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

#include <linux/kernel.h>
#include <linux/gfp.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,
	       (rq->cmd_type == REQ_TYPE_PM_SUSPEND) ? "suspend" : "resume");
#endif
	spin_lock_irqsave(q->queue_lock, flags);
	if (rq->cmd_type == REQ_TYPE_PM_SUSPEND)
		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 (rq->cmd_type == REQ_TYPE_PM_SUSPEND &&
	    pm->pm_step == IDE_PM_START_SUSPEND)
		/* Mark drive blocked when starting the suspend sequence. */
		drive->dev_flags |= IDE_DFLAG_BLOCKED;
	else if (rq->cmd_type == REQ_TYPE_PM_RESUME &&
		 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	1	#include <linux/kernel.h>
5a0e3ad6	2	#include <linux/gfp.h>
e2984c62	3	#include <linux/ide.h>
e2984c62 BZ	4
	5	int generic_ide_suspend(struct device *dev, pm_message_t mesg)
	6	{
fcb52077 GKH	7	ide_drive_t *drive = dev_get_drvdata(dev);
fcb52077 GKH	8	ide_drive_t *pair = ide_get_pair_dev(drive);
898ec223	9	ide_hwif_t *hwif = drive->hwif;
e2984c62 BZ	10	struct request *rq;
e2984c62 BZ	11	struct request_pm_state rqpm;
e2984c62 BZ	12	int ret;
e2984c62 BZ	13
2bf427b2 BZ	14	if (ide_port_acpi(hwif)) {
	15	/* call ACPI _GTM only once */
	16	if ((drive->dn & 1) == 0 \|\| pair == NULL)
	17	ide_acpi_get_timing(hwif);
	18	}
e2984c62 BZ	19
e2984c62 BZ	20	memset(&rqpm, 0, sizeof(rqpm));
e2984c62 BZ	21	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
e2984c62 BZ	22	rq->cmd_type = REQ_TYPE_PM_SUSPEND;
fc38b521	23	rq->special = &rqpm;
e2984c62 BZ	24	rqpm.pm_step = IDE_PM_START_SUSPEND;
	25	if (mesg.event == PM_EVENT_PRETHAW)
	26	mesg.event = PM_EVENT_FREEZE;
	27	rqpm.pm_state = mesg.event;
	28
	29	ret = blk_execute_rq(drive->queue, NULL, rq, 0);
	30	blk_put_request(rq);
	31
2bf427b2 BZ	32	if (ret == 0 && ide_port_acpi(hwif)) {
	33	/* call ACPI _PS3 only after both devices are suspended */
	34	if ((drive->dn & 1) \|\| pair == NULL)
	35	ide_acpi_set_state(hwif, 0);
	36	}
e2984c62 BZ	37
	38	return ret;
	39	}
	40
	41	int generic_ide_resume(struct device *dev)
	42	{
fcb52077 GKH	43	ide_drive_t *drive = dev_get_drvdata(dev);
fcb52077 GKH	44	ide_drive_t *pair = ide_get_pair_dev(drive);
898ec223	45	ide_hwif_t *hwif = drive->hwif;
e2984c62 BZ	46	struct request *rq;
e2984c62 BZ	47	struct request_pm_state rqpm;
e2984c62 BZ	48	int err;
e2984c62 BZ	49
2bf427b2 BZ	50	if (ide_port_acpi(hwif)) {
	51	/* call ACPI _PS0 / _STM only once */
	52	if ((drive->dn & 1) == 0 \|\| pair == NULL) {
	53	ide_acpi_set_state(hwif, 1);
	54	ide_acpi_push_timing(hwif);
	55	}
e2984c62	56
2bf427b2 BZ	57	ide_acpi_exec_tfs(drive);
2bf427b2 BZ	58	}
e2984c62 BZ	59
e2984c62 BZ	60	memset(&rqpm, 0, sizeof(rqpm));
e2984c62 BZ	61	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	62	rq->cmd_type = REQ_TYPE_PM_RESUME;
	63	rq->cmd_flags \|= REQ_PREEMPT;
fc38b521	64	rq->special = &rqpm;
