linux-kernel - [PATCH 06/10] ARM: EXYNOS: Add support for mapping PMU base address via DT

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Message-id: <1396425058-4012-7-git-send-email-pankaj.dubey@samsung.com>
Date:	Wed, 02 Apr 2014 16:50:57 +0900
From:	Pankaj Dubey <pankaj.dubey@...sung.com>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org
Cc:	kgene.kim@...sung.com, linux@....linux.org.uk,
	chow.kim@...sung.com, Young-Gun Jang <yg1004.jang@...sung.com>,
	Pankaj Dubey <pankaj.dubey@...sung.com>
Subject: [PATCH 06/10] ARM: EXYNOS: Add support for mapping PMU base address
 via DT

From: Young-Gun Jang <yg1004.jang@...sung.com>

Add support for mapping Exynos Power Management Unit (PMU) base address
from device tree. Code will use existing samsung pmu binding information.
This patch also adds "get_exynos_pmubase" a helper function to return mapped base
address to various other files under "mach-exynos".

Signed-off-by: Young-Gun Jang <yg1004.jang@...sung.com>
Signed-off-by: Pankaj Dubey <pankaj.dubey@...sung.com>
---
 arch/arm/mach-exynos/common.h |    2 ++
 arch/arm/mach-exynos/exynos.c |   44 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
index ff28334..9a55cf6 100644
--- a/arch/arm/mach-exynos/common.h
+++ b/arch/arm/mach-exynos/common.h
@@ -61,4 +61,6 @@ struct exynos_pmu_conf {
 
 extern void exynos_sys_powerdown_conf(enum sys_powerdown mode);
 
+extern void __iomem *get_exynos_pmubase(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 a5e1349..a5127fb 100644
--- a/arch/arm/mach-exynos/exynos.c
+++ b/arch/arm/mach-exynos/exynos.c
@@ -35,6 +35,8 @@
 #define L2_AUX_VAL 0x7C470001
 #define L2_AUX_MASK 0xC200ffff
 
+static void __iomem *exynos_pmu_base __initdata;
+
 static struct map_desc exynos4_iodesc[] __initdata = {
 	{
 		.virtual	= (unsigned long)S3C_VA_SYS,
@@ -245,6 +247,47 @@ void __init exynos_init_late(void)
 	exynos_pm_init();
 }
 
+static char const *exynos_dt_pmu_match[] __initconst = {
+	"samsung,exynos4210-pmu",
+	"samsung,exynos4212-pmu",
+	"samsung,exynos4412-pmu",
+	"samsung,exynos5250-pmu",
+	NULL
+};
+
+static int __init exynos_fdt_map_pmu(unsigned long node,
+		const char *uname, int depth, void *data)
+{
+	struct map_desc iodesc;
+	__be32 *reg;
+	unsigned long len;
+
+	if (of_flat_dt_match(node, exynos_dt_pmu_match)) {
+		phys_addr_t phys_addr;
+		reg = of_get_flat_dt_prop(node, "reg", &len);
+		if (reg == NULL || len != (sizeof(unsigned long) * 2))
+			return 0;
+
+		phys_addr = be32_to_cpu(reg[0]);
+		iodesc.pfn = __phys_to_pfn(phys_addr);
+		iodesc.length = be32_to_cpu(reg[1]) - 1;
+		iodesc.virtual = (unsigned long)S5P_VA_PMU;
+		iodesc.type = MT_DEVICE;
+		iotable_init(&iodesc, 1);
+
+		exynos_pmu_base = ioremap(phys_addr, be32_to_cpu(reg[1]));
+		if (WARN_ON(!exynos_pmu_base))
+			return -EFAULT;
+	}
+
+	return 0;
+}
+
+inline void __iomem *get_exynos_pmubase()
+{
+	return exynos_pmu_base;
+}
+
 static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
 					int depth, void *data)
 {
@@ -301,6 +344,7 @@ void __init exynos_init_io(void)
 	debug_ll_io_init();
 
 	of_scan_flat_dt(exynos_fdt_map_chipid, NULL);
+	of_scan_flat_dt(exynos_fdt_map_pmu, NULL);
 
 	/* detect cpu id and rev. */
 	s5p_init_cpu(S5P_VA_CHIPID);
-- 
1.7.10.4

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