/* legacy_dbg_commands.c -- JTAG protocol bridge between GDB and OpenCores debug module.
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/* legacy_dbg_commands.c -- JTAG protocol bridge between GDB and OpenCores debug module.
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Copyright(C) 2001 Marko Mlinar, markom@opencores.org
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Copyright(C) 2001 Marko Mlinar, markom@opencores.org
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Code for TCP/IP copied from gdb, by Chris Ziomkowski
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Code for TCP/IP copied from gdb, by Chris Ziomkowski
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Adapted for the Advanced JTAG Bridge by Nathan Yawn, 2009
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Adapted for the Advanced JTAG Bridge by Nathan Yawn, (C) 2009-2010
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This file was part of the OpenRISC 1000 Architectural Simulator.
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This file was part of the OpenRISC 1000 Architectural Simulator.
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It is now also used to connect GDB to a running hardware OpenCores / OR1200
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It is now also used to connect GDB to a running hardware OpenCores / OR1200
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debug unit.
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debug unit.
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This program is free software; you can redistribute it and/or modify
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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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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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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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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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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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <assert.h>
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#include <assert.h>
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#include <stdio.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <ctype.h>
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#include <string.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include <stdarg.h>
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#include <sys/stat.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/types.h>
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#include <netinet/in.h> // for htonl
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#include <netinet/in.h> // for htonl
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#include "chain_commands.h"
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#include "chain_commands.h"
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#include "cable_common.h"
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#include "cable_common.h"
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#include "errcodes.h"
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#include "errcodes.h"
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#include "legacy_dbg_commands.h"
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#include "legacy_dbg_commands.h"
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#define debug(...) //fprintf(stderr, __VA_ARGS__ )
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#define debug(...) //fprintf(stderr, __VA_ARGS__ )
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#define LEGACY_CRC_POLY 0x04c11db7
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#define LEGACY_CRC_POLY 0x04c11db7
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#define DBG_CRC_SIZE 32
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#define DBG_CRC_SIZE 32
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/* Crc of current read or written data. */
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/* Crc of current read or written data. */
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static int legacy_crc_r, legacy_crc_w = 0;
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static int legacy_crc_r, legacy_crc_w = 0;
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/*----------------------------------------------------------------------------------*/
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/*----------------------------------------------------------------------------------*/
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// Helper Functions
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// Helper Functions
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/* Generates new crc, sending in new bit input_bit */
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/* Generates new crc, sending in new bit input_bit */
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static unsigned long legacy_crc_calc(unsigned long crc, int input_bit) {
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static unsigned long legacy_crc_calc(unsigned long crc, int input_bit) {
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unsigned long d = (input_bit&1) ? 0xfffffff : 0x0000000;
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unsigned long d = (input_bit&1) ? 0xfffffff : 0x0000000;
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unsigned long crc_32 = ((crc >> 31)&1) ? 0xfffffff : 0x0000000;
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unsigned long crc_32 = ((crc >> 31)&1) ? 0xfffffff : 0x0000000;
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crc <<= 1;
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crc <<= 1;
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return crc ^ ((d ^ crc_32) & LEGACY_CRC_POLY);
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return crc ^ ((d ^ crc_32) & LEGACY_CRC_POLY);
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}
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}
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/* Writes bitstream. LS bit first if len < 0, MS bit first if len > 0. */
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/* Writes bitstream. LS bit first if len < 0, MS bit first if len > 0. */
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static void legacy_write_stream(uint32_t stream, int len, int set_last_bit) {
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static void legacy_write_stream(uint32_t stream, int len, int set_last_bit) {
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int i;
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int i;
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uint32_t err;
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uint32_t err;
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uint32_t outdata = 0;
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uint32_t outdata = 0;
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uint32_t datacpy = stream;
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uint32_t datacpy = stream;
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// MSB needs to be transferred first, lower levels do LSB first. Reverse.
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// MSB needs to be transferred first, lower levels do LSB first. Reverse.
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for(i = 0; i < len; i++) {
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for(i = 0; i < len; i++) {
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outdata |= stream & 0x1;
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outdata |= stream & 0x1;
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if(i < (len-1)) {
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if(i < (len-1)) {
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outdata <<= 1;
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outdata <<= 1;
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stream >>= 1;
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stream >>= 1;
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}
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}
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}
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}
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// Call the lower level, in case the driver has a high-speed transfer capability.
