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 | 134 |
1 files changed, 0 insertions, 134 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 deleted file mode 100644 index ba40603..0000000 --- a/target/linux/xburst/patches-3.10/003-NAND-Add-support-for-subpage-reads-for-NAND_ECC_HW_O.patch +++ /dev/null @@ -1,134 +0,0 @@ -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(-) - ---- 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 m - * @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_firs - } - - /** -+ * 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_i - 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); -@@ -3488,8 +3557,13 @@ 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? */ ---- 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); |