3 * Provides ACPI support for PATA/SATA.
5 * Copyright (C) 2006 Intel Corp.
6 * Copyright (C) 2006 Randy Dunlap
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>
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>
30 ATA_ACPI_FILTER_SETXFER = 1 << 0,
31 ATA_ACPI_FILTER_LOCK = 1 << 1,
33 ATA_ACPI_FILTER_DEFAULT = ATA_ACPI_FILTER_SETXFER |
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)");
41 #define NO_PORT_MULT 0xffff
42 #define SATA_ADR(root, pmp) (((root) << 16) | (pmp))
44 #define REGS_PER_GTF 7
46 u8 tf[REGS_PER_GTF]; /* regs. 0x1f1 - 0x1f7 */
50 * Helper - belongs in the PCI layer somewhere eventually
52 static int is_pci_dev(struct device *dev)
54 return (dev->bus == &pci_bus_type);
57 static void ata_acpi_clear_gtf(struct ata_device *dev)
59 kfree(dev->gtf_cache);
60 dev->gtf_cache = NULL;
64 * ata_acpi_associate_sata_port - associate SATA port with ACPI objects
65 * @ap: target SATA port
67 * Look up ACPI objects associated with @ap and initialize acpi_handle
68 * fields of @ap, the port and devices accordingly.
74 * 0 on success, -errno on failure.
76 void ata_acpi_associate_sata_port(struct ata_port *ap)
78 WARN_ON(!(ap->flags & ATA_FLAG_ACPI_SATA));
80 if (!sata_pmp_attached(ap)) {
81 acpi_integer adr = SATA_ADR(ap->port_no, NO_PORT_MULT);
83 ap->link.device->acpi_handle =
84 acpi_get_child(ap->host->acpi_handle, adr);
86 struct ata_link *link;
88 ap->link.device->acpi_handle = NULL;
90 ata_port_for_each_link(link, ap) {
91 acpi_integer adr = SATA_ADR(ap->port_no, link->pmp);
93 link->device->acpi_handle =
94 acpi_get_child(ap->host->acpi_handle, adr);
99 static void ata_acpi_associate_ide_port(struct ata_port *ap)
103 ap->acpi_handle = acpi_get_child(ap->host->acpi_handle, ap->port_no);
104 if (!ap->acpi_handle)
108 if (ap->flags & ATA_FLAG_SLAVE_POSS)
111 for (i = 0; i < max_devices; i++) {
112 struct ata_device *dev = &ap->link.device[i];
114 dev->acpi_handle = acpi_get_child(ap->acpi_handle, i);
117 if (ata_acpi_gtm(ap, &ap->__acpi_init_gtm) == 0)
118 ap->pflags |= ATA_PFLAG_INIT_GTM_VALID;
121 static void ata_acpi_handle_hotplug(struct ata_port *ap, struct ata_device *dev,
124 char event_string[12];
125 char *envp[] = { event_string, NULL };
126 struct ata_eh_info *ehi;
127 struct kobject *kobj = NULL;
133 ehi = &ap->link.eh_info;
135 spin_lock_irqsave(ap->lock, flags);
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);
145 case ACPI_NOTIFY_EJECT_REQUEST:
146 ata_ehi_push_desc(ehi, "ACPI event");
148 dev->flags |= ATA_DFLAG_DETACH;
150 struct ata_link *tlink;
151 struct ata_device *tdev;
153 ata_port_for_each_link(tlink, ap)
154 ata_link_for_each_dev(tdev, tlink)
155 tdev->flags |= ATA_DFLAG_DETACH;
158 ata_port_schedule_eh(ap);
165 kobj = &dev->sdev->sdev_gendev.kobj;
167 kobj = &ap->dev->kobj;
170 sprintf(event_string, "BAY_EVENT=%d", event);
171 kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
174 spin_unlock_irqrestore(ap->lock, flags);
177 ata_port_wait_eh(ap);
180 static void ata_acpi_dev_notify(acpi_handle handle, u32 event, void *data)
182 struct ata_device *dev = data;
184 ata_acpi_handle_hotplug(NULL, dev, event);
187 static void ata_acpi_ap_notify(acpi_handle handle, u32 event, void *data)
189 struct ata_port *ap = data;
191 ata_acpi_handle_hotplug(ap, NULL, event);
195 * ata_acpi_associate - associate ATA host with ACPI objects
196 * @host: target ATA host
198 * Look up ACPI objects associated with @host and initialize
199 * acpi_handle fields of @host, its ports and devices accordingly.
