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i.MX31: add a simple gpio driver
This is a minimal driver, so far only managing output. It will be used by the mxc_spi.c driver. Signed-off-by: Guennadi Liakhovetski <lg@denx.de> Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
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3 changed files with 95 additions and 1 deletions
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@ -25,7 +25,8 @@ include $(TOPDIR)/config.mk
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LIB := $(obj)libgpio.a
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LIB := $(obj)libgpio.a
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COBJS-$(CONFIG_PCA953X) += pca953x.o
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COBJS-$(CONFIG_MX31_GPIO) += mx31_gpio.o
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COBJS-$(CONFIG_PCA953X) += pca953x.o
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COBJS := $(COBJS-y)
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COBJS := $(COBJS-y)
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SRCS := $(COBJS:.o=.c)
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SRCS := $(COBJS:.o=.c)
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73
drivers/gpio/mx31_gpio.c
Normal file
73
drivers/gpio/mx31_gpio.c
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@ -0,0 +1,73 @@
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/*
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* Copyright (C) 2009
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* Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/arch/mx31.h>
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#include <asm/arch/mx31-regs.h>
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/* GPIO port description */
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static unsigned long gpio_ports[] = {
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[0] = GPIO1_BASE,
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[1] = GPIO2_BASE,
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[2] = GPIO3_BASE,
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};
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int mx31_gpio_direction(unsigned int gpio, enum mx31_gpio_direction direction)
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{
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unsigned int port = gpio >> 5;
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u32 l;
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if (port >= ARRAY_SIZE(gpio_ports))
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return 1;
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gpio &= 0x1f;
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l = __REG(gpio_ports[port] + GPIO_GDIR);
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switch (direction) {
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case MX31_GPIO_DIRECTION_OUT:
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l |= 1 << gpio;
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break;
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case MX31_GPIO_DIRECTION_IN:
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l &= ~(1 << gpio);
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}
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__REG(gpio_ports[port] + GPIO_GDIR) = l;
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return 0;
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}
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void mx31_gpio_set(unsigned int gpio, unsigned int value)
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{
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unsigned int port = gpio >> 5;
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u32 l;
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if (port >= ARRAY_SIZE(gpio_ports))
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return;
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gpio &= 0x1f;
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l = __REG(gpio_ports[port] + GPIO_DR);
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if (value)
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l |= 1 << gpio;
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else
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l &= ~(1 << gpio);
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__REG(gpio_ports[port] + GPIO_DR) = l;
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}
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@ -27,4 +27,24 @@
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extern u32 mx31_get_ipg_clk(void);
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extern u32 mx31_get_ipg_clk(void);
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extern void mx31_gpio_mux(unsigned long mode);
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extern void mx31_gpio_mux(unsigned long mode);
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enum mx31_gpio_direction {
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MX31_GPIO_DIRECTION_IN,
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MX31_GPIO_DIRECTION_OUT,
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};
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#ifdef CONFIG_MX31_GPIO
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extern int mx31_gpio_direction(unsigned int gpio,
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enum mx31_gpio_direction direction);
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extern void mx31_gpio_set(unsigned int gpio, unsigned int value);
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#else
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static inline int mx31_gpio_direction(unsigned int gpio,
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enum mx31_gpio_direction direction)
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{
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return 1;
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}
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static inline void mx31_gpio_set(unsigned int gpio, unsigned int value)
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{
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}
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#endif
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#endif /* __ASM_ARCH_MX31_H */
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#endif /* __ASM_ARCH_MX31_H */
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