[U-Boot] [PATCH 4/6] sunxi: add gpio driver

[Hans de Goede]

Hi,

On 06/05/2014 08:00 PM, Ian Campbell wrote:
> This patch enables CONFIG_CMD_GPIO for the Allwinner (sunxi) platform as well
> as providing the common gpio API (gpio_request/free, direction in/out, get/set
> etc).
> 
> Signed-off-by: Chen-Yu Tsai <wens at csie.org>
> Signed-off-by: Hans de Goede <hdegoede at redhat.com>
> Signed-off-by: Ma Haijun <mahaijuns at gmail.com>
> Signed-off-by: Oliver Schinagl <oliver at schinagl.nl>
> Signed-off-by: Ian Campbell <ijc at hellion.org.uk>
> Cc: Henrik Nordström <henrik at henriknordstrom.net>
> Cc: Tom Cubie <Mr.hipboi at gmail.com>
> ---
>  arch/arm/include/asm/arch-sunxi/gpio.h |   2 +
>  drivers/gpio/Makefile                  |   1 +
>  drivers/gpio/sunxi_gpio.c              | 102 +++++++++++++++++++++++++++++++++
>  include/configs/sunxi-common.h         |   4 ++
>  4 files changed, 109 insertions(+)
>  create mode 100644 drivers/gpio/sunxi_gpio.c

Looks good:

Acked-by: Hans de Goede <hdegoede at redhat.com>

Regards,

Hans


> 
> diff --git a/arch/arm/include/asm/arch-sunxi/gpio.h b/arch/arm/include/asm/arch-sunxi/gpio.h
> index 892479c..f7f3d8c 100644
> --- a/arch/arm/include/asm/arch-sunxi/gpio.h
> +++ b/arch/arm/include/asm/arch-sunxi/gpio.h
> @@ -143,5 +143,7 @@ int sunxi_gpio_set_cfgpin(u32 pin, u32 val);
>  int sunxi_gpio_get_cfgpin(u32 pin);
>  int sunxi_gpio_set_drv(u32 pin, u32 val);
>  int sunxi_gpio_set_pull(u32 pin, u32 val);
> +int sunxi_name_to_gpio(const char *name);
> +#define name_to_gpio(name) sunxi_name_to_gpio(name)
>  
>  #endif /* _SUNXI_GPIO_H */
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 4e001e1..86813b9 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -34,3 +34,4 @@ obj-$(CONFIG_XILINX_GPIO)	+= xilinx_gpio.o
>  obj-$(CONFIG_ADI_GPIO2)	+= adi_gpio2.o
>  obj-$(CONFIG_TCA642X)		+= tca642x.o
>  oby-$(CONFIG_SX151X)		+= sx151x.o
> +obj-$(CONFIG_SUNXI_GPIO)	+= sunxi_gpio.o
> diff --git a/drivers/gpio/sunxi_gpio.c b/drivers/gpio/sunxi_gpio.c
> new file mode 100644
> index 0000000..0c50a8f
> --- /dev/null
> +++ b/drivers/gpio/sunxi_gpio.c
> @@ -0,0 +1,102 @@
> +/*
> + * (C) Copyright 2012 Henrik Nordstrom <henrik at henriknordstrom.net>
> + *
> + * Based on earlier arch/arm/cpu/armv7/sunxi/gpio.c:
> + *
> + * (C) Copyright 2007-2011
> + * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
> + * Tom Cubie <tangliang at allwinnertech.com>
> + *
> + * SPDX-License-Identifier:	GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <asm/io.h>
> +#include <asm/gpio.h>
> +
> +static int sunxi_gpio_output(u32 pin, u32 val)
> +{
> +	u32 dat;
> +	u32 bank = GPIO_BANK(pin);
> +	u32 num = GPIO_NUM(pin);
> +	struct sunxi_gpio *pio = BANK_TO_GPIO(bank);
> +
> +	dat = readl(&pio->dat);
> +	if (val)
> +		dat |= 0x1 << num;
> +	else
> +		dat &= ~(0x1 << num);
> +
> +	writel(dat, &pio->dat);
> +
> +	return 0;
> +}
> +
> +static int sunxi_gpio_input(u32 pin)
> +{
> +	u32 dat;
> +	u32 bank = GPIO_BANK(pin);
> +	u32 num = GPIO_NUM(pin);
> +	struct sunxi_gpio *pio = BANK_TO_GPIO(bank);
> +
> +	dat = readl(&pio->dat);
> +	dat >>= num;
> +
> +	return dat & 0x1;
> +}
> +
> +int gpio_request(unsigned gpio, const char *label)
> +{
> +	return 0;
> +}
> +
> +int gpio_free(unsigned gpio)
> +{
> +	return 0;
> +}
> +
> +int gpio_direction_input(unsigned gpio)
> +{
> +	sunxi_gpio_set_cfgpin(gpio, SUNXI_GPIO_INPUT);
> +
> +	return sunxi_gpio_input(gpio);
> +}
> +
> +int gpio_direction_output(unsigned gpio, int value)
> +{
> +	sunxi_gpio_set_cfgpin(gpio, SUNXI_GPIO_OUTPUT);
> +
> +	return sunxi_gpio_output(gpio, value);
> +}
> +
> +int gpio_get_value(unsigned gpio)
> +{
> +	return sunxi_gpio_input(gpio);
> +}
> +
> +int gpio_set_value(unsigned gpio, int value)
> +{
> +	return sunxi_gpio_output(gpio, value);
> +}
> +
> +int sunxi_name_to_gpio(const char *name)
> +{
> +	int group = 0;
> +	int groupsize = 9 * 32;
> +	long pin;
> +	char *eptr;
> +	if (*name == 'P' || *name == 'p')
> +		name++;
> +	if (*name >= 'A') {
> +		group = *name - (*name > 'a' ? 'a' : 'A');
> +		groupsize = 32;
> +		name++;
> +	}
> +
> +	pin = simple_strtol(name, &eptr, 10);
> +	if (!*name || *eptr)
> +		return -1;
> +	if (pin < 0 || pin > groupsize || group >= 9)
> +		return -1;
> +	return group * 32 + pin;
> +}
> diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h
> index a9d104a..ebb9f7a 100644
> --- a/include/configs/sunxi-common.h
> +++ b/include/configs/sunxi-common.h
> @@ -179,6 +179,10 @@
>  #define CONFIG_CONS_INDEX              1       /* UART0 */
>  #endif
>  
> +/* GPIO */
> +#define CONFIG_SUNXI_GPIO
> +#define CONFIG_CMD_GPIO
> +
>  /* Ethernet support */
>  #ifdef CONFIG_SUNXI_EMAC
>  #define CONFIG_MII			/* MII PHY management		*/
>