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 /* @ap and @dev are the same as ata_acpi_handle_hotplug() */
124 static void ata_acpi_detach_device(struct ata_port *ap, struct ata_device *dev)
127 dev->flags |= ATA_DFLAG_DETACH;
129 struct ata_link *tlink;
130 struct ata_device *tdev;
132 ata_port_for_each_link(tlink, ap)
133 ata_link_for_each_dev(tdev, tlink)
134 tdev->flags |= ATA_DFLAG_DETACH;
137 ata_port_schedule_eh(ap);
141 * ata_acpi_handle_hotplug - ACPI event handler backend
142 * @ap: ATA port ACPI event occurred
143 * @dev: ATA device ACPI event occurred (can be NULL)
144 * @event: ACPI event which occurred
146 * All ACPI bay / device realted events end up in this function. If
147 * the event is port-wide @dev is NULL. If the event is specific to a
148 * device, @dev points to it.
150 * Hotplug (as opposed to unplug) notification is always handled as
151 * port-wide while unplug only kills the target device on device-wide
155 * ACPI notify handler context. May sleep.
157 static void ata_acpi_handle_hotplug(struct ata_port *ap, struct ata_device *dev,
160 struct ata_eh_info *ehi = &ap->link.eh_info;
166 handle = dev->acpi_handle;
168 handle = ap->acpi_handle;
170 spin_lock_irqsave(ap->lock, flags);
172 * When dock driver calls into the routine, it will always use
173 * ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and
174 * ACPI_NOTIFY_EJECT_REQUEST for remove
177 case ACPI_NOTIFY_BUS_CHECK:
178 case ACPI_NOTIFY_DEVICE_CHECK:
179 ata_ehi_push_desc(ehi, "ACPI event");
181 ata_ehi_hotplugged(ehi);
184 case ACPI_NOTIFY_EJECT_REQUEST:
185 ata_ehi_push_desc(ehi, "ACPI event");
187 ata_acpi_detach_device(ap, dev);
192 spin_unlock_irqrestore(ap->lock, flags);
195 ata_port_wait_eh(ap);
198 static void ata_acpi_dev_notify_dock(acpi_handle handle, u32 event, void *data)
200 struct ata_device *dev = data;
202 ata_acpi_handle_hotplug(dev->link->ap, dev, event);
205 static void ata_acpi_ap_notify_dock(acpi_handle handle, u32 event, void *data)
207 struct ata_port *ap = data;
209 ata_acpi_handle_hotplug(ap, NULL, event);
213 * ata_acpi_associate - associate ATA host with ACPI objects
214 * @host: target ATA host
216 * Look up ACPI objects associated with @host and initialize
217 * acpi_handle fields of @host, its ports and devices accordingly.
223 * 0 on success, -errno on failure.
225 void ata_acpi_associate(struct ata_host *host)
229 if (!is_pci_dev(host->dev) || libata_noacpi)
232 host->acpi_handle = DEVICE_ACPI_HANDLE(host->dev);
233 if (!host->acpi_handle)
236 for (i = 0; i < host->n_ports; i++) {
237 struct ata_port *ap = host->ports[i];
239 if (host->ports[0]->flags & ATA_FLAG_ACPI_SATA)
240 ata_acpi_associate_sata_port(ap);
242 ata_acpi_associate_ide_port(ap);
244 if (ap->acpi_handle) {
245 /* we might be on a docking station */
246 register_hotplug_dock_device(ap->acpi_handle,
247 ata_acpi_ap_notify_dock, ap);
250 for (j = 0; j < ata_link_max_devices(&ap->link); j++) {
251 struct ata_device *dev = &ap->link.device[j];
253 if (dev->acpi_handle) {
254 /* we might be on a docking station */
255 register_hotplug_dock_device(dev->acpi_handle,
256 ata_acpi_dev_notify_dock, dev);
263 * ata_acpi_dissociate - dissociate ATA host from ACPI objects
264 * @host: target ATA host
266 * This function is called during driver detach after the whole host
272 void ata_acpi_dissociate(struct ata_host *host)
276 /* Restore initial _GTM values so that driver which attaches
277 * afterward can use them too.
