chip->ecc.calculate() is used for calculating and fetching of ECC syndrome by
processing the data passed during Read/Write accesses.
All H/W based ECC schemes use GPMC controller to calculate ECC syndrome.
But each BCHx_ECC scheme has its own implemetation of post-processing and
fetching ECC syndrome from GPMC controller.
This patch updates OMAP_ECC_BCH8_CODE_HW ECC scheme in following way:
- merges various sub-functions into single omap_calculate_ecc_bch().
- removes omap_ecc_disable() and instead uses it as inline.
Signed-off-by: Pekon Gupta <pe...@ti.com>
---
drivers/mtd/nand/omap_gpmc.c | 82 ++++++++++----------------------------------
1 file changed, 18 insertions(+), 64 deletions(-)
diff --git a/drivers/mtd/nand/omap_gpmc.c b/drivers/mtd/nand/omap_gpmc.c
index f3b86e5..40b71a7 100644
--- a/drivers/mtd/nand/omap_gpmc.c
+++ b/drivers/mtd/nand/omap_gpmc.c
@@ -281,34 +281,26 @@ static void omap_enable_hwecc(struct mtd_info *mtd,
int32_t mode)
writel(ecc_config_val | 0x1, &gpmc_cfg->ecc_config);
}
-/*
- * omap_ecc_disable - Disable H/W ECC calculation
- *
- * @mtd: MTD device structure
- */
-static void __maybe_unused omap_ecc_disable(struct mtd_info *mtd)
-{
- writel((readl(&gpmc_cfg->ecc_config) & ~0x1), &gpmc_cfg->ecc_config);
-}
#if defined(CONFIG_NAND_OMAP_ECC_BCH8_CODE_HW)
/*
- * BCH8 support (needs ELM and thus AM33xx-only)
- */
-/*
- * omap_read_bch8_result - Read BCH result for BCH8 level
+ * omap_calculate_ecc_bch - Read BCH ECC result
*
- * @mtd: MTD device structure
- * @big_endian: When set read register 3 first
- * @ecc_code: Read syndrome from BCH result registers
+ * @mtd: MTD structure
+ * @dat: unused
+ * @ecc_code: ecc_code buffer
*/
-static void omap_read_bch8_result(struct mtd_info *mtd, uint8_t big_endian,
+static int omap_calculate_ecc_bch(struct mtd_info *mtd, const uint8_t *dat,
uint8_t *ecc_code)
{
+ struct nand_chip *chip = mtd->priv;
+ struct nand_bch_priv *bch = chip->priv;
+ int8_t ret = 0;
uint32_t *ptr;
int8_t i = 0, j;
- if (big_endian) {
+ switch (bch->type) {
+ case ECC_BCH8:
ptr = &gpmc_cfg->bch_result_0_3[0].bch_result_x[3];
ecc_code[i++] = readl(ptr) & 0xFF;
ptr--;
@@ -319,18 +311,13 @@ static void omap_read_bch8_result(struct mtd_info *mtd,
uint8_t big_endian,
ecc_code[i++] = readl(ptr) & 0xFF;
ptr--;
}
- } else {
- ptr = &gpmc_cfg->bch_result_0_3[0].bch_result_x[0];
- for (j = 0; j < 3; j++) {
- ecc_code[i++] = readl(ptr) & 0xFF;
- ecc_code[i++] = (readl(ptr) >> 8) & 0xFF;
- ecc_code[i++] = (readl(ptr) >> 16) & 0xFF;
- ecc_code[i++] = (readl(ptr) >> 24) & 0xFF;
- ptr++;
- }
- ecc_code[i++] = readl(ptr) & 0xFF;
- ecc_code[i++] = 0; /* 14th byte is always zero */
+ break;
+ default:
+ ret = -1;
}
+ /* clear result and disable engine */
+ writel((readl(&gpmc_cfg->ecc_config) & ~0x1), &gpmc_cfg->ecc_config);
+ return ret;
}
/*
@@ -369,35 +356,6 @@ static void omap_rotate_ecc_bch(struct mtd_info *mtd,
uint8_t *calc_ecc,
}
/*
- * omap_calculate_ecc_bch - Read BCH ECC result
- *
- * @mtd: MTD structure
- * @dat: unused
- * @ecc_code: ecc_code buffer
- */
-static int omap_calculate_ecc_bch(struct mtd_info *mtd, const uint8_t *dat,
- uint8_t *ecc_code)
-{
- struct nand_chip *chip = mtd->priv;
- struct nand_bch_priv *bch = chip->priv;
- uint8_t big_endian = 1;
- int8_t ret = 0;
-
- if (bch->type == ECC_BCH8)
- omap_read_bch8_result(mtd, big_endian, ecc_code);
- else /* BCH4 and BCH16 currently not supported */
- ret = -1;
-
- /*
- * Stop reading anymore ECC vals and clear old results
- * enable will be called if more reads are required
- */
- omap_ecc_disable(mtd);
-
- return ret;
-}
-
-/*
* omap_fix_errors_bch - Correct bch error in the data
*
* @mtd: MTD device structure
@@ -594,12 +552,8 @@ static int omap_calculate_ecc_bch(struct mtd_info *mtd,
const uint8_t *dat,
*ecc++ = 0x24 ^ ((val1 >> 8) & 0xFF);
*ecc++ = 0xb5 ^ (val1 & 0xFF);
}
-
- /*
- * Stop reading anymore ECC vals and clear old results
- * enable will be called if more reads are required
- */
- omap_ecc_disable(mtd);
+ /* Stop reading anymore ECC vals and clear old results */
+ writel((readl(&gpmc_cfg->ecc_config) & ~0x1), &gpmc_cfg->ecc_config);
return ret;
}
--
1.8.1
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