ide: move Power Management support to ide-pm.c

There should be no functional changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

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 000000000000..8282c6086e6a
--- /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);
+        }
+}