stm32mp1: bsec: access with SMC for trusted boot

As BSEC is secure aware, all register access need to be done
by TF-A for TRUSTED boot chain, when U-Boot is executed in
normal world.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>

arch/arm/mach-stm32mp/include/mach/stm32mp1_smc.h

@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */
+/*
+ * Copyright (C) 2019, STMicroelectronics - All Rights Reserved
+ */
+
+#ifndef __STM32MP1_SMC_H__
+#define __STM32MP1_SMC_H__
+
+#include <linux/arm-smccc.h>
+
+/*
+ * SMC function IDs for STM32 Service queries
+ * STM32 SMC services use the space between 0x82000000 and 0x8200FFFF
+ * like this is defined in SMC calling Convention by ARM
+ * for SiP (silicon Partner)
+ * http://infocenter.arm.com/help/topic/com.arm.doc.den0028a/index.html
+ */
+#define STM32_SMC_VERSION		0x82000000
+
+/* Secure Service access from Non-secure */
+#define STM32_SMC_BSEC			0x82001003
+
+/* Service for BSEC */
+#define STM32_SMC_READ_SHADOW		0x01
+#define STM32_SMC_PROG_OTP		0x02
+#define STM32_SMC_WRITE_SHADOW		0x03
+#define STM32_SMC_READ_OTP		0x04
+#define STM32_SMC_READ_ALL		0x05
+#define STM32_SMC_WRITE_ALL		0x06
+
+/* SMC error codes */
+#define STM32_SMC_OK			0x0
+#define STM32_SMC_NOT_SUPPORTED		-1
+#define STM32_SMC_FAILED		-2
+#define STM32_SMC_INVALID_PARAMS	-3
+
+#define stm32_smc_exec(svc, op, data1, data2) \
+	stm32_smc(svc, op, data1, data2, NULL)
+
+#ifdef CONFIG_ARM_SMCCC
+static inline u32 stm32_smc(u32 svc, u8 op, u32 data1, u32 data2, u32 *result)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_smc(svc, op, data1, data2, 0, 0, 0, 0, &res);
+
+	if (res.a0) {
+		pr_err("%s: Failed to exec in secure mode (err = %ld)\n",
+		       __func__, res.a0);
+		return -EINVAL;
+	}
+	if (result)
+		*result = (u32)res.a1;
+
+	return 0;
+}
+#else
+static inline u32 stm32_smc(u32 svc, u8 op, u32 data1, u32 data2, u32 *result)
+{
+	return 0;
+}
+#endif
+
+#endif /* __STM32MP1_SMC_H__ */