[linux-block.git] / drivers / ide / ide-park.c

#include <linux/kernel.h>
#include <linux/ide.h>
#include <linux/jiffies.h>
#include <linux/blkdev.h>

DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);

static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
{
	ide_hwif_t *hwif = drive->hwif;
	struct request_queue *q = drive->queue;
	struct request *rq;
	int rc;

	timeout += jiffies;
	spin_lock_irq(&hwif->lock);
	if (drive->dev_flags & IDE_DFLAG_PARKED) {
		int reset_timer = time_before(timeout, drive->sleep);
		int start_queue = 0;

		drive->sleep = timeout;
		wake_up_all(&ide_park_wq);
		if (reset_timer && del_timer(&hwif->timer))
			start_queue = 1;
		spin_unlock_irq(&hwif->lock);

		if (start_queue)
			blk_run_queue(q);
		return;
	}
	spin_unlock_irq(&hwif->lock);

	rq = blk_get_request(q, READ, __GFP_WAIT);
	rq->cmd[0] = REQ_PARK_HEADS;
	rq->cmd_len = 1;
	rq->cmd_type = REQ_TYPE_SPECIAL;
	rq->special = &timeout;
	rc = blk_execute_rq(q, NULL, rq, 1);
	blk_put_request(rq);
	if (rc)
		goto out;

	/*
	 * Make sure that *some* command is sent to the drive after the
	 * timeout has expired, so power management will be reenabled.
	 */
	rq = blk_get_request(q, READ, GFP_NOWAIT);
	if (unlikely(!rq))
		goto out;

	rq->cmd[0] = REQ_UNPARK_HEADS;
	rq->cmd_len = 1;
	rq->cmd_type = REQ_TYPE_SPECIAL;
	elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 1);

out:
	return;
}

ide_startstop_t ide_do_park_unpark(ide_drive_t *drive, struct request *rq)
{
	struct ide_cmd cmd;
	struct ide_taskfile *tf = &cmd.tf;

	memset(&cmd, 0, sizeof(cmd));
	if (rq->cmd[0] == REQ_PARK_HEADS) {
		drive->sleep = *(unsigned long *)rq->special;
		drive->dev_flags |= IDE_DFLAG_SLEEPING;
		tf->command = ATA_CMD_IDLEIMMEDIATE;
		tf->feature = 0x44;
		tf->lbal = 0x4c;
		tf->lbam = 0x4e;
		tf->lbah = 0x55;
		cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
		cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
	} else		/* cmd == REQ_UNPARK_HEADS */
		tf->command = ATA_CMD_CHK_POWER;

	cmd.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER;
	cmd.protocol = ATA_PROT_NODATA;

	cmd.rq = rq;

	return do_rw_taskfile(drive, &cmd);
}

ssize_t ide_park_show(struct device *dev, struct device_attribute *attr,
		      char *buf)
{
	ide_drive_t *drive = to_ide_device(dev);
	ide_hwif_t *hwif = drive->hwif;
	unsigned long now;
	unsigned int msecs;

	if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
		return -EOPNOTSUPP;

	spin_lock_irq(&hwif->lock);
	now = jiffies;
	if (drive->dev_flags & IDE_DFLAG_PARKED &&
	    time_after(drive->sleep, now))
		msecs = jiffies_to_msecs(drive->sleep - now);
	else
		msecs = 0;
	spin_unlock_irq(&hwif->lock);

	return snprintf(buf, 20, "%u\n", msecs);
}

ssize_t ide_park_store(struct device *dev, struct device_attribute *attr,
		       const char *buf, size_t len)
{
#define MAX_PARK_TIMEOUT 30000
	ide_drive_t *drive = to_ide_device(dev);
	long int input;
	int rc;

	rc = strict_strtol(buf, 10, &input);
	if (rc || input < -2)
		return -EINVAL;
	if (input > MAX_PARK_TIMEOUT) {
		input = MAX_PARK_TIMEOUT;
		rc = -EOVERFLOW;
	}

	mutex_lock(&ide_setting_mtx);
	if (input >= 0) {
		if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
			rc = -EOPNOTSUPP;
		else if (input || drive->dev_flags & IDE_DFLAG_PARKED)
			issue_park_cmd(drive, msecs_to_jiffies(input));
	} else {
		if (drive->media == ide_disk)
			switch (input) {
			case -1:
				drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
				break;
			case -2:
				drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
				break;
			}
		else
			rc = -EOPNOTSUPP;
	}
	mutex_unlock(&ide_setting_mtx);

