1 /*-
2 * Copyright (c) 2018-2019 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/lock.h>
38 #include <sys/malloc.h>
39 #include <sys/mutex.h>
40
41 #include <machine/bus.h>
42
43 #include <dev/xdma/xdma.h>
44
45 void
xchan_bank_init(xdma_channel_t * xchan)46 xchan_bank_init(xdma_channel_t *xchan)
47 {
48 struct xdma_request *xr;
49 int i;
50
51 KASSERT(xchan->xdma != NULL, ("xdma is NULL"));
52
53 xchan->xr_mem = malloc(sizeof(struct xdma_request) * xchan->xr_num,
54 M_XDMA, M_WAITOK | M_ZERO);
55
56 for (i = 0; i < xchan->xr_num; i++) {
57 xr = &xchan->xr_mem[i];
58 TAILQ_INSERT_TAIL(&xchan->bank, xr, xr_next);
59 }
60 }
61
62 int
xchan_bank_free(xdma_channel_t * xchan)63 xchan_bank_free(xdma_channel_t *xchan)
64 {
65
66 free(xchan->xr_mem, M_XDMA);
67
68 return (0);
69 }
70
71 struct xdma_request *
xchan_bank_get(xdma_channel_t * xchan)72 xchan_bank_get(xdma_channel_t *xchan)
73 {
74 struct xdma_request *xr;
75 struct xdma_request *xr_tmp;
76
77 QUEUE_BANK_LOCK(xchan);
78 TAILQ_FOREACH_SAFE(xr, &xchan->bank, xr_next, xr_tmp) {
79 TAILQ_REMOVE(&xchan->bank, xr, xr_next);
80 break;
81 }
82 QUEUE_BANK_UNLOCK(xchan);
83
84 return (xr);
85 }
86
87 int
xchan_bank_put(xdma_channel_t * xchan,struct xdma_request * xr)88 xchan_bank_put(xdma_channel_t *xchan, struct xdma_request *xr)
89 {
90
91 QUEUE_BANK_LOCK(xchan);
92 TAILQ_INSERT_TAIL(&xchan->bank, xr, xr_next);
93 QUEUE_BANK_UNLOCK(xchan);
94
95 return (0);
96 }
97