[PATCH 09/19] drivers: mtd: nand: cadence: Support cmd SET_FEATURES & GET_FEATURES

[dinesh . maniyam]

From: Dinesh Maniyam <dinesh.mani...@intel.com>

This patch is to support NAND_CMD_SET_FEATURES & NAND_CMD_GET_FEATURES.
These commands is one of the basic commands of NAND. Params get from
these commands will be used to set timing mode of NAND data interface.

Signed-off-by: Dinesh Maniyam <dinesh.mani...@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 1b1335af68..108e1fa965 100644
--- a/drivers/mtd/nand/raw/cadence_nand.c
+++ b/drivers/mtd/nand/raw/cadence_nand.c
@@ -1982,6 +1982,29 @@ 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 cadence_nand_info *cadence = mtd_to_cadence(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;
+
+       if (command == NAND_CMD_GET_FEATURES)
+               ret = cadence_nand_cmd_data(cadence, ONFI_SUBFEATURE_PARAM_LEN,
+                                           GCMD_DIR_READ);
+       else
+               ret = cadence_nand_cmd_data(cadence, 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)
 {
@@ -2006,6 +2029,11 @@ 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
         */
@@ -2046,6 +2074,8 @@ 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);
        }
-- 
2.26.2