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Commit a41371eb authored by Kyungmin Park's avatar Kyungmin Park Committed by Thomas Gleixner
Browse files

[MTD] OneNAND: Power Management (PM) support 



Add suspend/resume

Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent d55849aa

drivers/mtd/onenand/onenand_base.c

+33 −3
Original line number Diff line number Diff line
@@ -505,7 +505,7 @@ static int onenand_update_bufferram(struct mtd_info *mtd, loff_t addr, 
 *

 * Get the device and lock it for exclusive access

 */

static void onenand_get_device(struct mtd_info *mtd, int new_state)

static int onenand_get_device(struct mtd_info *mtd, int new_state)

{

	struct onenand_chip *this = mtd->priv;

	DECLARE_WAITQUEUE(wait, current);
@@ -520,12 +520,18 @@ static void onenand_get_device(struct mtd_info *mtd, int new_state) 
			spin_unlock(&this->chip_lock);

			break;

		}

		if (new_state == FL_PM_SUSPENDED) {

			spin_unlock(&this->chip_lock);

			return (this->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN;

		}

		set_current_state(TASK_UNINTERRUPTIBLE);

		add_wait_queue(&this->wq, &wait);

		spin_unlock(&this->chip_lock);

		schedule();

		remove_wait_queue(&this->wq, &wait);

	}



	return 0;

}



/**
@@ -1440,6 +1446,30 @@ static int onenand_probe(struct mtd_info *mtd) 
	return 0;

}



/**

 * onenand_suspend - [MTD Interface] Suspend the OneNAND flash

 * @param mtd		MTD device structure

 */

static int onenand_suspend(struct mtd_info *mtd)

{

	return onenand_get_device(mtd, FL_PM_SUSPENDED);

}



/**

 * onenand_resume - [MTD Interface] Resume the OneNAND flash

 * @param mtd		MTD device structure

 */

static void onenand_resume(struct mtd_info *mtd)

{

	struct onenand_chip *this = mtd->priv;



	if (this->state == FL_PM_SUSPENDED)

		onenand_release_device(mtd);

	else

		printk(KERN_ERR "resume() called for the chip which is not"

				"in suspended state\n");

}





/**

 * onenand_scan - [OneNAND Interface] Scan for the OneNAND device
@@ -1527,8 +1557,8 @@ int onenand_scan(struct mtd_info *mtd, int maxchips) 
	mtd->sync = onenand_sync;

	mtd->lock = NULL;

	mtd->unlock = onenand_unlock;

	mtd->suspend = NULL;

	mtd->resume = NULL;

	mtd->suspend = onenand_suspend;

	mtd->resume = onenand_resume;

	mtd->block_isbad = onenand_block_isbad;

	mtd->block_markbad = onenand_block_markbad;

	mtd->owner = THIS_MODULE;

include/linux/mtd/onenand.h

+1 −0
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ typedef enum { 
	FL_SYNCING,

	FL_UNLOCKING,

	FL_LOCKING,

	FL_PM_SUSPENDED,

} onenand_state_t;



/**