[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->driver_data, *pair = ide_get_pair_dev(drive);
	ide_hwif_t *hwif = drive->hwif;
	struct request *rq;
	struct request_pm_state rqpm;
	struct ide_cmd cmd;
	int ret;

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

	memset(&rqpm, 0, sizeof(rqpm));
	memset(&cmd, 0, sizeof(cmd));
	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	rq->cmd_type = REQ_TYPE_PM_SUSPEND;
	rq->special = &cmd;
	rq->data = &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;
	struct ide_cmd cmd;
	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));
	memset(&cmd, 0, sizeof(cmd));
	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	rq->cmd_type = REQ_TYPE_PM_RESUME;
	rq->cmd_flags |= REQ_PREEMPT;
	rq->special = &cmd;
	rq->data = &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->data;

#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->data;
	struct ide_cmd *cmd = rq->special;

	memset(cmd, 0, sizeof(*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->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_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->data;
	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->data;

	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;
22aa4b32	10	struct ide_cmd cmd;
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));
22aa4b32	18	memset(&cmd, 0, sizeof(cmd));
e2984c62 BZ	19	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
e2984c62 BZ	20	rq->cmd_type = REQ_TYPE_PM_SUSPEND;
22aa4b32	21	rq->special = &cmd;
e2984c62 BZ	22	rq->data = &rqpm;
	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
	31	/* call ACPI _PS3 only after both devices are suspended */
	32	if (ret == 0 && ((drive->dn & 1) \|\| pair == NULL))
	33	ide_acpi_set_state(hwif, 0);
	34
	35	return ret;
	36	}
	37
	38	int generic_ide_resume(struct device *dev)
	39	{
	40	ide_drive_t drive = dev->driver_data, pair = ide_get_pair_dev(drive);
898ec223	41	ide_hwif_t *hwif = drive->hwif;
e2984c62 BZ	42	struct request *rq;
e2984c62 BZ	43	struct request_pm_state rqpm;
22aa4b32	44	struct ide_cmd cmd;
e2984c62 BZ	45	int err;
	46
	47	/* call ACPI _PS0 / _STM only once */
	48	if ((drive->dn & 1) == 0 \|\| pair == NULL) {
	49	ide_acpi_set_state(hwif, 1);
	50	ide_acpi_push_timing(hwif);
	51	}
	52
	53	ide_acpi_exec_tfs(drive);
	54
	55	memset(&rqpm, 0, sizeof(rqpm));
22aa4b32	56	memset(&cmd, 0, sizeof(cmd));
e2984c62 BZ	57	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	58	rq->cmd_type = REQ_TYPE_PM_RESUME;
	59	rq->cmd_flags \|= REQ_PREEMPT;
22aa4b32	60	rq->special = &cmd;
e2984c62 BZ	61	rq->data = &rqpm;
	62	rqpm.pm_step = IDE_PM_START_RESUME;
	63	rqpm.pm_state = PM_EVENT_ON;
	64
	65	err = blk_execute_rq(drive->queue, NULL, rq, 1);
	66	blk_put_request(rq);
	67
	68	if (err == 0 && dev->driver) {
7f3c868b	69	struct ide_driver *drv = to_ide_driver(dev->driver);
e2984c62 BZ	70
	71	if (drv->resume)
	72	drv->resume(drive);
	73	}
	74
	75	return err;
	76	}
	77
	78	void ide_complete_power_step(ide_drive_t drive, struct request rq)
	79	{
	80	struct request_pm_state *pm = rq->data;
	81
	82	#ifdef DEBUG_PM
	83	printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
	84	drive->name, pm->pm_step);
	85	#endif
	86	if (drive->media != ide_disk)
	87	return;
	88
	89	switch (pm->pm_step) {
	90	case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
	91	if (pm->pm_state == PM_EVENT_FREEZE)
	92	pm->pm_step = IDE_PM_COMPLETED;
	93	else
	94	pm->pm_step = IDE_PM_STANDBY;
	95	break;
	96	case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
	97	pm->pm_step = IDE_PM_COMPLETED;
	98	break;
	99	case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
