[U-Boot] [PATCH V4 1/2] MX5: factor out boot cause funciton to common code

[Jason Liu]

From: Liu Hui-R64343 <r64343 at freescale.com>

factor out boot cause funciton to common code to avoid
the duplicate code in each board support package

Signed-off-by: Jason Liu <r64343 at freescale.com>
---
changes since v3:
- add full boot reset cause
---
 arch/arm/cpu/armv7/mx5/soc.c              |   27 +++++++++++++++++++++++++++
 arch/arm/include/asm/arch-mx5/sys_proto.h |    1 +
 2 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/arch/arm/cpu/armv7/mx5/soc.c b/arch/arm/cpu/armv7/mx5/soc.c
index 09500b3..975864d 100644
--- a/arch/arm/cpu/armv7/mx5/soc.c
+++ b/arch/arm/cpu/armv7/mx5/soc.c
@@ -77,6 +77,33 @@ u32 get_cpu_rev(void)
 	return system_rev;
 }
 
+char *get_reset_cause(void)
+{
+	u32 cause;
+	struct src *src_regs = (struct src *)SRC_BASE_ADDR;
+
+	cause = readl(&src_regs->srsr);
+	writel(cause, &src_regs->srsr);
+
+	switch (cause) {
+	case 0x00001:
+		return "POR";
+	case 0x00004:
+		return "CSU";
+	case 0x00008:
+		return "IPP USER";
+	case 0x00010:
+		return "WDOG";
+	case 0x00020:
+		return "JTAG HIGH-Z";
+	case 0x00040:
+		return "JTAG SW";
+	case 0x10000:
+		return "WARM BOOT";
+	default:
+		return "unknown reset";
+	}
+}
 
 #if defined(CONFIG_DISPLAY_CPUINFO)
 int print_cpuinfo(void)
diff --git a/arch/arm/include/asm/arch-mx5/sys_proto.h b/arch/arm/include/asm/arch-mx5/sys_proto.h
index f687503..00c2c5d 100644
--- a/arch/arm/include/asm/arch-mx5/sys_proto.h
+++ b/arch/arm/include/asm/arch-mx5/sys_proto.h
@@ -27,5 +27,6 @@
 u32 get_cpu_rev(void);
 #define is_soc_rev(rev)	((get_cpu_rev() & 0xFF) - rev)
 void sdelay(unsigned long);
+char *get_reset_cause(void);
 
 #endif
-- 
1.7.1