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@@ -0,0 +1,235 @@
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+#include <linux/kernel.h>
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+#include <linux/ide.h>
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+#include <linux/hdreg.h>
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+
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+int generic_ide_suspend(struct device *dev, pm_message_t mesg)
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+{
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+ ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive);
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+ ide_hwif_t *hwif = HWIF(drive);
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+ struct request *rq;
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+ struct request_pm_state rqpm;
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+ ide_task_t args;
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+ int ret;
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+
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+ /* call ACPI _GTM only once */
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+ if ((drive->dn & 1) == 0 || pair == NULL)
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+ ide_acpi_get_timing(hwif);
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+
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+ memset(&rqpm, 0, sizeof(rqpm));
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+ memset(&args, 0, sizeof(args));
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+ rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
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+ rq->cmd_type = REQ_TYPE_PM_SUSPEND;
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+ rq->special = &args;
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+ rq->data = &rqpm;
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+ rqpm.pm_step = IDE_PM_START_SUSPEND;
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+ if (mesg.event == PM_EVENT_PRETHAW)
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+ mesg.event = PM_EVENT_FREEZE;
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+ rqpm.pm_state = mesg.event;
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+
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+ ret = blk_execute_rq(drive->queue, NULL, rq, 0);
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+ blk_put_request(rq);
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+
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+ /* call ACPI _PS3 only after both devices are suspended */
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+ if (ret == 0 && ((drive->dn & 1) || pair == NULL))
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+ ide_acpi_set_state(hwif, 0);
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+
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+ return ret;
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+}
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+
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+int generic_ide_resume(struct device *dev)
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+{
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+ ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive);
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+ ide_hwif_t *hwif = HWIF(drive);
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+ struct request *rq;
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+ struct request_pm_state rqpm;
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+ ide_task_t args;
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+ int err;
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+
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+ /* call ACPI _PS0 / _STM only once */
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+ if ((drive->dn & 1) == 0 || pair == NULL) {
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+ ide_acpi_set_state(hwif, 1);
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+ ide_acpi_push_timing(hwif);
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+ }
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+
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+ ide_acpi_exec_tfs(drive);
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+
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+ memset(&rqpm, 0, sizeof(rqpm));
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+ memset(&args, 0, sizeof(args));
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+ rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
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+ rq->cmd_type = REQ_TYPE_PM_RESUME;
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+ rq->cmd_flags |= REQ_PREEMPT;
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+ rq->special = &args;
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+ rq->data = &rqpm;
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+ rqpm.pm_step = IDE_PM_START_RESUME;
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+ rqpm.pm_state = PM_EVENT_ON;
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+
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+ err = blk_execute_rq(drive->queue, NULL, rq, 1);
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+ blk_put_request(rq);
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+
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+ if (err == 0 && dev->driver) {
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+ ide_driver_t *drv = to_ide_driver(dev->driver);
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+
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+ if (drv->resume)
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+ drv->resume(drive);
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+ }
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+
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+ return err;
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+}
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+
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+void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
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+{
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+ struct request_pm_state *pm = rq->data;
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+
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+#ifdef DEBUG_PM
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+ printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
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+ drive->name, pm->pm_step);
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+#endif
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+ if (drive->media != ide_disk)
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+ return;
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+
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+ switch (pm->pm_step) {
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+ case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
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+ if (pm->pm_state == PM_EVENT_FREEZE)
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+ pm->pm_step = IDE_PM_COMPLETED;
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+ else
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+ pm->pm_step = IDE_PM_STANDBY;
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+ break;
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+ case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
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+ pm->pm_step = IDE_PM_COMPLETED;
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+ break;
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+ case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
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+ pm->pm_step = IDE_PM_IDLE;
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+ break;
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+ case IDE_PM_IDLE: /* Resume step 2 (idle)*/
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+ pm->pm_step = IDE_PM_RESTORE_DMA;
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+ break;
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+ }
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+}
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+
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+ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
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+{
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+ struct request_pm_state *pm = rq->data;
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+ ide_task_t *args = rq->special;
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+
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+ memset(args, 0, sizeof(*args));
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+
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+ switch (pm->pm_step) {
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+ case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
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+ if (drive->media != ide_disk)
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+ break;
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+ /* Not supported? Switch to next step now. */
