/* $NetBSD: cy82c693.c,v 1.11 2024/08/17 14:58:51 thorpej Exp $ */

/*-
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

/*
 * Common routines to read/write control registers on the Cypress 82c693
 * hyperCache(tm) Stand-Alone PCI Peripheral Controller with USB.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: cy82c693.c,v 1.11 2024/08/17 14:58:51 thorpej Exp $");

#include <sys/param.h>
#include <sys/device.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/once.h>

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>

#include <dev/pci/cy82c693reg.h>
#include <dev/pci/cy82c693var.h>

ONCE_DECL(cyhc_once);

static struct cy82c693_handle cyhc_handle;
static int cyhc_initialized;

static kmutex_t cyhc_lock;

static int
cy82c693_onceinit(void)
{

        mutex_init(&cyhc_lock, MUTEX_DEFAULT, IPL_NONE);
        return 0;
}

const struct cy82c693_handle *
cy82c693_init(bus_space_tag_t iot)
{
        bus_space_handle_t ioh;
        int err;

        err = RUN_ONCE(&cyhc_once, cy82c693_onceinit);
        if (err)
                return NULL;
        
        mutex_enter(&cyhc_lock);

        if (cyhc_initialized) {
                mutex_exit(&cyhc_lock);
                KASSERT(bus_space_is_equal(iot, cyhc_handle.cyhc_iot));
                return &cyhc_handle;
        }

        if (bus_space_map(iot, CYHC_CONFIG_ADDR, 2, 0, &ioh) != 0) {
                mutex_exit(&cyhc_lock);
                return NULL;
        }

        cyhc_handle.cyhc_iot = iot;
        cyhc_handle.cyhc_ioh = ioh;

        cyhc_initialized = 1;

        mutex_exit(&cyhc_lock);

        return &cyhc_handle;
}

u_int8_t
cy82c693_read(const struct cy82c693_handle *cyhc, int reg)
{
        uint8_t rv;

        KASSERT(cyhc != NULL);
        KASSERT(cyhc_initialized);

        mutex_enter(&cyhc_lock);

        bus_space_write_1(cyhc->cyhc_iot, cyhc->cyhc_ioh, 0, reg);
        rv = bus_space_read_1(cyhc->cyhc_iot, cyhc->cyhc_ioh, 1);

        mutex_exit(&cyhc_lock);

        return rv;
}

void
cy82c693_write(const struct cy82c693_handle *cyhc, int reg, u_int8_t val)
{

        KASSERT(cyhc != NULL);
        KASSERT(cyhc_initialized);

        mutex_enter(&cyhc_lock);

        bus_space_write_1(cyhc->cyhc_iot, cyhc->cyhc_ioh, 0, reg);
        bus_space_write_1(cyhc->cyhc_iot, cyhc->cyhc_ioh, 1, val);

        mutex_exit(&cyhc_lock);
}