1 /***************************************************************************
2 * Copyright (C) 2008 by Spencer Oliver *
3 * spen@spen-soft.co.uk *
5 * Copyright (C) 2008 by David T.L. Wong *
7 * Copyright (C) 2009 by David N. Claffey <dnclaffey@gmail.com> *
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. *
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. *
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 ***************************************************************************/
30 #include "mips_ejtag.h"
32 void mips_ejtag_set_instr(struct mips_ejtag
*ejtag_info
, int new_instr
)
36 tap
= ejtag_info
->tap
;
39 if (buf_get_u32(tap
->cur_instr
, 0, tap
->ir_length
) != (uint32_t)new_instr
) {
40 struct scan_field field
;
43 field
.num_bits
= tap
->ir_length
;
45 buf_set_u32(t
, 0, field
.num_bits
, new_instr
);
46 field
.in_value
= NULL
;
48 jtag_add_ir_scan(tap
, &field
, TAP_IDLE
);
52 int mips_ejtag_get_idcode(struct mips_ejtag
*ejtag_info
, uint32_t *idcode
)
54 struct scan_field field
;
57 mips_ejtag_set_instr(ejtag_info
, EJTAG_INST_IDCODE
);
60 field
.out_value
= NULL
;
63 jtag_add_dr_scan(ejtag_info
->tap
, 1, &field
, TAP_IDLE
);
66 retval
= jtag_execute_queue();
67 if (retval
!= ERROR_OK
) {
68 LOG_ERROR("register read failed");
72 *idcode
= buf_get_u32(field
.in_value
, 0, 32);
77 static int mips_ejtag_get_impcode(struct mips_ejtag
*ejtag_info
, uint32_t *impcode
)
79 struct scan_field field
;
82 mips_ejtag_set_instr(ejtag_info
, EJTAG_INST_IMPCODE
);
85 field
.out_value
= NULL
;
88 jtag_add_dr_scan(ejtag_info
->tap
, 1, &field
, TAP_IDLE
);
91 retval
= jtag_execute_queue();
92 if (retval
!= ERROR_OK
) {
93 LOG_ERROR("register read failed");
97 *impcode
= buf_get_u32(field
.in_value
, 0, 32);
102 void mips_ejtag_add_scan_96(struct mips_ejtag
*ejtag_info
, uint32_t ctrl
, uint32_t data
, uint8_t *in_scan_buf
)
104 assert(ejtag_info
->tap
!= NULL
);
105 struct jtag_tap
*tap
= ejtag_info
->tap
;
107 struct scan_field field
;
108 uint8_t out_scan
[12];
110 /* processor access "all" register 96 bit */
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);
118 field
.in_value
= in_scan_buf
;
120 jtag_add_dr_scan(tap
, 1, &field
, TAP_IDLE
);
125 int mips_ejtag_drscan_32(struct mips_ejtag
*ejtag_info
, uint32_t *data
)
127 struct jtag_tap
*tap
;
128 tap
= ejtag_info
->tap
;
131 struct scan_field field
;
137 buf_set_u32(t
, 0, field
.num_bits
, *data
);
140 jtag_add_dr_scan(tap
, 1, &field
, TAP_IDLE
);
142 retval
= jtag_execute_queue();
143 if (retval
!= ERROR_OK
) {
144 LOG_ERROR("register read failed");
148 *data
= buf_get_u32(field
.in_value
, 0, 32);
155 void mips_ejtag_drscan_32_out(struct mips_ejtag
*ejtag_info
, uint32_t data
)
158 struct jtag_tap
*tap
;
159 tap
= ejtag_info
->tap
;
162 struct scan_field field
;
166 buf_set_u32(t
, 0, field
.num_bits
, data
);
168 field
.in_value
= NULL
;
170 jtag_add_dr_scan(tap
, 1, &field
, TAP_IDLE
);
173 int mips_ejtag_drscan_8(struct mips_ejtag
*ejtag_info
, uint32_t *data
)
175 struct jtag_tap
*tap
;
176 tap
= ejtag_info
->tap
;
179 struct scan_field field
;
180 uint8_t t
[4] = {0, 0, 0, 0}, r
[4];
185 buf_set_u32(t
, 0, field
.num_bits
, *data
);
188 jtag_add_dr_scan(tap
