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,
32 ATA_ACPI_FILTER_DIPM = 1 << 2,
34 ATA_ACPI_FILTER_DEFAULT = ATA_ACPI_FILTER_SETXFER |
35 ATA_ACPI_FILTER_LOCK |
39 static unsigned int ata_acpi_gtf_filter = ATA_ACPI_FILTER_DEFAULT;
40 module_param_named(acpi_gtf_filter, ata_acpi_gtf_filter, int, 0644);
41 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)");
43 #define NO_PORT_MULT 0xffff
44 #define SATA_ADR(root, pmp) (((root) << 16) | (pmp))
46 #define REGS_PER_GTF 7
48 u8 tf[REGS_PER_GTF]; /* regs. 0x1f1 - 0x1f7 */
52 * Helper - belongs in the PCI layer somewhere eventually
54 static int is_pci_dev(struct device *dev)
56 return (dev->bus == &pci_bus_type);
59 static void ata_acpi_clear_gtf(struct ata_device *dev)
61 kfree(dev->gtf_cache);
62 dev->gtf_cache = NULL;
66 * ata_acpi_associate_sata_port - associate SATA port with ACPI objects
67 * @ap: target SATA port
69 * Look up ACPI objects associated with @ap and initialize acpi_handle
70 * fields of @ap, the port and devices accordingly.
76 * 0 on success, -errno on failure.
78 void ata_acpi_associate_sata_port(struct ata_port *ap)
80 WARN_ON(!(ap->flags & ATA_FLAG_ACPI_SATA));
82 if (!sata_pmp_attached(ap)) {
83 acpi_integer adr = SATA_ADR(ap->port_no, NO_PORT_MULT);
85 ap->link.device->acpi_handle =
86 acpi_get_child(ap->host->acpi_handle, adr);
88 struct ata_link *link;
90 ap->link.device->acpi_handle = NULL;
92 ata_port_for_each_link(link, ap) {
93 acpi_integer adr = SATA_ADR(ap->port_no, link->pmp);
95 link->device->acpi_handle =
96 acpi_get_child(ap->host->acpi_handle, adr);
101 static void ata_acpi_associate_ide_port(struct ata_port *ap)
105 ap->acpi_handle = acpi_get_child(ap->host->acpi_handle, ap->port_no);
106 if (!ap->acpi_handle)
110 if (ap->flags & ATA_FLAG_SLAVE_POSS)
113 for (i = 0; i < max_devices; i++) {
114 struct ata_device *dev = &ap->link.device[i];
116 dev->acpi_handle = acpi_get_child(ap->acpi_handle, i);
119 if (ata_acpi_gtm(ap, &ap->__acpi_init_gtm) == 0)
120 ap->pflags |= ATA_PFLAG_INIT_GTM_VALID;
123 static void ata_acpi_eject_device(acpi_handle handle)
125 struct acpi_object_list arg_list;
126 union acpi_object arg;
129 arg_list.pointer = &arg;
130 arg.type = ACPI_TYPE_INTEGER;
131 arg.integer.value = 1;
133 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_EJ0",
135 printk(KERN_ERR "Failed to evaluate _EJ0!\n");
138 /* @ap and @dev are the same as ata_acpi_handle_hotplug() */
139 static void ata_acpi_detach_device(struct ata_port *ap, struct ata_device *dev)
142 dev->flags |= ATA_DFLAG_DETACH;
144 struct ata_link *tlink;
145 struct ata_device *tdev;
147 ata_port_for_each_link(tlink, ap)
148 ata_link_for_each_dev(tdev, tlink)
149 tdev->flags |= ATA_DFLAG_DETACH;
152 ata_port_schedule_eh(ap);
156 * ata_acpi_handle_hotplug - ACPI event handler backend
157 * @ap: ATA port ACPI event occurred
158 * @dev: ATA device ACPI event occurred (can be NULL)
159 * @event: ACPI event which occurred
160 * @is_dock_event: boolean indicating whether the event was a dock one
162 * All ACPI bay / device realted events end up in this function. If
163 * the event is port-wide @dev is NULL. If the event is specific to a
164 * device, @dev points to it.
