linux-imx

/*

 * Copyright (C) 2014-2017 Broadcom

 *

 * 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 version 2.

 *

 * This program is distributed "as is" WITHOUT ANY WARRANTY of any

 * kind, whether express or implied; without even the implied warranty

 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

​

/*

 * Broadcom Cygnus IOMUX driver

 *

 * This file contains the Cygnus IOMUX driver that supports group based PINMUX

 * configuration. Although PINMUX configuration is mainly group based, the

 * Cygnus IOMUX controller allows certain pins to be individually muxed to GPIO

 * function, and therefore be controlled by the Cygnus ASIU GPIO controller

 */

​

#include <linux/err.h>

#include <linux/io.h>

#include <linux/of.h>

#include <linux/slab.h>

#include <linux/platform_device.h>

#include <linux/pinctrl/pinctrl.h>

#include <linux/pinctrl/pinmux.h>

#include <linux/pinctrl/pinconf.h>

#include <linux/pinctrl/pinconf-generic.h>

#include "../core.h"

#include "../pinctrl-utils.h"

​

#define CYGNUS_NUM_IOMUX_REGS     8

#define CYGNUS_NUM_MUX_PER_REG    8

#define CYGNUS_NUM_IOMUX          (CYGNUS_NUM_IOMUX_REGS * \

                   CYGNUS_NUM_MUX_PER_REG)

​

/*

 * Cygnus IOMUX register description

 *

 * @offset: register offset for mux configuration of a group

 * @shift: bit shift for mux configuration of a group

 * @alt: alternate function to set to

 */

struct cygnus_mux {

    unsigned int offset;

    unsigned int shift;

    unsigned int alt;

};

​

/*

 * Keep track of Cygnus IOMUX configuration and prevent double configuration

 *

 * @cygnus_mux: Cygnus IOMUX register description

 * @is_configured: flag to indicate whether a mux setting has already been

 * configured

 */

struct cygnus_mux_log {

    struct cygnus_mux mux;

    bool is_configured;

};

​

/*

 * Group based IOMUX configuration

 *

 * @name: name of the group

 * @pins: array of pins used by this group

 * @num_pins: total number of pins used by this group

 * @mux: Cygnus group based IOMUX configuration

 */

struct cygnus_pin_group {

    const char *name;

    const unsigned *pins;

    unsigned num_pins;

    struct cygnus_mux mux;

};

​

/*

 * Cygnus mux function and supported pin groups

 *

 * @name: name of the function

 * @groups: array of groups that can be supported by this function

 * @num_groups: total number of groups that can be supported by this function

 */

struct cygnus_pin_function {

    const char *name;

    const char * const *groups;

    unsigned num_groups;

};

​