linux-kernel - [PATCH 2/4] powerpc: get the physical base address of DCSR

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Date:	Fri, 31 Jul 2015 20:53:04 +0800
From:	Chenhui Zhao <chenhui.zhao@...escale.com>
To:	<linuxppc-dev@...ts.ozlabs.org>, <scottwood@...escale.com>
CC:	<linux-kernel@...r.kernel.org>, <Jason.Jin@...escale.com>
Subject: [PATCH 2/4] powerpc: get the physical base address of DCSR

Add get_dcsrbase() to get the physical base address of DCSR.

Signed-off-by: Chenhui Zhao <chenhui.zhao@...escale.com>
---
 arch/powerpc/sysdev/fsl_soc.c | 31 +++++++++++++++++++++++++++++++
 arch/powerpc/sysdev/fsl_soc.h |  1 +
 2 files changed, 32 insertions(+)

diff --git a/arch/powerpc/sysdev/fsl_soc.c b/arch/powerpc/sysdev/fsl_soc.c
index 99269c0..ffb7c1c 100644
--- a/arch/powerpc/sysdev/fsl_soc.c
+++ b/arch/powerpc/sysdev/fsl_soc.c
@@ -45,6 +45,37 @@ extern void init_fcc_ioports(struct fs_platform_info*);
 extern void init_fec_ioports(struct fs_platform_info*);
 extern void init_smc_ioports(struct fs_uart_platform_info*);
 static phys_addr_t immrbase = -1;
+static phys_addr_t dcsrbase = -1;
+
+phys_addr_t get_dcsrbase(void)
+{
+	struct device_node *np;
+	const __be32 *prop;
+	int size;
+	u32 naddr;
+
+	if (dcsrbase != -1)
+		return dcsrbase;
+
+	np = of_find_compatible_node(NULL, NULL, "fsl,dcsr");
+	if (!np)
+		return -1;
+
+	prop = of_get_property(np, "#address-cells", &size);
+	if (prop && size == 4)
+		naddr = be32_to_cpup(prop);
+	else
+		naddr = 2;
+
+	prop = of_get_property(np, "ranges", NULL);
+	if (prop)
+		dcsrbase = of_translate_address(np, prop + naddr);
+
+	of_node_put(np);
+
+	return dcsrbase;
+}
+EXPORT_SYMBOL(get_dcsrbase);
 
 phys_addr_t get_immrbase(void)
 {
diff --git a/arch/powerpc/sysdev/fsl_soc.h b/arch/powerpc/sysdev/fsl_soc.h
index 4c5a19e..5fdd3a5 100644
--- a/arch/powerpc/sysdev/fsl_soc.h
+++ b/arch/powerpc/sysdev/fsl_soc.h
@@ -6,6 +6,7 @@
 
 struct spi_device;
 
+extern phys_addr_t get_dcsrbase(void);
 extern phys_addr_t get_immrbase(void);
 #if defined(CONFIG_CPM2) || defined(CONFIG_QUICC_ENGINE) || defined(CONFIG_8xx)
 extern u32 get_brgfreq(void);
-- 
1.9.1

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