linux-imx

/*

 * Emma Mobile GPIO Support - GIO

 *

 *  Copyright (C) 2012 Magnus Damm

 *

 * 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

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * 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/init.h>

#include <linux/platform_device.h>

#include <linux/spinlock.h>

#include <linux/interrupt.h>

#include <linux/ioport.h>

#include <linux/io.h>

#include <linux/irq.h>

#include <linux/irqdomain.h>

#include <linux/bitops.h>

#include <linux/err.h>

#include <linux/gpio/driver.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/pinctrl/consumer.h>

​

struct em_gio_priv {

    void __iomem *base0;

    void __iomem *base1;

    spinlock_t sense_lock;

    struct platform_device *pdev;

    struct gpio_chip gpio_chip;

    struct irq_chip irq_chip;

    struct irq_domain *irq_domain;

};

​

#define GIO_E1 0x00

#define GIO_E0 0x04

#define GIO_EM 0x04

#define GIO_OL 0x08

#define GIO_OH 0x0c

#define GIO_I 0x10

#define GIO_IIA 0x14

#define GIO_IEN 0x18

#define GIO_IDS 0x1c

#define GIO_IIM 0x1c

#define GIO_RAW 0x20

#define GIO_MST 0x24

#define GIO_IIR 0x28

​

#define GIO_IDT0 0x40

#define GIO_IDT1 0x44

#define GIO_IDT2 0x48

#define GIO_IDT3 0x4c

#define GIO_RAWBL 0x50

#define GIO_RAWBH 0x54

#define GIO_IRBL 0x58

#define GIO_IRBH 0x5c

​

#define GIO_IDT(n) (GIO_IDT0 + ((n) * 4))

​

static inline unsigned long em_gio_read(struct em_gio_priv *p, int offs)

{

    if (offs < GIO_IDT0)

        return ioread32(p->base0 + offs);

    else

        return ioread32(p->base1 + (offs - GIO_IDT0));

}

​

static inline void em_gio_write(struct em_gio_priv *p, int offs,

                unsigned long value)

{

    if (offs < GIO_IDT0)

        iowrite32(value, p->base0 + offs);

    else

        iowrite32(value, p->base1 + (offs - GIO_IDT0));

}

​

static void em_gio_irq_disable(struct irq_data *d)

{

    struct em_gio_priv *p = irq_data_get_irq_chip_data(d);

​

    em_gio_write(p, GIO_IDS, BIT(irqd_to_hwirq(d)));

}