1 /* 2 * libata-acpi.c 3 * Provides ACPI support for PATA/SATA. 4 * 5 * Copyright (C) 2006 Intel Corp. 6 * Copyright (C) 2006 Randy Dunlap 7 */ 8 9 #include <linux/module.h> 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/acpi.h> 16 #include <linux/libata.h> 17 #include <linux/pci.h> 18 #include <scsi/scsi_device.h> 19 #include "libata.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 enum { 30 ATA_ACPI_FILTER_SETXFER = 1 << 0, 31 ATA_ACPI_FILTER_LOCK = 1 << 1, 32 33 ATA_ACPI_FILTER_DEFAULT = ATA_ACPI_FILTER_SETXFER | 34 ATA_ACPI_FILTER_LOCK, 35 }; 36 37 static unsigned int ata_acpi_gtf_filter = ATA_ACPI_FILTER_DEFAULT; 38 module_param_named(acpi_gtf_filter, ata_acpi_gtf_filter, int, 0644); 39 MODULE_PARM_DESC(acpi_gtf_filter, "filter mask for ACPI _GTF commands, set to filter out (0x1=set xfermode, 0x2=lock/freeze lock)"); 40 41 #define NO_PORT_MULT 0xffff 42 #define SATA_ADR(root, pmp) (((root) << 16) | (pmp)) 43 44 #define REGS_PER_GTF 7 45 struct ata_acpi_gtf { 46 u8 tf[REGS_PER_GTF]; /* regs. 0x1f1 - 0x1f7 */ 47 } __packed; 48 49 /* 50 * Helper - belongs in the PCI layer somewhere eventually 51 */ 52 static int is_pci_dev(struct device *dev) 53 { 54 return (dev->bus == &pci_bus_type); 55 } 56 57 static void ata_acpi_clear_gtf(struct ata_device *dev) 58 { 59 kfree(dev->gtf_cache); 60 dev->gtf_cache = NULL; 61 } 62 63 /** 64 * ata_acpi_associate_sata_port - associate SATA port with ACPI objects 65 * @ap: target SATA port 66 * 67 * Look up ACPI objects associated with @ap and initialize acpi_handle 68 * fields of @ap, the port and devices accordingly. 69 * 70 * LOCKING: 71 * EH context. 72 * 73 * RETURNS: 74 * 0 on success, -errno on failure. 75 */ 76 void ata_acpi_associate_sata_port(struct ata_port *ap) 77 { 78 WARN_ON(!(ap->flags & ATA_FLAG_ACPI_SATA)); 79 80 if (!sata_pmp_attached(ap)) { 81 acpi_integer adr = SATA_ADR(ap->port_no, NO_PORT_MULT); 82 83 ap->link.device->acpi_handle = 84 acpi_get_child(ap->host->acpi_handle, adr); 85 } else { 86 struct ata_link *link; 87 88 ap->link.device->acpi_handle = NULL; 89 90 ata_port_for_each_link(link, ap) { 91 acpi_integer adr = SATA_ADR(ap->port_no, link->pmp); 92 93 link->device->acpi_handle = 94 acpi_get_child(ap->host->acpi_handle, adr); 95 } 96 } 97 } 98 99 static void ata_acpi_associate_ide_port(struct ata_port *ap) 100 { 101 int max_devices, i; 102 103 ap->acpi_handle = acpi_get_child(ap->host->acpi_handle, ap->port_no); 104 if (!ap->acpi_handle) 105 return; 106 107 max_devices = 1; 108 if (ap->flags & ATA_FLAG_SLAVE_POSS) 109 max_devices++; 110 111 for (i = 0; i < max_devices; i++) { 112 struct ata_device *dev = &ap->link.device[i]; 113 114 dev->acpi_handle = acpi_get_child(ap->acpi_handle, i); 115 } 116 117 if (ata_acpi_gtm(ap, &ap->__acpi_init_gtm) == 0) 118 ap->pflags |= ATA_PFLAG_INIT_GTM_VALID; 119 } 120 121 static void ata_acpi_handle_hotplug(struct ata_port *ap, struct ata_device *dev, 122 u32 event) 123 { 124 char event_string[12]; 125 char *envp[] = { event_string, NULL }; 126 struct ata_eh_info *ehi; 127 struct kobject *kobj = NULL; 128 int wait = 0; 129 unsigned long flags; 130 131 if (!ap) 132 ap = dev->link->ap; 133 ehi = &ap->link.eh_info; 134 135 spin_lock_irqsave(ap->lock, flags); 136 137 switch (event) { 