205 * 0 on success, -errno on failure.
207 void ata_acpi_associate(struct ata_host *host)
211 if (!is_pci_dev(host->dev) || libata_noacpi)
214 host->acpi_handle = DEVICE_ACPI_HANDLE(host->dev);
215 if (!host->acpi_handle)
218 for (i = 0; i < host->n_ports; i++) {
219 struct ata_port *ap = host->ports[i];
221 if (host->ports[0]->flags & ATA_FLAG_ACPI_SATA)
222 ata_acpi_associate_sata_port(ap);
224 ata_acpi_associate_ide_port(ap);
226 if (ap->acpi_handle) {
227 acpi_install_notify_handler(ap->acpi_handle,
229 ata_acpi_ap_notify, ap);
230 #if defined(CONFIG_ACPI_DOCK) || defined(CONFIG_ACPI_DOCK_MODULE)
231 /* we might be on a docking station */
232 register_hotplug_dock_device(ap->acpi_handle,
233 ata_acpi_ap_notify, ap);
237 for (j = 0; j < ata_link_max_devices(&ap->link); j++) {
238 struct ata_device *dev = &ap->link.device[j];
240 if (dev->acpi_handle) {
241 acpi_install_notify_handler(dev->acpi_handle,
243 ata_acpi_dev_notify, dev);
244 #if defined(CONFIG_ACPI_DOCK) || defined(CONFIG_ACPI_DOCK_MODULE)
245 /* we might be on a docking station */
246 register_hotplug_dock_device(dev->acpi_handle,
247 ata_acpi_dev_notify, dev);
255 * ata_acpi_dissociate - dissociate ATA host from ACPI objects
256 * @host: target ATA host
258 * This function is called during driver detach after the whole host
264 void ata_acpi_dissociate(struct ata_host *host)
268 /* Restore initial _GTM values so that driver which attaches
269 * afterward can use them too.
271 for (i = 0; i < host->n_ports; i++) {
272 struct ata_port *ap = host->ports[i];
273 const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
275 if (ap->acpi_handle && gtm)
276 ata_acpi_stm(ap, gtm);
281 * ata_acpi_gtm - execute _GTM
282 * @ap: target ATA port
283 * @gtm: out parameter for _GTM result
285 * Evaluate _GTM and store the result in @gtm.
291 * 0 on success, -ENOENT if _GTM doesn't exist, -errno on failure.
293 int ata_acpi_gtm(struct ata_port *ap, struct ata_acpi_gtm *gtm)
295 struct acpi_buffer output = { .length = ACPI_ALLOCATE_BUFFER };
296 union acpi_object *out_obj;
300 status = acpi_evaluate_object(ap->acpi_handle, "_GTM", NULL, &output);
303 if (status == AE_NOT_FOUND)
307 if (ACPI_FAILURE(status)) {
308 ata_port_printk(ap, KERN_ERR,
309 "ACPI get timing mode failed (AE 0x%x)\n",
314 out_obj = output.pointer;
315 if (out_obj->type != ACPI_TYPE_BUFFER) {
316 ata_port_printk(ap, KERN_WARNING,
317 "_GTM returned unexpected object type 0x%x\n",
323 if (out_obj->buffer.length != sizeof(struct ata_acpi_gtm)) {
324 ata_port_printk(ap, KERN_ERR,
325 "_GTM returned invalid length %d\n",
326 out_obj->buffer.length);
330 memcpy(gtm, out_obj->buffer.pointer, sizeof(struct ata_acpi_gtm));
333 kfree(output.pointer);
337 EXPORT_SYMBOL_GPL(ata_acpi_gtm);
340 * ata_acpi_stm - execute _STM
341 * @ap: target ATA port
342 * @stm: timing parameter to _STM
344 * Evaluate _STM with timing parameter @stm.
350 * 0 on success, -ENOENT if _STM doesn't exist, -errno on failure.
