM buffer + drive Identify data to the channel via the 610 * _STM method: */ 611 /* setup input parameters buffer for _STM */ 612 input.count = 3; 613 input.pointer = in_params; 614 in_params[0].type = ACPI_TYPE_BUFFER; 615 in_params[0].buffer.length = sizeof(struct GTM_buffer); 616 in_params[0].buffer.pointer = (u8 *)&hwif->acpidata->gtm; 617 in_params[1].type = ACPI_TYPE_BUFFER; 618 in_params[1].buffer.length = ATA_ID_WORDS * 2; 619 in_params[1].buffer.pointer = (u8 *)&master->idbuff; 620 in_params[2].type = ACPI_TYPE_BUFFER; 621 in_params[2].buffer.length = ATA_ID_WORDS * 2; 622 in_params[2].buffer.pointer = (u8 *)&slave->idbuff; 623 /* Output buffer: _STM has no output */ 624 625 status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_STM", 626 &input, NULL); 627 628 if (ACPI_FAILURE(status)) { 629 DEBPRINT("Run _STM error: status = 0x%x\n", status); 630 } 631 DEBPRINT("_STM status: %d\n", status); 632} 633 634/** 635 * ide_acpi_set_state - set the channel power state 636 * @hwif: target IDE interface 637 * @on: state, on/off 638 * 639 * This function executes the _PS0/_PS3 ACPI method to set the power state. 640 * ACPI spec requires _PS0 when IDE power on and _PS3 when power off 641 */ 642void ide_acpi_set_state(ide_hwif_t *hwif, int on) 643{ 644 int unit; 645 646 if (ide_noacpi || ide_noacpi_psx) 647 return; 648 649 DEBPRINT("ENTER:\n"); 650 651 if (!hwif->acpidata) { 652 DEBPRINT("no ACPI data for %s\n", hwif->name); 653 return; 654 } 655 /* channel first and then drives for power on and verse versa for power off */ 656 if (on) 657 acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0); 658 for (unit = 0; unit < MAX_DRIVES; ++unit) { 659 ide_drive_t *drive = &hwif->drives[unit]; 660 661 if (!drive->acpidata->obj_handle) 662 drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive); 663 664 if (drive->acpidata->obj_handle && 665 (drive->dev_flags & IDE_DFLAG_PRESENT)) { 666 acpi_bus_set_power(drive->acpidata->obj_handle, 667 on? ACPI_STATE_D0: ACPI_STATE_D3); 668 } 669 } 670 if (!on) 671 acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D3); 672} 673 674/** 675 * ide_acpi_init - initialize the ACPI link for an IDE interface 676 * @hwif: target IDE interface (channel) 677 * 678 * The ACPI spec is not quite clear when the drive identify buffer 679 * should be obtained. Calling IDENTIFY DEVICE during shutdown 680 * is not the best of ideas as the drive might already being put to 681 * sleep. And obviously we can't call it during resume. 682 * So we get the information during startup; but this means that 683 * any changes during run-time will be lost after resume. 684 */ 685void ide_acpi_init(ide_hwif_t *hwif) 686{ 687 ide_acpi_blacklist(); 688 689 hwif->acpidata = kzalloc(sizeof(struct ide_acpi_hwif_link), GFP_KERNEL); 690 if (!hwif->acpidata) 691 return; 692 693 hwif->acpidata->obj_handle = ide_acpi_hwif_get_handle(hwif); 694 if (!hwif->acpidata->obj_handle) { 695 DEBPRINT("no ACPI object for %s found\n", hwif->name); 696 kfree(hwif->acpidata); 697 hwif->acpidata = NULL; 698 } 699} 700 701void ide_acpi_port_init_devices(ide_hwif_t *hwif) 702{ 703 ide_drive_t *drive; 704 int i, err; 705 706 if (hwif->acpidata == NULL) 707 return; 708 709 /* 710 * The ACPI spec mandates that we send information 711 * for both drives, regardless whether they are connected 712 * or not. 713 */ 714 hwif->drives[0].acpidata = &hwif->acpidata->master; 715 hwif->drives[1].acpidata = &hwif->acpidata->slave; 716 717 /* 718 * Send IDENTIFY for each drive 719 */ 720 for (i = 0; i < MAX_DRIVES; i++) { 721 drive = &hwif->drives[i]; 722 723 memset(drive->acpidata, 0, sizeof(*drive->acpidata)); 724 725 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0) 726 continue; 727 728 err = taskfile_lib_get_identify(drive, drive->acpidata->idbuff); 729 if (err) 730 DEBPRINT("identify device %s failed (%d)\n", 731 drive->name, err); 732 } 733 734 if (!ide_acpionboot) { 735 DEBPRINT("ACPI methods disabled on boot\n"); 736 return; 737 } 738 739 /* ACPI _PS0 before _STM */ 740 ide_acpi_set_state(hwif, 1); 741 /* 742 * ACPI requires us to call _STM on startup 743 */ 744 ide_acpi_get_timing(hwif); 745 ide_acpi_push_timing(hwif); 746 747 for (i = 0; i < MAX_DRIVES; i++) { 748 drive = &hwif->drives[i]; 749 750 if (drive->dev_flags & IDE_DFLAG_PRESENT) 751 /* Execute ACPI startup code */ 752 ide_acpi_exec_tfs(drive); 753 } 754} 755