279 lines
7.2 KiB
C
279 lines
7.2 KiB
C
#include <linux/kernel.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/ide.h>
|
|
|
|
int generic_ide_suspend(struct device *dev, pm_message_t mesg)
|
|
{
|
|
ide_drive_t *drive = to_ide_device(dev);
|
|
ide_drive_t *pair = ide_get_pair_dev(drive);
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
struct request *rq;
|
|
struct ide_pm_state rqpm;
|
|
int ret;
|
|
|
|
if (ide_port_acpi(hwif)) {
|
|
/* call ACPI _GTM only once */
|
|
if ((drive->dn & 1) == 0 || pair == NULL)
|
|
ide_acpi_get_timing(hwif);
|
|
}
|
|
|
|
memset(&rqpm, 0, sizeof(rqpm));
|
|
rq = blk_get_request(drive->queue, READ, __GFP_RECLAIM);
|
|
rq->cmd_type = REQ_TYPE_ATA_PM_SUSPEND;
|
|
rq->special = &rqpm;
|
|
rqpm.pm_step = IDE_PM_START_SUSPEND;
|
|
if (mesg.event == PM_EVENT_PRETHAW)
|
|
mesg.event = PM_EVENT_FREEZE;
|
|
rqpm.pm_state = mesg.event;
|
|
|
|
ret = blk_execute_rq(drive->queue, NULL, rq, 0);
|
|
blk_put_request(rq);
|
|
|
|
if (ret == 0 && ide_port_acpi(hwif)) {
|
|
/* call ACPI _PS3 only after both devices are suspended */
|
|
if ((drive->dn & 1) || pair == NULL)
|
|
ide_acpi_set_state(hwif, 0);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void ide_end_sync_rq(struct request *rq, int error)
|
|
{
|
|
complete(rq->end_io_data);
|
|
}
|
|
|
|
static int ide_pm_execute_rq(struct request *rq)
|
|
{
|
|
struct request_queue *q = rq->q;
|
|
DECLARE_COMPLETION_ONSTACK(wait);
|
|
|
|
rq->end_io_data = &wait;
|
|
rq->end_io = ide_end_sync_rq;
|
|
|
|
spin_lock_irq(q->queue_lock);
|
|
if (unlikely(blk_queue_dying(q))) {
|
|
rq->cmd_flags |= REQ_QUIET;
|
|
rq->errors = -ENXIO;
|
|
__blk_end_request_all(rq, rq->errors);
|
|
spin_unlock_irq(q->queue_lock);
|
|
return -ENXIO;
|
|
}
|
|
__elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
|
|
__blk_run_queue_uncond(q);
|
|
spin_unlock_irq(q->queue_lock);
|
|
|
|
wait_for_completion_io(&wait);
|
|
|
|
return rq->errors ? -EIO : 0;
|
|
}
|
|
|
|
int generic_ide_resume(struct device *dev)
|
|
{
|
|
ide_drive_t *drive = to_ide_device(dev);
|
|
ide_drive_t *pair = ide_get_pair_dev(drive);
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
struct request *rq;
|
|
struct ide_pm_state rqpm;
|
|
int err;
|
|
|
|
if (ide_port_acpi(hwif)) {
|
|
/* call ACPI _PS0 / _STM only once */
|
|
if ((drive->dn & 1) == 0 || pair == NULL) {
|
|
ide_acpi_set_state(hwif, 1);
|
|
ide_acpi_push_timing(hwif);
|
|
}
|
|
|
|
ide_acpi_exec_tfs(drive);
|
|
}
|
|
|
|
memset(&rqpm, 0, sizeof(rqpm));
|
|
rq = blk_get_request(drive->queue, READ, __GFP_RECLAIM);
|
|
rq->cmd_type = REQ_TYPE_ATA_PM_RESUME;
|
|
rq->cmd_flags |= REQ_PREEMPT;
|
|
rq->special = &rqpm;
|
|
rqpm.pm_step = IDE_PM_START_RESUME;
|
|
rqpm.pm_state = PM_EVENT_ON;
|
|
|
|
err = ide_pm_execute_rq(rq);
|
|
blk_put_request(rq);
|
|
|
|
if (err == 0 && dev->driver) {
|
|
struct ide_driver *drv = to_ide_driver(dev->driver);
|
|
|
|
if (drv->resume)
|
|
drv->resume(drive);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
|
|
{
|
|
struct ide_pm_state *pm = rq->special;
|
|
|
|
#ifdef DEBUG_PM
|
|
printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
|
|
drive->name, pm->pm_step);
|
|
#endif
|
|
if (drive->media != ide_disk)
|
|
return;
|
|
|
|
switch (pm->pm_step) {
|
|
case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
|
|
if (pm->pm_state == PM_EVENT_FREEZE)
|
|
pm->pm_step = IDE_PM_COMPLETED;
|
|
else
|
|
pm->pm_step = IDE_PM_STANDBY;
|
|
break;
|
|
case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
|
|
pm->pm_step = IDE_PM_COMPLETED;
|
|
break;
|
|
case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
|
|
pm->pm_step = IDE_PM_IDLE;
|
|
break;
|
|
case IDE_PM_IDLE: /* Resume step 2 (idle)*/
|
|
pm->pm_step = IDE_PM_RESTORE_DMA;
|
|
break;
|
|
}
|
|
}
|
|
|
|
ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
|
|
{
|
|
struct ide_pm_state *pm = rq->special;
|
|
struct ide_cmd cmd = { };
|
|
|
|
switch (pm->pm_step) {
|
|
case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
|
|
if (drive->media != ide_disk)
|
|
