mirror of
https://github.com/AsahiLinux/u-boot
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102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
/*
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* Copyright (C) 2012 Stefan Roese <sr@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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/*
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* Driver for SPEAr600 GPIO controller
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*/
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#include <common.h>
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#include <asm/arch/hardware.h>
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#include <asm/gpio.h>
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#include <asm/io.h>
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#include <errno.h>
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static int gpio_direction(unsigned gpio,
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enum gpio_direction direction)
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{
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struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
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u32 val;
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val = readl(®s->gpiodir);
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if (direction == GPIO_DIRECTION_OUT)
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val |= 1 << gpio;
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else
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val &= ~(1 << gpio);
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writel(val, ®s->gpiodir);
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return 0;
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}
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int gpio_set_value(unsigned gpio, int value)
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{
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struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
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writel(1 << gpio, ®s->gpiodata[DATA_REG_ADDR(gpio)]);
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return 0;
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}
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int gpio_get_value(unsigned gpio)
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{
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struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
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u32 val;
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val = readl(®s->gpiodata[DATA_REG_ADDR(gpio)]);
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return !!val;
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}
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int gpio_request(unsigned gpio, const char *label)
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{
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if (gpio >= SPEAR_GPIO_COUNT)
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return -EINVAL;
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return 0;
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}
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int gpio_free(unsigned gpio)
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{
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return 0;
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}
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void gpio_toggle_value(unsigned gpio)
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{
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gpio_set_value(gpio, !gpio_get_value(gpio));
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}
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int gpio_direction_input(unsigned gpio)
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{
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return gpio_direction(gpio, GPIO_DIRECTION_IN);
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}
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int gpio_direction_output(unsigned gpio, int value)
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{
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int ret = gpio_direction(gpio, GPIO_DIRECTION_OUT);
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if (ret < 0)
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return ret;
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gpio_set_value(gpio, value);
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return 0;
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}
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