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- added support for Intel/Marvel PXA27x (XScale) targets
[openocd.git] / src / jtag / bitbang.c
1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
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 "bitbang.h"
25
26 /* project specific includes */
27 #include "log.h"
28 #include "types.h"
29 #include "jtag.h"
30 #include "configuration.h"
31
32 /* system includes */
33 #include <string.h>
34 #include <stdlib.h>
35 #include <unistd.h>
36
37 #include <sys/time.h>
38 #include <time.h>
39
40 bitbang_interface_t *bitbang_interface;
41
42 int bitbang_execute_queue(void);
43
44 void bitbang_end_state(enum tap_state state)
45 {
46 if (tap_move_map[state] != -1)
47 end_state = state;
48 else
49 {
50 ERROR("BUG: %i is not a valid end state", state);
51 exit(-1);
52 }
53 }
54
55 void bitbang_state_move(void) {
56
57 int i=0, tms=0;
58 u8 tms_scan = TAP_MOVE(cur_state, end_state);
59
60 for (i = 0; i < 7; i++)
61 {
62 tms = (tms_scan >> i) & 1;
63 bitbang_interface->write(0, tms, 0);
64 bitbang_interface->write(1, tms, 0);
65 }
66 bitbang_interface->write(0, tms, 0);
67
68 cur_state = end_state;
69 }
70
71 void bitbang_path_move(pathmove_command_t *cmd)
72 {
73 int num_states = cmd->num_states;
74 int state_count;
75
76 state_count = 0;
77 while (num_states)
78 {
79 if (tap_transitions[cur_state].low == cmd->path[state_count])
80 {
81 bitbang_interface->write(0, 0, 0);
82 bitbang_interface->write(1, 0, 0);
83 }
84 else if (tap_transitions[cur_state].high == cmd->path[state_count])
85 {
86 bitbang_interface->write(0, 1, 0);
87 bitbang_interface->write(1, 1, 0);
88 }
89 else
90 {
91 ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_strings[cur_state], tap_state_strings[cmd->path[state_count]]);
92 exit(-1);
93 }
94
95 cur_state = cmd->path[state_count];
96 state_count++;
97 num_states--;
98 }
99
100 end_state = cur_state;
101 }
102
103 void bitbang_runtest(int num_cycles)
104 {
105 int i;
106
107 enum tap_state saved_end_state = end_state;
108
109 /* only do a state_move when we're not already in RTI */
110 if (cur_state != TAP_RTI)
111 {
112 bitbang_end_state(TAP_RTI);
113 bitbang_state_move();
114 }
115
116 /* execute num_cycles */
117 bitbang_interface->write(0, 0, 0);
118 for (i = 0; i < num_cycles; i++)
119 {
120 bitbang_interface->write(1, 0, 0);
121 bitbang_interface->write(0, 0, 0);
122 }
123
124 /* finish in end_state */
125 bitbang_end_state(saved_end_state);
126 if (cur_state != end_state)
127 bitbang_state_move();
128 }
129
130 void bitbang_scan(int ir_scan, enum scan_type type, u8 *buffer, int scan_size)
131 {
132 enum tap_state saved_end_state = end_state;
133 int bit_cnt;
134
135 if (!((!ir_scan && (cur_state == TAP_SD)) || (ir_scan && (cur_state == TAP_SI))))
136 {
137 if (ir_scan)
138 bitbang_end_state(TAP_SI);
139 else
140 bitbang_end_state(TAP_SD);
141
142 bitbang_state_move();
143 bitbang_end_state(saved_end_state);
144 }
145
146 for (bit_cnt = 0; bit_cnt < scan_size; bit_cnt++)
147 {
148 /* set TMS high on the last bit unless we want to end in TAP_SD/SI */
149 int tms;
150 if ((ir_scan && (end_state == TAP_SI)) ||
151 (!ir_scan && (end_state == TAP_SD)))
152 {
153 tms = 0;
154 } else {
155 tms = (bit_cnt==scan_size-1) ? 1 : 0;
156 }
157
158 /* if we're just reading the scan, but don't care about the output
159 * default to outputting 'low', this also makes valgrind traces more readable,
160 * as it removes the dependency on an uninitialised value
161 */
162 if ((type != SCAN_IN) && ((buffer[bit_cnt/8] >> (bit_cnt % 8)) & 0x1))
163 {
