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 <linux/slab.h>
19 #include <scsi/scsi_device.h>
22 #include <acpi/acpi_bus.h>
24 unsigned int ata_acpi_gtf_filter = ATA_ACPI_FILTER_DEFAULT;
25 module_param_named(acpi_gtf_filter, ata_acpi_gtf_filter, int, 0644);
26 MODULE_PARM_DESC(acpi_gtf_filter, "filter mask for ACPI _GTF commands, set to filter out (0x1=set xfermode, 0x2=lock/freeze lock, 0x4=DIPM, 0x8=FPDMA non-zero offset, 0x10=FPDMA DMA Setup FIS auto-activate)");
28 #define NO_PORT_MULT 0xffff
29 #define SATA_ADR(root, pmp) (((root) << 16) | (pmp))
31 #define REGS_PER_GTF 7
33 u8 tf[REGS_PER_GTF]; /* regs. 0x1f1 - 0x1f7 */
37 * Helper - belongs in the PCI layer somewhere eventually
39 static int is_pci_dev(struct device *dev)
41 return (dev->bus == &pci_bus_type);
44 static void ata_acpi_clear_gtf(struct ata_device *dev)
46 kfree(dev->gtf_cache);
47 dev->gtf_cache = NULL;
51 * ata_acpi_associate_sata_port - associate SATA port with ACPI objects
52 * @ap: target SATA port
54 * Look up ACPI objects associated with @ap and initialize acpi_handle
55 * fields of @ap, the port and devices accordingly.
61 * 0 on success, -errno on failure.
63 void ata_acpi_associate_sata_port(struct ata_port *ap)
65 WARN_ON(!(ap->flags & ATA_FLAG_ACPI_SATA));
67 if (!sata_pmp_attached(ap)) {
68 u64 adr = SATA_ADR(ap->port_no, NO_PORT_MULT);
70 ap->link.device->acpi_handle =
71 acpi_get_child(ap->host->acpi_handle, adr);
73 struct ata_link *link;
75 ap->link.device->acpi_handle = NULL;
77 ata_for_each_link(link, ap, EDGE) {
78 u64 adr = SATA_ADR(ap->port_no, link->pmp);
80 link->device->acpi_handle =
81 acpi_get_child(ap->host->acpi_handle, adr);
86 static void ata_acpi_associate_ide_port(struct ata_port *ap)
90 ap->acpi_handle = acpi_get_child(ap->host->acpi_handle, ap->port_no);
95 if (ap->flags & ATA_FLAG_SLAVE_POSS)
98 for (i = 0; i < max_devices; i++) {
99 struct ata_device *dev = &ap->link.device[i];
101 dev->acpi_handle = acpi_get_child(ap->acpi_handle, i);
104 if (ata_acpi_gtm(ap, &ap->__acpi_init_gtm) == 0)
105 ap->pflags |= ATA_PFLAG_INIT_GTM_VALID;
108 /* @ap and @dev are the same as ata_acpi_handle_hotplug() */
109 static void ata_acpi_detach_device(struct ata_port *ap, struct ata_device *dev)
112 dev->flags |= ATA_DFLAG_DETACH;
114 struct ata_link *tlink;
115 struct ata_device *tdev;
117 ata_for_each_link(tlink, ap, EDGE)
118 ata_for_each_dev(tdev, tlink, ALL)
119 tdev->flags |= ATA_DFLAG_DETACH;
122 ata_port_schedule_eh(ap);
126 * ata_acpi_handle_hotplug - ACPI event handler backend
127 * @ap: ATA port ACPI event occurred
128 * @dev: ATA device ACPI event occurred (can be NULL)
129 * @event: ACPI event which occurred
131 * All ACPI bay / device realted events end up in this function. If
132 * the event is port-wide @dev is NULL. If the event is specific to a
133 * device, @dev points to it.
135 * Hotplug (as opposed to unplug) notification is always handled as
136 * port-wide while unplug only kills the target device on device-wide
140 * ACPI notify handler context. May sleep.
