ide: merge ide_hwgroup_t with ide_hwif_t (v2)
[linux-2.6.git] / drivers / ide / ide-pm.c
1 #include <linux/kernel.h>
2 #include <linux/ide.h>
3 #include <linux/hdreg.h>
4
5 int generic_ide_suspend(struct device *dev, pm_message_t mesg)
6 {
7         ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive);
8         ide_hwif_t *hwif = HWIF(drive);
9         struct request *rq;
10         struct request_pm_state rqpm;
11         ide_task_t args;
12         int ret;
13
14         /* call ACPI _GTM only once */
15         if ((drive->dn & 1) == 0 || pair == NULL)
16                 ide_acpi_get_timing(hwif);
17
18         memset(&rqpm, 0, sizeof(rqpm));
19         memset(&args, 0, sizeof(args));
20         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
21         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
22         rq->special = &args;
23         rq->data = &rqpm;
24         rqpm.pm_step = IDE_PM_START_SUSPEND;
25         if (mesg.event == PM_EVENT_PRETHAW)
26                 mesg.event = PM_EVENT_FREEZE;
27         rqpm.pm_state = mesg.event;
28
29         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
30         blk_put_request(rq);
31
32         /* call ACPI _PS3 only after both devices are suspended */
33         if (ret == 0 && ((drive->dn & 1) || pair == NULL))
34                 ide_acpi_set_state(hwif, 0);
35
36         return ret;
37 }
38
39 int generic_ide_resume(struct device *dev)
40 {
41         ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive);
42         ide_hwif_t *hwif = HWIF(drive);
43         struct request *rq;
44         struct request_pm_state rqpm;
45         ide_task_t args;
46         int err;
47
48         /* call ACPI _PS0 / _STM only once */
49         if ((drive->dn & 1) == 0 || pair == NULL) {
50                 ide_acpi_set_state(hwif, 1);
51                 ide_acpi_push_timing(hwif);
52         }
53
54         ide_acpi_exec_tfs(drive);
55
56         memset(&rqpm, 0, sizeof(rqpm));
57         memset(&args, 0, sizeof(args));
58         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
59         rq->cmd_type = REQ_TYPE_PM_RESUME;
60         rq->cmd_flags |= REQ_PREEMPT;
61         rq->special = &args;
62         rq->data = &rqpm;
63         rqpm.pm_step = IDE_PM_START_RESUME;
64         rqpm.pm_state = PM_EVENT_ON;
65
66         err = blk_execute_rq(drive->queue, NULL, rq, 1);
67         blk_put_request(rq);
68
69         if (err == 0 && dev->driver) {
70                 ide_driver_t *drv = to_ide_driver(dev->driver);
71
72                 if (drv->resume)
73                         drv->resume(drive);
74         }
75
76         return err;
77 }
78
79 void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
80 {
81         struct request_pm_state *pm = rq->data;
82
83 #ifdef DEBUG_PM
84         printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
85                 drive->name, pm->pm_step);
86 #endif
87         if (drive->media != ide_disk)
88                 return;
89
90         switch (pm->pm_step) {
91         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
92                 if (pm->pm_state == PM_EVENT_FREEZE)
93                         pm->pm_step = IDE_PM_COMPLETED;
94                 else
95                         pm->pm_step = IDE_PM_STANDBY;
96                 break;
97         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
98                 pm->pm_step = IDE_PM_COMPLETED;
99                 break;
100         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
101                 pm->pm_step = IDE_PM_IDLE;
102                 break;
103         case IDE_PM_IDLE:               /* Resume step 2 (idle)*/
104                 pm->pm_step = IDE_PM_RESTORE_DMA;
105                 break;
106         }
107 }
108
109 ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
110 {
111         struct request_pm_state *pm = rq->data;
112         ide_task_t *args = rq->special;
113
114         memset(args, 0, sizeof(*args));
115
116         switch (pm->pm_step) {
117         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
118                 if (drive->media != ide_disk)
119                         break;
120                 /* Not supported? Switch to next step now. */
121                 if (ata_id_flush_enabled(drive->id) == 0 ||
122                     (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
123                         ide_complete_power_step(drive, rq);
124                         return ide_stopped;
125                 }