166 * Hotplug (as opposed to unplug) notification is always handled as
167 * port-wide while unplug only kills the target device on device-wide
171 * ACPI notify handler context. May sleep.
173 static void ata_acpi_handle_hotplug(struct ata_port *ap, struct ata_device *dev,
174 u32 event, int is_dock_event)
176 char event_string[12];
177 char *envp[] = { event_string, NULL };
178 struct ata_eh_info *ehi = &ap->link.eh_info;
179 struct kobject *kobj = NULL;
182 acpi_handle handle, tmphandle;
188 kobj = &dev->sdev->sdev_gendev.kobj;
189 handle = dev->acpi_handle;
191 kobj = &ap->dev->kobj;
192 handle = ap->acpi_handle;
195 status = acpi_get_handle(handle, "_EJ0", &tmphandle);
196 if (ACPI_FAILURE(status))
197 /* This device does not support hotplug */
200 spin_lock_irqsave(ap->lock, flags);
203 case ACPI_NOTIFY_BUS_CHECK:
204 case ACPI_NOTIFY_DEVICE_CHECK:
205 ata_ehi_push_desc(ehi, "ACPI event");
207 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
208 if (ACPI_FAILURE(status)) {
209 ata_port_printk(ap, KERN_ERR,
210 "acpi: failed to determine bay status (0x%x)\n",
216 ata_ehi_hotplugged(ehi);
219 /* The device has gone - unplug it */
220 ata_acpi_detach_device(ap, dev);
224 case ACPI_NOTIFY_EJECT_REQUEST:
225 ata_ehi_push_desc(ehi, "ACPI event");
230 /* undock event - immediate unplug */
231 ata_acpi_detach_device(ap, dev);
236 /* make sure kobj doesn't go away while ap->lock is released */
239 spin_unlock_irqrestore(ap->lock, flags);
242 ata_port_wait_eh(ap);
243 ata_acpi_eject_device(handle);
246 if (kobj && !is_dock_event) {
247 sprintf(event_string, "BAY_EVENT=%d", event);
248 kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
254 static void ata_acpi_dev_notify_dock(acpi_handle handle, u32 event, void *data)
256 struct ata_device *dev = data;
258 ata_acpi_handle_hotplug(dev->link->ap, dev, event, 1);
261 static void ata_acpi_ap_notify_dock(acpi_handle handle, u32 event, void *data)
263 struct ata_port *ap = data;
265 ata_acpi_handle_hotplug(ap, NULL, event, 1);
268 static void ata_acpi_dev_notify(acpi_handle handle, u32 event, void *data)
270 struct ata_device *dev = data;
272 ata_acpi_handle_hotplug(dev->link->ap, dev, event, 0);
275 static void ata_acpi_ap_notify(acpi_handle handle, u32 event, void *data)
277 struct ata_port *ap = data;
279 ata_acpi_handle_hotplug(ap, NULL, event, 0);
283 * ata_acpi_associate - associate ATA host with ACPI objects
284 * @host: target ATA host
286 * Look up ACPI objects associated with @host and initialize
287 * acpi_handle fields of @host, its ports and devices accordingly.
293 * 0 on success, -errno on failure.
295 void ata_acpi_associate(struct ata_host *host)
299 if (!is_pci_dev(host->dev) || libata_noacpi)
302 host->acpi_handle = DEVICE_ACPI_HANDLE(host->dev);
303 if (!host->acpi_handle)
306 for (i = 0; i < host->n_ports; i++) {
307 struct ata_port *ap = host->ports[i];
309 if (host->ports[0]->flags & ATA_FLAG_ACPI_SATA)
310 ata_acpi_associate_sata_port(ap);
312 ata_acpi_associate_ide_port(ap);
314 if (ap->acpi_handle) {
315 acpi_install_notify_handler(ap->acpi_handle,
317 ata_acpi_ap_notify, ap);
318 /* we might be on a docking station */
319 register_hotplug_dock_device(ap->acpi_handle,
320 ata_acpi_ap_notify_dock, ap);
323 for (j = 0; j < ata_link_max_devices(&ap->link); j++) {
324 struct ata_device *dev = &ap->link.device[j];
326 if (dev->acpi_handle) {
327 acpi_install_notify_handler(dev->acpi_handle,
329 ata_acpi_dev_notify, dev);
330 /* we might be on a docking station */
331 register_hotplug_dock_device(dev->acpi_handle,
332 ata_acpi_dev_notify_dock, dev);
339 * ata_acpi_dissociate - dissociate ATA host from ACPI objects
340 * @host: target ATA host
342 * This function is called during driver detach after the whole host
348 void ata_acpi_dissociate(struct ata_host *host)
352 /* Restore initial _GTM values so that driver which attaches
353 * afterward can use them too.
