This patch adds driver for a trivial gpio core, which is described in http://nioswiki.com/GPIO.
Signed-off-by: Thomas Chou <tho...@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 <tho...@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 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