142 static void ata_acpi_handle_hotplug(struct ata_port *ap, struct ata_device *dev,
145 struct ata_eh_info *ehi = &ap->link.eh_info;
149 spin_lock_irqsave(ap->lock, flags);
151 * When dock driver calls into the routine, it will always use
152 * ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and
153 * ACPI_NOTIFY_EJECT_REQUEST for remove
156 case ACPI_NOTIFY_BUS_CHECK:
157 case ACPI_NOTIFY_DEVICE_CHECK:
158 ata_ehi_push_desc(ehi, "ACPI event");
160 ata_ehi_hotplugged(ehi);
163 case ACPI_NOTIFY_EJECT_REQUEST:
164 ata_ehi_push_desc(ehi, "ACPI event");
166 ata_acpi_detach_device(ap, dev);
171 spin_unlock_irqrestore(ap->lock, flags);
174 ata_port_wait_eh(ap);
177 static void ata_acpi_dev_notify_dock(acpi_handle handle, u32 event, void *data)
179 struct ata_device *dev = data;
181 ata_acpi_handle_hotplug(dev->link->ap, dev, event);
184 static void ata_acpi_ap_notify_dock(acpi_handle handle, u32 event, void *data)
186 struct ata_port *ap = data;
188 ata_acpi_handle_hotplug(ap, NULL, event);
191 static void ata_acpi_uevent(struct ata_port *ap, struct ata_device *dev,
194 struct kobject *kobj = NULL;
195 char event_string[20];
196 char *envp[] = { event_string, NULL };
200 kobj = &dev->sdev->sdev_gendev.kobj;
202 kobj = &ap->dev->kobj;
205 snprintf(event_string, 20, "BAY_EVENT=%d", event);
206 kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
210 static void ata_acpi_ap_uevent(acpi_handle handle, u32 event, void *data)
212 ata_acpi_uevent(data, NULL, event);
215 static void ata_acpi_dev_uevent(acpi_handle handle, u32 event, void *data)
217 struct ata_device *dev = data;
218 ata_acpi_uevent(dev->link->ap, dev, event);
221 static struct acpi_dock_ops ata_acpi_dev_dock_ops = {
222 .handler = ata_acpi_dev_notify_dock,
223 .uevent = ata_acpi_dev_uevent,
226 static struct acpi_dock_ops ata_acpi_ap_dock_ops = {
227 .handler = ata_acpi_ap_notify_dock,
228 .uevent = ata_acpi_ap_uevent,
232 * ata_acpi_associate - associate ATA host with ACPI objects
233 * @host: target ATA host
235 * Look up ACPI objects associated with @host and initialize
236 * acpi_handle fields of @host, its ports and devices accordingly.
242 * 0 on success, -errno on failure.
244 void ata_acpi_associate(struct ata_host *host)
248 if (!is_pci_dev(host->dev) || libata_noacpi)
251 host->acpi_handle = DEVICE_ACPI_HANDLE(host->dev);
252 if (!host->acpi_handle)
255 for (i = 0; i < host->n_ports; i++) {
256 struct ata_port *ap = host->ports[i];
258 if (host->ports[0]->flags & ATA_FLAG_ACPI_SATA)
259 ata_acpi_associate_sata_port(ap);
261 ata_acpi_associate_ide_port(ap);
263 if (ap->acpi_handle) {
264 /* we might be on a docking station */
265 register_hotplug_dock_device(ap->acpi_handle,
266 &ata_acpi_ap_dock_ops, ap);
269 for (j = 0; j < ata_link_max_devices(&ap->link); j++) {
270 struct ata_device *dev = &ap->link.device[j];
272 if (dev->acpi_handle) {
273 /* we might be on a docking station */
274 register_hotplug_dock_device(dev->acpi_handle,
275 &ata_acpi_dev_dock_ops, dev);
282 * ata_acpi_dissociate - dissociate ATA host from ACPI objects
283 * @host: target ATA host
285 * This function is called during driver detach after the whole host
291 void ata_acpi_dissociate(struct ata_host *host)
295 /* Restore initial _GTM values so that driver which attaches
296 * afterward can use them too.
