[GitHub/exynos8895/android_kernel_samsung_universal8895.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 = to_ide_device(dev);
	ide_drive_t *pair = ide_get_pair_dev(drive);
	ide_hwif_t *hwif = drive->hwif;
	struct request *rq;
	struct ide_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_RECLAIM);
	rq->cmd_type = REQ_TYPE_ATA_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;
}

static void ide_end_sync_rq(struct request *rq, int error)
{
	complete(rq->end_io_data);
}

static int ide_pm_execute_rq(struct request *rq)
{
	struct request_queue *q = rq->q;
	DECLARE_COMPLETION_ONSTACK(wait);

	rq->end_io_data = &wait;
	rq->end_io = ide_end_sync_rq;

	spin_lock_irq(q->queue_lock);
	if (unlikely(blk_queue_dying(q))) {
		rq->cmd_flags |= REQ_QUIET;
		rq->errors = -ENXIO;
		__blk_end_request_all(rq, rq->errors);
		spin_unlock_irq(q->queue_lock);
		return -ENXIO;
	}
	__elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
	__blk_run_queue_uncond(q);
	spin_unlock_irq(q->queue_lock);

	wait_for_completion_io(&wait);

	return rq->errors ? -EIO : 0;
}

int generic_ide_resume(struct device *dev)
{
	ide_drive_t *drive = to_ide_device(dev);
	ide_drive_t *pair = ide_get_pair_dev(drive);
	ide_hwif_t *hwif = drive->hwif;
	struct request *rq;
	struct ide_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_RECLAIM);
	rq->cmd_type = REQ_TYPE_ATA_PM_RESUME;
	rq->cmd_flags |= REQ_PREEMPT;
	rq->special = &rqpm;
	rqpm.pm_step = IDE_PM_START_RESUME;
	rqpm.pm_state = PM_EVENT_ON;

	err = ide_pm_execute_rq(rq);
	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 ide_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 ide_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 ide_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_ATA_PM_SUSPEND) ? "suspend" : "resume");
#endif
	spin_lock_irqsave(q->queue_lock, flags);
	if (rq->cmd_type == REQ_TYPE_ATA_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 ide_pm_state *pm = rq->special;

