Home | History | Annotate | Line # | Download | only in news68k 
      1 /*	$NetBSD: bus_space.c,v 1.14 2023/04/22 10:09:12 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.
      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  * Implementation of bus_space mapping for the news68k.
     34  * Just taken from hp300.
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 __KERNEL_RCSID(0, "$NetBSD: bus_space.c,v 1.14 2023/04/22 10:09:12 tsutsui Exp $");
     39 
     40 #include <sys/param.h>
     41 #include <sys/systm.h>
     42 
     43 #include <machine/bus.h>
     44 
     45 #include <uvm/uvm_extern.h>
     46 
     47 extern int *nofault;
     48 
     49 int
     50 bus_space_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, int flags,
     51     bus_space_handle_t *bshp)
     52 {
     53 
     54 	if (t == NEWS68K_BUS_SPACE_INTIO) {
     55 		/*
     56 		 * Intio space is direct-mapped in pmap_bootstrap(); just
     57 		 * do the translation.
     58 		 */
     59 		*bshp = (bus_space_handle_t)bpa;
     60 		return 0;
     61 	}
     62 
     63 	if (t == NEWS68K_BUS_SPACE_EIO) {
     64 		*bshp = (bus_space_handle_t)bpa; /* XXX use tt0 mapping */
     65 		return 0;
     66 	}
     67 
     68 	return 1;
     69 }
     70 
     71 int
     72 bus_space_alloc(bus_space_tag_t t, bus_addr_t rstart, bus_addr_t rend,
     73     bus_size_t size, bus_size_t alignment, bus_size_t boundary, int flags,
     74     bus_addr_t *bpap, bus_space_handle_t *bshp)
     75 {
     76 
     77 	/*
     78 	 * Not meaningful on any currently-supported news68k bus.
     79 	 */
     80 	return EINVAL;
     81 }
     82 
     83 void
     84 bus_space_free(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
     85 {
     86 
     87 	/*
     88 	 * Not meaningful on any currently-supported news68k bus.
     89 	 */
     90 	panic("bus_space_free: shouldn't be here");
     91 }
     92 
     93 void
     94 bus_space_unmap(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
     95 {
     96 
     97 	if (t == NEWS68K_BUS_SPACE_INTIO) {
     98 		/*
     99 		 * Intio space is direct-mapped in pmap_bootstrap(); nothing
    100 		 * to do
    101 		 */
    102 		return;
    103 	}
    104 
    105 	if (t != NEWS68K_BUS_SPACE_EIO)
    106 		panic("bus_space_map: bad space tag");
    107 
    108 	return;
    109 }
    110 
    111 int
    112 bus_space_subregion(bus_space_tag_t t, bus_space_handle_t bsh,
    113     bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp)
    114 {
    115 
    116 	*nbshp = bsh + offset;
    117 	return 0;
    118 }
    119 
    120 int
    121 news68k_bus_space_probe(bus_space_tag_t t, bus_space_handle_t bsh,
    122     bus_size_t offset, int sz)
    123 {
    124 	label_t faultbuf;
    125 	int i;
    126 
    127 	nofault = (int *)&faultbuf;
    128 	if (setjmp((label_t *)nofault)) {
    129 		nofault = NULL;
    130 		return 0;
    131 	}
    132 
    133 	switch (sz) {
    134 	case 1:
    135 		i = bus_space_read_1(t, bsh, offset);
    136 		break;
    137 
    138 	case 2:
    139 		i = bus_space_read_2(t, bsh, offset);
    140 		break;
    141 
    142 	case 4:
    143 		i = bus_space_read_4(t, bsh, offset);
    144 		break;
    145 
    146 	default:
    147 		panic("bus_space_probe: unupported data size %d", sz);
    148 		/* NOTREACHED */
    149 	}
    150 	__USE(i);
    151 	nofault = NULL;
    152 	return 1;
    153 }
    154