Root/drivers/ide/ide-pm.c

1#include <linux/kernel.h>
2#include <linux/gfp.h>
3#include <linux/ide.h>
4
5int generic_ide_suspend(struct device *dev, pm_message_t mesg)
6{
7    ide_drive_t *drive = to_ide_device(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
41int generic_ide_resume(struct device *dev)
42{
43    ide_drive_t *drive = to_ide_device(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
81void 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
111ide_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
166out_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 */
182void 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
209void 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}
249

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