	if (rq->cmd_type == REQ_TYPE_ATA_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_ATA_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
	1	#include <linux/kernel.h>
	2	#include <linux/gfp.h>
	3	#include <linux/ide.h>
	4
	5	int generic_ide_suspend(struct device *dev, pm_message_t mesg)
	6	{
	7	ide_drive_t *drive = to_ide_device(dev);
	8	ide_drive_t *pair = ide_get_pair_dev(drive);
	9	ide_hwif_t *hwif = drive->hwif;
	10	struct request *rq;
	11	struct ide_pm_state rqpm;
	12	int ret;
	13
	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	}
	19
	20	memset(&rqpm, 0, sizeof(rqpm));
	21	rq = blk_get_request(drive->queue, READ, __GFP_RECLAIM);
	22	rq->cmd_type = REQ_TYPE_ATA_PM_SUSPEND;
	23	rq->special = &rqpm;
	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
	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	}
	37
	38	return ret;
	39	}
	40
	41	static void ide_end_sync_rq(struct request *rq, int error)
	42	{
	43	complete(rq->end_io_data);
	44	}
	45
	46	static int ide_pm_execute_rq(struct request *rq)
	47	{
	48	struct request_queue *q = rq->q;
	49	DECLARE_COMPLETION_ONSTACK(wait);
	50
	51	rq->end_io_data = &wait;
	52	rq->end_io = ide_end_sync_rq;
	53
	54	spin_lock_irq(q->queue_lock);
	55	if (unlikely(blk_queue_dying(q))) {
	56	rq->cmd_flags \|= REQ_QUIET;
	57	rq->errors = -ENXIO;
	58	__blk_end_request_all(rq, rq->errors);
	59	spin_unlock_irq(q->queue_lock);
	60	return -ENXIO;
	61	}
	62	__elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
	63	__blk_run_queue_uncond(q);
	64	spin_unlock_irq(q->queue_lock);
	65
	66	wait_for_completion_io(&wait);
	67
	68	return rq->errors ? -EIO : 0;
	69	}
	70
	71	int generic_ide_resume(struct device *dev)
	72	{
	73	ide_drive_t *drive = to_ide_device(dev);
	74	ide_drive_t *pair = ide_get_pair_dev(drive);
	75	ide_hwif_t *hwif = drive->hwif;
	76	struct request *rq;
	77	struct ide_pm_state rqpm;
	78	int err;
	79
	80	if (ide_port_acpi(hwif)) {
	81	/* call ACPI _PS0 / _STM only once */
	82	if ((drive->dn & 1) == 0 \|\| pair == NULL) {
	83	ide_acpi_set_state(hwif, 1);
	84	ide_acpi_push_timing(hwif);
	85	}
	86
	87	ide_acpi_exec_tfs(drive);
	88	}
	89
	90	memset(&rqpm, 0, sizeof(rqpm));
	91	rq = blk_get_request(drive->queue, READ, __GFP_RECLAIM);
	92	rq->cmd_type = REQ_TYPE_ATA_PM_RESUME;
	93	rq->cmd_flags \|= REQ_PREEMPT;
	94	rq->special = &rqpm;
	95	rqpm.pm_step = IDE_PM_START_RESUME;
	96	rqpm.pm_state = PM_EVENT_ON;
	97
	98	err = ide_pm_execute_rq(rq);
	99	blk_put_request(rq);
	100
	101	if (err == 0 && dev->driver) {
	102	struct ide_driver *drv = to_ide_driver(dev->driver);
	103
	104	if (drv->resume)
	105	drv->resume(drive);
	106	}
	107
	108	return err;
	109	}
	110
	111	void ide_complete_power_step(ide_drive_t drive, struct request rq)
	112	{
	113	struct ide_pm_state *pm = rq->special;
	114
	115	#ifdef DEBUG_PM
	116	printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
	117	drive->name, pm->pm_step);
	118	#endif
	119	if (drive->media != ide_disk)
	120	return;
	121
	122	switch (pm->pm_step) {
	123	case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
	124	if (pm->pm_state == PM_EVENT_FREEZE)
	125	pm->pm_step = IDE_PM_COMPLETED;
	126	else
	127	pm->pm_step = IDE_PM_STANDBY;
	128	break;
	129	case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
	130	pm->pm_step = IDE_PM_COMPLETED;
	131	break;
	132	case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
	133	pm->pm_step = IDE_PM_IDLE;
	134	break;
	135	case IDE_PM_IDLE: /* Resume step 2 (idle)*/
	136	pm->pm_step = IDE_PM_RESTORE_DMA;
	137	break;
	138	}
	139	}
	140
	141	ide_startstop_t ide_start_power_step(ide_drive_t drive, struct request rq)
	142	{
	143	struct ide_pm_state *pm = rq->special;
	144	struct ide_cmd cmd = { };
	145
	146	switch (pm->pm_step) {
	147	case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
	148	if (drive->media != ide_disk)
	149	break;
	150	/* Not supported? Switch to next step now. */
	151	if (ata_id_flush_enabled(drive->id) == 0 \|\|
	152	(drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
