/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#ifndef __GPIOBUS_H__
#define __GPIOBUS_H__

#include "opt_platform.h"

#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/rman.h>

#ifdef FDT
#include <dev/ofw/ofw_bus_subr.h>
#endif

#ifdef  INTRNG
#include <sys/intr.h>
#endif

#include "gpio_if.h"

#ifdef FDT
#define GPIOBUS_IVAR(d) (struct gpiobus_ivar *)                         \
        &((struct ofw_gpiobus_devinfo *)device_get_ivars(d))->opd_dinfo
#else
#define GPIOBUS_IVAR(d) (struct gpiobus_ivar *) device_get_ivars(d)
#endif
#define GPIOBUS_SOFTC(d) (struct gpiobus_softc *) device_get_softc(d)
#define GPIOBUS_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
#define GPIOBUS_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
#define GPIOBUS_LOCK_INIT(_sc) mtx_init(&_sc->sc_mtx,                   \
            device_get_nameunit(_sc->sc_dev), "gpiobus", MTX_DEF)
#define GPIOBUS_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx)
#define GPIOBUS_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED)
#define GPIOBUS_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED)

#define GPIOBUS_WAIT            1
#define GPIOBUS_DONTWAIT        2

/* Use default interrupt mode -  for gpio_alloc_intr_resource */
#define GPIO_INTR_CONFORM       GPIO_INTR_NONE

struct gpiobus_pin_data
{
        int             mapped;         /* pin is mapped/reserved. */
        char            *name;          /* pin name. */
};

#ifdef INTRNG
struct intr_map_data_gpio {
        struct intr_map_data    hdr;
        u_int                   gpio_pin_num;
        u_int                   gpio_pin_flags;
        u_int                   gpio_intr_mode;
};
#endif

struct gpiobus_softc
{
        struct mtx      sc_mtx;         /* bus mutex */
        struct rman     sc_intr_rman;   /* isr resources */
        device_t        sc_busdev;      /* bus device */
        device_t        sc_owner;       /* bus owner */
        device_t        sc_dev;         /* driver device */
        int             sc_npins;       /* total pins on bus */
        struct gpiobus_pin_data *sc_pins; /* pin data */
};

struct gpiobus_pin
{
        device_t        dev;    /* gpio device */
        uint32_t        flags;  /* pin flags */
        uint32_t        pin;    /* pin number */
};
typedef struct gpiobus_pin *gpio_pin_t;

struct gpiobus_ivar
{
        struct resource_list    rl;     /* isr resource list */
        uint32_t        npins;  /* pins total */
        uint32_t        *pins;  /* pins map */
};

enum gpiobus_ivars {
        GPIOBUS_IVAR_NPINS      = BUS_IVARS_GPIOBUS,
        GPIOBUS_IVAR_PINS,
};

#define GPIOBUS_ACCESSOR(var, ivar, type)                                 \
        __BUS_ACCESSOR(gpiobus, var, GPIOBUS, ivar, type)

GPIOBUS_ACCESSOR(npins,         NPINS,          uint32_t)
GPIOBUS_ACCESSOR(pins,          PINS,           const uint32_t *)

#undef GPIOBUS_ACCESSOR

#ifdef FDT
struct ofw_gpiobus_devinfo {
        struct gpiobus_ivar     opd_dinfo;
        struct ofw_bus_devinfo  opd_obdinfo;
};

static __inline int
gpio_map_gpios(device_t bus, phandle_t dev, phandle_t gparent, int gcells,
    pcell_t *gpios, uint32_t *pin, uint32_t *flags)
{
        return (GPIO_MAP_GPIOS(bus, dev, gparent, gcells, gpios, pin, flags));
}

device_t ofw_gpiobus_add_fdt_child(device_t, const char *, phandle_t);
int ofw_gpiobus_parse_gpios(device_t, char *, struct gpiobus_pin **);
void ofw_gpiobus_register_provider(device_t);
void ofw_gpiobus_unregister_provider(device_t);

/* Acquire a pin by parsing FDT data. */
int gpio_pin_get_by_ofw_name(device_t consumer, phandle_t node,
    char *name, gpio_pin_t *gpio);
int gpio_pin_get_by_ofw_idx(device_t consumer, phandle_t node,
    int idx, gpio_pin_t *gpio);
int gpio_pin_get_by_ofw_property(device_t consumer, phandle_t node,
    char *name, gpio_pin_t *gpio);
int gpio_pin_get_by_ofw_propidx(device_t consumer, phandle_t node,
    char *name, int idx, gpio_pin_t *gpio);
#endif /* FDT */

/* Acquire a pin by bus and pin number. */
int gpio_pin_get_by_bus_pinnum(device_t _bus, uint32_t _pinnum, gpio_pin_t *_gp);

/* Acquire a pin by child and index (used by direct children of gpiobus). */
int gpio_pin_get_by_child_index(device_t _child, uint32_t _idx, gpio_pin_t *_gp);

/* Acquire a pin from an existing gpio_pin_t. */
int gpio_pin_acquire(gpio_pin_t gpio);
/* Release a pin acquired via any gpio_pin_get_xxx() function. */
void gpio_pin_release(gpio_pin_t gpio);

/* Work with gpio pins acquired using the functions above. */
int gpio_pin_getcaps(gpio_pin_t pin, uint32_t *caps);
int gpio_pin_is_active(gpio_pin_t pin, bool *active);
int gpio_pin_set_active(gpio_pin_t pin, bool active);
int gpio_pin_setflags(gpio_pin_t pin, uint32_t flags);
struct resource *gpio_alloc_intr_resource(device_t consumer_dev, int rid,
    u_int alloc_flags, gpio_pin_t pin, uint32_t intr_mode);

int gpio_check_flags(uint32_t, uint32_t);
device_t gpiobus_add_bus(device_t);
int gpiobus_detach_bus(device_t);

#endif  /* __GPIOBUS_H__ */