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Commit 2be589e4 authored by pekon gupta's avatar pekon gupta Committed by Brian Norris
Browse files

mtd: nand: omap: add support for BCH16_ECC - ELM driver updates 



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 adding support of BCH16_HW ecc-scheme.

Signed-off-by: default avatarPekon Gupta <pekon@ti.com>
Signed-off-by: default avatarBrian Norris <computersforpeace@gmail.com>
parent 27c9fd60

drivers/mtd/devices/elm.c

+36 −0
Original line number Diff line number Diff line
@@ -213,6 +213,28 @@ 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 = cpu_to_be32(*(u32 *) &ecc[22]);

				elm_write_reg(info, offset, val);

				offset += 4;

				val = cpu_to_be32(*(u32 *) &ecc[18]);

				elm_write_reg(info, offset, val);

				offset += 4;

				val = cpu_to_be32(*(u32 *) &ecc[14]);

				elm_write_reg(info, offset, val);

				offset += 4;

				val = cpu_to_be32(*(u32 *) &ecc[10]);

				elm_write_reg(info, offset, val);

				offset += 4;

				val = cpu_to_be32(*(u32 *) &ecc[6]);

				elm_write_reg(info, offset, val);

				offset += 4;

				val = cpu_to_be32(*(u32 *) &ecc[2]);

				elm_write_reg(info, offset, val);

				offset += 4;

				val = cpu_to_be32(*(u32 *) &ecc[0]) >> 16;

				elm_write_reg(info, offset, val);

				break;

			default:

				pr_err("invalid config bch_type\n");

			}
@@ -436,6 +458,13 @@ 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);
@@ -474,6 +503,13 @@ 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]);

include/linux/platform_data/elm.h

+2 −1
Original line number Diff line number Diff line
@@ -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,