355 for (i = 0; i < host->n_ports; i++) {
356 struct ata_port *ap = host->ports[i];
357 const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
359 if (ap->acpi_handle && gtm)
360 ata_acpi_stm(ap, gtm);
365 * ata_acpi_gtm - execute _GTM
366 * @ap: target ATA port
367 * @gtm: out parameter for _GTM result
369 * Evaluate _GTM and store the result in @gtm.
375 * 0 on success, -ENOENT if _GTM doesn't exist, -errno on failure.
377 int ata_acpi_gtm(struct ata_port *ap, struct ata_acpi_gtm *gtm)
379 struct acpi_buffer output = { .length = ACPI_ALLOCATE_BUFFER };
380 union acpi_object *out_obj;
384 status = acpi_evaluate_object(ap->acpi_handle, "_GTM", NULL, &output);
387 if (status == AE_NOT_FOUND)
391 if (ACPI_FAILURE(status)) {
392 ata_port_printk(ap, KERN_ERR,
393 "ACPI get timing mode failed (AE 0x%x)\n",
398 out_obj = output.pointer;
399 if (out_obj->type != ACPI_TYPE_BUFFER) {
400 ata_port_printk(ap, KERN_WARNING,
401 "_GTM returned unexpected object type 0x%x\n",
407 if (out_obj->buffer.length != sizeof(struct ata_acpi_gtm)) {
408 ata_port_printk(ap, KERN_ERR,
409 "_GTM returned invalid length %d\n",
410 out_obj->buffer.length);
414 memcpy(gtm, out_obj->buffer.pointer, sizeof(struct ata_acpi_gtm));
417 kfree(output.pointer);
421 EXPORT_SYMBOL_GPL(ata_acpi_gtm);
424 * ata_acpi_stm - execute _STM
425 * @ap: target ATA port
426 * @stm: timing parameter to _STM
428 * Evaluate _STM with timing parameter @stm.
434 * 0 on success, -ENOENT if _STM doesn't exist, -errno on failure.
436 int ata_acpi_stm(struct ata_port *ap, const struct ata_acpi_gtm *stm)
439 struct ata_acpi_gtm stm_buf = *stm;
440 struct acpi_object_list input;
441 union acpi_object in_params[3];
443 in_params[0].type = ACPI_TYPE_BUFFER;
444 in_params[0].buffer.length = sizeof(struct ata_acpi_gtm);
445 in_params[0].buffer.pointer = (u8 *)&stm_buf;
446 /* Buffers for id may need byteswapping ? */
447 in_params[1].type = ACPI_TYPE_BUFFER;
448 in_params[1].buffer.length = 512;
449 in_params[1].buffer.pointer = (u8 *)ap->link.device[0].id;
450 in_params[2].type = ACPI_TYPE_BUFFER;
451 in_params[2].buffer.length = 512;
452 in_params[2].buffer.pointer = (u8 *)ap->link.device[1].id;
455 input.pointer = in_params;
457 status = acpi_evaluate_object(ap->acpi_handle, "_STM", &input, NULL);
459 if (status == AE_NOT_FOUND)
461 if (ACPI_FAILURE(status)) {
462 ata_port_printk(ap, KERN_ERR,
463 "ACPI set timing mode failed (status=0x%x)\n", status);
469 EXPORT_SYMBOL_GPL(ata_acpi_stm);
472 * ata_dev_get_GTF - get the drive bootup default taskfile settings
473 * @dev: target ATA device
474 * @gtf: output parameter for buffer containing _GTF taskfile arrays
476 * This applies to both PATA and SATA drives.
478 * The _GTF method has no input parameters.
479 * It returns a variable number of register set values (registers
480 * hex 1F1..1F7, taskfiles).
