GPIO driver for Allwinner sun4i/sun5i family of SoCs
GPIO Pins are named by their symbolic pin names P<g><#> such as PH19 or H19.
Note: This do not perform any validation if the pin is in use for some other I/O function. Use with care. --- arch/arm/include/asm/arch-sunxi/gpio.h | 2 + drivers/gpio/Makefile | 1 + drivers/gpio/sunxi_gpio.c | 116 ++++++++++++++++++++++++++++++++ include/configs/sunxi-common.h | 4 + 4 files changed, 123 insertions(+), 0 deletions(-) create mode 100644 drivers/gpio/sunxi_gpio.c
diff --git a/arch/arm/include/asm/arch-sunxi/gpio.h b/arch/arm/include/asm/arch-sunxi/gpio.h index fceee6b..a3f8a74 100644 --- a/arch/arm/include/asm/arch-sunxi/gpio.h +++ b/arch/arm/include/asm/arch-sunxi/gpio.h @@ -160,5 +160,7 @@ enum sunxi_gpio_number {
int sunxi_gpio_set_cfgpin(u32 pin, u32 val); int sunxi_gpio_get_cfgpin(u32 pin); +int name_to_gpio(const char *name); +#define name_to_gpio name_to_gpio
#endif /* _SUNXI_GPIO_H */ diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index d50ac3b..6d692e6 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -45,6 +45,7 @@ COBJS-$(CONFIG_OMAP_GPIO) += omap_gpio.o COBJS-$(CONFIG_DB8500_GPIO) += db8500_gpio.o COBJS-$(CONFIG_BCM2835_GPIO) += bcm2835_gpio.o COBJS-$(CONFIG_S3C2440_GPIO) += s3c2440_gpio.o +COBJS-$(CONFIG_SUNXI_GPIO) += sunxi_gpio.o
COBJS := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/gpio/sunxi_gpio.c b/drivers/gpio/sunxi_gpio.c new file mode 100644 index 0000000..d99071e --- /dev/null +++ b/drivers/gpio/sunxi_gpio.c @@ -0,0 +1,116 @@ +/* + * (C) Copyright 2007-2011 + * Allwinner Technology Co., Ltd. <www.allwinnertech.com> + * Tom Cubie tangliang@allwinnertech.com + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#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 = + &((struct sunxi_gpio_reg *)SUNXI_PIO_BASE)->gpio_bank[bank]; + + dat = readl(&pio->dat); + if (val) + dat |= 1 << num; + else + dat &= ~(1 << 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 = + &((struct sunxi_gpio_reg *)SUNXI_PIO_BASE)->gpio_bank[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 name_to_gpio(const char *name) +{ + int group = 0; + int groupsize = 9 * 32; + long pin; + const 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 5bf8eea..bc1f200 100644 --- a/include/configs/sunxi-common.h +++ b/include/configs/sunxi-common.h @@ -206,4 +206,8 @@ /* #define CONFIG_WATCHDOG */ /* #define CONFIG_SUNXI_WATCHDOG */
+/* GPIO */ +#define CONFIG_SUNXI_GPIO +#define CONFIG_CMD_GPIO + #endif /* __CONFIG_H */