[linux.git] / drivers / ide / ide-pm.c

#include <linux/kernel.h>
#include <linux/ide.h>

int generic_ide_suspend(struct device *dev, pm_message_t mesg)
{
	ide_drive_t *drive = dev_get_drvdata(dev);
	ide_drive_t *pair = ide_get_pair_dev(drive);
	ide_hwif_t *hwif = drive->hwif;
	struct request *rq;
	struct request_pm_state rqpm;
	int ret;

	if (ide_port_acpi(hwif)) {
		/* call ACPI _GTM only once */
		if ((drive->dn & 1) == 0 || pair == NULL)
			ide_acpi_get_timing(hwif);
	}

	memset(&rqpm, 0, sizeof(rqpm));
	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	rq->cmd_type = REQ_TYPE_PM_SUSPEND;
	rq->special = &rqpm;
	rqpm.pm_step = IDE_PM_START_SUSPEND;
	if (mesg.event == PM_EVENT_PRETHAW)
		mesg.event = PM_EVENT_FREEZE;
	rqpm.pm_state = mesg.event;

	ret = blk_execute_rq(drive->queue, NULL, rq, 0);
	blk_put_request(rq);

	if (ret == 0 && ide_port_acpi(hwif)) {
		/* call ACPI _PS3 only after both devices are suspended */
		if ((drive->dn & 1) || pair == NULL)
			ide_acpi_set_state(hwif, 0);
	}

	return ret;
}

int generic_ide_resume(struct device *dev)
{
	ide_drive_t *drive = dev_get_drvdata(dev);
	ide_drive_t *pair = ide_get_pair_dev(drive);
	ide_hwif_t *hwif = drive->hwif;
	struct request *rq;
	struct request_pm_state rqpm;
	int err;

	if (ide_port_acpi(hwif)) {
		/* call ACPI _PS0 / _STM only once */
		if ((drive->dn & 1) == 0 || pair == NULL) {
			ide_acpi_set_state(hwif, 1);
			ide_acpi_push_timing(hwif);
		}

		ide_acpi_exec_tfs(drive);
	}

	memset(&rqpm, 0, sizeof(rqpm));
	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	rq->cmd_type = REQ_TYPE_PM_RESUME;
	rq->cmd_flags |= REQ_PREEMPT;
	rq->special = &rqpm;
	rqpm.pm_step = IDE_PM_START_RESUME;
	rqpm.pm_state = PM_EVENT_ON;

	err = blk_execute_rq(drive->queue, NULL, rq, 1);
	blk_put_request(rq);

	if (err == 0 && dev->driver) {
		struct ide_driver *drv = to_ide_driver(dev->driver);

		if (drv->resume)
			drv->resume(drive);
	}

	return err;
}

void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
{
	struct request_pm_state *pm = rq->special;

#ifdef DEBUG_PM
	printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
		drive->name, pm->pm_step);
#endif
	if (drive->media != ide_disk)
		return;

	switch (pm->pm_step) {
	case IDE_PM_FLUSH_CACHE:	/* Suspend step 1 (flush cache) */
		if (pm->pm_state == PM_EVENT_FREEZE)
			pm->pm_step = IDE_PM_COMPLETED;
		else
			pm->pm_step = IDE_PM_STANDBY;
		break;
	case IDE_PM_STANDBY:		/* Suspend step 2 (standby) */
		pm->pm_step = IDE_PM_COMPLETED;
		break;
	case IDE_PM_RESTORE_PIO:	/* Resume step 1 (restore PIO) */
		pm->pm_step = IDE_PM_IDLE;
		break;
	case IDE_PM_IDLE:		/* Resume step 2 (idle)*/
		pm->pm_step = IDE_PM_RESTORE_DMA;
		break;
	}
}

ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
{
	struct request_pm_state *pm = rq->special;
	struct ide_cmd cmd = { };

	switch (pm->pm_step) {
	case IDE_PM_FLUSH_CACHE:	/* Suspend step 1 (flush cache) */
		if (drive->media != ide_disk)
			break;
		/* Not supported? Switch to next step now. */
		if (ata_id_flush_enabled(drive->id) == 0 ||
		    (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
			ide_complete_power_step(drive, rq);
			return ide_stopped;
		}
		if (ata_id_flush_ext_enabled(drive->id))
			cmd.tf.command = ATA_CMD_FLUSH_EXT;
		else
			cmd.tf.command = ATA_CMD_FLUSH;
		goto out_do_tf;
	case IDE_PM_STANDBY:		/* Suspend step 2 (standby) */
		cmd.tf.command = ATA_CMD_STANDBYNOW1;
		goto out_do_tf;
	case IDE_PM_RESTORE_PIO:	/* Resume step 1 (restore PIO) */
		ide_set_max_pio(drive);
		/*
		 * skip IDE_PM_IDLE for ATAPI devices
		 */
		if (drive->media != ide_disk)
			pm->pm_step = IDE_PM_RESTORE_DMA;
		else
			ide_complete_power_step(drive, rq);
		return ide_stopped;
	case IDE_PM_IDLE:		/* Resume step 2 (idle) */
		cmd.tf.command = ATA_CMD_IDLEIMMEDIATE;
		goto out_do_tf;
	case IDE_PM_RESTORE_DMA:	/* Resume step 3 (restore DMA) */
		/*
		 * Right now, all we do is call ide_set_dma(drive),
		 * we could be smarter and check for current xfer_speed
		 * in struct drive etc...
		 */
		if (drive->hwif->dma_ops == NULL)
			break;
		/*
		 * TODO: respect IDE_DFLAG_USING_DMA
		 */
		ide_set_dma(drive);
		break;
	}

	pm->pm_step = IDE_PM_COMPLETED;

	return ide_stopped;

out_do_tf:
	cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
	cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
	cmd.protocol = ATA_PROT_NODATA;

	return do_rw_taskfile(drive, &cmd);
}

/**
 *	ide_complete_pm_rq - end the current Power Management request
 *	@drive: target drive
 *	@rq: request
 *
 *	This function cleans up the current PM request and stops the queue
 *	if necessary.
 */
void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
{
	struct request_queue *q = drive->queue;
	struct request_pm_state *pm = rq->special;
	unsigned long flags;

	ide_complete_power_step(drive, rq);
	if (pm->pm_step != IDE_PM_COMPLETED)
		return;

#ifdef DEBUG_PM
	printk("%s: completing PM request, %s\n", drive->name,
	       blk_pm_suspend_request(rq) ? "suspend" : "resume");
#endif
	spin_lock_irqsave(q->queue_lock, flags);
	if (blk_pm_suspend_request(rq))
		blk_stop_queue(q);
	else
		drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
	spin_unlock_irqrestore(q->queue_lock, flags);

	drive->hwif->rq = NULL;

	if (blk_end_request(rq, 0, 0))
		BUG();
}

void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
{
	struct request_pm_state *pm = rq->special;

	if (blk_pm_suspend_request(rq) &&
	    pm->pm_step == IDE_PM_START_SUSPEND)
		/* Mark drive blocked when starting the suspend sequence. */
		drive->dev_flags |= IDE_DFLAG_BLOCKED;
	else if (blk_pm_resume_request(rq) &&
		 pm->pm_step == IDE_PM_START_RESUME) {
		/*
		 * The first thing we do on wakeup is to wait for BSY bit to
		 * go away (with a looong timeout) as a drive on this hwif may
		 * just be POSTing itself.
		 * We do that before even selecting as the "other" device on
		 * the bus may be broken enough to walk on our toes at this
		 * point.
		 */
		ide_hwif_t *hwif = drive->hwif;
		const struct ide_tp_ops *tp_ops = hwif->tp_ops;
		struct request_queue *q = drive->queue;
		unsigned long flags;
		int rc;
#ifdef DEBUG_PM
		printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
#endif
		rc = ide_wait_not_busy(hwif, 35000);
		if (rc)
			printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
		tp_ops->dev_select(drive);
		tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
		rc = ide_wait_not_busy(hwif, 100000);
		if (rc)
			printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);