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// Call the lower level, in case the driver has a high-speed transfer capability.
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// *** This always transfers LS bit first.
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// *** This always transfers LS bit first.
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err = jtag_write_stream(&outdata, len, set_last_bit);
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err = jtag_write_stream(&outdata, len, set_last_bit);
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debug("legacy_write_stream, stream = 0x%X (0x%X), len = %d, set_last_bit = %d, ret = 0x%X\n", datacpy, outdata, len, set_last_bit, err);
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debug("legacy_write_stream, stream = 0x%X (0x%X), len = %d, set_last_bit = %d, ret = 0x%X\n", datacpy, outdata, len, set_last_bit, err);
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if(err != APP_ERR_NONE) {
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if(err != APP_ERR_NONE) {
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fprintf(stderr, "Error in legacy_write_stream: %s\n", get_err_string(err));
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fprintf(stderr, "Error in legacy_write_stream: %s\n", get_err_string(err));
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}
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}
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// The low level call does not compute
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// The low level call does not compute
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// a CRC. Do so here. Remember, CRC is only calculated using data bits.
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// a CRC. Do so here. Remember, CRC is only calculated using data bits.
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if(len < 0) {
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if(len < 0) {
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fprintf(stderr, "Program error: legacy debug JTAG read with negative length!\n");
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fprintf(stderr, "Program error: legacy debug JTAG read with negative length!\n");
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/*
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/*
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len = -len;
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len = -len;
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for(i = 0; i < len; i++) {
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for(i = 0; i < len; i++) {
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legacy_crc_w = legacy_crc_calc(legacy_crc_w, stream&1);
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legacy_crc_w = legacy_crc_calc(legacy_crc_w, stream&1);
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datacpy >>= 1;
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datacpy >>= 1;
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}
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}
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*/
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*/
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}
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}
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else {
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else {
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for(i = len-1; i >= 0; i--) {
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for(i = len-1; i >= 0; i--) {
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legacy_crc_w = legacy_crc_calc(legacy_crc_w, (datacpy>>i)&1);
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legacy_crc_w = legacy_crc_calc(legacy_crc_w, (datacpy>>i)&1);
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}
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}
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}
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}
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}
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}
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/* Gets bitstream. LS bit first if len < 0, MS bit first if len > 0. */
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/* Gets bitstream. LS bit first if len < 0, MS bit first if len > 0. */
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static uint32_t legacy_read_stream(unsigned long stream, int len, int set_last_bit) {
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static uint32_t legacy_read_stream(unsigned long stream, int len, int set_last_bit) {
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int i;
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int i;
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uint32_t data = 0, datacpy = 0;
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uint32_t data = 0, datacpy = 0;
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uint32_t outdata = stream;
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uint32_t outdata = stream;
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uint32_t indata;
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uint32_t indata;
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uint32_t err;
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uint32_t err;
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// *** WARNING: We assume that the input ("stream") will always be 0.
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// *** WARNING: We assume that the input ("stream") will always be 0.
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// If it's ever not, then we probably need to reverse the bit order (as
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// If it's ever not, then we probably need to reverse the bit order (as
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// is done in legacy_write_stream) before sending.
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// is done in legacy_write_stream) before sending.
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// Call the lower level, in case the driver has a high-speed transfer capability.
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// Call the lower level, in case the driver has a high-speed transfer capability.
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// This always transfers LS bit first.
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// This always transfers LS bit first.
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err = jtag_read_write_stream(&outdata, &indata, len, 0, set_last_bit);
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err = jtag_read_write_stream(&outdata, &indata, len, 0, set_last_bit);
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// Data comes from the legacy debug unit MSB first, so we need to
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// Data comes from the legacy debug unit MSB first, so we need to
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// reverse the bit order.
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// reverse the bit order.
