ide: use ata_tf_protocols enums
[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->driver_data, *pair = ide_get_pair_dev(drive);
7         ide_hwif_t *hwif = drive->hwif;
8         struct request *rq;
9         struct request_pm_state rqpm;
10         struct ide_cmd cmd;
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         memset(&cmd, 0, sizeof(cmd));
19         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
20         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
21         rq->special = &cmd;
22         rq->data = &rqpm;
23         rqpm.pm_step = IDE_PM_START_SUSPEND;
24         if (mesg.event == PM_EVENT_PRETHAW)
25                 mesg.event = PM_EVENT_FREEZE;
26         rqpm.pm_state = mesg.event;
27
28         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
29         blk_put_request(rq);
30
31         /* call ACPI _PS3 only after both devices are suspended */
32         if (ret == 0 && ((drive->dn & 1) || pair == NULL))
33                 ide_acpi_set_state(hwif, 0);
34
35         return ret;
36 }
37
38 int generic_ide_resume(struct device *dev)
39 {
40         ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive);
41         ide_hwif_t *hwif = drive->hwif;
42         struct request *rq;
43         struct request_pm_state rqpm;
44         struct ide_cmd cmd;
45         int err;
46
47         /* call ACPI _PS0 / _STM only once */
48         if ((drive->dn & 1) == 0 || pair == NULL) {
49                 ide_acpi_set_state(hwif, 1);
50                 ide_acpi_push_timing(hwif);
51         }
52
53         ide_acpi_exec_tfs(drive);
54
55         memset(&rqpm, 0, sizeof(rqpm));
56         memset(&cmd, 0, sizeof(cmd));
57         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
58         rq->cmd_type = REQ_TYPE_PM_RESUME;
59         rq->cmd_flags |= REQ_PREEMPT;
60         rq->special = &cmd;
61         rq->data = &rqpm;
62         rqpm.pm_step = IDE_PM_START_RESUME;
63         rqpm.pm_state = PM_EVENT_ON;
64
65         err = blk_execute_rq(drive->queue, NULL, rq, 1);
66         blk_put_request(rq);
67
68         if (err == 0 && dev->driver) {
69                 struct ide_driver *drv = to_ide_driver(dev->driver);
70
71                 if (drv->resume)
72                         drv->resume(drive);
73         }
74
75         return err;
76 }
77
78 void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
79 {
80         struct request_pm_state *pm = rq->data;
81
82 #ifdef DEBUG_PM
83         printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
84                 drive->name, pm->pm_step);
85 #endif
86         if (drive->media != ide_disk)
87                 return;
88
89         switch (pm->pm_step) {
90         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
91                 if (pm->pm_state == PM_EVENT_FREEZE)
92                         pm->pm_step = IDE_PM_COMPLETED;
93                 else
94                         pm->pm_step = IDE_PM_STANDBY;
95                 break;
96         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
97                 pm->pm_step = IDE_PM_COMPLETED;
98                 break;
99         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
100                 pm->pm_step = IDE_PM_IDLE;
101                 break;
102         case IDE_PM_IDLE:               /* Resume step 2 (idle)*/
103                 pm->pm_step = IDE_PM_RESTORE_DMA;
104                 break;
105         }
106 }
107
108 ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
109 {
110         struct request_pm_state *pm = rq->data;
111         struct ide_cmd *cmd = rq->special;
112
113         memset(cmd, 0, sizeof(*cmd));
114
115         switch (pm->pm_step) {
116         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
117                 if (drive->media != ide_disk)
118                         break;
119                 /* Not supported? Switch to next step now. */
120                 if (ata_id_flush_enabled(drive->id) == 0 ||
121                     (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
122                         ide_complete_power_step(drive, rq);
123                         return ide_stopped;
124                 }
125                 if (ata_id_flush_ext_enabled(drive->id))
126                         cmd->tf.command = ATA_CMD_FLUSH_EXT;
127                 else
128                         cmd->tf.command = ATA_CMD_FLUSH;
129                 goto out_do_tf;
130         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
131                 cmd->tf.command = ATA_CMD_STANDBYNOW1;
132                 goto out_do_tf;
133         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
134                 ide_set_max_pio(drive);
135                 /*
136                  * skip IDE_PM_IDLE for ATAPI devices
137                  */
138                 if (drive->media != ide_disk)
139                         pm->pm_step = IDE_PM_RESTORE_DMA;
140                 else
141                         ide_complete_power_step(drive, rq);
142                 return ide_stopped;
143         case IDE_PM_IDLE:               /* Resume step 2 (idle) */
144                 cmd->tf.command = ATA_CMD_IDLEIMMEDIATE;
145                 goto out_do_tf;
146         case IDE_PM_RESTORE_DMA:        /* Resume step 3 (restore DMA) */
147                 /*
148                  * Right now, all we do is call ide_set_dma(drive),
149                  * we could be smarter and check for current xfer_speed
150                  * in struct drive etc...
