From ed5f2e5bed91b6daa4f051b5e11efbaebfec9cb1 Mon Sep 17 00:00:00 2001
From: Harsha Vardhan V M <h-vm@ti.com>
Date: Wed, 19 Mar 2025 14:17:13 +0530
Subject: drivers: k3_fuse: Add fuse sub-system func calls

Add K3_FUSE config option to add and enable fuse sub-system
implementation function calls.

Signed-off-by: Harsha Vardhan V M <h-vm@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
---
 drivers/misc/k3_fuse.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 drivers/misc/k3_fuse.c

(limited to 'drivers/misc/k3_fuse.c')

diff --git a/drivers/misc/k3_fuse.c b/drivers/misc/k3_fuse.c
new file mode 100644
index 00000000000..4a8ff1f2523
--- /dev/null
+++ b/drivers/misc/k3_fuse.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2025 Texas Instruments Incorporated, <www.ti.com>
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <fuse.h>
+#include <linux/arm-smccc.h>
+#include <string.h>
+
+#define K3_SIP_OTP_WRITEBUFF 0xC2000000
+#define K3_SIP_OTP_WRITE 0xC2000001
+#define K3_SIP_OTP_READ 0xC2000002
+
+int fuse_read(u32 bank, u32 word, u32 *val)
+{
+	struct arm_smccc_res res;
+
+	if (bank != 0U) {
+		printf("Invalid bank argument, ONLY bank 0 is supported\n");
+		return -EINVAL;
+	}
+
+	/* Make SiP SMC call and send the word in the parameter register */
+	arm_smccc_smc(K3_SIP_OTP_READ, word,
+		      0, 0, 0, 0, 0, 0, &res);
+
+	*val = res.a1;
+	if (res.a0 != 0)
+		printf("SMC call failed: Error code %lu\n", res.a0);
+
+	return res.a0;
+}
+
+int fuse_sense(u32 bank, u32 word, u32 *val)
+{
+	return -EPERM;
+}
+
+int fuse_prog(u32 bank, u32 word, u32 val)
+{
+	struct arm_smccc_res res;
+	u32 mask = val;
+
+	if (bank != 0U) {
+		printf("Invalid bank argument, ONLY bank 0 is supported\n");
+		return -EINVAL;
+	}
+
+	/* Make SiP SMC call and send the word, val and mask in the parameter register */
+	arm_smccc_smc(K3_SIP_OTP_WRITE, word,
+		      val, mask, 0, 0, 0, 0, &res);
+
+	if (res.a0 != 0)
+		printf("SMC call failed: Error code %lu\n", res.a0);
+
+	return res.a0;
+}
+
+int fuse_override(u32 bank, u32 word, u32 val)
+{
+	return -EPERM;
+}
+
+int fuse_writebuff(ulong addr)
+{
+	struct arm_smccc_res res;
+
+	/* Make SiP SMC call and send the addr in the parameter register */
+	arm_smccc_smc(K3_SIP_OTP_WRITEBUFF, (unsigned long)addr,
+		      0, 0, 0, 0, 0, 0, &res);
+
+	if (res.a0 != 0)
+		printf("SMC call failed: Error code %lu\n", res.a0);
+
+	return res.a0;
+}
-- 
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