ARM: shmobile: Rework sh7372 sleep code to use virt_to_phys()

Instead of having a hard coded virt-to-phys address
conversion code in sleep-sh7372.S, rework the code
to do the conversion in C using virt_to_phys().

This removes the need for PLAT_PHYS_OFFSET which
in turn is needed for ARCH_MULTIPLATFORM.
Signed-off-by: Magnus Damm <damm@opensource.se>
[horms+renesas@verge.net.au: squashed in build fix posted as
 "ARM: shmobile: sh7372 build fix for SUSPEND=n && CPU_IDLE=n"]
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/mach-shmobile/include/mach/sh7372.h

@@ -75,6 +75,8 @@ extern void sh7372_intcs_resume(void);
 extern void sh7372_intca_suspend(void);
 extern void sh7372_intca_resume(void);
 
+extern unsigned long sh7372_cpu_resume;
+
 #ifdef CONFIG_PM
 extern void __init sh7372_init_pm_domains(void);
 #else

arch/arm/mach-shmobile/pm-sh7372.c

@@ -351,6 +351,9 @@ static void sh7372_enter_a4s_common(int pllc0_on)
 
 static void sh7372_pm_setup_smfram(void)
 {
+	/* pass physical address of cpu_resume() to assembly resume code */
+	sh7372_cpu_resume = virt_to_phys(cpu_resume);
+
 	memcpy((void *)SMFRAM, sh7372_resume_core_standby_sysc, 0x100);
 }
 #else

arch/arm/mach-shmobile/sleep-sh7372.S

@@ -40,7 +40,10 @@
 	.global sh7372_resume_core_standby_sysc
 sh7372_resume_core_standby_sysc:
 	ldr     pc, 1f
-1:	.long   cpu_resume - PAGE_OFFSET + PLAT_PHYS_OFFSET
+
+	.globl	sh7372_cpu_resume
+sh7372_cpu_resume:
+1:	.space	4
 
 #define SPDCR 0xe6180008