drivers: mtd: nand: cadence: Support cmd SET_FEATURES & GET_FEATURES

Support NAND_CMD_SET_FEATURES & NAND_CMD_GET_FEATURES.
These commands is one of the basic commands of NAND. The parameters get
from these commands will be used to set timing mode
of NAND data interface.

Signed-off-by: Dinesh Maniyam <dinesh.maniyam@intel.com>

diff --git a/drivers/mtd/nand/raw/cadence_nand.c b/drivers/mtd/nand/raw/cadence_nand.c
index 720b0eb..71bab97 100644 (file)
--- a/drivers/mtd/nand/raw/cadence_nand.c
+++ b/drivers/mtd/nand/raw/cadence_nand.c
@@ -2010,6 +2010,29 @@ static int cadence_nand_reset(struct mtd_info *mtd, unsigned int command)
        return 0;
 }
 
+static int cadence_nand_features(struct mtd_info *mtd, u8 offset_in_page, u32 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;
+
+       if (command == NAND_CMD_GET_FEATURES)
+               ret = cadence_nand_cmd_data(chip, ONFI_SUBFEATURE_PARAM_LEN,
+                                           GCMD_DIR_READ);
+       else
+               ret = cadence_nand_cmd_data(chip, ONFI_SUBFEATURE_PARAM_LEN,
+                                           GCMD_DIR_WRITE);
+
+       return ret;
+}
+
 static void cadence_nand_cmdfunc(struct mtd_info *mtd, unsigned int command,
                                 int offset_in_page, int page)
 {
@@ -2034,6 +2057,11 @@ static void cadence_nand_cmdfunc(struct mtd_info *mtd, unsigned int command,
        case NAND_CMD_RESET:
                ret = cadence_nand_reset(mtd, command);
                break;
+
+       case NAND_CMD_SET_FEATURES:
+       case NAND_CMD_GET_FEATURES:
+               ret = cadence_nand_features(mtd, offset_in_page, command);
+               break;
        /*
         * ecc will override other command for read, write and erase
         */
@@ -2076,6 +2104,8 @@ static u8 cadence_nand_read_byte(struct mtd_info *mtd)
                        size = 8;
                else if (cadence->cmd == NAND_CMD_PARAM)
                        size = sizeof(struct nand_jedec_params);
+               else if (cadence->cmd == NAND_CMD_GET_FEATURES)
+                       size = ONFI_SUBFEATURE_PARAM_LEN;
 
                cadence_nand_read_buf(mtd, &cadence->buf[0], size);
        }