Add support for mapping Samsung Power Management Unit (PMU)
base address from device tree.
Signed-off-by: Pankaj Dubey <pankaj.dubey@xxxxxxxxxxx>
---
arch/arm/mach-exynos/common.h | 1 +
arch/arm/mach-exynos/exynos.c | 45 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 46 insertions(+)
diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
index 3f25f89..f3114be 100644
--- a/arch/arm/mach-exynos/common.h
+++ b/arch/arm/mach-exynos/common.h
@@ -113,6 +113,7 @@ IS_SAMSUNG_CPU(exynos5800, EXYNOS5800_SOC_ID, EXYNOS5_SOC_MASK)
extern void __iomem *sysram_ns_base_addr;
extern void __iomem *sysram_base_addr;
+extern void __iomem *pmu_base_addr;
void exynos_firmware_init(void);
diff --git a/arch/arm/mach-exynos/exynos.c b/arch/arm/mach-exynos/exynos.c
index 4a69b3f..82dabc8 100644
--- a/arch/arm/mach-exynos/exynos.c
+++ b/arch/arm/mach-exynos/exynos.c
@@ -19,6 +19,8 @@
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
+#include <linux/clocksource.h>
+#include <linux/clk-provider.h>
#include <asm/cacheflush.h>
#include <asm/hardware/cache-l2x0.h>
@@ -31,6 +33,8 @@
#include "regs-pmu.h"
#include "regs-sys.h"
+void __iomem *pmu_base_addr;
+
static struct map_desc exynos4_iodesc[] __initdata = {
{
.virtual = (unsigned long)S3C_VA_SYS,
@@ -231,6 +235,46 @@ static void __init exynos_init_io(void)
exynos_map_io();
}
+static const struct of_device_id exynos_dt_pmu_match[] = {
+ { .compatible = "samsung,exynos3250-pmu" },
+ { .compatible = "samsung,exynos4210-pmu" },
+ { .compatible = "samsung,exynos4212-pmu" },
+ { .compatible = "samsung,exynos4412-pmu" },
+ { .compatible = "samsung,exynos5250-pmu" },
+ { .compatible = "samsung,exynos5420-pmu" },
+ {},
+};
+
+static void exynos_map_pmu(void)
+{
+ struct device_node *np = NULL;
+
+ np = of_find_matching_node(NULL, exynos_dt_pmu_match);
+
+ if (!np) {
+ pr_err("Failed to find PMU node\n");
+ return;
+ }
+
+ pmu_base_addr = of_iomap(np, 0);
+
+ if (!pmu_base_addr)
+ panic("failed to find exynos pmu register\n");
+}
+
+static void __init exynos_init_time(void)
+{
+ /* Nothing to do timer specific.
+ * Since platsmp.c needs pmu base address by the time
+ * DT is not unflatten so we can't use DT APIs before
+ * init_time
+ */
+ exynos_map_pmu();
+
+ of_clk_init(NULL);
+ clocksource_of_init();
+}
+
static void __init exynos_dt_machine_init(void)
{
struct device_node *i2c_np;
@@ -306,6 +350,7 @@ DT_MACHINE_START(EXYNOS_DT, "SAMSUNG EXYNOS (Flattened Device Tree)")
.smp = smp_ops(exynos_smp_ops),
.map_io = exynos_init_io,
.init_early = exynos_firmware_init,
+ .init_time = exynos_init_time,
.init_machine = exynos_dt_machine_init,
.init_late = exynos_init_late,
.dt_compat = exynos_dt_compat,
--
1.7.9.5
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