794f92f819881acb6f82d73468177d8c86af26e9
[openocd.git] / src / target / mips_ejtag.c
1 /***************************************************************************
2 * Copyright (C) 2008 by Spencer Oliver *
3 * spen@spen-soft.co.uk *
4 * *
5 * Copyright (C) 2008 by David T.L. Wong *
6 * *
7 * Copyright (C) 2009 by David N. Claffey <dnclaffey@gmail.com> *
8 * *
9 * This program is free software; you can redistribute it and/or modify *
10 * it under the terms of the GNU General Public License as published by *
11 * the Free Software Foundation; either version 2 of the License, or *
12 * (at your option) any later version. *
13 * *
14 * This program is distributed in the hope that it will be useful, *
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
17 * GNU General Public License for more details. *
18 * *
19 * You should have received a copy of the GNU General Public License *
20 * along with this program; if not, write to the *
21 * Free Software Foundation, Inc., *
22 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
23 ***************************************************************************/
24
25 #ifdef HAVE_CONFIG_H
26 #include "config.h"
27 #endif
28
29 #include "mips32.h"
30 #include "mips_ejtag.h"
31
32 void mips_ejtag_set_instr(struct mips_ejtag *ejtag_info, int new_instr)
33 {
34 struct jtag_tap *tap;
35
36 tap = ejtag_info->tap;
37 assert(tap != NULL);
38
39 if (buf_get_u32(tap->cur_instr, 0, tap->ir_length) != (uint32_t)new_instr) {
40 struct scan_field field;
41 uint8_t t[4];
42
43 field.num_bits = tap->ir_length;
44 field.out_value = t;
45 buf_set_u32(t, 0, field.num_bits, new_instr);
46 field.in_value = NULL;
47
48 jtag_add_ir_scan(tap, &field, TAP_IDLE);
49 }
50 }
51
52 int mips_ejtag_get_idcode(struct mips_ejtag *ejtag_info, uint32_t *idcode)
53 {
54 struct scan_field field;
55 uint8_t r[4];
56
57 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_IDCODE);
58
59 field.num_bits = 32;
60 field.out_value = NULL;
61 field.in_value = r;
62
63 jtag_add_dr_scan(ejtag_info->tap, 1, &field, TAP_IDLE);
64
65 int retval;
66 retval = jtag_execute_queue();
67 if (retval != ERROR_OK) {
68 LOG_ERROR("register read failed");
69 return retval;
70 }
71
72 *idcode = buf_get_u32(field.in_value, 0, 32);
73
74 return ERROR_OK;
75 }
76
77 static int mips_ejtag_get_impcode(struct mips_ejtag *ejtag_info, uint32_t *impcode)
78 {
79 struct scan_field field;
80 uint8_t r[4];
81
82 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_IMPCODE);
83
84 field.num_bits = 32;
85 field.out_value = NULL;
86 field.in_value = r;
87
88 jtag_add_dr_scan(ejtag_info->tap, 1, &field, TAP_IDLE);
89
90 int retval;
91 retval = jtag_execute_queue();
92 if (retval != ERROR_OK) {
93 LOG_ERROR("register read failed");
94 return retval;
95 }
96
97 *impcode = buf_get_u32(field.in_value, 0, 32);
98
99 return ERROR_OK;
100 }
101
102 void mips_ejtag_add_scan_96(struct mips_ejtag *ejtag_info, uint32_t ctrl, uint32_t data, uint8_t *in_scan_buf)
103 {
104 assert(ejtag_info->tap != NULL);
105 struct jtag_tap *tap = ejtag_info->tap;
106
107 struct scan_field field;
108 uint8_t out_scan[12];
109
110 /* processor access "all" register 96 bit */
111 field.num_bits = 96;
112
113 field.out_value = out_scan;
114 buf_set_u32(out_scan, 0, 32, ctrl);
115 buf_set_u32(out_scan + 4, 0, 32, data);
116 buf_set_u32(out_scan + 8, 0, 32, 0);
117
118 field.in_value = in_scan_buf;
119
