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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>
This commit is contained in:
Rafał Miłecki 2013-05-21 21:03:46 +02:00 committed by David Woodhouse
parent 8268df2636
commit c0fcbc56d9
1 changed files with 41 additions and 2 deletions
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43
drivers/mtd/devices/bcm47xxsflash.c
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@ -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;
}
/**************************************************