164 bitbang_interface->write(0, (bit_cnt==scan_size-1) ? 1 : 0, 1);
165 bitbang_interface->write(1, (bit_cnt==scan_size-1) ? 1 : 0, 1);
166 } else {
167 bitbang_interface->write(0, (bit_cnt==scan_size-1) ? 1 : 0, 0);
168 bitbang_interface->write(1, (bit_cnt==scan_size-1) ? 1 : 0, 0);
169 }
170
171 if (type != SCAN_OUT)
172 {
173 if (bitbang_interface->read())
174 buffer[(bit_cnt)/8] |= 1 << ((bit_cnt) % 8);
175 else
176 buffer[(bit_cnt)/8] &= ~(1 << ((bit_cnt) % 8));
177 }
178 }
179
180 /* Exit1 -> Pause */
181 bitbang_interface->write(0, 0, 0);
182 bitbang_interface->write(1, 0, 0);
183
184 if (ir_scan)
185 cur_state = TAP_PI;
186 else
187 cur_state = TAP_PD;
188
189 if (cur_state != end_state)
190 bitbang_state_move();
191 }
192
193 int bitbang_execute_queue(void)
194 {
195 jtag_command_t *cmd = jtag_command_queue; /* currently processed command */
196 int scan_size;
197 enum scan_type type;
198 u8 *buffer;
199 int retval;
200
201 if (!bitbang_interface)
202 {
203 ERROR("BUG: Bitbang interface called, but not yet initialized");
204 exit(-1);
205 }
206
207 /* return ERROR_OK, unless a jtag_read_buffer returns a failed check
208 * that wasn't handled by a caller-provided error handler
209 */
210 retval = ERROR_OK;
211
212 while (cmd)
213 {
214 switch (cmd->type)
215 {
216 case JTAG_END_STATE:
217 #ifdef _DEBUG_JTAG_IO_
218 DEBUG("end_state: %i", cmd->cmd.end_state->end_state);
219 #endif
220 if (cmd->cmd.end_state->end_state != -1)
221 bitbang_end_state(cmd->cmd.end_state->end_state);
222 break;
223 case JTAG_RESET:
224 #ifdef _DEBUG_JTAG_IO_
225 DEBUG("reset trst: %i srst %i", cmd->cmd.reset->trst, cmd->cmd.reset->srst);
226 #endif
227 if (cmd->cmd.reset->trst == 1)
228 {
229 cur_state = TAP_TLR;
230 }
231 bitbang_interface->reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
232 break;
233 case JTAG_RUNTEST:
234 #ifdef _DEBUG_JTAG_IO_
235 DEBUG("runtest %i cycles, end in %i", cmd->cmd.runtest->num_cycles, cmd->cmd.runtest->end_state);
236 #endif
237 if (cmd->cmd.runtest->end_state != -1)
238 bitbang_end_state(cmd->cmd.runtest->end_state);
239 bitbang_runtest(cmd->cmd.runtest->num_cycles);
240 break;
241 case JTAG_STATEMOVE:
242 #ifdef _DEBUG_JTAG_IO_
243 DEBUG("statemove end in %i", cmd->cmd.statemove->end_state);
244 #endif
245 if (cmd->cmd.statemove->end_state != -1)
246 bitbang_end_state(cmd->cmd.statemove->end_state);
247 bitbang_state_move();
248 break;
249 case JTAG_PATHMOVE:
250 #ifdef _DEBUG_JTAG_IO_
251 DEBUG("pathmove: %i states, end in %i", cmd->cmd.pathmove->num_states, cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]);
252 #endif
253 bitbang_path_move(cmd->cmd.pathmove);
254 break;
255 case JTAG_SCAN:
256 #ifdef _DEBUG_JTAG_IO_
257 DEBUG("%s scan end in %i", (cmd->cmd.scan->ir_scan) ? "IR" : "DR", cmd->cmd.scan->end_state);
258 #endif
259 if (cmd->cmd.scan->end_state != -1)
260 bitbang_end_state(cmd->cmd.scan->end_state);
261 scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
262 type = jtag_scan_type(cmd->cmd.scan);
263 bitbang_scan(cmd->cmd.scan->ir_scan, type, buffer, scan_size);
264 if (jtag_read_buffer(buffer, cmd->cmd.scan) != ERROR_OK)
265 retval = ERROR_JTAG_QUEUE_FAILED;
266 if (buffer)
267 free(buffer);
268 break;
269 case JTAG_SLEEP:
270 #ifdef _DEBUG_JTAG_IO_
271 DEBUG("sleep %i", cmd->cmd.sleep->us);
272 #endif
273 jtag_sleep(cmd->cmd.sleep->us);
274 break;
275 default:
276 ERROR("BUG: unknown JTAG command type encountered");
277 exit(-1);
278 }
279 cmd = cmd->next;
280 }
281
282 return retval;
283 }
284
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