352 int ata_acpi_stm(struct ata_port *ap, const struct ata_acpi_gtm *stm)
355 struct ata_acpi_gtm stm_buf = *stm;
356 struct acpi_object_list input;
357 union acpi_object in_params[3];
359 in_params[0].type = ACPI_TYPE_BUFFER;
360 in_params[0].buffer.length = sizeof(struct ata_acpi_gtm);
361 in_params[0].buffer.pointer = (u8 *)&stm_buf;
362 /* Buffers for id may need byteswapping ? */
363 in_params[1].type = ACPI_TYPE_BUFFER;
364 in_params[1].buffer.length = 512;
365 in_params[1].buffer.pointer = (u8 *)ap->link.device[0].id;
366 in_params[2].type = ACPI_TYPE_BUFFER;
367 in_params[2].buffer.length = 512;
368 in_params[2].buffer.pointer = (u8 *)ap->link.device[1].id;
371 input.pointer = in_params;
373 status = acpi_evaluate_object(ap->acpi_handle, "_STM", &input, NULL);
375 if (status == AE_NOT_FOUND)
377 if (ACPI_FAILURE(status)) {
378 ata_port_printk(ap, KERN_ERR,
379 "ACPI set timing mode failed (status=0x%x)\n", status);
385 EXPORT_SYMBOL_GPL(ata_acpi_stm);
388 * ata_dev_get_GTF - get the drive bootup default taskfile settings
389 * @dev: target ATA device
390 * @gtf: output parameter for buffer containing _GTF taskfile arrays
392 * This applies to both PATA and SATA drives.
394 * The _GTF method has no input parameters.
395 * It returns a variable number of register set values (registers
396 * hex 1F1..1F7, taskfiles).
397 * The <variable number> is not known in advance, so have ACPI-CA
398 * allocate the buffer as needed and return it, then free it later.
404 * Number of taskfiles on success, 0 if _GTF doesn't exist. -EINVAL
405 * if _GTF is invalid.
407 static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf)
409 struct ata_port *ap = dev->link->ap;
411 struct acpi_buffer output;
412 union acpi_object *out_obj;
415 /* if _GTF is cached, use the cached value */
416 if (dev->gtf_cache) {
417 out_obj = dev->gtf_cache;
421 /* set up output buffer */
422 output.length = ACPI_ALLOCATE_BUFFER;
423 output.pointer = NULL; /* ACPI-CA sets this; save/free it later */
425 if (ata_msg_probe(ap))
426 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
427 __func__, ap->port_no);
429 /* _GTF has no input parameters */
430 status = acpi_evaluate_object(dev->acpi_handle, "_GTF", NULL, &output);
431 out_obj = dev->gtf_cache = output.pointer;
433 if (ACPI_FAILURE(status)) {
434 if (status != AE_NOT_FOUND) {
435 ata_dev_printk(dev, KERN_WARNING,
436 "_GTF evaluation failed (AE 0x%x)\n",
443 if (!output.length || !output.pointer) {
444 if (ata_msg_probe(ap))
445 ata_dev_printk(dev, KERN_DEBUG, "%s: Run _GTF: "
446 "length or ptr is NULL (0x%llx, 0x%p)\n",
448 (unsigned long long)output.length,
454 if (out_obj->type != ACPI_TYPE_BUFFER) {
455 ata_dev_printk(dev, KERN_WARNING,
456 "_GTF unexpected object type 0x%x\n",
462 if (out_obj->buffer.length % REGS_PER_GTF) {
463 ata_dev_printk(dev, KERN_WARNING,
464 "unexpected _GTF length (%d)\n",
465 out_obj->buffer.length);
471 rc = out_obj->buffer.length / REGS_PER_GTF;
473 *gtf = (void *)out_obj->buffer.pointer;
474 if (ata_msg_probe(ap))
475 ata_dev_printk(dev, KERN_DEBUG,
476 "%s: returning gtf=%p, gtf_count=%d\n",
482 ata_acpi_clear_gtf(dev);
487 * ata_acpi_gtm_xfermode - determine xfermode from GTM parameter
488 * @dev: target device
489 * @gtm: GTM parameter to use
491 * Determine xfermask for @dev from @gtm.
497 * Determined xfermask.
499 unsigned long ata_acpi_gtm_xfermask(struct ata_device *dev,
500 const struct ata_acpi_gtm *gtm)
502 unsigned long xfer_mask = 0;
507 /* we always use the 0 slot for crap hardware */
509 if (!(gtm->flags & 0x10))
513 mode = ata_timing_cycle2mode(ATA_SHIFT_PIO, gtm->drive[unit].pio);
514 xfer_mask |= ata_xfer_mode2mask(mode);
516 /* See if we have MWDMA or UDMA data. We don't bother with
517 * MWDMA if UDMA is available as this means the BIOS set UDMA
518 * and our error changedown if it works is UDMA to PIO anyway.
