linux-imx

/*

 * AMD CS5535/CS5536 GPIO driver

 * Copyright (C) 2006  Advanced Micro Devices, Inc.

 * Copyright (C) 2007-2009  Andres Salomon <dilinger@collabora.co.uk>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of version 2 of the GNU General Public License

 * as published by the Free Software Foundation.

 */

​

#include <linux/kernel.h>

#include <linux/spinlock.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/gpio/driver.h>

#include <linux/io.h>

#include <linux/cs5535.h>

#include <asm/msr.h>

​

#define DRV_NAME "cs5535-gpio"

​

/*

 * Some GPIO pins

 *  31-29,23 : reserved (always mask out)

 *  28       : Power Button

 *  26       : PME#

 *  22-16    : LPC

 *  14,15    : SMBus

 *  9,8      : UART1

 *  7        : PCI INTB

 *  3,4      : UART2/DDC

 *  2        : IDE_IRQ0

 *  1        : AC_BEEP

 *  0        : PCI INTA

 *

 * If a mask was not specified, allow all except

 * reserved and Power Button

 */

#define GPIO_DEFAULT_MASK 0x0F7FFFFF

​

static ulong mask = GPIO_DEFAULT_MASK;

module_param_named(mask, mask, ulong, 0444);

MODULE_PARM_DESC(mask, "GPIO channel mask.");

​

/*

 * FIXME: convert this singleton driver to use the state container

 * design pattern, see Documentation/driver-model/design-patterns.txt

 */

static struct cs5535_gpio_chip {

    struct gpio_chip chip;

    resource_size_t base;

​

    struct platform_device *pdev;

    spinlock_t lock;

} cs5535_gpio_chip;

​

/*

 * The CS5535/CS5536 GPIOs support a number of extra features not defined

 * by the gpio_chip API, so these are exported.  For a full list of the

 * registers, see include/linux/cs5535.h.

 */

​

static void errata_outl(struct cs5535_gpio_chip *chip, u32 val,