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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>
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8268df2636
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c0fcbc56d9
1 changed files with 41 additions and 2 deletions
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@ -64,6 +64,42 @@ static int bcm47xxsflash_poll(struct bcm47xxsflash *b47s, int timeout)
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* MTD ops
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**************************************************/
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static int bcm47xxsflash_erase(struct mtd_info *mtd, struct erase_info *erase)
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{
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struct bcm47xxsflash *b47s = mtd->priv;
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int err;
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switch (b47s->type) {
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case BCM47XXSFLASH_TYPE_ST:
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bcm47xxsflash_cmd(b47s, OPCODE_ST_WREN);
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b47s->cc_write(b47s, BCMA_CC_FLASHADDR, erase->addr);
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/* Newer flashes have "sub-sectors" which can be erased
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* independently with a new command: ST_SSE. The ST_SE command
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* erases 64KB just as before.
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*/
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if (b47s->blocksize < (64 * 1024))
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bcm47xxsflash_cmd(b47s, OPCODE_ST_SSE);
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else
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bcm47xxsflash_cmd(b47s, OPCODE_ST_SE);
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break;
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case BCM47XXSFLASH_TYPE_ATMEL:
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b47s->cc_write(b47s, BCMA_CC_FLASHADDR, erase->addr << 1);
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bcm47xxsflash_cmd(b47s, OPCODE_AT_PAGE_ERASE);
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break;
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}
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err = bcm47xxsflash_poll(b47s, HZ);
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if (err)
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erase->state = MTD_ERASE_FAILED;
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else
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erase->state = MTD_ERASE_DONE;
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if (erase->callback)
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erase->callback(erase);
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return err;
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}
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static int bcm47xxsflash_read(struct mtd_info *mtd, loff_t from, size_t len,
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size_t *retlen, u_char *buf)
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{
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@ -88,12 +124,15 @@ static void bcm47xxsflash_fill_mtd(struct bcm47xxsflash *b47s)
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mtd->name = "bcm47xxsflash";
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mtd->owner = THIS_MODULE;
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mtd->type = MTD_ROM;
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mtd->size = b47s->size;
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mtd->_read = bcm47xxsflash_read;
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/* TODO: implement writing support and verify/change following code */
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mtd->flags = MTD_CAP_ROM;
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mtd->size = b47s->size;
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mtd->erasesize = b47s->blocksize;
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mtd->writebufsize = mtd->writesize = 1;
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mtd->_erase = bcm47xxsflash_erase;
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mtd->_read = bcm47xxsflash_read;
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}
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/**************************************************
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