120 jtag_add_dr_scan(tap, 1, &field, TAP_IDLE);
121
122 keep_alive();
123 }
124
125 int mips_ejtag_drscan_32(struct mips_ejtag *ejtag_info, uint32_t *data)
126 {
127 struct jtag_tap *tap;
128 tap = ejtag_info->tap;
129 assert(tap != NULL);
130
131 struct scan_field field;
132 uint8_t t[4], r[4];
133 int retval;
134
135 field.num_bits = 32;
136 field.out_value = t;
137 buf_set_u32(t, 0, field.num_bits, *data);
138 field.in_value = r;
139
140 jtag_add_dr_scan(tap, 1, &field, TAP_IDLE);
141
142 retval = jtag_execute_queue();
143 if (retval != ERROR_OK) {
144 LOG_ERROR("register read failed");
145 return retval;
146 }
147
148 *data = buf_get_u32(field.in_value, 0, 32);
149
150 keep_alive();
151
152 return ERROR_OK;
153 }
154
155 void mips_ejtag_drscan_32_out(struct mips_ejtag *ejtag_info, uint32_t data)
156 {
157 uint8_t t[4];
158 struct jtag_tap *tap;
159 tap = ejtag_info->tap;
160 assert(tap != NULL);
161
162 struct scan_field field;
163
164 field.num_bits = 32;
165 field.out_value = t;
166 buf_set_u32(t, 0, field.num_bits, data);
167
168 field.in_value = NULL;
169
170 jtag_add_dr_scan(tap, 1, &field, TAP_IDLE);
171 }
172
173 int mips_ejtag_drscan_8(struct mips_ejtag *ejtag_info, uint32_t *data)
174 {
175 struct jtag_tap *tap;
176 tap = ejtag_info->tap;
177 assert(tap != NULL);
178
179 struct scan_field field;
180 uint8_t t[4] = {0, 0, 0, 0}, r[4];
181 int retval;
182
183 field.num_bits = 8;
184 field.out_value = t;
185 buf_set_u32(t, 0, field.num_bits, *data);
186 field.in_value = r;
187
188 jtag_add_dr_scan(tap, 1, &field, TAP_IDLE);
189
190 retval = jtag_execute_queue();
191 if (retval != ERROR_OK) {
192 LOG_ERROR("register read failed");
193 return retval;
194 }
195
196 *data = buf_get_u32(field.in_value, 0, 32);
197
198 return ERROR_OK;
199 }
200
201 void mips_ejtag_drscan_8_out(struct mips_ejtag *ejtag_info, uint8_t data)
202 {
203 struct jtag_tap *tap;
204 tap = ejtag_info->tap;
205 assert(tap != NULL);
206
207 struct scan_field field;
208
209 field.num_bits = 8;
210 field.out_value = &data;
211 field.in_value = NULL;
212
213 jtag_add_dr_scan(tap, 1, &field, TAP_IDLE);
214 }
215
216 /* Set (to enable) or clear (to disable stepping) the SSt bit (bit 8) in Cp0 Debug reg (reg 23, sel 0) */
217 int mips_ejtag_config_step(struct mips_ejtag *ejtag_info, int enable_step)
218 {
219 int code_len = enable_step ? 6 : 7;
220
221 uint32_t *code = malloc(code_len * sizeof(uint32_t));
222 if (code == NULL) {
223 LOG_ERROR("Out of memory");
224 return ERROR_FAIL;
225 }
226 uint32_t *code_p = code;
227
228 *code_p++ = MIPS32_MTC0(1, 31, 0); /* move $1 to COP0 DeSave */
229 *code_p++ = MIPS32_MFC0(1, 23, 0), /* move COP0 Debug to $1 */
230 *code_p++ = MIPS32_ORI(1, 1, 0x0100); /* set SSt bit in debug reg */
231 if (!enable_step)
232 *code_p++ = MIPS32_XORI(1, 1, 0x0100); /* clear SSt bit in debug reg */
233
234 *code_p++ = MIPS32_MTC0(1, 23, 0); /* move $1 to COP0 Debug */
235 *code_p++ = MIPS32_B(NEG16((code_len - 1))); /* jump to start */
236 *code_p = MIPS32_MFC0(1, 31, 0); /* move COP0 DeSave to $1 */
237
238 int retval = mips32_pracc_exec(ejtag_info, code_len, code, 0, NULL, 0, NULL, 1);
239
240 free(code);
241 return retval;
242 }
243
244 int mips_ejtag_enter_debug(struct mips_ejtag *ejtag_info)
245 {
246 uint32_t ejtag_ctrl;
247 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
248
249 /* set debug break bit */
250 ejtag_ctrl = ejtag_info->ejtag_ctrl | EJTAG_CTRL_JTAGBRK;
