fdt_bus_machdep.c revision 1.4 
1/* $NetBSD: fdt_bus_machdep.c,v 1.4 2025/09/06 21:02:41 thorpej Exp $ */
2
3/*-
4 * Copyright (c) 2021 Jared McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: fdt_bus_machdep.c,v 1.4 2025/09/06 21:02:41 thorpej Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34#include <sys/kmem.h>
35
36#include <dev/fdt/fdtvar.h>
37#include <dev/fdt/fdt_platform.h>
38
39#include <arm/fdt/arm_fdtvar.h>
40
41extern struct bus_space arm_generic_bs_tag;
42
43static int
44nonposted_mmio_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int flag,
45    bus_space_handle_t *bshp)
46{
47	if (flag == 0) {
48		flag |= BUS_SPACE_MAP_NONPOSTED;
49	}
50
51	return bus_space_map(&arm_generic_bs_tag, bpa, size, flag, bshp);
52}
53
54bus_space_tag_t
55fdtbus_bus_tag_create(int phandle, uint32_t flags)
56{
57	const struct fdt_platform *plat = fdt_platform_find();
58	struct bus_space *tagp;
59	struct fdt_attach_args faa;
60
61	plat->fp_init_attach_args(&faa);
62
63	tagp = kmem_alloc(sizeof(*tagp), KM_SLEEP);
64	*tagp = *faa.faa_bst;
65	if ((flags & FDT_BUS_SPACE_FLAG_NONPOSTED_MMIO) != 0) {
66		tagp->bs_map = nonposted_mmio_bs_map;
67	}
68
69	return tagp;
70}
71