linux-imx

/*

 * Driver for Aeroflex Gaisler GRGPIO General Purpose I/O cores.

 *

 * 2013 (c) Aeroflex Gaisler AB

 *

 * This driver supports the GRGPIO GPIO core available in the GRLIB VHDL

 * IP core library.

 *

 * Full documentation of the GRGPIO core can be found here:

 * http://www.gaisler.com/products/grlib/grip.pdf

 *

 * See "Documentation/devicetree/bindings/gpio/gpio-grgpio.txt" for

 * information on open firmware properties.

 *

 * 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.

 *

 * Contributors: Andreas Larsson <andreas@gaisler.com>

 */

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/spinlock.h>

#include <linux/io.h>

#include <linux/of.h>

#include <linux/of_platform.h>

#include <linux/gpio/driver.h>

#include <linux/slab.h>

#include <linux/err.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/irqdomain.h>

#include <linux/bitops.h>

​

#define GRGPIO_MAX_NGPIO 32

​

#define GRGPIO_DATA     0x00

#define GRGPIO_OUTPUT       0x04

#define GRGPIO_DIR      0x08

#define GRGPIO_IMASK        0x0c

#define GRGPIO_IPOL     0x10

#define GRGPIO_IEDGE        0x14

#define GRGPIO_BYPASS       0x18

#define GRGPIO_IMAP_BASE    0x20

​

/* Structure for an irq of the core - called an underlying irq */

struct grgpio_uirq {

    u8 refcnt; /* Reference counter to manage requesting/freeing of uirq */

    u8 uirq; /* Underlying irq of the gpio driver */

};

​

/*

 * Structure for an irq of a gpio line handed out by this driver. The index is

 * used to map to the corresponding underlying irq.

 */

struct grgpio_lirq {

    s8 index; /* Index into struct grgpio_priv's uirqs, or -1 */

    u8 irq; /* irq for the gpio line */

};

​