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_for_each_link(link, ap, EDGE) {
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_for_each_link(tlink, ap, EDGE)
133 ata_for_each_dev(tdev, tlink, ALL)
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);
212 static void ata_acpi_uevent(struct ata_port *ap, struct ata_device *dev,
215 struct kobject *kobj = NULL;
216 char event_string[20];
217 char *envp[] = { event_string, NULL };
221 kobj = &dev->sdev->sdev_gendev.kobj;
223 kobj = &ap->dev->kobj;
226 snprintf(event_string, 20, "BAY_EVENT=%d", event);
227 kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
231 static void ata_acpi_ap_uevent(acpi_handle handle, u32 event, void *data)
233 ata_acpi_uevent(data, NULL, event);
236 static void ata_acpi_dev_uevent(acpi_handle handle, u32 event, void *data)
238 struct ata_device *dev = data;
239 ata_acpi_uevent(dev->link->ap, dev, event);
242 static struct acpi_dock_ops ata_acpi_dev_dock_ops = {
243 .handler = ata_acpi_dev_notify_dock,
244 .uevent = ata_acpi_dev_uevent,
247 static struct acpi_dock_ops ata_acpi_ap_dock_ops = {
248 .handler = ata_acpi_ap_notify_dock,
249 .uevent = ata_acpi_ap_uevent,
253 * ata_acpi_associate - associate ATA host with ACPI objects
254 * @host: target ATA host
256 * Look up ACPI objects associated with @host and initialize
257 * acpi_handle fields of @host, its ports and devices accordingly.
263 * 0 on success, -errno on failure.
265 void ata_acpi_associate(struct ata_host *host)
269 if (!is_pci_dev(host->dev) || libata_noacpi)
272 host->acpi_handle = DEVICE_ACPI_HANDLE(host->dev);
273 if (!host->acpi_handle)
276 for (i = 0; i < host->n_ports; i++) {
277 struct ata_port *ap = host->ports[i];
279 if (host->ports[0]->flags & ATA_FLAG_ACPI_SATA)
280 ata_acpi_associate_sata_port(ap);
282 ata_acpi_associate_ide_port(ap);
284 if (ap->acpi_handle) {
285 /* we might be on a docking station */
286 register_hotplug_dock_device(ap->acpi_handle,
287 &ata_acpi_ap_dock_ops, ap);
290 for (j = 0; j < ata_link_max_devices(&ap->link); j++) {
291 struct ata_device *dev = &ap->link.device[j];
293 if (dev->acpi_handle) {
294 /* we might be on a docking station */
295 register_hotplug_dock_device(dev->acpi_handle,
296 &ata_acpi_dev_dock_ops, dev);
303 * ata_acpi_dissociate - dissociate ATA host from ACPI objects
304 * @host: target ATA host
306 * This function is called during driver detach after the whole host
312 void ata_acpi_dissociate(struct ata_host *host)
316 /* Restore initial _GTM values so that driver which attaches
317 * afterward can use them too.
319 for (i = 0; i < host->n_ports; i++) {
320 struct ata_port *ap = host->ports[i];
321 const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
323 if (ap->acpi_handle && gtm)
324 ata_acpi_stm(ap, gtm);
329 * ata_acpi_gtm - execute _GTM
330 * @ap: target ATA port
331 * @gtm: out parameter for _GTM result
333 * Evaluate _GTM and store the result in @gtm.
339 * 0 on success, -ENOENT if _GTM doesn't exist, -errno on failure.
