137 lines
3.5 KiB
C
137 lines
3.5 KiB
C
/* $NetBSD: cy82c693.c,v 1.10 2018/06/06 01:49:08 maya Exp $ */
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/*-
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* Copyright (c) 2000 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Common routines to read/write control registers on the Cypress 82c693
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* hyperCache(tm) Stand-Alone PCI Peripheral Controller with USB.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: cy82c693.c,v 1.10 2018/06/06 01:49:08 maya Exp $");
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#include <sys/param.h>
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#include <sys/device.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/once.h>
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#include <dev/pci/pcireg.h>
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#include <dev/pci/pcivar.h>
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#include <dev/pci/cy82c693reg.h>
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#include <dev/pci/cy82c693var.h>
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ONCE_DECL(cyhc_once);
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static struct cy82c693_handle cyhc_handle;
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static int cyhc_initialized;
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static kmutex_t cyhc_slock;
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static int
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cy82c693_onceinit(void)
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{
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mutex_init(&cyhc_slock, MUTEX_DEFAULT, IPL_HIGH);
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return 0;
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}
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const struct cy82c693_handle *
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cy82c693_init(bus_space_tag_t iot)
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{
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bus_space_handle_t ioh;
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int err;
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err = RUN_ONCE(&cyhc_once, cy82c693_onceinit);
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if (err)
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return NULL;
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mutex_spin_enter(&cyhc_slock);
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if (cyhc_initialized) {
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mutex_spin_exit(&cyhc_slock);
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KASSERT(bus_space_is_equal(iot, cyhc_handle.cyhc_iot));
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return &cyhc_handle;
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}
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if (bus_space_map(iot, CYHC_CONFIG_ADDR, 2, 0, &ioh) != 0) {
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mutex_spin_exit(&cyhc_slock);
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return NULL;
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}
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cyhc_handle.cyhc_iot = iot;
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cyhc_handle.cyhc_ioh = ioh;
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cyhc_initialized = 1;
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mutex_spin_exit(&cyhc_slock);
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return &cyhc_handle;
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}
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u_int8_t
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cy82c693_read(const struct cy82c693_handle *cyhc, int reg)
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{
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uint8_t rv;
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mutex_spin_enter(&cyhc_slock);
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if (cyhc_initialized == 0) {
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mutex_spin_exit(&cyhc_slock);
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panic("cy82c693_read");
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}
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bus_space_write_1(cyhc->cyhc_iot, cyhc->cyhc_ioh, 0, reg);
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rv = bus_space_read_1(cyhc->cyhc_iot, cyhc->cyhc_ioh, 1);
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mutex_spin_exit(&cyhc_slock);
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return rv;
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}
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void
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cy82c693_write(const struct cy82c693_handle *cyhc, int reg, u_int8_t val)
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{
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mutex_spin_enter(&cyhc_slock);
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if (cyhc_initialized == 0) {
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mutex_spin_exit(&cyhc_slock);
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panic("cy82c693_write");
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}
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bus_space_write_1(cyhc->cyhc_iot, cyhc->cyhc_ioh, 0, reg);
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bus_space_write_1(cyhc->cyhc_iot, cyhc->cyhc_ioh, 1, val);
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mutex_spin_exit(&cyhc_slock);
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}
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