diff options
| author | Minkyu Kang <mk7.kang@samsung.com> | 2010-07-06 17:29:44 +0900 |
|---|---|---|
| committer | Minkyu Kang <mk7.kang@samsung.com> | 2010-07-06 17:29:44 +0900 |
| commit | 2271d3ddccfbd4a7640121669ff9b013b1fea361 (patch) | |
| tree | 400f22f0a12ff0ae6c472bed6ac648befc1744a2 /board/altera/nios2-generic/gpio.c | |
| parent | 25ae8aeb54a6ca89ba1fd11c00865b8fed9348b4 (diff) | |
| parent | 54841ab50c20d6fa6c9cc3eb826989da3a22d934 (diff) | |
Merge branch 'master' of git://git.denx.de/u-boot
Diffstat (limited to 'board/altera/nios2-generic/gpio.c')
| -rw-r--r-- | board/altera/nios2-generic/gpio.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/board/altera/nios2-generic/gpio.c b/board/altera/nios2-generic/gpio.c new file mode 100644 index 0000000000..6c9c6c28e0 --- /dev/null +++ b/board/altera/nios2-generic/gpio.c @@ -0,0 +1,55 @@ +/* + * board gpio driver + * + * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw> + * Licensed under the GPL-2 or later. + */ +#include <common.h> +#include <asm/io.h> + +#ifndef CONFIG_SYS_GPIO_BASE + +#define ALTERA_PIO_BASE LED_PIO_BASE +#define ALTERA_PIO_DATA (ALTERA_PIO_BASE + 0) +#define ALTERA_PIO_DIR (ALTERA_PIO_BASE + 4) +static u32 pio_data_reg; +static u32 pio_dir_reg; + +int gpio_direction_input(unsigned gpio) +{ + u32 mask = 1 << gpio; + writel(pio_dir_reg &= ~mask, ALTERA_PIO_DIR); + return 0; +} + +int gpio_direction_output(unsigned gpio, int value) +{ + u32 mask = 1 << gpio; + if (value) + pio_data_reg |= mask; + else + pio_data_reg &= ~mask; + writel(pio_data_reg, ALTERA_PIO_DATA); + writel(pio_dir_reg |= mask, ALTERA_PIO_DIR); + return 0; +} + +int gpio_get_value(unsigned gpio) +{ + u32 mask = 1 << gpio; + if (pio_dir_reg & mask) + return (pio_data_reg & mask) ? 1 : 0; + else + return (readl(ALTERA_PIO_DATA) & mask) ? 1 : 0; +} + +void gpio_set_value(unsigned gpio, int value) +{ + u32 mask = 1 << gpio; + if (value) + pio_data_reg |= mask; + else + pio_data_reg &= ~mask; + writel(pio_data_reg, ALTERA_PIO_DATA); +} +#endif |