diff options
Diffstat (limited to 'target/linux/xburst/patches-3.18/003-NAND-Add-support-for-subpage-reads-for-NAND_ECC_HW_O.patch')
| -rw-r--r-- | target/linux/xburst/patches-3.18/003-NAND-Add-support-for-subpage-reads-for-NAND_ECC_HW_O.patch | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/target/linux/xburst/patches-3.18/003-NAND-Add-support-for-subpage-reads-for-NAND_ECC_HW_O.patch b/target/linux/xburst/patches-3.18/003-NAND-Add-support-for-subpage-reads-for-NAND_ECC_HW_O.patch deleted file mode 100644 index 65e739d479..0000000000 --- a/target/linux/xburst/patches-3.18/003-NAND-Add-support-for-subpage-reads-for-NAND_ECC_HW_O.patch +++ /dev/null @@ -1,104 +0,0 @@ -From 6031a240816d1c9a10f596d0648e586f6b878809 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 3/7] NAND: Add support for subpage reads for - NAND_ECC_HW_OOB_FIRST - ---- - drivers/mtd/nand/nand_base.c | 77 +++++++++++++++++++++++++++++++++++++++++- - 1 file changed, 76 insertions(+), 1 deletion(-) - ---- a/drivers/mtd/nand/nand_base.c -+++ b/drivers/mtd/nand/nand_base.c -@@ -1398,6 +1398,75 @@ 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 -@@ -3961,8 +4030,14 @@ int nand_scan_tail(struct mtd_info *mtd) - pr_warn("No ECC functions supplied; hardware ECC not possible\n"); - BUG(); - } -- if (!ecc->read_page) -+ -+ if (!ecc->read_page) { - ecc->read_page = nand_read_page_hwecc_oob_first; -+ if (!ecc->read_subpage) { -+ ecc->read_subpage = nand_read_subpage_hwecc_oob_first; -+ chip->options |= NAND_SUBPAGE_READ; -+ } -+ } - - case NAND_ECC_HW: - /* Use standard hwecc read page function? */ |