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      1 /*	$NetBSD: bus_space.c,v 1.3 2019/12/14 02:58:20 tsutsui Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998 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 of the Numerical Aerospace Simulation Facility,
      9  * NASA Ames Research Center.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     30  * POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 /*
     34  * Implementation of bus_space mapping for the DECstation.
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 __KERNEL_RCSID(0, "$NetBSD: bus_space.c,v 1.3 2019/12/14 02:58:20 tsutsui Exp $");
     39 
     40 #include <sys/param.h>
     41 #include <sys/systm.h>
     42 
     43 #include <machine/bus.h>
     44 
     45 /* ARGSUSED */
     46 int
     47 bus_space_map(
     48 	bus_space_tag_t t,
     49 	bus_addr_t bpa,
     50 	bus_size_t size,
     51 	int flags,
     52 	bus_space_handle_t *bshp)
     53 {
     54 	int cacheable = flags & BUS_SPACE_MAP_CACHEABLE;
     55 
     56 	/* Mappings on the DECstation are always linear. */
     57 	if (cacheable)
     58 		*bshp = MIPS_PHYS_TO_KSEG0(bpa);
     59 	else
     60 		*bshp = MIPS_PHYS_TO_KSEG1(bpa);
     61 	return (0);
     62 }
     63 
     64 /* ARGSUSED */
     65 int
     66 bus_space_alloc(
     67 	bus_space_tag_t t,
     68 	bus_addr_t rstart,
     69 	bus_addr_t rend,
     70 	bus_size_t size,
     71 	bus_size_t alignment,
     72 	bus_size_t boundary,
     73 	int flags,
     74 	bus_addr_t *bpap,
     75 	bus_space_handle_t *bshp)
     76 {
     77 
     78 	/*
     79 	 * Not meaningful on any currently-supported DECstation bus.
     80 	 */
     81 	return (EINVAL);
     82 }
     83 
     84 /* ARGSUSED */
     85 void
     86 bus_space_free(
     87 	bus_space_tag_t t,
     88 	bus_space_handle_t bsh,
     89 	bus_size_t size)
     90 {
     91 
     92 	/*
     93 	 * Not meaningful on any currently-supported DECstation bus.
     94 	 */
     95 	panic("bus_space_free: shouldn't be here");
     96 }
     97 
     98 void
     99 bus_space_unmap(
    100 	bus_space_tag_t t,
    101 	bus_space_handle_t bsh,
    102 	bus_size_t size)
    103 {
    104 
    105 	/* Nothing to do. */
    106 }
    107 
    108 /* ARGSUSED */
    109 int
    110 bus_space_subregion(
    111 	bus_space_tag_t t,
    112 	bus_space_handle_t bsh,
    113 	bus_size_t offset,
    114 	bus_size_t size,
    115 	bus_space_handle_t *nbshp)
    116 {
    117 
    118 	*nbshp = bsh + offset;
    119 	return (0);
    120 }
    121