279 for (i = 0; i < host->n_ports; i++) {
280 struct ata_port *ap = host->ports[i];
281 const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
283 if (ap->acpi_handle && gtm)
284 ata_acpi_stm(ap, gtm);
289 * ata_acpi_gtm - execute _GTM
290 * @ap: target ATA port
291 * @gtm: out parameter for _GTM result
293 * Evaluate _GTM and store the result in @gtm.
299 * 0 on success, -ENOENT if _GTM doesn't exist, -errno on failure.
301 int ata_acpi_gtm(struct ata_port *ap, struct ata_acpi_gtm *gtm)
303 struct acpi_buffer output = { .length = ACPI_ALLOCATE_BUFFER };
304 union acpi_object *out_obj;
308 status = acpi_evaluate_object(ap->acpi_handle, "_GTM", NULL, &output);
311 if (status == AE_NOT_FOUND)
315 if (ACPI_FAILURE(status)) {
316 ata_port_printk(ap, KERN_ERR,
317 "ACPI get timing mode failed (AE 0x%x)\n",
322 out_obj = output.pointer;
323 if (out_obj->type != ACPI_TYPE_BUFFER) {
324 ata_port_printk(ap, KERN_WARNING,
325 "_GTM returned unexpected object type 0x%x\n",
331 if (out_obj->buffer.length != sizeof(struct ata_acpi_gtm)) {
332 ata_port_printk(ap, KERN_ERR,
333 "_GTM returned invalid length %d\n",
334 out_obj->buffer.length);
338 memcpy(gtm, out_obj->buffer.pointer, sizeof(struct ata_acpi_gtm));
341 kfree(output.pointer);
345 EXPORT_SYMBOL_GPL(ata_acpi_gtm);
348 * ata_acpi_stm - execute _STM
349 * @ap: target ATA port
350 * @stm: timing parameter to _STM
352 * Evaluate _STM with timing parameter @stm.
358 * 0 on success, -ENOENT if _STM doesn't exist, -errno on failure.
360 int ata_acpi_stm(struct ata_port *ap, const struct ata_acpi_gtm *stm)
363 struct ata_acpi_gtm stm_buf = *stm;
364 struct acpi_object_list input;
365 union acpi_object in_params[3];
367 in_params[0].type = ACPI_TYPE_BUFFER;
368 in_params[0].buffer.length = sizeof(struct ata_acpi_gtm);
369 in_params[0].buffer.pointer = (u8 *)&stm_buf;
370 /* Buffers for id may need byteswapping ? */
371 in_params[1].type = ACPI_TYPE_BUFFER;
372 in_params[1].buffer.length = 512;
373 in_params[1].buffer.pointer = (u8 *)ap->link.device[0].id;
374 in_params[2].type = ACPI_TYPE_BUFFER;
375 in_params[2].buffer.length = 512;
376 in_params[2].buffer.pointer = (u8 *)ap->link.device[1].id;
379 input.pointer = in_params;
381 status = acpi_evaluate_object(ap->acpi_handle, "_STM", &input, NULL);
383 if (status == AE_NOT_FOUND)
385 if (ACPI_FAILURE(status)) {
386 ata_port_printk(ap, KERN_ERR,
387 "ACPI set timing mode failed (status=0x%x)\n", status);
393 EXPORT_SYMBOL_GPL(ata_acpi_stm);
396 * ata_dev_get_GTF - get the drive bootup default taskfile settings
397 * @dev: target ATA device
398 * @gtf: output parameter for buffer containing _GTF taskfile arrays
400 * This applies to both PATA and SATA drives.
402 * The _GTF method has no input parameters.
403 * It returns a variable number of register set values (registers
404 * hex 1F1..1F7, taskfiles).
405 * The <variable number> is not known in advance, so have ACPI-CA
406 * allocate the buffer as needed and return it, then free it later.
412 * Number of taskfiles on success, 0 if _GTF doesn't exist. -EINVAL
413 * if _GTF is invalid.
