[U-Boot] [PATCH 15/28] nios2: add gpio support with asm-nios2/gpio.h

[Thomas Chou]

This gpio core is described in http://nioswiki.com/GPIO.

Signed-off-by: Thomas Chou <thomas at wytron.com.tw>
---
 include/asm-nios2/gpio.h |   72 ++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 72 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..3a98a0d
--- /dev/null
+++ b/include/asm-nios2/gpio.h
@@ -0,0 +1,72 @@
+/*
+ * Altera GPIO driver
+ *
+ * The gpio core and usage is described in http://nioswiki.com/GPIO
+ *
+ * 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>
+
+#define AVALON_GPIO_PORT(p) (CONFIG_SYS_GPIO_BASE + ((p) << 2))
+
+static inline int gpio_is_valid(int number)
+{
+	return 1;
+}
+
+static inline int gpio_request(unsigned gpio, const char *label)
+{
+	return 0;
+}
+
+static inline void gpio_free(unsigned gpio)
+{
+}
+
+static inline int gpio_direction_input(unsigned gpio)
+{
+	writel(1, AVALON_GPIO_PORT(gpio));
+	return 0;
+}
+
+static inline int gpio_direction_output(unsigned gpio, int value)
+{
+	writel(value ? 3 : 2, AVALON_GPIO_PORT(gpio));
+	return 0;
+}
+
+static inline int gpio_get_value(unsigned gpio)
+{
+	return readl(AVALON_GPIO_PORT(gpio));
+}
+
+static inline void gpio_set_value(unsigned gpio, int value)
+{
+	writel(value ? 3 : 2, AVALON_GPIO_PORT(gpio));
+}
+
+static inline int gpio_cansleep(unsigned gpio)
+{
+	return 0;
+}
+
+static inline int gpio_get_value_cansleep(unsigned gpio)
+{
+	return gpio_get_value(gpio);
+}
+
+static inline void gpio_set_value_cansleep(unsigned gpio, int value)
+{
+	gpio_set_value(gpio, value);
+}
+
+#undef AVALON_GPIO_PORT
+#endif /* _ASM_NIOS2_GPIO_H_ */
-- 
1.6.6.1