mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-19 16:38:53 +09:00
117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
/*
|
|
* (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 */
|
|
}
|