ELM hardware engine is used to detect ECC errors for BCHx ecc-schemes
(like BCH4/BCH8/BCH16). This patch extends configuration of ELM registers
for loading of BCH16 ECC syndrome.
Signed-off-by: Pekon Gupta <pekon@xxxxxx>
---
drivers/mtd/devices/elm.c | 42 +++++++++++++++++++++++++++++++++++++++
include/linux/platform_data/elm.h | 3 ++-
2 files changed, 44 insertions(+), 1 deletion(-)
diff --git a/drivers/mtd/devices/elm.c b/drivers/mtd/devices/elm.c
index 16e62ae..c6465d6 100644
--- a/drivers/mtd/devices/elm.c
+++ b/drivers/mtd/devices/elm.c
@@ -216,6 +216,34 @@ static void elm_load_syndrome(struct elm_info *info,
val = cpu_to_be32(*(u32 *) &ecc[0]) >> 12;
elm_write_reg(info, offset, val);
break;
+ case BCH16_ECC:
+ val = ecc[25] << 0 | ecc[24] << 8 |
+ ecc[23] << 16 | ecc[22] << 24;
+ elm_write_reg(info, offset, val);
+ offset += 4;
+ val = ecc[21] << 0 | ecc[20] << 8 |
+ ecc[19] << 16 | ecc[18] << 24;
+ elm_write_reg(info, offset, val);
+ offset += 4;
+ val = ecc[17] << 0 | ecc[16] << 8 |
+ ecc[15] << 16 | ecc[14] << 24;
+ elm_write_reg(info, offset, val);
+ offset += 4;
+ val = ecc[13] << 0 | ecc[12] << 8 |
+ ecc[11] << 16 | ecc[10] << 24;
+ elm_write_reg(info, offset, val);
+ offset += 4;
+ val = ecc[9] << 0 | ecc[8] << 8 |
+ ecc[7] << 16 | ecc[6] << 24;
+ elm_write_reg(info, offset, val);
+ offset += 4;
+ val = ecc[5] << 0 | ecc[4] << 8 |
+ ecc[3] << 16 | ecc[2] << 24;
+ elm_write_reg(info, offset, val);
+ offset += 4;
+ val = ecc[1] << 0 | ecc[0] << 8;
+ elm_write_reg(info, offset, val);
+ break;
default:
pr_err("invalid config bch_type\n");
}
@@ -438,6 +466,13 @@ static int elm_context_save(struct elm_info *info)
for (i = 0; i < ERROR_VECTOR_MAX; i++) {
offset = i * SYNDROME_FRAGMENT_REG_SIZE;
switch (bch_type) {
+ case BCH16_ECC:
+ regs->elm_syndrome_fragment_6[i] = elm_read_reg(info,
+ ELM_SYNDROME_FRAGMENT_6 + offset);
+ regs->elm_syndrome_fragment_5[i] = elm_read_reg(info,
+ ELM_SYNDROME_FRAGMENT_5 + offset);
+ regs->elm_syndrome_fragment_4[i] = elm_read_reg(info,
+ ELM_SYNDROME_FRAGMENT_4 + offset);
case BCH8_ECC:
regs->elm_syndrome_fragment_3[i] = elm_read_reg(info,
ELM_SYNDROME_FRAGMENT_3 + offset);
@@ -476,6 +511,13 @@ static int elm_context_restore(struct elm_info *info)
for (i = 0; i < ERROR_VECTOR_MAX; i++) {
offset = i * SYNDROME_FRAGMENT_REG_SIZE;
switch (bch_type) {
+ case BCH16_ECC:
+ elm_write_reg(info, ELM_SYNDROME_FRAGMENT_6 + offset,
+ regs->elm_syndrome_fragment_6[i]);
+ elm_write_reg(info, ELM_SYNDROME_FRAGMENT_5 + offset,
+ regs->elm_syndrome_fragment_5[i]);
+ elm_write_reg(info, ELM_SYNDROME_FRAGMENT_4 + offset,
+ regs->elm_syndrome_fragment_4[i]);
case BCH8_ECC:
elm_write_reg(info, ELM_SYNDROME_FRAGMENT_3 + offset,
regs->elm_syndrome_fragment_3[i]);
diff --git a/include/linux/platform_data/elm.h b/include/linux/platform_data/elm.h
index dc0218d..51312f0 100644
--- a/include/linux/platform_data/elm.h
+++ b/include/linux/platform_data/elm.h
@@ -21,6 +21,7 @@
enum bch_ecc {
BCH4_ECC = 0,
BCH8_ECC,
+ BCH16_ECC
};
/* ELM support 8 error syndrome process */
@@ -38,7 +39,7 @@ struct elm_errorvec {
bool error_reported;
bool error_uncorrectable;
int error_count;
- int error_loc[ERROR_VECTOR_MAX];
+ int error_loc[16];
};
void elm_decode_bch_error_page(struct device *dev, u8 *ecc_calc,
--
1.8.5.1.163.gd7aced9
--
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