e2984c62 BZ	65	rqpm.pm_step = IDE_PM_START_RESUME;
	66	rqpm.pm_state = PM_EVENT_ON;
	67
	68	err = blk_execute_rq(drive->queue, NULL, rq, 1);
	69	blk_put_request(rq);
	70
	71	if (err == 0 && dev->driver) {
7f3c868b	72	struct ide_driver *drv = to_ide_driver(dev->driver);
e2984c62 BZ	73
	74	if (drv->resume)
	75	drv->resume(drive);
	76	}
	77
	78	return err;
	79	}
	80
	81	void ide_complete_power_step(ide_drive_t drive, struct request rq)
	82	{
fc38b521	83	struct request_pm_state *pm = rq->special;
e2984c62 BZ	84
	85	#ifdef DEBUG_PM
	86	printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
	87	drive->name, pm->pm_step);
	88	#endif
	89	if (drive->media != ide_disk)
	90	return;
	91
	92	switch (pm->pm_step) {
	93	case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
	94	if (pm->pm_state == PM_EVENT_FREEZE)
	95	pm->pm_step = IDE_PM_COMPLETED;
	96	else
	97	pm->pm_step = IDE_PM_STANDBY;
	98	break;
	99	case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
	100	pm->pm_step = IDE_PM_COMPLETED;
	101	break;
	102	case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
	103	pm->pm_step = IDE_PM_IDLE;
	104	break;
	105	case IDE_PM_IDLE: /* Resume step 2 (idle)*/
	106	pm->pm_step = IDE_PM_RESTORE_DMA;
	107	break;
	108	}
	109	}
	110
	111	ide_startstop_t ide_start_power_step(ide_drive_t drive, struct request rq)
	112	{
fc38b521 TH	113	struct request_pm_state *pm = rq->special;
fc38b521 TH	114	struct ide_cmd cmd = { };
e2984c62 BZ	115
	116	switch (pm->pm_step) {
	117	case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
	118	if (drive->media != ide_disk)
	119	break;
	120	/* Not supported? Switch to next step now. */
	121	if (ata_id_flush_enabled(drive->id) == 0 \|\|
	122	(drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
	123	ide_complete_power_step(drive, rq);
	124	return ide_stopped;
	125	}
	126	if (ata_id_flush_ext_enabled(drive->id))
fc38b521	127	cmd.tf.command = ATA_CMD_FLUSH_EXT;
e2984c62	128	else
fc38b521	129	cmd.tf.command = ATA_CMD_FLUSH;
e2984c62 BZ	130	goto out_do_tf;
e2984c62 BZ	131	case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
fc38b521	132	cmd.tf.command = ATA_CMD_STANDBYNOW1;
e2984c62 BZ	133	goto out_do_tf;
	134	case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
	135	ide_set_max_pio(drive);
	136	/*
	137	* skip IDE_PM_IDLE for ATAPI devices
	138	*/
	139	if (drive->media != ide_disk)
	140	pm->pm_step = IDE_PM_RESTORE_DMA;
	141	else
	142	ide_complete_power_step(drive, rq);
	143	return ide_stopped;
	144	case IDE_PM_IDLE: /* Resume step 2 (idle) */
fc38b521	145	cmd.tf.command = ATA_CMD_IDLEIMMEDIATE;
e2984c62 BZ	146	goto out_do_tf;
	147	case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */
	148	/*
	149	* Right now, all we do is call ide_set_dma(drive),
	150	* we could be smarter and check for current xfer_speed
	151	* in struct drive etc...
