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      1 /* $NetBSD: cy82c693.c,v 1.11 2024/08/17 14:58:51 thorpej Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2000 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Common routines to read/write control registers on the Cypress 82c693
     34  * hyperCache(tm) Stand-Alone PCI Peripheral Controller with USB.
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 __KERNEL_RCSID(0, "$NetBSD: cy82c693.c,v 1.11 2024/08/17 14:58:51 thorpej Exp $");
     39 
     40 #include <sys/param.h>
     41 #include <sys/device.h>
     42 #include <sys/systm.h>
     43 #include <sys/bus.h>
     44 #include <sys/once.h>
     45 
     46 #include <dev/pci/pcireg.h>
     47 #include <dev/pci/pcivar.h>
     48 
     49 #include <dev/pci/cy82c693reg.h>
     50 #include <dev/pci/cy82c693var.h>
     51 
     52 ONCE_DECL(cyhc_once);
     53 
     54 static struct cy82c693_handle cyhc_handle;
     55 static int cyhc_initialized;
     56 
     57 static kmutex_t cyhc_lock;
     58 
     59 static int
     60 cy82c693_onceinit(void)
     61 {
     62 
     63 	mutex_init(&cyhc_lock, MUTEX_DEFAULT, IPL_NONE);
     64 	return 0;
     65 }
     66 
     67 const struct cy82c693_handle *
     68 cy82c693_init(bus_space_tag_t iot)
     69 {
     70 	bus_space_handle_t ioh;
     71 	int err;
     72 
     73 	err = RUN_ONCE(&cyhc_once, cy82c693_onceinit);
     74 	if (err)
     75 		return NULL;
     76 
     77 	mutex_enter(&cyhc_lock);
     78 
     79 	if (cyhc_initialized) {
     80 		mutex_exit(&cyhc_lock);
     81 		KASSERT(bus_space_is_equal(iot, cyhc_handle.cyhc_iot));
     82 		return &cyhc_handle;
     83 	}
     84 
     85 	if (bus_space_map(iot, CYHC_CONFIG_ADDR, 2, 0, &ioh) != 0) {
     86 		mutex_exit(&cyhc_lock);
     87 		return NULL;
     88 	}
     89 
     90 	cyhc_handle.cyhc_iot = iot;
     91 	cyhc_handle.cyhc_ioh = ioh;
     92 
     93 	cyhc_initialized = 1;
     94 
     95 	mutex_exit(&cyhc_lock);
     96 
     97 	return &cyhc_handle;
     98 }
     99 
    100 u_int8_t
    101 cy82c693_read(const struct cy82c693_handle *cyhc, int reg)
    102 {
    103 	uint8_t rv;
    104 
    105 	KASSERT(cyhc != NULL);
    106 	KASSERT(cyhc_initialized);
    107 
    108 	mutex_enter(&cyhc_lock);
    109 
    110 	bus_space_write_1(cyhc->cyhc_iot, cyhc->cyhc_ioh, 0, reg);
    111 	rv = bus_space_read_1(cyhc->cyhc_iot, cyhc->cyhc_ioh, 1);
    112 
    113 	mutex_exit(&cyhc_lock);
    114 
    115 	return rv;
    116 }
    117 
    118 void
    119 cy82c693_write(const struct cy82c693_handle *cyhc, int reg, u_int8_t val)
    120 {
    121 
    122 	KASSERT(cyhc != NULL);
    123 	KASSERT(cyhc_initialized);
    124 
    125 	mutex_enter(&cyhc_lock);
    126 
    127 	bus_space_write_1(cyhc->cyhc_iot, cyhc->cyhc_ioh, 0, reg);
    128 	bus_space_write_1(cyhc->cyhc_iot, cyhc->cyhc_ioh, 1, val);
    129 
    130 	mutex_exit(&cyhc_lock);
    131 }
    132