diff options
| author | Thomas Chou <thomas@wytron.com.tw> | 2010-04-30 11:34:15 +0800 |
|---|---|---|
| committer | Scott McNutt <smcnutt@psyent.com> | 2010-05-28 10:56:03 -0400 |
| commit | 1e8e9bad2db38e93c3bc9f4b6238b3d8be99e469 (patch) | |
| tree | 2dfdb65f3c2fd1bfdfa7f5b5d585396d9c98123b /board/altera | |
| parent | 3e6b86b5552840bb4147871a753840eb3923374c (diff) | |
| download | u-boot-imx-1e8e9bad2db38e93c3bc9f4b6238b3d8be99e469.zip u-boot-imx-1e8e9bad2db38e93c3bc9f4b6238b3d8be99e469.tar.gz u-boot-imx-1e8e9bad2db38e93c3bc9f4b6238b3d8be99e469.tar.bz2 | |
nios2: add gpio support to nios2-generic board
This patch adds gpio support of Altera PIO component to the
nios2-generic board. Though it drives only gpio_led at the
moment, it supports bidirectional port to control bit-banging
I2C, NAND flash busy status or button switches, etc.
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 'board/altera')
| -rw-r--r-- | board/altera/nios2-generic/Makefile | 1 | ||||
| -rw-r--r-- | board/altera/nios2-generic/gpio.c | 55 |
2 files changed, 56 insertions, 0 deletions
diff --git a/board/altera/nios2-generic/Makefile b/board/altera/nios2-generic/Makefile index 6780872..d1fca70 100644 --- a/board/altera/nios2-generic/Makefile +++ b/board/altera/nios2-generic/Makefile @@ -32,6 +32,7 @@ LIB = $(obj)lib$(BOARD).a COBJS-y := $(BOARD).o COBJS-$(CONFIG_CMD_IDE) += ../common/cfide.o COBJS-$(CONFIG_EPLED) += ../common/epled.o +COBJS-$(CONFIG_GPIO) += gpio.o COBJS-$(CONFIG_SEVENSEG) += ../common/sevenseg.o SOBJS-y := text_base.o diff --git a/board/altera/nios2-generic/gpio.c b/board/altera/nios2-generic/gpio.c new file mode 100644 index 0000000..6c9c6c2 --- /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 |