Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394...
[linux-2.6] / drivers / ide / ide-pm.c
1 #include <linux/kernel.h>
2 #include <linux/ide.h>
3
4 int generic_ide_suspend(struct device *dev, pm_message_t mesg)
5 {
6         ide_drive_t *drive = dev_get_drvdata(dev);
7         ide_drive_t *pair = ide_get_pair_dev(drive);
8         ide_hwif_t *hwif = drive->hwif;
9         struct request *rq;
10         struct request_pm_state rqpm;
11         int ret;
12
13         /* call ACPI _GTM only once */
14         if ((drive->dn & 1) == 0 || pair == NULL)
15                 ide_acpi_get_timing(hwif);
16
17         memset(&rqpm, 0, sizeof(rqpm));
18         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
19         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
20         rq->special = &rqpm;
21         rqpm.pm_step = IDE_PM_START_SUSPEND;
22         if (mesg.event == PM_EVENT_PRETHAW)
23                 mesg.event = PM_EVENT_FREEZE;
24         rqpm.pm_state = mesg.event;
25
26         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
27         blk_put_request(rq);
28
29         /* call ACPI _PS3 only after both devices are suspended */
30         if (ret == 0 && ((drive->dn & 1) || pair == NULL))
31                 ide_acpi_set_state(hwif, 0);
32
33         return ret;
34 }
35
36 int generic_ide_resume(struct device *dev)
37 {
38         ide_drive_t *drive = dev_get_drvdata(dev);
39         ide_drive_t *pair = ide_get_pair_dev(drive);
40         ide_hwif_t *hwif = drive->hwif;
41         struct request *rq;
42         struct request_pm_state rqpm;
43         int err;
44
45         /* call ACPI _PS0 / _STM only once */
46         if ((drive->dn & 1) == 0 || pair == NULL) {
47                 ide_acpi_set_state(hwif, 1);
48                 ide_acpi_push_timing(hwif);
49         }
50
51         ide_acpi_exec_tfs(drive);
52
53         memset(&rqpm, 0, sizeof(rqpm));
54         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
55         rq->cmd_type = REQ_TYPE_PM_RESUME;
56         rq->cmd_flags |= REQ_PREEMPT;
57         rq->special = &rqpm;
58         rqpm.pm_step = IDE_PM_START_RESUME;
59         rqpm.pm_state = PM_EVENT_ON;
60
61         err = blk_execute_rq(drive->queue, NULL, rq, 1);
62         blk_put_request(rq);
63
64         if (err == 0 && dev->driver) {
65                 struct ide_driver *drv = to_ide_driver(dev->driver);
66
67                 if (drv->resume)
68                         drv->resume(drive);
69         }
70
71         return err;
72 }
73
74 void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
75 {
76         struct request_pm_state *pm = rq->special;
77
78 #ifdef DEBUG_PM
79         printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
80                 drive->name, pm->pm_step);
81 #endif
82         if (drive->media != ide_disk)
83                 return;
84
85         switch (pm->pm_step) {
86         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
87                 if (pm->pm_state == PM_EVENT_FREEZE)
88                         pm->pm_step = IDE_PM_COMPLETED;
89                 else
90                         pm->pm_step = IDE_PM_STANDBY;
91                 break;
92         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
93                 pm->pm_step = IDE_PM_COMPLETED;
94                 break;
95         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
96                 pm->pm_step = IDE_PM_IDLE;
97                 break;
98         case IDE_PM_IDLE:               /* Resume step 2 (idle)*/
99                 pm->pm_step = IDE_PM_RESTORE_DMA;
100                 break;
101         }
102 }
103
104 ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
105 {
106         struct request_pm_state *pm = rq->special;
107         struct ide_cmd cmd = { };
108
109         switch (pm->pm_step) {
110         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
111                 if (drive->media != ide_disk)
112                         break;
113                 /* Not supported? Switch to next step now. */
114                 if (ata_id_flush_enabled(drive->id) == 0 ||
115                     (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
116                         ide_complete_power_step(drive, rq);
117                         return ide_stopped;
118                 }
119                 if (ata_id_flush_ext_enabled(drive->id))
120                         cmd.tf.command = ATA_CMD_FLUSH_EXT;
121                 else
122                         cmd.tf.command = ATA_CMD_FLUSH;
123                 goto out_do_tf;
124         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
125                 cmd.tf.command = ATA_CMD_STANDBYNOW1;
126                 goto out_do_tf;
127         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
128                 ide_set_max_pio(drive);
129                 /*
130                  * skip IDE_PM_IDLE for ATAPI devices
131                  */
132                 if (drive->media != ide_disk)
133                         pm->pm_step = IDE_PM_RESTORE_DMA;
134                 else
135                         ide_complete_power_step(drive, rq);
136                 return ide_stopped;
137         case IDE_PM_IDLE:               /* Resume step 2 (idle) */
138                 cmd.tf.command = ATA_CMD_IDLEIMMEDIATE;
139                 goto out_do_tf;
140         case IDE_PM_RESTORE_DMA:        /* Resume step 3 (restore DMA) */
141                 /*
142                  * Right now, all we do is call ide_set_dma(drive),
143                  * we could be smarter and check for current xfer_speed
144                  * in struct drive etc...
