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__FBSDID("$FreeBSD$");
33
34#include "opt_platform.h"
35#include <sys/param.h>
36#include <sys/conf.h>
37#include <sys/bus.h>
38#include <sys/kernel.h>
39#include <sys/malloc.h>
40
41#include <machine/bus.h>
42
43#include <dev/xdma/xdma.h>
44
45int
46xchan_sglist_alloc(xdma_channel_t *xchan)
47{
48	uint32_t sz;
49
50	if (xchan->flags & XCHAN_SGLIST_ALLOCATED)
51		return (-1);
52
53	sz = (sizeof(struct xdma_sglist) * XDMA_SGLIST_MAXLEN);
54	xchan->sg = malloc(sz, M_XDMA, M_WAITOK | M_ZERO);
55	xchan->flags |= XCHAN_SGLIST_ALLOCATED;
56
57	return (0);
58}
59
60void
61xchan_sglist_free(xdma_channel_t *xchan)
62{
63
64	if (xchan->flags & XCHAN_SGLIST_ALLOCATED)
65		free(xchan->sg, M_XDMA);
66
67	xchan->flags &= ~XCHAN_SGLIST_ALLOCATED;
68}
69
70int
71xdma_sglist_add(struct xdma_sglist *sg, struct bus_dma_segment *seg,
72    uint32_t nsegs, struct xdma_request *xr)
73{
74	int i;
75
76	if (nsegs == 0)
77		return (-1);
78
79	for (i = 0; i < nsegs; i++) {
80		sg[i].src_width = xr->src_width;
81		sg[i].dst_width = xr->dst_width;
82
83		if (xr->direction == XDMA_MEM_TO_DEV) {
84			sg[i].src_addr = seg[i].ds_addr;
85			sg[i].dst_addr = xr->dst_addr;
86		} else {
87			sg[i].src_addr = xr->src_addr;
88			sg[i].dst_addr = seg[i].ds_addr;
89		}
90		sg[i].len = seg[i].ds_len;
91		sg[i].direction = xr->direction;
92
93		sg[i].first = 0;
94		sg[i].last = 0;
95	}
96
97	sg[0].first = 1;
98	sg[nsegs - 1].last = 1;
99
100	return (0);
101}
102