1 /* $NetBSD: fdt_dma_machdep.c,v 1.1 2020/02/20 01:35:55 jmcneill Exp $ */
2
3 /*-
4 * Copyright (c) 2020 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_dma_machdep.c,v 1.1 2020/02/20 01:35:55 jmcneill 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
38 extern struct arm32_bus_dma_tag arm_generic_dma_tag;
39
40 bus_dma_tag_t
fdtbus_dma_tag_create(int phandle,const struct fdt_dma_range * ranges,u_int nranges)41 fdtbus_dma_tag_create(int phandle, const struct fdt_dma_range *ranges,
42 u_int nranges)
43 {
44 struct arm32_bus_dma_tag *tagp;
45 u_int n;
46
47 const int flags = of_hasprop(phandle, "dma-coherent") ?
48 _BUS_DMAMAP_COHERENT : 0;
49
50 tagp = kmem_alloc(sizeof(*tagp), KM_SLEEP);
51 *tagp = arm_generic_dma_tag;
52 if (nranges == 0) {
53 tagp->_nranges = 1;
54 tagp->_ranges = kmem_alloc(sizeof(*tagp->_ranges), KM_SLEEP);
55 tagp->_ranges[0].dr_sysbase = 0;
56 tagp->_ranges[0].dr_busbase = 0;
57 tagp->_ranges[0].dr_len = UINTPTR_MAX;
58 tagp->_ranges[0].dr_flags = flags;
59 } else {
60 tagp->_nranges = nranges;
61 tagp->_ranges = kmem_alloc(sizeof(*tagp->_ranges) * nranges,
62 KM_SLEEP);
63 for (n = 0; n < nranges; n++) {
64 tagp->_ranges[n].dr_sysbase = ranges[n].dr_sysbase;
65 tagp->_ranges[n].dr_busbase = ranges[n].dr_busbase;
66 tagp->_ranges[n].dr_len = ranges[n].dr_len;
67 tagp->_ranges[n].dr_flags = flags;
68 }
69 }
70
71 return tagp;
72 }
73