[U-Boot] [PATCH 3/6 v3] nios2: add gpio support to nios2-generic board

[Scott McNutt <smcnutt@psyent.com>]

Applied to:

   git://git.denx.de/u-boot-nios.git next

Thanks,
--Scott


Thomas Chou wrote:
> 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 */
>