/* * arch/arm/plat-iop/gpio.c * GPIO handling for Intel IOP3xx processors. * * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org> * * 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. */ #include <linux/device.h> #include <linux/init.h> #include <linux/types.h> #include <linux/errno.h> #include <linux/gpio.h> #include <asm/hardware/iop3xx.h> void gpio_line_config(int line, int direction) { unsigned long flags; local_irq_save(flags); if (direction == GPIO_IN) { *IOP3XX_GPOE |= 1 << line; } else if (direction == GPIO_OUT) { *IOP3XX_GPOE &= ~(1 << line); } local_irq_restore(flags); } EXPORT_SYMBOL(gpio_line_config); int gpio_line_get(int line) { return !!(*IOP3XX_GPID & (1 << line)); } EXPORT_SYMBOL(gpio_line_get); void gpio_line_set(int line, int value) { unsigned long flags; local_irq_save(flags); if (value == GPIO_LOW) { *IOP3XX_GPOD &= ~(1 << line); } else if (value == GPIO_HIGH) { *IOP3XX_GPOD |= 1 << line; } local_irq_restore(flags); } EXPORT_SYMBOL(gpio_line_set); static int iop3xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) { gpio_line_config(gpio, GPIO_IN); return 0; } static int iop3xx_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int level) { gpio_line_set(gpio, level); gpio_line_config(gpio, GPIO_OUT); return 0; } static int iop3xx_gpio_get_value(struct gpio_chip *chip, unsigned gpio) { return gpio_line_get(gpio); } static void iop3xx_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value) { gpio_line_set(gpio, value); } static struct gpio_chip iop3xx_chip = { .label = "iop3xx", .direction_input = iop3xx_gpio_direction_input, .get = iop3xx_gpio_get_value, .direction_output = iop3xx_gpio_direction_output, .set = iop3xx_gpio_set_value, .base = 0, .ngpio = IOP3XX_N_GPIOS, }; static int __init iop3xx_gpio_setup(void) { return gpiochip_add(&iop3xx_chip); } arch_initcall(iop3xx_gpio_setup);