bus_space_generic.c revision 266084 
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: stable/10/sys/arm/arm/bus_space_generic.c 266084 2014-05-14 19:18:58Z ian $");
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
47#include <vm/vm.h>
48#include <vm/pmap.h>
49#include <vm/vm_kern.h>
50#include <vm/vm_extern.h>
51
52#include <machine/bus.h>
53#include <machine/devmap.h>
54
55/* Prototypes for all the bus_space structure functions */
56bs_protos(generic);
57
58int
59generic_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int flags,
60    bus_space_handle_t *bshp)
61{
62	void *va;
63
64	/*
65	 * We don't even examine the passed-in flags.  For ARM, the CACHEABLE
66	 * flag doesn't make sense (we create PTE_DEVICE mappings), and the
67	 * LINEAR flag is just implied because we use kva_alloc(size).
68	 */
69	if ((va = pmap_mapdev(bpa, size)) == NULL)
70		return (ENOMEM);
71	*bshp = (bus_space_handle_t)va;
72	return (0);
73}
74
75int
76generic_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend, bus_size_t size,
77    bus_size_t alignment, bus_size_t boundary, int flags, bus_addr_t *bpap,
78    bus_space_handle_t *bshp)
79{
80
81	panic("generic_bs_alloc(): not implemented");
82}
83
84
85void
86generic_bs_unmap(void *t, bus_space_handle_t h, bus_size_t size)
87{
88
89	pmap_unmapdev((vm_offset_t)h, size);
90}
91
92void
93generic_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
94{
95
96	panic("generic_bs_free(): not implemented");
97}
98
99int
100generic_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
101    bus_size_t size, bus_space_handle_t *nbshp)
102{
103
104	*nbshp = bsh + offset;
105	return (0);
106}
107
108void
109generic_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset,
110    bus_size_t len, int flags)
111{
112
113	/* Nothing to do. */
114}
115