[PATCH v3] mtd: rawnand: macronix: OTP access for MX30LFxG18AC
Arseniy Krasnov
AVKrasnov at sberdevices.ru
Mon May 1 13:10:21 UTC 2023
This adds support for OTP area access on MX30LFxG18AC chip series.
Changelog:
v1 -> v2:
* Add slab.h include due to kernel test robot error.
v2 -> v3:
* Use 'uint64_t' as input argument for 'do_div()' instead
of 'unsigned long' due to kernel test robot error.
Signed-off-by: Arseniy Krasnov <AVKrasnov at sberdevices.ru>
---
drivers/mtd/nand/raw/nand_macronix.c | 213 +++++++++++++++++++++++++++
1 file changed, 213 insertions(+)
diff --git a/drivers/mtd/nand/raw/nand_macronix.c b/drivers/mtd/nand/raw/nand_macronix.c
index 1472f925f386..2301f990678e 100644
--- a/drivers/mtd/nand/raw/nand_macronix.c
+++ b/drivers/mtd/nand/raw/nand_macronix.c
@@ -6,6 +6,7 @@
* Author: Boris Brezillon <boris.brezillon at free-electrons.com>
*/
+#include <linux/slab.h>
#include "linux/delay.h"
#include "internals.h"
@@ -31,6 +32,20 @@
#define MXIC_CMD_POWER_DOWN 0xB9
+#define ONFI_FEATURE_ADDR_30LFXG18AC_OTP 0x90
+#define MACRONIX_30LFXG18AC_OTP_START_PAGE 0
+#define MACRONIX_30LFXG18AC_OTP_PAGES 30
+#define MACRONIX_30LFXG18AC_OTP_PAGE_SIZE 2112
+#define MACRONIX_30LFXG18AC_OTP_START_BYTE \
+ (MACRONIX_30LFXG18AC_OTP_START_PAGE * \
+ MACRONIX_30LFXG18AC_OTP_PAGE_SIZE)
+#define MACRONIX_30LFXG18AC_OTP_SIZE_BYTES \
+ (MACRONIX_30LFXG18AC_OTP_PAGES * \
+ MACRONIX_30LFXG18AC_OTP_PAGE_SIZE)
+
+#define MACRONIX_30LFXG18AC_OTP_EN BIT(0)
+#define MACRONIX_30LFXG18AC_OTP_LOCKED BIT(1)
+
struct nand_onfi_vendor_macronix {
u8 reserved;
u8 reliability_func;
@@ -316,6 +331,203 @@ static void macronix_nand_deep_power_down_support(struct nand_chip *chip)
chip->ops.resume = mxic_nand_resume;
}
+static int macronix_30lfxg18ac_get_otp_info(struct mtd_info *mtd, size_t len,
+ size_t *retlen,
+ struct otp_info *buf)
+{
+ if (len < sizeof(*buf))
+ return -EINVAL;
+
+ /* Don't know how to check that OTP is locked. */
+ buf->locked = 0;
+ buf->start = MACRONIX_30LFXG18AC_OTP_START_BYTE;
+ buf->length = MACRONIX_30LFXG18AC_OTP_SIZE_BYTES;
+
+ *retlen = sizeof(*buf);
+
+ return 0;
+}
+
+static int macronix_30lfxg18ac_otp_enable(struct nand_chip *nand)
+{
+ uint8_t feature_buf[ONFI_SUBFEATURE_PARAM_LEN] = { 0 };
+
+ feature_buf[0] = MACRONIX_30LFXG18AC_OTP_EN;
+ return nand_set_features(nand, ONFI_FEATURE_ADDR_30LFXG18AC_OTP,
+ feature_buf);
+}
+
+static int macronix_30lfxg18ac_otp_disable(struct nand_chip *nand)
+{
+ uint8_t feature_buf[ONFI_SUBFEATURE_PARAM_LEN] = { 0 };
+
+ return nand_set_features(nand, ONFI_FEATURE_ADDR_30LFXG18AC_OTP,
+ feature_buf);
+}
+
+static int __macronix_30lfxg18ac_rw_otp(struct mtd_info *mtd,
+ loff_t offs_in_flash,
+ size_t len, size_t *retlen,
+ u_char *buf, bool write)
+{
+ struct nand_chip *nand;
+ size_t bytes_handled;
+ off_t offs_in_page;
+ uint64_t page;
+ void *dma_buf;
+ int ret;
+
+ /* 'nand_prog/read_page_op()' may use 'buf' as DMA buffer,
+ * so allocate properly aligned memory for it. This is
+ * needed because cross page accesses may lead to unaligned
+ * buffer address for DMA.