		spin_lock_irqsave(q->queue_lock, flags);
		blk_start_queue(q);
		spin_unlock_irqrestore(q->queue_lock, flags);
	}
}
Commit	Line	Data
e2984c62 BZ	1	#include <linux/kernel.h>
e2984c62 BZ	2	#include <linux/ide.h>
e2984c62 BZ	3
	4	int generic_ide_suspend(struct device *dev, pm_message_t mesg)
	5	{
fcb52077 GKH	6	ide_drive_t *drive = dev_get_drvdata(dev);
fcb52077 GKH	7	ide_drive_t *pair = ide_get_pair_dev(drive);
898ec223	8	ide_hwif_t *hwif = drive->hwif;
e2984c62 BZ	9	struct request *rq;
e2984c62 BZ	10	struct request_pm_state rqpm;
e2984c62 BZ	11	int ret;
e2984c62 BZ	12
2bf427b2 BZ	13	if (ide_port_acpi(hwif)) {
	14	/* call ACPI _GTM only once */
	15	if ((drive->dn & 1) == 0 \|\| pair == NULL)
	16	ide_acpi_get_timing(hwif);
	17	}
e2984c62 BZ	18
e2984c62 BZ	19	memset(&rqpm, 0, sizeof(rqpm));
e2984c62 BZ	20	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
e2984c62 BZ	21	rq->cmd_type = REQ_TYPE_PM_SUSPEND;
fc38b521	22	rq->special = &rqpm;
e2984c62 BZ	23	rqpm.pm_step = IDE_PM_START_SUSPEND;
	24	if (mesg.event == PM_EVENT_PRETHAW)
	25	mesg.event = PM_EVENT_FREEZE;
	26	rqpm.pm_state = mesg.event;
	27
	28	ret = blk_execute_rq(drive->queue, NULL, rq, 0);
	29	blk_put_request(rq);
	30
2bf427b2 BZ	31	if (ret == 0 && ide_port_acpi(hwif)) {
	32	/* call ACPI _PS3 only after both devices are suspended */
	33	if ((drive->dn & 1) \|\| pair == NULL)
	34	ide_acpi_set_state(hwif, 0);
	35	}
e2984c62 BZ	36
	37	return ret;
	38	}
	39
	40	int generic_ide_resume(struct device *dev)
	41	{
fcb52077 GKH	42	ide_drive_t *drive = dev_get_drvdata(dev);
fcb52077 GKH	43	ide_drive_t *pair = ide_get_pair_dev(drive);
898ec223	44	ide_hwif_t *hwif = drive->hwif;
e2984c62 BZ	45	struct request *rq;
e2984c62 BZ	46	struct request_pm_state rqpm;
e2984c62 BZ	47	int err;
e2984c62 BZ	48
2bf427b2 BZ	49	if (ide_port_acpi(hwif)) {
	50	/* call ACPI _PS0 / _STM only once */
	51	if ((drive->dn & 1) == 0 \|\| pair == NULL) {
	52	ide_acpi_set_state(hwif, 1);
	53	ide_acpi_push_timing(hwif);
	54	}
e2984c62	55
2bf427b2 BZ	56	ide_acpi_exec_tfs(drive);
2bf427b2 BZ	57	}
e2984c62 BZ	58
e2984c62 BZ	59	memset(&rqpm, 0, sizeof(rqpm));
e2984c62 BZ	60	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	61	rq->cmd_type = REQ_TYPE_PM_RESUME;
	62	rq->cmd_flags \|= REQ_PREEMPT;
fc38b521	63	rq->special = &rqpm;
e2984c62 BZ	64	rqpm.pm_step = IDE_PM_START_RESUME;
	65	rqpm.pm_state = PM_EVENT_ON;
	66
	67	err = blk_execute_rq(drive->queue, NULL, rq, 1);
	68	blk_put_request(rq);
	69
	70	if (err == 0 && dev->driver) {
7f3c868b	71	struct ide_driver *drv = to_ide_driver(dev->driver);
e2984c62 BZ	72
	73	if (drv->resume)
	74	drv->resume(drive);
	75	}
	76
	77	return err;
	78	}
	79
	80	void ide_complete_power_step(ide_drive_t drive, struct request rq)
	81	{
fc38b521	82	struct request_pm_state *pm = rq->special;
e2984c62 BZ	83