341 int ata_acpi_gtm(struct ata_port *ap, struct ata_acpi_gtm *gtm)
343 struct acpi_buffer output = { .length = ACPI_ALLOCATE_BUFFER };
344 union acpi_object *out_obj;
348 status = acpi_evaluate_object(ap->acpi_handle, "_GTM", NULL, &output);
351 if (status == AE_NOT_FOUND)
355 if (ACPI_FAILURE(status)) {
356 ata_port_printk(ap, KERN_ERR,
357 "ACPI get timing mode failed (AE 0x%x)\n",
362 out_obj = output.pointer;
363 if (out_obj->type != ACPI_TYPE_BUFFER) {
364 ata_port_printk(ap, KERN_WARNING,
365 "_GTM returned unexpected object type 0x%x\n",
371 if (out_obj->buffer.length != sizeof(struct ata_acpi_gtm)) {
372 ata_port_printk(ap, KERN_ERR,
373 "_GTM returned invalid length %d\n",
374 out_obj->buffer.length);
378 memcpy(gtm, out_obj->buffer.pointer, sizeof(struct ata_acpi_gtm));
381 kfree(output.pointer);
385 EXPORT_SYMBOL_GPL(ata_acpi_gtm);
388 * ata_acpi_stm - execute _STM
389 * @ap: target ATA port
390 * @stm: timing parameter to _STM
392 * Evaluate _STM with timing parameter @stm.
398 * 0 on success, -ENOENT if _STM doesn't exist, -errno on failure.
400 int ata_acpi_stm(struct ata_port *ap, const struct ata_acpi_gtm *stm)
403 struct ata_acpi_gtm stm_buf = *stm;
404 struct acpi_object_list input;
405 union acpi_object in_params[3];
407 in_params[0].type = ACPI_TYPE_BUFFER;
408 in_params[0].buffer.length = sizeof(struct ata_acpi_gtm);
409 in_params[0].buffer.pointer = (u8 *)&stm_buf;
410 /* Buffers for id may need byteswapping ? */
411 in_params[1].type = ACPI_TYPE_BUFFER;
412 in_params[1].buffer.length = 512;
413 in_params[1].buffer.pointer = (u8 *)ap->link.device[0].id;
414 in_params[2].type = ACPI_TYPE_BUFFER;
415 in_params[2].buffer.length = 512;
416 in_params[2].buffer.pointer = (u8 *)ap->link.device[1].id;
419 input.pointer = in_params;
421 status = acpi_evaluate_object(ap->acpi_handle, "_STM", &input, NULL);
423 if (status == AE_NOT_FOUND)
425 if (ACPI_FAILURE(status)) {
426 ata_port_printk(ap, KERN_ERR,
427 "ACPI set timing mode failed (status=0x%x)\n", status);
433 EXPORT_SYMBOL_GPL(ata_acpi_stm);
436 * ata_dev_get_GTF - get the drive bootup default taskfile settings
437 * @dev: target ATA device
438 * @gtf: output parameter for buffer containing _GTF taskfile arrays
440 * This applies to both PATA and SATA drives.
442 * The _GTF method has no input parameters.
443 * It returns a variable number of register set values (registers
444 * hex 1F1..1F7, taskfiles).
445 * The <variable number> is not known in advance, so have ACPI-CA
446 * allocate the buffer as needed and return it, then free it later.
452 * Number of taskfiles on success, 0 if _GTF doesn't exist. -EINVAL
453 * if _GTF is invalid.
