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authorKyungmin Park <kyungmin.park@samsung.com>2005-09-29 03:55:31 +0100
committerThomas Gleixner <tglx@mtd.linutronix.de>2005-11-06 22:42:28 +0100
commita41371eb6d9b368e53867cd85156f07371e9f72f (patch)
tree962ef7c7222e0790294548564254022911c239ad
parentd55849aa4d219b734795862692cc6981af848357 (diff)
[MTD] OneNAND: Power Management (PM) support
Add suspend/resume Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--drivers/mtd/onenand/onenand_base.c36
-rw-r--r--include/linux/mtd/onenand.h1
2 files changed, 34 insertions, 3 deletions
diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 75d75788269..a002d4025b2 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -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;
diff --git a/include/linux/mtd/onenand.h b/include/linux/mtd/onenand.h
index 58023082320..afaa6342aa7 100644
--- a/include/linux/mtd/onenand.h
+++ b/include/linux/mtd/onenand.h
@@ -36,6 +36,7 @@ typedef enum {
FL_SYNCING,
FL_UNLOCKING,
FL_LOCKING,
+ FL_PM_SUSPENDED,
} onenand_state_t;
/**