1 files changed, 84 insertions, 0 deletions
diff --git a/arch/openrisc/include/asm/gpio.h b/arch/openrisc/include/asm/gpio.h
new file mode 100644
index 0000000000..8c0cc8049e
--- /dev/null
+++ b/arch/openrisc/include/asm/gpio.h
@@ -0,0 +1,84 @@
+/*
+ * OpenRISC gpio driver
+ *
+ * Copyright (C) 2011 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
+ *
+ * based on nios2 gpio driver
+ * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
+ *
+ * when CONFIG_SYS_GPIO_BASE is not defined, board may provide
+ * its own driver.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifdef CONFIG_SYS_GPIO_BASE
+#include <asm/io.h>
+
+static inline int gpio_request(unsigned gpio, const char *label)
+{
+	return 0;
+}
+
+static inline int gpio_free(unsigned gpio)
+{
+	return 0;
+}
+
+static inline int gpio_get_value(unsigned gpio)
+{
+	return (readb(CONFIG_SYS_GPIO_BASE + gpio/8) >> gpio%8) & 0x1;
+}
+
+static inline void gpio_set_value(unsigned gpio, int value)
+{
+	u8 tmp = readb(CONFIG_SYS_GPIO_BASE + gpio/8);
+
+	if (value)
+		tmp |= (1 << gpio%8);
+	else
+		tmp &= ~(1 << gpio%8);
+	writeb(tmp, CONFIG_SYS_GPIO_BASE + gpio/8);
+}
+
+static inline int gpio_direction_input(unsigned gpio)
+{
+	gpio_set_value(gpio + CONFIG_SYS_GPIO_WIDTH, 0);
+
+	return 0;
+}
+
+static inline int gpio_direction_output(unsigned gpio, int value)
+{
+	gpio_set_value(gpio + CONFIG_SYS_GPIO_WIDTH, 1);
+	gpio_set_value(gpio, value);
+
+	return 0;
+}
+
+static inline int gpio_is_valid(int number)
+{
+	return ((unsigned)number) < CONFIG_SYS_GPIO_WIDTH;
+}
+#else
+extern int gpio_request(unsigned gpio, const char *label);
+extern int gpio_free(unsigned gpio);
+extern int gpio_direction_input(unsigned gpio);
+extern int gpio_direction_output(unsigned gpio, int value);
+extern int gpio_get_value(unsigned gpio);
+extern void gpio_set_value(unsigned gpio, int value);
+extern int gpio_is_valid(int number);
+#endif /* CONFIG_SYS_GPIO_BASE */