415 static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf)
417 struct ata_port *ap = dev->link->ap;
419 struct acpi_buffer output;
420 union acpi_object *out_obj;
423 /* if _GTF is cached, use the cached value */
424 if (dev->gtf_cache) {
425 out_obj = dev->gtf_cache;
429 /* set up output buffer */
430 output.length = ACPI_ALLOCATE_BUFFER;
431 output.pointer = NULL; /* ACPI-CA sets this; save/free it later */
433 if (ata_msg_probe(ap))
434 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
435 __func__, ap->port_no);
437 /* _GTF has no input parameters */
438 status = acpi_evaluate_object(dev->acpi_handle, "_GTF", NULL, &output);
439 out_obj = dev->gtf_cache = output.pointer;
441 if (ACPI_FAILURE(status)) {
442 if (status != AE_NOT_FOUND) {
443 ata_dev_printk(dev, KERN_WARNING,
444 "_GTF evaluation failed (AE 0x%x)\n",
451 if (!output.length || !output.pointer) {
452 if (ata_msg_probe(ap))
453 ata_dev_printk(dev, KERN_DEBUG, "%s: Run _GTF: "
454 "length or ptr is NULL (0x%llx, 0x%p)\n",
456 (unsigned long long)output.length,
462 if (out_obj->type != ACPI_TYPE_BUFFER) {
463 ata_dev_printk(dev, KERN_WARNING,
464 "_GTF unexpected object type 0x%x\n",
470 if (out_obj->buffer.length % REGS_PER_GTF) {
471 ata_dev_printk(dev, KERN_WARNING,
472 "unexpected _GTF length (%d)\n",
473 out_obj->buffer.length);
479 rc = out_obj->buffer.length / REGS_PER_GTF;
481 *gtf = (void *)out_obj->buffer.pointer;
482 if (ata_msg_probe(ap))
483 ata_dev_printk(dev, KERN_DEBUG,
484 "%s: returning gtf=%p, gtf_count=%d\n",
490 ata_acpi_clear_gtf(dev);
495 * ata_acpi_gtm_xfermode - determine xfermode from GTM parameter
496 * @dev: target device
497 * @gtm: GTM parameter to use
499 * Determine xfermask for @dev from @gtm.
505 * Determined xfermask.
507 unsigned long ata_acpi_gtm_xfermask(struct ata_device *dev,
508 const struct ata_acpi_gtm *gtm)
510 unsigned long xfer_mask = 0;
515 /* we always use the 0 slot for crap hardware */
517 if (!(gtm->flags & 0x10))
521 mode = ata_timing_cycle2mode(ATA_SHIFT_PIO, gtm->drive[unit].pio);
522 xfer_mask |= ata_xfer_mode2mask(mode);
524 /* See if we have MWDMA or UDMA data. We don't bother with
525 * MWDMA if UDMA is available as this means the BIOS set UDMA
526 * and our error changedown if it works is UDMA to PIO anyway.
528 if (!(gtm->flags & (1 << (2 * unit))))
529 type = ATA_SHIFT_MWDMA;
531 type = ATA_SHIFT_UDMA;
533 mode = ata_timing_cycle2mode(type, gtm->drive[unit].dma);
534 xfer_mask |= ata_xfer_mode2mask(mode);
538 EXPORT_SYMBOL_GPL(ata_acpi_gtm_xfermask);
541 * ata_acpi_cbl_80wire - Check for 80 wire cable
543 * @gtm: GTM data to use
545 * Return 1 if the @gtm indicates the BIOS selected an 80wire mode.
