drivers/ide/ide-pm.c - kernel/prism - Git at Google

 #include <linux/kernel.h>
 #include <linux/ide.h>

 int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 {
 	ide_drive_t *drive = dev_get_drvdata(dev);
 	ide_drive_t *pair = ide_get_pair_dev(drive);
 	ide_hwif_t *hwif = drive->hwif;
 	struct request *rq;
 	struct request_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_WAIT);
 	rq->cmd_type = REQ_TYPE_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;
 }

 int generic_ide_resume(struct device *dev)
 {
 	ide_drive_t *drive = dev_get_drvdata(dev);
 	ide_drive_t *pair = ide_get_pair_dev(drive);
 	ide_hwif_t *hwif = drive->hwif;
 	struct request *rq;
 	struct request_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_WAIT);
 	rq->cmd_type = REQ_TYPE_PM_RESUME;
 	rq->cmd_flags |= REQ_PREEMPT;
 	rq->special = &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) {
 		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 request_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 request_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 request_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,
 	       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;
 	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 request_pm_state *pm = rq->special;

 	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;
 		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);
 	}
 }
	#include <linux/kernel.h>
	#include <linux/ide.h>

	int generic_ide_suspend(struct device *dev, pm_message_t mesg)
	{
	ide_drive_t *drive = dev_get_drvdata(dev);
	ide_drive_t *pair = ide_get_pair_dev(drive);
	ide_hwif_t *hwif = drive->hwif;
	struct request *rq;
	struct request_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_WAIT);
	rq->cmd_type = REQ_TYPE_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;
	}

	int generic_ide_resume(struct device *dev)
	{
	ide_drive_t *drive = dev_get_drvdata(dev);
	ide_drive_t *pair = ide_get_pair_dev(drive);
	ide_hwif_t *hwif = drive->hwif;
	struct request *rq;
	struct request_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_WAIT);
	rq->cmd_type = REQ_TYPE_PM_RESUME;
	rq->cmd_flags \|= REQ_PREEMPT;
	rq->special = &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) {
	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 request_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 request_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 request_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,
	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;
	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 request_pm_state *pm = rq->special;

	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;
	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);
	}
	}