	153	ide_complete_power_step(drive, rq);
	154	return ide_stopped;
	155	}
	156	if (ata_id_flush_ext_enabled(drive->id))
	157	cmd.tf.command = ATA_CMD_FLUSH_EXT;
	158	else
	159	cmd.tf.command = ATA_CMD_FLUSH;
	160	goto out_do_tf;
	161	case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
	162	cmd.tf.command = ATA_CMD_STANDBYNOW1;
	163	goto out_do_tf;
	164	case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
	165	ide_set_max_pio(drive);
	166	/*
	167	* skip IDE_PM_IDLE for ATAPI devices
	168	*/
	169	if (drive->media != ide_disk)
	170	pm->pm_step = IDE_PM_RESTORE_DMA;
	171	else
	172	ide_complete_power_step(drive, rq);
	173	return ide_stopped;
	174	case IDE_PM_IDLE: /* Resume step 2 (idle) */
	175	cmd.tf.command = ATA_CMD_IDLEIMMEDIATE;
	176	goto out_do_tf;
	177	case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */
	178	/*
	179	* Right now, all we do is call ide_set_dma(drive),
	180	* we could be smarter and check for current xfer_speed
	181	* in struct drive etc...
	182	*/
	183	if (drive->hwif->dma_ops == NULL)
	184	break;
	185	/*
	186	* TODO: respect IDE_DFLAG_USING_DMA
	187	*/
	188	ide_set_dma(drive);
	189	break;
	190	}
	191
	192	pm->pm_step = IDE_PM_COMPLETED;
	193
	194	return ide_stopped;
	195
	196	out_do_tf:
	197	cmd.valid.out.tf = IDE_VALID_OUT_TF \| IDE_VALID_DEVICE;
	198	cmd.valid.in.tf = IDE_VALID_IN_TF \| IDE_VALID_DEVICE;
	199	cmd.protocol = ATA_PROT_NODATA;
	200
	201	return do_rw_taskfile(drive, &cmd);
	202	}
	203
	204	/**
	205	* ide_complete_pm_rq - end the current Power Management request
	206	* @drive: target drive
	207	* @rq: request
	208	*
	209	* This function cleans up the current PM request and stops the queue
	210	* if necessary.
	211	*/
	212	void ide_complete_pm_rq(ide_drive_t drive, struct request rq)
	213	{
	214	struct request_queue *q = drive->queue;
	215	struct ide_pm_state *pm = rq->special;
	216	unsigned long flags;
	217
	218	ide_complete_power_step(drive, rq);
	219	if (pm->pm_step != IDE_PM_COMPLETED)
	220	return;
	221
	222	#ifdef DEBUG_PM
	223	printk("%s: completing PM request, %s\n", drive->name,
	224	(rq->cmd_type == REQ_TYPE_ATA_PM_SUSPEND) ? "suspend" : "resume");
	225	#endif
	226	spin_lock_irqsave(q->queue_lock, flags);
	227	if (rq->cmd_type == REQ_TYPE_ATA_PM_SUSPEND)
	228	blk_stop_queue(q);
	229	else
	230	drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
	231	spin_unlock_irqrestore(q->queue_lock, flags);
	232
	233	drive->hwif->rq = NULL;
	234
	235	if (blk_end_request(rq, 0, 0))
	236	BUG();
	237	}
	238
	239	void ide_check_pm_state(ide_drive_t drive, struct request rq)
	240	{
	241	struct ide_pm_state *pm = rq->special;
	242
	243	if (rq->cmd_type == REQ_TYPE_ATA_PM_SUSPEND &&
	244	pm->pm_step == IDE_PM_START_SUSPEND)
	245	/* Mark drive blocked when starting the suspend sequence. */
	246	drive->dev_flags \|= IDE_DFLAG_BLOCKED;
	247	else if (rq->cmd_type == REQ_TYPE_ATA_PM_RESUME &&
	248	pm->pm_step == IDE_PM_START_RESUME) {
	249	/*
	250	* The first thing we do on wakeup is to wait for BSY bit to
	251	* go away (with a looong timeout) as a drive on this hwif may
	252	* just be POSTing itself.
	253	* We do that before even selecting as the "other" device on
	254	* the bus may be broken enough to walk on our toes at this
	255	* point.
	256	*/
	257	ide_hwif_t *hwif = drive->hwif;
	258	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
	259	struct request_queue *q = drive->queue;
	260	unsigned long flags;
	261	int rc;
	262	#ifdef DEBUG_PM
	263	printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
	264	#endif
	265	rc = ide_wait_not_busy(hwif, 35000);
	266	if (rc)
	267	printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
	268	tp_ops->dev_select(drive);
	269	tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
	270	rc = ide_wait_not_busy(hwif, 100000);
	271	if (rc)
	272	printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
	273
	274	spin_lock_irqsave(q->queue_lock, flags);
	275	blk_start_queue(q);
	276	spin_unlock_irqrestore(q->queue_lock, flags);
	277	}
	278	}