blob: 8282c6086e6ab6724820a966b4fa31b1024808df [file] [log] [blame]
Bartlomiej Zolnierkiewicze2984c62008-12-29 20:27:37 +01001#include <linux/kernel.h>
2#include <linux/ide.h>
3#include <linux/hdreg.h>
4
5int 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
39int 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
79void 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
109ide_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
165out_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 */
179void 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->hwgroup->rq = NULL;
198
199 if (blk_end_request(rq, 0, 0))
200 BUG();
201}
202
203void 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}