diff options
| author | Rafał Miłecki <zajec5@gmail.com> | 2013-05-21 21:03:46 +0200 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2013-08-30 21:52:15 +0100 |
| commit | c0fcbc56d93220c772a524e49ed2612fe5787a98 (patch) | |
| tree | f73c08952c144ed89118e8f92f083459aa991d39 /drivers | |
| parent | 8268df26369f7779d3394ec066d72cc00232efe1 (diff) | |
| download | linux-c0fcbc56d93220c772a524e49ed2612fe5787a98.tar.bz2 | |
mtd: bcm47xxsflash: implement erasing support
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mtd/devices/bcm47xxsflash.c | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/drivers/mtd/devices/bcm47xxsflash.c b/drivers/mtd/devices/bcm47xxsflash.c index e9e38877a571..534cb741b107 100644 --- a/drivers/mtd/devices/bcm47xxsflash.c +++ b/drivers/mtd/devices/bcm47xxsflash.c @@ -64,6 +64,42 @@ static int bcm47xxsflash_poll(struct bcm47xxsflash *b47s, int timeout) * MTD ops **************************************************/ +static int bcm47xxsflash_erase(struct mtd_info *mtd, struct erase_info *erase) +{ + struct bcm47xxsflash *b47s = mtd->priv; + int err; + + switch (b47s->type) { + case BCM47XXSFLASH_TYPE_ST: + bcm47xxsflash_cmd(b47s, OPCODE_ST_WREN); + b47s->cc_write(b47s, BCMA_CC_FLASHADDR, erase->addr); + /* Newer flashes have "sub-sectors" which can be erased + * independently with a new command: ST_SSE. The ST_SE command + * erases 64KB just as before. + */ + if (b47s->blocksize < (64 * 1024)) + bcm47xxsflash_cmd(b47s, OPCODE_ST_SSE); + else + bcm47xxsflash_cmd(b47s, OPCODE_ST_SE); + break; + case BCM47XXSFLASH_TYPE_ATMEL: + b47s->cc_write(b47s, BCMA_CC_FLASHADDR, erase->addr << 1); + bcm47xxsflash_cmd(b47s, OPCODE_AT_PAGE_ERASE); + break; + } + + err = bcm47xxsflash_poll(b47s, HZ); + if (err) + erase->state = MTD_ERASE_FAILED; + else + erase->state = MTD_ERASE_DONE; + + if (erase->callback) + erase->callback(erase); + + return err; +} + static int bcm47xxsflash_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { @@ -88,12 +124,15 @@ static void bcm47xxsflash_fill_mtd(struct bcm47xxsflash *b47s) mtd->name = "bcm47xxsflash"; mtd->owner = THIS_MODULE; mtd->type = MTD_ROM; - mtd->size = b47s->size; - mtd->_read = bcm47xxsflash_read; /* TODO: implement writing support and verify/change following code */ mtd->flags = MTD_CAP_ROM; + mtd->size = b47s->size; + mtd->erasesize = b47s->blocksize; mtd->writebufsize = mtd->writesize = 1; + + mtd->_erase = bcm47xxsflash_erase; + mtd->_read = bcm47xxsflash_read; } /************************************************** |