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mtd: at91: atmel_nand: for PMECC, add code to check the ONFI parameter ECC requirement.
This patch will check NAND flash's ecc minimum requirement in ONFI parameter. 1. if pmecc-cap, pmecc-sector-size is set in dts. then use it. Driver will print out a WARNING if the values are different from ONFI parameters. 2. if pmecc-cap, pmecc-sector-size is not set in dts, then use the value from ONFI parameters. * If ONFI ECC parameters are in ONFI extended parameter page, since we are not support it, so assume the minimum ecc requirement is 2 bits in 512 bytes. * For non-ONFI support nand flash, also assume the minimum ecc requirement is 2 bits in 512 bytes. Signed-off-by: Josh Wu <josh.wu@atmel.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
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e66b4318f8
commit
84cfbbb85a
1 changed files with 87 additions and 3 deletions
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@ -910,6 +910,84 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
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pmecc_writel(host->ecc, CTRL, PMECC_CTRL_ENABLE);
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}
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/*
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* Get ECC requirement in ONFI parameters, returns -1 if ONFI
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* parameters is not supported.
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* return 0 if success to get the ECC requirement.
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*/
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static int get_onfi_ecc_param(struct nand_chip *chip,
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int *ecc_bits, int *sector_size)
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{
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*ecc_bits = *sector_size = 0;
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if (chip->onfi_params.ecc_bits == 0xff)
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/* TODO: the sector_size and ecc_bits need to be find in
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* extended ecc parameter, currently we don't support it.
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*/
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return -1;
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*ecc_bits = chip->onfi_params.ecc_bits;
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/* The default sector size (ecc codeword size) is 512 */
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*sector_size = 512;
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return 0;
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}
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/*
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* Get ecc requirement from ONFI parameters ecc requirement.
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* If pmecc-cap, pmecc-sector-size in DTS are not specified, this function
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* will set them according to ONFI ecc requirement. Otherwise, use the
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* value in DTS file.
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* return 0 if success. otherwise return error code.
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*/
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static int pmecc_choose_ecc(struct atmel_nand_host *host,
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int *cap, int *sector_size)
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{
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/* Get ECC requirement from ONFI parameters */
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*cap = *sector_size = 0;
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if (host->nand_chip.onfi_version) {
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if (!get_onfi_ecc_param(&host->nand_chip, cap, sector_size))
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dev_info(host->dev, "ONFI params, minimum required ECC: %d bits in %d bytes\n",
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*cap, *sector_size);
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else
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dev_info(host->dev, "NAND chip ECC reqirement is in Extended ONFI parameter, we don't support yet.\n");
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} else {
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dev_info(host->dev, "NAND chip is not ONFI compliant, assume ecc_bits is 2 in 512 bytes");
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}
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if (*cap == 0 && *sector_size == 0) {
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*cap = 2;
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*sector_size = 512;
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}
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/* If dts file doesn't specify then use the one in ONFI parameters */
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if (host->pmecc_corr_cap == 0) {
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/* use the most fitable ecc bits (the near bigger one ) */
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if (*cap <= 2)
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host->pmecc_corr_cap = 2;
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else if (*cap <= 4)
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host->pmecc_corr_cap = 4;
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else if (*cap < 8)
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host->pmecc_corr_cap = 8;
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else if (*cap < 12)
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host->pmecc_corr_cap = 12;
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else if (*cap < 24)
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host->pmecc_corr_cap = 24;
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else
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return -EINVAL;
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}
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if (host->pmecc_sector_size == 0) {
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/* use the most fitable sector size (the near smaller one ) */
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if (*sector_size >= 1024)
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host->pmecc_sector_size = 1024;
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else if (*sector_size >= 512)
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host->pmecc_sector_size = 512;
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else
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return -EINVAL;
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}
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return 0;
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}
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static int __init atmel_pmecc_nand_init_params(struct platform_device *pdev,
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struct atmel_nand_host *host)
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{
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@ -918,9 +996,15 @@ static int __init atmel_pmecc_nand_init_params(struct platform_device *pdev,
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struct resource *regs, *regs_pmerr, *regs_rom;
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int cap, sector_size, err_no;
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if (host->pmecc_corr_cap == 0 || host->pmecc_sector_size == 0)
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/* TODO: Should use ONFI ecc parameters. */
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return -EINVAL;
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err_no = pmecc_choose_ecc(host, &cap, §or_size);
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if (err_no) {
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dev_err(host->dev, "The NAND flash's ECC requirement are not support!");
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return err_no;
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}
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if (cap != host->pmecc_corr_cap ||
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sector_size != host->pmecc_sector_size)
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dev_info(host->dev, "WARNING: Be Caution! Using different PMECC parameters from Nand ONFI ECC reqirement.\n");
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cap = host->pmecc_corr_cap;
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sector_size = host->pmecc_sector_size;
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