151                  */
152                 if (drive->hwif->dma_ops == NULL)
153                         break;
154                 /*
155                  * TODO: respect IDE_DFLAG_USING_DMA
156                  */
157                 ide_set_dma(drive);
158                 break;
159         }
160
161         pm->pm_step = IDE_PM_COMPLETED;
162
163         return ide_stopped;
164
165 out_do_tf:
166         cmd->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
167         cmd->protocol = ATA_PROT_NODATA;
168
169         return do_rw_taskfile(drive, cmd);
170 }
171
172 /**
173  *      ide_complete_pm_rq - end the current Power Management request
174  *      @drive: target drive
175  *      @rq: request
176  *
177  *      This function cleans up the current PM request and stops the queue
178  *      if necessary.
179  */
180 void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
181 {
182         struct request_queue *q = drive->queue;
183         struct request_pm_state *pm = rq->data;
184         unsigned long flags;
185
186         ide_complete_power_step(drive, rq);
187         if (pm->pm_step != IDE_PM_COMPLETED)
188                 return;
189
190 #ifdef DEBUG_PM
191         printk("%s: completing PM request, %s\n", drive->name,
192                blk_pm_suspend_request(rq) ? "suspend" : "resume");
193 #endif
194         spin_lock_irqsave(q->queue_lock, flags);
195         if (blk_pm_suspend_request(rq))
196                 blk_stop_queue(q);
197         else
198                 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
199         spin_unlock_irqrestore(q->queue_lock, flags);
200
201         drive->hwif->rq = NULL;
202
203         if (blk_end_request(rq, 0, 0))
204                 BUG();
205 }
206
207 void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
208 {
209         struct request_pm_state *pm = rq->data;
210
211         if (blk_pm_suspend_request(rq) &&
212             pm->pm_step == IDE_PM_START_SUSPEND)
213                 /* Mark drive blocked when starting the suspend sequence. */
214                 drive->dev_flags |= IDE_DFLAG_BLOCKED;
215         else if (blk_pm_resume_request(rq) &&
216                  pm->pm_step == IDE_PM_START_RESUME) {
217                 /*
218                  * The first thing we do on wakeup is to wait for BSY bit to
219                  * go away (with a looong timeout) as a drive on this hwif may
220                  * just be POSTing itself.
221                  * We do that before even selecting as the "other" device on
222                  * the bus may be broken enough to walk on our toes at this
223                  * point.
224                  */
225                 ide_hwif_t *hwif = drive->hwif;
226                 struct request_queue *q = drive->queue;
227                 unsigned long flags;
228                 int rc;
229 #ifdef DEBUG_PM
230                 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
231 #endif
232                 rc = ide_wait_not_busy(hwif, 35000);
233                 if (rc)
234                         printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
235                 SELECT_DRIVE(drive);
236                 hwif->tp_ops->set_irq(hwif, 1);
237                 rc = ide_wait_not_busy(hwif, 100000);
238                 if (rc)
239                         printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
240
241                 spin_lock_irqsave(q->queue_lock, flags);
242                 blk_start_queue(q);
243                 spin_unlock_irqrestore(q->queue_lock, flags);
244         }
245 }