bus_space_generic.c revision 177888 
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: head/sys/arm/arm/bus_space_generic.c 177888 2008-04-03 18:28:34Z raj $");
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
54/* Prototypes for all the bus_space structure functions */
55bs_protos(generic);
56
57int
58generic_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int flags,
59    bus_space_handle_t *bshp)
60{
61	const struct pmap_devmap *pd;
62	vm_paddr_t startpa, endpa, pa, offset;
63	vm_offset_t va;
64	pt_entry_t *pte;
65
66	if ((pd = pmap_devmap_find_pa(bpa, size)) != NULL) {
67		/* Device was statically mapped. */
68		*bshp = pd->pd_va + (bpa - pd->pd_pa);
69		return (0);
70	}
71
72	endpa = round_page(bpa + size);
73	offset = bpa & PAGE_MASK;
74	startpa = trunc_page(bpa);
75
76	va = kmem_alloc(kernel_map, endpa - startpa);
77	if (va == 0)
78		return (ENOMEM);
79
80	*bshp = va + offset;
81
82	for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
83		pmap_kenter(va, pa);
84		pte = vtopte(va);
85		if (!(flags & BUS_SPACE_MAP_CACHEABLE)) {
86			*pte &= ~L2_S_CACHE_MASK;
87			PTE_SYNC(pte);
88		}
89	}
90
91	return (0);
92}
93
94int
95generic_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend, bus_size_t size,
96    bus_size_t alignment, bus_size_t boundary, int flags, bus_addr_t *bpap,
97    bus_space_handle_t *bshp)
98{
99
100	panic("generic_bs_alloc(): not implemented");
101}
102
103
104void
105generic_bs_unmap(void *t, bus_space_handle_t h, bus_size_t size)
106{
107	vm_offset_t va, endva;
108
109	if (pmap_devmap_find_va((vm_offset_t)t, size) != NULL) {
110		/* Device was statically mapped; nothing to do. */
111		return;
112	}
113
114	endva = round_page((vm_offset_t)t + size);
115	va = trunc_page((vm_offset_t)t);
116
117	while (va < endva) {
118		pmap_kremove(va);
119		va += PAGE_SIZE;
120	}
121	kmem_free(kernel_map, va, endva - va);
122}
123
124void
125generic_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
126{
127
128	panic("generic_bs_free(): not implemented");
129}
130
131int
132generic_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
133    bus_size_t size, bus_space_handle_t *nbshp)
134{
135
136	*nbshp = bsh + offset;
137	return (0);
138}
139
140void
141generic_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset,
142    bus_size_t len, int flags)
143{
144
145	/* Nothing to do. */
146}
147