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247 lines
6.5 KiB
247 lines
6.5 KiB
#include <linux/kernel.h>
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#include <linux/ide.h>
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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 = drive->hwif;
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struct request *rq;
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struct request_pm_state rqpm;
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struct ide_cmd cmd;
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int ret;
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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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memset(&rqpm, 0, sizeof(rqpm));
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memset(&cmd, 0, sizeof(cmd));
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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 = &cmd;
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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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ret = blk_execute_rq(drive->queue, NULL, rq, 0);
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blk_put_request(rq);
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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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return ret;
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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 = drive->hwif;
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struct request *rq;
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struct request_pm_state rqpm;
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struct ide_cmd cmd;
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int err;
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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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ide_acpi_exec_tfs(drive);
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memset(&rqpm, 0, sizeof(rqpm));
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memset(&cmd, 0, sizeof(cmd));
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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 = &cmd;
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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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err = blk_execute_rq(drive->queue, NULL, rq, 1);
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blk_put_request(rq);
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if (err == 0 && dev->driver) {
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struct ide_driver *drv = to_ide_driver(dev->driver);
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if (drv->resume)
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drv->resume(drive);
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}
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return err;
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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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#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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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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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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struct ide_cmd *cmd = rq->special;
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memset(cmd, 0, sizeof(*cmd));
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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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cmd->tf.command = ATA_CMD_FLUSH_EXT;
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else
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cmd->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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cmd->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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cmd->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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pm->pm_step = IDE_PM_COMPLETED;
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return ide_stopped;
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out_do_tf:
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cmd->valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
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cmd->valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
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cmd->protocol = ATA_PROT_NODATA;
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return do_rw_taskfile(drive, cmd);
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}
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/**
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* ide_complete_pm_rq - 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_rq(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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struct request_pm_state *pm = rq->data;
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unsigned long flags;
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ide_complete_power_step(drive, rq);
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if (pm->pm_step != IDE_PM_COMPLETED)
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return;
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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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spin_unlock_irqrestore(q->queue_lock, flags);
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drive->hwif->rq = NULL;
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if (blk_end_request(rq, 0, 0))
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BUG();
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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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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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const struct ide_tp_ops *tp_ops = hwif->tp_ops;
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struct request_queue *q = drive->queue;
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unsigned long flags;
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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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tp_ops->dev_select(drive);
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tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
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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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spin_lock_irqsave(q->queue_lock, flags);
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blk_start_queue(q);
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spin_unlock_irqrestore(q->queue_lock, flags);
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}
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}
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