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Subject[PATCH v3 07/12] ARM: EXYNOS: Add support for mapping PMU base address via DT
Date
From: Young-Gun Jang <yg1004.jang@samsung.com>

Add support for mapping Samsung Power Management Unit (PMU)
base address from device tree. This patch also adds helper
function as "get_exynos_pmuregmap". This function can be used
by other machine files such as "pm.c", "hotplug.c" for accessing
PMU regmap handle.

Signed-off-by: Young-Gun Jang <yg1004.jang@samsung.com>
Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
---
arch/arm/mach-exynos/Kconfig | 2 ++
arch/arm/mach-exynos/common.h | 2 ++
arch/arm/mach-exynos/exynos.c | 39 +++++++++++++++++++++++++++++++++++++++
3 files changed, 43 insertions(+)

diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index fc8bf18..2f60c90 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -26,6 +26,7 @@ config ARCH_EXYNOS4
select PINCTRL
select PM_GENERIC_DOMAINS if PM_RUNTIME
select S5P_DEV_MFC
+ select MFD_SYSCON
help
Samsung EXYNOS4 SoCs based systems

@@ -36,6 +37,7 @@ config ARCH_EXYNOS5
select HAVE_ARM_SCU if SMP
select HAVE_SMP
select PINCTRL
+ select MFD_SYSCON
help
Samsung EXYNOS5 (Cortex-A15) SoC based systems

diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
index 8a4aa0b..33a2bee 100644
--- a/arch/arm/mach-exynos/common.h
+++ b/arch/arm/mach-exynos/common.h
@@ -55,4 +55,6 @@ struct exynos_pmu_conf {
extern void exynos_sys_powerdown_conf(enum sys_powerdown mode);
extern void exynos_enter_aftr(void);

+extern struct regmap *get_exynos_pmuregmap(void);
+
#endif /* __ARCH_ARM_MACH_EXYNOS_COMMON_H */
diff --git a/arch/arm/mach-exynos/exynos.c b/arch/arm/mach-exynos/exynos.c
index a7b45db..9045fd6 100644
--- a/arch/arm/mach-exynos/exynos.c
+++ b/arch/arm/mach-exynos/exynos.c
@@ -19,6 +19,7 @@
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
+#include <linux/mfd/syscon.h>

#include <asm/cacheflush.h>
#include <asm/hardware/cache-l2x0.h>
@@ -36,6 +37,8 @@
#define L2_AUX_VAL 0x7C470001
#define L2_AUX_MASK 0xC200ffff

+static struct regmap *exynos_pmu_regmap;
+
static struct map_desc exynos4_iodesc[] __initdata = {
{
.virtual = (unsigned long)S3C_VA_SYS,
@@ -260,6 +263,14 @@ static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
return 1;
}

+static const struct of_device_id exynos_dt_pmu_match[] = {
+ { .compatible = "samsung,exynos4210-pmu" },
+ { .compatible = "samsung,exynos4212-pmu" },
+ { .compatible = "samsung,exynos4412-pmu" },
+ { .compatible = "samsung,exynos5250-pmu" },
+ {},
+};
+
/*
* exynos_map_io
*
@@ -327,6 +338,32 @@ static int __init exynos4_l2x0_cache_init(void)
}
early_initcall(exynos4_l2x0_cache_init);

+
+struct regmap *get_exynos_pmuregmap()
+{
+ return exynos_pmu_regmap;
+}
+
+void __init exynos_map_pmu(void)
+{
+ struct device_node *np = NULL;
+
+ early_syscon_init();
+
+ np = of_find_matching_node(NULL, exynos_dt_pmu_match);
+
+ if (!np) {
+ pr_err("Failed to find PMU node\n");
+ return;
+ } else {
+ exynos_pmu_regmap = syscon_early_regmap_lookup_by_phandle(np,
+ "samsung,syscon-phandle");
+ }
+
+ if (IS_ERR(exynos_pmu_regmap))
+ pr_err("failed to find exynos_pmu_regmap\n");
+}
+
static void __init exynos_dt_machine_init(void)
{
struct device_node *i2c_np;
@@ -355,6 +392,8 @@ static void __init exynos_dt_machine_init(void)
}
}

+ exynos_map_pmu();
+
if (!soc_is_exynos5440())
platform_device_register(&exynos_cpuidle);

--
1.7.10.4


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