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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
Christoph Hellwigaebf5262017-01-31 16:57:31 +010034 rq = blk_get_request(q, REQ_OP_DRV_IN, __GFP_RECLAIM);
Christoph Hellwig82ed4db2017-01-27 09:46:29 +010035 scsi_req(rq)->cmd[0] = REQ_PARK_HEADS;
36 scsi_req(rq)->cmd_len = 1;
Christoph Hellwig2f5a8e802017-01-31 16:57:30 +010037 ide_req(rq)->type = ATA_PRIV_MISC;
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020038 rq->special = &timeout;
Christoph Hellwigb7819b92017-04-20 16:02:55 +020039 blk_execute_rq(q, NULL, rq, 1);
Christoph Hellwig17d53632017-04-20 16:03:01 +020040 rc = scsi_req(rq)->result ? -EIO : 0;
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020041 blk_put_request(rq);
42 if (rc)
43 goto out;
44
45 /*
46 * Make sure that *some* command is sent to the drive after the
47 * timeout has expired, so power management will be reenabled.
48 */
Christoph Hellwigaebf5262017-01-31 16:57:31 +010049 rq = blk_get_request(q, REQ_OP_DRV_IN, GFP_NOWAIT);
Joe Lawrencea492f072014-08-28 08:15:21 -060050 if (IS_ERR(rq))
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020051 goto out;
52
Christoph Hellwig82ed4db2017-01-27 09:46:29 +010053 scsi_req(rq)->cmd[0] = REQ_UNPARK_HEADS;
54 scsi_req(rq)->cmd_len = 1;
Christoph Hellwig2f5a8e802017-01-31 16:57:30 +010055 ide_req(rq)->type = ATA_PRIV_MISC;
Jens Axboe7eaceac2011-03-10 08:52:07 +010056 elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +020057
58out:
59 return;
60}
61
Bartlomiej Zolnierkiewiczc4e66c32009-03-24 23:22:44 +010062ide_startstop_t ide_do_park_unpark(ide_drive_t *drive, struct request *rq)
63{
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +010064 struct ide_cmd cmd;
65 struct ide_taskfile *tf = &cmd.tf;
Bartlomiej Zolnierkiewiczc4e66c32009-03-24 23:22:44 +010066
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +010067 memset(&cmd, 0, sizeof(cmd));
Christoph Hellwig82ed4db2017-01-27 09:46:29 +010068 if (scsi_req(rq)->cmd[0] == REQ_PARK_HEADS) {
Bartlomiej Zolnierkiewiczc4e66c32009-03-24 23:22:44 +010069 drive->sleep = *(unsigned long *)rq->special;
70 drive->dev_flags |= IDE_DFLAG_SLEEPING;
71 tf->command = ATA_CMD_IDLEIMMEDIATE;
72 tf->feature = 0x44;
73 tf->lbal = 0x4c;
74 tf->lbam = 0x4e;
75 tf->lbah = 0x55;
Sergei Shtylyov60f85012009-04-08 14:13:01 +020076 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
77 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_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
Jingoo Han79c8fa02013-07-19 16:01:26 +0900120 rc = kstrtol(buf, 10, &input);
121 if (rc)
122 return rc;
123 if (input < -2)
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200124 return -EINVAL;
125 if (input > MAX_PARK_TIMEOUT) {
126 input = MAX_PARK_TIMEOUT;
127 rc = -EOVERFLOW;
128 }
129
130 mutex_lock(&ide_setting_mtx);
131 if (input >= 0) {
132 if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
133 rc = -EOPNOTSUPP;
134 else if (input || drive->dev_flags & IDE_DFLAG_PARKED)
135 issue_park_cmd(drive, msecs_to_jiffies(input));
136 } else {
137 if (drive->media == ide_disk)
138 switch (input) {
139 case -1:
140 drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
141 break;
142 case -2:
143 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
144 break;
145 }
146 else
147 rc = -EOPNOTSUPP;
148 }
149 mutex_unlock(&ide_setting_mtx);
150
151 return rc ? rc : len;
152}