blob: 9490b446519f44a3082543adf966eb523c3a6397 [file] [log] [blame]
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +02001#include <linux/kernel.h>
2#include <linux/ide.h>
3#include <linux/jiffies.h>
4#include <linux/blkdev.h>
5
6DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);
7
8static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
9{
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +010010 ide_hwif_t *hwif = drive->hwif;
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020011 struct request_queue *q = drive->queue;
12 struct request *rq;
13 int rc;
14
15 timeout += jiffies;
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +010016 spin_lock_irq(&hwif->lock);
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020017 if (drive->dev_flags & IDE_DFLAG_PARKED) {
Bartlomiej Zolnierkiewicz2a2ca6a2008-12-29 20:27:31 +010018 int reset_timer = time_before(timeout, drive->sleep);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +010019 int start_queue = 0;
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020020
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020021 drive->sleep = timeout;
22 wake_up_all(&ide_park_wq);
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +010023 if (reset_timer && del_timer(&hwif->timer))
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +010024 start_queue = 1;
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +010025 spin_unlock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +010026
27 if (start_queue) {
28 spin_lock_irq(q->queue_lock);
29 blk_start_queueing(q);
30 spin_unlock_irq(q->queue_lock);
31 }
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020032 return;
33 }
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +010034 spin_unlock_irq(&hwif->lock);
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020035
36 rq = blk_get_request(q, READ, __GFP_WAIT);
37 rq->cmd[0] = REQ_PARK_HEADS;
38 rq->cmd_len = 1;
39 rq->cmd_type = REQ_TYPE_SPECIAL;
40 rq->special = &timeout;
41 rc = blk_execute_rq(q, NULL, rq, 1);
42 blk_put_request(rq);
43 if (rc)
44 goto out;
45
46 /*
47 * Make sure that *some* command is sent to the drive after the
48 * timeout has expired, so power management will be reenabled.
49 */
50 rq = blk_get_request(q, READ, GFP_NOWAIT);
51 if (unlikely(!rq))
52 goto out;
53
54 rq->cmd[0] = REQ_UNPARK_HEADS;
55 rq->cmd_len = 1;
56 rq->cmd_type = REQ_TYPE_SPECIAL;
57 elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 1);
58
59out:
60 return;
61}
62
Bartlomiej Zolnierkiewiczc4e66c32009-03-24 23:22:44 +010063ide_startstop_t ide_do_park_unpark(ide_drive_t *drive, struct request *rq)
64{
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +010065 struct ide_cmd cmd;
66 struct ide_taskfile *tf = &cmd.tf;
Bartlomiej Zolnierkiewiczc4e66c32009-03-24 23:22:44 +010067
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +010068 memset(&cmd, 0, sizeof(cmd));
Bartlomiej Zolnierkiewiczc4e66c32009-03-24 23:22:44 +010069 if (rq->cmd[0] == REQ_PARK_HEADS) {
70 drive->sleep = *(unsigned long *)rq->special;
71 drive->dev_flags |= IDE_DFLAG_SLEEPING;
72 tf->command = ATA_CMD_IDLEIMMEDIATE;
73 tf->feature = 0x44;
74 tf->lbal = 0x4c;
75 tf->lbam = 0x4e;
76 tf->lbah = 0x55;
Bartlomiej Zolnierkiewiczd364c7f2009-03-27 12:46:42 +010077 cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
Bartlomiej Zolnierkiewiczc4e66c32009-03-24 23:22:44 +010078 } else /* cmd == REQ_UNPARK_HEADS */
79 tf->command = ATA_CMD_CHK_POWER;
80
Bartlomiej Zolnierkiewiczd364c7f2009-03-27 12:46:42 +010081 cmd.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER;
Bartlomiej Zolnierkiewicz0dfb9912009-03-27 12:46:39 +010082 cmd.protocol = ATA_PROT_NODATA;
83
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +010084 cmd.rq = rq;
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +010085
86 return do_rw_taskfile(drive, &cmd);
Bartlomiej Zolnierkiewiczc4e66c32009-03-24 23:22:44 +010087}
88
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020089ssize_t ide_park_show(struct device *dev, struct device_attribute *attr,
90 char *buf)
91{
92 ide_drive_t *drive = to_ide_device(dev);
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +010093 ide_hwif_t *hwif = drive->hwif;
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020094 unsigned long now;
95 unsigned int msecs;
96
97 if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
98 return -EOPNOTSUPP;
99
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100100 spin_lock_irq(&hwif->lock);
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200101 now = jiffies;
102 if (drive->dev_flags & IDE_DFLAG_PARKED &&
103 time_after(drive->sleep, now))
104 msecs = jiffies_to_msecs(drive->sleep - now);
105 else
106 msecs = 0;
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100107 spin_unlock_irq(&hwif->lock);
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200108
109 return snprintf(buf, 20, "%u\n", msecs);
110}
111
112ssize_t ide_park_store(struct device *dev, struct device_attribute *attr,
113 const char *buf, size_t len)
114{
115#define MAX_PARK_TIMEOUT 30000
116 ide_drive_t *drive = to_ide_device(dev);
117 long int input;
118 int rc;
119
120 rc = strict_strtol(buf, 10, &input);
121 if (rc || input < -2)
122 return -EINVAL;
123 if (input > MAX_PARK_TIMEOUT) {
124 input = MAX_PARK_TIMEOUT;
125 rc = -EOVERFLOW;
126 }
127
128 mutex_lock(&ide_setting_mtx);
129 if (input >= 0) {
130 if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
131 rc = -EOPNOTSUPP;
132 else if (input || drive->dev_flags & IDE_DFLAG_PARKED)
133 issue_park_cmd(drive, msecs_to_jiffies(input));
134 } else {
135 if (drive->media == ide_disk)
136 switch (input) {
137 case -1:
138 drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
139 break;
140 case -2:
141 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
142 break;
143 }
144 else
145 rc = -EOPNOTSUPP;
146 }
147 mutex_unlock(&ide_setting_mtx);
148
149 return rc ? rc : len;
150}