298 for (i = 0; i < host->n_ports; i++) {
299 struct ata_port *ap = host->ports[i];
300 const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
302 if (ap->acpi_handle && gtm)
303 ata_acpi_stm(ap, gtm);
308 * ata_acpi_gtm - execute _GTM
309 * @ap: target ATA port
310 * @gtm: out parameter for _GTM result
312 * Evaluate _GTM and store the result in @gtm.
318 * 0 on success, -ENOENT if _GTM doesn't exist, -errno on failure.
320 int ata_acpi_gtm(struct ata_port *ap, struct ata_acpi_gtm *gtm)
322 struct acpi_buffer output = { .length = ACPI_ALLOCATE_BUFFER };
323 union acpi_object *out_obj;
327 status = acpi_evaluate_object(ap->acpi_handle, "_GTM", NULL, &output);
330 if (status == AE_NOT_FOUND)
334 if (ACPI_FAILURE(status)) {
335 ata_port_err(ap, "ACPI get timing mode failed (AE 0x%x)\n",
340 out_obj = output.pointer;
341 if (out_obj->type != ACPI_TYPE_BUFFER) {
342 ata_port_warn(ap, "_GTM returned unexpected object type 0x%x\n",
348 if (out_obj->buffer.length != sizeof(struct ata_acpi_gtm)) {
349 ata_port_err(ap, "_GTM returned invalid length %d\n",
350 out_obj->buffer.length);
354 memcpy(gtm, out_obj->buffer.pointer, sizeof(struct ata_acpi_gtm));
357 kfree(output.pointer);
361 EXPORT_SYMBOL_GPL(ata_acpi_gtm);
364 * ata_acpi_stm - execute _STM
365 * @ap: target ATA port
366 * @stm: timing parameter to _STM
368 * Evaluate _STM with timing parameter @stm.
374 * 0 on success, -ENOENT if _STM doesn't exist, -errno on failure.
376 int ata_acpi_stm(struct ata_port *ap, const struct ata_acpi_gtm *stm)
379 struct ata_acpi_gtm stm_buf = *stm;
380 struct acpi_object_list input;
381 union acpi_object in_params[3];
383 in_params[0].type = ACPI_TYPE_BUFFER;
384 in_params[0].buffer.length = sizeof(struct ata_acpi_gtm);
385 in_params[0].buffer.pointer = (u8 *)&stm_buf;
386 /* Buffers for id may need byteswapping ? */
387 in_params[1].type = ACPI_TYPE_BUFFER;
388 in_params[1].buffer.length = 512;
389 in_params[1].buffer.pointer = (u8 *)ap->link.device[0].id;
390 in_params[2].type = ACPI_TYPE_BUFFER;
391 in_params[2].buffer.length = 512;
392 in_params[2].buffer.pointer = (u8 *)ap->link.device[1].id;
395 input.pointer = in_params;
397 status = acpi_evaluate_object(ap->acpi_handle, "_STM", &input, NULL);
399 if (status == AE_NOT_FOUND)
401 if (ACPI_FAILURE(status)) {
402 ata_port_err(ap, "ACPI set timing mode failed (status=0x%x)\n",
409 EXPORT_SYMBOL_GPL(ata_acpi_stm);
412 * ata_dev_get_GTF - get the drive bootup default taskfile settings
413 * @dev: target ATA device
414 * @gtf: output parameter for buffer containing _GTF taskfile arrays
416 * This applies to both PATA and SATA drives.
418 * The _GTF method has no input parameters.
419 * It returns a variable number of register set values (registers
420 * hex 1F1..1F7, taskfiles).
421 * The <variable number> is not known in advance, so have ACPI-CA
422 * allocate the buffer as needed and return it, then free it later.
428 * Number of taskfiles on success, 0 if _GTF doesn't exist. -EINVAL
429 * if _GTF is invalid.
