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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/microblaze/kernel/reset.c
Initial import
Diffstat (limited to 'arch/microblaze/kernel/reset.c')
-rw-r--r--arch/microblaze/kernel/reset.c107
1 files changed, 107 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/reset.c b/arch/microblaze/kernel/reset.c
new file mode 100644
index 000000000..bab4c8330
--- /dev/null
+++ b/arch/microblaze/kernel/reset.c
@@ -0,0 +1,107 @@
+/*
+ * 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;
+
+void 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;
+ }
+
+ ret = gpio_request(handle, "reset");
+ if (ret < 0) {
+ pr_info("GPIO pin is already allocated\n");
+ return;
+ }
+
+ /* 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;
+err:
+ gpio_free(handle);
+ return;
+}
+
+
+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)
+ ;
+}