blob: f41558a0bcd1742a75503a52028399e093d46403 [file] [log] [blame]
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +02001#include <linux/kernel.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09002#include <linux/gfp.h>
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +02003#include <linux/ide.h>
4#include <linux/jiffies.h>
5#include <linux/blkdev.h>
6
7DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);
8
9static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
10{
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +010011 ide_hwif_t *hwif = drive->hwif;
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020012 struct request_queue *q = drive->queue;
13 struct request *rq;
14 int rc;
15
16 timeout += jiffies;
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +010017 spin_lock_irq(&hwif->lock);
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020018 if (drive->dev_flags & IDE_DFLAG_PARKED) {
Bartlomiej Zolnierkiewicz2a2ca6a2008-12-29 20:27:31 +010019 int reset_timer = time_before(timeout, drive->sleep);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +010020 int start_queue = 0;
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020021
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020022 drive->sleep = timeout;
23 wake_up_all(&ide_park_wq);
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +010024 if (reset_timer && del_timer(&hwif->timer))
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +010025 start_queue = 1;
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +010026 spin_unlock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +010027
Tejun Heo853280a2009-04-19 07:00:41 +090028 if (start_queue)
29 blk_run_queue(q);
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020030 return;
31 }
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +010032 spin_unlock_irq(&hwif->lock);
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020033
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;
Jens Axboe7eaceac2011-03-10 08:52:07 +010055 elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020056
57out:
58 return;
59}
60
Bartlomiej Zolnierkiewiczc4e66c32009-03-24 23:22:44 +010061ide_startstop_t ide_do_park_unpark(ide_drive_t *drive, struct request *rq)
62{
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +010063 struct ide_cmd cmd;
64 struct ide_taskfile *tf = &cmd.tf;
Bartlomiej Zolnierkiewiczc4e66c32009-03-24 23:22:44 +010065
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +010066 memset(&cmd, 0, sizeof(cmd));
Bartlomiej Zolnierkiewiczc4e66c32009-03-24 23:22:44 +010067 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;
Sergei Shtylyov60f85012009-04-08 14:13:01 +020075 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
76 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
Bartlomiej Zolnierkiewiczc4e66c32009-03-24 23:22:44 +010077 } else /* cmd == REQ_UNPARK_HEADS */
78 tf->command = ATA_CMD_CHK_POWER;
79
Bartlomiej Zolnierkiewiczd364c7f2009-03-27 12:46:42 +010080 cmd.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER;
Bartlomiej Zolnierkiewicz0dfb9912009-03-27 12:46:39 +010081 cmd.protocol = ATA_PROT_NODATA;
82
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +010083 cmd.rq = rq;
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +010084
85 return do_rw_taskfile(drive, &cmd);
Bartlomiej Zolnierkiewiczc4e66c32009-03-24 23:22:44 +010086}
87
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020088ssize_t ide_park_show(struct device *dev, struct device_attribute *attr,
89 char *buf)
90{
91 ide_drive_t *drive = to_ide_device(dev);
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +010092 ide_hwif_t *hwif = drive->hwif;
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020093 unsigned long now;
94 unsigned int msecs;
95
96 if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
97 return -EOPNOTSUPP;
98
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +010099 spin_lock_irq(&hwif->lock);
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200100 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;
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100106 spin_unlock_irq(&hwif->lock);
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200107
108 return snprintf(buf, 20, "%u\n", msecs);
109}
110
111ssize_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
Jingoo Han79c8fa02013-07-19 16:01:26 +0900119 rc = kstrtol(buf, 10, &input);
120 if (rc)
121 return rc;
122 if (input < -2)
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200123 return -EINVAL;
124 if (input > MAX_PARK_TIMEOUT) {
125 input = MAX_PARK_TIMEOUT;
126 rc = -EOVERFLOW;
127 }
128
129 mutex_lock(&ide_setting_mtx);
130 if (input >= 0) {
131 if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
132 rc = -EOPNOTSUPP;
133 else if (input || drive->dev_flags & IDE_DFLAG_PARKED)
134 issue_park_cmd(drive, msecs_to_jiffies(input));
135 } else {
136 if (drive->media == ide_disk)
137 switch (input) {
138 case -1:
139 drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
140 break;
141 case -2:
142 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
143 break;
144 }
145 else
146 rc = -EOPNOTSUPP;
147 }
148 mutex_unlock(&ide_setting_mtx);
149
150 return rc ? rc : len;
151}