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topic: Support for the Xilinx BSCAN_* Virtual JTAG in Openrisc

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This add support to the Xilinx BSCAN_* virtual JTAG interface.
This is the Xilinx equivalent of the Altera sld_virtual_jtag interface,
it allows a user to connect to the debug unit through the main
FPGA JTAG connection.

Change-Id: Ia438e910650cff9cbc8f810b719fc1d5de5a8188
Signed-off-by: Sergio Chico <sergio.chico@gmail.com>
Reviewed-on: http://openocd.zylin.com/1806
Tested-by: jenkins
Reviewed-by: Franck Jullien <franck.jullien@gmail.com>
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
This commit is contained in:
Sergio Chico
2013-11-10 16:03:40 +01:00
committed by Andreas Fritiofson
parent 2d64cf92ae
commit 93a3a82e49
7 changed files with 95 additions and 6 deletions
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65
src/target/openrisc/or1k_tap_xilinx_bscan.c Normal file
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/***************************************************************************
* Copyright (C) 2013 by Sergio Chico *
* sergio.chico@gmail.com *
* *
* 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. *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "or1k_tap.h"
#include "or1k.h"
#include <jtag/jtag.h>
#define OR1K_XILINX_TAP_INST_USER1 0x02
static int or1k_tap_xilinx_bscan_init(struct or1k_jtag *jtag_info)
{
LOG_DEBUG("Initialising Xilinx Internal JTAG TAP");
/* Put TAP into state where it can talk to the debug interface
* by shifting in correct value to IR.
*/
/* Ensure TAP is reset - maybe not necessary*/
jtag_add_tlr();
struct jtag_tap *tap = jtag_info->tap;
struct scan_field field;
uint8_t ir_value = OR1K_XILINX_TAP_INST_USER1;
field.num_bits = tap->ir_length;
field.out_value = &ir_value;
field.in_value = NULL;
jtag_add_ir_scan(tap, &field, TAP_IDLE);
return jtag_execute_queue();
}
static struct or1k_tap_ip xilinx_bscan_tap = {
.name = "xilinx_bscan",
.init = or1k_tap_xilinx_bscan_init,
};
int or1k_tap_xilinx_bscan_register(void)
{
list_add_tail(&xilinx_bscan_tap.list, &tap_list);
return 0;
}