520 if (!(gtm->flags & (1 << (2 * unit))))
521 type = ATA_SHIFT_MWDMA;
523 type = ATA_SHIFT_UDMA;
525 mode = ata_timing_cycle2mode(type, gtm->drive[unit].dma);
526 xfer_mask |= ata_xfer_mode2mask(mode);
530 EXPORT_SYMBOL_GPL(ata_acpi_gtm_xfermask);
533 * ata_acpi_cbl_80wire - Check for 80 wire cable
535 * @gtm: GTM data to use
537 * Return 1 if the @gtm indicates the BIOS selected an 80wire mode.
539 int ata_acpi_cbl_80wire(struct ata_port *ap, const struct ata_acpi_gtm *gtm)
541 struct ata_device *dev;
543 ata_link_for_each_dev(dev, &ap->link) {
544 unsigned long xfer_mask, udma_mask;
546 if (!ata_dev_enabled(dev))
549 xfer_mask = ata_acpi_gtm_xfermask(dev, gtm);
550 ata_unpack_xfermask(xfer_mask, NULL, NULL, &udma_mask);
552 if (udma_mask & ~ATA_UDMA_MASK_40C)
558 EXPORT_SYMBOL_GPL(ata_acpi_cbl_80wire);
560 static void ata_acpi_gtf_to_tf(struct ata_device *dev,
561 const struct ata_acpi_gtf *gtf,
562 struct ata_taskfile *tf)
564 ata_tf_init(dev, tf);
566 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
567 tf->protocol = ATA_PROT_NODATA;
568 tf->feature = gtf->tf[0]; /* 0x1f1 */
569 tf->nsect = gtf->tf[1]; /* 0x1f2 */
570 tf->lbal = gtf->tf[2]; /* 0x1f3 */
571 tf->lbam = gtf->tf[3]; /* 0x1f4 */
572 tf->lbah = gtf->tf[4]; /* 0x1f5 */
573 tf->device = gtf->tf[5]; /* 0x1f6 */
574 tf->command = gtf->tf[6]; /* 0x1f7 */
577 static int ata_acpi_filter_tf(const struct ata_taskfile *tf,
578 const struct ata_taskfile *ptf)
580 if (ata_acpi_gtf_filter & ATA_ACPI_FILTER_SETXFER) {
581 /* libata doesn't use ACPI to configure transfer mode.
582 * It will only confuse device configuration. Skip.
584 if (tf->command == ATA_CMD_SET_FEATURES &&
585 tf->feature == SETFEATURES_XFER)
589 if (ata_acpi_gtf_filter & ATA_ACPI_FILTER_LOCK) {
590 /* BIOS writers, sorry but we don't wanna lock
591 * features unless the user explicitly said so.
594 /* DEVICE CONFIGURATION FREEZE LOCK */
595 if (tf->command == ATA_CMD_CONF_OVERLAY &&
596 tf->feature == ATA_DCO_FREEZE_LOCK)
599 /* SECURITY FREEZE LOCK */
600 if (tf->command == ATA_CMD_SEC_FREEZE_LOCK)
603 /* SET MAX LOCK and SET MAX FREEZE LOCK */
604 if ((!ptf || ptf->command != ATA_CMD_READ_NATIVE_MAX) &&
605 tf->command == ATA_CMD_SET_MAX &&
606 (tf->feature == ATA_SET_MAX_LOCK ||
607 tf->feature == ATA_SET_MAX_FREEZE_LOCK))
615 * ata_acpi_run_tf - send taskfile registers to host controller
616 * @dev: target ATA device
617 * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
619 * Outputs ATA taskfile to standard ATA host controller using MMIO
620 * or PIO as indicated by the ATA_FLAG_MMIO flag.
621 * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
622 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
623 * hob_lbal, hob_lbam, and hob_lbah.
625 * This function waits for idle (!BUSY and !DRQ) after writing
626 * registers. If the control register has a new value, this
627 * function also waits for idle after writing control and before
628 * writing the remaining registers.
634 * 1 if command is executed successfully. 0 if ignored, rejected or
635 * filtered out, -errno on other errors.
