1 /***************************************************************************
2 * Copyright (C) 2013 by Franck Jullien *
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. *
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 ***************************************************************************/
23 #include <jtag/jtag.h>
25 #define OR1K_TAP_INST_DEBUG 0x8
27 static int or1k_tap_mohor_init(struct or1k_jtag
*jtag_info
)
29 LOG_DEBUG("Initialising OpenCores JTAG TAP");
31 /* Put TAP into state where it can talk to the debug interface
32 * by shifting in correct value to IR.
35 /* Ensure TAP is reset - maybe not necessary*/
38 struct jtag_tap
*tap
= jtag_info
->tap
;
39 struct scan_field field
;
40 uint8_t ir_value
= OR1K_TAP_INST_DEBUG
;
42 field
.num_bits
= tap
->ir_length
;
43 field
.out_value
= &ir_value
;
44 field
.in_value
= NULL
;
46 jtag_add_ir_scan(tap
, &field
, TAP_IDLE
);
48 return jtag_execute_queue();
51 static struct or1k_tap_ip mohor_tap
= {
53 .init
= or1k_tap_mohor_init
,
56 int or1k_tap_mohor_register(void)
58 list_add_tail(&mohor_tap
.list
, &tap_list
);