145                  */
146                 if (drive->hwif->dma_ops == NULL)
147                         break;
148                 /*
149                  * TODO: respect IDE_DFLAG_USING_DMA
150                  */
151                 ide_set_dma(drive);
152                 break;
153         }
154
155         pm->pm_step = IDE_PM_COMPLETED;
156
157         return ide_stopped;
158
159 out_do_tf:
160         cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
161         cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
162         cmd.protocol = ATA_PROT_NODATA;
163
164         return do_rw_taskfile(drive, &cmd);
165 }
166
167 /**
168  *      ide_complete_pm_rq - end the current Power Management request
169  *      @drive: target drive
170  *      @rq: request
171  *
172  *      This function cleans up the current PM request and stops the queue
173  *      if necessary.
174  */
175 void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
176 {
177         struct request_queue *q = drive->queue;
178         struct request_pm_state *pm = rq->special;
179         unsigned long flags;
180
181         ide_complete_power_step(drive, rq);
182         if (pm->pm_step != IDE_PM_COMPLETED)
183                 return;
184
185 #ifdef DEBUG_PM
186         printk("%s: completing PM request, %s\n", drive->name,
187                blk_pm_suspend_request(rq) ? "suspend" : "resume");
188 #endif
189         spin_lock_irqsave(q->queue_lock, flags);
190         if (blk_pm_suspend_request(rq))
191                 blk_stop_queue(q);
192         else
193                 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
194         spin_unlock_irqrestore(q->queue_lock, flags);
195
196         drive->hwif->rq = NULL;
197
198         if (blk_end_request(rq, 0, 0))
199                 BUG();
200 }
201
202 void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
203 {
204         struct request_pm_state *pm = rq->special;
205
206         if (blk_pm_suspend_request(rq) &&
207             pm->pm_step == IDE_PM_START_SUSPEND)
208                 /* Mark drive blocked when starting the suspend sequence. */
209                 drive->dev_flags |= IDE_DFLAG_BLOCKED;
210         else if (blk_pm_resume_request(rq) &&
211                  pm->pm_step == IDE_PM_START_RESUME) {
212                 /*
213                  * The first thing we do on wakeup is to wait for BSY bit to
214                  * go away (with a looong timeout) as a drive on this hwif may
215                  * just be POSTing itself.
216                  * We do that before even selecting as the "other" device on
217                  * the bus may be broken enough to walk on our toes at this
218                  * point.
219                  */
220                 ide_hwif_t *hwif = drive->hwif;
221                 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
222                 struct request_queue *q = drive->queue;
223                 unsigned long flags;
224                 int rc;
225 #ifdef DEBUG_PM
226                 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
227 #endif
228                 rc = ide_wait_not_busy(hwif, 35000);
229                 if (rc)
230                         printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
231                 tp_ops->dev_select(drive);
232                 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
233                 rc = ide_wait_not_busy(hwif, 100000);
234                 if (rc)
235                         printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
236
237                 spin_lock_irqsave(q->queue_lock, flags);
238                 blk_start_queue(q);
239                 spin_unlock_irqrestore(q->queue_lock, flags);
240         }
241 }