Signed-off-by: Juergen Beisert <jbe@xxxxxxxxxxxxxx>
---
arch/arm/mach-imx/Makefile | 1 +
arch/arm/mach-imx/reset_source.c | 72 ++++++++++++++++++++++++++++++++++++++
2 files changed, 73 insertions(+)
create mode 100644 arch/arm/mach-imx/reset_source.c
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index 89a8946..2ff537a 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -1,4 +1,5 @@
obj-y += clocksource.o gpio.o
+obj-$(CONFIG_RESET_SOURCE) += reset_source.o
obj-$(CONFIG_ARCH_IMX1) += speed-imx1.o imx1.o iomux-v1.o
obj-$(CONFIG_ARCH_IMX25) += speed-imx25.o imx25.o iomux-v3.o
obj-$(CONFIG_ARCH_IMX21) += speed-imx21.o imx21.o iomux-v1.o
diff --git a/arch/arm/mach-imx/reset_source.c b/arch/arm/mach-imx/reset_source.c
new file mode 100644
index 0000000..e7b2a90
--- /dev/null
+++ b/arch/arm/mach-imx/reset_source.c
@@ -0,0 +1,72 @@
+/*
+ * (C) Copyright 2012 Juergen Beisert - <kernel@xxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <common.h>
+#include <init.h>
+#include <io.h>
+#include <reset_source.h>
+#include <mach/imx-regs.h>
+
+#ifdef CONFIG_ARCH_IMX1
+# define IMX_RESET_SRC_WDOG (1 << 1)
+# define IMX_RESET_SRC_HRDRESET (1 << 0)
+/* let the compiler sort out useless code on this arch */
+# define IMX_RESET_SRC_WARMSTART 0
+# define IMX_RESET_SRC_COLDSTART 0
+#else
+ /* WRSR checked for i.MX25, i.MX27, i.MX31, i.MX35 and i.MX51 */
+# define WDOG_WRSR 0x04
+ /* valid for i.MX25, i.MX27, i.MX31, i.MX35, i.MX51 */
+# define IMX_RESET_SRC_WARMSTART (1 << 0)
+ /* valid for i.MX25, i.MX27, i.MX31, i.MX35, i.MX51 */
+# define IMX_RESET_SRC_WDOG (1 << 1)
+ /* valid for i.MX27, i.MX31, always '0' on i.MX25, i.MX35, i.MX51 */
+# define IMX_RESET_SRC_HRDRESET (1 << 3)
+ /* valid for i.MX27, i.MX31, always '0' on i.MX25, i.MX35, i.MX51 */
+# define IMX_RESET_SRC_COLDSTART (1 << 4)
+#endif
+
+static unsigned read_detection_register(void)
+{
+#ifdef CONFIG_ARCH_IMX1
+ return readl(IMX_SYSCTRL_BASE);
+#else
+ return readw(IMX_WDT_BASE + WDOG_WRSR);
+#endif
+}
+
+static int imx_detect_reset_source(void)
+{
+ unsigned reg = read_detection_register();
+
+ if (reg & IMX_RESET_SRC_COLDSTART) {
+ set_reset_source(RESET_POR);
+ return 0;
+ }
+
+ if (reg & (IMX_RESET_SRC_HRDRESET | IMX_RESET_SRC_WARMSTART)) {
+ set_reset_source(RESET_RST);
+ return 0;
+ }
+
+ if (reg & IMX_RESET_SRC_WDOG) {
+ set_reset_source(RESET_WDG);
+ return 0;
+ }
+
+ /* else keep the default 'unknown' state */
+ return 0;
+}
+
+device_initcall(imx_detect_reset_source);
--
1.7.10.4
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