From: Dinesh Maniyam dinesh.maniyam@intel.com
This patch is to add support for reading param page of NAND device. These paramaters are unique and used for identification purpose.
Signed-off-by: Dinesh Maniyam dinesh.maniyam@intel.com --- drivers/mtd/nand/raw/cadence_nand.c | 30 +++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+)
diff --git a/drivers/mtd/nand/raw/cadence_nand.c b/drivers/mtd/nand/raw/cadence_nand.c index 55fd3dfdb3..1b5cda1955 100644 --- a/drivers/mtd/nand/raw/cadence_nand.c +++ b/drivers/mtd/nand/raw/cadence_nand.c @@ -1940,6 +1940,31 @@ 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 cadence_nand_info *cadence = mtd_to_cadence(mtd); + struct nand_chip *chip = mtd_to_nand(mtd); + int ret = 0; + + ret = cadence_nand_cmd_opcode(cadence, command); + if (ret) + return ret; + + ret = cadence_nand_cmd_address(cadence, ONE_CYCLE, &offset_in_page); + if (ret) + return ret; + + ret = cadence_nand_waitfunc(mtd, chip); + if (ret) + return ret; + + ret = cadence_nand_cmd_data(cadence, 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) { @@ -1956,6 +1981,9 @@ 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 */ @@ -1988,6 +2016,8 @@ 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); }