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for(i = 0; i < len; i++) {
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for(i = 0; i < len; i++) {
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data |= indata & 0x1;
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data |= indata & 0x1;
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if(i < (len-1)) {
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if(i < (len-1)) {
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data <<= 1;
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data <<= 1;
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indata >>= 1;
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indata >>= 1;
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}
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}
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}
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}
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datacpy = data;
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datacpy = data;
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debug("legacy_read_stream: write 0x%X, read 0x%X, len %i, set_last_bit = %d\n", outdata, data, len, set_last_bit);
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debug("legacy_read_stream: write 0x%X, read 0x%X, len %i, set_last_bit = %d\n", outdata, data, len, set_last_bit);
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if(err != APP_ERR_NONE) {
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if(err != APP_ERR_NONE) {
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fprintf(stderr, "Error in legacy_read_stream: %s\n", get_err_string(err));
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fprintf(stderr, "Error in legacy_read_stream: %s\n", get_err_string(err));
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}
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}
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// The low level call does not compute
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// The low level call does not compute
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// a CRC. Do so here. Remember, CRC is only calculated using data bits.
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// a CRC. Do so here. Remember, CRC is only calculated using data bits.
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if(len < 0) {
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if(len < 0) {
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fprintf(stderr, "Program error: legacy debug JTAG read with negative length!\n");
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fprintf(stderr, "Program error: legacy debug JTAG read with negative length!\n");
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/*
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/*
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len = -len;
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len = -len;
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for(i = 0; i < len; i++) {
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for(i = 0; i < len; i++) {
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legacy_crc_w = legacy_crc_calc(legacy_crc_w, stream&1);
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legacy_crc_w = legacy_crc_calc(legacy_crc_w, stream&1);
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stream >>= 1;
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stream >>= 1;
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legacy_crc_r = legacy_crc_calc(legacy_crc_r, datacpy&1);
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legacy_crc_r = legacy_crc_calc(legacy_crc_r, datacpy&1);
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datacpy >>= 1;
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datacpy >>= 1;
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}
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}
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*/
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*/
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}
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}
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else {
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else {
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for(i = len-1; i >= 0; i--) {
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for(i = len-1; i >= 0; i--) {
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legacy_crc_w = legacy_crc_calc(legacy_crc_w, (stream>>i)&1);
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legacy_crc_w = legacy_crc_calc(legacy_crc_w, (stream>>i)&1);
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legacy_crc_r = legacy_crc_calc(legacy_crc_r, (datacpy>>i)&1);
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legacy_crc_r = legacy_crc_calc(legacy_crc_r, (datacpy>>i)&1);
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}
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}
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}
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}
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return data;
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return data;
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}
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}
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//////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////
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// Actual operations on the legacy debug unit
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// Actual operations on the legacy debug unit
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/* Sets scan chain. */
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/* Sets scan chain. */
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int legacy_dbg_set_chain(int chain) {
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int legacy_dbg_set_chain(int chain) {
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int status, crc_generated, legacy_crc_read;
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int status, crc_generated, legacy_crc_read;
