| /* |
| * (C) Copyright 2003 |
| * Stefan Roese, esd gmbh germany, stefan.roese@esd-electronics.com |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| /*******************************************************/ |
| /* 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 <asm/io.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 const unsigned char *xsvfdata; |
| |
| /* 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; |
| } |
| out_be32((void *)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 = xsvfdata[readptr++]; |
| newstate = filepos++ >> 10; |
| if (newstate != oldstate) { |
| printf("%4d kB\r\r\r\r", newstate); |
| oldstate = newstate; |
| } |
| } |
| |
| /* read the TDO bit from port */ |
| unsigned char readTDOBit(void) |
| { |
| unsigned long inputs; |
| |
| inputs = in_be32((void *)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 */ |
| } |