cpuidle: exynos: add coupled cpuidle support for exynos4210
The following patch adds coupled cpuidle support for Exynos4210 to
an existing cpuidle-exynos driver. As a result it enables AFTR mode
to be used by default on Exynos4210 without the need to hot unplug
CPU1 first.
The patch is heavily based on earlier cpuidle-exynos4210 driver from
Daniel Lezcano:
http://www.spinics.net/lists/linux-samsung-soc/msg28134.html
Changes from Daniel's code include:
- porting code to current kernels
- fixing it to work on my setup (by using S5P_INFORM register
instead of S5P_VA_SYSRAM one on Revison 1.1 and retrying poking
CPU1 out of the BOOT ROM if necessary)
- fixing rare lockup caused by waiting for CPU1 to get stuck in
the BOOT ROM (CPU hotplug code in arch/arm/mach-exynos/platsmp.c
doesn't require this and works fine)
- moving Exynos specific code to arch/arm/mach-exynos/pm.c
- using cpu_boot_reg_base() helper instead of BOOT_VECTOR macro
- using exynos_cpu_*() helpers instead of accessing registers
directly
- using arch_send_wakeup_ipi_mask() instead of dsb_sev()
(this matches CPU hotplug code in arch/arm/mach-exynos/platsmp.c)
- integrating separate exynos4210-cpuidle driver into existing
exynos-cpuidle one
Cc: Colin Cross <ccross@google.com>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Tomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>
diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
index 865f878..f70eca7 100644
--- a/arch/arm/mach-exynos/common.h
+++ b/arch/arm/mach-exynos/common.h
@@ -13,6 +13,7 @@
#define __ARCH_ARM_MACH_EXYNOS_COMMON_H
#include <linux/of.h>
+#include <linux/platform_data/cpuidle-exynos.h>
#define EXYNOS3250_SOC_ID 0xE3472000
#define EXYNOS3_SOC_MASK 0xFFFFF000
@@ -150,8 +151,11 @@
extern int exynos_pm_central_resume(void);
extern void exynos_enter_aftr(void);
+extern struct cpuidle_exynos_data cpuidle_coupled_exynos_data;
+
extern void s5p_init_cpu(void __iomem *cpuid_addr);
extern unsigned int samsung_rev(void);
+extern void __iomem *cpu_boot_reg_base(void);
static inline void pmu_raw_writel(u32 val, u32 offset)
{