1 /*-
2 * Copyright (c) 2017-2018 Ruslan Bukin <br@bsdpad.com>
3 * All rights reserved.
4 *
5 * This software was developed by SRI International and the University of
6 * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
7 * ("CTSRD"), as part of the DARPA CRASH research programme.
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 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 #include "opt_platform.h"
33 #include <sys/param.h>
34 #include <sys/conf.h>
35 #include <sys/bus.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38
39 #include <machine/bus.h>
40
41 #include <dev/xdma/xdma.h>
42
43 int
xchan_sglist_alloc(xdma_channel_t * xchan)44 xchan_sglist_alloc(xdma_channel_t *xchan)
45 {
46 uint32_t sz;
47
48 if (xchan->flags & XCHAN_SGLIST_ALLOCATED)
49 return (-1);
50
51 sz = (sizeof(struct xdma_sglist) * XDMA_SGLIST_MAXLEN);
52 xchan->sg = malloc(sz, M_XDMA, M_WAITOK | M_ZERO);
53 xchan->flags |= XCHAN_SGLIST_ALLOCATED;
54
55 return (0);
56 }
57
58 void
xchan_sglist_free(xdma_channel_t * xchan)59 xchan_sglist_free(xdma_channel_t *xchan)
60 {
61
62 if (xchan->flags & XCHAN_SGLIST_ALLOCATED)
63 free(xchan->sg, M_XDMA);
64
65 xchan->flags &= ~XCHAN_SGLIST_ALLOCATED;
66 }
67
68 int
xdma_sglist_add(struct xdma_sglist * sg,struct bus_dma_segment * seg,uint32_t nsegs,struct xdma_request * xr)69 xdma_sglist_add(struct xdma_sglist *sg, struct bus_dma_segment *seg,
70 uint32_t nsegs, struct xdma_request *xr)
71 {
72 int i;
73
74 if (nsegs == 0)
75 return (-1);
76
77 for (i = 0; i < nsegs; i++) {
78 sg[i].src_width = xr->src_width;
79 sg[i].dst_width = xr->dst_width;
80
81 if (xr->direction == XDMA_MEM_TO_DEV) {
82 sg[i].src_addr = seg[i].ds_addr;
83 sg[i].dst_addr = xr->dst_addr;
84 } else {
85 sg[i].src_addr = xr->src_addr;
86 sg[i].dst_addr = seg[i].ds_addr;
87 }
88 sg[i].len = seg[i].ds_len;
89 sg[i].direction = xr->direction;
90
91 sg[i].first = 0;
92 sg[i].last = 0;
93 }
94
95 sg[0].first = 1;
96 sg[nsegs - 1].last = 1;
97
98 return (0);
99 }
100