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 --- v3: split patches for gpio and spi, based gpio on altera pio core. v2: remove mmc_spi_init()
board/altera/nios2-generic/Makefile | 1 + board/altera/nios2-generic/gpio.c | 55 +++++++++++++++++++++++++++++++++++ include/configs/nios2-generic.h | 6 ++-- 3 files changed, 59 insertions(+), 3 deletions(-) create mode 100644 board/altera/nios2-generic/gpio.c
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 diff --git a/include/configs/nios2-generic.h b/include/configs/nios2-generic.h index e83e1e3..e4bf57b 100644 --- a/include/configs/nios2-generic.h +++ b/include/configs/nios2-generic.h @@ -63,10 +63,10 @@ * STATUS LED */ #define CONFIG_STATUS_LED /* Enable status driver */ -#define CONFIG_EPLED /* Enable LED PIO driver */ -#define CONFIG_SYS_LEDPIO_ADDR LED_PIO_BASE +#define CONFIG_GPIO_LED /* Enable GPIO LED driver */ +#define CONFIG_GPIO /* Enable GPIO driver */
-#define STATUS_LED_BIT 1 /* Bit-0 on PIO */ +#define STATUS_LED_BIT 0 /* Bit-0 on GPIO */ #define STATUS_LED_STATE 1 /* Blinking */ #define STATUS_LED_PERIOD (500 / CONFIG_SYS_NIOS_TMRMS) /* 500 msec */