diff options
Diffstat (limited to 'drivers/mtd')
-rw-r--r-- | drivers/mtd/nand/nand_base.c | 46 |
1 files changed, 40 insertions, 6 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index cdf1086..4e22317 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -46,6 +46,8 @@ * perform extra error status checks on erase and write failures. This required * adding a wrapper function for nand_read_ecc. * + * 08-20-2005 vwool: suspend/resume added + * * Credits: * David Woodhouse for adding multichip support * @@ -59,7 +61,7 @@ * The AG-AND chips have nice features for speed improvement, * which are not supported yet. Read / program 4 pages in one go. * - * $Id: nand_base.c,v 1.148 2005/08/04 17:14:48 gleixner Exp $ + * $Id: nand_base.c,v 1.150 2005/09/15 13:58:48 vwool Exp $ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as @@ -153,7 +155,7 @@ static int nand_verify_pages (struct mtd_info *mtd, struct nand_chip *this, int #define nand_verify_pages(...) (0) #endif -static void nand_get_device (struct nand_chip *this, struct mtd_info *mtd, int new_state); +static int nand_get_device (struct nand_chip *this, struct mtd_info *mtd, int new_state); /** * nand_release_device - [GENERIC] release chip @@ -756,7 +758,7 @@ static void nand_command_lp (struct mtd_info *mtd, unsigned command, int column, * * Get the device and lock it for exclusive access */ -static void nand_get_device (struct nand_chip *this, struct mtd_info *mtd, int new_state) +static int nand_get_device (struct nand_chip *this, struct mtd_info *mtd, int new_state) { struct nand_chip *active; spinlock_t *lock; @@ -779,7 +781,11 @@ retry: if (active == this && this->state == FL_READY) { this->state = new_state; spin_unlock(lock); - return; + return 0; + } + if (new_state == FL_PM_SUSPENDED) { + spin_unlock(lock); + return (this->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN; } set_current_state(TASK_UNINTERRUPTIBLE); add_wait_queue(wq, &wait); @@ -2285,6 +2291,34 @@ static int nand_block_markbad (struct mtd_info *mtd, loff_t ofs) } /** + * nand_suspend - [MTD Interface] Suspend the NAND flash + * @mtd: MTD device structure + */ +static int nand_suspend(struct mtd_info *mtd) +{ + struct nand_chip *this = mtd->priv; + + return nand_get_device (this, mtd, FL_PM_SUSPENDED); +} + +/** + * nand_resume - [MTD Interface] Resume the NAND flash + * @mtd: MTD device structure + */ +static void nand_resume(struct mtd_info *mtd) +{ + struct nand_chip *this = mtd->priv; + + if (this->state == FL_PM_SUSPENDED) + nand_release_device(mtd); + else + printk(KERN_ERR "resume() called for the chip which is not " + "in suspended state\n"); + +} + + +/** * nand_scan - [NAND Interface] Scan for the NAND device * @mtd: MTD device structure * @maxchips: Number of chips to scan for @@ -2643,8 +2677,8 @@ int nand_scan (struct mtd_info *mtd, int maxchips) mtd->sync = nand_sync; mtd->lock = NULL; mtd->unlock = NULL; - mtd->suspend = NULL; - mtd->resume = NULL; + mtd->suspend = nand_suspend; + mtd->resume = nand_resume; mtd->block_isbad = nand_block_isbad; mtd->block_markbad = nand_block_markbad; |