[U-Boot] [PATCH] nios2: add gpio support with asm-nios2/gpio.h

[Thomas Chou]

This patch adds driver for a trivial gpio core, which is described
in http://nioswiki.com/GPIO.

Signed-off-by: Thomas Chou <thomas at wytron.com.tw>
---
 include/asm-nios2/gpio.h |   42 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 42 insertions(+), 0 deletions(-)
 create mode 100644 include/asm-nios2/gpio.h

diff --git a/include/asm-nios2/gpio.h b/include/asm-nios2/gpio.h
new file mode 100644
index 0000000..ef8c9fd
--- /dev/null
+++ b/include/asm-nios2/gpio.h
@@ -0,0 +1,42 @@
+/*
+ * nios2 gpio driver
+ *
+ * This gpio core is described in http://nioswiki.com/GPIO
+ * bit[0] data
+ * bit[1] output enable
+ *
+ * Copyright (C) 2010 Thomas Chou <thomas at wytron.com.tw>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _ASM_NIOS2_GPIO_H_
+#define _ASM_NIOS2_GPIO_H_ 1
+
+#include <asm/io.h>
+
+static inline int gpio_direction_input(unsigned pin)
+{
+	writel(1, CONFIG_SYS_GPIO_BASE + ((pin) << 2));
+	return 0;
+}
+
+static inline int gpio_direction_output(unsigned pin, int value)
+{
+	writel(value ? 3 : 2, CONFIG_SYS_GPIO_BASE + ((pin) << 2));
+	return 0;
+}
+
+static inline int gpio_get_value(unsigned pin)
+{
+	return readl(CONFIG_SYS_GPIO_BASE + ((pin) << 2));
+}
+
+static inline void gpio_set_value(unsigned pin, int value)
+{
+	writel(value ? 3 : 2, CONFIG_SYS_GPIO_BASE + ((pin) << 2));
+}
+
+#endif /* _ASM_NIOS2_GPIO_H_ */
-- 
1.6.6.1