	152	*/
	153	if (drive->hwif->dma_ops == NULL)
	154	break;
	155	/*
	156	* TODO: respect IDE_DFLAG_USING_DMA
	157	*/
	158	ide_set_dma(drive);
	159	break;
	160	}
	161
	162	pm->pm_step = IDE_PM_COMPLETED;
22aa4b32	163
e2984c62 BZ	164	return ide_stopped;
	165
	166	out_do_tf:
fc38b521 TH	167	cmd.valid.out.tf = IDE_VALID_OUT_TF \| IDE_VALID_DEVICE;
	168	cmd.valid.in.tf = IDE_VALID_IN_TF \| IDE_VALID_DEVICE;
	169	cmd.protocol = ATA_PROT_NODATA;
22aa4b32	170
fc38b521	171	return do_rw_taskfile(drive, &cmd);
e2984c62 BZ	172	}
	173
	174	/**
3616b653	175	* ide_complete_pm_rq - end the current Power Management request
e2984c62 BZ	176	* @drive: target drive
	177	* @rq: request
	178	*
	179	* This function cleans up the current PM request and stops the queue
	180	* if necessary.
	181	*/
3616b653	182	void ide_complete_pm_rq(ide_drive_t drive, struct request rq)
e2984c62 BZ	183	{
e2984c62 BZ	184	struct request_queue *q = drive->queue;
fc38b521	185	struct request_pm_state *pm = rq->special;
e2984c62 BZ	186	unsigned long flags;
e2984c62 BZ	187
3616b653 BZ	188	ide_complete_power_step(drive, rq);
	189	if (pm->pm_step != IDE_PM_COMPLETED)
	190	return;
	191
e2984c62 BZ	192	#ifdef DEBUG_PM
e2984c62 BZ	193	printk("%s: completing PM request, %s\n", drive->name,
33659ebb	194	(rq->cmd_type == REQ_TYPE_PM_SUSPEND) ? "suspend" : "resume");
e2984c62 BZ	195	#endif
e2984c62 BZ	196	spin_lock_irqsave(q->queue_lock, flags);
33659ebb	197	if (rq->cmd_type == REQ_TYPE_PM_SUSPEND)
e2984c62	198	blk_stop_queue(q);
2ea55210	199	else
e2984c62	200	drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
e2984c62 BZ	201	spin_unlock_irqrestore(q->queue_lock, flags);
e2984c62 BZ	202
b65fac32	203	drive->hwif->rq = NULL;
e2984c62 BZ	204
	205	if (blk_end_request(rq, 0, 0))
	206	BUG();
	207	}
	208
	209	void ide_check_pm_state(ide_drive_t drive, struct request rq)
	210	{
fc38b521	211	struct request_pm_state *pm = rq->special;
e2984c62	212
33659ebb	213	if (rq->cmd_type == REQ_TYPE_PM_SUSPEND &&
e2984c62 BZ	214	pm->pm_step == IDE_PM_START_SUSPEND)
	215	/* Mark drive blocked when starting the suspend sequence. */
	216	drive->dev_flags \|= IDE_DFLAG_BLOCKED;
33659ebb	217	else if (rq->cmd_type == REQ_TYPE_PM_RESUME &&
e2984c62 BZ	218	pm->pm_step == IDE_PM_START_RESUME) {
	219	/*
	220	* The first thing we do on wakeup is to wait for BSY bit to
	221	* go away (with a looong timeout) as a drive on this hwif may
	222	* just be POSTing itself.
	223	* We do that before even selecting as the "other" device on
	224	* the bus may be broken enough to walk on our toes at this
	225	* point.
	226	*/
	227	ide_hwif_t *hwif = drive->hwif;
fdd88f0a	228	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
2ea55210 BZ	229	struct request_queue *q = drive->queue;
2ea55210 BZ	230	unsigned long flags;
e2984c62 BZ	231	int rc;
	232	#ifdef DEBUG_PM
	233	printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
	234	#endif
	235	rc = ide_wait_not_busy(hwif, 35000);
	236	if (rc)
	237	printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
fdd88f0a SS	238	tp_ops->dev_select(drive);
fdd88f0a SS	239	tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
e2984c62 BZ	240	rc = ide_wait_not_busy(hwif, 100000);
	241	if (rc)
	242	printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
2ea55210 BZ	243
	244	spin_lock_irqsave(q->queue_lock, flags);
	245	blk_start_queue(q);
	246	spin_unlock_irqrestore(q->queue_lock, flags);
e2984c62 BZ	247	}
e2984c62 BZ	248	}