1 #include <linux/kernel.h>
4 #include <linux/jiffies.h>
5 #include <linux/blkdev.h>
7 DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);
9 static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
11 ide_hwif_t *hwif = drive->hwif;
12 struct request_queue *q = drive->queue;
17 spin_lock_irq(&hwif->lock);
18 if (drive->dev_flags & IDE_DFLAG_PARKED) {
19 int reset_timer = time_before(timeout, drive->sleep);
22 drive->sleep = timeout;
23 wake_up_all(&ide_park_wq);
24 if (reset_timer && del_timer(&hwif->timer))
26 spin_unlock_irq(&hwif->lock);
32 spin_unlock_irq(&hwif->lock);
34 rq = blk_get_request(q, REQ_OP_DRV_IN, __GFP_RECLAIM);
35 scsi_req(rq)->cmd[0] = REQ_PARK_HEADS;
36 scsi_req(rq)->cmd_len = 1;
37 ide_req(rq)->type = ATA_PRIV_MISC;
38 rq->special = &timeout;
39 blk_execute_rq(q, NULL, rq, 1);
40 rc = scsi_req(rq)->result ? -EIO : 0;
46 * Make sure that *some* command is sent to the drive after the
47 * timeout has expired, so power management will be reenabled.
49 rq = blk_get_request(q, REQ_OP_DRV_IN, GFP_NOWAIT);
53 scsi_req(rq)->cmd[0] = REQ_UNPARK_HEADS;
54 scsi_req(rq)->cmd_len = 1;
55 ide_req(rq)->type = ATA_PRIV_MISC;
56 elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
62 ide_startstop_t ide_do_park_unpark(ide_drive_t *drive, struct request *rq)
65 struct ide_taskfile *tf = &cmd.tf;
67 memset(&cmd, 0, sizeof(cmd));
68 if (scsi_req(rq)->cmd[0] == REQ_PARK_HEADS) {
69 drive->sleep = *(unsigned long *)rq->special;
70 drive->dev_flags |= IDE_DFLAG_SLEEPING;
71 tf->command = ATA_CMD_IDLEIMMEDIATE;
76 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
77 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
78 } else /* cmd == REQ_UNPARK_HEADS */
79 tf->command = ATA_CMD_CHK_POWER;
81 cmd.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER;
82 cmd.protocol = ATA_PROT_NODATA;
86 return do_rw_taskfile(drive, &cmd);
89 ssize_t ide_park_show(struct device *dev, struct device_attribute *attr,
92 ide_drive_t *drive = to_ide_device(dev);
93 ide_hwif_t *hwif = drive->hwif;
97 if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
100 spin_lock_irq(&hwif->lock);
102 if (drive->dev_flags & IDE_DFLAG_PARKED &&
103 time_after(drive->sleep, now))
104 msecs = jiffies_to_msecs(drive->sleep - now);
107 spin_unlock_irq(&hwif->lock);
109 return snprintf(buf, 20, "%u\n", msecs);
112 ssize_t ide_park_store(struct device *dev, struct device_attribute *attr,
113 const char *buf, size_t len)
115 #define MAX_PARK_TIMEOUT 30000
116 ide_drive_t *drive = to_ide_device(dev);
120 rc = kstrtol(buf, 10, &input);
125 if (input > MAX_PARK_TIMEOUT) {
126 input = MAX_PARK_TIMEOUT;
130 mutex_lock(&ide_setting_mtx);
132 if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
134 else if (input || drive->dev_flags & IDE_DFLAG_PARKED)
135 issue_park_cmd(drive, msecs_to_jiffies(input));
137 if (drive->media == ide_disk)
140 drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
143 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
149 mutex_unlock(&ide_setting_mtx);
151 return rc ? rc : len;