ARM: shmobile: Add SCU boot function using argument

Add a shmoible_boot_scu function that assumes that the base address
of the SCU is passed in r0. This code is free from inline virtual
to physical address conversion.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

2 files changed, 14 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/headsmp-scu.S b/arch/arm/mach-shmobile/headsmp-scu.S
index 7d113f898e7f..c5c9106bf6c4 100644
--- a/arch/arm/mach-shmobile/headsmp-scu.S
+++ b/arch/arm/mach-shmobile/headsmp-scu.S
@@ -51,6 +51,19 @@ ENTRY(shmobile_secondary_vector_scu)
 2:      .long shmobile_scu_base - PAGE_OFFSET + PLAT_PHYS_OFFSET
 ENDPROC(shmobile_secondary_vector_scu)
 
+ENTRY(shmobile_boot_scu)
+                                        @ r0 = SCU base address
+        mrc     p15, 0, r1, c0, c0, 5   @ read MIPDR
+        and     r1, r1, #3              @ mask out cpu ID
+        lsl     r1, r1, #3              @ we will shift by cpu_id * 8 bits
+        ldr     r2, [r0, #8]            @ SCU Power Status Register
+        mov     r3, #3
+        bic     r2, r2, r3, lsl r1      @ Clear bits of our CPU (Run Mode)
+        str     r2, [r0, #8]            @ write back
+
+        b       shmobile_invalidate_start
+ENDPROC(shmobile_boot_scu)
+
         .text
         .globl  shmobile_scu_base
 shmobile_scu_base:
diff --git a/arch/arm/mach-shmobile/include/mach/common.h b/arch/arm/mach-shmobile/include/mach/common.h
index 54472ef4a270..8ef1c3c13ea8 100644
--- a/arch/arm/mach-shmobile/include/mach/common.h
+++ b/arch/arm/mach-shmobile/include/mach/common.h
@@ -11,6 +11,7 @@ extern void shmobile_boot_vector(void);
 extern unsigned long shmobile_boot_fn;
 extern unsigned long shmobile_boot_arg;
 extern void shmobile_secondary_vector_scu(void);
+extern void shmobile_boot_scu(void);
 struct clk;
 extern int shmobile_clk_init(void);
 extern void shmobile_handle_irq_intc(struct pt_regs *);