Eric Lee / smarc-fsl-linux-kernel

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arch/arm/plat-iop/gpio.c 2.12 KB
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72edd84a6   Lennert Buytenhek   [ARM] 3827/1: iop... 
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  /*
   * 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>
63f385cd1   Arnaud Patard   [ARM] 5160/1: IOP... 
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  #include <linux/init.h>
  #include <linux/types.h>
  #include <linux/errno.h>
  #include <linux/gpio.h>
dc28094b9   Paul Gortmaker   arm: Add export.h... 
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  #include <linux/export.h>
72edd84a6   Lennert Buytenhek   [ARM] 3827/1: iop... 
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  #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);
63f385cd1   Arnaud Patard   [ARM] 5160/1: IOP... 
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  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);