/* $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);
}