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mtd: bcm47xxsflash: writing support 

Tested with BCM4706.

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 2013-05-22 14:39:02 +02:00 committed by David Woodhouse
parent c0fcbc56d9
commit 13134f48c8
1 changed files with 126 additions and 4 deletions
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130
drivers/mtd/devices/bcm47xxsflash.c
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@ -116,6 +116,127 @@ static int bcm47xxsflash_read(struct mtd_info *mtd, loff_t from, size_t len,
return len;
}
static int bcm47xxsflash_write_st(struct mtd_info *mtd, u32 offset, size_t len,
const u_char *buf)
{
struct bcm47xxsflash *b47s = mtd->priv;
int written = 0;
/* Enable writes */
bcm47xxsflash_cmd(b47s, OPCODE_ST_WREN);
/* Write first byte */
b47s->cc_write(b47s, BCMA_CC_FLASHADDR, offset);
b47s->cc_write(b47s, BCMA_CC_FLASHDATA, *buf++);
/* Program page */
if (b47s->bcma_cc->core->id.rev < 20) {
bcm47xxsflash_cmd(b47s, OPCODE_ST_PP);
return 1; /* 1B written */
}
/* Program page and set CSA (on newer chips we can continue writing) */
bcm47xxsflash_cmd(b47s, OPCODE_ST_CSA | OPCODE_ST_PP);
offset++;
len--;
written++;
while (len > 0) {
/* Page boundary, another function call is needed */
if ((offset & 0xFF) == 0)
break;
bcm47xxsflash_cmd(b47s, OPCODE_ST_CSA | *buf++);
offset++;
len--;
written++;
}
/* All done, drop CSA & poll */
b47s->cc_write(b47s, BCMA_CC_FLASHCTL, 0);
udelay(1);
if (bcm47xxsflash_poll(b47s, HZ / 10))
pr_err("Flash rejected dropping CSA\n");
return written;
}
static int bcm47xxsflash_write_at(struct mtd_info *mtd, u32 offset, size_t len,
const u_char *buf)
{
struct bcm47xxsflash *b47s = mtd->priv;
u32 mask = b47s->blocksize - 1;
u32 page = (offset & ~mask) << 1;
u32 byte = offset & mask;
int written = 0;
/* If we don't overwrite whole page, read it to the buffer first */
if (byte || (len < b47s->blocksize)) {
int err;
b47s->cc_write(b47s, BCMA_CC_FLASHADDR, page);
bcm47xxsflash_cmd(b47s, OPCODE_AT_BUF1_LOAD);
/* 250 us for AT45DB321B */
err = bcm47xxsflash_poll(b47s, HZ / 1000);
if (err) {
pr_err("Timeout reading page 0x%X info buffer\n", page);
return err;
}
}
/* Change buffer content with our data */
while (len > 0) {
/* Page boundary, another function call is needed */
if (byte == b47s->blocksize)
break;
b47s->cc_write(b47s, BCMA_CC_FLASHADDR, byte++);
b47s->cc_write(b47s, BCMA_CC_FLASHDATA, *buf++);
bcm47xxsflash_cmd(b47s, OPCODE_AT_BUF1_WRITE);
len--;
written++;
}
/* Program page with the buffer content */
b47s->cc_write(b47s, BCMA_CC_FLASHADDR, page);
bcm47xxsflash_cmd(b47s, OPCODE_AT_BUF1_PROGRAM);
return written;
}
static int bcm47xxsflash_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf)
{
struct bcm47xxsflash *b47s = mtd->priv;
int written;
/* Writing functions can return without writing all passed data, for
* example when the hardware is too old or when we git page boundary.
*/
while (len > 0) {
switch (b47s->type) {
case BCM47XXSFLASH_TYPE_ST:
written = bcm47xxsflash_write_st(mtd, to, len, buf);
break;
case BCM47XXSFLASH_TYPE_ATMEL:
written = bcm47xxsflash_write_at(mtd, to, len, buf);
break;
default:
BUG_ON(1);
}
if (written < 0) {
pr_err("Error writing at offset 0x%llX\n", to);
return written;
}
to += (loff_t)written;
len -= written;
*retlen += written;
buf += written;
}
return 0;
}
static void bcm47xxsflash_fill_mtd(struct bcm47xxsflash *b47s)
{
struct mtd_info *mtd = &b47s->mtd;
@ -123,16 +244,17 @@ static void bcm47xxsflash_fill_mtd(struct bcm47xxsflash *b47s)
mtd->priv = b47s;
mtd->name = "bcm47xxsflash";
mtd->owner = THIS_MODULE;
mtd->type = MTD_ROM;
/* TODO: implement writing support and verify/change following code */
mtd->flags = MTD_CAP_ROM;
mtd->type = MTD_NORFLASH;
mtd->flags = MTD_CAP_NORFLASH;
mtd->size = b47s->size;
mtd->erasesize = b47s->blocksize;
mtd->writebufsize = mtd->writesize = 1;
mtd->writesize = 1;
mtd->writebufsize = 1;
mtd->_erase = bcm47xxsflash_erase;
mtd->_read = bcm47xxsflash_read;
mtd->_write = bcm47xxsflash_write;
}
/**************************************************