diff options
Diffstat (limited to 'target/linux/xburst/patches-3.10/003-NAND-Add-support-for-subpage-reads-for-NAND_ECC_HW_O.patch')
-rw-r--r-- | target/linux/xburst/patches-3.10/003-NAND-Add-support-for-subpage-reads-for-NAND_ECC_HW_O.patch | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/target/linux/xburst/patches-3.10/003-NAND-Add-support-for-subpage-reads-for-NAND_ECC_HW_O.patch b/target/linux/xburst/patches-3.10/003-NAND-Add-support-for-subpage-reads-for-NAND_ECC_HW_O.patch new file mode 100644 index 0000000..2e67ad9 --- /dev/null +++ b/target/linux/xburst/patches-3.10/003-NAND-Add-support-for-subpage-reads-for-NAND_ECC_HW_O.patch @@ -0,0 +1,141 @@ +From 90e325c5e16db262818bca442b00f5ac10b9c852 Mon Sep 17 00:00:00 2001 +From: Lars-Peter Clausen <lars@metafoo.de> +Date: Tue, 15 Mar 2011 12:33:41 +0100 +Subject: [PATCH 03/16] NAND: Add support for subpage reads for + NAND_ECC_HW_OOB_FIRST + +Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> +--- + drivers/mtd/nand/nand_base.c | 80 ++++++++++++++++++++++++++++++++++++++++-- + include/linux/mtd/nand.h | 2 +- + 2 files changed, 78 insertions(+), 4 deletions(-) + +diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c +index 287c433..0fd6f2e 100644 +--- a/drivers/mtd/nand/nand_base.c ++++ b/drivers/mtd/nand/nand_base.c +@@ -1118,7 +1118,7 @@ static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip, + * @bufpoi: buffer to store read data + */ + static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip, +- uint32_t data_offs, uint32_t readlen, uint8_t *bufpoi) ++ uint32_t data_offs, uint32_t readlen, uint8_t *bufpoi, int page) + { + int start_step, end_step, num_steps; + uint32_t *eccpos = chip->ecc.layout->eccpos; +@@ -1311,6 +1311,75 @@ static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd, + } + + /** ++ * nand_read_subpage_hwecc_oob_first - [REPLACABLE] hw ecc based sub-page read function ++ * @mtd: mtd info structure ++ * @chip: nand chip info structure ++ * @data_offs: offset of requested data within the page ++ * @readlen: data length ++ * @bufpoi: buffer to store read data ++ * @page: page number to read ++ * ++ * Hardware ECC for large page chips, require OOB to be read first. ++ * For this ECC mode, the write_page method is re-used from ECC_HW. ++ * These methods read/write ECC from the OOB area, unlike the ++ * ECC_HW_SYNDROME support with multiple ECC steps, follows the ++ * "infix ECC" scheme and reads/writes ECC from the data area, by ++ * overwriting the NAND manufacturer bad block markings. ++ */ ++static int nand_read_subpage_hwecc_oob_first(struct mtd_info *mtd, struct nand_chip *chip, ++ uint32_t data_offs, uint32_t readlen, uint8_t *bufpoi, int page) ++{ ++ int start_step, end_step, num_steps; ++ uint32_t *eccpos = chip->ecc.layout->eccpos; ++ uint8_t *p; ++ int data_col_addr; ++ int eccsize = chip->ecc.size; ++ int eccbytes = chip->ecc.bytes; ++ uint8_t *ecc_code = chip->buffers->ecccode; ++ uint8_t *ecc_calc = chip->buffers->ecccalc; ++ int i; ++ ++ /* Column address wihin the page aligned to ECC size */ ++ start_step = data_offs / chip->ecc.size; ++ end_step = (data_offs + readlen - 1) / chip->ecc.size; ++ num_steps = end_step - start_step + 1; ++ ++ data_col_addr = start_step * chip->ecc.size; ++ ++ /* Read the OOB area first */ ++ if (mtd->writesize > 512) { ++ chip->cmdfunc(mtd, NAND_CMD_READ0, mtd->writesize, page); ++ chip->read_buf(mtd, chip->oob_poi, mtd->oobsize); ++ chip->cmdfunc(mtd, NAND_CMD_RNDOUT, data_col_addr, -1); ++ } else { ++ chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page); ++ chip->read_buf(mtd, chip->oob_poi, mtd->oobsize); ++ chip->cmdfunc(mtd, NAND_CMD_READ0, data_col_addr, page); ++ } ++ ++ for (i = 0; i < chip->ecc.total; i++) ++ ecc_code[i] = chip->oob_poi[eccpos[i]]; ++ ++ p = bufpoi + data_col_addr; ++ ++ for (i = eccbytes * start_step; num_steps; num_steps--, i += eccbytes, p += eccsize) { ++ int stat; ++ ++ chip->ecc.hwctl(mtd, NAND_ECC_READ); ++ chip->read_buf(mtd, p, eccsize); ++ chip->ecc.calculate(mtd, p, &ecc_calc[i]); ++ ++ stat = chip->ecc.correct(mtd, p, &ecc_code[i], NULL); ++ if (stat < 0) ++ mtd->ecc_stats.failed++; ++ else ++ mtd->ecc_stats.corrected += stat; ++ } ++ ++ return 0; ++} ++ ++/** + * nand_read_page_syndrome - [REPLACEABLE] hardware ECC syndrome based page read + * @mtd: mtd info structure + * @chip: nand chip info structure +@@ -1477,7 +1546,7 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from, + else if (!aligned && NAND_HAS_SUBPAGE_READ(chip) && + !oob) + ret = chip->ecc.read_subpage(mtd, chip, +- col, bytes, bufpoi); ++ col, bytes, bufpoi, page); + else + ret = chip->ecc.read_page(mtd, chip, bufpoi, + oob_required, page); +@@ -3475,8 +3544,13 @@ int nand_scan_tail(struct mtd_info *mtd) + "hardware ECC not possible\n"); + BUG(); + } +- if (!chip->ecc.read_page) ++ if (!chip->ecc.read_page) { + chip->ecc.read_page = nand_read_page_hwecc_oob_first; ++ if (!chip->ecc.read_subpage) { ++ chip->ecc.read_subpage = nand_read_subpage_hwecc_oob_first; ++ chip->options |= NAND_SUBPAGE_READ; ++ } ++ } + + case NAND_ECC_HW: + /* Use standard hwecc read page function? */ +diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h +index ab63634..ff5b62e 100644 +--- a/include/linux/mtd/nand.h ++++ b/include/linux/mtd/nand.h +@@ -349,7 +349,7 @@ struct nand_ecc_ctrl { + int (*read_page)(struct mtd_info *mtd, struct nand_chip *chip, + uint8_t *buf, int oob_required, int page); + int (*read_subpage)(struct mtd_info *mtd, struct nand_chip *chip, +- uint32_t offs, uint32_t len, uint8_t *buf); ++ uint32_t offs, uint32_t len, uint8_t *buf, int page); + int (*write_subpage)(struct mtd_info *mtd, struct nand_chip *chip, + uint32_t offset, uint32_t data_len, + const uint8_t *data_buf, int oob_required); +-- +1.7.10.4 + |