138 case ACPI_NOTIFY_BUS_CHECK: 139 case ACPI_NOTIFY_DEVICE_CHECK: 140 ata_ehi_push_desc(ehi, "ACPI event"); 141 ata_ehi_hotplugged(ehi); 142 ata_port_freeze(ap); 143 break; 144 145 case ACPI_NOTIFY_EJECT_REQUEST: 146 ata_ehi_push_desc(ehi, "ACPI event"); 147 if (dev) 148 dev->flags |= ATA_DFLAG_DETACH; 149 else { 150 struct ata_link *tlink; 151 struct ata_device *tdev; 152 153 ata_port_for_each_link(tlink, ap) 154 ata_link_for_each_dev(tdev, tlink) 155 tdev->flags |= ATA_DFLAG_DETACH; 156 } 157 158 ata_port_schedule_eh(ap); 159 wait = 1; 160 break; 161 } 162 163 if (dev) { 164 if (dev->sdev) 165 kobj = &dev->sdev->sdev_gendev.kobj; 166 } else 167 kobj = &ap->dev->kobj; 168 169 if (kobj) { 170 sprintf(event_string, "BAY_EVENT=%d", event); 171 kobject_uevent_env(kobj, KOBJ_CHANGE, envp); 172 } 173 174 spin_unlock_irqrestore(ap->lock, flags); 175 176 if (wait) 177 ata_port_wait_eh(ap); 178 } 179 180 static void ata_acpi_dev_notify(acpi_handle handle, u32 event, void *data) 181 { 182 struct ata_device *dev = data; 183 184 ata_acpi_handle_hotplug(NULL, dev, event); 185 } 186 187 static void ata_acpi_ap_notify(acpi_handle handle, u32 event, void *data) 188 { 189 struct ata_port *ap = data; 190 191 ata_acpi_handle_hotplug(ap, NULL, event); 192 } 193 194 /** 195 * ata_acpi_associate - associate ATA host with ACPI objects 196 * @host: target ATA host 197 * 198 * Look up ACPI objects associated with @host and initialize 199 * acpi_handle fields of @host, its ports and devices accordingly. 200 * 201 * LOCKING: 202 * EH context. 203 * 204 * RETURNS: 205 * 0 on success, -errno on failure. 206 */ 207 void ata_acpi_associate(struct ata_host *host) 208 { 209 int i, j; 210 211 if (!is_pci_dev(host->dev) || libata_noacpi) 212 return; 213 214 host->acpi_handle = DEVICE_ACPI_HANDLE(host->dev); 215 if (!host->acpi_handle) 216 return; 217 218 for (i = 0; i < host->n_ports; i++) { 219 struct ata_port *ap = host->ports[i]; 220 221 if (host->ports[0]->flags & ATA_FLAG_ACPI_SATA) 222 ata_acpi_associate_sata_port(ap); 223 else 224 ata_acpi_associate_ide_port(ap); 225 226 if (ap->acpi_handle) { 227 acpi_install_notify_handler(ap->acpi_handle, 228 ACPI_SYSTEM_NOTIFY, 229 ata_acpi_ap_notify, ap); 230 /* we might be on a docking station */ 231 register_hotplug_dock_device(ap->acpi_handle, 232 ata_acpi_ap_notify, ap); 233 } 234 235 for (j = 0; j < ata_link_max_devices(&ap->link); j++) { 236 struct ata_device *dev = &ap->link.device[j]; 237 238 if (dev->acpi_handle) { 239 acpi_install_notify_handler(dev->acpi_handle, 240 ACPI_SYSTEM_NOTIFY, 241 ata_acpi_dev_notify, dev); 242 /* we might be on a docking station */ 243 register_hotplug_dock_device(dev->acpi_handle, 244 ata_acpi_dev_notify, dev); 245 } 246 } 247 } 248 } 249 250 /** 251 * ata_acpi_dissociate - dissociate ATA host from ACPI objects 252 * @host: target ATA host 253 * 254 * This function is called during driver detach after the whole host 255 * is shut down. 256 * 257 * LOCKING: 258 * EH context. 