431 static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf)
433 struct ata_port *ap = dev->link->ap;
435 struct acpi_buffer output;
436 union acpi_object *out_obj;
439 /* if _GTF is cached, use the cached value */
440 if (dev->gtf_cache) {
441 out_obj = dev->gtf_cache;
445 /* set up output buffer */
446 output.length = ACPI_ALLOCATE_BUFFER;
447 output.pointer = NULL; /* ACPI-CA sets this; save/free it later */
449 if (ata_msg_probe(ap))
450 ata_dev_dbg(dev, "%s: ENTER: port#: %d\n",
451 __func__, ap->port_no);
453 /* _GTF has no input parameters */
454 status = acpi_evaluate_object(dev->acpi_handle, "_GTF", NULL, &output);
455 out_obj = dev->gtf_cache = output.pointer;
457 if (ACPI_FAILURE(status)) {
458 if (status != AE_NOT_FOUND) {
459 ata_dev_warn(dev, "_GTF evaluation failed (AE 0x%x)\n",
466 if (!output.length || !output.pointer) {
467 if (ata_msg_probe(ap))
468 ata_dev_dbg(dev, "%s: Run _GTF: length or ptr is NULL (0x%llx, 0x%p)\n",
470 (unsigned long long)output.length,
476 if (out_obj->type != ACPI_TYPE_BUFFER) {
477 ata_dev_warn(dev, "_GTF unexpected object type 0x%x\n",
483 if (out_obj->buffer.length % REGS_PER_GTF) {
484 ata_dev_warn(dev, "unexpected _GTF length (%d)\n",
485 out_obj->buffer.length);
491 rc = out_obj->buffer.length / REGS_PER_GTF;
493 *gtf = (void *)out_obj->buffer.pointer;
494 if (ata_msg_probe(ap))
495 ata_dev_dbg(dev, "%s: returning gtf=%p, gtf_count=%d\n",
501 ata_acpi_clear_gtf(dev);
506 * ata_acpi_gtm_xfermode - determine xfermode from GTM parameter
507 * @dev: target device
508 * @gtm: GTM parameter to use
510 * Determine xfermask for @dev from @gtm.
516 * Determined xfermask.
518 unsigned long ata_acpi_gtm_xfermask(struct ata_device *dev,
519 const struct ata_acpi_gtm *gtm)
521 unsigned long xfer_mask = 0;
526 /* we always use the 0 slot for crap hardware */
528 if (!(gtm->flags & 0x10))
532 mode = ata_timing_cycle2mode(ATA_SHIFT_PIO, gtm->drive[unit].pio);
533 xfer_mask |= ata_xfer_mode2mask(mode);
535 /* See if we have MWDMA or UDMA data. We don't bother with
536 * MWDMA if UDMA is available as this means the BIOS set UDMA
537 * and our error changedown if it works is UDMA to PIO anyway.
539 if (!(gtm->flags & (1 << (2 * unit))))
540 type = ATA_SHIFT_MWDMA;
542 type = ATA_SHIFT_UDMA;
544 mode = ata_timing_cycle2mode(type, gtm->drive[unit].dma);
545 xfer_mask |= ata_xfer_mode2mask(mode);
549 EXPORT_SYMBOL_GPL(ata_acpi_gtm_xfermask);
552 * ata_acpi_cbl_80wire - Check for 80 wire cable
554 * @gtm: GTM data to use
556 * Return 1 if the @gtm indicates the BIOS selected an 80wire mode.
558 int ata_acpi_cbl_80wire(struct ata_port *ap, const struct ata_acpi_gtm *gtm)
560 struct ata_device *dev;
562 ata_for_each_dev(dev, &ap->link, ENABLED) {
563 unsigned long xfer_mask, udma_mask;
565 xfer_mask = ata_acpi_gtm_xfermask(dev, gtm);
566 ata_unpack_xfermask(xfer_mask, NULL, NULL, &udma_mask);
568 if (udma_mask & ~ATA_UDMA_MASK_40C)
574 EXPORT_SYMBOL_GPL(ata_acpi_cbl_80wire);
576 static void ata_acpi_gtf_to_tf(struct ata_device *dev,
577 const struct ata_acpi_gtf *gtf,
578 struct ata_taskfile *tf)
580 ata_tf_init(dev, tf);
582 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
583 tf->protocol = ATA_PROT_NODATA;
584 tf->feature = gtf->tf[0]; /* 0x1f1 */
585 tf->nsect = gtf->tf[1]; /* 0x1f2 */
586 tf->lbal = gtf->tf[2]; /* 0x1f3 */
587 tf->lbam = gtf->tf[3]; /* 0x1f4 */
588 tf->lbah = gtf->tf[4]; /* 0x1f5 */
589 tf->device = gtf->tf[5]; /* 0x1f6 */
590 tf->command = gtf->tf[6]; /* 0x1f7 */
593 static int ata_acpi_filter_tf(struct ata_device *dev,
594 const struct ata_taskfile *tf,
595 const struct ata_taskfile *ptf)
597 if (dev->gtf_filter & ATA_ACPI_FILTER_SETXFER) {
598 /* libata doesn't use ACPI to configure transfer mode.
