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