+ */
+ dma_buf = kmalloc(MACRONIX_30LFXG18AC_OTP_PAGE_SIZE, GFP_KERNEL);
+ if (!dma_buf)
+ return -ENOMEM;
+
+ nand = mtd_to_nand(mtd);
+ nand_select_target(nand, 0);
+
+ ret = macronix_30lfxg18ac_otp_enable(nand);
+ if (ret)
+ goto out_otp;
+
+ page = offs_in_flash;
+ /* 'page' will be result of division. */
+ offs_in_page = do_div(page, MACRONIX_30LFXG18AC_OTP_PAGE_SIZE);
+ bytes_handled = 0;
+
+ while (bytes_handled < len &&
+ page < MACRONIX_30LFXG18AC_OTP_PAGES) {
+ size_t bytes_to_handle;
+
+ bytes_to_handle = min_t(size_t, len - bytes_handled,
+ MACRONIX_30LFXG18AC_OTP_PAGE_SIZE -
+ offs_in_page);
+
+ if (write) {
+ memcpy(dma_buf, &buf[bytes_handled], bytes_to_handle);
+ ret = nand_prog_page_op(nand, page, offs_in_page,
+ dma_buf, bytes_to_handle);
+ } else {
+ ret = nand_read_page_op(nand, page, offs_in_page,
+ dma_buf, bytes_to_handle);
+ if (!ret)
+ memcpy(&buf[bytes_handled], dma_buf,
+ bytes_to_handle);
+ }
+ if (ret)
+ goto out_otp;
+
+ bytes_handled += bytes_to_handle;
+ offs_in_page = 0;
+ page++;
+ }
+
+ *retlen = bytes_handled;
+
+out_otp:
+ if (ret)
+ dev_err(&mtd->dev, "failed to perform OTP IO: %i\n", ret);
+
+ ret = macronix_30lfxg18ac_otp_disable(nand);
+ WARN(ret, "failed to leave OTP mode after %s\n",
+ write ? "write" : "read");
+ nand_deselect_target(nand);
+ kfree(dma_buf);
+
+ return ret;
+}
+
+static int macronix_30lfxg18ac_write_otp(struct mtd_info *mtd, loff_t to,
+ size_t len, size_t *rlen,
+ const u_char *buf)
+{
+ return __macronix_30lfxg18ac_rw_otp(mtd, to, len, rlen, (u_char *)buf,
+ true);
+}
+
+static int macronix_30lfxg18ac_read_otp(struct mtd_info *mtd, loff_t from,
+ size_t len, size_t *rlen,
+ u_char *buf)
+{
+ return __macronix_30lfxg18ac_rw_otp(mtd, from, len, rlen, buf, false);
+}
+
+static int macronix_30lfxg18ac_lock_otp(struct mtd_info *mtd, loff_t from,
+ size_t len)
+{
+ uint8_t feature_buf[ONFI_SUBFEATURE_PARAM_LEN] = { 0 };
+ struct nand_chip *nand;
+ int ret;
+
+ if (from != MACRONIX_30LFXG18AC_OTP_START_BYTE ||
+ len != MACRONIX_30LFXG18AC_OTP_SIZE_BYTES)
+ return -EINVAL;
+
+ dev_dbg(&mtd->dev, "locking OTP\n");
+
+ nand = mtd_to_nand(mtd);
+ nand_select_target(nand, 0);
+
+ feature_buf[0] = MACRONIX_30LFXG18AC_OTP_EN |
+ MACRONIX_30LFXG18AC_OTP_LOCKED;
+ ret = nand_set_features(nand, ONFI_FEATURE_ADDR_30LFXG18AC_OTP,
+ feature_buf);
+ if (ret) {
+ dev_err(&mtd->dev,
+ "failed to lock OTP (set features): %i\n", ret);
+ nand_deselect_target(nand);
+ return ret;
+ }
+
+ /* Do dummy page prog with zero address. */
+ feature_buf[0] = 0;
+ ret = nand_prog_page_op(nand, 0, 0, feature_buf, 1);
+ if (ret)
+ dev_err(&mtd->dev,
+ "failed to lock OTP (page prog): %i\n", ret);
+
+ ret = macronix_30lfxg18ac_otp_disable(nand);
+ WARN(ret, "failed to leave OTP mode after lock\n");
+
+ nand_deselect_target(nand);
+
+ return ret;
+}
+
+static void macronix_nand_setup_otp(struct nand_chip *chip)
+{
+ static const char * const supported_otp_models[] = {
+ "MX30LF1G18AC",
+ "MX30LF2G18AC",
+ "MX30LF4G18AC",
+ };
+ struct mtd_info *mtd;
+
+ if (!chip->parameters.supports_set_get_features)
+ return;
+
+ if (match_string(supported_otp_models,
+ ARRAY_SIZE(supported_otp_models),
+ chip->parameters.model) < 0)
+ return;
+
+ bitmap_set(chip->parameters.get_feature_list,
+ ONFI_FEATURE_ADDR_30LFXG18AC_OTP, 1);
+ bitmap_set(chip->parameters.set_feature_list,
+ ONFI_FEATURE_ADDR_30LFXG18AC_OTP, 1);
+
+ mtd = nand_to_mtd(chip);
+ mtd->_get_fact_prot_info = macronix_30lfxg18ac_get_otp_info;
+ mtd->_read_fact_prot_reg = macronix_30lfxg18ac_read_otp;
+ mtd->_get_user_prot_info = macronix_30lfxg18ac_get_otp_info;
+ mtd->_read_user_prot_reg = macronix_30lfxg18ac_read_otp;
+ mtd->_write_user_prot_reg = macronix_30lfxg18ac_write_otp;
+ mtd->_lock_user_prot_reg = macronix_30lfxg18ac_lock_otp;
+}
+
static int macronix_nand_init(struct nand_chip *chip)
{
if (nand_is_slc(chip))
@@ -325,6 +537,7 @@ static int macronix_nand_init(struct nand_chip *chip)
macronix_nand_onfi_init(chip);
macronix_nand_block_protection_support(chip);
macronix_nand_deep_power_down_support(chip);
+ macronix_nand_setup_otp(chip);
return 0;
}
--
2.35.0
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