, 1, &field
, TAP_IDLE
);
190 retval
= jtag_execute_queue();
191 if (retval
!= ERROR_OK
) {
192 LOG_ERROR("register read failed");
196 *data
= buf_get_u32(field
.in_value
, 0, 32);
201 void mips_ejtag_drscan_8_out(struct mips_ejtag
*ejtag_info
, uint8_t data
)
203 struct jtag_tap
*tap
;
204 tap
= ejtag_info
->tap
;
207 struct scan_field field
;
210 field
.out_value
= &data
;
211 field
.in_value
= NULL
;
213 jtag_add_dr_scan(tap
, 1, &field
, TAP_IDLE
);
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
)
219 struct pracc_queue_info ctx
= {.max_code
= 7};
220 pracc_queue_init(&ctx
);
221 if (ctx
.retval
!= ERROR_OK
)
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 */
227 pracc_add(&ctx
, 0, MIPS32_XORI(8, 8, 0x0100)); /* clear SSt bit in debug reg */
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 */
234 ctx
.retval
= mips32_pracc_queue_exec(ejtag_info
, &ctx
, NULL
);
236 pracc_queue_free(&ctx
);
240 int mips_ejtag_enter_debug(struct mips_ejtag
*ejtag_info
)
243 mips_ejtag_set_instr(ejtag_info
, EJTAG_INST_CONTROL
);
245 /* set debug break bit */
246 ejtag_ctrl
= ejtag_info
->ejtag_ctrl
| EJTAG_CTRL_JTAGBRK
;
247 mips_ejtag_drscan_32(ejtag_info
, &ejtag_ctrl
);
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!");
261 int mips_ejtag_exit_debug(struct mips_ejtag
*ejtag_info
)
266 /* execute our dret instruction */
267 int retval
= mips32_pracc_exec(ejtag_info
, 1, &inst
, 0, NULL
, 0, NULL
, 0);
269 /* pic32mx workaround, false pending at low core clock */
270 jtag_add_sleep(1000);
275 int mips_ejtag_init(struct mips_ejtag
*ejtag_info
)
277 uint32_t ejtag_version
;
280 retval
= mips_ejtag_get_impcode(ejtag_info
, &ejtag_info
->impcode
);
281 if (retval
!= ERROR_OK
)
283 LOG_DEBUG("impcode: 0x%8.8" PRIx32
"", ejtag_info
->impcode
);
285 /* get ejtag version */
286 ejtag_version
= ((ejtag_info
->impcode
>> 29) & 0x07);
288 switch (ejtag_version
) {
290 LOG_DEBUG("EJTAG: Version 1 or 2.0 Detected");
293 LOG_DEBUG("EJTAG: Version 2.5 Detected");
296 LOG_DEBUG("EJTAG: Version 2.6 Detected");
299 LOG_DEBUG("EJTAG: Version 3.1 Detected");
302 LOG_DEBUG("EJTAG: Version 4.1 Detected");
305 LOG_DEBUG("EJTAG: Version 5.1 Detected");
308 LOG_DEBUG("EJTAG: Unknown Version Detected");
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");
320 if ((ejtag_info
->impcode
& EJTAG_IMP_NODMA
) == 0)
321 LOG_DEBUG("EJTAG: DMA Access Mode Support Enabled");
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;
330 int mips_ejtag_fastdata_scan(struct mips_ejtag
*ejtag_info
, int write_t
, uint32_t *data
)
332 struct jtag_tap
*tap
;
334 tap
= ejtag_info
->tap
;
337 struct scan_field fields
[2];
339 uint8_t t
[4] = {0, 0, 0, 0};
341 /* fastdata 1-bit register */
342 fields
[0].num_bits
= 1;
343 fields
[0].out_value
= &spracc
;
344 fields
[0].in_value
= NULL
;
346 /* processor access data register 32 bit */
347 fields
[1].num_bits
= 32;
348 fields
[1].out_value
= t
;
351 fields
[1].in_value
= NULL
;
352 buf_set_u32(t
, 0, 32, *data
);
354 fields
[1].in_value
= (void *) data
;
356 jtag_add_dr_scan(tap
, 2, fields
, TAP_IDLE
);
358 if (!write_t
&& data
)
359 jtag_add_callback(mips_le_to_h_u32
,
360 (jtag_callback_data_t
) data
);