11b6f71ae10fa4223c954d3a0a43cee8db3a59d3
[openocd.git] / src / jtag / 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, write to the *
17 * Free Software Foundation, Inc., *
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
19 ***************************************************************************/
20 #ifdef HAVE_CONFIG_H
21 #include "config.h"
22 #endif
23
24 #include "interface.h"
25 #include "bitbang.h"
26
27
28 /* my private tap controller state, which tracks state for calling code */
29 static tap_state_t dummy_state = TAP_RESET;
30
31 static int dummy_clock; /* edge detector */
32
33 static int clock_count; /* count clocks in any stable state, only stable states */
34
35 static uint32_t dummy_data;
36
37
38 static int dummy_read(void)
39 {
40 int data = 1 & dummy_data;
41 dummy_data = (dummy_data >> 1) | (1 << 31);
42 return data;
43 }
44
45
46 static void dummy_write(int tck, int tms, int tdi)
47 {
48 /* TAP standard: "state transitions occur on rising edge of clock" */
49 if (tck != dummy_clock)
50 {
51 if (tck)
52 {
53 tap_state_t old_state = dummy_state;
54 dummy_state = tap_state_transition(old_state, tms);
55
56 if (old_state != dummy_state)
57 {
58 if (clock_count)
59 {
60 LOG_DEBUG("dummy_tap: %d stable clocks", clock_count);
61 clock_count = 0;
62 }
63
64 LOG_DEBUG("dummy_tap: %s", tap_state_name(dummy_state));
65
66 #if defined(DEBUG)
67 if (dummy_state == TAP_DRCAPTURE)
68 dummy_data = 0x01255043;
69 #endif
70 }
71 else
72 {
73 /* this is a stable state clock edge, no change of state here,
74 * simply increment clock_count for subsequent logging
75 */
76 ++clock_count;
77 }
78 }
79 dummy_clock = tck;
80 }
81 }
82
83 static void dummy_reset(int trst, int srst)
84 {
85 dummy_clock = 0;
86
87 if (trst || (srst && (jtag_get_reset_config() & RESET_SRST_PULLS_TRST)))
88 dummy_state = TAP_RESET;
89
90 LOG_DEBUG("reset to: %s", tap_state_name(dummy_state));
91 }
92
93 static void dummy_led(int on)
94 {
95 }
96
97 static struct bitbang_interface dummy_bitbang = {
98 .read = &dummy_read,
99 .write = &dummy_write,
100 .reset = &dummy_reset,
101 .blink = &dummy_led,
102 };
103
104
105 static int dummy_khz(int khz, int *jtag_speed)
106 {
107 if (khz == 0)
108 {
109 *jtag_speed = 0;
110 }
111 else
112 {
113 *jtag_speed = 64000/khz;
114 }
115 return ERROR_OK;
116 }
117
118 static int dummy_speed_div(int speed, int *khz)
119 {
120 if (speed == 0)
121 {
122 *khz = 0;
123 }
124 else
125 {
126 *khz = 64000/speed;
127 }
128
129 return ERROR_OK;
130 }
131
132 static int dummy_speed(int speed)
133 {
134 return ERROR_OK;
135 }
136
137 static int dummy_init(void)
138 {
139 bitbang_interface = &dummy_bitbang;
140
141 return ERROR_OK;
142 }
143
144 static int dummy_quit(void)
145 {
146 return ERROR_OK;
147 }
148
149 /* The dummy driver is used to easily check the code path
150 * where the target is unresponsive.
151 */
152 struct jtag_interface dummy_interface = {
153 .name = "dummy",
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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