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
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
/*
* (C) Copyright 2003
* Stefan Roese, esd gmbh germany, stefan.roese@esd-electronics.com
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
/*******************************************************/
/* file: ports.c */
/* abstract: This file contains the routines to */
/* output values on the JTAG ports, to read */
/* the TDO bit, and to read a byte of data */
/* from the prom */
/* */
/*******************************************************/
#include <common.h>
#include <asm/processor.h>
#include "ports.h"
static unsigned long output = 0;
static int filepos = 0;
static int oldstate = 0;
static int newstate = 0;
static int readptr = 0;
extern long filesize;
extern const unsigned char fpgadata[];
/* if in debugging mode, then just set the variables */
void setPort(short p,short val)
{
if (p==TMS) {
if (val) {
output |= JTAG_TMS;
} else {
output &= ~JTAG_TMS;
}
}
if (p==TDI) {
if (val) {
output |= JTAG_TDI;
} else {
output &= ~JTAG_TDI;
}
}
if (p==TCK) {
if (val) {
output |= JTAG_TCK;
} else {
output &= ~JTAG_TCK;
}
out32(GPIO0_OR, output);
}
}
/* toggle tck LH */
void pulseClock(void)
{
setPort(TCK,0); /* set the TCK port to low */
setPort(TCK,1); /* set the TCK port to high */
}
/* read in a byte of data from the prom */
void readByte(unsigned char *data)
{
/* pretend reading using a file */
*data = fpgadata[readptr++];
newstate = (100 * filepos++) / filesize;
if (newstate != oldstate) {
printf("%4d\r\r\r\r", newstate);
oldstate = newstate;
}
}
/* read the TDO bit from port */
unsigned char readTDOBit(void)
{
unsigned long inputs;
inputs = in32(GPIO0_IR);
if (inputs & JTAG_TDO)
return 1;
else
return 0;
}
/* Wait at least the specified number of microsec. */
/* Use a timer if possible; otherwise estimate the number of instructions */
/* necessary to be run based on the microcontroller speed. For this example */
/* we pulse the TCK port a number of times based on the processor speed. */
void waitTime(long microsec)
{
udelay(microsec); /* esd */
}
|