259 */ 260 void ata_acpi_dissociate(struct ata_host *host) 261 { 262 int i; 263 264 /* Restore initial _GTM values so that driver which attaches 265 * afterward can use them too. 266 */ 267 for (i = 0; i < host->n_ports; i++) { 268 struct ata_port *ap = host->ports[i]; 269 const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap); 270 271 if (ap->acpi_handle && gtm) 272 ata_acpi_stm(ap, gtm); 273 } 274 } 275 276 /** 277 * ata_acpi_gtm - execute _GTM 278 * @ap: target ATA port 279 * @gtm: out parameter for _GTM result 280 * 281 * Evaluate _GTM and store the result in @gtm. 282 * 283 * LOCKING: 284 * EH context. 285 * 286 * RETURNS: 287 * 0 on success, -ENOENT if _GTM doesn't exist, -errno on failure. 288 */ 289 int ata_acpi_gtm(struct ata_port *ap, struct ata_acpi_gtm *gtm) 290 { 291 struct acpi_buffer output = { .length = ACPI_ALLOCATE_BUFFER }; 292 union acpi_object *out_obj; 293 acpi_status status; 294 int rc = 0; 295 296 status = acpi_evaluate_object(ap->acpi_handle, "_GTM", NULL, &output); 297 298 rc = -ENOENT; 299 if (status == AE_NOT_FOUND) 300 goto out_free; 301 302 rc = -EINVAL; 303 if (ACPI_FAILURE(status)) { 304 ata_port_printk(ap, KERN_ERR, 305 "ACPI get timing mode failed (AE 0x%x)\n", 306 status); 307 goto out_free; 308 } 309 310 out_obj = output.pointer; 311 if (out_obj->type != ACPI_TYPE_BUFFER) { 312 ata_port_printk(ap, KERN_WARNING, 313 "_GTM returned unexpected object type 0x%x\n", 314 out_obj->type); 315 316 goto out_free; 317 } 318 319 if (out_obj->buffer.length != sizeof(struct ata_acpi_gtm)) { 320 ata_port_printk(ap, KERN_ERR, 321 "_GTM returned invalid length %d\n", 322 out_obj->buffer.length); 323 goto out_free; 324 } 325 326 memcpy(gtm, out_obj->buffer.pointer, sizeof(struct ata_acpi_gtm)); 327 rc = 0; 328 out_free: 329 kfree(output.pointer); 330 return rc; 331 } 332 333 EXPORT_SYMBOL_GPL(ata_acpi_gtm); 334 335 /** 336 * ata_acpi_stm - execute _STM 337 * @ap: target ATA port 338 * @stm: timing parameter to _STM 339 * 340 * Evaluate _STM with timing parameter @stm. 341 * 342 * LOCKING: 343 * EH context. 344 * 345 * RETURNS: 346 * 0 on success, -ENOENT if _STM doesn't exist, -errno on failure. 347 */ 348 int ata_acpi_stm(struct ata_port *ap, const struct ata_acpi_gtm *stm) 349 { 350 acpi_status status; 351 struct ata_acpi_gtm stm_buf = *stm; 352 struct acpi_object_list input; 353 union acpi_object in_params[3]; 354 355 in_params[0].type = ACPI_TYPE_BUFFER; 356 in_params[0].buffer.length = sizeof(struct ata_acpi_gtm); 357 in_params[0].buffer.pointer = (u8 *)&stm_buf; 358 /* Buffers for id may need byteswapping ? */ 359 in_params[1].type = ACPI_TYPE_BUFFER; 360 in_params[1].buffer.length = 512; 361 in_params[1].buffer.pointer = (u8 *)ap->link.device[0].id; 362 in_params[2].type = ACPI_TYPE_BUFFER; 363 in_params[2].buffer.length = 512; 364 in_params[2].buffer.pointer = (u8 *)ap->link.device[1].id; 365 366 input.count = 3; 367 input.pointer = in_params; 368 369 status = acpi_evaluate_object(ap->acpi_handle, "_STM", &input, NULL); 370 371 if (status == AE_NOT_FOUND) 372 return -ENOENT; 373 if (ACPI_FAILURE(status)) { 374 ata_port_printk(ap, KERN_ERR, 375 "ACPI set timing mode failed (status=0x%x)\n", status); 376 return -EINVAL; 377 } 378 return 0; 379 } 380 381 EXPORT_SYMBOL_GPL(ata_acpi_stm); 382 383 /** 384 * ata_dev_get_GTF - get the drive bootup default taskfile settings 385 * @dev: target ATA device 386 * @gtf: output parameter for buffer containing _GTF taskfile arrays 387 * 388 * This applies to both PATA and SATA drives. 