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desired_chain = chain;
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desired_chain = chain;
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try_again:
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try_again:
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if (current_chain == chain) return APP_ERR_NONE;
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if (current_chain == chain) return APP_ERR_NONE;
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current_chain = -1;
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current_chain = -1;
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debug("\nset_chain %i\n", chain);
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debug("\nset_chain %i\n", chain);
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tap_set_shift_dr(); /* SHIFT_DR */
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tap_set_shift_dr(); /* SHIFT_DR */
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/* write data, EXIT1_DR */
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/* write data, EXIT1_DR */
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legacy_crc_w = 0xffffffff;
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legacy_crc_w = 0xffffffff;
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legacy_write_stream(((chain & 0xf) | (1<<DC_SIZE)), DC_SIZE + 1, 0);
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legacy_write_stream(((chain & 0xf) | (1<<DC_SIZE)), DC_SIZE + 1, 0);
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legacy_write_stream(legacy_crc_w, DBG_CRC_SIZE, 0);
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legacy_write_stream(legacy_crc_w, DBG_CRC_SIZE, 0);
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legacy_crc_r = 0xffffffff;
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legacy_crc_r = 0xffffffff;
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status = legacy_read_stream(0, DC_STATUS_SIZE, 0);
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status = legacy_read_stream(0, DC_STATUS_SIZE, 0);
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crc_generated = legacy_crc_r;
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crc_generated = legacy_crc_r;
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legacy_crc_read = legacy_read_stream(0, DBG_CRC_SIZE, 1);
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legacy_crc_read = legacy_read_stream(0, DBG_CRC_SIZE, 1);
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debug("Status/CRC read / CRC generated: %x %x %x\n", status, legacy_crc_read, crc_generated);
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debug("Status/CRC read / CRC generated: %x %x %x\n", status, legacy_crc_read, crc_generated);
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/* CRCs must match, otherwise retry */
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/* CRCs must match, otherwise retry */
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if (legacy_crc_read != crc_generated) {
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if (legacy_crc_read != crc_generated) {
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if (retry_do()) goto try_again;
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if (retry_do()) goto try_again;
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else return APP_ERR_CRC;
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else return APP_ERR_CRC;
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}
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}
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/* we should read expected status value, otherwise retry */
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/* we should read expected status value, otherwise retry */
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if (status != 0) {
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if (status != 0) {
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if (retry_do()) goto try_again;
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if (retry_do()) goto try_again;
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else return APP_ERR_BAD_PARAM;
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else return APP_ERR_BAD_PARAM;
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}
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}
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/* reset retry counter */
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/* reset retry counter */
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retry_ok();
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retry_ok();
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tap_exit_to_idle(); // Transition the TAP back to state IDLE
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tap_exit_to_idle(); // Transition the TAP back to state IDLE
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current_chain = chain;
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current_chain = chain;
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debug("Successfully set chain to %i\n", current_chain);
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debug("Successfully set chain to %i\n", current_chain);
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return APP_ERR_NONE;
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return APP_ERR_NONE;
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}
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}
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/* sends out a command with 32bit address and 16bit length, if len >= 0 */
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/* sends out a command with 32bit address and 16bit length, if len >= 0 */
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int legacy_dbg_command(int type, unsigned long adr, int len) {
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int legacy_dbg_command(int type, unsigned long adr, int len) {
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int status, crc_generated, legacy_crc_read;
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int status, crc_generated, legacy_crc_read;
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try_again:
