diff options
Diffstat (limited to 'target/linux/mvebu/patches-3.10/0094-mtd-get-the-ECC-info-from-the-Extended-Parameter-Pag.patch')
| -rw-r--r-- | target/linux/mvebu/patches-3.10/0094-mtd-get-the-ECC-info-from-the-Extended-Parameter-Pag.patch | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/target/linux/mvebu/patches-3.10/0094-mtd-get-the-ECC-info-from-the-Extended-Parameter-Pag.patch b/target/linux/mvebu/patches-3.10/0094-mtd-get-the-ECC-info-from-the-Extended-Parameter-Pag.patch new file mode 100644 index 0000000..b3969e1 --- /dev/null +++ b/target/linux/mvebu/patches-3.10/0094-mtd-get-the-ECC-info-from-the-Extended-Parameter-Pag.patch @@ -0,0 +1,131 @@ +From f617846b1e20a2ba59cdd9435715339eaed1e251 Mon Sep 17 00:00:00 2001 +From: Huang Shijie <b32955@freescale.com> +Date: Wed, 22 May 2013 10:28:27 +0800 +Subject: [PATCH 094/203] mtd: get the ECC info from the Extended Parameter + Page + +Since the ONFI 2.1, the onfi spec adds the Extended Parameter Page +to store the ECC info. + +The onfi spec tells us that if the nand chip's recommended ECC codeword +size is not 512 bytes, then the @ecc_bits is 0xff. The host _SHOULD_ then +read the Extended ECC information that is part of the extended parameter +page to retrieve the ECC requirements for this device. + +This patch implement the reading of the Extended Parameter Page, and parses +the sections for ECC type, and get the ECC info from the ECC section. + +Tested this patch with Micron MT29F64G08CBABAWP. + +Acked-by: Pekon Gupta <pekon@ti.com> +Signed-off-by: Huang Shijie <b32955@freescale.com> +Reviewed-and-tested-by: Brian Norris <computersforpeace@gmail.com> +Signed-off-by: Brian Norris <computersforpeace@gmail.com> +Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> +--- + drivers/mtd/nand/nand_base.c | 87 ++++++++++++++++++++++++++++++++++++++++++++ + 1 file changed, 87 insertions(+) + +--- a/drivers/mtd/nand/nand_base.c ++++ b/drivers/mtd/nand/nand_base.c +@@ -2848,6 +2848,78 @@ static u16 onfi_crc16(u16 crc, u8 const + return crc; + } + ++/* Parse the Extended Parameter Page. */ ++static int nand_flash_detect_ext_param_page(struct mtd_info *mtd, ++ struct nand_chip *chip, struct nand_onfi_params *p) ++{ ++ struct onfi_ext_param_page *ep; ++ struct onfi_ext_section *s; ++ struct onfi_ext_ecc_info *ecc; ++ uint8_t *cursor; ++ int ret = -EINVAL; ++ int len; ++ int i; ++ ++ len = le16_to_cpu(p->ext_param_page_length) * 16; ++ ep = kmalloc(len, GFP_KERNEL); ++ if (!ep) { ++ ret = -ENOMEM; ++ goto ext_out; ++ } ++ ++ /* Send our own NAND_CMD_PARAM. */ ++ chip->cmdfunc(mtd, NAND_CMD_PARAM, 0, -1); ++ ++ /* Use the Change Read Column command to skip the ONFI param pages. */ ++ chip->cmdfunc(mtd, NAND_CMD_RNDOUT, ++ sizeof(*p) * p->num_of_param_pages , -1); ++ ++ /* Read out the Extended Parameter Page. */ ++ chip->read_buf(mtd, (uint8_t *)ep, len); ++ if ((onfi_crc16(ONFI_CRC_BASE, ((uint8_t *)ep) + 2, len - 2) ++ != le16_to_cpu(ep->crc))) { ++ pr_debug("fail in the CRC.\n"); ++ goto ext_out; ++ } ++ ++ /* ++ * Check the signature. ++ * Do not strictly follow the ONFI spec, maybe changed in future. ++ */ ++ if (strncmp(ep->sig, "EPPS", 4)) { ++ pr_debug("The signature is invalid.\n"); ++ goto ext_out; ++ } ++ ++ /* find the ECC section. */ ++ cursor = (uint8_t *)(ep + 1); ++ for (i = 0; i < ONFI_EXT_SECTION_MAX; i++) { ++ s = ep->sections + i; ++ if (s->type == ONFI_SECTION_TYPE_2) ++ break; ++ cursor += s->length * 16; ++ } ++ if (i == ONFI_EXT_SECTION_MAX) { ++ pr_debug("We can not find the ECC section.\n"); ++ goto ext_out; ++ } ++ ++ /* get the info we want. */ ++ ecc = (struct onfi_ext_ecc_info *)cursor; ++ ++ if (ecc->codeword_size) { ++ chip->ecc_strength_ds = ecc->ecc_bits; ++ chip->ecc_step_ds = 1 << ecc->codeword_size; ++ } ++ ++ pr_info("ONFI extended param page detected.\n"); ++ return 0; ++ ++ext_out: ++ kfree(ep); ++ return ret; ++} ++ + /* + * Check if the NAND chip is ONFI compliant, returns 1 if it is, 0 otherwise. + */ +@@ -2927,6 +2999,21 @@ static int nand_flash_detect_onfi(struct + if (p->ecc_bits != 0xff) { + chip->ecc_strength_ds = p->ecc_bits; + chip->ecc_step_ds = 512; ++ } else if (chip->onfi_version >= 21 && ++ (onfi_feature(chip) & ONFI_FEATURE_EXT_PARAM_PAGE)) { ++ ++ /* ++ * The nand_flash_detect_ext_param_page() uses the ++ * Change Read Column command which maybe not supported ++ * by the chip->cmdfunc. So try to update the chip->cmdfunc ++ * now. We do not replace user supplied command function. ++ */ ++ if (mtd->writesize > 512 && chip->cmdfunc == nand_command) ++ chip->cmdfunc = nand_command_lp; ++ ++ /* The Extended Parameter Page is supported since ONFI 2.1. */ ++ if (nand_flash_detect_ext_param_page(mtd, chip, p)) ++ pr_info("Failed to detect the extended param page.\n"); + } + + pr_info("ONFI flash detected\n"); |