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);
36 scsi_req(rq)->cmd[0] = REQ_PARK_HEADS;
37 scsi_req(rq)->cmd_len = 1;
38 ide_req(rq)->type = ATA_PRIV_MISC;
39 rq->special = &timeout;
40 blk_execute_rq(q, NULL, rq, 1);
41 rc = scsi_req(rq)->result ? -EIO : 0;
47 * Make sure that *some* command is sent to the drive after the
48 * timeout has expired, so power management will be reenabled.
50 rq = blk_get_request(q, REQ_OP_DRV_IN, GFP_NOWAIT);
55 scsi_req(rq)->cmd[0] = REQ_UNPARK_HEADS;
56 scsi_req(rq)->cmd_len = 1;
57 ide_req(rq)->type = ATA_PRIV_MISC;
58 elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
64 ide_startstop_t ide_do_park_unpark(ide_drive_t *drive, struct request *rq)
67 struct ide_taskfile *tf = &cmd.tf;
69 memset(&cmd, 0, sizeof(cmd));
70 if (scsi_req(rq)->cmd[0] == REQ_PARK_HEADS) {
71 drive->sleep = *(unsigned long *)rq->special;
72 drive->dev_flags |= IDE_DFLAG_SLEEPING;
73 tf->command = ATA_CMD_IDLEIMMEDIATE;
78 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
79 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
80 } else /* cmd == REQ_UNPARK_HEADS */
81 tf->command = ATA_CMD_CHK_POWER;
83 cmd.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER;
84 cmd.protocol = ATA_PROT_NODATA;
88 return do_rw_taskfile(drive, &cmd);
91 ssize_t ide_park_show(struct device *dev, struct device_attribute *attr,
94 ide_drive_t *drive = to_ide_device(dev);
95 ide_hwif_t *hwif = drive->hwif;
99 if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
102 spin_lock_irq(&hwif->lock);
104 if (drive->dev_flags & IDE_DFLAG_PARKED &&
105 time_after(drive->sleep, now))
106 msecs = jiffies_to_msecs(drive->sleep - now);
109 spin_unlock_irq(&hwif->lock);
111 return snprintf(buf, 20, "%u\n", msecs);
114 ssize_t ide_park_store(struct device *dev, struct device_attribute *attr,
115 const char *buf, size_t len)
117 #define MAX_PARK_TIMEOUT 30000
118 ide_drive_t *drive = to_ide_device(dev);
122 rc = kstrtol(buf, 10, &input);
127 if (input > MAX_PARK_TIMEOUT) {
128 input = MAX_PARK_TIMEOUT;
132 mutex_lock(&ide_setting_mtx);
134 if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
136 else if (input || drive->dev_flags & IDE_DFLAG_PARKED)
137 issue_park_cmd(drive, msecs_to_jiffies(input));
139 if (drive->media == ide_disk)
142 drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
145 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
151 mutex_unlock(&ide_setting_mtx);
153 return rc ? rc : len;