1/*-
2 * Copyright (c) 2017-2019 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
47int
48xdma_dequeue_bio(xdma_channel_t *xchan, struct bio **bp,
49    xdma_transfer_status_t *status)
50{
51	struct xdma_request *xr_tmp;
52	struct xdma_request *xr;
53
54	QUEUE_OUT_LOCK(xchan);
55	TAILQ_FOREACH_SAFE(xr, &xchan->queue_out, xr_next, xr_tmp) {
56		TAILQ_REMOVE(&xchan->queue_out, xr, xr_next);
57		break;
58	}
59	QUEUE_OUT_UNLOCK(xchan);
60
61	if (xr == NULL)
62		return (-1);
63
64	*bp = xr->bp;
65
66	status->error = xr->status.error;
67	status->transferred = xr->status.transferred;
68
69	xchan_bank_put(xchan, xr);
70
71	return (0);
72}
73
74int
75xdma_enqueue_bio(xdma_channel_t *xchan, struct bio **bp,
76    bus_addr_t addr, uint8_t src_width, uint8_t dst_width,
77    enum xdma_direction dir)
78{
79	struct xdma_request *xr;
80	xdma_controller_t *xdma;
81
82	xdma = xchan->xdma;
83
84	xr = xchan_bank_get(xchan);
85	if (xr == NULL)
86		return (-1); /* No space is available yet. */
87
88	xr->direction = dir;
89	xr->bp = *bp;
90	xr->req_type = XR_TYPE_BIO;
91	xr->src_width = src_width;
92	xr->dst_width = dst_width;
93	if (dir == XDMA_MEM_TO_DEV) {
94		xr->dst_addr = addr;
95		xr->src_addr = 0;
96	} else {
97		xr->dst_addr = 0;
98		xr->src_addr = addr;
99	}
100
101	QUEUE_IN_LOCK(xchan);
102	TAILQ_INSERT_TAIL(&xchan->queue_in, xr, xr_next);
103	QUEUE_IN_UNLOCK(xchan);
104
105	return (0);
106}
107