547 int ata_acpi_cbl_80wire(struct ata_port *ap, const struct ata_acpi_gtm *gtm)
549 struct ata_device *dev;
551 ata_link_for_each_dev(dev, &ap->link) {
552 unsigned long xfer_mask, udma_mask;
554 if (!ata_dev_enabled(dev))
557 xfer_mask = ata_acpi_gtm_xfermask(dev, gtm);
558 ata_unpack_xfermask(xfer_mask, NULL, NULL, &udma_mask);
560 if (udma_mask & ~ATA_UDMA_MASK_40C)
566 EXPORT_SYMBOL_GPL(ata_acpi_cbl_80wire);
568 static void ata_acpi_gtf_to_tf(struct ata_device *dev,
569 const struct ata_acpi_gtf *gtf,
570 struct ata_taskfile *tf)
572 ata_tf_init(dev, tf);
574 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
575 tf->protocol = ATA_PROT_NODATA;
576 tf->feature = gtf->tf[0]; /* 0x1f1 */
577 tf->nsect = gtf->tf[1]; /* 0x1f2 */
578 tf->lbal = gtf->tf[2]; /* 0x1f3 */
579 tf->lbam = gtf->tf[3]; /* 0x1f4 */
580 tf->lbah = gtf->tf[4]; /* 0x1f5 */
581 tf->device = gtf->tf[5]; /* 0x1f6 */
582 tf->command = gtf->tf[6]; /* 0x1f7 */
585 static int ata_acpi_filter_tf(const struct ata_taskfile *tf,
586 const struct ata_taskfile *ptf)
588 if (ata_acpi_gtf_filter & ATA_ACPI_FILTER_SETXFER) {
589 /* libata doesn't use ACPI to configure transfer mode.
590 * It will only confuse device configuration. Skip.
592 if (tf->command == ATA_CMD_SET_FEATURES &&
593 tf->feature == SETFEATURES_XFER)
597 if (ata_acpi_gtf_filter & ATA_ACPI_FILTER_LOCK) {
598 /* BIOS writers, sorry but we don't wanna lock
599 * features unless the user explicitly said so.
602 /* DEVICE CONFIGURATION FREEZE LOCK */
603 if (tf->command == ATA_CMD_CONF_OVERLAY &&
604 tf->feature == ATA_DCO_FREEZE_LOCK)
607 /* SECURITY FREEZE LOCK */
608 if (tf->command == ATA_CMD_SEC_FREEZE_LOCK)
611 /* SET MAX LOCK and SET MAX FREEZE LOCK */
612 if ((!ptf || ptf->command != ATA_CMD_READ_NATIVE_MAX) &&
613 tf->command == ATA_CMD_SET_MAX &&
614 (tf->feature == ATA_SET_MAX_LOCK ||
615 tf->feature == ATA_SET_MAX_FREEZE_LOCK))
619 if (ata_acpi_gtf_filter & ATA_ACPI_FILTER_DIPM) {
620 /* inhibit enabling DIPM */
621 if (tf->command == ATA_CMD_SET_FEATURES &&
622 tf->feature == SETFEATURES_SATA_ENABLE &&
623 tf->nsect == SATA_DIPM)
631 * ata_acpi_run_tf - send taskfile registers to host controller
632 * @dev: target ATA device
633 * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
635 * Outputs ATA taskfile to standard ATA host controller using MMIO
636 * or PIO as indicated by the ATA_FLAG_MMIO flag.
637 * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
638 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
639 * hob_lbal, hob_lbam, and hob_lbah.
641 * This function waits for idle (!BUSY and !DRQ) after writing
642 * registers. If the control register has a new value, this
643 * function also waits for idle after writing control and before
644 * writing the remaining registers.
650 * 1 if command is executed successfully. 0 if ignored, rejected or
651 * filtered out, -errno on other errors.