599 * It will only confuse device configuration. Skip.
601 if (tf->command == ATA_CMD_SET_FEATURES &&
602 tf->feature == SETFEATURES_XFER)
606 if (dev->gtf_filter & ATA_ACPI_FILTER_LOCK) {
607 /* BIOS writers, sorry but we don't wanna lock
608 * features unless the user explicitly said so.
611 /* DEVICE CONFIGURATION FREEZE LOCK */
612 if (tf->command == ATA_CMD_CONF_OVERLAY &&
613 tf->feature == ATA_DCO_FREEZE_LOCK)
616 /* SECURITY FREEZE LOCK */
617 if (tf->command == ATA_CMD_SEC_FREEZE_LOCK)
620 /* SET MAX LOCK and SET MAX FREEZE LOCK */
621 if ((!ptf || ptf->command != ATA_CMD_READ_NATIVE_MAX) &&
622 tf->command == ATA_CMD_SET_MAX &&
623 (tf->feature == ATA_SET_MAX_LOCK ||
624 tf->feature == ATA_SET_MAX_FREEZE_LOCK))
628 if (tf->command == ATA_CMD_SET_FEATURES &&
629 tf->feature == SETFEATURES_SATA_ENABLE) {
630 /* inhibit enabling DIPM */
631 if (dev->gtf_filter & ATA_ACPI_FILTER_DIPM &&
632 tf->nsect == SATA_DIPM)
635 /* inhibit FPDMA non-zero offset */
636 if (dev->gtf_filter & ATA_ACPI_FILTER_FPDMA_OFFSET &&
637 (tf->nsect == SATA_FPDMA_OFFSET ||
638 tf->nsect == SATA_FPDMA_IN_ORDER))
641 /* inhibit FPDMA auto activation */
642 if (dev->gtf_filter & ATA_ACPI_FILTER_FPDMA_AA &&
643 tf->nsect == SATA_FPDMA_AA)
651 * ata_acpi_run_tf - send taskfile registers to host controller
652 * @dev: target ATA device
653 * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
655 * Outputs ATA taskfile to standard ATA host controller.
656 * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
657 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
658 * hob_lbal, hob_lbam, and hob_lbah.
660 * This function waits for idle (!BUSY and !DRQ) after writing
661 * registers. If the control register has a new value, this
662 * function also waits for idle after writing control and before
663 * writing the remaining registers.
669 * 1 if command is executed successfully. 0 if ignored, rejected or
670 * filtered out, -errno on other errors.
