1 files changed, 108 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/reset.c b/arch/microblaze/kernel/reset.c
new file mode 100644
index 000000000..fcbe1daf6
--- /dev/null
+++ b/arch/microblaze/kernel/reset.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2009 PetaLogix
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/init.h>
+#include <linux/of_platform.h>
+
+/* Trigger specific functions */
+#ifdef CONFIG_GPIOLIB
+
+#include <linux/of_gpio.h>
+
+static int handle; /* reset pin handle */
+static unsigned int reset_val;
+
+static int of_platform_reset_gpio_probe(void)
+{
+	int ret;
+	handle = of_get_named_gpio(of_find_node_by_path("/"),
+				   "hard-reset-gpios", 0);
+
+	if (!gpio_is_valid(handle)) {
+		pr_info("Skipping unavailable RESET gpio %d (%s)\n",
+				handle, "reset");
+		return -ENODEV;
+	}
+
+	ret = gpio_request(handle, "reset");
+	if (ret < 0) {
+		pr_info("GPIO pin is already allocated\n");
+		return ret;
+	}
+
+	/* get current setup value */
+	reset_val = gpio_get_value(handle);
+	/* FIXME maybe worth to perform any action */
+	pr_debug("Reset: Gpio output state: 0x%x\n", reset_val);
+
+	/* Setup GPIO as output */
+	ret = gpio_direction_output(handle, 0);
+	if (ret < 0)
+		goto err;
+
+	/* Setup output direction */
+	gpio_set_value(handle, 0);
+
+	pr_info("RESET: Registered gpio device: %d, current val: %d\n",
+							handle, reset_val);
+	return 0;
+err:
+	gpio_free(handle);
+	return ret;
+}
+device_initcall(of_platform_reset_gpio_probe);
+
+
+static void gpio_system_reset(void)
+{
+	if (gpio_is_valid(handle))
+		gpio_set_value(handle, 1 - reset_val);
+	else
+		pr_notice("Reset GPIO unavailable - halting!\n");
+}
+#else
+static void gpio_system_reset(void)
+{
+	pr_notice("No reset GPIO present - halting!\n");
+}
+
+void of_platform_reset_gpio_probe(void)
+{
+	return;
+}
+#endif
+
+void machine_restart(char *cmd)
+{
+	pr_notice("Machine restart...\n");
+	gpio_system_reset();
+	while (1)
+		;
+}
+
+void machine_shutdown(void)
+{
+	pr_notice("Machine shutdown...\n");
+	while (1)
+		;
+}
+
+void machine_halt(void)
+{
+	pr_notice("Machine halt...\n");
+	while (1)
+		;
+}
+
+void machine_power_off(void)
+{
+	pr_notice("Machine power off...\n");
+	while (1)
+		;
+}