43f27568ddc40277e465129737cb525a2ac8ec48
[openocd.git] / src / target / openrisc / or1k_tap_xilinx_bscan.c
1 /***************************************************************************
2 * Copyright (C) 2013 by Sergio Chico *
3 * sergio.chico@gmail.com *
4 * *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
9 * *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
14 * *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program; if not, write to the *
17 * Free Software Foundation, Inc., *
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
19 ***************************************************************************/
20
21 #ifdef HAVE_CONFIG_H
22 #include "config.h"
23 #endif
24
25 #include "or1k_tap.h"
26 #include "or1k.h"
27
28 #include <jtag/jtag.h>
29
30 #define OR1K_XILINX_TAP_INST_USER1 0x02
31
32 static int or1k_tap_xilinx_bscan_init(struct or1k_jtag *jtag_info)
33 {
34 LOG_DEBUG("Initialising Xilinx Internal JTAG TAP");
35
36 /* Put TAP into state where it can talk to the debug interface
37 * by shifting in correct value to IR.
38 */
39
40 /* Ensure TAP is reset - maybe not necessary*/
41 jtag_add_tlr();
42
43 struct jtag_tap *tap = jtag_info->tap;
44 struct scan_field field;
45 uint8_t ir_value = OR1K_XILINX_TAP_INST_USER1;
46
47 field.num_bits = tap->ir_length;
48 field.out_value = &ir_value;
49 field.in_value = NULL;
50
51 jtag_add_ir_scan(tap, &field, TAP_IDLE);
52
53 return jtag_execute_queue();
54 }
55
56 static struct or1k_tap_ip xilinx_bscan_tap = {
57 .name = "xilinx_bscan",
58 .init = or1k_tap_xilinx_bscan_init,
59 };
60
61 int or1k_tap_xilinx_bscan_register(void)
62 {
63 list_add_tail(&xilinx_bscan_tap.list, &tap_list);
64 return 0;
65 }