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try_again:
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legacy_dbg_set_chain(desired_chain);
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legacy_dbg_set_chain(desired_chain);
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debug("\ncomm %i\n", type);
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debug("\ncomm %i\n", type);
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/***** WRITEx *****/
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/***** WRITEx *****/
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tap_set_shift_dr(); /* SHIFT_DR */
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tap_set_shift_dr(); /* SHIFT_DR */
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/* write data, EXIT1_DR */
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/* write data, EXIT1_DR */
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legacy_crc_w = 0xffffffff;
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legacy_crc_w = 0xffffffff;
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legacy_write_stream(((DI_WRITE_CMD & 0xf) | (0<<DC_SIZE)), DC_SIZE + 1, 0);
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legacy_write_stream(((DI_WRITE_CMD & 0xf) | (0<<DC_SIZE)), DC_SIZE + 1, 0);
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legacy_write_stream(type, 4, 0);
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legacy_write_stream(type, 4, 0);
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legacy_write_stream(adr, 32, 0);
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legacy_write_stream(adr, 32, 0);
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assert(len > 0);
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assert(len > 0);
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legacy_write_stream(len - 1, 16, 0);
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legacy_write_stream(len - 1, 16, 0);
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legacy_write_stream(legacy_crc_w, DBG_CRC_SIZE, 0);
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legacy_write_stream(legacy_crc_w, DBG_CRC_SIZE, 0);
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legacy_crc_r = 0xffffffff;
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legacy_crc_r = 0xffffffff;
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status = legacy_read_stream(0, DC_STATUS_SIZE, 0);
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status = legacy_read_stream(0, DC_STATUS_SIZE, 0);
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crc_generated = legacy_crc_r;
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crc_generated = legacy_crc_r;
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legacy_crc_read = legacy_read_stream(0, DBG_CRC_SIZE, 1);
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legacy_crc_read = legacy_read_stream(0, DBG_CRC_SIZE, 1);
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|
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/* CRCs must match, otherwise retry */
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/* CRCs must match, otherwise retry */
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if (legacy_crc_read != crc_generated) {
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if (legacy_crc_read != crc_generated) {
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if (retry_do()) goto try_again;
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if (retry_do()) goto try_again;
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else return APP_ERR_CRC;
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else return APP_ERR_CRC;
|
}
|
}
|
/* we should read expected status value, otherwise retry */
|
/* we should read expected status value, otherwise retry */
|
if (status != 0) {
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if (status != 0) {
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if (retry_do()) goto try_again;
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if (retry_do()) goto try_again;
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else return APP_ERR_BAD_PARAM;
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else return APP_ERR_BAD_PARAM;
|
}
|
}
|
|
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tap_exit_to_idle(); // Transition the TAP back to state IDLE
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tap_exit_to_idle(); // Transition the TAP back to state IDLE
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|
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/* reset retry counter */
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/* reset retry counter */
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retry_ok();
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retry_ok();
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return APP_ERR_NONE;
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return APP_ERR_NONE;
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}
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}
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|
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/* writes a ctrl reg */
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/* writes a ctrl reg */
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int legacy_dbg_ctrl(int reset, int stall) {
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int legacy_dbg_ctrl(int reset, int stall) {
|
int status, crc_generated, legacy_crc_read;
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int status, crc_generated, legacy_crc_read;
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|
|
try_again:
|
try_again:
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legacy_dbg_set_chain(desired_chain);
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legacy_dbg_set_chain(desired_chain);
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debug("\nctrl\n");
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debug("\nctrl\n");
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|
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/***** WRITEx *****/
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/***** WRITEx *****/
