forked from Xilinx/PYNQ
-
Notifications
You must be signed in to change notification settings - Fork 1
/
uio.c
89 lines (85 loc) · 3.52 KB
/
uio.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
/******************************************************************************
* Copyright (c) 2016, Xilinx, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION). HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*****************************************************************************/
/******************************************************************************
*
*
* @file uio.c
*
* Functions to interact with linux UIO. No safe checks here, so users must
* know what they are doing.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver Who Date Changes
* ----- --- ------- -----------------------------------------------
* 1.00a yrq 12/05/17 Initial release
*
* </pre>
*
*****************************************************************************/
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#include "uio.h"
/******************************************************************************
* Function to set the UIO device.
* @param uio_index is the uio index in /dev list.
* @param length is the length of the MMAP in bytes.
* @return A pointer pointing to the MMAP of the UIO.
*****************************************************************************/
void* setUIO(int uio_index, int length){
char uio_buf[32];
int uio_fd;
void *uio_ptr;
sprintf(uio_buf, "/dev/uio%d", uio_index);
uio_fd = open(uio_buf, O_RDWR);
if (uio_fd < 1) {
printf("Invalid UIO device file: %s.\n", uio_buf);
}
// mmap the UIO devices
uio_ptr = mmap(NULL, length,
PROT_READ|PROT_WRITE, MAP_SHARED, uio_fd, 0);
return uio_ptr;
}
/******************************************************************************
* Function to set the UIO device.
* @param uio_ptr is the uio pointer to be freed.
* @param length is the length of the MMAP.
* @return 0 on success; -1 otherwise.
*****************************************************************************/
int unsetUIO(void* uio_ptr, int length){
return munmap(uio_ptr, length);
}