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path: root/drivers/ide/ide-pm.c
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Diffstat (limited to 'drivers/ide/ide-pm.c')
-rw-r--r--drivers/ide/ide-pm.c235
1 files changed, 235 insertions, 0 deletions
diff --git a/drivers/ide/ide-pm.c b/drivers/ide/ide-pm.c
new file mode 100644
index 00000000000..8282c6086e6
--- /dev/null
+++ b/drivers/ide/ide-pm.c
@@ -0,0 +1,235 @@
+#include <linux/kernel.h>
+#include <linux/ide.h>
+#include <linux/hdreg.h>
+
+int generic_ide_suspend(struct device *dev, pm_message_t mesg)
+{
+ ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive);
+ ide_hwif_t *hwif = HWIF(drive);
+ struct request *rq;
+ struct request_pm_state rqpm;
+ ide_task_t args;
+ int ret;
+
+ /* call ACPI _GTM only once */
+ if ((drive->dn & 1) == 0 || pair == NULL)
+ ide_acpi_get_timing(hwif);
+
+ memset(&rqpm, 0, sizeof(rqpm));
+ memset(&args, 0, sizeof(args));
+ rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
+ rq->cmd_type = REQ_TYPE_PM_SUSPEND;
+ rq->special = &args;
+ rq->data = &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);
+
+ /* call ACPI _PS3 only after both devices are suspended */
+ if (ret == 0 && ((drive->dn & 1) || pair == NULL))
+ ide_acpi_set_state(hwif, 0);
+
+ return ret;
+}
+
+int generic_ide_resume(struct device *dev)
+{
+ ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive);
+ ide_hwif_t *hwif = HWIF(drive);
+ struct request *rq;
+ struct request_pm_state rqpm;
+ ide_task_t args;
+ int err;
+
+ /* 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));
+ memset(&args, 0, sizeof(args));
+ rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
+ rq->cmd_type = REQ_TYPE_PM_RESUME;
+ rq->cmd_flags |= REQ_PREEMPT;
+ rq->special = &args;
+ rq->data = &rqpm;
+ rqpm.pm_step = IDE_PM_START_RESUME;
+ rqpm.pm_state = PM_EVENT_ON;
+
+ err = blk_execute_rq(drive->queue, NULL, rq, 1);
+ blk_put_request(rq);
+
+ if (err == 0 && dev->driver) {
+ ide_driver_t *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 request_pm_state *pm = rq->data;
+
+#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 request_pm_state *pm = rq->data;
+ ide_task_t *args = rq->special;
+
+ memset(args, 0, sizeof(*args));
+
+ 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))
+ args->tf.command = ATA_CMD_FLUSH_EXT;
+ else
+ args->tf.command = ATA_CMD_FLUSH;
+ goto out_do_tf;
+ case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
+ args->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) */
+ args->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:
+ args->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
+ args->data_phase = TASKFILE_NO_DATA;
+ return do_rw_taskfile(drive, args);
+}
+
+/**
+ * ide_complete_pm_request - 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_request(ide_drive_t *drive, struct request *rq)
+{
+ struct request_queue *q = drive->queue;
+ unsigned long flags;
+
+#ifdef DEBUG_PM
+ printk("%s: completing PM request, %s\n", drive->name,
+ blk_pm_suspend_request(rq) ? "suspend" : "resume");
+#endif
+ spin_lock_irqsave(q->queue_lock, flags);
+ if (blk_pm_suspend_request(rq)) {
+ blk_stop_queue(q);
+ } else {
+ drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
+ blk_start_queue(q);
+ }
+ spin_unlock_irqrestore(q->queue_lock, flags);
+
+ drive->hwif->hwgroup->rq = NULL;
+
+ if (blk_end_request(rq, 0, 0))
+ BUG();
+}
+
+void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
+{
+ struct request_pm_state *pm = rq->data;
+
+ if (blk_pm_suspend_request(rq) &&
+ pm->pm_step == IDE_PM_START_SUSPEND)
+ /* Mark drive blocked when starting the suspend sequence. */
+ drive->dev_flags |= IDE_DFLAG_BLOCKED;
+ else if (blk_pm_resume_request(rq) &&
+ 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;
+ 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);
+ SELECT_DRIVE(drive);
+ hwif->tp_ops->set_irq(hwif, 1);
+ rc = ide_wait_not_busy(hwif, 100000);
+ if (rc)
+ printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
+ }
+}
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