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tap_set_shift_dr(); /* SHIFT_DR */
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tap_set_shift_dr(); /* SHIFT_DR */
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|
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/* write data, EXIT1_DR */
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/* write data, EXIT1_DR */
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legacy_crc_w = 0xffffffff;
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legacy_crc_w = 0xffffffff;
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legacy_write_stream(((DI_WRITE_CTRL & 0xf) | (0<<DC_SIZE)), DC_SIZE + 1, 0);
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legacy_write_stream(((DI_WRITE_CTRL & 0xf) | (0<<DC_SIZE)), DC_SIZE + 1, 0);
|
legacy_write_stream(reset, 1, 0);
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legacy_write_stream(reset, 1, 0);
|
legacy_write_stream(stall, 1, 0);
|
legacy_write_stream(stall, 1, 0);
|
legacy_write_stream(0, 32, 0); // legacy_write_stream() has a max size of 32 bits, we need 50
|
legacy_write_stream(0, 32, 0); // legacy_write_stream() has a max size of 32 bits, we need 50
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legacy_write_stream(0, 18, 0);
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legacy_write_stream(0, 18, 0);
|
legacy_write_stream(legacy_crc_w, DBG_CRC_SIZE, 0);
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legacy_write_stream(legacy_crc_w, DBG_CRC_SIZE, 0);
|
|
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legacy_crc_r = 0xffffffff;
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legacy_crc_r = 0xffffffff;
|
status = legacy_read_stream(0, DC_STATUS_SIZE, 0);
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status = legacy_read_stream(0, DC_STATUS_SIZE, 0);
|
crc_generated = legacy_crc_r;
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crc_generated = legacy_crc_r;
|
legacy_crc_read = legacy_read_stream(0, DBG_CRC_SIZE, 1);
|
legacy_crc_read = legacy_read_stream(0, DBG_CRC_SIZE, 1);
|
|
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/* CRCs must match, otherwise retry */
|
/* CRCs must match, otherwise retry */
|
debug("did ctrl: %x %x %x\n", status, legacy_crc_read, crc_generated);
|
debug("did ctrl: %x %x %x\n", status, legacy_crc_read, crc_generated);
|
if (legacy_crc_read != crc_generated) {
|
if (legacy_crc_read != crc_generated) {
|
if (retry_do()) goto try_again;
|
if (retry_do()) goto try_again;
|
else return APP_ERR_CRC;
|
else return APP_ERR_CRC;
|
}
|
}
|
/* we should read expected status value, otherwise retry */
|
/* we should read expected status value, otherwise retry */
|
if (status != 0) {
|
if (status != 0) {
|
if (retry_do()) goto try_again;
|
if (retry_do()) goto try_again;
|
else return APP_ERR_BAD_PARAM;
|
else return APP_ERR_BAD_PARAM;
|
}
|
}
|
|
|
tap_exit_to_idle(); // Transition the TAP back to state IDLE
|
tap_exit_to_idle(); // Transition the TAP back to state IDLE
|
|
|
/* reset retry counter */
|
/* reset retry counter */
|
retry_ok();
|
retry_ok();
|
return APP_ERR_NONE;
|
return APP_ERR_NONE;
|
}
|
}
|
|
|
|
|
/* reads control register */
|
/* reads control register */
|
int legacy_dbg_ctrl_read(int *reset, int *stall) {
|
int legacy_dbg_ctrl_read(int *reset, int *stall) {
|
int status, crc_generated, legacy_crc_read;
|
int status, crc_generated, legacy_crc_read;
|
|
|
try_again:
|
try_again:
|
legacy_dbg_set_chain(desired_chain);
|
legacy_dbg_set_chain(desired_chain);
|
debug("\nctrl_read\n");
|
debug("\nctrl_read\n");
|
|
|
tap_set_shift_dr(); /* SHIFT_DR */
|
tap_set_shift_dr(); /* SHIFT_DR */
|
|
|
/* write data, EXIT1_DR */
|
/* write data, EXIT1_DR */
|
legacy_crc_w = 0xffffffff;
|
legacy_crc_w = 0xffffffff;
|
legacy_write_stream(DI_READ_CTRL | (0<<DC_SIZE), DC_SIZE + 1, 0);
|
legacy_write_stream(DI_READ_CTRL | (0<<DC_SIZE), DC_SIZE + 1, 0);
|
legacy_write_stream(legacy_crc_w, DBG_CRC_SIZE, 0);
|
legacy_write_stream(legacy_crc_w, DBG_CRC_SIZE, 0);
|
|
|
legacy_crc_r = 0xffffffff;
|
legacy_crc_r = 0xffffffff;
|
*reset = legacy_read_stream(0, 1, 0);
|
*reset = legacy_read_stream(0, 1, 0);
|
*stall = legacy_read_stream(0, 1, 0);
|
*stall = legacy_read_stream(0, 1, 0);
|
legacy_read_stream(0, 32, 0); // legacy_read_stream() has a max size of 32 bits, we need 50
|
legacy_read_stream(0, 32, 0); // legacy_read_stream() has a max size of 32 bits, we need 50
|
legacy_read_stream(0, 18, 0);
|
legacy_read_stream(0, 18, 0);
|
status = legacy_read_stream(0, DC_STATUS_SIZE, 0);
|
status = legacy_read_stream(0, DC_STATUS_SIZE, 0);
|
crc_generated = legacy_crc_r;
|
crc_generated = legacy_crc_r;
|
legacy_crc_read = legacy_read_stream(0, DBG_CRC_SIZE, 1);
|
legacy_crc_read = legacy_read_stream(0, DBG_CRC_SIZE, 1);
|
|
|
/* CRCs must match, otherwise retry */
|
/* CRCs must match, otherwise retry */
|
debug("read ctrl: %x %x %x. reset = %i, stall = %i\n", status, legacy_crc_read, crc_generated, *reset, *stall);
|
debug("read ctrl: %x %x %x. reset = %i, stall = %i\n", status, legacy_crc_read, crc_generated, *reset, *stall);
|
if (legacy_crc_read != crc_generated) {
|
if (legacy_crc_read != crc_generated) {
|
if (retry_do()) goto try_again;
|
if (retry_do()) goto try_again;
|
else return APP_ERR_CRC;
|
else return APP_ERR_CRC;
|
}
|
}
|
/* we should read expected status value, otherwise retry */
|
/* we should read expected status value, otherwise retry */
|
if (status != 0) {
|
if (status != 0) {
|
if (retry_do()) goto try_again;
|
if (retry_do()) goto try_again;
|
else return APP_ERR_BAD_PARAM;
|
else return APP_ERR_BAD_PARAM;
|
}
|
}
|
|
|
tap_exit_to_idle(); // Transition the TAP back to state IDLE
|
tap_exit_to_idle(); // Transition the TAP back to state IDLE
|
|
|
/* reset retry counter */
|
/* reset retry counter */
|
retry_ok();
|
retry_ok();
|
return APP_ERR_NONE;
|
return APP_ERR_NONE;
|
}
|
}
|
/* issues a burst read/write */
|
/* issues a burst read/write */
|
int legacy_dbg_go(unsigned char *data, unsigned short len, int read) {
|
int legacy_dbg_go(unsigned char *data, unsigned short len, int read) {
|
int status, crc_generated, legacy_crc_read;
|
int status, crc_generated, legacy_crc_read;
|
int i;
|
int i;
|
|
|
//try_again:
|
//try_again:
|
// No point in re-trying without sending the command again first...
