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author | Rafał Miłecki <zajec5@gmail.com> | 2013-05-22 14:39:02 +0200 |
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committer | David Woodhouse <David.Woodhouse@intel.com> | 2013-08-30 21:52:20 +0100 |
commit | 13134f48c8a7a9daaef74118d19f2d2ef29cd33a (patch) | |
tree | 2c7af124f82de753a52acfe799e698ec56639e52 /drivers | |
parent | c0fcbc56d93220c772a524e49ed2612fe5787a98 (diff) | |
download | op-kernel-dev-13134f48c8a7a9daaef74118d19f2d2ef29cd33a.zip op-kernel-dev-13134f48c8a7a9daaef74118d19f2d2ef29cd33a.tar.gz |
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>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/mtd/devices/bcm47xxsflash.c | 130 |
1 files changed, 126 insertions, 4 deletions
diff --git a/drivers/mtd/devices/bcm47xxsflash.c b/drivers/mtd/devices/bcm47xxsflash.c index 534cb74..77de29b 100644 --- a/drivers/mtd/devices/bcm47xxsflash.c +++ b/drivers/mtd/devices/bcm47xxsflash.c @@ -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; } /************************************************** |