[deliverable/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;

	/* 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);

	/* call ACPI _PS3 only after both devices are suspended */
	if (ret == 0 && ((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;

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