|
// No point in re-trying without sending the command again first...
|
|
|
legacy_dbg_set_chain(desired_chain);
|
legacy_dbg_set_chain(desired_chain);
|
debug("\ngo len = %d\n", len);
|
debug("\ngo len = %d\n", len);
|
|
|
tap_set_shift_dr(); /* SHIFT_DR */
|
tap_set_shift_dr(); /* SHIFT_DR */
|
|
|
/* write data, EXIT1_DR */
|
/* write data, EXIT1_DR */
|
legacy_crc_w = 0xffffffff;
|
legacy_crc_w = 0xffffffff;
|
legacy_write_stream(DI_GO | (0<<DC_SIZE), DC_SIZE + 1, 0);
|
legacy_write_stream(DI_GO | (0<<DC_SIZE), DC_SIZE + 1, 0);
|
if (!read) {
|
if (!read) {
|
/* reverse byte ordering, since we must send in big endian */
|
/* reverse byte ordering, since we must send in big endian */
|
for (i = 0; i < len; i++)
|
for (i = 0; i < len; i++)
|
legacy_write_stream(data[i], 8, 0);
|
legacy_write_stream(data[i], 8, 0);
|
}
|
}
|
legacy_write_stream(legacy_crc_w, DBG_CRC_SIZE, 0);
|
legacy_write_stream(legacy_crc_w, DBG_CRC_SIZE, 0);
|
|
|
legacy_crc_r = 0xffffffff;
|
legacy_crc_r = 0xffffffff;
|
|
|
if (read) {
|
if (read) {
|
/* reverse byte ordering, since we must send in big endian */
|
/* reverse byte ordering, since we must send in big endian */
|
for (i = 0; i < len; i++)
|
for (i = 0; i < len; i++)
|
data[i] = legacy_read_stream(0, 8, 0);
|
data[i] = legacy_read_stream(0, 8, 0);
|
}
|
}
|
status = legacy_read_stream(0, DC_STATUS_SIZE, 0);
|
status = legacy_read_stream(0, DC_STATUS_SIZE, 0);
|
crc_generated = legacy_crc_r;
|
crc_generated = legacy_crc_r;
|
legacy_crc_read = legacy_read_stream(0, DBG_CRC_SIZE, 1);
|
legacy_crc_read = legacy_read_stream(0, DBG_CRC_SIZE, 1);
|
|
|
/* CRCs must match, otherwise retry */
|
/* CRCs must match, otherwise retry */
|
debug("%x %x %x\n", status, legacy_crc_read, crc_generated);
|
debug("%x %x %x\n", status, legacy_crc_read, crc_generated);
|
if (legacy_crc_read != crc_generated) {
|
if (legacy_crc_read != crc_generated) {
|
//if (retry_do()) goto try_again;
|
//if (retry_do()) goto try_again;
|
//else
|
//else
|
return APP_ERR_CRC;
|
return APP_ERR_CRC;
|
}
|
}
|
/* we should read expected status value, otherwise retry */
|
/* we should read expected status value, otherwise retry */
|
if (status != 0) {
|
if (status != 0) {
|
//if (retry_do()) goto try_again;
|
//if (retry_do()) goto try_again;
|
//else
|
//else
|
return status;
|
return status;
|
}
|
}
|
|
|
tap_exit_to_idle(); // Transition the TAP back to state IDLE
|
tap_exit_to_idle(); // Transition the TAP back to state IDLE
|
|
|
/* reset retry counter */
|
/* reset retry counter */
|
retry_ok();
|
retry_ok();
|
return APP_ERR_NONE;
|
return APP_ERR_NONE;
|
}
|
}
|
|
|
|
|