481 * The <variable number> is not known in advance, so have ACPI-CA
482 * allocate the buffer as needed and return it, then free it later.
488 * Number of taskfiles on success, 0 if _GTF doesn't exist. -EINVAL
489 * if _GTF is invalid.
491 static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf)
493 struct ata_port *ap = dev->link->ap;
495 struct acpi_buffer output;
496 union acpi_object *out_obj;
499 /* if _GTF is cached, use the cached value */
500 if (dev->gtf_cache) {
501 out_obj = dev->gtf_cache;
505 /* set up output buffer */
506 output.length = ACPI_ALLOCATE_BUFFER;
507 output.pointer = NULL; /* ACPI-CA sets this; save/free it later */
509 if (ata_msg_probe(ap))
510 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
511 __func__, ap->port_no);
513 /* _GTF has no input parameters */
514 status = acpi_evaluate_object(dev->acpi_handle, "_GTF", NULL, &output);
515 out_obj = dev->gtf_cache = output.pointer;
517 if (ACPI_FAILURE(status)) {
518 if (status != AE_NOT_FOUND) {
519 ata_dev_printk(dev, KERN_WARNING,
520 "_GTF evaluation failed (AE 0x%x)\n",
527 if (!output.length || !output.pointer) {
528 if (ata_msg_probe(ap))
529 ata_dev_printk(dev, KERN_DEBUG, "%s: Run _GTF: "
530 "length or ptr is NULL (0x%llx, 0x%p)\n",
532 (unsigned long long)output.length,
538 if (out_obj->type != ACPI_TYPE_BUFFER) {
539 ata_dev_printk(dev, KERN_WARNING,
540 "_GTF unexpected object type 0x%x\n",
546 if (out_obj->buffer.length % REGS_PER_GTF) {
547 ata_dev_printk(dev, KERN_WARNING,
548 "unexpected _GTF length (%d)\n",
549 out_obj->buffer.length);
555 rc = out_obj->buffer.length / REGS_PER_GTF;
557 *gtf = (void *)out_obj->buffer.pointer;
558 if (ata_msg_probe(ap))
559 ata_dev_printk(dev, KERN_DEBUG,
560 "%s: returning gtf=%p, gtf_count=%d\n",
566 ata_acpi_clear_gtf(dev);
571 * ata_acpi_gtm_xfermode - determine xfermode from GTM parameter
572 * @dev: target device
573 * @gtm: GTM parameter to use
575 * Determine xfermask for @dev from @gtm.
581 * Determined xfermask.
583 unsigned long ata_acpi_gtm_xfermask(struct ata_device *dev,
584 const struct ata_acpi_gtm *gtm)
586 unsigned long xfer_mask = 0;
591 /* we always use the 0 slot for crap hardware */
593 if (!(gtm->flags & 0x10))
597 mode = ata_timing_cycle2mode(ATA_SHIFT_PIO, gtm->drive[unit].pio);
598 xfer_mask |= ata_xfer_mode2mask(mode);
600 /* See if we have MWDMA or UDMA data. We don't bother with
601 * MWDMA if UDMA is available as this means the BIOS set UDMA
602 * and our error changedown if it works is UDMA to PIO anyway.
604 if (!(gtm->flags & (1 << (2 * unit))))
605 type = ATA_SHIFT_MWDMA;
607 type = ATA_SHIFT_UDMA;
609 mode = ata_timing_cycle2mode(type, gtm->drive[unit].dma);
610 xfer_mask |= ata_xfer_mode2mask(mode);
614 EXPORT_SYMBOL_GPL(ata_acpi_gtm_xfermask);
617 * ata_acpi_cbl_80wire - Check for 80 wire cable
619 * @gtm: GTM data to use
621 * Return 1 if the @gtm indicates the BIOS selected an 80wire mode.