389 * 390 * The _GTF method has no input parameters. 391 * It returns a variable number of register set values (registers 392 * hex 1F1..1F7, taskfiles). 393 * The <variable number> is not known in advance, so have ACPI-CA 394 * allocate the buffer as needed and return it, then free it later. 395 * 396 * LOCKING: 397 * EH context. 398 * 399 * RETURNS: 400 * Number of taskfiles on success, 0 if _GTF doesn't exist. -EINVAL 401 * if _GTF is invalid. 402 */ 403 static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf) 404 { 405 struct ata_port *ap = dev->link->ap; 406 acpi_status status; 407 struct acpi_buffer output; 408 union acpi_object *out_obj; 409 int rc = 0; 410 411 /* if _GTF is cached, use the cached value */ 412 if (dev->gtf_cache) { 413 out_obj = dev->gtf_cache; 414 goto done; 415 } 416 417 /* set up output buffer */ 418 output.length = ACPI_ALLOCATE_BUFFER; 419 output.pointer = NULL; /* ACPI-CA sets this; save/free it later */ 420 421 if (ata_msg_probe(ap)) 422 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n", 423 __func__, ap->port_no); 424 425 /* _GTF has no input parameters */ 426 status = acpi_evaluate_object(dev->acpi_handle, "_GTF", NULL, &output); 427 out_obj = dev->gtf_cache = output.pointer; 428 429 if (ACPI_FAILURE(status)) { 430 if (status != AE_NOT_FOUND) { 431 ata_dev_printk(dev, KERN_WARNING, 432 "_GTF evaluation failed (AE 0x%x)\n", 433 status); 434 rc = -EINVAL; 435 } 436 goto out_free; 437 } 438 439 if (!output.length || !output.pointer) { 440 if (ata_msg_probe(ap)) 441 ata_dev_printk(dev, KERN_DEBUG, "%s: Run _GTF: " 442 "length or ptr is NULL (0x%llx, 0x%p)\n", 443 __func__, 444 (unsigned long long)output.length, 445 output.pointer); 446 rc = -EINVAL; 447 goto out_free; 448 } 449 450 if (out_obj->type != ACPI_TYPE_BUFFER) { 451 ata_dev_printk(dev, KERN_WARNING, 452 "_GTF unexpected object type 0x%x\n", 453 out_obj->type); 454 rc = -EINVAL; 455 goto out_free; 456 } 457 458 if (out_obj->buffer.length % REGS_PER_GTF) { 459 ata_dev_printk(dev, KERN_WARNING, 460 "unexpected _GTF length (%d)\n", 461 out_obj->buffer.length); 462 rc = -EINVAL; 463 goto out_free; 464 } 465 466 done: 467 rc = out_obj->buffer.length / REGS_PER_GTF; 468 if (gtf) { 469 *gtf = (void *)out_obj->buffer.pointer; 470 if (ata_msg_probe(ap)) 471 ata_dev_printk(dev, KERN_DEBUG, 472 "%s: returning gtf=%p, gtf_count=%d\n", 473 __func__, *gtf, rc); 474 } 475 return rc; 476 477 out_free: 478 ata_acpi_clear_gtf(dev); 479 return rc; 480 } 481 482 /** 483 * ata_acpi_gtm_xfermode - determine xfermode from GTM parameter 484 * @dev: target device 485 * @gtm: GTM parameter to use 486 * 487 * Determine xfermask for @dev from @gtm. 488 * 489 * LOCKING: 490 * None. 491 * 492 * RETURNS: 493 * Determined xfermask. 494 */ 495 unsigned long ata_acpi_gtm_xfermask(struct ata_device *dev, 496 const struct ata_acpi_gtm *gtm) 497 { 498 unsigned long xfer_mask = 0; 499 unsigned int type; 500 int unit; 501 u8 mode; 502 503 /* we always use the 0 slot for crap hardware */ 504 unit = dev->devno; 505 if (!(gtm->flags & 0x10)) 506 unit = 0; 507 508 /* PIO */ 509 mode = ata_timing_cycle2mode(ATA_SHIFT_PIO, gtm->drive[unit].pio); 510 xfer_mask |= ata_xfer_mode2mask(mode); 511 512 /* See if we have MWDMA or UDMA data. We don't bother with 513 * MWDMA if UDMA is available as this means the BIOS set UDMA 514 * and our error changedown if it works is UDMA to PIO anyway. 