ARM: adjust arm-smccc code for use in U-Boot

Adjust ARM SMC Calling Convention code for U-Boot:
  - Replace the license block with SPDX
  - Change path to asm-offsets.h
  - Define UNWIND() as no-op
  - Add Kconfig entry
  - Add asm-offsets

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/arm/Kconfig

@@ -174,6 +174,14 @@ config SYS_CACHELINE_SIZE
 	default 64 if SYS_CACHE_SHIFT_6
 	default 32 if SYS_CACHE_SHIFT_5
 
+config ARM_SMCCC
+	bool "Support for ARM SMC Calling Convention (SMCCC)"
+	depends on CPU_V7 || ARM64
+	help
+	  Say Y here if you want to enable ARM SMC Calling Convention.
+	  This should be enabled if U-Boot needs to communicate with system
+	  firmware (for example, PSCI) according to SMCCC.
+
 config SEMIHOSTING
 	bool "support boot from semihosting"
 	help

arch/arm/cpu/armv7/Makefile

@@ -18,6 +18,7 @@ obj-y	+= lowlevel_init.o
 endif
 endif
 
+obj-$(CONFIG_ARM_SMCCC)		+= smccc-call.o
 obj-$(CONFIG_ARMV7_NONSEC)	+= nonsec_virt.o virt-v7.o virt-dt.o
 obj-$(CONFIG_ARMV7_PSCI)	+= psci.o psci-common.o
 

arch/arm/cpu/armv7/smccc-call.S

@@ -1,22 +1,14 @@
 /*
  * Copyright (c) 2015, Linaro Limited
  *
- * This software is licensed under the terms of the GNU General Public
+ * SPDX-License-Identifier:	GPL-2.0
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
  */
 #include <linux/linkage.h>
 
 #include <asm/opcodes-sec.h>
 #include <asm/opcodes-virt.h>
-#include <asm/unwind.h>
 
+#define UNWIND(x...)
 	/*
 	 * Wrap c macros in asm macros to delay expansion until after the
 	 * SMCCC asm macro is expanded.

arch/arm/cpu/armv8/Makefile

@@ -16,6 +16,8 @@ obj-y	+= tlb.o
 obj-y	+= transition.o
 obj-y	+= fwcall.o
 obj-y	+= cpu-dt.o
+obj-$(CONFIG_ARM_SMCCC)		+= smccc-call.o
+
 ifndef CONFIG_SPL_BUILD
 obj-$(CONFIG_ARMV8_SPIN_TABLE) += spin_table.o spin_table_v8.o
 endif

arch/arm/cpu/armv8/smccc-call.S

@@ -1,19 +1,11 @@
 /*
  * Copyright (c) 2015, Linaro Limited
  *
- * This program is free software; you can redistribute it and/or modify
+ * SPDX-License-Identifier:	GPL-2.0
- * it under the terms of the GNU General Public License Version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
  */
 #include <linux/linkage.h>
 #include <linux/arm-smccc.h>
-#include <asm/asm-offsets.h>
+#include <generated/asm-offsets.h>
 
 	.macro SMCCC instr
 	.cfi_startproc

arch/arm/include/asm/opcodes-sec.h

@@ -1,14 +1,7 @@
 /*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
  * Copyright (C) 2012 ARM Limited
+ *
+ * SPDX-License-Identifier:	GPL-2.0
  */
 
 #ifndef __ASM_ARM_OPCODES_SEC_H

arch/arm/include/asm/opcodes-virt.h

@@ -2,19 +2,7 @@
  * opcodes-virt.h: Opcode definitions for the ARM virtualization extensions
  * Copyright (C) 2012  Linaro Limited
  *
- * This program is free software; you can redistribute it and/or modify
+ * SPDX-License-Identifier:	GPL-2.0+
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 #ifndef __ASM_ARM_OPCODES_VIRT_H
 #define __ASM_ARM_OPCODES_VIRT_H

arch/arm/include/asm/opcodes.h

@@ -1,9 +1,7 @@
 /*
  *  arch/arm/include/asm/opcodes.h
  *
- * This program is free software; you can redistribute it and/or modify
+ * SPDX-License-Identifier:	GPL-2.0
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 
 #ifndef __ASM_ARM_OPCODES_H

arch/arm/lib/asm-offsets.c

@@ -14,6 +14,7 @@
 
 #include <common.h>
 #include <linux/kbuild.h>
+#include <linux/arm-smccc.h>
 
 #if defined(CONFIG_MX25) || defined(CONFIG_MX27) || defined(CONFIG_MX35) \
 	|| defined(CONFIG_MX51) || defined(CONFIG_MX53)
@@ -198,5 +199,12 @@ int main(void)
 	DEFINE(PLL_DP_HFS_MFN, offsetof(struct dpll, dp_hfs_mfn));
 #endif
 
+#ifdef CONFIG_ARM_SMCCC
+	DEFINE(ARM_SMCCC_RES_X0_OFFS, offsetof(struct arm_smccc_res, a0));
+	DEFINE(ARM_SMCCC_RES_X2_OFFS, offsetof(struct arm_smccc_res, a2));
+	DEFINE(ARM_SMCCC_QUIRK_ID_OFFS, offsetof(struct arm_smccc_quirk, id));
+	DEFINE(ARM_SMCCC_QUIRK_STATE_OFFS, offsetof(struct arm_smccc_quirk, state));
+#endif
+
 	return 0;
 }

include/linux/arm-smccc.h

@@ -1,15 +1,7 @@
 /*
  * Copyright (c) 2015, Linaro Limited
  *
- * This software is licensed under the terms of the GNU General Public
+ * SPDX-License-Identifier:	GPL-2.0
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
  */
 #ifndef __LINUX_ARM_SMCCC_H
 #define __LINUX_ARM_SMCCC_H