ARM: 7818/1: feroceon: Add suspend/resume operation

Add support for suspend/resume operations. The implemented procedures
are identical to the ones for ARM926.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 27 insertions, 1 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 32506dfa5e73..57562f8d1f92 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -2240,7 +2240,7 @@ source "kernel/power/Kconfig"
 
 config ARCH_SUSPEND_POSSIBLE
         depends on !ARCH_S5PC100
-        depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
+        depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
                 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
         def_bool y
 
diff --git a/arch/arm/mm/proc-feroceon.S b/arch/arm/mm/proc-feroceon.S
index d5146b98c8d1..db79b62c92fb 100644
--- a/arch/arm/mm/proc-feroceon.S
+++ b/arch/arm/mm/proc-feroceon.S
@@ -514,6 +514,32 @@ ENTRY(cpu_feroceon_set_pte_ext)
 #endif
         mov     pc, lr
 
+/* Suspend/resume support: taken from arch/arm/mm/proc-arm926.S */
+.globl  cpu_feroceon_suspend_size
+.equ    cpu_feroceon_suspend_size, 4 * 3
+#ifdef CONFIG_ARM_CPU_SUSPEND
+ENTRY(cpu_feroceon_do_suspend)
+        stmfd   sp!, {r4 - r6, lr}
+        mrc     p15, 0, r4, c13, c0, 0  @ PID
+        mrc     p15, 0, r5, c3, c0, 0   @ Domain ID
+        mrc     p15, 0, r6, c1, c0, 0   @ Control register
+        stmia   r0, {r4 - r6}
+        ldmfd   sp!, {r4 - r6, pc}
+ENDPROC(cpu_feroceon_do_suspend)
+
+ENTRY(cpu_feroceon_do_resume)
+        mov     ip, #0
+        mcr     p15, 0, ip, c8, c7, 0   @ invalidate I+D TLBs
+        mcr     p15, 0, ip, c7, c7, 0   @ invalidate I+D caches
+        ldmia   r0, {r4 - r6}
+        mcr     p15, 0, r4, c13, c0, 0  @ PID
+        mcr     p15, 0, r5, c3, c0, 0   @ Domain ID
+        mcr     p15, 0, r1, c2, c0, 0   @ TTB address
+        mov     r0, r6                  @ control register
+        b       cpu_resume_mmu
+ENDPROC(cpu_feroceon_do_resume)
+#endif
+
         .type   __feroceon_setup, #function
 __feroceon_setup:
         mov     r0, #0