126                 if (ata_id_flush_ext_enabled(drive->id))
127                         args->tf.command = ATA_CMD_FLUSH_EXT;
128                 else
129                         args->tf.command = ATA_CMD_FLUSH;
130                 goto out_do_tf;
131         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
132                 args->tf.command = ATA_CMD_STANDBYNOW1;
133                 goto out_do_tf;
134         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
135                 ide_set_max_pio(drive);
136                 /*
137                  * skip IDE_PM_IDLE for ATAPI devices
138                  */
139                 if (drive->media != ide_disk)
140                         pm->pm_step = IDE_PM_RESTORE_DMA;
141                 else
142                         ide_complete_power_step(drive, rq);
143                 return ide_stopped;
144         case IDE_PM_IDLE:               /* Resume step 2 (idle) */
145                 args->tf.command = ATA_CMD_IDLEIMMEDIATE;
146                 goto out_do_tf;
147         case IDE_PM_RESTORE_DMA:        /* Resume step 3 (restore DMA) */
148                 /*
149                  * Right now, all we do is call ide_set_dma(drive),
150                  * we could be smarter and check for current xfer_speed
151                  * in struct drive etc...
152                  */
153                 if (drive->hwif->dma_ops == NULL)
154                         break;
155                 /*
156                  * TODO: respect IDE_DFLAG_USING_DMA
157                  */
158                 ide_set_dma(drive);
159                 break;
160         }
161
162         pm->pm_step = IDE_PM_COMPLETED;
163         return ide_stopped;
164
165 out_do_tf:
166         args->tf_flags   = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
167         args->data_phase = TASKFILE_NO_DATA;
168         return do_rw_taskfile(drive, args);
169 }
170
171 /**
172  *      ide_complete_pm_request - end the current Power Management request
173  *      @drive: target drive
174  *      @rq: request
175  *
176  *      This function cleans up the current PM request and stops the queue
177  *      if necessary.
178  */
179 void ide_complete_pm_request(ide_drive_t *drive, struct request *rq)
180 {
181         struct request_queue *q = drive->queue;
182         unsigned long flags;
183
184 #ifdef DEBUG_PM
185         printk("%s: completing PM request, %s\n", drive->name,
186                blk_pm_suspend_request(rq) ? "suspend" : "resume");
187 #endif
188         spin_lock_irqsave(q->queue_lock, flags);
189         if (blk_pm_suspend_request(rq)) {
190                 blk_stop_queue(q);
191         } else {
192                 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
193                 blk_start_queue(q);
194         }
195         spin_unlock_irqrestore(q->queue_lock, flags);
196
197         drive->hwif->rq = NULL;
198
199         if (blk_end_request(rq, 0, 0))
200                 BUG();
201 }
202
203 void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
204 {
205         struct request_pm_state *pm = rq->data;
206
207         if (blk_pm_suspend_request(rq) &&
208             pm->pm_step == IDE_PM_START_SUSPEND)
209                 /* Mark drive blocked when starting the suspend sequence. */
210                 drive->dev_flags |= IDE_DFLAG_BLOCKED;
211         else if (blk_pm_resume_request(rq) &&
212                  pm->pm_step == IDE_PM_START_RESUME) {
213                 /*
214                  * The first thing we do on wakeup is to wait for BSY bit to
215                  * go away (with a looong timeout) as a drive on this hwif may
216                  * just be POSTing itself.
217                  * We do that before even selecting as the "other" device on
218                  * the bus may be broken enough to walk on our toes at this
219                  * point.
220                  */
221                 ide_hwif_t *hwif = drive->hwif;
222                 int rc;
223 #ifdef DEBUG_PM
224                 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
225 #endif
226                 rc = ide_wait_not_busy(hwif, 35000);
227                 if (rc)
228                         printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
229                 SELECT_DRIVE(drive);
230                 hwif->tp_ops->set_irq(hwif, 1);
231                 rc = ide_wait_not_busy(hwif, 100000);
232                 if (rc)
233                         printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
234         }
235 }