653 static int ata_acpi_run_tf(struct ata_device *dev,
654 const struct ata_acpi_gtf *gtf,
655 const struct ata_acpi_gtf *prev_gtf)
657 struct ata_taskfile *pptf = NULL;
658 struct ata_taskfile tf, ptf, rtf;
659 unsigned int err_mask;
664 if ((gtf->tf[0] == 0) && (gtf->tf[1] == 0) && (gtf->tf[2] == 0)
665 && (gtf->tf[3] == 0) && (gtf->tf[4] == 0) && (gtf->tf[5] == 0)
666 && (gtf->tf[6] == 0))
669 ata_acpi_gtf_to_tf(dev, gtf, &tf);
671 ata_acpi_gtf_to_tf(dev, prev_gtf, &ptf);
675 if (!ata_acpi_filter_tf(&tf, pptf)) {
677 err_mask = ata_exec_internal(dev, &rtf, NULL,
678 DMA_NONE, NULL, 0, 0);
683 snprintf(msg, sizeof(msg), "succeeded");
689 snprintf(msg, sizeof(msg),
690 "rejected by device (Stat=0x%02x Err=0x%02x)",
691 rtf.command, rtf.feature);
697 snprintf(msg, sizeof(msg),
698 "failed (Emask=0x%x Stat=0x%02x Err=0x%02x)",
699 err_mask, rtf.command, rtf.feature);
705 snprintf(msg, sizeof(msg), "filtered out");
709 ata_dev_printk(dev, level,
710 "ACPI cmd %02x/%02x:%02x:%02x:%02x:%02x:%02x %s\n",
711 tf.command, tf.feature, tf.nsect, tf.lbal,
712 tf.lbam, tf.lbah, tf.device, msg);
718 * ata_acpi_exec_tfs - get then write drive taskfile settings
719 * @dev: target ATA device
720 * @nr_executed: out paramter for the number of executed commands
722 * Evaluate _GTF and excute returned taskfiles.
728 * Number of executed taskfiles on success, 0 if _GTF doesn't exist.
729 * -errno on other errors.
731 static int ata_acpi_exec_tfs(struct ata_device *dev, int *nr_executed)
733 struct ata_acpi_gtf *gtf = NULL, *pgtf = NULL;
734 int gtf_count, i, rc;
737 rc = ata_dev_get_GTF(dev, >f);
743 for (i = 0; i < gtf_count; i++, gtf++) {
744 rc = ata_acpi_run_tf(dev, gtf, pgtf);
753 ata_acpi_clear_gtf(dev);
761 * ata_acpi_push_id - send Identify data to drive
762 * @dev: target ATA device
764 * _SDD ACPI object: for SATA mode only
765 * Must be after Identify (Packet) Device -- uses its data
766 * ATM this function never returns a failure. It is an optional
767 * method and if it fails for whatever reason, we should still
774 * 0 on success, -errno on failure.
776 static int ata_acpi_push_id(struct ata_device *dev)
778 struct ata_port *ap = dev->link->ap;
781 struct acpi_object_list input;
782 union acpi_object in_params[1];
784 if (ata_msg_probe(ap))
785 ata_dev_printk(dev, KERN_DEBUG, "%s: ix = %d, port#: %d\n",
786 __func__, dev->devno, ap->port_no);
788 /* Give the drive Identify data to the drive via the _SDD method */
789 /* _SDD: set up input parameters */
791 input.pointer = in_params;
792 in_params[0].type = ACPI_TYPE_BUFFER;
793 in_params[0].buffer.length = sizeof(dev->id[0]) * ATA_ID_WORDS;
794 in_params[0].buffer.pointer = (u8 *)dev->id;
795 /* Output buffer: _SDD has no output */
797 /* It's OK for _SDD to be missing too. */
798 swap_buf_le16(dev->id, ATA_ID_WORDS);
799 status = acpi_evaluate_object(dev->acpi_handle, "_SDD", &input, NULL);
800 swap_buf_le16(dev->id, ATA_ID_WORDS);
802 err = ACPI_FAILURE(status) ? -EIO : 0;
804 ata_dev_printk(dev, KERN_WARNING,
805 "ACPI _SDD failed (AE 0x%x)\n", status);
811 * ata_acpi_on_suspend - ATA ACPI hook called on suspend
812 * @ap: target ATA port
814 * This function is called when @ap is about to be suspended. All
815 * devices are already put to sleep but the port_suspend() callback
816 * hasn't been executed yet. Error return from this function aborts
823 * 0 on success, -errno on failure.
825 int ata_acpi_on_suspend(struct ata_port *ap)
832 * ata_acpi_on_resume - ATA ACPI hook called on resume
833 * @ap: target ATA port
835 * This function is called when @ap is resumed - right after port
836 * itself is resumed but before any EH action is taken.
