linux-imx

/*

 * Xilinx gpio driver for xps/axi_gpio IP.

 *

 * Copyright 2008 - 2013 Xilinx, Inc.

 *

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

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

 * as published by the Free Software Foundation.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

​

#include <linux/bitops.h>

#include <linux/init.h>

#include <linux/errno.h>

#include <linux/module.h>

#include <linux/of_device.h>

#include <linux/of_platform.h>

#include <linux/of_gpio.h>

#include <linux/io.h>

#include <linux/gpio/driver.h>

#include <linux/slab.h>

​

/* Register Offset Definitions */

#define XGPIO_DATA_OFFSET   (0x0)   /* Data register  */

#define XGPIO_TRI_OFFSET    (0x4)   /* I/O direction register  */

​

#define XGPIO_CHANNEL_OFFSET    0x8

​

/* Read/Write access to the GPIO registers */

#if defined(CONFIG_ARCH_ZYNQ) || defined(CONFIG_X86)

# define xgpio_readreg(offset)      readl(offset)

# define xgpio_writereg(offset, val)    writel(val, offset)

#else

# define xgpio_readreg(offset)      __raw_readl(offset)

# define xgpio_writereg(offset, val)    __raw_writel(val, offset)

#endif

​

/**

 * struct xgpio_instance - Stores information about GPIO device

 * @mmchip: OF GPIO chip for memory mapped banks

 * @gpio_width: GPIO width for every channel

 * @gpio_state: GPIO state shadow register

 * @gpio_dir: GPIO direction shadow register

 * @gpio_lock: Lock used for synchronization

 */

struct xgpio_instance {

    struct of_mm_gpio_chip mmchip;

    unsigned int gpio_width[2];

    u32 gpio_state[2];

    u32 gpio_dir[2];

    spinlock_t gpio_lock[2];

};

​

static inline int xgpio_index(struct xgpio_instance *chip, int gpio)

{

    if (gpio >= chip->gpio_width[0])

        return 1;

​

    return 0;

}