251 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
252
253 /* break bit will be cleared by hardware */
254 ejtag_ctrl = ejtag_info->ejtag_ctrl;
255 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
256 LOG_DEBUG("ejtag_ctrl: 0x%8.8" PRIx32 "", ejtag_ctrl);
257 if ((ejtag_ctrl & EJTAG_CTRL_BRKST) == 0) {
258 LOG_ERROR("Failed to enter Debug Mode!");
259 return ERROR_FAIL;
260 }
261
262 return ERROR_OK;
263 }
264
265 int mips_ejtag_exit_debug(struct mips_ejtag *ejtag_info)
266 {
267 uint32_t inst;
268 inst = MIPS32_DRET;
269
270 /* execute our dret instruction */
271 int retval = mips32_pracc_exec(ejtag_info, 1, &inst, 0, NULL, 0, NULL, 0);
272
273 /* pic32mx workaround, false pending at low core clock */
274 jtag_add_sleep(1000);
275
276 return retval;
277 }
278
279 int mips_ejtag_init(struct mips_ejtag *ejtag_info)
280 {
281 uint32_t ejtag_version;
282 int retval;
283
284 retval = mips_ejtag_get_impcode(ejtag_info, &ejtag_info->impcode);
285 if (retval != ERROR_OK)
286 return retval;
287 LOG_DEBUG("impcode: 0x%8.8" PRIx32 "", ejtag_info->impcode);
288
289 /* get ejtag version */
290 ejtag_version = ((ejtag_info->impcode >> 29) & 0x07);
291
292 switch (ejtag_version) {
293 case 0:
294 LOG_DEBUG("EJTAG: Version 1 or 2.0 Detected");
295 break;
296 case 1:
297 LOG_DEBUG("EJTAG: Version 2.5 Detected");
298 break;
299 case 2:
300 LOG_DEBUG("EJTAG: Version 2.6 Detected");
301 break;
302 case 3:
303 LOG_DEBUG("EJTAG: Version 3.1 Detected");
304 break;
305 case 4:
306 LOG_DEBUG("EJTAG: Version 4.1 Detected");
307 break;
308 case 5:
309 LOG_DEBUG("EJTAG: Version 5.1 Detected");
310 break;
311 default:
312 LOG_DEBUG("EJTAG: Unknown Version Detected");
313 break;
314 }
315 LOG_DEBUG("EJTAG: features:%s%s%s%s%s%s%s",
316 ejtag_info->impcode & EJTAG_IMP_R3K ? " R3k" : " R4k",
317 ejtag_info->impcode & EJTAG_IMP_DINT ? " DINT" : "",
318 ejtag_info->impcode & (1 << 22) ? " ASID_8" : "",
319 ejtag_info->impcode & (1 << 21) ? " ASID_6" : "",
320 ejtag_info->impcode & EJTAG_IMP_MIPS16 ? " MIPS16" : "",
321 ejtag_info->impcode & EJTAG_IMP_NODMA ? " noDMA" : " DMA",
322 ejtag_info->impcode & EJTAG_DCR_MIPS64 ? " MIPS64" : " MIPS32");
323
324 if ((ejtag_info->impcode & EJTAG_IMP_NODMA) == 0)
325 LOG_DEBUG("EJTAG: DMA Access Mode Support Enabled");
326
327 /* set initial state for ejtag control reg */
328 ejtag_info->ejtag_ctrl = EJTAG_CTRL_ROCC | EJTAG_CTRL_PRACC | EJTAG_CTRL_PROBEN | EJTAG_CTRL_SETDEV;
329 ejtag_info->fast_access_save = -1;
330
331 return ERROR_OK;
332 }
333
334 int mips_ejtag_fastdata_scan(struct mips_ejtag *ejtag_info, int write_t, uint32_t *data)
335 {
336 struct jtag_tap *tap;
337
338 tap = ejtag_info->tap;
339 assert(tap != NULL);
340
341 struct scan_field fields[2];
342 uint8_t spracc = 0;
343 uint8_t t[4] = {0, 0, 0, 0};
344
345 /* fastdata 1-bit register */
346 fields[0].num_bits = 1;
347 fields[0].out_value = &spracc;
348 fields[0].in_value = NULL;
349
350 /* processor access data register 32 bit */
351 fields[1].num_bits = 32;
352 fields[1].out_value = t;
353
354 if (write_t) {
355 fields[1].in_value = NULL;
356 buf_set_u32(t, 0, 32, *data);
357 } else
358 fields[1].in_value = (void *) data;
359
360 jtag_add_dr_scan(tap, 2, fields, TAP_IDLE);
361
362 if (!write_t && data)
363 jtag_add_callback(mips_le_to_h_u32,
364 (jtag_callback_data_t) data);
365
366 keep_alive();
367
368 return ERROR_OK;
369 }