xref: /freebsd/sys/dev/xdma/xdma_bank.c (revision e8d8bef961a50d4dc22501cde4fb9fb0be1b2532)
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 __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/lock.h>
40 #include <sys/malloc.h>
41 #include <sys/mutex.h>
42 
43 #include <machine/bus.h>
44 
45 #include <dev/xdma/xdma.h>
46 
47 void
48 xchan_bank_init(xdma_channel_t *xchan)
49 {
50 	struct xdma_request *xr;
51 	xdma_controller_t *xdma;
52 	int i;
53 
54 	xdma = xchan->xdma;
55 	KASSERT(xdma != NULL, ("xdma is NULL"));
56 
57 	xchan->xr_mem = malloc(sizeof(struct xdma_request) * xchan->xr_num,
58 	    M_XDMA, M_WAITOK | M_ZERO);
59 
60 	for (i = 0; i < xchan->xr_num; i++) {
61 		xr = &xchan->xr_mem[i];
62 		TAILQ_INSERT_TAIL(&xchan->bank, xr, xr_next);
63 	}
64 }
65 
66 int
67 xchan_bank_free(xdma_channel_t *xchan)
68 {
69 
70 	free(xchan->xr_mem, M_XDMA);
71 
72 	return (0);
73 }
74 
75 struct xdma_request *
76 xchan_bank_get(xdma_channel_t *xchan)
77 {
78 	struct xdma_request *xr;
79 	struct xdma_request *xr_tmp;
80 
81 	QUEUE_BANK_LOCK(xchan);
82 	TAILQ_FOREACH_SAFE(xr, &xchan->bank, xr_next, xr_tmp) {
83 		TAILQ_REMOVE(&xchan->bank, xr, xr_next);
84 		break;
85 	}
86 	QUEUE_BANK_UNLOCK(xchan);
87 
88 	return (xr);
89 }
90 
91 int
92 xchan_bank_put(xdma_channel_t *xchan, struct xdma_request *xr)
93 {
94 
95 	QUEUE_BANK_LOCK(xchan);
96 	TAILQ_INSERT_TAIL(&xchan->bank, xr, xr_next);
97 	QUEUE_BANK_UNLOCK(xchan);
98 
99 	return (0);
100 }
101