672 static int ata_acpi_run_tf(struct ata_device *dev,
673 const struct ata_acpi_gtf *gtf,
674 const struct ata_acpi_gtf *prev_gtf)
676 struct ata_taskfile *pptf = NULL;
677 struct ata_taskfile tf, ptf, rtf;
678 unsigned int err_mask;
684 if ((gtf->tf[0] == 0) && (gtf->tf[1] == 0) && (gtf->tf[2] == 0)
685 && (gtf->tf[3] == 0) && (gtf->tf[4] == 0) && (gtf->tf[5] == 0)
686 && (gtf->tf[6] == 0))
689 ata_acpi_gtf_to_tf(dev, gtf, &tf);
691 ata_acpi_gtf_to_tf(dev, prev_gtf, &ptf);
695 if (!ata_acpi_filter_tf(dev, &tf, pptf)) {
697 err_mask = ata_exec_internal(dev, &rtf, NULL,
698 DMA_NONE, NULL, 0, 0);
703 snprintf(msg, sizeof(msg), "succeeded");
709 snprintf(msg, sizeof(msg),
710 "rejected by device (Stat=0x%02x Err=0x%02x)",
711 rtf.command, rtf.feature);
717 snprintf(msg, sizeof(msg),
718 "failed (Emask=0x%x Stat=0x%02x Err=0x%02x)",
719 err_mask, rtf.command, rtf.feature);
725 snprintf(msg, sizeof(msg), "filtered out");
728 descr = ata_get_cmd_descript(tf.command);
730 ata_dev_printk(dev, level,
731 "ACPI cmd %02x/%02x:%02x:%02x:%02x:%02x:%02x (%s) %s\n",
732 tf.command, tf.feature, tf.nsect, tf.lbal,
733 tf.lbam, tf.lbah, tf.device,
734 (descr ? descr : "unknown"), msg);
740 * ata_acpi_exec_tfs - get then write drive taskfile settings
741 * @dev: target ATA device
742 * @nr_executed: out parameter for the number of executed commands
744 * Evaluate _GTF and execute returned taskfiles.
750 * Number of executed taskfiles on success, 0 if _GTF doesn't exist.
751 * -errno on other errors.
753 static int ata_acpi_exec_tfs(struct ata_device *dev, int *nr_executed)
755 struct ata_acpi_gtf *gtf = NULL, *pgtf = NULL;
756 int gtf_count, i, rc;
759 rc = ata_dev_get_GTF(dev, >f);
765 for (i = 0; i < gtf_count; i++, gtf++) {
766 rc = ata_acpi_run_tf(dev, gtf, pgtf);
775 ata_acpi_clear_gtf(dev);
783 * ata_acpi_push_id - send Identify data to drive
784 * @dev: target ATA device
786 * _SDD ACPI object: for SATA mode only
787 * Must be after Identify (Packet) Device -- uses its data
788 * ATM this function never returns a failure. It is an optional
789 * method and if it fails for whatever reason, we should still
796 * 0 on success, -ENOENT if _SDD doesn't exist, -errno on failure.
798 static int ata_acpi_push_id(struct ata_device *dev)
800 struct ata_port *ap = dev->link->ap;
802 struct acpi_object_list input;
803 union acpi_object in_params[1];
805 if (ata_msg_probe(ap))
806 ata_dev_dbg(dev, "%s: ix = %d, port#: %d\n",
807 __func__, dev->devno, ap->port_no);
809 /* Give the drive Identify data to the drive via the _SDD method */
810 /* _SDD: set up input parameters */
812 input.pointer = in_params;
813 in_params[0].type = ACPI_TYPE_BUFFER;
814 in_params[0].buffer.length = sizeof(dev->id[0]) * ATA_ID_WORDS;
815 in_params[0].buffer.pointer = (u8 *)dev->id;
816 /* Output buffer: _SDD has no output */
818 /* It's OK for _SDD to be missing too. */
819 swap_buf_le16(dev->id, ATA_ID_WORDS);
820 status = acpi_evaluate_object(dev->acpi_handle, "_SDD", &input, NULL);
821 swap_buf_le16(dev->id, ATA_ID_WORDS);
823 if (status == AE_NOT_FOUND)
826 if (ACPI_FAILURE(status)) {
827 ata_dev_warn(dev, "ACPI _SDD failed (AE 0x%x)\n", status);
835 * ata_acpi_on_suspend - ATA ACPI hook called on suspend
836 * @ap: target ATA port
838 * This function is called when @ap is about to be suspended. All
839 * devices are already put to sleep but the port_suspend() callback
840 * hasn't been executed yet. Error return from this function aborts
847 * 0 on success, -errno on failure.
849 int ata_acpi_on_suspend(struct ata_port *ap)
856 * ata_acpi_on_resume - ATA ACPI hook called on resume
857 * @ap: target ATA port
859 * This function is called when @ap is resumed - right after port
860 * itself is resumed but before any EH action is taken.
