[net-next-2.6.git] / drivers / ide / ide-park.c

#include <linux/kernel.h>
#include <linux/gfp.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	1	#include <linux/kernel.h>
5a0e3ad6	2	#include <linux/gfp.h>
4abdc6ee EO	3	#include <linux/ide.h>
	4	#include <linux/jiffies.h>
	5	#include <linux/blkdev.h>
	6
	7	DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);
	8
	9	static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
	10	{
b65fac32	11	ide_hwif_t *hwif = drive->hwif;
4abdc6ee EO	12	struct request_queue *q = drive->queue;
	13	struct request *rq;
	14	int rc;
	15
	16	timeout += jiffies;
b65fac32	17	spin_lock_irq(&hwif->lock);
4abdc6ee	18	if (drive->dev_flags & IDE_DFLAG_PARKED) {
2a2ca6a9	19	int reset_timer = time_before(timeout, drive->sleep);
201bffa4	20	int start_queue = 0;
4abdc6ee	21
4abdc6ee EO	22	drive->sleep = timeout;
4abdc6ee EO	23	wake_up_all(&ide_park_wq);
b65fac32	24	if (reset_timer && del_timer(&hwif->timer))
201bffa4	25	start_queue = 1;
b65fac32	26	spin_unlock_irq(&hwif->lock);
201bffa4	27
853280a4 TH	28	if (start_queue)
853280a4 TH	29	blk_run_queue(q);
4abdc6ee EO	30	return;
4abdc6ee EO	31	}
b65fac32	32	spin_unlock_irq(&hwif->lock);
4abdc6ee EO	33
	34	rq = blk_get_request(q, READ, __GFP_WAIT);
	35	rq->cmd[0] = REQ_PARK_HEADS;
	36	rq->cmd_len = 1;
	37	rq->cmd_type = REQ_TYPE_SPECIAL;
	38	rq->special = &timeout;
	39	rc = blk_execute_rq(q, NULL, rq, 1);
	40	blk_put_request(rq);
	41	if (rc)
	42	goto out;
	43
	44	/*
	45	* Make sure that some command is sent to the drive after the
	46	* timeout has expired, so power management will be reenabled.
	47	*/
	48	rq = blk_get_request(q, READ, GFP_NOWAIT);
	49	if (unlikely(!rq))
	50	goto out;
	51
	52	rq->cmd[0] = REQ_UNPARK_HEADS;
	53	rq->cmd_len = 1;
	54	rq->cmd_type = REQ_TYPE_SPECIAL;
	55	elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 1);
	56
	57	out:
	58	return;
	59	}
	60
c4e66c36 BZ	61	ide_startstop_t ide_do_park_unpark(ide_drive_t drive, struct request rq)
c4e66c36 BZ	62	{
22aa4b32 BZ	63	struct ide_cmd cmd;
22aa4b32 BZ	64	struct ide_taskfile *tf = &cmd.tf;
c4e66c36	65
22aa4b32	66	memset(&cmd, 0, sizeof(cmd));
c4e66c36 BZ	67	if (rq->cmd[0] == REQ_PARK_HEADS) {
	68	drive->sleep = (unsigned long )rq->special;
	69	drive->dev_flags \|= IDE_DFLAG_SLEEPING;
	70	tf->command = ATA_CMD_IDLEIMMEDIATE;
	71	tf->feature = 0x44;
	72	tf->lbal = 0x4c;
	73	tf->lbam = 0x4e;
	74	tf->lbah = 0x55;
60f85019 SS	75	cmd.valid.out.tf = IDE_VALID_OUT_TF \| IDE_VALID_DEVICE;
60f85019 SS	76	cmd.valid.in.tf = IDE_VALID_IN_TF \| IDE_VALID_DEVICE;
c4e66c36 BZ	77	} else /* cmd == REQ_UNPARK_HEADS */
	78	tf->command = ATA_CMD_CHK_POWER;
	79
d364c7f5	80	cmd.tf_flags \|= IDE_TFLAG_CUSTOM_HANDLER;
0dfb991c BZ	81	cmd.protocol = ATA_PROT_NODATA;
0dfb991c BZ	82
22aa4b32	83	cmd.rq = rq;
22aa4b32 BZ	84
22aa4b32 BZ	85	return do_rw_taskfile(drive, &cmd);
c4e66c36 BZ	86	}
c4e66c36 BZ	87
4abdc6ee EO	88	ssize_t ide_park_show(struct device dev, struct device_attribute attr,
	89	char *buf)
	90	{
	91	ide_drive_t *drive = to_ide_device(dev);
b65fac32	92	ide_hwif_t *hwif = drive->hwif;
4abdc6ee EO	93	unsigned long now;
	94	unsigned int msecs;
	95
	96	if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
	97	return -EOPNOTSUPP;
	98
b65fac32	99	spin_lock_irq(&hwif->lock);
4abdc6ee EO	100	now = jiffies;
	101	if (drive->dev_flags & IDE_DFLAG_PARKED &&
	102	time_after(drive->sleep, now))
	103	msecs = jiffies_to_msecs(drive->sleep - now);
	104	else
	105	msecs = 0;
b65fac32	106	spin_unlock_irq(&hwif->lock);
4abdc6ee EO	107
	108	return snprintf(buf, 20, "%u\n", msecs);
	109	}
	110
	111	ssize_t ide_park_store(struct device dev, struct device_attribute attr,
	112	const char *buf, size_t len)
	113	{
	114	#define MAX_PARK_TIMEOUT 30000
	115	ide_drive_t *drive = to_ide_device(dev);
	116	long int input;
	117	int rc;
	118
	119	rc = strict_strtol(buf, 10, &input);
	120	if (rc \|\| input < -2)
	121	return -EINVAL;
	122	if (input > MAX_PARK_TIMEOUT) {
	123	input = MAX_PARK_TIMEOUT;
	124	rc = -EOVERFLOW;
	125	}
	126
	127	mutex_lock(&ide_setting_mtx);
	128	if (input >= 0) {
	129	if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
	130	rc = -EOPNOTSUPP;
	131	else if (input \|\| drive->dev_flags & IDE_DFLAG_PARKED)
	132	issue_park_cmd(drive, msecs_to_jiffies(input));
	133	} else {
	134	if (drive->media == ide_disk)
	135	switch (input) {
	136	case -1:
	137	drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
	138	break;
	139	case -2:
	140	drive->dev_flags \|= IDE_DFLAG_NO_UNLOAD;
	141	break;
	142	}
	143	else
	144	rc = -EOPNOTSUPP;
	145	}
	146	mutex_unlock(&ide_setting_mtx);
	147
	148	return rc ? rc : len;
	149	}