db1ba13a49f0870805a9afe467a693b6b31d5c32
[openocd.git] / src / jtag / drivers / dummy.c
1 /***************************************************************************
2 * Copyright (C) 2008 by √ėyvind Harboe *
3 * oyvind.harboe@zylin.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, see <http://www.gnu.org/licenses/>. *
17 ***************************************************************************/
18
19 #ifdef HAVE_CONFIG_H
20 #include "config.h"
21 #endif
22
23 #include <jtag/interface.h>
24 #include "bitbang.h"
25 #include "hello.h"
26
27 /* my private tap controller state, which tracks state for calling code */
28 static tap_state_t dummy_state = TAP_RESET;
29
30 static int dummy_clock; /* edge detector */
31
32 static int clock_count; /* count clocks in any stable state, only stable states */
33
34 static uint32_t dummy_data;
35
36 static bb_value_t dummy_read(void)
37 {
38 int data = 1 & dummy_data;
39 dummy_data = (dummy_data >> 1) | (1 << 31);
40 return data ? BB_HIGH : BB_LOW;
41 }
42
43 static int dummy_write(int tck, int tms, int tdi)
44 {
45 /* TAP standard: "state transitions occur on rising edge of clock" */
46 if (tck != dummy_clock) {
47 if (tck) {
48 tap_state_t old_state = dummy_state;
49 dummy_state = tap_state_transition(old_state, tms);
50
51 if (old_state != dummy_state) {
52 if (clock_count) {
53 LOG_DEBUG("dummy_tap: %d stable clocks", clock_count);
54 clock_count = 0;
55 }
56
57 LOG_DEBUG("dummy_tap: %s", tap_state_name(dummy_state));
58
59 #if defined(DEBUG)
60 if (dummy_state == TAP_DRCAPTURE)
61 dummy_data = 0x01255043;
62 #endif
63 } else {
64 /* this is a stable state clock edge, no change of state here,
65 * simply increment clock_count for subsequent logging
66 */
67 ++clock_count;
68 }
69 }
70 dummy_clock = tck;
71 }
72 return ERROR_OK;
73 }
74
75 static int dummy_reset(int trst, int srst)
76 {
77 dummy_clock = 0;
78
79 if (trst || (srst && (jtag_get_reset_config() & RESET_SRST_PULLS_TRST)))
80 dummy_state = TAP_RESET;
81
82 LOG_DEBUG("reset to: %s", tap_state_name(dummy_state));
83 return ERROR_OK;
84 }
85
86 static int dummy_led(int on)
87 {
88 return ERROR_OK;
89 }
90
91 static struct bitbang_interface dummy_bitbang = {
92 .read = &dummy_read,
93 .write = &dummy_write,
94 .reset = &dummy_reset,
95 .blink = &dummy_led,
96 };
97
98 static int dummy_khz(int khz, int *jtag_speed)
99 {
100 if (khz == 0)
101 *jtag_speed = 0;
102 else
103 *jtag_speed = 64000/khz;
104 return ERROR_OK;
105 }
106
107 static int dummy_speed_div(int speed, int *khz)
108 {
109 if (speed == 0)
110 *khz = 0;
111 else
112 *khz = 64000/speed;
113
114 return ERROR_OK;
115 }
116
117 static int dummy_speed(int speed)
118 {
119 return ERROR_OK;
120 }
121
122 static int dummy_init(void)
123 {
124 bitbang_interface = &dummy_bitbang;
125
126 return ERROR_OK;
127 }
128
129 static int dummy_quit(void)
130 {
131 return ERROR_OK;
132 }
133
134 static const struct command_registration dummy_command_handlers[] = {
135 {
136 .name = "dummy",
137 .mode = COMMAND_ANY,
138 .help = "dummy interface driver commands",
139
140 .chain = hello_command_handlers,
141 },
142 COMMAND_REGISTRATION_DONE,
143 };
144
145 /* The dummy driver is used to easily check the code path
146 * where the target is unresponsive.
147 */
148 struct jtag_interface dummy_interface = {
149 .name = "dummy",
150
151 .supported = DEBUG_CAP_TMS_SEQ,
152 .commands = dummy_command_handlers,
153 .transports = jtag_only,
154
155 .execute_queue = &bitbang_execute_queue,
156
157 .speed = &dummy_speed,
158 .khz = &dummy_khz,
159 .speed_div = &dummy_speed_div,
160
161 .init = &dummy_init,
162 .quit = &dummy_quit,
163 };

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