623 int ata_acpi_cbl_80wire(struct ata_port *ap, const struct ata_acpi_gtm *gtm)
625 struct ata_device *dev;
627 ata_link_for_each_dev(dev, &ap->link) {
628 unsigned long xfer_mask, udma_mask;
630 if (!ata_dev_enabled(dev))
633 xfer_mask = ata_acpi_gtm_xfermask(dev, gtm);
634 ata_unpack_xfermask(xfer_mask, NULL, NULL, &udma_mask);
636 if (udma_mask & ~ATA_UDMA_MASK_40C)
642 EXPORT_SYMBOL_GPL(ata_acpi_cbl_80wire);
644 static void ata_acpi_gtf_to_tf(struct ata_device *dev,
645 const struct ata_acpi_gtf *gtf,
646 struct ata_taskfile *tf)
648 ata_tf_init(dev, tf);
650 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
651 tf->protocol = ATA_PROT_NODATA;
652 tf->feature = gtf->tf[0]; /* 0x1f1 */
653 tf->nsect = gtf->tf[1]; /* 0x1f2 */
654 tf->lbal = gtf->tf[2]; /* 0x1f3 */
655 tf->lbam = gtf->tf[3]; /* 0x1f4 */
656 tf->lbah = gtf->tf[4]; /* 0x1f5 */
657 tf->device = gtf->tf[5]; /* 0x1f6 */
658 tf->command = gtf->tf[6]; /* 0x1f7 */
661 static int ata_acpi_filter_tf(const struct ata_taskfile *tf,
662 const struct ata_taskfile *ptf)
664 if (ata_acpi_gtf_filter & ATA_ACPI_FILTER_SETXFER) {
665 /* libata doesn't use ACPI to configure transfer mode.
666 * It will only confuse device configuration. Skip.
668 if (tf->command == ATA_CMD_SET_FEATURES &&
669 tf->feature == SETFEATURES_XFER)
673 if (ata_acpi_gtf_filter & ATA_ACPI_FILTER_LOCK) {
674 /* BIOS writers, sorry but we don't wanna lock
675 * features unless the user explicitly said so.
678 /* DEVICE CONFIGURATION FREEZE LOCK */
679 if (tf->command == ATA_CMD_CONF_OVERLAY &&
680 tf->feature == ATA_DCO_FREEZE_LOCK)
683 /* SECURITY FREEZE LOCK */
684 if (tf->command == ATA_CMD_SEC_FREEZE_LOCK)
687 /* SET MAX LOCK and SET MAX FREEZE LOCK */
688 if ((!ptf || ptf->command != ATA_CMD_READ_NATIVE_MAX) &&
689 tf->command == ATA_CMD_SET_MAX &&
690 (tf->feature == ATA_SET_MAX_LOCK ||
691 tf->feature == ATA_SET_MAX_FREEZE_LOCK))
695 if (ata_acpi_gtf_filter & ATA_ACPI_FILTER_DIPM) {
696 /* inhibit enabling DIPM */
697 if (tf->command == ATA_CMD_SET_FEATURES &&
698 tf->feature == SETFEATURES_SATA_ENABLE &&
699 tf->nsect == SATA_DIPM)
707 * ata_acpi_run_tf - send taskfile registers to host controller
708 * @dev: target ATA device
709 * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
711 * Outputs ATA taskfile to standard ATA host controller using MMIO
712 * or PIO as indicated by the ATA_FLAG_MMIO flag.
713 * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
714 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
715 * hob_lbal, hob_lbam, and hob_lbah.
717 * This function waits for idle (!BUSY and !DRQ) after writing
718 * registers. If the control register has a new value, this
719 * function also waits for idle after writing control and before
720 * writing the remaining registers.
726 * 1 if command is executed successfully. 0 if ignored, rejected or
727 * filtered out, -errno on other errors.