break;
|
|
/* Not supported? Switch to next step now. */
|
|
if (ata_id_flush_enabled(drive->id) == 0 ||
|
|
(drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
|
|
ide_complete_power_step(drive, rq);
|
|
return ide_stopped;
|
|
}
|
|
if (ata_id_flush_ext_enabled(drive->id))
|
|
cmd.tf.command = ATA_CMD_FLUSH_EXT;
|
|
else
|
|
cmd.tf.command = ATA_CMD_FLUSH;
|
|
goto out_do_tf;
|
|
case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
|
|
cmd.tf.command = ATA_CMD_STANDBYNOW1;
|
|
goto out_do_tf;
|
|
case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
|
|
ide_set_max_pio(drive);
|
|
/*
|
|
* skip IDE_PM_IDLE for ATAPI devices
|
|
*/
|
|
if (drive->media != ide_disk)
|
|
pm->pm_step = IDE_PM_RESTORE_DMA;
|
|
else
|
|
ide_complete_power_step(drive, rq);
|
|
return ide_stopped;
|
|
case IDE_PM_IDLE: /* Resume step 2 (idle) */
|
|
cmd.tf.command = ATA_CMD_IDLEIMMEDIATE;
|
|
goto out_do_tf;
|
|
case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */
|
|
/*
|
|
* Right now, all we do is call ide_set_dma(drive),
|
|
* we could be smarter and check for current xfer_speed
|
|
* in struct drive etc...
|
|
*/
|
|
if (drive->hwif->dma_ops == NULL)
|
|
break;
|
|
/*
|
|
* TODO: respect IDE_DFLAG_USING_DMA
|
|
*/
|
|
ide_set_dma(drive);
|
|
break;
|
|
}
|
|
|
|
pm->pm_step = IDE_PM_COMPLETED;
|
|
|
|
return ide_stopped;
|
|
|
|
out_do_tf:
|
|
cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
|
|
cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
|
|
cmd.protocol = ATA_PROT_NODATA;
|
|
|
|
return do_rw_taskfile(drive, &cmd);
|
|
}
|
|
|
|
/**
|
|
* ide_complete_pm_rq - end the current Power Management request
|
|
* @drive: target drive
|
|
* @rq: request
|
|
*
|
|
* This function cleans up the current PM request and stops the queue
|
|
* if necessary.
|
|
*/
|
|
void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
|
|
{
|
|
struct request_queue *q = drive->queue;
|
|
struct ide_pm_state *pm = rq->special;
|
|
unsigned long flags;
|
|
|
|
ide_complete_power_step(drive, rq);
|
|
if (pm->pm_step != IDE_PM_COMPLETED)
|
|
return;
|
|
|
|
#ifdef DEBUG_PM
|
|
printk("%s: completing PM request, %s\n", drive->name,
|
|
(rq->cmd_type == REQ_TYPE_ATA_PM_SUSPEND) ? "suspend" : "resume");
|
|
#endif
|
|
spin_lock_irqsave(q->queue_lock, flags);
|
|
if (rq->cmd_type == REQ_TYPE_ATA_PM_SUSPEND)
|
|
blk_stop_queue(q);
|
|
else
|
|
drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
|
|
spin_unlock_irqrestore(q->queue_lock, flags);
|
|
|
|
drive->hwif->rq = NULL;
|
|
|
|
if (blk_end_request(rq, 0, 0))
|
|
BUG();
|
|
}
|
|
|
|
void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
|
|
{
|
|
struct ide_pm_state *pm = rq->special;
|
|
|
|
if (rq->cmd_type == REQ_TYPE_ATA_PM_SUSPEND &&
|
|
pm->pm_step == IDE_PM_START_SUSPEND)
|
|
/* Mark drive blocked when starting the suspend sequence. */
|
|
drive->dev_flags |= IDE_DFLAG_BLOCKED;
|
|
else if (rq->cmd_type == REQ_TYPE_ATA_PM_RESUME &&
|
|
pm->pm_step == IDE_PM_START_RESUME) {
|
|
/*
|
|
* The first thing we do on wakeup is to wait for BSY bit to
|
|
* go away (with a looong timeout) as a drive on this hwif may
|
|
* just be POSTing itself.
|
|
* We do that before even selecting as the "other" device on
|
|
* the bus may be broken enough to walk on our toes at this
|
|
* point.
|
|
*/
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
const struct ide_tp_ops *tp_ops = hwif->tp_ops;
|
|
struct request_queue *q = drive->queue;
|
|
unsigned long flags;
|
|
int rc;
|
|
#ifdef DEBUG_PM
|
|
printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
|
|
#endif
|
|
rc = ide_wait_not_busy(hwif, 35000);
|
|
if (rc)
|
|
printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
|
|
tp_ops->dev_select(drive);
|
|
tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
|
|
rc = ide_wait_not_busy(hwif, 100000);
|
|
if (rc)
|
|
printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
|
|
|
|
spin_lock_irqsave(q->queue_lock, flags);
|
|
blk_start_queue(q);
|
|
spin_unlock_irqrestore(q->queue_lock, flags);
|
|
}
|
|
}
|