1 files changed, 82 insertions, 0 deletions
diff --git a/arch/arm/mach-socfpga/smc_api.c b/arch/arm/mach-socfpga/smc_api.c
new file mode 100644
index 00000000000..b212a94b321
--- /dev/null
+++ b/arch/arm/mach-socfpga/smc_api.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Intel Corporation <www.intel.com>
+ * Copyright (C) 2025 Altera Corporation <www.altera.com>
+ *
+ */
+
+#include <cpu_func.h>
+#include <asm/ptrace.h>
+#include <asm/system.h>
+#include <linux/errno.h>
+#include <linux/intel-smc.h>
+#include <linux/string.h>
+
+int invoke_smc(u32 func_id, u64 *args, int arg_len, u64 *ret_arg, int ret_len)
+{
+	struct pt_regs regs;
+
+	memset(&regs, 0, sizeof(regs));
+	regs.regs[0] = func_id;
+
+	if (args)
+		memcpy(&regs.regs[1], args, arg_len * sizeof(*args));
+
+	smc_call(&regs);
+
+	if (ret_arg)
+		memcpy(ret_arg, &regs.regs[1], ret_len * sizeof(*ret_arg));
+
+	return regs.regs[0];
+}
+
+int smc_send_mailbox(u32 cmd, u32 len, u32 *arg, u8 urgent, u32 *resp_buf_len,
+		     u32 *resp_buf)
+{
+	int ret;
+	u64 args[6];
+	u64 resp[3];
+
+	args[0] = cmd;
+	args[1] = (u64)arg;
+	args[2] = len;
+	args[3] = urgent;
+	args[4] = (u64)resp_buf;
+
+	if (arg && len > 0)
+		flush_dcache_range((uintptr_t)arg, (uintptr_t)arg + len);
+
+	if (resp_buf && resp_buf_len && *resp_buf_len > 0) {
+		args[5] = *resp_buf_len;
+		flush_dcache_range((uintptr_t)resp_buf, (uintptr_t)resp_buf + *resp_buf_len);
+	} else {
+		args[5] = 0;
+	}
+
+	ret = invoke_smc(INTEL_SIP_SMC_MBOX_SEND_CMD, args, ARRAY_SIZE(args),
+			 resp, ARRAY_SIZE(resp));
+
+	if (ret == INTEL_SIP_SMC_STATUS_OK && resp_buf && resp_buf_len) {
+		if (!resp[0])
+			*resp_buf_len = resp[1];
+	}
+
+	return (int)resp[0];
+}
+
+int smc_get_usercode(u32 *usercode)
+{
+	int ret;
+	u64 resp;
+
+	if (!usercode)
+		return -EINVAL;
+
+	ret = invoke_smc(INTEL_SIP_SMC_GET_USERCODE, NULL, 0,
+			 &resp, 1);
+
+	if (ret == INTEL_SIP_SMC_STATUS_OK)
+		*usercode = (u32)resp;
+
+	return ret;
+}