mtd: nand: omap: add support for BCH16_ECC - NAND driver updates
This patch add support for BCH16_ECC to omap_gpmc driver.
*need to BCH16 ECC scheme*
With newer SLC Flash technologies and MLC NAND, and large densities, pagesizes
Flash devices have become more suspectible to bit-flips. Thus stronger
ECC schemes are required for protecting the data.
But stronger ECC schemes have come with larger-sized ECC syndromes which require
more space in OOB/Spare. This puts constrains like;
(a) BCH16_ECC can correct 16 bit-flips per 512Bytes of data.
(b) BCH16_ECC generates 26-bytes of ECC syndrome / 512B.
Due to (b) this scheme can only be used with NAND devices which have enough
OOB to satisfy following equation:
OOBsize per page >= 26 * (page-size / 512)
Signed-off-by: Pekon Gupta <pekon@ti.com>
diff --git a/drivers/mtd/nand/omap_gpmc.c b/drivers/mtd/nand/omap_gpmc.c
index cdfa6bc..1acf06b 100644
--- a/drivers/mtd/nand/omap_gpmc.c
+++ b/drivers/mtd/nand/omap_gpmc.c
@@ -224,6 +224,19 @@
eccsize1 = 2; /* non-ECC bits in nibbles per sector */
}
break;
+ case OMAP_ECC_BCH16_CODE_HW:
+ ecc_algo = 0x1;
+ bch_type = 0x2;
+ if (mode == NAND_ECC_WRITE) {
+ bch_wrapmode = 0x01;
+ eccsize0 = 0; /* extra bits in nibbles per sector */
+ eccsize1 = 52; /* OOB bits in nibbles per sector */
+ } else {
+ bch_wrapmode = 0x01;
+ eccsize0 = 52; /* ECC bits in nibbles per sector */
+ eccsize1 = 0; /* non-ECC bits in nibbles per sector */
+ }
+ break;
default:
return;
}
@@ -290,6 +303,29 @@
ptr--;
}
break;
+ case OMAP_ECC_BCH16_CODE_HW:
+ val = readl(&gpmc_cfg->bch_result_4_6[0].bch_result_x[2]);
+ ecc_code[i++] = (val >> 8) & 0xFF;
+ ecc_code[i++] = (val >> 0) & 0xFF;
+ val = readl(&gpmc_cfg->bch_result_4_6[0].bch_result_x[1]);
+ ecc_code[i++] = (val >> 24) & 0xFF;
+ ecc_code[i++] = (val >> 16) & 0xFF;
+ ecc_code[i++] = (val >> 8) & 0xFF;
+ ecc_code[i++] = (val >> 0) & 0xFF;
+ val = readl(&gpmc_cfg->bch_result_4_6[0].bch_result_x[0]);
+ ecc_code[i++] = (val >> 24) & 0xFF;
+ ecc_code[i++] = (val >> 16) & 0xFF;
+ ecc_code[i++] = (val >> 8) & 0xFF;
+ ecc_code[i++] = (val >> 0) & 0xFF;
+ for (j = 3; j >= 0; j--) {
+ val = readl(&gpmc_cfg->bch_result_0_3[0].bch_result_x[j]
+ );
+ ecc_code[i++] = (val >> 24) & 0xFF;
+ ecc_code[i++] = (val >> 16) & 0xFF;
+ ecc_code[i++] = (val >> 8) & 0xFF;
+ ecc_code[i++] = (val >> 0) & 0xFF;
+ }
+ break;
default:
return -EINVAL;
}
@@ -308,6 +344,8 @@
case OMAP_ECC_BCH8_CODE_HW:
ecc_code[chip->ecc.bytes - 1] = 0x00;
break;
+ case OMAP_ECC_BCH16_CODE_HW:
+ break;
default:
return -EINVAL;
}
@@ -333,7 +371,7 @@
struct omap_nand_info *info = chip->priv;
struct nand_ecc_ctrl *ecc = &chip->ecc;
uint32_t error_count = 0, error_max;
- uint32_t error_loc[8];
+ uint32_t error_loc[ELM_MAX_ERROR_COUNT];
enum bch_level bch_type;
uint32_t i, ecc_flag = 0;
uint8_t count, err = 0;
@@ -365,6 +403,10 @@
bch_type = BCH_8_BIT;
omap_reverse_list(calc_ecc, ecc->bytes - 1);
break;
+ case OMAP_ECC_BCH16_CODE_HW:
+ bch_type = BCH_16_BIT;
+ omap_reverse_list(calc_ecc, ecc->bytes);
+ break;
default:
return -EINVAL;
}
@@ -381,6 +423,9 @@
/* 14th byte in ECC is reserved to match ROM layout */
error_max = SECTOR_BYTES + (ecc->bytes - 1);
break;
+ case OMAP_ECC_BCH16_CODE_HW:
+ error_max = SECTOR_BYTES + ecc->bytes;
+ break;
default:
return -EINVAL;
}
@@ -666,6 +711,38 @@
return -EINVAL;
#endif
+ case OMAP_ECC_BCH16_CODE_HW:
+#ifdef CONFIG_NAND_OMAP_ELM
+ debug("nand: using OMAP_ECC_BCH16_CODE_HW\n");
+ /* check ecc-scheme requirements before updating ecc info */
+ if ((26 * eccsteps) + BADBLOCK_MARKER_LENGTH > oobsize) {
+ printf("nand: error: insufficient OOB: require=%d\n", (
+ (26 * eccsteps) + BADBLOCK_MARKER_LENGTH));
+ return -EINVAL;
+ }
+ /* intialize ELM for ECC error detection */
+ elm_init();
+ /* populate ecc specific fields */
+ nand->ecc.mode = NAND_ECC_HW;
+ nand->ecc.size = SECTOR_BYTES;
+ nand->ecc.bytes = 26;
+ nand->ecc.strength = 16;
+ nand->ecc.hwctl = omap_enable_hwecc;
+ nand->ecc.correct = omap_correct_data_bch;
+ nand->ecc.calculate = omap_calculate_ecc;
+ nand->ecc.read_page = omap_read_page_bch;
+ /* define ecc-layout */
+ ecclayout->eccbytes = nand->ecc.bytes * eccsteps;
+ for (i = 0; i < ecclayout->eccbytes; i++)
+ ecclayout->eccpos[i] = i + BADBLOCK_MARKER_LENGTH;
+ ecclayout->oobfree[0].offset = i + BADBLOCK_MARKER_LENGTH;
+ ecclayout->oobfree[0].length = oobsize - nand->ecc.bytes -
+ BADBLOCK_MARKER_LENGTH;
+ break;
+#else
+ printf("nand: error: CONFIG_NAND_OMAP_ELM required for ECC\n");
+ return -EINVAL;
+#endif
default:
debug("nand: error: ecc scheme not enabled or supported\n");
return -EINVAL;