1/* 2 * arch/arm/plat-iop/gpio.c 3 * GPIO handling for Intel IOP3xx processors. 4 * 5 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or (at 10 * your option) any later version. 11 */ 12 13#include <linux/device.h> 14#include <linux/init.h> 15#include <linux/types.h> 16#include <linux/errno.h> 17#include <linux/gpio.h> 18#include <asm/hardware/iop3xx.h> 19 20void gpio_line_config(int line, int direction) 21{ 22 unsigned long flags; 23 24 local_irq_save(flags); 25 if (direction == GPIO_IN) { 26 *IOP3XX_GPOE |= 1 << line; 27 } else if (direction == GPIO_OUT) { 28 *IOP3XX_GPOE &= ~(1 << line); 29 } 30 local_irq_restore(flags); 31} 32EXPORT_SYMBOL(gpio_line_config); 33 34int gpio_line_get(int line) 35{ 36 return !!(*IOP3XX_GPID & (1 << line)); 37} 38EXPORT_SYMBOL(gpio_line_get); 39 40void gpio_line_set(int line, int value) 41{ 42 unsigned long flags; 43 44 local_irq_save(flags); 45 if (value == GPIO_LOW) { 46 *IOP3XX_GPOD &= ~(1 << line); 47 } else if (value == GPIO_HIGH) { 48 *IOP3XX_GPOD |= 1 << line; 49 } 50 local_irq_restore(flags); 51} 52EXPORT_SYMBOL(gpio_line_set); 53 54static int iop3xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) 55{ 56 gpio_line_config(gpio, GPIO_IN); 57 return 0; 58} 59 60static int iop3xx_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int level) 61{ 62 gpio_line_set(gpio, level); 63 gpio_line_config(gpio, GPIO_OUT); 64 return 0; 65} 66 67static int iop3xx_gpio_get_value(struct gpio_chip *chip, unsigned gpio) 68{ 69 return gpio_line_get(gpio); 70} 71 72static void iop3xx_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value) 73{ 74 gpio_line_set(gpio, value); 75} 76 77static struct gpio_chip iop3xx_chip = { 78 .label = "iop3xx", 79 .direction_input = iop3xx_gpio_direction_input, 80 .get = iop3xx_gpio_get_value, 81 .direction_output = iop3xx_gpio_direction_output, 82 .set = iop3xx_gpio_set_value, 83 .base = 0, 84 .ngpio = IOP3XX_N_GPIOS, 85}; 86 87static int __init iop3xx_gpio_setup(void) 88{ 89 return gpiochip_add(&iop3xx_chip); 90} 91arch_initcall(iop3xx_gpio_setup); 92