i2c: tegra: remove support for I2C_M_REV_DIR_ADDR
[linux-2.6.git] / drivers / ide / ide-pm.c
1 #include <linux/kernel.h>
2 #include <linux/gfp.h>
3 #include <linux/ide.h>
4
5 int generic_ide_suspend(struct device *dev, pm_message_t mesg)
6 {
7         ide_drive_t *drive = dev_get_drvdata(dev);
8         ide_drive_t *pair = ide_get_pair_dev(drive);
9         ide_hwif_t *hwif = drive->hwif;
10         struct request *rq;
11         struct request_pm_state rqpm;
12         int ret;
13
14         if (ide_port_acpi(hwif)) {
15                 /* call ACPI _GTM only once */
16                 if ((drive->dn & 1) == 0 || pair == NULL)
17                         ide_acpi_get_timing(hwif);
18         }
19
20         memset(&rqpm, 0, sizeof(rqpm));
21         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
22         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
23         rq->special = &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         if (ret == 0 && ide_port_acpi(hwif)) {
33                 /* call ACPI _PS3 only after both devices are suspended */
34                 if ((drive->dn & 1) || pair == NULL)
35                         ide_acpi_set_state(hwif, 0);
36         }
37
38         return ret;
39 }
40
41 int generic_ide_resume(struct device *dev)
42 {
43         ide_drive_t *drive = dev_get_drvdata(dev);
44         ide_drive_t *pair = ide_get_pair_dev(drive);
45         ide_hwif_t *hwif = drive->hwif;
46         struct request *rq;
47         struct request_pm_state rqpm;
48         int err;
49
50         if (ide_port_acpi(hwif)) {
51                 /* call ACPI _PS0 / _STM only once */
52                 if ((drive->dn & 1) == 0 || pair == NULL) {
53                         ide_acpi_set_state(hwif, 1);
54                         ide_acpi_push_timing(hwif);
55                 }
56
57                 ide_acpi_exec_tfs(drive);
58         }
59
60         memset(&rqpm, 0, sizeof(rqpm));
61         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
62         rq->cmd_type = REQ_TYPE_PM_RESUME;
63         rq->cmd_flags |= REQ_PREEMPT;
64         rq->special = &rqpm;
65         rqpm.pm_step = IDE_PM_START_RESUME;
66         rqpm.pm_state = PM_EVENT_ON;
67
68         err = blk_execute_rq(drive->queue, NULL, rq, 1);
69         blk_put_request(rq);
70
71         if (err == 0 && dev->driver) {
72                 struct ide_driver *drv = to_ide_driver(dev->driver);
73
74                 if (drv->resume)
75                         drv->resume(drive);
76         }
77
78         return err;
79 }
80
81 void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
82 {
83         struct request_pm_state *pm = rq->special;
84
85 #ifdef DEBUG_PM
86         printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
87                 drive->name, pm->pm_step);
88 #endif
89         if (drive->media != ide_disk)
90                 return;
91
92         switch (pm->pm_step) {
93         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
94                 if (pm->pm_state == PM_EVENT_FREEZE)
95                         pm->pm_step = IDE_PM_COMPLETED;
96                 else
97                         pm->pm_step = IDE_PM_STANDBY;
98                 break;
99         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
100                 pm->pm_step = IDE_PM_COMPLETED;
101                 break;
102         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
103                 pm->pm_step = IDE_PM_IDLE;
104                 break;
105         case IDE_PM_IDLE:               /* Resume step 2 (idle)*/
106                 pm->pm_step = IDE_PM_RESTORE_DMA;
107                 break;
108         }
109 }
110
111 ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
112 {
113         struct request_pm_state *pm = rq->special;
114         struct ide_cmd cmd = { };
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                         cmd.tf.command = ATA_CMD_FLUSH_EXT;
128                 else
129                         cmd.tf.command = ATA_CMD_FLUSH;
130                 goto out_do_tf;
131         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
132                 cmd.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                 cmd.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
164         return ide_stopped;
165
166 out_do_tf:
167         cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
168         cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
169         cmd.protocol = ATA_PROT_NODATA;
170
171         return do_rw_taskfile(drive, &cmd);
172 }
173
174 /**
175  *      ide_complete_pm_rq - end the current Power Management request
176  *      @drive: target drive
177  *      @rq: request
178  *
179  *      This function cleans up the current PM request and stops the queue
180  *      if necessary.
181  */
182 void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
183 {
184         struct request_queue *q = drive->queue;
185         struct request_pm_state *pm = rq->special;
186         unsigned long flags;
187
188         ide_complete_power_step(drive, rq);
189         if (pm->pm_step != IDE_PM_COMPLETED)
190                 return;
191
192 #ifdef DEBUG_PM
193         printk("%s: completing PM request, %s\n", drive->name,
194                (rq->cmd_type == REQ_TYPE_PM_SUSPEND) ? "suspend" : "resume");
195 #endif
196         spin_lock_irqsave(q->queue_lock, flags);
197         if (rq->cmd_type == REQ_TYPE_PM_SUSPEND)
198                 blk_stop_queue(q);
199         else
200                 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
201         spin_unlock_irqrestore(q->queue_lock, flags);
202
203         drive->hwif->rq = NULL;
204
205         if (blk_end_request(rq, 0, 0))
206                 BUG();
207 }
208
209 void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
210 {
211         struct request_pm_state *pm = rq->special;
212
213         if (rq->cmd_type == REQ_TYPE_PM_SUSPEND &&
214             pm->pm_step == IDE_PM_START_SUSPEND)
215                 /* Mark drive blocked when starting the suspend sequence. */
216                 drive->dev_flags |= IDE_DFLAG_BLOCKED;
217         else if (rq->cmd_type == REQ_TYPE_PM_RESUME &&
218                  pm->pm_step == IDE_PM_START_RESUME) {
219                 /*
220                  * The first thing we do on wakeup is to wait for BSY bit to
221                  * go away (with a looong timeout) as a drive on this hwif may
222                  * just be POSTing itself.
223                  * We do that before even selecting as the "other" device on
224                  * the bus may be broken enough to walk on our toes at this
225                  * point.
226                  */
227                 ide_hwif_t *hwif = drive->hwif;
228                 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
229                 struct request_queue *q = drive->queue;
230                 unsigned long flags;
231                 int rc;
232 #ifdef DEBUG_PM
233                 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
234 #endif
235                 rc = ide_wait_not_busy(hwif, 35000);
236                 if (rc)
237                         printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
238                 tp_ops->dev_select(drive);
239                 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
240                 rc = ide_wait_not_busy(hwif, 100000);
241                 if (rc)
242                         printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
243
244                 spin_lock_irqsave(q->queue_lock, flags);
245                 blk_start_queue(q);
246                 spin_unlock_irqrestore(q->queue_lock, flags);
247         }
248 }