This patch adds driver for a trivial gpio core, which is described in http://nioswiki.com/GPIO. It is used for gpio led and nand flash interface in u-boot.
When CONFIG_SYS_GPIO_BASE is not defined, board may provide its own driver.
Signed-off-by: Thomas Chou thomas@wytron.com.tw --- v4: remove () from gpio when it is not in a macro. v3: arch dir reorganized.
arch/nios2/include/asm/gpio.h | 52 +++++++++++++++++++++++++++++++++++++++++ 1 files changed, 52 insertions(+), 0 deletions(-) create mode 100644 arch/nios2/include/asm/gpio.h
diff --git a/arch/nios2/include/asm/gpio.h b/arch/nios2/include/asm/gpio.h new file mode 100644 index 0000000..76c425e --- /dev/null +++ b/arch/nios2/include/asm/gpio.h @@ -0,0 +1,52 @@ +/* + * nios2 gpio driver + * + * This gpio core is described in http://nioswiki.com/GPIO + * bit[0] data + * bit[1] output enable + * + * when CONFIG_SYS_GPIO_BASE is not defined, board may provide + * its own driver. + * + * Copyright (C) 2010 Thomas Chou thomas@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_ + +#ifdef CONFIG_SYS_GPIO_BASE +#include <asm/io.h> + +static inline int gpio_direction_input(unsigned gpio) +{ + writel(1, CONFIG_SYS_GPIO_BASE + (gpio << 2)); + return 0; +} + +static inline int gpio_direction_output(unsigned gpio, int value) +{ + writel(value ? 3 : 2, CONFIG_SYS_GPIO_BASE + (gpio << 2)); + return 0; +} + +static inline int gpio_get_value(unsigned gpio) +{ + return readl(CONFIG_SYS_GPIO_BASE + (gpio << 2)); +} + +static inline void gpio_set_value(unsigned gpio, int value) +{ + writel(value ? 3 : 2, CONFIG_SYS_GPIO_BASE + (gpio << 2)); +} +#else +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); +#endif /* CONFIG_SYS_GPIO_BASE */ + +#endif /* _ASM_NIOS2_GPIO_H_ */