637 static int ata_acpi_run_tf(struct ata_device *dev,
638 const struct ata_acpi_gtf *gtf,
639 const struct ata_acpi_gtf *prev_gtf)
641 struct ata_taskfile *pptf = NULL;
642 struct ata_taskfile tf, ptf, rtf;
643 unsigned int err_mask;
648 if ((gtf->tf[0] == 0) && (gtf->tf[1] == 0) && (gtf->tf[2] == 0)
649 && (gtf->tf[3] == 0) && (gtf->tf[4] == 0) && (gtf->tf[5] == 0)
650 && (gtf->tf[6] == 0))
653 ata_acpi_gtf_to_tf(dev, gtf, &tf);
655 ata_acpi_gtf_to_tf(dev, prev_gtf, &ptf);
659 if (!ata_acpi_filter_tf(&tf, pptf)) {
661 err_mask = ata_exec_internal(dev, &rtf, NULL,
662 DMA_NONE, NULL, 0, 0);
667 snprintf(msg, sizeof(msg), "succeeded");
673 snprintf(msg, sizeof(msg),
674 "rejected by device (Stat=0x%02x Err=0x%02x)",
675 rtf.command, rtf.feature);
681 snprintf(msg, sizeof(msg),
682 "failed (Emask=0x%x Stat=0x%02x Err=0x%02x)",
683 err_mask, rtf.command, rtf.feature);
689 snprintf(msg, sizeof(msg), "filtered out");
693 ata_dev_printk(dev, level,
694 "ACPI cmd %02x/%02x:%02x:%02x:%02x:%02x:%02x %s\n",
695 tf.command, tf.feature, tf.nsect, tf.lbal,
696 tf.lbam, tf.lbah, tf.device, msg);
702 * ata_acpi_exec_tfs - get then write drive taskfile settings
703 * @dev: target ATA device
704 * @nr_executed: out paramter for the number of executed commands
706 * Evaluate _GTF and excute returned taskfiles.
712 * Number of executed taskfiles on success, 0 if _GTF doesn't exist.
713 * -errno on other errors.
715 static int ata_acpi_exec_tfs(struct ata_device *dev, int *nr_executed)
717 struct ata_acpi_gtf *gtf = NULL, *pgtf = NULL;
718 int gtf_count, i, rc;
721 rc = ata_dev_get_GTF(dev, >f);
727 for (i = 0; i < gtf_count; i++, gtf++) {
728 rc = ata_acpi_run_tf(dev, gtf, pgtf);
737 ata_acpi_clear_gtf(dev);
745 * ata_acpi_push_id - send Identify data to drive
746 * @dev: target ATA device
748 * _SDD ACPI object: for SATA mode only
749 * Must be after Identify (Packet) Device -- uses its data
750 * ATM this function never returns a failure. It is an optional
751 * method and if it fails for whatever reason, we should still
758 * 0 on success, -errno on failure.
760 static int ata_acpi_push_id(struct ata_device *dev)
762 struct ata_port *ap = dev->link->ap;
765 struct acpi_object_list input;
766 union acpi_object in_params[1];
768 if (ata_msg_probe(ap))
769 ata_dev_printk(dev, KERN_DEBUG, "%s: ix = %d, port#: %d\n",
770 __func__, dev->devno, ap->port_no);
772 /* Give the drive Identify data to the drive via the _SDD method */
773 /* _SDD: set up input parameters */
775 input.pointer = in_params;
776 in_params[0].type = ACPI_TYPE_BUFFER;
777 in_params[0].buffer.length = sizeof(dev->id[0]) * ATA_ID_WORDS;
778 in_params[0].buffer.pointer = (u8 *)dev->id;
779 /* Output buffer: _SDD has no output */
781 /* It's OK for _SDD to be missing too. */
782 swap_buf_le16(dev->id, ATA_ID_WORDS);
783 status = acpi_evaluate_object(dev->acpi_handle, "_SDD", &input, NULL);
784 swap_buf_le16(dev->id, ATA_ID_WORDS);
786 err = ACPI_FAILURE(status) ? -EIO : 0;
788 ata_dev_printk(dev, KERN_WARNING,
789 "ACPI _SDD failed (AE 0x%x)\n", status);
795 * ata_acpi_on_suspend - ATA ACPI hook called on suspend
796 * @ap: target ATA port
798 * This function is called when @ap is about to be suspended. All
799 * devices are already put to sleep but the port_suspend() callback
800 * hasn't been executed yet. Error return from this function aborts
807 * 0 on success, -errno on failure.
809 int ata_acpi_on_suspend(struct ata_port *ap)
816 * ata_acpi_on_resume - ATA ACPI hook called on resume
817 * @ap: target ATA port
819 * This function is called when @ap is resumed - right after port
820 * itself is resumed but before any EH action is taken.
