[resend v2 07/19] drivers: mtd: nand: cadence: Add support for NAND_CMD_PARAM

[dinesh . maniyam]

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