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drivers: mtd: nand: cadence: Add support for readid command

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Add support for readid command in Cadence NAND driver.
The id is unique and used for flash identification.

Signed-off-by: Dinesh Maniyam <dinesh.maniyam@intel.com>
This commit is contained in:
Dinesh Maniyam
2025-02-27 00:18:19 +08:00
committed by Michael Trimarchi
parent ac682c4da9
commit 1d23aca355
1 changed files with 31 additions and 1 deletions
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32
drivers/mtd/nand/raw/cadence_nand.c
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@@ -1949,6 +1949,27 @@ static int cadence_nand_status(struct mtd_info *mtd, unsigned int command)
return 0;
}
static int cadence_nand_readid(struct mtd_info *mtd, int offset_in_page, unsigned int command)
{
struct nand_chip *chip = mtd_to_nand(mtd);
u8 addrs = (u8)offset_in_page;
int ret = 0;
ret = cadence_nand_cmd_opcode(chip, command);
if (ret)
return ret;
ret = cadence_nand_cmd_address(chip, ONE_CYCLE, &addrs);
if (ret)
return ret;
ret = cadence_nand_cmd_data(chip, 8, 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)
{
@@ -1961,6 +1982,11 @@ static void cadence_nand_cmdfunc(struct mtd_info *mtd, unsigned int command,
case NAND_CMD_STATUS:
ret = cadence_nand_status(mtd, command);
break;
case NAND_CMD_READID:
ret = cadence_nand_readid(mtd, offset_in_page, command);
break;
/*
* ecc will override other command for read, write and erase
*/
@@ -1992,8 +2018,12 @@ static u8 cadence_nand_read_byte(struct mtd_info *mtd)
u32 size = 1;
u8 val;
if (cadence->buf_index == 0)
if (cadence->buf_index == 0) {
if (cadence->cmd == NAND_CMD_READID)
size = 8;
cadence_nand_read_buf(mtd, &cadence->buf[0], size);
}
val = *(&cadence->buf[0] + cadence->buf_index);
cadence->buf_index++;