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mtd: gpmi: add sanity check for the ECC
We do the check based on the following two facts: [1] The mx23/mx28 can only support 20-bits ECC, while the mx6 can supports 40-bits ECC. [2] The mx23/mx28 can only support the GF13, while the mx6 can supports GF13 and GF14. Signed-off-by: Huang Shijie <b32955@freescale.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
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9ff16f0833
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92d0e09abe
2 changed files with 30 additions and 2 deletions
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@ -94,6 +94,25 @@ static inline int get_ecc_strength(struct gpmi_nand_data *this)
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return round_down(ecc_strength, 2);
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}
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static inline bool gpmi_check_ecc(struct gpmi_nand_data *this)
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{
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struct bch_geometry *geo = &this->bch_geometry;
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/* Do the sanity check. */
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if (GPMI_IS_MX23(this) || GPMI_IS_MX28(this)) {
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/* The mx23/mx28 only support the GF13. */
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if (geo->gf_len == 14)
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return false;
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if (geo->ecc_strength > MXS_ECC_STRENGTH_MAX)
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return false;
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} else if (GPMI_IS_MX6Q(this)) {
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if (geo->ecc_strength > MX6_ECC_STRENGTH_MAX)
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return false;
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}
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return true;
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}
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int common_nfc_set_geometry(struct gpmi_nand_data *this)
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{
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struct bch_geometry *geo = &this->bch_geometry;
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@ -123,8 +142,13 @@ int common_nfc_set_geometry(struct gpmi_nand_data *this)
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/* We use the same ECC strength for all chunks. */
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geo->ecc_strength = get_ecc_strength(this);
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if (!geo->ecc_strength) {
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pr_err("wrong ECC strength.\n");
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if (!gpmi_check_ecc(this)) {
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dev_err(this->dev,
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"We can not support this nand chip."
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" Its required ecc strength(%d) is beyond our"
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" capability(%d).\n", geo->ecc_strength,
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(GPMI_IS_MX6Q(this) ? MX6_ECC_STRENGTH_MAX
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: MXS_ECC_STRENGTH_MAX));
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return -EINVAL;
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}
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@ -284,6 +284,10 @@ extern int gpmi_read_page(struct gpmi_nand_data *,
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#define STATUS_ERASED 0xff
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#define STATUS_UNCORRECTABLE 0xfe
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/* BCH's bit correction capability. */
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#define MXS_ECC_STRENGTH_MAX 20 /* mx23 and mx28 */
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#define MX6_ECC_STRENGTH_MAX 40
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/* Use the platform_id to distinguish different Archs. */
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#define IS_MX23 0x0
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#define IS_MX28 0x1
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