ARM: keystone: Move CPU bringup code to dedicated asm file

Because of inline asm usage in platsmp.c, smc instruction
creates build failure for ARM V6+V7 build where as using instruction
encoding for smc breaks the thumb2 build.

So move the code snippet to separate asm file and mark
it with 'armv7-a$(plus_sec)' to avoid any build issues.

Signed-off-by: Santosh Shilimkar <[e-mail]>
Signed-off-by: Arnd Bergmann <[e-mail]>

arch/arm/mach-keystone/Makefile

···
-obj-y					:= keystone.o
+obj-y					:= keystone.o smc.o
+
+plus_sec := $(call as-instr,.arch_extension sec,+sec)
+AFLAGS_smc.o				:=-Wa,-march=armv7-a$(plus_sec)
+
 obj-$(CONFIG_SMP)			+= platsmp.o

arch/arm/mach-keystone/keystone.h

···
 #ifndef __KEYSTONE_H__
 #define __KEYSTONE_H__
 
+#define KEYSTONE_MON_CPU_UP_IDX		0x00
+
+#ifndef __ASSEMBLER__
+
 extern struct smp_operations keystone_smp_ops;
 extern void secondary_startup(void);
+extern u32 keystone_cpu_smc(u32 command, u32 cpu, u32 addr);
 
+#endif /* __ASSEMBLER__ */
 #endif /* __KEYSTONE_H__ */

arch/arm/mach-keystone/platsmp.c

···
 	pr_debug("keystone-smp: booting cpu %d, vector %08lx\n",
 		 cpu, start);
 
-	asm volatile (
-		"mov    r0, #0\n"	/* power on cmd	*/
-		"mov    r1, %1\n"	/* cpu		*/
-		"mov    r2, %2\n"	/* start	*/
-		".inst  0xe1600070\n"	/* smc #0	*/
-		"mov    %0, r0\n"
-		: "=r" (error)
-		: "r"(cpu), "r"(start)
-		: "cc", "r0", "r1", "r2", "memory"
-	);
-
-	pr_debug("keystone-smp: monitor returned %d\n", error);
+	error = keystone_cpu_smc(KEYSTONE_MON_CPU_UP_IDX, cpu, start);
+	if (error)
+		pr_err("CPU %d bringup failed with %d\n", cpu, error);
 
 	return error;
 }

arch/arm/mach-keystone/smc.S

···
+/*
+ * Keystone Secure APIs
+ *
+ * Copyright (C) 2013 Texas Instruments, Inc.
+ * 	Santosh Shilimkar <[e-mail]>
+ *
+ * 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.
+ */
+
+#include <linux/linkage.h>
+
+/**
+ * u32 keystone_cpu_smc(u32 command, u32 cpu, u32 addr)
+ *
+ * Low level CPU monitor API
+ * @command:	Monitor command.
+ * @cpu:	CPU Number
+ * @addr:	Kernel jump address for boot CPU
+ *
+ * Return: Non zero value on failure
+ */
+ENTRY(keystone_cpu_smc)
+	stmfd   sp!, {r4-r12, lr}
+	smc	#0
+	dsb
+	ldmfd   sp!, {r4-r12, pc}
+ENDPROC(keystone_cpu_smc)