sysmo-bts
/
u-boot
9
0
Fork 0
Code Pull Requests Releases Activity

sf: macronix: disable write protection when initializing 

Signed-off-by: Simon Guinot <sguinot@lacie.com>
This commit is contained in:
Simon Guinot 2011-05-02 11:01:38 +00:00 committed by Wolfgang Denk
parent 9445ce0873
commit 7432ed05a3
1 changed files with 42 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
drivers/mtd/spi/macronix.c
View File

@ -117,6 +117,45 @@ static const struct macronix_spi_flash_params macronix_spi_flash_table[] = {
},
};
static int macronix_write_status(struct spi_flash *flash, u8 sr)
{
u8 cmd;
int ret;
ret = spi_flash_cmd_write_enable(flash);
if (ret < 0) {
debug("SF: enabling write failed\n");
return ret;
}
cmd = CMD_MX25XX_WRSR;
ret = spi_flash_cmd_write(flash->spi, &cmd, 1, &sr, 1);
if (ret) {
debug("SF: fail to write status register\n");
return ret;
}
ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
if (ret < 0) {
debug("SF: write status register timed out\n");
return ret;
}
return 0;
}
static int macronix_unlock(struct spi_flash *flash)
{
int ret;
/* Enable status register writing and clear BP# bits */
ret = macronix_write_status(flash, 0);
if (ret)
debug("SF: fail to disable write protection\n");
return ret;
}
static int macronix_erase(struct spi_flash *flash, u32 offset, size_t len)
{
return spi_flash_cmd_erase(flash, CMD_MX25XX_BE, offset, len);
@ -157,5 +196,8 @@ struct spi_flash *spi_flash_probe_macronix(struct spi_slave *spi, u8 *idcode)
* params->sectors_per_block;
flash->size = flash->sector_size * params->nr_blocks;
/* Clear BP# bits for read-only flash */
macronix_unlock(flash);
return flash;
}