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[PATCH] OneNAND: Simple Bad Block handling support 

Based on NAND memory bad block table code

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Kyungmin Park 2005-09-03 07:15:48 +01:00 committed by Thomas Gleixner
parent 52b0eea73d
commit cdc001305d
3 changed files with 98 additions and 20 deletions
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4
drivers/mtd/onenand/Makefile
View File

@ -3,7 +3,9 @@
#
# Core functionality.
obj-$(CONFIG_MTD_ONENAND) += onenand_base.o
obj-$(CONFIG_MTD_ONENAND) += onenand.o
# Board specific.
obj-$(CONFIG_MTD_ONENAND_OMAP) += omap-onenand.o
onenand-objs = onenand_base.o onenand_bbt.o

105
drivers/mtd/onenand/onenand_base.c
View File

@ -311,19 +311,21 @@ static int onenand_wait(struct mtd_info *mtd, int state)
ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
if (ctrl & ONENAND_CTRL_ERROR) {
DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: controller error = 0x%04x", ctrl);
return -EIO;
/* It maybe occur at initial bad block */
DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: controller error = 0x%04x\n", ctrl);
/* Clear other interrupt bits for preventing ECC error */
interrupt &= ONENAND_INT_MASTER;
}
if (ctrl & ONENAND_CTRL_LOCK) {
DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: it's locked error = 0x%04x", ctrl);
return -EIO;
DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: it's locked error = 0x%04x\n", ctrl);
return -EACCES;
}
if (interrupt & ONENAND_INT_READ) {
ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
if (ecc & ONENAND_ECC_2BIT_ALL) {
DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: ECC error = 0x%04x", ecc);
DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: ECC error = 0x%04x\n", ecc);
return -EBADMSG;
}
}
@ -1059,6 +1061,25 @@ static int onenand_writev(struct mtd_info *mtd, const struct kvec *vecs,
return onenand_writev_ecc(mtd, vecs, count, to, retlen, NULL, NULL);
}
/**
* onenand_block_checkbad - [GENERIC] Check if a block is marked bad
* @param mtd MTD device structure
* @param ofs offset from device start
* @param getchip 0, if the chip is already selected
* @param allowbbt 1, if its allowed to access the bbt area
*
* Check, if the block is bad. Either by reading the bad block table or
* calling of the scan function.
*/
static int onenand_block_checkbad(struct mtd_info *mtd, loff_t ofs, int getchip, int allowbbt)
{
struct onenand_chip *this = mtd->priv;
struct bbm_info *bbm = this->bbm;
/* Return info from the table */
return bbm->isbad_bbt(mtd, ofs, allowbbt);
}
/**
* onenand_erase - [MTD Interface] erase block(s)
* @param mtd MTD device structure
@ -1109,7 +1130,12 @@ static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
while (len) {
/* TODO Check badblock */
/* Check if we have a bad block, we do not erase bad blocks */
if (onenand_block_checkbad(mtd, addr, 0, 0)) {
printk (KERN_WARNING "onenand_erase: attempt to erase a bad block at addr 0x%08x\n", (unsigned int) addr);
instr->state = MTD_ERASE_FAILED;
goto erase_exit;
}
this->command(mtd, ONENAND_CMD_ERASE, addr, block_size);
@ -1161,34 +1187,70 @@ static void onenand_sync(struct mtd_info *mtd)
onenand_release_device(mtd);
}
/**
* onenand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad
* @param mtd MTD device structure
* @param ofs offset relative to mtd start
*
* Check whether the block is bad
*/
static int onenand_block_isbad(struct mtd_info *mtd, loff_t ofs)
{
/*
* TODO
* 1. Bad block table (BBT)
* -> using NAND BBT to support JFFS2
* 2. Bad block management (BBM)
* -> bad block replace scheme
*
* Currently we do nothing
*/
return 0;
/* Check for invalid offset */
if (ofs > mtd->size)
return -EINVAL;
return onenand_block_checkbad(mtd, ofs, 1, 0);
}
/**
* onenand_default_block_markbad - [DEFAULT] mark a block bad
* @param mtd MTD device structure
* @param ofs offset from device start
*
* This is the default implementation, which can be overridden by
* a hardware specific driver.
*/
static int onenand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
{
struct onenand_chip *this = mtd->priv;
struct bbm_info *bbm = this->bbm;
u_char buf[2] = {0, 0};
size_t retlen;
int block;
/* Get block number */
block = ((int) ofs) >> bbm->bbt_erase_shift;
if (bbm->bbt)
bbm->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
/* We write two bytes, so we dont have to mess with 16 bit access */
ofs += mtd->oobsize + (bbm->badblockpos & ~0x01);
return mtd->write_oob(mtd, ofs , 2, &retlen, buf);
}
/**
* onenand_block_markbad - [MTD Interface] Mark the block at the given offset as bad
* @param mtd MTD device structure
* @param ofs offset relative to mtd start
*
* Mark the block as bad
*/
static int onenand_block_markbad(struct mtd_info *mtd, loff_t ofs)
{
/* see above */
return 0;
struct onenand_chip *this = mtd->priv;
int ret;
ret = onenand_block_isbad(mtd, ofs);
if (ret) {
/* If it was bad already, return success and do nothing */
if (ret > 0)
return 0;
return ret;
}
return this->block_markbad(mtd, ofs);
}
/**
@ -1411,6 +1473,11 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
if (!this->write_bufferram)
this->write_bufferram = onenand_write_bufferram;
if (!this->block_markbad)
this->block_markbad = onenand_default_block_markbad;
if (!this->scan_bbt)
this->scan_bbt = onenand_default_bbt;
if (onenand_probe(mtd))
return -ENXIO;
@ -1472,7 +1539,7 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
/* Unlock whole block */
mtd->unlock(mtd, 0x0, this->chipsize);
return 0;
return this->scan_bbt(mtd);
}
/**