841 void ata_acpi_on_resume(struct ata_port *ap)
843 const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
844 struct ata_device *dev;
846 if (ap->acpi_handle && gtm) {
849 /* restore timing parameters */
850 ata_acpi_stm(ap, gtm);
852 /* _GTF should immediately follow _STM so that it can
853 * use values set by _STM. Cache _GTF result and
856 ata_link_for_each_dev(dev, &ap->link) {
857 ata_acpi_clear_gtf(dev);
858 if (ata_dev_enabled(dev) &&
859 ata_dev_get_GTF(dev, NULL) >= 0)
860 dev->flags |= ATA_DFLAG_ACPI_PENDING;
863 /* SATA _GTF needs to be evaulated after _SDD and
864 * there's no reason to evaluate IDE _GTF early
865 * without _STM. Clear cache and schedule _GTF.
867 ata_link_for_each_dev(dev, &ap->link) {
868 ata_acpi_clear_gtf(dev);
869 if (ata_dev_enabled(dev))
870 dev->flags |= ATA_DFLAG_ACPI_PENDING;
876 * ata_acpi_set_state - set the port power state
877 * @ap: target ATA port
878 * @state: state, on/off
880 * This function executes the _PS0/_PS3 ACPI method to set the power state.
881 * ACPI spec requires _PS0 when IDE power on and _PS3 when power off
883 void ata_acpi_set_state(struct ata_port *ap, pm_message_t state)
885 struct ata_device *dev;
887 if (!ap->acpi_handle || (ap->flags & ATA_FLAG_ACPI_SATA))
890 /* channel first and then drives for power on and vica versa
892 if (state.event == PM_EVENT_ON)
893 acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D0);
895 ata_link_for_each_dev(dev, &ap->link) {
896 if (dev->acpi_handle && ata_dev_enabled(dev))
897 acpi_bus_set_power(dev->acpi_handle,
898 state.event == PM_EVENT_ON ?
899 ACPI_STATE_D0 : ACPI_STATE_D3);
901 if (state.event != PM_EVENT_ON)
902 acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D3);
906 * ata_acpi_on_devcfg - ATA ACPI hook called on device donfiguration
907 * @dev: target ATA device
909 * This function is called when @dev is about to be configured.
910 * IDENTIFY data might have been modified after this hook is run.
916 * Positive number if IDENTIFY data needs to be refreshed, 0 if not,
919 int ata_acpi_on_devcfg(struct ata_device *dev)
921 struct ata_port *ap = dev->link->ap;
922 struct ata_eh_context *ehc = &ap->link.eh_context;
923 int acpi_sata = ap->flags & ATA_FLAG_ACPI_SATA;
927 if (!dev->acpi_handle)
930 /* do we need to do _GTF? */
931 if (!(dev->flags & ATA_DFLAG_ACPI_PENDING) &&
932 !(acpi_sata && (ehc->i.flags & ATA_EHI_DID_HARDRESET)))
935 /* do _SDD if SATA */
937 rc = ata_acpi_push_id(dev);
943 rc = ata_acpi_exec_tfs(dev, &nr_executed);
947 dev->flags &= ~ATA_DFLAG_ACPI_PENDING;
949 /* refresh IDENTIFY page if any _GTF command has been executed */
951 rc = ata_dev_reread_id(dev, 0);
953 ata_dev_printk(dev, KERN_ERR, "failed to IDENTIFY "
954 "after ACPI commands\n");
962 /* ignore evaluation failure if we can continue safely */
963 if (rc == -EINVAL && !nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
966 /* fail and let EH retry once more for unknown IO errors */
967 if (!(dev->flags & ATA_DFLAG_ACPI_FAILED)) {
968 dev->flags |= ATA_DFLAG_ACPI_FAILED;
972 ata_dev_printk(dev, KERN_WARNING,
973 "ACPI: failed the second time, disabled\n");
974 dev->acpi_handle = NULL;
976 /* We can safely continue if no _GTF command has been executed
977 * and port is not frozen.
979 if (!nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
986 * ata_acpi_on_disable - ATA ACPI hook called when a device is disabled
987 * @dev: target ATA device
989 * This function is called when @dev is about to be disabled.
994 void ata_acpi_on_disable(struct ata_device *dev)
996 ata_acpi_clear_gtf(dev);