From 26b53212b8f207243e5621d6e121bac559c59678 Mon Sep 17 00:00:00 2001
From: Ye Li <ye.li@nxp.com>
Date: Sat, 7 Aug 2021 16:00:54 +0800
Subject: [PATCH] drivers: misc: s400_api: Update API for fuse read and write

Add API to support fuse read and write

Signed-off-by: Ye Li <ye.li@nxp.com>
---
 arch/arm/include/asm/arch-imx8ulp/s400_api.h |  7 +-
 drivers/misc/imx8ulp/s400_api.c              | 81 ++++++++++++++++++++
 2 files changed, 87 insertions(+), 1 deletion(-)

diff --git a/arch/arm/include/asm/arch-imx8ulp/s400_api.h b/arch/arm/include/asm/arch-imx8ulp/s400_api.h
index 41ad4002b1..c848f0dfb8 100644
--- a/arch/arm/include/asm/arch-imx8ulp/s400_api.h
+++ b/arch/arm/include/asm/arch-imx8ulp/s400_api.h
@@ -14,8 +14,11 @@
 #define AHAB_AUTH_OEM_CTNR_CID  0x87
 #define AHAB_VERIFY_IMG_CID     0x88
 #define AHAB_RELEASE_CTNR_CID   0x89
-#define AHAB_RELEASE_RDC_REQ_CID   0xC4
+#define AHAB_WRITE_SECURE_FUSE_REQ_CID	0x91
 #define AHAB_FWD_LIFECYCLE_UP_REQ_CID   0x95
+#define AHAB_READ_FUSE_REQ_CID	0x97
+#define AHAB_RELEASE_RDC_REQ_CID   0xC4
+#define AHAB_WRITE_FUSE_REQ_CID	0xD6
 
 #define S400_MAX_MSG          8U
 
@@ -32,5 +35,7 @@ int ahab_auth_oem_ctnr(ulong ctnr_addr, u32 *response);
 int ahab_release_container(u32 *response);
 int ahab_verify_image(u32 img_id, u32 *response);
 int ahab_forward_lifecycle(u16 life_cycle, u32 *response);
+int ahab_write_fuse(u16 fuse_id, u32 fuse_val, bool lock, u32 *response);
+int ahab_read_common_fuse(u16 fuse_id, u32 *fuse_words, u32 fuse_num, u32 *response);
 
 #endif
diff --git a/drivers/misc/imx8ulp/s400_api.c b/drivers/misc/imx8ulp/s400_api.c
index 315221a463..d76a95febe 100644
--- a/drivers/misc/imx8ulp/s400_api.c
+++ b/drivers/misc/imx8ulp/s400_api.c
@@ -161,3 +161,84 @@ int ahab_forward_lifecycle(u16 life_cycle, u32 *response)
 
 	return ret;
 }
+
+int ahab_read_common_fuse(u16 fuse_id, u32 *fuse_words, u32 fuse_num, u32 *response)
+{
+	struct udevice *dev = gd->arch.s400_dev;
+	int size = sizeof(struct imx8ulp_s400_msg);
+	struct imx8ulp_s400_msg msg;
+	int ret;
+
+	if (!dev) {
+		printf("s400 dev is not initialized\n");
+		return -ENODEV;
+	}
+
+	if (!fuse_words) {
+		printf("Invalid parameters for fuse read\n");
+		return -EINVAL;
+	}
+
+	if ((fuse_id != 1 && fuse_num != 1) ||
+	    (fuse_id == 1 && fuse_num != 4)) {
+		printf("Invalid fuse number parameter\n");
+		return -EINVAL;
+	}
+
+	msg.version = AHAB_VERSION;
+	msg.tag = AHAB_CMD_TAG;
+	msg.size = 2;
+	msg.command = AHAB_READ_FUSE_REQ_CID;
+	msg.data[0] = fuse_id;
+
+	ret = misc_call(dev, false, &msg, size, &msg, size);
+	if (ret)
+		printf("Error: %s: ret %d, fuse_id 0x%x, response 0x%x\n",
+		       __func__, ret, fuse_id, msg.data[0]);
+
+	if (response)
+		*response = msg.data[0];
+
+	fuse_words[0] = msg.data[1];
+	if (fuse_id == 1) {
+		/* OTP_UNIQ_ID */
+		fuse_words[1] = msg.data[2];
+		fuse_words[2] = msg.data[3];
+		fuse_words[3] = msg.data[4];
+	}
+
+	return ret;
+}
+
+int ahab_write_fuse(u16 fuse_id, u32 fuse_val, bool lock, u32 *response)
+{
+	struct udevice *dev = gd->arch.s400_dev;
+	int size = sizeof(struct imx8ulp_s400_msg);
+	struct imx8ulp_s400_msg msg;
+	int ret;
+
+	if (!dev) {
+		printf("s400 dev is not initialized\n");
+		return -ENODEV;
+	}
+
+	msg.version = AHAB_VERSION;
+	msg.tag = AHAB_CMD_TAG;
+	msg.size = 3;
+	msg.command = AHAB_WRITE_FUSE_REQ_CID;
+	msg.data[0] = (32 << 16) | (fuse_id << 5);
+	if (lock)
+		msg.data[0] |= (1 << 31);
+
+	msg.data[1] = fuse_val;
+
+	ret = misc_call(dev, false, &msg, size, &msg, size);
+	if (ret)
+		printf("Error: %s: ret %d, fuse_id 0x%x, response 0x%x\n",
+		       __func__, ret, fuse_id, msg.data[0]);
+
+	if (response)
+		*response = msg.data[0];
+
+	return ret;
+}
-- 
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