diff options
| author | Thomas Chou <thomas@wytron.com.tw> | 2010-04-30 11:34:13 +0800 |
|---|---|---|
| committer | Scott McNutt <smcnutt@psyent.com> | 2010-05-28 10:56:03 -0400 |
| commit | cedd341d551b6b705e97ab1953a87575b9ff9ef9 (patch) | |
| tree | 3ab675b58aed1dd5a80f09c16a7a03198fdbe560 /arch/nios2/include | |
| parent | 01f03bda5b22e5aeae5f02fd537da97a41485c73 (diff) | |
| download | u-boot-imx-cedd341d551b6b705e97ab1953a87575b9ff9ef9.zip u-boot-imx-cedd341d551b6b705e97ab1953a87575b9ff9ef9.tar.gz u-boot-imx-cedd341d551b6b705e97ab1953a87575b9ff9ef9.tar.bz2 | |
nios2: add gpio support
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>
Tested-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Scott McNutt <smcnutt@psyent.com>
Diffstat (limited to 'arch/nios2/include')
| -rw-r--r-- | arch/nios2/include/asm/gpio.h | 52 |
1 files changed, 52 insertions, 0 deletions
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_ */ |