1 /* $NetBSD: obio_space.c,v 1.6 2003/07/15 00:25:05 lukem Exp $ */
4 * Copyright (c) 2001, 2002, 2003 Wasabi Systems, Inc.
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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
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.
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include <sys/param.h>
42 #include <sys/systm.h>
44 #include <sys/kernel.h>
45 #include <sys/malloc.h>
49 #include <vm/vm_kern.h>
50 #include <vm/vm_extern.h>
52 #include <machine/bus.h>
53 #include <machine/cpufunc.h>
54 #include <machine/devmap.h>
57 generic_bs_unimplemented(void)
60 panic("unimplemented bus_space function called");
63 /* Prototypes for all the bus_space structure functions */
67 generic_bs_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, int flags,
68 bus_space_handle_t *bshp)
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).
77 if ((va = pmap_mapdev(bpa, size)) == NULL)
79 *bshp = (bus_space_handle_t)va;
84 generic_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)
89 panic("generic_bs_alloc(): not implemented");
94 generic_bs_unmap(bus_space_tag_t t, bus_space_handle_t h, bus_size_t size)
97 pmap_unmapdev((vm_offset_t)h, size);
101 generic_bs_free(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
104 panic("generic_bs_free(): not implemented");
108 generic_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)
112 *nbshp = bsh + offset;
117 generic_bs_barrier(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset,
118 bus_size_t len, int flags)
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.
130 if (flags & BUS_SPACE_BARRIER_WRITE) {
131 cpu_l2cache_drain_writebuf();