	100	pm->pm_step = IDE_PM_IDLE;
	101	break;
	102	case IDE_PM_IDLE: /* Resume step 2 (idle)*/
	103	pm->pm_step = IDE_PM_RESTORE_DMA;
	104	break;
	105	}
	106	}
	107
	108	ide_startstop_t ide_start_power_step(ide_drive_t drive, struct request rq)
	109	{
	110	struct request_pm_state *pm = rq->data;
22aa4b32	111	struct ide_cmd *cmd = rq->special;
e2984c62	112
22aa4b32	113	memset(cmd, 0, sizeof(*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))
22aa4b32	126	cmd->tf.command = ATA_CMD_FLUSH_EXT;
e2984c62	127	else
22aa4b32	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) */
22aa4b32	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) */
22aa4b32	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:
0dfb991c BZ	166	cmd->tf_flags = IDE_TFLAG_TF \| IDE_TFLAG_DEVICE;
0dfb991c BZ	167	cmd->protocol = ATA_PROT_NODATA;
22aa4b32 BZ	168
22aa4b32 BZ	169	return do_rw_taskfile(drive, cmd);
e2984c62 BZ	170	}
	171
	172	/**
3616b653	173	* ide_complete_pm_rq - end the current Power Management request
e2984c62 BZ	174	* @drive: target drive
	175	* @rq: request
	176	*
	177	* This function cleans up the current PM request and stops the queue
	178	* if necessary.
	179	*/
3616b653	180	void ide_complete_pm_rq(ide_drive_t drive, struct request rq)
e2984c62 BZ	181	{
e2984c62 BZ	182	struct request_queue *q = drive->queue;
3616b653	183	struct request_pm_state *pm = rq->data;
e2984c62 BZ	184	unsigned long flags;
e2984c62 BZ	185
3616b653 BZ	186	ide_complete_power_step(drive, rq);
	187	if (pm->pm_step != IDE_PM_COMPLETED)
	188	return;
	189
e2984c62 BZ	190	#ifdef DEBUG_PM
	191	printk("%s: completing PM request, %s\n", drive->name,
	192	blk_pm_suspend_request(rq) ? "suspend" : "resume");
	193	#endif
	194	spin_lock_irqsave(q->queue_lock, flags);
2ea55210	195	if (blk_pm_suspend_request(rq))
e2984c62	196	blk_stop_queue(q);
2ea55210	197	else
e2984c62	198	drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
e2984c62 BZ	199	spin_unlock_irqrestore(q->queue_lock, flags);
e2984c62 BZ	200
b65fac32	201	drive->hwif->rq = NULL;
e2984c62 BZ	202
	203	if (blk_end_request(rq, 0, 0))
	204	BUG();
	205	}
	206
	207	void ide_check_pm_state(ide_drive_t drive, struct request rq)
	208	{
	209	struct request_pm_state *pm = rq->data;
	210
	211	if (blk_pm_suspend_request(rq) &&
	212	pm->pm_step == IDE_PM_START_SUSPEND)
	213	/* Mark drive blocked when starting the suspend sequence. */
	214	drive->dev_flags \|= IDE_DFLAG_BLOCKED;
	215	else if (blk_pm_resume_request(rq) &&
	216	pm->pm_step == IDE_PM_START_RESUME) {
	217	/*
	218	* The first thing we do on wakeup is to wait for BSY bit to
	219	* go away (with a looong timeout) as a drive on this hwif may
	220	* just be POSTing itself.
	221	* We do that before even selecting as the "other" device on
	222	* the bus may be broken enough to walk on our toes at this
	223	* point.
	224	*/
	225	ide_hwif_t *hwif = drive->hwif;
fdd88f0a	226	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
2ea55210 BZ	227	struct request_queue *q = drive->queue;
2ea55210 BZ	228	unsigned long flags;
e2984c62 BZ	229	int rc;
	230	#ifdef DEBUG_PM
	231	printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
	232	#endif
	233	rc = ide_wait_not_busy(hwif, 35000);
	234	if (rc)
	235	printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
fdd88f0a SS	236	tp_ops->dev_select(drive);
fdd88f0a SS	237	tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
e2984c62 BZ	238	rc = ide_wait_not_busy(hwif, 100000);
	239	if (rc)
	240	printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
2ea55210 BZ	241
	242	spin_lock_irqsave(q->queue_lock, flags);
	243	blk_start_queue(q);
	244	spin_unlock_irqrestore(q->queue_lock, flags);
e2984c62 BZ	245	}
e2984c62 BZ	246	}