515 */ 516 if (!(gtm->flags & (1 << (2 * unit)))) 517 type = ATA_SHIFT_MWDMA; 518 else 519 type = ATA_SHIFT_UDMA; 520 521 mode = ata_timing_cycle2mode(type, gtm->drive[unit].dma); 522 xfer_mask |= ata_xfer_mode2mask(mode); 523 524 return xfer_mask; 525 } 526 EXPORT_SYMBOL_GPL(ata_acpi_gtm_xfermask); 527 528 /** 529 * ata_acpi_cbl_80wire - Check for 80 wire cable 530 * @ap: Port to check 531 * @gtm: GTM data to use 532 * 533 * Return 1 if the @gtm indicates the BIOS selected an 80wire mode. 534 */ 535 int ata_acpi_cbl_80wire(struct ata_port *ap, const struct ata_acpi_gtm *gtm) 536 { 537 struct ata_device *dev; 538 539 ata_link_for_each_dev(dev, &ap->link) { 540 unsigned long xfer_mask, udma_mask; 541 542 if (!ata_dev_enabled(dev)) 543 continue; 544 545 xfer_mask = ata_acpi_gtm_xfermask(dev, gtm); 546 ata_unpack_xfermask(xfer_mask, NULL, NULL, &udma_mask); 547 548 if (udma_mask & ~ATA_UDMA_MASK_40C) 549 return 1; 550 } 551 552 return 0; 553 } 554 EXPORT_SYMBOL_GPL(ata_acpi_cbl_80wire); 555 556 static void ata_acpi_gtf_to_tf(struct ata_device *dev, 557 const struct ata_acpi_gtf *gtf, 558 struct ata_taskfile *tf) 559 { 560 ata_tf_init(dev, tf); 561 562 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 563 tf->protocol = ATA_PROT_NODATA; 564 tf->feature = gtf->tf[0]; /* 0x1f1 */ 565 tf->nsect = gtf->tf[1]; /* 0x1f2 */ 566 tf->lbal = gtf->tf[2]; /* 0x1f3 */ 567 tf->lbam = gtf->tf[3]; /* 0x1f4 */ 568 tf->lbah = gtf->tf[4]; /* 0x1f5 */ 569 tf->device = gtf->tf[5]; /* 0x1f6 */ 570 tf->command = gtf->tf[6]; /* 0x1f7 */ 571 } 572 573 static int ata_acpi_filter_tf(const struct ata_taskfile *tf, 574 const struct ata_taskfile *ptf) 575 { 576 if (ata_acpi_gtf_filter & ATA_ACPI_FILTER_SETXFER) { 577 /* libata doesn't use ACPI to configure transfer mode. 578 * It will only confuse device configuration. Skip. 579 */ 580 if (tf->command == ATA_CMD_SET_FEATURES && 581 tf->feature == SETFEATURES_XFER) 582 return 1; 583 } 584 585 if (ata_acpi_gtf_filter & ATA_ACPI_FILTER_LOCK) { 586 /* BIOS writers, sorry but we don't wanna lock 587 * features unless the user explicitly said so. 588 */ 589 590 /* DEVICE CONFIGURATION FREEZE LOCK */ 591 if (tf->command == ATA_CMD_CONF_OVERLAY && 592 tf->feature == ATA_DCO_FREEZE_LOCK) 593 return 1; 594 595 /* SECURITY FREEZE LOCK */ 596 if (tf->command == ATA_CMD_SEC_FREEZE_LOCK) 597 return 1; 598 599 /* SET MAX LOCK and SET MAX FREEZE LOCK */ 600 if ((!ptf || ptf->command != ATA_CMD_READ_NATIVE_MAX) && 601 tf->command == ATA_CMD_SET_MAX && 602 (tf->feature == ATA_SET_MAX_LOCK || 603 tf->feature == ATA_SET_MAX_FREEZE_LOCK)) 604 return 1; 605 } 606 607 return 0; 608 } 609 610 /** 611 * ata_acpi_run_tf - send taskfile registers to host controller 612 * @dev: target ATA device 613 * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7) 614 * 615 * Outputs ATA taskfile to standard ATA host controller using MMIO 616 * or PIO as indicated by the ATA_FLAG_MMIO flag. 617 * Writes the control, feature, nsect, lbal, lbam, and lbah registers. 