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[MTD] m25p80.c erase enhance 

This patch adds an erase_block command to enhance erase operation

Signed-off-by: Chen Gong <g.chen@freescale.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Chen Gong 2008-08-11 16:59:13 +08:00 committed by David Woodhouse
parent d483492cb5
commit faff37508a
1 changed files with 40 additions and 8 deletions
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48
drivers/mtd/devices/m25p80.c
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@ -39,6 +39,7 @@
#define OPCODE_PP 0x02 /* Page program (up to 256 bytes) */
#define OPCODE_BE_4K 0x20 /* Erase 4KiB block */
#define OPCODE_BE_32K 0x52 /* Erase 32KiB block */
#define OPCODE_BE 0xc7 /* Erase whole flash block */
#define OPCODE_SE 0xd8 /* Sector erase (usually 64KiB) */
#define OPCODE_RDID 0x9f /* Read JEDEC ID */
@ -161,6 +162,31 @@ static int wait_till_ready(struct m25p *flash)
return 1;
}
/*
* Erase the whole flash memory
*
* Returns 0 if successful, non-zero otherwise.
*/
static int erase_block(struct m25p *flash)
{
DEBUG(MTD_DEBUG_LEVEL3, "%s: %s %dKiB\n",
flash->spi->dev.bus_id, __func__,
flash->mtd.size / 1024);
/* Wait until finished previous write command. */
if (wait_till_ready(flash))
return 1;
/* Send write enable, then erase commands. */
write_enable(flash);
/* Set up command buffer. */
flash->command[0] = OPCODE_BE;
spi_write(flash->spi, flash->command, 1);
return 0;
}
/*
* Erase one sector of flash memory at offset ``offset'' which is any
@ -229,15 +255,21 @@ static int m25p80_erase(struct mtd_info *mtd, struct erase_info *instr)
*/
/* now erase those sectors */
while (len) {
if (erase_sector(flash, addr)) {
instr->state = MTD_ERASE_FAILED;
mutex_unlock(&flash->lock);
return -EIO;
}
if (len == flash->mtd.size && erase_block(flash)) {
instr->state = MTD_ERASE_FAILED;
mutex_unlock(&flash->lock);
return -EIO;
} else {
while (len) {
if (erase_sector(flash, addr)) {
instr->state = MTD_ERASE_FAILED;
mutex_unlock(&flash->lock);
return -EIO;
}
addr += mtd->erasesize;
len -= mtd->erasesize;
addr += mtd->erasesize;
len -= mtd->erasesize;
}
}
mutex_unlock(&flash->lock);