1 /***************************************************************************
2 * Copyright (C) 2008 by Øyvind Harboe *
3 * oyvind.harboe@zylin.com *
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. *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program. If not, see <http://www.gnu.org/licenses/>. *
17 ***************************************************************************/
23 #include <jtag/interface.h>
27 /* my private tap controller state, which tracks state for calling code */
28 static tap_state_t dummy_state
= TAP_RESET
;
30 static int dummy_clock
; /* edge detector */
32 static int clock_count
; /* count clocks in any stable state, only stable states */
34 static uint32_t dummy_data
;
36 static bb_value_t
dummy_read(void)
38 int data
= 1 & dummy_data
;
39 dummy_data
= (dummy_data
>> 1) | (1 << 31);
40 return data
? BB_HIGH
: BB_LOW
;
43 static int dummy_write(int tck
, int tms
, int tdi
)
45 /* TAP standard: "state transitions occur on rising edge of clock" */
46 if (tck
!= dummy_clock
) {
48 tap_state_t old_state
= dummy_state
;
49 dummy_state
= tap_state_transition(old_state
, tms
);
51 if (old_state
!= dummy_state
) {
53 LOG_DEBUG("dummy_tap: %d stable clocks", clock_count
);
57 LOG_DEBUG("dummy_tap: %s", tap_state_name(dummy_state
));
60 if (dummy_state
== TAP_DRCAPTURE
)
61 dummy_data
= 0x01255043;
64 /* this is a stable state clock edge, no change of state here,
65 * simply increment clock_count for subsequent logging
75 static int dummy_reset(int trst
, int srst
)
79 if (trst
|| (srst
&& (jtag_get_reset_config() & RESET_SRST_PULLS_TRST
)))
80 dummy_state
= TAP_RESET
;
82 LOG_DEBUG("reset to: %s", tap_state_name(dummy_state
));
86 static int dummy_led(int on
)
91 static struct bitbang_interface dummy_bitbang
= {
93 .write
= &dummy_write
,
94 .reset
= &dummy_reset
,
98 static int dummy_khz(int khz
, int *jtag_speed
)
103 *jtag_speed
= 64000/khz
;
107 static int dummy_speed_div(int speed
, int *khz
)
117 static int dummy_speed(int speed
)
122 static int dummy_init(void)
124 bitbang_interface
= &dummy_bitbang
;
129 static int dummy_quit(void)
134 static const struct command_registration dummy_command_handlers
[] = {
138 .help
= "dummy interface driver commands",
139 .chain
= hello_command_handlers
,
142 COMMAND_REGISTRATION_DONE
,
145 /* The dummy driver is used to easily check the code path
146 * where the target is unresponsive.
148 struct jtag_interface dummy_interface
= {
151 .supported
= DEBUG_CAP_TMS_SEQ
,
152 .commands
= dummy_command_handlers
,
153 .transports
= jtag_only
,
155 .execute_queue
= &bitbang_execute_queue
,
157 .speed
= &dummy_speed
,
159 .speed_div
= &dummy_speed_div
,
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