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+ if (ata_id_flush_enabled(drive->id) == 0 ||
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+ (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
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+ ide_complete_power_step(drive, rq);
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+ return ide_stopped;
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+ }
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+ if (ata_id_flush_ext_enabled(drive->id))
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+ args->tf.command = ATA_CMD_FLUSH_EXT;
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+ else
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+ args->tf.command = ATA_CMD_FLUSH;
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+ goto out_do_tf;
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+ case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
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+ args->tf.command = ATA_CMD_STANDBYNOW1;
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+ goto out_do_tf;
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+ case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
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+ ide_set_max_pio(drive);
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+ /*
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+ * skip IDE_PM_IDLE for ATAPI devices
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+ */
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+ if (drive->media != ide_disk)
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+ pm->pm_step = IDE_PM_RESTORE_DMA;
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+ else
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+ ide_complete_power_step(drive, rq);
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+ return ide_stopped;
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+ case IDE_PM_IDLE: /* Resume step 2 (idle) */
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+ args->tf.command = ATA_CMD_IDLEIMMEDIATE;
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+ goto out_do_tf;
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+ case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */
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+ /*
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+ * Right now, all we do is call ide_set_dma(drive),
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+ * we could be smarter and check for current xfer_speed
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+ * in struct drive etc...
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+ */
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+ if (drive->hwif->dma_ops == NULL)
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+ break;
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+ /*
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+ * TODO: respect IDE_DFLAG_USING_DMA
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+ */
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+ ide_set_dma(drive);
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+ break;
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+ }
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+
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+ pm->pm_step = IDE_PM_COMPLETED;
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+ return ide_stopped;
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+
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+out_do_tf:
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+ args->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
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+ args->data_phase = TASKFILE_NO_DATA;
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+ return do_rw_taskfile(drive, args);
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+}
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+
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+/**
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+ * ide_complete_pm_request - end the current Power Management request
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+ * @drive: target drive
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+ * @rq: request
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+ *
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+ * This function cleans up the current PM request and stops the queue
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+ * if necessary.
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+ */
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+void ide_complete_pm_request(ide_drive_t *drive, struct request *rq)
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+{
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+ struct request_queue *q = drive->queue;
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+ unsigned long flags;
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+
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+#ifdef DEBUG_PM
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+ printk("%s: completing PM request, %s\n", drive->name,
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+ blk_pm_suspend_request(rq) ? "suspend" : "resume");
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+#endif
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+ spin_lock_irqsave(q->queue_lock, flags);
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+ if (blk_pm_suspend_request(rq)) {
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+ blk_stop_queue(q);
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+ } else {
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+ drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
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+ blk_start_queue(q);
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+ }
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+ spin_unlock_irqrestore(q->queue_lock, flags);
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+
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+ drive->hwif->hwgroup->rq = NULL;
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+
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+ if (blk_end_request(rq, 0, 0))
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+ BUG();
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+}
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+
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+void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
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+{
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+ struct request_pm_state *pm = rq->data;
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+
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+ if (blk_pm_suspend_request(rq) &&
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+ pm->pm_step == IDE_PM_START_SUSPEND)
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+ /* Mark drive blocked when starting the suspend sequence. */
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+ drive->dev_flags |= IDE_DFLAG_BLOCKED;
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+ else if (blk_pm_resume_request(rq) &&
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+ pm->pm_step == IDE_PM_START_RESUME) {
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+ /*
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+ * The first thing we do on wakeup is to wait for BSY bit to
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+ * go away (with a looong timeout) as a drive on this hwif may
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+ * just be POSTing itself.
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+ * We do that before even selecting as the "other" device on
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+ * the bus may be broken enough to walk on our toes at this
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+ * point.
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+ */
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+ ide_hwif_t *hwif = drive->hwif;
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+ int rc;
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+#ifdef DEBUG_PM
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+ printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
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+#endif
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+ rc = ide_wait_not_busy(hwif, 35000);
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+ if (rc)
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+ printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
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+ SELECT_DRIVE(drive);
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+ hwif->tp_ops->set_irq(hwif, 1);
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+ rc = ide_wait_not_busy(hwif, 100000);
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+ if (rc)
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+ printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
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+ }
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+}
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Bartlomiej Zolnierkiewicz