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[MTD] OneNAND: Power Management (PM) support

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Add suspend/resume

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Kyungmin Park 2005-09-29 03:55:31 +01:00 committed by Thomas Gleixner
parent d55849aa4d
commit a41371eb6d
2 changed files with 34 additions and 3 deletions
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36
drivers/mtd/onenand/onenand_base.c
View File

@ -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;

1
include/linux/mtd/onenand.h
View File

@ -36,6 +36,7 @@ typedef enum {
FL_SYNCING,
FL_UNLOCKING,
FL_LOCKING,
FL_PM_SUSPENDED,
} onenand_state_t;
/**