9
include/linux/mtd/onenand.h
View File

@ -14,6 +14,7 @@
#include <linux/spinlock.h>
#include <linux/mtd/onenand_regs.h>
#include <linux/mtd/bbm.h>
#define MAX_BUFFERRAM 2
@ -67,10 +68,14 @@ struct onenand_bufferram {
* @param wait [REPLACEABLE] hardware specific function for wait on ready
* @param read_bufferram [REPLACEABLE] hardware specific function for BufferRAM Area
* @param write_bufferram [REPLACEABLE] hardware specific function for BufferRAM Area
* @param read_word [REPLACEABLE] hardware specific function for read register of OneNAND
* @param write_word [REPLACEABLE] hardware specific function for write register of OneNAND
* @param scan_bbt [REPLACEALBE] hardware specific function for scaning Bad block Table
* @param chip_lock [INTERN] spinlock used to protect access to this structure and the chip
* @param wq [INTERN] wait queue to sleep on if a OneNAND operation is in progress
* @param state [INTERN] the current state of the OneNAND device
* @param autooob [REPLACEABLE] the default (auto)placement scheme
* @param bbm [REPLACEABLE] pointer to Bad Block Management
* @param priv [OPTIONAL] pointer to private chip date
*/
struct onenand_chip {
@ -96,6 +101,8 @@ struct onenand_chip {
unsigned short (*read_word)(void __iomem *addr);
void (*write_word)(unsigned short value, void __iomem *addr);
void (*mmcontrol)(struct mtd_info *mtd, int sync_read);
int (*block_markbad)(struct mtd_info *mtd, loff_t ofs);
int (*scan_bbt)(struct mtd_info *mtd);
spinlock_t chip_lock;
wait_queue_head_t wq;
@ -103,6 +110,8 @@ struct onenand_chip {
struct nand_oobinfo *autooob;
void *bbm;
void *priv;
};