[PATCH v2 4/5] mtd: spinand: micron: OTP access for MT29F2G01ABAGD
Martin Kurbanov
mmkurbanov at salutedevices.com
Tue Aug 27 10:49:02 PDT 2024
Support for OTP area access on Micron MT29F2G01ABAGD chip.
Signed-off-by: Martin Kurbanov <mmkurbanov at salutedevices.com>
---
drivers/mtd/nand/spi/micron.c | 117 +++++++++++++++++++++++++++++++++-
1 file changed, 116 insertions(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/spi/micron.c b/drivers/mtd/nand/spi/micron.c
index 8d741be6d5f3e..a538409db4ccd 100644
--- a/drivers/mtd/nand/spi/micron.c
+++ b/drivers/mtd/nand/spi/micron.c
@@ -9,6 +9,7 @@
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/mtd/spinand.h>
+#include <linux/spi/spi-mem.h>
#define SPINAND_MFR_MICRON 0x2c
@@ -28,6 +29,16 @@
#define MICRON_SELECT_DIE(x) ((x) << 6)
+#define MICRON_MT29F2G01ABAGD_OTP_PAGES 12
+#define MICRON_MT29F2G01ABAGD_OTP_PAGE_SIZE 2176
+#define MICRON_MT29F2G01ABAGD_OTP_SIZE_BYTES \
+ (MICRON_MT29F2G01ABAGD_OTP_PAGES * \
+ MICRON_MT29F2G01ABAGD_OTP_PAGE_SIZE)
+
+#define MICRON_MT29F2G01ABAGD_CFG_OTP_STATE BIT(7)
+#define MICRON_MT29F2G01ABAGD_CFG_OTP_LOCK \
+ (CFG_OTP_ENABLE | MICRON_MT29F2G01ABAGD_CFG_OTP_STATE)
+
static SPINAND_OP_VARIANTS(quadio_read_cache_variants,
//SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0),
SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
@@ -182,6 +193,108 @@ static int micron_8_ecc_get_status(struct spinand_device *spinand,
return -EINVAL;
}
+static int mt29f2g01abagd_otp_is_locked(struct spinand_device *spinand)
+{
+ size_t buf_size = MICRON_MT29F2G01ABAGD_OTP_PAGE_SIZE;
+ size_t retlen;
+ u8 *buf;
+ int ret;
+
+ buf = kmalloc(buf_size, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ ret = spinand_upd_cfg(spinand,
+ MICRON_MT29F2G01ABAGD_CFG_OTP_LOCK,
+ MICRON_MT29F2G01ABAGD_CFG_OTP_STATE);
+ if (ret)
+ goto out;
+
+ ret = spinand_otp_read(spinand, 0, buf_size, buf, &retlen);
+
+ if (spinand_upd_cfg(spinand, MICRON_MT29F2G01ABAGD_CFG_OTP_LOCK,
+ 0)) {
+ WARN(1, "Can not disable OTP mode\n");
+ ret = -EIO;
+ }
+
+ if (!ret) {
+ size_t i = 0;
+
+ /* If all zeros, then the OTP area is locked. */
+ while (i < buf_size && *(uint32_t *)(&buf[i]) == 0)
+ i += 4;
+
+ if (i == buf_size)
+ ret = 1;
+ }
+
+out:
+ kfree(buf);
+ return ret;
+}
+
+static int mt29f2g01abagd_otp_info(struct spinand_device *spinand, size_t len,
+ struct otp_info *buf, size_t *retlen)
+{
+ int locked;
+
+ if (len < sizeof(*buf))
+ return -EINVAL;
+
+ locked = mt29f2g01abagd_otp_is_locked(spinand);
+ if (locked < 0)
+ return locked;
+
+ buf->locked = locked;
+ buf->start = 0;
+ buf->length = MICRON_MT29F2G01ABAGD_OTP_SIZE_BYTES;
+
+ *retlen = sizeof(*buf);
+ return 0;
+}
+
+static int mt29f2g01abagd_otp_lock(struct spinand_device *spinand, loff_t from,
+ size_t len)
+{
+ struct spi_mem_op write_op = SPINAND_WR_EN_DIS_OP(true);
+ struct spi_mem_op exec_op = SPINAND_PROG_EXEC_OP(0);
+ int ret;
+
+ ret = spinand_upd_cfg(spinand,
+ MICRON_MT29F2G01ABAGD_CFG_OTP_LOCK,
+ MICRON_MT29F2G01ABAGD_CFG_OTP_LOCK);
+ if (!ret)
+ return ret;
+
+ ret = spi_mem_exec_op(spinand->spimem, &write_op);
+ if (!ret)
+ goto out;
+
+ ret = spi_mem_exec_op(spinand->spimem, &exec_op);
+ if (!ret)
+ goto out;
+
+ ret = spinand_wait(spinand, 10, 5, NULL);
+ if (!ret)
+ goto out;
+
+out:
+ if (spinand_upd_cfg(spinand, MICRON_MT29F2G01ABAGD_CFG_OTP_LOCK, 0)) {
+ WARN(1, "Can not disable OTP mode\n");
+ ret = -EIO;
+ }
+
+ return ret;
+}
+
+static const struct spinand_otp_ops mt29f2g01abagd_otp_ops = {
+ .info = mt29f2g01abagd_otp_info,
+ .lock = mt29f2g01abagd_otp_lock,
+ .read = spinand_otp_read,
+ .write = spinand_otp_write,
+};
+
static const struct spinand_info micron_spinand_table[] = {
/* M79A 2Gb 3.3V */
SPINAND_INFO("MT29F2G01ABAGD",
@@ -193,7 +306,9 @@ static const struct spinand_info micron_spinand_table[] = {
&x4_update_cache_variants),
0,
SPINAND_ECCINFO(µn_8_ooblayout,
- micron_8_ecc_get_status)),
+ micron_8_ecc_get_status),
+ SPINAND_OTP_INFO(MICRON_MT29F2G01ABAGD_OTP_PAGES,
+ &mt29f2g01abagd_otp_ops)),
/* M79A 2Gb 1.8V */
SPINAND_INFO("MT29F2G01ABBGD",
SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0x25),
--
2.43.2
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