1/*	$NetBSD: obio_space.c,v 1.6 2003/07/15 00:25:05 lukem Exp $	*/
2
3/*-
4 * Copyright (c) 2001, 2002, 2003 Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *	This product includes software developed for the NetBSD Project by
20 *	Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 *    or promote products derived from this software without specific prior
23 *    written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD$");
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/bus.h>
44#include <sys/kernel.h>
45#include <sys/malloc.h>
46#include <sys/devmap.h>
47
48#include <vm/vm.h>
49#include <vm/pmap.h>
50#include <vm/vm_kern.h>
51#include <vm/vm_extern.h>
52
53#include <machine/bus.h>
54#include <machine/cpufunc.h>
55
56void
57generic_bs_unimplemented(void)
58{
59
60	panic("unimplemented bus_space function called");
61}
62
63/* Prototypes for all the bus_space structure functions */
64bs_protos(generic);
65
66int
67generic_bs_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, int flags,
68    bus_space_handle_t *bshp)
69{
70	void *va;
71
72	/*
73	 * We don't even examine the passed-in flags.  For ARM, the CACHEABLE
74	 * flag doesn't make sense (we create VM_MEMATTR_DEVICE mappings), and
75	 * the LINEAR flag is just implied because we use kva_alloc(size).
76	 */
77	if ((va = pmap_mapdev(bpa, size)) == NULL)
78		return (ENOMEM);
79	*bshp = (bus_space_handle_t)va;
80	return (0);
81}
82
83int
84generic_bs_alloc(bus_space_tag_t t, bus_addr_t rstart, bus_addr_t rend, bus_size_t size,
85    bus_size_t alignment, bus_size_t boundary, int flags, bus_addr_t *bpap,
86    bus_space_handle_t *bshp)
87{
88
89	panic("generic_bs_alloc(): not implemented");
90}
91
92
93void
94generic_bs_unmap(bus_space_tag_t t, bus_space_handle_t h, bus_size_t size)
95{
96
97	pmap_unmapdev((vm_offset_t)h, size);
98}
99
100void
101generic_bs_free(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
102{
103
104	panic("generic_bs_free(): not implemented");
105}
106
107int
108generic_bs_subregion(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset,
109    bus_size_t size, bus_space_handle_t *nbshp)
110{
111
112	*nbshp = bsh + offset;
113	return (0);
114}
115
116void
117generic_bs_barrier(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset,
118    bus_size_t len, int flags)
119{
120
121	/*
122	 * dsb() will drain the L1 write buffer and establish a memory access
123	 * barrier point on platforms where that has meaning.  On a write we
124	 * also need to drain the L2 write buffer, because most on-chip memory
125	 * mapped devices are downstream of the L2 cache.  Note that this needs
126	 * to be done even for memory mapped as Device type, because while
127	 * Device memory is not cached, writes to it are still buffered.
128	 */
129	dsb();
130	if (flags & BUS_SPACE_BARRIER_WRITE) {
131		cpu_l2cache_drain_writebuf();
132	}
133}
134