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