diff options
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/Makefile | 3 | ||||
| -rw-r--r-- | drivers/gpio/mx31_gpio.c | 73 |
2 files changed, 75 insertions, 1 deletions
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index dd618ed..f10144f 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -25,7 +25,8 @@ include $(TOPDIR)/config.mk LIB := $(obj)libgpio.a -COBJS-$(CONFIG_PCA953X) += pca953x.o +COBJS-$(CONFIG_MX31_GPIO) += mx31_gpio.o +COBJS-$(CONFIG_PCA953X) += pca953x.o COBJS := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/gpio/mx31_gpio.c b/drivers/gpio/mx31_gpio.c new file mode 100644 index 0000000..737aafa --- /dev/null +++ b/drivers/gpio/mx31_gpio.c @@ -0,0 +1,73 @@ +/* + * Copyright (C) 2009 + * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de> + * + * 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/arch/mx31.h> +#include <asm/arch/mx31-regs.h> + +/* GPIO port description */ +static unsigned long gpio_ports[] = { + [0] = GPIO1_BASE, + [1] = GPIO2_BASE, + [2] = GPIO3_BASE, +}; + +int mx31_gpio_direction(unsigned int gpio, enum mx31_gpio_direction direction) +{ + unsigned int port = gpio >> 5; + u32 l; + + if (port >= ARRAY_SIZE(gpio_ports)) + return 1; + + gpio &= 0x1f; + + l = __REG(gpio_ports[port] + GPIO_GDIR); + switch (direction) { + case MX31_GPIO_DIRECTION_OUT: + l |= 1 << gpio; + break; + case MX31_GPIO_DIRECTION_IN: + l &= ~(1 << gpio); + } + __REG(gpio_ports[port] + GPIO_GDIR) = l; + + return 0; +} + +void mx31_gpio_set(unsigned int gpio, unsigned int value) +{ + unsigned int port = gpio >> 5; + u32 l; + + if (port >= ARRAY_SIZE(gpio_ports)) + return; + + gpio &= 0x1f; + + l = __REG(gpio_ports[port] + GPIO_DR); + if (value) + l |= 1 << gpio; + else + l &= ~(1 << gpio); + __REG(gpio_ports[port] + GPIO_DR) = l; +} |