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>
diff --git a/arch/arm/mm/proc-sa1100.S b/arch/arm/mm/proc-sa1100.S
index 2ac4e6f..74483d1 100644
--- a/arch/arm/mm/proc-sa1100.S
+++ b/arch/arm/mm/proc-sa1100.S
@@ -169,6 +169,42 @@
#endif
mov pc, lr
+.globl cpu_sa1100_suspend_size
+.equ cpu_sa1100_suspend_size, 4*4
+#ifdef CONFIG_PM
+ENTRY(cpu_sa1100_do_suspend)
+ stmfd sp!, {r4 - r7, lr}
+ mrc p15, 0, r4, c3, c0, 0 @ domain ID
+ mrc p15, 0, r5, c2, c0, 0 @ translation table base addr
+ mrc p15, 0, r6, c13, c0, 0 @ PID
+ mrc p15, 0, r7, c1, c0, 0 @ control reg
+ stmia r0, {r4 - r7} @ store cp regs
+ ldmfd sp!, {r4 - r7, pc}
+ENDPROC(cpu_sa1100_do_suspend)
+
+ENTRY(cpu_sa1100_do_resume)
+ ldmia r0, {r4 - r7} @ load cp regs
+ mov r1, #0
+ mcr p15, 0, r1, c8, c7, 0 @ flush I+D TLBs
+ mcr p15, 0, r1, c7, c7, 0 @ flush I&D cache
+ mcr p15, 0, r1, c9, c0, 0 @ invalidate RB
+ mcr p15, 0, r1, c9, c0, 5 @ allow user space to use RB
+
+ mcr p15, 0, r4, c3, c0, 0 @ domain ID
+ mcr p15, 0, r5, c2, c0, 0 @ translation table base addr
+ mcr p15, 0, r6, c13, c0, 0 @ PID
+ mov r0, r7 @ control register
+ mov r2, r5, lsr #14 @ get TTB0 base
+ mov r2, r2, lsl #14
+ ldr r3, =PMD_TYPE_SECT | PMD_SECT_BUFFERABLE | \
+ PMD_SECT_CACHEABLE | PMD_SECT_AP_WRITE
+ b cpu_resume_mmu
+ENDPROC(cpu_sa1100_do_resume)
+#else
+#define cpu_sa1100_do_suspend 0
+#define cpu_sa1100_do_resume 0
+#endif
+
__CPUINIT
.type __sa1100_setup, #function
@@ -218,6 +254,9 @@
.word cpu_sa1100_dcache_clean_area
.word cpu_sa1100_switch_mm
.word cpu_sa1100_set_pte_ext
+ .word cpu_sa1100_suspend_size
+ .word cpu_sa1100_do_suspend
+ .word cpu_sa1100_do_resume
.size sa1100_processor_functions, . - sa1100_processor_functions
.section ".rodata"