729 static int ata_acpi_run_tf(struct ata_device *dev,
730 const struct ata_acpi_gtf *gtf,
731 const struct ata_acpi_gtf *prev_gtf)
733 struct ata_taskfile *pptf = NULL;
734 struct ata_taskfile tf, ptf, rtf;
735 unsigned int err_mask;
740 if ((gtf->tf[0] == 0) && (gtf->tf[1] == 0) && (gtf->tf[2] == 0)
741 && (gtf->tf[3] == 0) && (gtf->tf[4] == 0) && (gtf->tf[5] == 0)
742 && (gtf->tf[6] == 0))
745 ata_acpi_gtf_to_tf(dev, gtf, &tf);
747 ata_acpi_gtf_to_tf(dev, prev_gtf, &ptf);
751 if (!ata_acpi_filter_tf(&tf, pptf)) {
753 err_mask = ata_exec_internal(dev, &rtf, NULL,
754 DMA_NONE, NULL, 0, 0);
759 snprintf(msg, sizeof(msg), "succeeded");
765 snprintf(msg, sizeof(msg),
766 "rejected by device (Stat=0x%02x Err=0x%02x)",
767 rtf.command, rtf.feature);
773 snprintf(msg, sizeof(msg),
774 "failed (Emask=0x%x Stat=0x%02x Err=0x%02x)",
775 err_mask, rtf.command, rtf.feature);
781 snprintf(msg, sizeof(msg), "filtered out");
785 ata_dev_printk(dev, level,
786 "ACPI cmd %02x/%02x:%02x:%02x:%02x:%02x:%02x %s\n",
787 tf.command, tf.feature, tf.nsect, tf.lbal,
788 tf.lbam, tf.lbah, tf.device, msg);
794 * ata_acpi_exec_tfs - get then write drive taskfile settings
795 * @dev: target ATA device
796 * @nr_executed: out paramter for the number of executed commands
798 * Evaluate _GTF and excute returned taskfiles.
804 * Number of executed taskfiles on success, 0 if _GTF doesn't exist.
805 * -errno on other errors.
807 static int ata_acpi_exec_tfs(struct ata_device *dev, int *nr_executed)
809 struct ata_acpi_gtf *gtf = NULL, *pgtf = NULL;
810 int gtf_count, i, rc;
813 rc = ata_dev_get_GTF(dev, >f);
819 for (i = 0; i < gtf_count; i++, gtf++) {
820 rc = ata_acpi_run_tf(dev, gtf, pgtf);
829 ata_acpi_clear_gtf(dev);
837 * ata_acpi_push_id - send Identify data to drive
838 * @dev: target ATA device
840 * _SDD ACPI object: for SATA mode only
841 * Must be after Identify (Packet) Device -- uses its data
842 * ATM this function never returns a failure. It is an optional
843 * method and if it fails for whatever reason, we should still
850 * 0 on success, -errno on failure.
852 static int ata_acpi_push_id(struct ata_device *dev)
854 struct ata_port *ap = dev->link->ap;
857 struct acpi_object_list input;
858 union acpi_object in_params[1];
860 if (ata_msg_probe(ap))
861 ata_dev_printk(dev, KERN_DEBUG, "%s: ix = %d, port#: %d\n",
862 __func__, dev->devno, ap->port_no);
864 /* Give the drive Identify data to the drive via the _SDD method */
865 /* _SDD: set up input parameters */
867 input.pointer = in_params;
868 in_params[0].type = ACPI_TYPE_BUFFER;
869 in_params[0].buffer.length = sizeof(dev->id[0]) * ATA_ID_WORDS;
870 in_params[0].buffer.pointer = (u8 *)dev->id;
871 /* Output buffer: _SDD has no output */
873 /* It's OK for _SDD to be missing too. */
874 swap_buf_le16(dev->id, ATA_ID_WORDS);
875 status = acpi_evaluate_object(dev->acpi_handle, "_SDD", &input, NULL);
876 swap_buf_le16(dev->id, ATA_ID_WORDS);
878 err = ACPI_FAILURE(status) ? -EIO : 0;
880 ata_dev_printk(dev, KERN_WARNING,
881 "ACPI _SDD failed (AE 0x%x)\n", status);
887 * ata_acpi_on_suspend - ATA ACPI hook called on suspend
888 * @ap: target ATA port
890 * This function is called when @ap is about to be suspended. All
891 * devices are already put to sleep but the port_suspend() callback
892 * hasn't been executed yet. Error return from this function aborts
899 * 0 on success, -errno on failure.
901 int ata_acpi_on_suspend(struct ata_port *ap)
908 * ata_acpi_on_resume - ATA ACPI hook called on resume
909 * @ap: target ATA port
911 * This function is called when @ap is resumed - right after port
912 * itself is resumed but before any EH action is taken.
