You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
74 lines
2.2 KiB
74 lines
2.2 KiB
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;
|
|
}
|
|
|
|
/**************************************************
|
|
|