ARM: i.MX: provide access to reset cause through get_imx_reset_cause()

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>

arch/arm/imx-common/cpu.c

@@ -24,13 +24,16 @@
 #include <fsl_esdhc.h>
 #endif
 
-char *get_reset_cause(void)
+static u32 reset_cause = -1;
+
+static 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);
+	reset_cause = cause;
 
 	switch (cause) {
 	case 0x00001:
@@ -53,6 +56,11 @@ char *get_reset_cause(void)
 	}
 }
 
+u32 get_imx_reset_cause(void)
+{
+	return reset_cause;
+}
+
 #if defined(CONFIG_MX53) || defined(CONFIG_MX6)
 #if defined(CONFIG_MX53)
 #define MEMCTL_BASE	ESDCTL_BASE_ADDR

arch/arm/include/asm/arch-imx/cpu.h

@@ -17,3 +17,5 @@
 #define CS0_64M_CS1_64M				1
 #define CS0_64M_CS1_32M_CS2_32M			2
 #define CS0_32M_CS1_32M_CS2_32M_CS3_32M		3
+
+u32 get_imx_reset_cause(void);