	84	#ifdef DEBUG_PM
	85	printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
	86	drive->name, pm->pm_step);
	87	#endif
	88	if (drive->media != ide_disk)
	89	return;
	90
	91	switch (pm->pm_step) {
	92	case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
	93	if (pm->pm_state == PM_EVENT_FREEZE)
	94	pm->pm_step = IDE_PM_COMPLETED;
	95	else
	96	pm->pm_step = IDE_PM_STANDBY;
	97	break;
	98	case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
	99	pm->pm_step = IDE_PM_COMPLETED;
	100	break;
	101	case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
	102	pm->pm_step = IDE_PM_IDLE;
	103	break;
	104	case IDE_PM_IDLE: /* Resume step 2 (idle)*/
	105	pm->pm_step = IDE_PM_RESTORE_DMA;
	106	break;
	107	}
	108	}
	109
	110	ide_startstop_t ide_start_power_step(ide_drive_t drive, struct request rq)
	111	{
fc38b521 TH	112	struct request_pm_state *pm = rq->special;
fc38b521 TH	113	struct ide_cmd cmd = { };
e2984c62 BZ	114
	115	switch (pm->pm_step) {
	116	case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
	117	if (drive->media != ide_disk)
	118	break;
	119	/* Not supported? Switch to next step now. */
	120	if (ata_id_flush_enabled(drive->id) == 0 \|\|
	121	(drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
	122	ide_complete_power_step(drive, rq);
	123	return ide_stopped;
	124	}
	125	if (ata_id_flush_ext_enabled(drive->id))
fc38b521	126	cmd.tf.command = ATA_CMD_FLUSH_EXT;
e2984c62	127	else
fc38b521	128	cmd.tf.command = ATA_CMD_FLUSH;
e2984c62 BZ	129	goto out_do_tf;
e2984c62 BZ	130	case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
fc38b521	131	cmd.tf.command = ATA_CMD_STANDBYNOW1;
e2984c62 BZ	132	goto out_do_tf;
	133	case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
	134	ide_set_max_pio(drive);
	135	/*
	136	* skip IDE_PM_IDLE for ATAPI devices
	137	*/
	138	if (drive->media != ide_disk)
	139	pm->pm_step = IDE_PM_RESTORE_DMA;
	140	else
	141	ide_complete_power_step(drive, rq);
	142	return ide_stopped;
	143	case IDE_PM_IDLE: /* Resume step 2 (idle) */
fc38b521	144	cmd.tf.command = ATA_CMD_IDLEIMMEDIATE;
e2984c62 BZ	145	goto out_do_tf;
	146	case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */
	147	/*
	148	* Right now, all we do is call ide_set_dma(drive),
	149	* we could be smarter and check for current xfer_speed
	150	* in struct drive etc...
	151	*/
	152	if (drive->hwif->dma_ops == NULL)
	153	break;
	154	/*
	155	* TODO: respect IDE_DFLAG_USING_DMA
	156	*/
	157	ide_set_dma(drive);
	158	break;
	159	}
	160
	161	pm->pm_step = IDE_PM_COMPLETED;
22aa4b32	162
e2984c62 BZ	163	return ide_stopped;
	164
	165	out_do_tf:
fc38b521 TH	166	cmd.valid.out.tf = IDE_VALID_OUT_TF \| IDE_VALID_DEVICE;
	167	cmd.valid.in.tf = IDE_VALID_IN_TF \| IDE_VALID_DEVICE;
	168	cmd.protocol = ATA_PROT_NODATA;
22aa4b32	169
fc38b521	170	return do_rw_taskfile(drive, &cmd);
