[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>
diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 75d7578..a002d40 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -505,7 +505,7 @@
*
* 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 @@
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 @@
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 @@
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;