1 /* $NetBSD: fdt_dma_machdep.c,v 1.2 2023/05/07 12:41:48 skrll Exp $ */
2
3 /*-
4 * Copyright (c) 2022 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Nick Hudson
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: fdt_dma_machdep.c,v 1.2 2023/05/07 12:41:48 skrll Exp $");
34
35 #include <sys/param.h>
36 #include <sys/bus.h>
37 #include <sys/kmem.h>
38
39 #include <dev/fdt/fdtvar.h>
40
41 extern struct riscv_bus_dma_tag riscv_generic_dma_tag;
42
43 bus_dma_tag_t
fdtbus_dma_tag_create(int phandle,const struct fdt_dma_range * ranges,u_int nranges)44 fdtbus_dma_tag_create(int phandle, const struct fdt_dma_range *ranges,
45 u_int nranges)
46 {
47 struct riscv_bus_dma_tag *tagp;
48 u_int n;
49
50 // Check bindings.
51 const int flags = of_hasprop(phandle, "dma-coherent") ?
52 _BUS_DMAMAP_COHERENT : 0;
53
54 tagp = kmem_alloc(sizeof(*tagp), KM_SLEEP);
55 *tagp = riscv_generic_dma_tag;
56 if (nranges == 0) {
57 tagp->_nranges = 1;
58 tagp->_ranges = kmem_alloc(sizeof(*tagp->_ranges), KM_SLEEP);
59 tagp->_ranges[0].dr_sysbase = 0;
60 tagp->_ranges[0].dr_busbase = 0;
61 tagp->_ranges[0].dr_len = UINTPTR_MAX;
62 tagp->_ranges[0].dr_flags = flags;
63 } else {
64 tagp->_nranges = nranges;
65 tagp->_ranges = kmem_alloc(sizeof(*tagp->_ranges) * nranges,
66 KM_SLEEP);
67 for (n = 0; n < nranges; n++) {
68 tagp->_ranges[n].dr_sysbase = ranges[n].dr_sysbase;
69 tagp->_ranges[n].dr_busbase = ranges[n].dr_busbase;
70 tagp->_ranges[n].dr_len = ranges[n].dr_len;
71 tagp->_ranges[n].dr_flags = flags;
72 }
73 }
74
75 return tagp;
76 }
77