825 void ata_acpi_on_resume(struct ata_port *ap)
827 const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
828 struct ata_device *dev;
830 if (ap->acpi_handle && gtm) {
833 /* restore timing parameters */
834 ata_acpi_stm(ap, gtm);
836 /* _GTF should immediately follow _STM so that it can
837 * use values set by _STM. Cache _GTF result and
840 ata_link_for_each_dev(dev, &ap->link) {
841 ata_acpi_clear_gtf(dev);
842 if (ata_dev_enabled(dev) &&
843 ata_dev_get_GTF(dev, NULL) >= 0)
844 dev->flags |= ATA_DFLAG_ACPI_PENDING;
847 /* SATA _GTF needs to be evaulated after _SDD and
848 * there's no reason to evaluate IDE _GTF early
849 * without _STM. Clear cache and schedule _GTF.
851 ata_link_for_each_dev(dev, &ap->link) {
852 ata_acpi_clear_gtf(dev);
853 if (ata_dev_enabled(dev))
854 dev->flags |= ATA_DFLAG_ACPI_PENDING;
860 * ata_acpi_set_state - set the port power state
861 * @ap: target ATA port
862 * @state: state, on/off
864 * This function executes the _PS0/_PS3 ACPI method to set the power state.
865 * ACPI spec requires _PS0 when IDE power on and _PS3 when power off
867 void ata_acpi_set_state(struct ata_port *ap, pm_message_t state)
869 struct ata_device *dev;
871 if (!ap->acpi_handle || (ap->flags & ATA_FLAG_ACPI_SATA))
874 /* channel first and then drives for power on and vica versa
876 if (state.event == PM_EVENT_ON)
877 acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D0);
879 ata_link_for_each_dev(dev, &ap->link) {
880 if (dev->acpi_handle && ata_dev_enabled(dev))
881 acpi_bus_set_power(dev->acpi_handle,
882 state.event == PM_EVENT_ON ?
883 ACPI_STATE_D0 : ACPI_STATE_D3);
885 if (state.event != PM_EVENT_ON)
886 acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D3);
890 * ata_acpi_on_devcfg - ATA ACPI hook called on device donfiguration
891 * @dev: target ATA device
893 * This function is called when @dev is about to be configured.
894 * IDENTIFY data might have been modified after this hook is run.
900 * Positive number if IDENTIFY data needs to be refreshed, 0 if not,
903 int ata_acpi_on_devcfg(struct ata_device *dev)
905 struct ata_port *ap = dev->link->ap;
906 struct ata_eh_context *ehc = &ap->link.eh_context;
907 int acpi_sata = ap->flags & ATA_FLAG_ACPI_SATA;
911 if (!dev->acpi_handle)
914 /* do we need to do _GTF? */
915 if (!(dev->flags & ATA_DFLAG_ACPI_PENDING) &&
916 !(acpi_sata && (ehc->i.flags & ATA_EHI_DID_HARDRESET)))
919 /* do _SDD if SATA */
921 rc = ata_acpi_push_id(dev);
927 rc = ata_acpi_exec_tfs(dev, &nr_executed);
931 dev->flags &= ~ATA_DFLAG_ACPI_PENDING;
933 /* refresh IDENTIFY page if any _GTF command has been executed */
935 rc = ata_dev_reread_id(dev, 0);
937 ata_dev_printk(dev, KERN_ERR, "failed to IDENTIFY "
938 "after ACPI commands\n");
946 /* ignore evaluation failure if we can continue safely */
947 if (rc == -EINVAL && !nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
950 /* fail and let EH retry once more for unknown IO errors */
951 if (!(dev->flags & ATA_DFLAG_ACPI_FAILED)) {
952 dev->flags |= ATA_DFLAG_ACPI_FAILED;
956 ata_dev_printk(dev, KERN_WARNING,
957 "ACPI: failed the second time, disabled\n");
958 dev->acpi_handle = NULL;
960 /* We can safely continue if no _GTF command has been executed
961 * and port is not frozen.
963 if (!nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
970 * ata_acpi_on_disable - ATA ACPI hook called when a device is disabled
971 * @dev: target ATA device
973 * This function is called when @dev is about to be disabled.
978 void ata_acpi_on_disable(struct ata_device *dev)
980 ata_acpi_clear_gtf(dev);