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 int mips_ejtag_drscan_32(struct mips_ejtag
*ejtag_info
, uint32_t *data
)
104 struct jtag_tap
*tap
;
105 tap
= ejtag_info
->tap
;
108 struct scan_field field
;
114 buf_set_u32(t
, 0, field
.num_bits
, *data
);
117 jtag_add_dr_scan(tap
, 1, &field
, TAP_IDLE
);
119 retval
= jtag_execute_queue();
120 if (retval
!= ERROR_OK
) {
121 LOG_ERROR("register read failed");
125 *data
= buf_get_u32(field
.in_value
, 0, 32);
132 void mips_ejtag_drscan_32_out(struct mips_ejtag
*ejtag_info
, uint32_t data
)
135 struct jtag_tap
*tap
;
136 tap
= ejtag_info
->tap
;
139 struct scan_field field
;
143 buf_set_u32(t
, 0, field
.num_bits
, data
);
145 field
.in_value
= NULL
;
147 jtag_add_dr_scan(tap
, 1, &field
, TAP_IDLE
);
150 int mips_ejtag_drscan_8(struct mips_ejtag
*ejtag_info
, uint32_t *data
)
152 struct jtag_tap
*tap
;
153 tap
= ejtag_info
->tap
;
156 struct scan_field field
;
157 uint8_t t
[4] = {0, 0, 0, 0}, r
[4];
162 buf_set_u32(t
, 0, field
.num_bits
, *data
);
165 jtag_add_dr_scan(tap
, 1, &field
, TAP_IDLE
);
167 retval
= jtag_execute_queue();
168 if (retval
!= ERROR_OK
) {
169 LOG_ERROR("register read failed");
173 *data
= buf_get_u32(field
.in_value
, 0, 32);
178 void mips_ejtag_drscan_8_out(struct mips_ejtag
*ejtag_info
, uint8_t data
)
180 struct jtag_tap
*tap
;
181 tap
= ejtag_info
->tap
;
184 struct scan_field field
;
187 field
.out_value
= &data
;
188 field
.in_value
= NULL
;
190 jtag_add_dr_scan(tap
, 1, &field
, TAP_IDLE
);
193 static int mips_ejtag_step_enable(struct mips_ejtag
*ejtag_info
)
195 static const uint32_t code
[] = {
196 MIPS32_MTC0(1, 31, 0), /* move $1 to COP0 DeSave */
197 MIPS32_MFC0(1, 23, 0), /* move COP0 Debug to $1 */
198 MIPS32_ORI(1, 1, 0x0100), /* set SSt bit in debug reg */
199 MIPS32_MTC0(1, 23, 0), /* move $1 to COP0 Debug */
201 MIPS32_MFC0(1, 31, 0), /* move COP0 DeSave to $1 */
204 return mips32_pracc_exec(ejtag_info
, ARRAY_SIZE(code
), code
,
205 0, NULL
, 0, NULL
, 1);
208 static int mips_ejtag_step_disable(struct mips_ejtag
*ejtag_info
)
210 static const uint32_t code
[] = {
211 MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
212 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK
)), /* $15 = MIPS32_PRACC_STACK */
213 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK
)),
214 MIPS32_SW(1, 0, 15), /* sw $1,($15) */
215 MIPS32_SW(2, 0, 15), /* sw $2,($15) */
216 MIPS32_MFC0(1, 23, 0), /* move COP0 Debug to $1 */
217 MIPS32_LUI(2, 0xFFFF), /* $2 = 0xfffffeff */
218 MIPS32_ORI(2, 2, 0xFEFF),
220 MIPS32_MTC0(1, 23, 0), /* move $1 to COP0 Debug */
224 MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
227 return mips32_pracc_exec(ejtag_info
, ARRAY_SIZE(code
), code
,
228 0, NULL
, 0, NULL
, 1);
231 int mips_ejtag_config_step(struct mips_ejtag
*ejtag_info
, int enable_step
)
234 return mips_ejtag_step_enable(ejtag_info
);
235 return mips_ejtag_step_disable(ejtag_info
);
238 int mips_ejtag_enter_debug(struct mips_ejtag
*ejtag_info
)
241 mips_ejtag_set_instr(ejtag_info
, EJTAG_INST_CONTROL
);
243 /* set debug break bit */
244 ejtag_ctrl
= ejtag_info
->ejtag_ctrl
| EJTAG_CTRL_JTAGBRK
;
245 mips_ejtag_drscan_32(ejtag_info
, &ejtag_ctrl
);
247 /* break bit will be cleared by hardware */
248 ejtag_ctrl
= ejtag_info
->ejtag_ctrl
;
