1 #include <linux/kernel.h>
2 #include <linux/gfp.h>
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
issue_park_cmd(ide_drive_t * drive,unsigned long timeout)9 static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
10 {
11 ide_hwif_t *hwif = drive->hwif;
12 struct request_queue *q = drive->queue;
13 struct request *rq;
14 int rc;
15
16 timeout += jiffies;
17 spin_lock_irq(&hwif->lock);
18 if (drive->dev_flags & IDE_DFLAG_PARKED) {
19 int reset_timer = time_before(timeout, drive->sleep);
20 int start_queue = 0;
21
22 drive->sleep = timeout;
23 wake_up_all(&ide_park_wq);
24 if (reset_timer && del_timer(&hwif->timer))
25 start_queue = 1;
26 spin_unlock_irq(&hwif->lock);
27
28 if (start_queue)
29 blk_run_queue(q);
30 return;
31 }
32 spin_unlock_irq(&hwif->lock);
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);
56
57 out:
58 return;
59 }
60
ide_do_park_unpark(ide_drive_t * drive,struct request * rq)61 ide_startstop_t ide_do_park_unpark(ide_drive_t *drive, struct request *rq)
62 {
63 struct ide_cmd cmd;
64 struct ide_taskfile *tf = &cmd.tf;
65
66 memset(&cmd, 0, sizeof(cmd));
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;
75 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
76 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
77 } else /* cmd == REQ_UNPARK_HEADS */
78 tf->command = ATA_CMD_CHK_POWER;
79
80 cmd.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER;
81 cmd.protocol = ATA_PROT_NODATA;
82
83 cmd.rq = rq;
84
85 return do_rw_taskfile(drive, &cmd);
86 }
87
ide_park_show(struct device * dev,struct device_attribute * attr,char * buf)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);
92 ide_hwif_t *hwif = drive->hwif;
93 unsigned long now;
94 unsigned int msecs;
95
96 if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
97 return -EOPNOTSUPP;
98
99 spin_lock_irq(&hwif->lock);
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;
106 spin_unlock_irq(&hwif->lock);
107
108 return snprintf(buf, 20, "%u\n", msecs);
109 }
110
ide_park_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)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 }
150