2 * Copyright (c) 2017-2018 Ruslan Bukin <br@bsdpad.com>
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.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include "opt_platform.h"
35 #include <sys/param.h>
38 #include <sys/kernel.h>
39 #include <sys/malloc.h>
41 #include <machine/bus.h>
43 #include <dev/xdma/xdma.h>
46 xchan_sglist_alloc(xdma_channel_t *xchan)
50 if (xchan->flags & XCHAN_SGLIST_ALLOCATED)
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;
61 xchan_sglist_free(xdma_channel_t *xchan)
64 if (xchan->flags & XCHAN_SGLIST_ALLOCATED)
65 free(xchan->sg, M_XDMA);
67 xchan->flags &= ~XCHAN_SGLIST_ALLOCATED;
71 xdma_sglist_add(struct xdma_sglist *sg, struct bus_dma_segment *seg,
72 uint32_t nsegs, struct xdma_request *xr)
79 for (i = 0; i < nsegs; i++) {
80 sg[i].src_width = xr->src_width;
81 sg[i].dst_width = xr->dst_width;
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;
87 sg[i].src_addr = xr->src_addr;
88 sg[i].dst_addr = seg[i].ds_addr;
90 sg[i].len = seg[i].ds_len;
91 sg[i].direction = xr->direction;
98 sg[nsegs - 1].last = 1;