	return rc ? rc : len;
}
Commit	Line	Data
4abdc6ee EO	1	#include <linux/kernel.h>
	2	#include <linux/ide.h>
	3	#include <linux/jiffies.h>
	4	#include <linux/blkdev.h>
	5
	6	DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);
	7
	8	static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
	9	{
b65fac32	10	ide_hwif_t *hwif = drive->hwif;
4abdc6ee EO	11	struct request_queue *q = drive->queue;
	12	struct request *rq;
	13	int rc;
	14
	15	timeout += jiffies;
b65fac32	16	spin_lock_irq(&hwif->lock);
4abdc6ee	17	if (drive->dev_flags & IDE_DFLAG_PARKED) {
2a2ca6a9	18	int reset_timer = time_before(timeout, drive->sleep);
201bffa4	19	int start_queue = 0;
4abdc6ee	20
4abdc6ee EO	21	drive->sleep = timeout;
4abdc6ee EO	22	wake_up_all(&ide_park_wq);
b65fac32	23	if (reset_timer && del_timer(&hwif->timer))
201bffa4	24	start_queue = 1;
b65fac32	25	spin_unlock_irq(&hwif->lock);
201bffa4	26
853280a4 TH	27	if (start_queue)
853280a4 TH	28	blk_run_queue(q);
4abdc6ee EO	29	return;
4abdc6ee EO	30	}
b65fac32	31	spin_unlock_irq(&hwif->lock);
4abdc6ee EO	32
	33	rq = blk_get_request(q, READ, __GFP_WAIT);
	34	rq->cmd[0] = REQ_PARK_HEADS;
	35	rq->cmd_len = 1;
	36	rq->cmd_type = REQ_TYPE_SPECIAL;
	37	rq->special = &timeout;
	38	rc = blk_execute_rq(q, NULL, rq, 1);
	39	blk_put_request(rq);
	40	if (rc)
	41	goto out;
	42
	43	/*
	44	* Make sure that some command is sent to the drive after the
	45	* timeout has expired, so power management will be reenabled.
	46	*/
	47	rq = blk_get_request(q, READ, GFP_NOWAIT);
	48	if (unlikely(!rq))
	49	goto out;
	50
	51	rq->cmd[0] = REQ_UNPARK_HEADS;
	52	rq->cmd_len = 1;
	53	rq->cmd_type = REQ_TYPE_SPECIAL;
	54	elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 1);
	55
	56	out:
	57	return;
	58	}
	59
c4e66c36 BZ	60	ide_startstop_t ide_do_park_unpark(ide_drive_t drive, struct request rq)
c4e66c36 BZ	61	{
22aa4b32 BZ	62	struct ide_cmd cmd;
22aa4b32 BZ	63	struct ide_taskfile *tf = &cmd.tf;
c4e66c36	64
22aa4b32	65	memset(&cmd, 0, sizeof(cmd));
c4e66c36 BZ	66	if (rq->cmd[0] == REQ_PARK_HEADS) {
	67	drive->sleep = (unsigned long )rq->special;
	68	drive->dev_flags \|= IDE_DFLAG_SLEEPING;
	69	tf->command = ATA_CMD_IDLEIMMEDIATE;
	70	tf->feature = 0x44;
	71	tf->lbal = 0x4c;
	72	tf->lbam = 0x4e;
	73	tf->lbah = 0x55;
60f85019 SS	74	cmd.valid.out.tf = IDE_VALID_OUT_TF \| IDE_VALID_DEVICE;
60f85019 SS	75	cmd.valid.in.tf = IDE_VALID_IN_TF \| IDE_VALID_DEVICE;
c4e66c36 BZ	76	} else /* cmd == REQ_UNPARK_HEADS */
	77	tf->command = ATA_CMD_CHK_POWER;
	78
d364c7f5	79	cmd.tf_flags \|= IDE_TFLAG_CUSTOM_HANDLER;
0dfb991c BZ	80	cmd.protocol = ATA_PROT_NODATA;
0dfb991c BZ	81
22aa4b32	82	cmd.rq = rq;
22aa4b32 BZ	83
22aa4b32 BZ	84	return do_rw_taskfile(drive, &cmd);
c4e66c36 BZ	85	}
c4e66c36 BZ	86
4abdc6ee EO	87	ssize_t ide_park_show(struct device dev, struct device_attribute attr,
	88	char *buf)
	89	{
	90	ide_drive_t *drive = to_ide_device(dev);
b65fac32	91	ide_hwif_t *hwif = drive->hwif;
4abdc6ee EO	92	unsigned long now;
	93	unsigned int msecs;
	94
	95	if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
	96	return -EOPNOTSUPP;
	97
b65fac32	98	spin_lock_irq(&hwif->lock);
4abdc6ee EO	99	now = jiffies;
	100	if (drive->dev_flags & IDE_DFLAG_PARKED &&
	101	time_after(drive->sleep, now))
	102	msecs = jiffies_to_msecs(drive->sleep - now);
	103	else
	104	msecs = 0;
b65fac32	105	spin_unlock_irq(&hwif->lock);
4abdc6ee EO	106
	107	return snprintf(buf, 20, "%u\n", msecs);
	108	}
	109
	110	ssize_t ide_park_store(struct device dev, struct device_attribute attr,
	111	const char *buf, size_t len)
	112	{
	113	#define MAX_PARK_TIMEOUT 30000
	114	ide_drive_t *drive = to_ide_device(dev);
	115	long int input;
	116	int rc;
	117
	118	rc = strict_strtol(buf, 10, &input);
	119	if (rc \|\| input < -2)
	120	return -EINVAL;
	121	if (input > MAX_PARK_TIMEOUT) {
	122	input = MAX_PARK_TIMEOUT;
	123	rc = -EOVERFLOW;
	124	}
	125
	126	mutex_lock(&ide_setting_mtx);
	127	if (input >= 0) {
	128	if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
	129	rc = -EOPNOTSUPP;
	130	else if (input \|\| drive->dev_flags & IDE_DFLAG_PARKED)
	131	issue_park_cmd(drive, msecs_to_jiffies(input));
	132	} else {
	133	if (drive->media == ide_disk)
	134	switch (input) {
	135	case -1:
	136	drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
	137	break;
	138	case -2:
	139	drive->dev_flags \|= IDE_DFLAG_NO_UNLOAD;
	140	break;
	141	}
	142	else
	143	rc = -EOPNOTSUPP;
	144	}
	145	mutex_unlock(&ide_setting_mtx);
	146
	147	return rc ? rc : len;
	148	}