618 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect, 619 * hob_lbal, hob_lbam, and hob_lbah. 620 * 621 * This function waits for idle (!BUSY and !DRQ) after writing 622 * registers. If the control register has a new value, this 623 * function also waits for idle after writing control and before 624 * writing the remaining registers. 625 * 626 * LOCKING: 627 * EH context. 628 * 629 * RETURNS: 630 * 1 if command is executed successfully. 0 if ignored, rejected or 631 * filtered out, -errno on other errors. 632 */ 633 static int ata_acpi_run_tf(struct ata_device *dev, 634 const struct ata_acpi_gtf *gtf, 635 const struct ata_acpi_gtf *prev_gtf) 636 { 637 struct ata_taskfile *pptf = NULL; 638 struct ata_taskfile tf, ptf, rtf; 639 unsigned int err_mask; 640 const char *level; 641 char msg[60]; 642 int rc; 643 644 if ((gtf->tf[0] == 0) && (gtf->tf[1] == 0) && (gtf->tf[2] == 0) 645 && (gtf->tf[3] == 0) && (gtf->tf[4] == 0) && (gtf->tf[5] == 0) 646 && (gtf->tf[6] == 0)) 647 return 0; 648 649 ata_acpi_gtf_to_tf(dev, gtf, &tf); 650 if (prev_gtf) { 651 ata_acpi_gtf_to_tf(dev, prev_gtf, &ptf); 652 pptf = &ptf; 653 } 654 655 if (!ata_acpi_filter_tf(&tf, pptf)) { 656 rtf = tf; 657 err_mask = ata_exec_internal(dev, &rtf, NULL, 658 DMA_NONE, NULL, 0, 0); 659 660 switch (err_mask) { 661 case 0: 662 level = KERN_DEBUG; 663 snprintf(msg, sizeof(msg), "succeeded"); 664 rc = 1; 665 break; 666 667 case AC_ERR_DEV: 668 level = KERN_INFO; 669 snprintf(msg, sizeof(msg), 670 "rejected by device (Stat=0x%02x Err=0x%02x)", 671 rtf.command, rtf.feature); 672 rc = 0; 673 break; 674 675 default: 676 level = KERN_ERR; 677 snprintf(msg, sizeof(msg), 678 "failed (Emask=0x%x Stat=0x%02x Err=0x%02x)", 679 err_mask, rtf.command, rtf.feature); 680 rc = -EIO; 681 break; 682 } 683 } else { 684 level = KERN_INFO; 685 snprintf(msg, sizeof(msg), "filtered out"); 686 rc = 0; 687 } 688 689 ata_dev_printk(dev, level, 690 "ACPI cmd %02x/%02x:%02x:%02x:%02x:%02x:%02x %s\n", 691 tf.command, tf.feature, tf.nsect, tf.lbal, 692 tf.lbam, tf.lbah, tf.device, msg); 693 694 return rc; 695 } 696 697 /** 698 * ata_acpi_exec_tfs - get then write drive taskfile settings 699 * @dev: target ATA device 700 * @nr_executed: out paramter for the number of executed commands 701 * 702 * Evaluate _GTF and excute returned taskfiles. 703 * 704 * LOCKING: 705 * EH context. 706 * 707 * RETURNS: 708 * Number of executed taskfiles on success, 0 if _GTF doesn't exist. 709 * -errno on other errors. 710 */ 711 static int ata_acpi_exec_tfs(struct ata_device *dev, int *nr_executed) 712 { 713 struct ata_acpi_gtf *gtf = NULL, *pgtf = NULL; 714 int gtf_count, i, rc; 715 716 /* get taskfiles */ 717 rc = ata_dev_get_GTF(dev, >f); 718 if (rc < 0) 719 return rc; 720 gtf_count = rc; 721 722 /* execute them */ 723 for (i = 0; i < gtf_count; i++, gtf++) { 724 rc = ata_acpi_run_tf(dev, gtf, pgtf); 725 if (rc < 0) 726 break; 727 if (rc) { 728 (*nr_executed)++; 729 pgtf = gtf; 730 } 731 } 732 733 ata_acpi_clear_gtf(dev); 734 735 if (rc < 0) 736 return rc; 737 return 0; 738 } 739 740 /** 741 * ata_acpi_push_id - send Identify data to drive 742 * @dev: target ATA device 743 * 744 * _SDD ACPI object: for SATA mode only 745 * Must be after Identify (Packet) Device -- uses its data 746 * ATM this function never returns a failure. It is an optional 747 * method and if it fails for whatever reason, we should still 748 * just keep going. 