ARM: pm: add generic CPU suspend/resume support

This adds core support for saving and restoring CPU coprocessor
registers for suspend/resume support.  This contains support for suspend
with ARM920, ARM926, SA11x0, PXA25x, PXA27x, PXA3xx, V6 and V7 CPUs.
Tested on Assabet and Tegra 2.

Tested-by: Colin Cross <ccross@android.com>
Tested-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 10 insertions, 0 deletions

diff --git a/arch/arm/include/asm/glue-proc.h b/arch/arm/include/asm/glue-proc.h
index e3bf443f2d18..6469521d092f 100644
--- a/arch/arm/include/asm/glue-proc.h
+++ b/arch/arm/include/asm/glue-proc.h
@@ -256,6 +256,9 @@
 #define cpu_dcache_clean_area           __glue(CPU_NAME,_dcache_clean_area)
 #define cpu_do_switch_mm                __glue(CPU_NAME,_switch_mm)
 #define cpu_set_pte_ext                 __glue(CPU_NAME,_set_pte_ext)
+#define cpu_suspend_size                __glue(CPU_NAME,_suspend_size)
+#define cpu_do_suspend                  __glue(CPU_NAME,_do_suspend)
+#define cpu_do_resume                   __glue(CPU_NAME,_do_resume)
 #endif
 
 #endif
diff --git a/arch/arm/include/asm/proc-fns.h b/arch/arm/include/asm/proc-fns.h
index 69802150be22..8ec535e11fd7 100644
--- a/arch/arm/include/asm/proc-fns.h
+++ b/arch/arm/include/asm/proc-fns.h
@@ -66,6 +66,11 @@ extern struct processor {
          * ignore 'ext'.
          */
         void (*set_pte_ext)(pte_t *ptep, pte_t pte, unsigned int ext);
+
+        /* Suspend/resume */
+        unsigned int suspend_size;
+        void (*do_suspend)(void *);
+        void (*do_resume)(void *);
 } processor;
 
 #ifndef MULTI_CPU
@@ -86,6 +91,8 @@ extern void cpu_reset(unsigned long addr) __attribute__((noreturn));
 #define cpu_do_switch_mm(pgd,mm)        processor.switch_mm(pgd,mm)
 #endif
 
+extern void cpu_resume(void);
+
 #include <asm/memory.h>
 
 #ifdef CONFIG_MMU