diff options
| author | Tomasz Figa <t.figa@samsung.com> | 2014-09-23 20:24:39 +0400 |
|---|---|---|
| committer | Kukjin Kim <kgene.kim@samsung.com> | 2014-10-20 19:06:35 +0400 |
| commit | 2b9d9c321b5900c7ce82110a81cf3827ca9b33c6 (patch) | |
| tree | 6809b6da0bdbef8b2ddabf52c6dabc5ad6afdd9a /arch/arm/mach-exynos/sleep.S | |
| parent | 9c261f89a30010a33c15e6b7cfc7c79ae6bea653 (diff) | |
| download | linux-2b9d9c321b5900c7ce82110a81cf3827ca9b33c6.tar.xz | |
ARM: EXYNOS: Add support for firmware-assisted suspend/resume
On a numer of Exynos-based boards Linux kernel is running in non-secure
mode under a secure firmware. This means that certain operations need to
be handled in special way, with firmware assistance. System-wide
suspend/resume is an example of such operations.
This patch adds support for firmware-assisted suspend/resume by
leveraging recently introduced suspend and resume firmware operations
and modifying existing suspend/resume paths to account for presence of
secure firmware.
Signed-off-by: Tomasz Figa <t.figa@samsung.com>
[kgene.kim@samsung.com: rebased]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Diffstat (limited to 'arch/arm/mach-exynos/sleep.S')
| -rw-r--r-- | arch/arm/mach-exynos/sleep.S | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/arm/mach-exynos/sleep.S b/arch/arm/mach-exynos/sleep.S index 108a45f4bb62..e3c373082bbe 100644 --- a/arch/arm/mach-exynos/sleep.S +++ b/arch/arm/mach-exynos/sleep.S @@ -16,6 +16,7 @@ */ #include <linux/linkage.h> +#include "smc.h" #define CPU_MASK 0xff0ffff0 #define CPU_CORTEX_A9 0x410fc090 @@ -55,3 +56,30 @@ ENTRY(exynos_cpu_resume) #endif b cpu_resume ENDPROC(exynos_cpu_resume) + + .align + +ENTRY(exynos_cpu_resume_ns) + mrc p15, 0, r0, c0, c0, 0 + ldr r1, =CPU_MASK + and r0, r0, r1 + ldr r1, =CPU_CORTEX_A9 + cmp r0, r1 + bne skip_cp15 + + adr r0, cp15_save_power + ldr r1, [r0] + adr r0, cp15_save_diag + ldr r2, [r0] + mov r0, #SMC_CMD_C15RESUME + dsb + smc #0 +skip_cp15: + b cpu_resume +ENDPROC(exynos_cpu_resume_ns) + .globl cp15_save_diag +cp15_save_diag: + .long 0 @ cp15 diagnostic + .globl cp15_save_power +cp15_save_power: + .long 0 @ cp15 power control |