e2984c62 BZ	171	}
	172
	173	/**
3616b653	174	* ide_complete_pm_rq - end the current Power Management request
e2984c62 BZ	175	* @drive: target drive
	176	* @rq: request
	177	*
	178	* This function cleans up the current PM request and stops the queue
	179	* if necessary.
	180	*/
3616b653	181	void ide_complete_pm_rq(ide_drive_t drive, struct request rq)
e2984c62 BZ	182	{
e2984c62 BZ	183	struct request_queue *q = drive->queue;
fc38b521	184	struct request_pm_state *pm = rq->special;
e2984c62 BZ	185	unsigned long flags;
e2984c62 BZ	186
3616b653 BZ	187	ide_complete_power_step(drive, rq);
	188	if (pm->pm_step != IDE_PM_COMPLETED)
	189	return;
	190
e2984c62 BZ	191	#ifdef DEBUG_PM
	192	printk("%s: completing PM request, %s\n", drive->name,
	193	blk_pm_suspend_request(rq) ? "suspend" : "resume");
	194	#endif
	195	spin_lock_irqsave(q->queue_lock, flags);
2ea55210	196	if (blk_pm_suspend_request(rq))
e2984c62	197	blk_stop_queue(q);
2ea55210	198	else
e2984c62	199	drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
e2984c62 BZ	200	spin_unlock_irqrestore(q->queue_lock, flags);
e2984c62 BZ	201
b65fac32	202	drive->hwif->rq = NULL;
e2984c62 BZ	203
	204	if (blk_end_request(rq, 0, 0))
	205	BUG();
	206	}
	207
	208	void ide_check_pm_state(ide_drive_t drive, struct request rq)
	209	{
fc38b521	210	struct request_pm_state *pm = rq->special;
e2984c62 BZ	211
	212	if (blk_pm_suspend_request(rq) &&
	213	pm->pm_step == IDE_PM_START_SUSPEND)
	214	/* Mark drive blocked when starting the suspend sequence. */
	215	drive->dev_flags \|= IDE_DFLAG_BLOCKED;
	216	else if (blk_pm_resume_request(rq) &&
	217	pm->pm_step == IDE_PM_START_RESUME) {
	218	/*
	219	* The first thing we do on wakeup is to wait for BSY bit to
	220	* go away (with a looong timeout) as a drive on this hwif may
	221	* just be POSTing itself.
	222	* We do that before even selecting as the "other" device on
	223	* the bus may be broken enough to walk on our toes at this
	224	* point.
	225	*/
	226	ide_hwif_t *hwif = drive->hwif;
fdd88f0a	227	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
2ea55210 BZ	228	struct request_queue *q = drive->queue;
2ea55210 BZ	229	unsigned long flags;
e2984c62 BZ	230	int rc;
	231	#ifdef DEBUG_PM
	232	printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
	233	#endif
	234	rc = ide_wait_not_busy(hwif, 35000);
	235	if (rc)
	236	printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
fdd88f0a SS	237	tp_ops->dev_select(drive);
fdd88f0a SS	238	tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
e2984c62 BZ	239	rc = ide_wait_not_busy(hwif, 100000);
	240	if (rc)
	241	printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
2ea55210 BZ	242
	243	spin_lock_irqsave(q->queue_lock, flags);
	244	blk_start_queue(q);
	245	spin_unlock_irqrestore(q->queue_lock, flags);
e2984c62 BZ	246	}
e2984c62 BZ	247	}