ARM: Factor out reusable psci_cpu_entry

_sunxi_cpu_entry can be converted completely into a reusable
psci_cpu_entry. Tegra124 will use it as well.

As with psci_disable_smp, also the enabling is designed to be overloaded
in cased SMP is not controlled via ACTLR.

CC: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Tested-by: Ian Campbell <ijc@hellion.org.uk>
Signed-off-by: Tom Warren <twarren@nvidia.com>

arch/arm/cpu/armv7/psci.S

@@ -165,6 +165,15 @@ ENTRY(psci_disable_smp)
 ENDPROC(psci_disable_smp)
 .weak psci_disable_smp
 
+ENTRY(psci_enable_smp)
+	mrc	p15, 0, r0, c1, c0, 1		@ ACTLR
+	orr	r0, r0, #(1 << 6)		@ Set SMP bit
+	mcr	p15, 0, r0, c1, c0, 1		@ ACTLR
+	isb
+	bx	lr
+ENDPROC(psci_enable_smp)
+.weak psci_enable_smp
+
 ENTRY(psci_cpu_off_common)
 	push	{lr}
 
@@ -184,4 +193,18 @@ ENTRY(psci_cpu_off_common)
 	bx	lr
 ENDPROC(psci_cpu_off_common)
 
+ENTRY(psci_cpu_entry)
+	bl	psci_enable_smp
+
+	bl	_nonsec_init
+
+	adr	r0, _psci_target_pc
+	ldr	r0, [r0]
+	b	_do_nonsec_entry
+ENDPROC(psci_cpu_entry)
+
+.globl _psci_target_pc
+_psci_target_pc:
+	.word	0
+
 	.popsection

arch/arm/cpu/armv7/sunxi/psci.S

@@ -139,7 +139,7 @@ out:	mcr	p15, 0, r7, c1, c1, 0
 	@ r2 = target PC
 .globl	psci_cpu_on
 psci_cpu_on:
-	adr	r0, _target_pc
+	ldr	r0, =_psci_target_pc
 	str	r2, [r0]
 	dsb
 
@@ -151,7 +151,7 @@ psci_cpu_on:
 	mov	r4, #1
 	lsl	r4, r4, r1
 
-	adr	r6, _sunxi_cpu_entry
+	ldr	r6, =psci_cpu_entry
 	str	r6, [r0, #0x1a4] @ PRIVATE_REG (boot vector)
 
 	@ Assert reset on target CPU
@@ -197,22 +197,6 @@ psci_cpu_on:
 	mov	r0, #ARM_PSCI_RET_SUCCESS	@ Return PSCI_RET_SUCCESS
 	mov	pc, lr
 
-_target_pc:
-	.word	0
-
-_sunxi_cpu_entry:
-	@ Set SMP bit
-	mrc	p15, 0, r0, c1, c0, 1
-	orr	r0, r0, #0x40
-	mcr	p15, 0, r0, c1, c0, 1
-	isb
-
-	bl	_nonsec_init
-
-	adr	r0, _target_pc
-	ldr	r0, [r0]
-	b	_do_nonsec_entry
-
 .globl	psci_cpu_off
 psci_cpu_off:
 	bl	psci_cpu_off_common