865 void ata_acpi_on_resume(struct ata_port *ap)
867 const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
868 struct ata_device *dev;
870 if (ap->acpi_handle && gtm) {
873 /* restore timing parameters */
874 ata_acpi_stm(ap, gtm);
876 /* _GTF should immediately follow _STM so that it can
877 * use values set by _STM. Cache _GTF result and
880 ata_for_each_dev(dev, &ap->link, ALL) {
881 ata_acpi_clear_gtf(dev);
882 if (ata_dev_enabled(dev) &&
883 ata_dev_get_GTF(dev, NULL) >= 0)
884 dev->flags |= ATA_DFLAG_ACPI_PENDING;
887 /* SATA _GTF needs to be evaulated after _SDD and
888 * there's no reason to evaluate IDE _GTF early
889 * without _STM. Clear cache and schedule _GTF.
891 ata_for_each_dev(dev, &ap->link, ALL) {
892 ata_acpi_clear_gtf(dev);
893 if (ata_dev_enabled(dev))
894 dev->flags |= ATA_DFLAG_ACPI_PENDING;
900 * ata_acpi_set_state - set the port power state
901 * @ap: target ATA port
902 * @state: state, on/off
904 * This function executes the _PS0/_PS3 ACPI method to set the power state.
905 * ACPI spec requires _PS0 when IDE power on and _PS3 when power off
907 void ata_acpi_set_state(struct ata_port *ap, pm_message_t state)
909 struct ata_device *dev;
911 if (!ap->acpi_handle || (ap->flags & ATA_FLAG_ACPI_SATA))
914 /* channel first and then drives for power on and vica versa
916 if (state.event == PM_EVENT_ON)
917 acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D0);
919 ata_for_each_dev(dev, &ap->link, ENABLED) {
920 if (dev->acpi_handle)
921 acpi_bus_set_power(dev->acpi_handle,
922 state.event == PM_EVENT_ON ?
923 ACPI_STATE_D0 : ACPI_STATE_D3);
925 if (state.event != PM_EVENT_ON)
926 acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D3);
930 * ata_acpi_on_devcfg - ATA ACPI hook called on device donfiguration
931 * @dev: target ATA device
933 * This function is called when @dev is about to be configured.
934 * IDENTIFY data might have been modified after this hook is run.
940 * Positive number if IDENTIFY data needs to be refreshed, 0 if not,
943 int ata_acpi_on_devcfg(struct ata_device *dev)
945 struct ata_port *ap = dev->link->ap;
946 struct ata_eh_context *ehc = &ap->link.eh_context;
947 int acpi_sata = ap->flags & ATA_FLAG_ACPI_SATA;
951 if (!dev->acpi_handle)
954 /* do we need to do _GTF? */
955 if (!(dev->flags & ATA_DFLAG_ACPI_PENDING) &&
956 !(acpi_sata && (ehc->i.flags & ATA_EHI_DID_HARDRESET)))
959 /* do _SDD if SATA */
961 rc = ata_acpi_push_id(dev);
962 if (rc && rc != -ENOENT)
967 rc = ata_acpi_exec_tfs(dev, &nr_executed);
971 dev->flags &= ~ATA_DFLAG_ACPI_PENDING;
973 /* refresh IDENTIFY page if any _GTF command has been executed */
975 rc = ata_dev_reread_id(dev, 0);
978 "failed to IDENTIFY after ACPI commands\n");
986 /* ignore evaluation failure if we can continue safely */
987 if (rc == -EINVAL && !nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
990 /* fail and let EH retry once more for unknown IO errors */
991 if (!(dev->flags & ATA_DFLAG_ACPI_FAILED)) {
992 dev->flags |= ATA_DFLAG_ACPI_FAILED;
996 ata_dev_warn(dev, "ACPI: failed the second time, disabled\n");
997 dev->acpi_handle = NULL;
999 /* We can safely continue if no _GTF command has been executed
1000 * and port is not frozen.
1002 if (!nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
1009 * ata_acpi_on_disable - ATA ACPI hook called when a device is disabled
1010 * @dev: target ATA device
1012 * This function is called when @dev is about to be disabled.
1017 void ata_acpi_on_disable(struct ata_device *dev)
1019 ata_acpi_clear_gtf(dev);