93 lines
2.1 KiB
C
93 lines
2.1 KiB
C
/*
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* arch/arm/plat-iop/gpio.c
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* GPIO handling for Intel IOP3xx processors.
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*
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* Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*/
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/gpio.h>
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#include <linux/export.h>
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#include <asm/hardware/iop3xx.h>
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void gpio_line_config(int line, int direction)
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{
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unsigned long flags;
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local_irq_save(flags);
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if (direction == GPIO_IN) {
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*IOP3XX_GPOE |= 1 << line;
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} else if (direction == GPIO_OUT) {
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*IOP3XX_GPOE &= ~(1 << line);
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}
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(gpio_line_config);
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int gpio_line_get(int line)
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{
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return !!(*IOP3XX_GPID & (1 << line));
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}
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EXPORT_SYMBOL(gpio_line_get);
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void gpio_line_set(int line, int value)
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{
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unsigned long flags;
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local_irq_save(flags);
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if (value == GPIO_LOW) {
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*IOP3XX_GPOD &= ~(1 << line);
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} else if (value == GPIO_HIGH) {
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*IOP3XX_GPOD |= 1 << line;
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}
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(gpio_line_set);
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static int iop3xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
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{
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gpio_line_config(gpio, GPIO_IN);
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return 0;
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}
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static int iop3xx_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int level)
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{
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gpio_line_set(gpio, level);
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gpio_line_config(gpio, GPIO_OUT);
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return 0;
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}
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static int iop3xx_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
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{
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return gpio_line_get(gpio);
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}
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static void iop3xx_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
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{
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gpio_line_set(gpio, value);
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}
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static struct gpio_chip iop3xx_chip = {
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.label = "iop3xx",
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.direction_input = iop3xx_gpio_direction_input,
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.get = iop3xx_gpio_get_value,
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.direction_output = iop3xx_gpio_direction_output,
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.set = iop3xx_gpio_set_value,
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.base = 0,
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.ngpio = IOP3XX_N_GPIOS,
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};
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static int __init iop3xx_gpio_setup(void)
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{
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return gpiochip_add(&iop3xx_chip);
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}
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arch_initcall(iop3xx_gpio_setup);
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