linux-imx

/*

 * Driver for GE FPGA based GPIO

 *

 * Author: Martyn Welch <martyn.welch@ge.com>

 *

 * 2008 (c) GE Intelligent Platforms Embedded Systems, Inc.

 *

 * This file is licensed under the terms of the GNU General Public License

 * version 2.  This program is licensed "as is" without any warranty of any

 * kind, whether express or implied.

 */

​

/* TODO

 *

 * Configuration of output modes (totem-pole/open-drain)

 * Interrupt configuration - interrupts are always generated the FPGA relies on

 * the I/O interrupt controllers mask to stop them propergating

 */

​

#include <linux/kernel.h>

#include <linux/io.h>

#include <linux/slab.h>

#include <linux/of_device.h>

#include <linux/of_address.h>

#include <linux/module.h>

#include <linux/gpio/driver.h>

​

#define GEF_GPIO_DIRECT     0x00

#define GEF_GPIO_IN     0x04

#define GEF_GPIO_OUT        0x08

#define GEF_GPIO_TRIG       0x0C

#define GEF_GPIO_POLAR_A    0x10

#define GEF_GPIO_POLAR_B    0x14

#define GEF_GPIO_INT_STAT   0x18

#define GEF_GPIO_OVERRUN    0x1C

#define GEF_GPIO_MODE       0x20

​

static const struct of_device_id gef_gpio_ids[] = {

    {

        .compatible = "gef,sbc610-gpio",

        .data       = (void *)19,

    }, {

        .compatible = "gef,sbc310-gpio",

        .data       = (void *)6,

    }, {

        .compatible = "ge,imp3a-gpio",

        .data       = (void *)16,

    },

    { }

};

MODULE_DEVICE_TABLE(of, gef_gpio_ids);

​

static int __init gef_gpio_probe(struct platform_device *pdev)

{

    struct gpio_chip *gc;

    void __iomem *regs;

    int ret;

​

    gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);

    if (!gc)

        return -ENOMEM;

​

    regs = of_iomap(pdev->dev.of_node, 0);