749 * 750 * LOCKING: 751 * EH context. 752 * 753 * RETURNS: 754 * 0 on success, -errno on failure. 755 */ 756 static int ata_acpi_push_id(struct ata_device *dev) 757 { 758 struct ata_port *ap = dev->link->ap; 759 int err; 760 acpi_status status; 761 struct acpi_object_list input; 762 union acpi_object in_params[1]; 763 764 if (ata_msg_probe(ap)) 765 ata_dev_printk(dev, KERN_DEBUG, "%s: ix = %d, port#: %d\n", 766 __func__, dev->devno, ap->port_no); 767 768 /* Give the drive Identify data to the drive via the _SDD method */ 769 /* _SDD: set up input parameters */ 770 input.count = 1; 771 input.pointer = in_params; 772 in_params[0].type = ACPI_TYPE_BUFFER; 773 in_params[0].buffer.length = sizeof(dev->id[0]) * ATA_ID_WORDS; 774 in_params[0].buffer.pointer = (u8 *)dev->id; 775 /* Output buffer: _SDD has no output */ 776 777 /* It's OK for _SDD to be missing too. */ 778 swap_buf_le16(dev->id, ATA_ID_WORDS); 779 status = acpi_evaluate_object(dev->acpi_handle, "_SDD", &input, NULL); 780 swap_buf_le16(dev->id, ATA_ID_WORDS); 781 782 err = ACPI_FAILURE(status) ? -EIO : 0; 783 if (err < 0) 784 ata_dev_printk(dev, KERN_WARNING, 785 "ACPI _SDD failed (AE 0x%x)\n", status); 786 787 return err; 788 } 789 790 /** 791 * ata_acpi_on_suspend - ATA ACPI hook called on suspend 792 * @ap: target ATA port 793 * 794 * This function is called when @ap is about to be suspended. All 795 * devices are already put to sleep but the port_suspend() callback 796 * hasn't been executed yet. Error return from this function aborts 797 * suspend. 798 * 799 * LOCKING: 800 * EH context. 801 * 802 * RETURNS: 803 * 0 on success, -errno on failure. 804 */ 805 int ata_acpi_on_suspend(struct ata_port *ap) 806 { 807 /* nada */ 808 return 0; 809 } 810 811 /** 812 * ata_acpi_on_resume - ATA ACPI hook called on resume 813 * @ap: target ATA port 814 * 815 * This function is called when @ap is resumed - right after port 816 * itself is resumed but before any EH action is taken. 817 * 818 * LOCKING: 819 * EH context. 820 */ 821 void ata_acpi_on_resume(struct ata_port *ap) 822 { 823 const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap); 824 struct ata_device *dev; 825 826 if (ap->acpi_handle && gtm) { 827 /* _GTM valid */ 828 829 /* restore timing parameters */ 830 ata_acpi_stm(ap, gtm); 831 832 /* _GTF should immediately follow _STM so that it can 833 * use values set by _STM. Cache _GTF result and 834 * schedule _GTF. 835 */ 836 ata_link_for_each_dev(dev, &ap->link) { 837 ata_acpi_clear_gtf(dev); 838 if (ata_dev_enabled(dev) && 839 ata_dev_get_GTF(dev, NULL) >= 0) 840 dev->flags |= ATA_DFLAG_ACPI_PENDING; 841 } 842 } else { 843 /* SATA _GTF needs to be evaulated after _SDD and 844 * there's no reason to evaluate IDE _GTF early 845 * without _STM. Clear cache and schedule _GTF. 846 */ 847 ata_link_for_each_dev(dev, &ap->link) { 848 ata_acpi_clear_gtf(dev); 849 if (ata_dev_enabled(dev)) 850 dev->flags |= ATA_DFLAG_ACPI_PENDING; 851 } 852 } 853 } 854 855 /** 856 * ata_acpi_set_state - set the port power state 857 * @ap: target ATA port 858 * @state: state, on/off 859 * 860 * This function executes the _PS0/_PS3 ACPI method to set the power state. 