455 static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf)
457 struct ata_port *ap = dev->link->ap;
459 struct acpi_buffer output;
460 union acpi_object *out_obj;
463 /* if _GTF is cached, use the cached value */
464 if (dev->gtf_cache) {
465 out_obj = dev->gtf_cache;
469 /* set up output buffer */
470 output.length = ACPI_ALLOCATE_BUFFER;
471 output.pointer = NULL; /* ACPI-CA sets this; save/free it later */
473 if (ata_msg_probe(ap))
474 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
475 __func__, ap->port_no);
477 /* _GTF has no input parameters */
478 status = acpi_evaluate_object(dev->acpi_handle, "_GTF", NULL, &output);
479 out_obj = dev->gtf_cache = output.pointer;
481 if (ACPI_FAILURE(status)) {
482 if (status != AE_NOT_FOUND) {
483 ata_dev_printk(dev, KERN_WARNING,
484 "_GTF evaluation failed (AE 0x%x)\n",
491 if (!output.length || !output.pointer) {
492 if (ata_msg_probe(ap))
493 ata_dev_printk(dev, KERN_DEBUG, "%s: Run _GTF: "
494 "length or ptr is NULL (0x%llx, 0x%p)\n",
496 (unsigned long long)output.length,
502 if (out_obj->type != ACPI_TYPE_BUFFER) {
503 ata_dev_printk(dev, KERN_WARNING,
504 "_GTF unexpected object type 0x%x\n",
510 if (out_obj->buffer.length % REGS_PER_GTF) {
511 ata_dev_printk(dev, KERN_WARNING,
512 "unexpected _GTF length (%d)\n",
513 out_obj->buffer.length);
519 rc = out_obj->buffer.length / REGS_PER_GTF;
521 *gtf = (void *)out_obj->buffer.pointer;
522 if (ata_msg_probe(ap))
523 ata_dev_printk(dev, KERN_DEBUG,
524 "%s: returning gtf=%p, gtf_count=%d\n",
530 ata_acpi_clear_gtf(dev);
535 * ata_acpi_gtm_xfermode - determine xfermode from GTM parameter
536 * @dev: target device
537 * @gtm: GTM parameter to use
539 * Determine xfermask for @dev from @gtm.
545 * Determined xfermask.
547 unsigned long ata_acpi_gtm_xfermask(struct ata_device *dev,
548 const struct ata_acpi_gtm *gtm)
550 unsigned long xfer_mask = 0;
555 /* we always use the 0 slot for crap hardware */
557 if (!(gtm->flags & 0x10))
561 mode = ata_timing_cycle2mode(ATA_SHIFT_PIO, gtm->drive[unit].pio);
562 xfer_mask |= ata_xfer_mode2mask(mode);
564 /* See if we have MWDMA or UDMA data. We don't bother with
565 * MWDMA if UDMA is available as this means the BIOS set UDMA
566 * and our error changedown if it works is UDMA to PIO anyway.
568 if (!(gtm->flags & (1 << (2 * unit))))
569 type = ATA_SHIFT_MWDMA;
571 type = ATA_SHIFT_UDMA;
573 mode = ata_timing_cycle2mode(type, gtm->drive[unit].dma);
574 xfer_mask |= ata_xfer_mode2mask(mode);
578 EXPORT_SYMBOL_GPL(ata_acpi_gtm_xfermask);
581 * ata_acpi_cbl_80wire - Check for 80 wire cable
583 * @gtm: GTM data to use
585 * Return 1 if the @gtm indicates the BIOS selected an 80wire mode.
587 int ata_acpi_cbl_80wire(struct ata_port *ap, const struct ata_acpi_gtm *gtm)
589 struct ata_device *dev;
591 ata_for_each_dev(dev, &ap->link, ENABLED) {
592 unsigned long xfer_mask, udma_mask;
594 xfer_mask = ata_acpi_gtm_xfermask(dev, gtm);
595 ata_unpack_xfermask(xfer_mask, NULL, NULL, &udma_mask);
597 if (udma_mask & ~ATA_UDMA_MASK_40C)
603 EXPORT_SYMBOL_GPL(ata_acpi_cbl_80wire);
605 static void ata_acpi_gtf_to_tf(struct ata_device *dev,
606 const struct ata_acpi_gtf *gtf,
607 struct ata_taskfile *tf)
609 ata_tf_init(dev, tf);
611 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
612 tf->protocol = ATA_PROT_NODATA;
613 tf->feature = gtf->tf[0]; /* 0x1f1 */
614 tf->nsect = gtf->tf[1]; /* 0x1f2 */
615 tf->lbal = gtf->tf[2]; /* 0x1f3 */
616 tf->lbam = gtf->tf[3]; /* 0x1f4 */
617 tf->lbah = gtf->tf[4]; /* 0x1f5 */
618 tf->device = gtf->tf[5]; /* 0x1f6 */
619 tf->command = gtf->tf[6]; /* 0x1f7 */
622 static int ata_acpi_filter_tf(const struct ata_taskfile *tf,
623 const struct ata_taskfile *ptf)
625 if (ata_acpi_gtf_filter & ATA_ACPI_FILTER_SETXFER) {
626 /* libata doesn't use ACPI to configure transfer mode.
