Helper functions for mtd_write_oob() and mtd_write_oob(). Handles multi-page transfers and mapping between BCH sectors and MTD page+OOB data.
Signed-off-by: Lee Jones <[email protected]> --- drivers/mtd/nand/stm_nand_bch.c | 136 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 136 insertions(+) diff --git a/drivers/mtd/nand/stm_nand_bch.c b/drivers/mtd/nand/stm_nand_bch.c index 18601e5..75c5c9b 100644 --- a/drivers/mtd/nand/stm_nand_bch.c +++ b/drivers/mtd/nand/stm_nand_bch.c @@ -1082,6 +1082,142 @@ static int bch_load_bbt(struct nandi_controller *nandi, return 0; } +/* + * Helper function for mtd_read_oob(): handles multi-page transfers + * and mapping between BCH sectors and MTD page+OOB data. + */ +static int flex_do_read_ops(struct nandi_controller *nandi, + loff_t from, + struct mtd_oob_ops *ops) +{ + struct mtd_info *mtd = &nandi->info.mtd; + uint32_t page_addr = from >> nandi->page_shift; + uint32_t oob_remainder; + uint8_t *oobbuf = ops->oobbuf; + uint8_t *datbuf = ops->datbuf; + uint8_t *page_buf; + int ecc_size; + int pages; + int s; + + ecc_size = bch_ecc_sizes[nandi->bch_ecc_mode]; + nandi->cached_page = -1; + + pages = ops->datbuf ? + (ops->len >> nandi->page_shift) : + (ops->ooblen / mtd->oobsize); + + oob_remainder = mtd->oobsize - (nandi->sectors_per_page * ecc_size); + + while (pages) { + page_buf = nandi->page_buf; + + flex_read_raw(nandi, page_addr, 0, page_buf, + mtd->writesize + mtd->oobsize); + + for (s = 0; s < nandi->sectors_per_page; s++) { + if (datbuf) { + memcpy(datbuf, page_buf, NANDI_BCH_SECTOR_SIZE); + datbuf += NANDI_BCH_SECTOR_SIZE; + ops->retlen += NANDI_BCH_SECTOR_SIZE; + } + page_buf += NANDI_BCH_SECTOR_SIZE; + + if (oobbuf) { + memcpy(oobbuf, page_buf, ecc_size); + ops->oobretlen += ecc_size; + oobbuf += ecc_size; + } + page_buf += ecc_size; + } + + if (oob_remainder && oobbuf) { + memcpy(oobbuf, page_buf, oob_remainder); + oobbuf += oob_remainder; + ops->oobretlen += oob_remainder; + } + + page_addr++; + pages--; + } + + return 0; +} + +/* + * Helper function for mtd_write_oob(): handles multi-page transfers + * and mapping between BCH sectors and MTD page+OOB data. +*/ +static int flex_do_write_ops(struct nandi_controller *nandi, + loff_t to, + struct mtd_oob_ops *ops) +{ + struct mtd_info *mtd = &nandi->info.mtd; + uint32_t page_addr = to >> nandi->page_shift; + uint32_t oob_remainder; + uint8_t *oobbuf = ops->oobbuf; + uint8_t *datbuf = ops->datbuf; + uint8_t *page_buf; + uint8_t status; + int ecc_size; + int pages; + int s; + + ecc_size = bch_ecc_sizes[nandi->bch_ecc_mode]; + nandi->cached_page = -1; + + pages = ops->datbuf ? + (ops->len >> nandi->page_shift) : + (ops->ooblen / mtd->oobsize); + + oob_remainder = mtd->oobsize - (nandi->sectors_per_page * ecc_size); + + while (pages) { + page_buf = nandi->page_buf; + + for (s = 0; s < nandi->sectors_per_page; s++) { + if (datbuf) { + memcpy(page_buf, datbuf, NANDI_BCH_SECTOR_SIZE); + datbuf += NANDI_BCH_SECTOR_SIZE; + ops->retlen += NANDI_BCH_SECTOR_SIZE; + } else { + memset(page_buf, 0xff, NANDI_BCH_SECTOR_SIZE); + } + page_buf += NANDI_BCH_SECTOR_SIZE; + + if (oobbuf) { + memcpy(page_buf, oobbuf, ecc_size); + oobbuf += ecc_size; + ops->oobretlen += ecc_size; + } else { + memset(page_buf, 0xff, ecc_size); + } + page_buf += ecc_size; + } + + if (oob_remainder) { + if (oobbuf) { + memcpy(page_buf, oobbuf, oob_remainder); + oobbuf += oob_remainder; + ops->oobretlen += oob_remainder; + } else { + memset(page_buf, 0xff, oob_remainder); + } + } + + status = flex_write_raw(nandi, page_addr, 0, nandi->page_buf, + mtd->writesize + mtd->oobsize); + + if (status & NAND_STATUS_FAIL) + return -EIO; + + page_addr++; + pages--; + } + + return 0; +} + static void nandi_dump_bad_blocks(struct nandi_controller *nandi) { int bad_count = 0; -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
