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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         struct pracc_queue_info ctx = {.max_code = 7};
220         pracc_queue_init(&ctx);
221         if (ctx.retval != ERROR_OK)
222                 goto exit;
223
224         pracc_add(&ctx, 0, MIPS32_MFC0(8, 23, 0));                      /* move COP0 Debug to $8 */
225         pracc_add(&ctx, 0, MIPS32_ORI(8, 8, 0x0100));                   /* set SSt bit in debug reg */
226         if (!enable_step)
227                 pracc_add(&ctx, 0, MIPS32_XORI(8, 8, 0x0100));          /* clear SSt bit in debug reg */
228
229         pracc_add(&ctx, 0, MIPS32_MTC0(8, 23, 0));                      /* move $8 to COP0 Debug */
230         pracc_add(&ctx, 0, MIPS32_LUI(8, UPPER16(ejtag_info->reg8)));           /* restore upper 16 bits  of $8 */
231         pracc_add(&ctx, 0, MIPS32_B(NEG16((ctx.code_count + 1))));                      /* jump to start */
232         pracc_add(&ctx, 0, MIPS32_ORI(8, 8, LOWER16(ejtag_info->reg8)));        /* restore lower 16 bits of $8 */
233
234         ctx.retval = mips32_pracc_queue_exec(ejtag_info, &ctx, NULL);
235 exit:
236         pracc_queue_free(&ctx);
237         return ctx.retval;
238 }
239
240 int mips_ejtag_enter_debug(struct mips_ejtag *ejtag_info)
241 {
242         uint32_t ejtag_ctrl;
243         mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
244
245         /* set debug break bit */
246         ejtag_ctrl = ejtag_info->ejtag_ctrl | EJTAG_CTRL_JTAGBRK;
247         mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
248
249         /* break bit will be cleared by hardware */
250         ejtag_ctrl = ejtag_info->ejtag_ctrl;
251         mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
252         LOG_DEBUG("ejtag_ctrl: 0x%8.8" PRIx32 "", ejtag_ctrl);
253         if ((ejtag_ctrl & EJTAG_CTRL_BRKST) == 0) {
254                 LOG_ERROR("Failed to enter Debug Mode!");
255                 return ERROR_FAIL;
256         }
257
258         return ERROR_OK;
259 }
260
261 int mips_ejtag_exit_debug(struct mips_ejtag *ejtag_info)
262 {
263         uint32_t inst;
264         inst = MIPS32_DRET;
265
266         /* execute our dret instruction */
267         int retval = mips32_pracc_exec(ejtag_info, 1, &inst, 0, NULL, 0, NULL, 0);
268
269         /* pic32mx workaround, false pending at low core clock */
270         jtag_add_sleep(1000);
271
272         return retval;
273 }
274
275 int mips_ejtag_init(struct mips_ejtag *ejtag_info)
276 {
277         uint32_t ejtag_version;
278         int retval;
279
280         retval = mips_ejtag_get_impcode(ejtag_info, &ejtag_info->impcode);
281         if (retval != ERROR_OK)
282                 return retval;
283         LOG_DEBUG("impcode: 0x%8.8" PRIx32 "", ejtag_info->impcode);
284
285         /* get ejtag version */
286         ejtag_version = ((ejtag_info->impcode >> 29) & 0x07);
287
288         switch (ejtag_version) {
289                 case 0:
290                         LOG_DEBUG("EJTAG: Version 1 or 2.0 Detected");
291                         break;
292                 case 1:
293                         LOG_DEBUG("EJTAG: Version 2.5 Detected");
294                         break;
295                 case 2:
296                         LOG_DEBUG("EJTAG: Version 2.6 Detected");
297                         break;
298                 case 3:
299                         LOG_DEBUG("EJTAG: Version 3.1 Detected");
300                         break;
301                 case 4:
302                         LOG_DEBUG("EJTAG: Version 4.1 Detected");
303                         break;
304                 case 5:
305                         LOG_DEBUG("EJTAG: Version 5.1 Detected");
306                         break;
307                 default:
308                         LOG_DEBUG("EJTAG: Unknown Version Detected");
309                         break;
310         }
311         LOG_DEBUG("EJTAG: features:%s%s%s%s%s%s%s",
312                 ejtag_info->impcode & EJTAG_IMP_R3K ? " R3k" : " R4k",
313                 ejtag_info->impcode & EJTAG_IMP_DINT ? " DINT" : "",
314                 ejtag_info->impcode & (1 << 22) ? " ASID_8" : "",
315                 ejtag_info->impcode & (1 << 21) ? " ASID_6" : "",
316                 ejtag_info->impcode & EJTAG_IMP_MIPS16 ? " MIPS16" : "",
317                 ejtag_info->impcode & EJTAG_IMP_NODMA ? " noDMA" : " DMA",
318                 ejtag_info->impcode & EJTAG_DCR_MIPS64  ? " MIPS64" : " MIPS32");
319
320         if ((ejtag_info->impcode & EJTAG_IMP_NODMA) == 0)
321                 LOG_DEBUG("EJTAG: DMA Access Mode Support Enabled");
322
323         /* set initial state for ejtag control reg */
324         ejtag_info->ejtag_ctrl = EJTAG_CTRL_ROCC | EJTAG_CTRL_PRACC | EJTAG_CTRL_PROBEN | EJTAG_CTRL_SETDEV;
325         ejtag_info->fast_access_save = -1;
326
327         return ERROR_OK;
328 }
329
330 int mips_ejtag_fastdata_scan(struct mips_ejtag *ejtag_info, int write_t, uint32_t *data)
331 {
332         struct jtag_tap *tap;
333
334         tap = ejtag_info->tap;
335         assert(tap != NULL);
336
337         struct scan_field fields[2];
338         uint8_t spracc = 0;
339         uint8_t t[4] = {0, 0, 0, 0};
340
341         /* fastdata 1-bit register */
342         fields[0].num_bits = 1;
343         fields[0].out_value = &spracc;
344         fields[0].in_value = NULL;
345
346         /* processor access data register 32 bit */
347         fields[1].num_bits = 32;
348         fields[1].out_value = t;
349
350         if (write_t) {
351                 fields[1].in_value = NULL;
352                 buf_set_u32(t, 0, 32, *data);
353         } else
354                 fields[1].in_value = (void *) data;
355
356         jtag_add_dr_scan(tap, 2, fields, TAP_IDLE);
357
358         if (!write_t && data)
359                 jtag_add_callback(mips_le_to_h_u32,
360                         (jtag_callback_data_t) data);
361
362         keep_alive();
363
364         return ERROR_OK;
365 }