627 * It will only confuse device configuration. Skip.
629 if (tf->command == ATA_CMD_SET_FEATURES &&
630 tf->feature == SETFEATURES_XFER)
634 if (ata_acpi_gtf_filter & ATA_ACPI_FILTER_LOCK) {
635 /* BIOS writers, sorry but we don't wanna lock
636 * features unless the user explicitly said so.
639 /* DEVICE CONFIGURATION FREEZE LOCK */
640 if (tf->command == ATA_CMD_CONF_OVERLAY &&
641 tf->feature == ATA_DCO_FREEZE_LOCK)
644 /* SECURITY FREEZE LOCK */
645 if (tf->command == ATA_CMD_SEC_FREEZE_LOCK)
648 /* SET MAX LOCK and SET MAX FREEZE LOCK */
649 if ((!ptf || ptf->command != ATA_CMD_READ_NATIVE_MAX) &&
650 tf->command == ATA_CMD_SET_MAX &&
651 (tf->feature == ATA_SET_MAX_LOCK ||
652 tf->feature == ATA_SET_MAX_FREEZE_LOCK))
656 if (ata_acpi_gtf_filter & ATA_ACPI_FILTER_DIPM) {
657 /* inhibit enabling DIPM */
658 if (tf->command == ATA_CMD_SET_FEATURES &&
659 tf->feature == SETFEATURES_SATA_ENABLE &&
660 tf->nsect == SATA_DIPM)
668 * ata_acpi_run_tf - send taskfile registers to host controller
669 * @dev: target ATA device
670 * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
672 * Outputs ATA taskfile to standard ATA host controller using MMIO
673 * or PIO as indicated by the ATA_FLAG_MMIO flag.
674 * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
675 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
676 * hob_lbal, hob_lbam, and hob_lbah.
678 * This function waits for idle (!BUSY and !DRQ) after writing
679 * registers. If the control register has a new value, this
680 * function also waits for idle after writing control and before
681 * writing the remaining registers.
687 * 1 if command is executed successfully. 0 if ignored, rejected or
688 * filtered out, -errno on other errors.
690 static int ata_acpi_run_tf(struct ata_device *dev,
691 const struct ata_acpi_gtf *gtf,
692 const struct ata_acpi_gtf *prev_gtf)
694 struct ata_taskfile *pptf = NULL;
695 struct ata_taskfile tf, ptf, rtf;
696 unsigned int err_mask;
701 if ((gtf->tf[0] == 0) && (gtf->tf[1] == 0) && (gtf->tf[2] == 0)
702 && (gtf->tf[3] == 0) && (gtf->tf[4] == 0) && (gtf->tf[5] == 0)
703 && (gtf->tf[6] == 0))
706 ata_acpi_gtf_to_tf(dev, gtf, &tf);
708 ata_acpi_gtf_to_tf(dev, prev_gtf, &ptf);
712 if (!ata_acpi_filter_tf(&tf, pptf)) {
714 err_mask = ata_exec_internal(dev, &rtf, NULL,
715 DMA_NONE, NULL, 0, 0);
720 snprintf(msg, sizeof(msg), "succeeded");
726 snprintf(msg, sizeof(msg),
727 "rejected by device (Stat=0x%02x Err=0x%02x)",
728 rtf.command, rtf.feature);
734 snprintf(msg, sizeof(msg),
735 "failed (Emask=0x%x Stat=0x%02x Err=0x%02x)",
736 err_mask, rtf.command, rtf.feature);
742 snprintf(msg, sizeof(msg), "filtered out");
746 ata_dev_printk(dev, level,
747 "ACPI cmd %02x/%02x:%02x:%02x:%02x:%02x:%02x %s\n",
748 tf.command, tf.feature, tf.nsect, tf.lbal,
749 tf.lbam, tf.lbah, tf.device, msg);
755 * ata_acpi_exec_tfs - get then write drive taskfile settings
756 * @dev: target ATA device
757 * @nr_executed: out paramter for the number of executed commands
759 * Evaluate _GTF and excute returned taskfiles.
