From: Dinesh Maniyam <dinesh.mani...@intel.com> Add support for reading param page of NAND device. These paramaters are unique and used for identification purpose.
Signed-off-by: Dinesh Maniyam <dinesh.mani...@intel.com> --- v2: - remove the "this patch is to" commit phrases --- --- drivers/mtd/nand/raw/cadence_nand.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/drivers/mtd/nand/raw/cadence_nand.c b/drivers/mtd/nand/raw/cadence_nand.c index 83c6b64c1a..0775a8a0ce 100644 --- a/drivers/mtd/nand/raw/cadence_nand.c +++ b/drivers/mtd/nand/raw/cadence_nand.c @@ -1970,6 +1970,30 @@ static int cadence_nand_readid(struct mtd_info *mtd, int offset_in_page, unsigne return 0; } +static int cadence_nand_param(struct mtd_info *mtd, u8 offset_in_page, unsigned int command) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + int ret = 0; + + ret = cadence_nand_cmd_opcode(chip, command); + if (ret) + return ret; + + ret = cadence_nand_cmd_address(chip, ONE_CYCLE, &offset_in_page); + if (ret) + return ret; + + ret = cadence_nand_waitfunc(mtd, chip); + if (ret) + return ret; + + ret = cadence_nand_cmd_data(chip, sizeof(struct nand_jedec_params), GCMD_DIR_READ); + if (ret) + return ret; + + return 0; +} + static void cadence_nand_cmdfunc(struct mtd_info *mtd, unsigned int command, int offset_in_page, int page) { @@ -1987,6 +2011,9 @@ static void cadence_nand_cmdfunc(struct mtd_info *mtd, unsigned int command, ret = cadence_nand_readid(mtd, offset_in_page, command); break; + case NAND_CMD_PARAM: + ret = cadence_nand_param(mtd, offset_in_page, command); + break; /* * ecc will override other command for read, write and erase */ @@ -2021,6 +2048,8 @@ static u8 cadence_nand_read_byte(struct mtd_info *mtd) if (cadence->buf_index == 0) { if (cadence->cmd == NAND_CMD_READID) size = 8; + else if (cadence->cmd == NAND_CMD_PARAM) + size = sizeof(struct nand_jedec_params); cadence_nand_read_buf(mtd, &cadence->buf[0], size); } -- 2.19.0