861 * ACPI spec requires _PS0 when IDE power on and _PS3 when power off 862 */ 863 void ata_acpi_set_state(struct ata_port *ap, pm_message_t state) 864 { 865 struct ata_device *dev; 866 867 if (!ap->acpi_handle || (ap->flags & ATA_FLAG_ACPI_SATA)) 868 return; 869 870 /* channel first and then drives for power on and vica versa 871 for power off */ 872 if (state.event == PM_EVENT_ON) 873 acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D0); 874 875 ata_link_for_each_dev(dev, &ap->link) { 876 if (dev->acpi_handle && ata_dev_enabled(dev)) 877 acpi_bus_set_power(dev->acpi_handle, 878 state.event == PM_EVENT_ON ? 879 ACPI_STATE_D0 : ACPI_STATE_D3); 880 } 881 if (state.event != PM_EVENT_ON) 882 acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D3); 883 } 884 885 /** 886 * ata_acpi_on_devcfg - ATA ACPI hook called on device donfiguration 887 * @dev: target ATA device 888 * 889 * This function is called when @dev is about to be configured. 890 * IDENTIFY data might have been modified after this hook is run. 891 * 892 * LOCKING: 893 * EH context. 894 * 895 * RETURNS: 896 * Positive number if IDENTIFY data needs to be refreshed, 0 if not, 897 * -errno on failure. 898 */ 899 int ata_acpi_on_devcfg(struct ata_device *dev) 900 { 901 struct ata_port *ap = dev->link->ap; 902 struct ata_eh_context *ehc = &ap->link.eh_context; 903 int acpi_sata = ap->flags & ATA_FLAG_ACPI_SATA; 904 int nr_executed = 0; 905 int rc; 906 907 if (!dev->acpi_handle) 908 return 0; 909 910 /* do we need to do _GTF? */ 911 if (!(dev->flags & ATA_DFLAG_ACPI_PENDING) && 912 !(acpi_sata && (ehc->i.flags & ATA_EHI_DID_HARDRESET))) 913 return 0; 914 915 /* do _SDD if SATA */ 916 if (acpi_sata) { 917 rc = ata_acpi_push_id(dev); 918 if (rc) 919 goto acpi_err; 920 } 921 922 /* do _GTF */ 923 rc = ata_acpi_exec_tfs(dev, &nr_executed); 924 if (rc) 925 goto acpi_err; 926 927 dev->flags &= ~ATA_DFLAG_ACPI_PENDING; 928 929 /* refresh IDENTIFY page if any _GTF command has been executed */ 930 if (nr_executed) { 931 rc = ata_dev_reread_id(dev, 0); 932 if (rc < 0) { 933 ata_dev_printk(dev, KERN_ERR, "failed to IDENTIFY " 934 "after ACPI commands\n"); 935 return rc; 936 } 937 } 938 939 return 0; 940 941 acpi_err: 942 /* ignore evaluation failure if we can continue safely */ 943 if (rc == -EINVAL && !nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN)) 944 return 0; 945 946 /* fail and let EH retry once more for unknown IO errors */ 947 if (!(dev->flags & ATA_DFLAG_ACPI_FAILED)) { 948 dev->flags |= ATA_DFLAG_ACPI_FAILED; 949 return rc; 950 } 951 952 ata_dev_printk(dev, KERN_WARNING, 953 "ACPI: failed the second time, disabled\n"); 954 dev->acpi_handle = NULL; 955 956 /* We can safely continue if no _GTF command has been executed 957 * and port is not frozen. 958 */ 959 if (!nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN)) 960 return 0; 961 962 return rc; 963 } 964 965 /** 966 * ata_acpi_on_disable - ATA ACPI hook called when a device is disabled 967 * @dev: target ATA device 968 * 969 * This function is called when @dev is about to be disabled. 970 * 971 * LOCKING: 972 * EH context. 973 */ 974 void ata_acpi_on_disable(struct ata_device *dev) 975 { 976 ata_acpi_clear_gtf(dev); 977 } 978