765 * Number of executed taskfiles on success, 0 if _GTF doesn't exist.
766 * -errno on other errors.
768 static int ata_acpi_exec_tfs(struct ata_device *dev, int *nr_executed)
770 struct ata_acpi_gtf *gtf = NULL, *pgtf = NULL;
771 int gtf_count, i, rc;
774 rc = ata_dev_get_GTF(dev, >f);
780 for (i = 0; i < gtf_count; i++, gtf++) {
781 rc = ata_acpi_run_tf(dev, gtf, pgtf);
790 ata_acpi_clear_gtf(dev);
798 * ata_acpi_push_id - send Identify data to drive
799 * @dev: target ATA device
801 * _SDD ACPI object: for SATA mode only
802 * Must be after Identify (Packet) Device -- uses its data
803 * ATM this function never returns a failure. It is an optional
804 * method and if it fails for whatever reason, we should still
811 * 0 on success, -errno on failure.
813 static int ata_acpi_push_id(struct ata_device *dev)
815 struct ata_port *ap = dev->link->ap;
818 struct acpi_object_list input;
819 union acpi_object in_params[1];
821 if (ata_msg_probe(ap))
822 ata_dev_printk(dev, KERN_DEBUG, "%s: ix = %d, port#: %d\n",
823 __func__, dev->devno, ap->port_no);
825 /* Give the drive Identify data to the drive via the _SDD method */
826 /* _SDD: set up input parameters */
828 input.pointer = in_params;
829 in_params[0].type = ACPI_TYPE_BUFFER;
830 in_params[0].buffer.length = sizeof(dev->id[0]) * ATA_ID_WORDS;
831 in_params[0].buffer.pointer = (u8 *)dev->id;
832 /* Output buffer: _SDD has no output */
834 /* It's OK for _SDD to be missing too. */
835 swap_buf_le16(dev->id, ATA_ID_WORDS);
836 status = acpi_evaluate_object(dev->acpi_handle, "_SDD", &input, NULL);
837 swap_buf_le16(dev->id, ATA_ID_WORDS);
839 err = ACPI_FAILURE(status) ? -EIO : 0;
841 ata_dev_printk(dev, KERN_WARNING,
842 "ACPI _SDD failed (AE 0x%x)\n", status);
848 * ata_acpi_on_suspend - ATA ACPI hook called on suspend
849 * @ap: target ATA port
851 * This function is called when @ap is about to be suspended. All
852 * devices are already put to sleep but the port_suspend() callback
853 * hasn't been executed yet. Error return from this function aborts
860 * 0 on success, -errno on failure.
862 int ata_acpi_on_suspend(struct ata_port *ap)
869 * ata_acpi_on_resume - ATA ACPI hook called on resume
870 * @ap: target ATA port
872 * This function is called when @ap is resumed - right after port
873 * itself is resumed but before any EH action is taken.
878 void ata_acpi_on_resume(struct ata_port *ap)
880 const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
881 struct ata_device *dev;
883 if (ap->acpi_handle && gtm) {
886 /* restore timing parameters */
887 ata_acpi_stm(ap, gtm);
889 /* _GTF should immediately follow _STM so that it can
890 * use values set by _STM. Cache _GTF result and
893 ata_for_each_dev(dev, &ap->link, ALL) {
894 ata_acpi_clear_gtf(dev);
895 if (ata_dev_enabled(dev) &&
896 ata_dev_get_GTF(dev, NULL) >= 0)
897 dev->flags |= ATA_DFLAG_ACPI_PENDING;
900 /* SATA _GTF needs to be evaulated after _SDD and
901 * there's no reason to evaluate IDE _GTF early
902 * without _STM. Clear cache and schedule _GTF.
