From c0fcbc56d93220c772a524e49ed2612fe5787a98 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= Date: Tue, 21 May 2013 21:03:46 +0200 Subject: [PATCH] mtd: bcm47xxsflash: implement erasing support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Rafał Miłecki Signed-off-by: Brian Norris Signed-off-by: David Woodhouse --- drivers/mtd/devices/bcm47xxsflash.c | 43 +++++++++++++++++++++++++++-- 1 file 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; } /************************************************** -- GitLab