917 void ata_acpi_on_resume(struct ata_port *ap)
919 const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
920 struct ata_device *dev;
922 if (ap->acpi_handle && gtm) {
925 /* restore timing parameters */
926 ata_acpi_stm(ap, gtm);
928 /* _GTF should immediately follow _STM so that it can
929 * use values set by _STM. Cache _GTF result and
932 ata_link_for_each_dev(dev, &ap->link) {
933 ata_acpi_clear_gtf(dev);
934 if (ata_dev_enabled(dev) &&
935 ata_dev_get_GTF(dev, NULL) >= 0)
936 dev->flags |= ATA_DFLAG_ACPI_PENDING;
939 /* SATA _GTF needs to be evaulated after _SDD and
940 * there's no reason to evaluate IDE _GTF early
941 * without _STM. Clear cache and schedule _GTF.
943 ata_link_for_each_dev(dev, &ap->link) {
944 ata_acpi_clear_gtf(dev);
945 if (ata_dev_enabled(dev))
946 dev->flags |= ATA_DFLAG_ACPI_PENDING;
952 * ata_acpi_set_state - set the port power state
953 * @ap: target ATA port
954 * @state: state, on/off
956 * This function executes the _PS0/_PS3 ACPI method to set the power state.
957 * ACPI spec requires _PS0 when IDE power on and _PS3 when power off
959 void ata_acpi_set_state(struct ata_port *ap, pm_message_t state)
961 struct ata_device *dev;
963 if (!ap->acpi_handle || (ap->flags & ATA_FLAG_ACPI_SATA))
966 /* channel first and then drives for power on and vica versa
968 if (state.event == PM_EVENT_ON)
969 acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D0);
971 ata_link_for_each_dev(dev, &ap->link) {
972 if (dev->acpi_handle && ata_dev_enabled(dev))
973 acpi_bus_set_power(dev->acpi_handle,
974 state.event == PM_EVENT_ON ?
975 ACPI_STATE_D0 : ACPI_STATE_D3);
977 if (state.event != PM_EVENT_ON)
978 acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D3);
982 * ata_acpi_on_devcfg - ATA ACPI hook called on device donfiguration
983 * @dev: target ATA device
985 * This function is called when @dev is about to be configured.
986 * IDENTIFY data might have been modified after this hook is run.
992 * Positive number if IDENTIFY data needs to be refreshed, 0 if not,
995 int ata_acpi_on_devcfg(struct ata_device *dev)
997 struct ata_port *ap = dev->link->ap;
998 struct ata_eh_context *ehc = &ap->link.eh_context;
999 int acpi_sata = ap->flags & ATA_FLAG_ACPI_SATA;
1000 int nr_executed = 0;
1003 if (!dev->acpi_handle)
1006 /* do we need to do _GTF? */
1007 if (!(dev->flags & ATA_DFLAG_ACPI_PENDING) &&
1008 !(acpi_sata && (ehc->i.flags & ATA_EHI_DID_HARDRESET)))
1011 /* do _SDD if SATA */
1013 rc = ata_acpi_push_id(dev);
1019 rc = ata_acpi_exec_tfs(dev, &nr_executed);
1023 dev->flags &= ~ATA_DFLAG_ACPI_PENDING;
1025 /* refresh IDENTIFY page if any _GTF command has been executed */
1027 rc = ata_dev_reread_id(dev, 0);
1029 ata_dev_printk(dev, KERN_ERR, "failed to IDENTIFY "
1030 "after ACPI commands\n");
1038 /* ignore evaluation failure if we can continue safely */
1039 if (rc == -EINVAL && !nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
1042 /* fail and let EH retry once more for unknown IO errors */
1043 if (!(dev->flags & ATA_DFLAG_ACPI_FAILED)) {
1044 dev->flags |= ATA_DFLAG_ACPI_FAILED;
1048 ata_dev_printk(dev, KERN_WARNING,
1049 "ACPI: failed the second time, disabled\n");
1050 dev->acpi_handle = NULL;
1052 /* We can safely continue if no _GTF command has been executed
1053 * and port is not frozen.
1055 if (!nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
1062 * ata_acpi_on_disable - ATA ACPI hook called when a device is disabled
1063 * @dev: target ATA device
1065 * This function is called when @dev is about to be disabled.
1070 void ata_acpi_on_disable(struct ata_device *dev)
1072 ata_acpi_clear_gtf(dev);