904 ata_for_each_dev(dev, &ap->link, ALL) {
905 ata_acpi_clear_gtf(dev);
906 if (ata_dev_enabled(dev))
907 dev->flags |= ATA_DFLAG_ACPI_PENDING;
913 * ata_acpi_set_state - set the port power state
914 * @ap: target ATA port
915 * @state: state, on/off
917 * This function executes the _PS0/_PS3 ACPI method to set the power state.
918 * ACPI spec requires _PS0 when IDE power on and _PS3 when power off
920 void ata_acpi_set_state(struct ata_port *ap, pm_message_t state)
922 struct ata_device *dev;
924 if (!ap->acpi_handle || (ap->flags & ATA_FLAG_ACPI_SATA))
927 /* channel first and then drives for power on and vica versa
929 if (state.event == PM_EVENT_ON)
930 acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D0);
932 ata_for_each_dev(dev, &ap->link, ENABLED) {
933 if (dev->acpi_handle)
934 acpi_bus_set_power(dev->acpi_handle,
935 state.event == PM_EVENT_ON ?
936 ACPI_STATE_D0 : ACPI_STATE_D3);
938 if (state.event != PM_EVENT_ON)
939 acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D3);
943 * ata_acpi_on_devcfg - ATA ACPI hook called on device donfiguration
944 * @dev: target ATA device
946 * This function is called when @dev is about to be configured.
947 * IDENTIFY data might have been modified after this hook is run.
953 * Positive number if IDENTIFY data needs to be refreshed, 0 if not,
956 int ata_acpi_on_devcfg(struct ata_device *dev)
958 struct ata_port *ap = dev->link->ap;
959 struct ata_eh_context *ehc = &ap->link.eh_context;
960 int acpi_sata = ap->flags & ATA_FLAG_ACPI_SATA;
964 if (!dev->acpi_handle)
967 /* do we need to do _GTF? */
968 if (!(dev->flags & ATA_DFLAG_ACPI_PENDING) &&
969 !(acpi_sata && (ehc->i.flags & ATA_EHI_DID_HARDRESET)))
972 /* do _SDD if SATA */
974 rc = ata_acpi_push_id(dev);
980 rc = ata_acpi_exec_tfs(dev, &nr_executed);
984 dev->flags &= ~ATA_DFLAG_ACPI_PENDING;
986 /* refresh IDENTIFY page if any _GTF command has been executed */
988 rc = ata_dev_reread_id(dev, 0);
990 ata_dev_printk(dev, KERN_ERR, "failed to IDENTIFY "
991 "after ACPI commands\n");
999 /* ignore evaluation failure if we can continue safely */
1000 if (rc == -EINVAL && !nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
1003 /* fail and let EH retry once more for unknown IO errors */
1004 if (!(dev->flags & ATA_DFLAG_ACPI_FAILED)) {
1005 dev->flags |= ATA_DFLAG_ACPI_FAILED;
1009 ata_dev_printk(dev, KERN_WARNING,
1010 "ACPI: failed the second time, disabled\n");
1011 dev->acpi_handle = NULL;
1013 /* We can safely continue if no _GTF command has been executed
1014 * and port is not frozen.
1016 if (!nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
1023 * ata_acpi_on_disable - ATA ACPI hook called when a device is disabled
1024 * @dev: target ATA device
1026 * This function is called when @dev is about to be disabled.
1031 void ata_acpi_on_disable(struct ata_device *dev)
1033 ata_acpi_clear_gtf(dev);