249 mips_ejtag_drscan_32(ejtag_info
, &ejtag_ctrl
);
250 LOG_DEBUG("ejtag_ctrl: 0x%8.8" PRIx32
"", ejtag_ctrl
);
251 if ((ejtag_ctrl
& EJTAG_CTRL_BRKST
) == 0) {
252 LOG_ERROR("Failed to enter Debug Mode!");
259 int mips_ejtag_exit_debug(struct mips_ejtag
*ejtag_info
)
264 /* execute our dret instruction */
265 return mips32_pracc_exec(ejtag_info
, 1, &inst
, 0, NULL
, 0, NULL
, 0);
268 int mips_ejtag_read_debug(struct mips_ejtag
*ejtag_info
, uint32_t* debug_reg
)
271 static const uint32_t code
[] = {
272 MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
273 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK
)), /* $15 = MIPS32_PRACC_STACK */
274 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK
)),
275 MIPS32_SW(1, 0, 15), /* sw $1,($15) */
276 MIPS32_SW(2, 0, 15), /* sw $2,($15) */
277 MIPS32_LUI(1, UPPER16(MIPS32_PRACC_PARAM_OUT
)), /* $1 = MIPS32_PRACC_PARAM_OUT */
278 MIPS32_ORI(1, 1, LOWER16(MIPS32_PRACC_PARAM_OUT
)),
279 MIPS32_MFC0(2, 23, 0), /* move COP0 Debug to $2 */
284 MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
287 return mips32_pracc_exec(ejtag_info
, ARRAY_SIZE(code
), code
,
288 0, NULL
, 1, debug_reg
, 1);
291 int mips_ejtag_init(struct mips_ejtag
*ejtag_info
)
293 uint32_t ejtag_version
;
296 retval
= mips_ejtag_get_impcode(ejtag_info
, &ejtag_info
->impcode
);
297 if (retval
!= ERROR_OK
)
299 LOG_DEBUG("impcode: 0x%8.8" PRIx32
"", ejtag_info
->impcode
);
301 /* get ejtag version */
302 ejtag_version
= ((ejtag_info
->impcode
>> 29) & 0x07);
304 switch (ejtag_version
) {
306 LOG_DEBUG("EJTAG: Version 1 or 2.0 Detected");
309 LOG_DEBUG("EJTAG: Version 2.5 Detected");
312 LOG_DEBUG("EJTAG: Version 2.6 Detected");
315 LOG_DEBUG("EJTAG: Version 3.1 Detected");
318 LOG_DEBUG("EJTAG: Unknown Version Detected");
321 LOG_DEBUG("EJTAG: features:%s%s%s%s%s%s%s",
322 ejtag_info
->impcode
& EJTAG_IMP_R3K
? " R3k" : " R4k",
323 ejtag_info
->impcode
& EJTAG_IMP_DINT
? " DINT" : "",
324 ejtag_info
->impcode
& (1 << 22) ? " ASID_8" : "",
325 ejtag_info
->impcode
& (1 << 21) ? " ASID_6" : "",
326 ejtag_info
->impcode
& EJTAG_IMP_MIPS16
? " MIPS16" : "",
327 ejtag_info
->impcode
& EJTAG_IMP_NODMA
? " noDMA" : " DMA",
328 ejtag_info
->impcode
& EJTAG_DCR_MIPS64
? " MIPS64" : " MIPS32");
330 if ((ejtag_info
->impcode
& EJTAG_IMP_NODMA
) == 0)
331 LOG_DEBUG("EJTAG: DMA Access Mode Support Enabled");
333 /* set initial state for ejtag control reg */
334 ejtag_info
->ejtag_ctrl
= EJTAG_CTRL_ROCC
| EJTAG_CTRL_PRACC
| EJTAG_CTRL_PROBEN
| EJTAG_CTRL_SETDEV
;
335 ejtag_info
->fast_access_save
= -1;
340 int mips_ejtag_fastdata_scan(struct mips_ejtag
*ejtag_info
, int write_t
, uint32_t *data
)
342 struct jtag_tap
*tap
;
344 tap
= ejtag_info
->tap
;
347 struct scan_field fields
[2];
349 uint8_t t
[4] = {0, 0, 0, 0};
351 /* fastdata 1-bit register */
352 fields
[0].num_bits
= 1;
353 fields
[0].out_value
= &spracc
;
354 fields
[0].in_value
= NULL
;
356 /* processor access data register 32 bit */
357 fields
[1].num_bits
= 32;
358 fields
[1].out_value
= t
;
361 fields
[1].in_value
= NULL
;
362 buf_set_u32(t
, 0, 32, *data
);
364 fields
[1].in_value
= (void *) data
;
366 jtag_add_dr_scan(tap
, 2, fields
, TAP_IDLE
);
368 if (!write_t
&& data
)
369 jtag_add_callback(mips_le_to_h_u32
,
370 (jtag_callback_data_t
) data
);