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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
Subject: [PATCH] mtd: bcm47xxsflash: implement erasing support
Date: Tue, 21 May 2013 21:03:46 +0200
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
---
This has been succesfully tested on BCM4706.
---
drivers/mtd/devices/bcm47xxsflash.c | 43 +++++++++++++++++++++++++++++++++--
1 file changed, 41 insertions(+), 2 deletions(-)
--- a/drivers/mtd/devices/bcm47xxsflash.c
+++ b/drivers/mtd/devices/bcm47xxsflash.c
@@ -64,6 +64,42 @@ static int bcm47xxsflash_poll(struct bcm
* 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(struc
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;
}
/**************************************************
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