1 /***************************************************************************
2 * Copyright (C) 2008 by Spencer Oliver *
3 * spen@spen-soft.co.uk *
5 * Copyright (C) 2008 by David T.L. Wong *
7 * This program is free software; you can redistribute it and/or modify *
8 * it under the terms of the GNU General Public License as published by *
9 * the Free Software Foundation; either version 2 of the License, or *
10 * (at your option) any later version. *
12 * This program is distributed in the hope that it will be useful, *
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
15 * GNU General Public License for more details. *
17 * You should have received a copy of the GNU General Public License *
18 * along with this program; if not, write to the *
19 * Free Software Foundation, Inc., *
20 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
21 ***************************************************************************/
27 #include "mips_ejtag.h"
30 int mips_ejtag_set_instr(mips_ejtag_t *ejtag_info, int new_instr, void *delete_me_and_submit_patch)
34 tap = ejtag_info->tap;
38 if (buf_get_u32(tap->cur_instr, 0, tap->ir_length) != (uint32_t)new_instr)
44 field.num_bits = tap->ir_length;
46 buf_set_u32(field.out_value, 0, field.num_bits, new_instr);
48 field.in_value = NULL;
53 jtag_add_ir_scan(1, &field, jtag_get_end_state());
59 int mips_ejtag_get_idcode(mips_ejtag_t *ejtag_info, uint32_t *idcode)
63 jtag_set_end_state(TAP_IDLE);
65 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_IDCODE, NULL);
67 field.tap = ejtag_info->tap;
69 field.out_value = NULL;
71 field.in_value = (void*)idcode;
76 jtag_add_dr_scan(1, &field, jtag_get_end_state());
78 if (jtag_execute_queue() != ERROR_OK)
80 LOG_ERROR("register read failed");
86 int mips_ejtag_get_impcode(mips_ejtag_t *ejtag_info, uint32_t *impcode)
90 jtag_set_end_state(TAP_IDLE);
92 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_IMPCODE, NULL);
94 field.tap = ejtag_info->tap;
96 field.out_value = NULL;
98 field.in_value = (void*)impcode;
103 jtag_add_dr_scan(1, &field, jtag_get_end_state());
105 if (jtag_execute_queue() != ERROR_OK)
107 LOG_ERROR("register read failed");
113 int mips_ejtag_drscan_32(mips_ejtag_t *ejtag_info, uint32_t *data)
116 tap = ejtag_info->tap;
127 buf_set_u32(field.out_value, 0, field.num_bits, *data);
134 jtag_add_dr_scan(1, &field, jtag_get_end_state());
136 if ((retval = jtag_execute_queue()) != ERROR_OK)
138 LOG_ERROR("register read failed");
142 *data = buf_get_u32(field.in_value, 0, 32);
149 int mips_ejtag_step_enable(mips_ejtag_t *ejtag_info)
152 MIPS32_MTC0(1,31,0), /* move $1 to COP0 DeSave */
153 MIPS32_MFC0(1,23,0), /* move COP0 Debug to $1 */
154 MIPS32_ORI(1,1,0x0100), /* set SSt bit in debug reg */
155 MIPS32_MTC0(1,23,0), /* move $1 to COP0 Debug */
156 MIPS32_MFC0(1,31,0), /* move COP0 DeSave to $1 */
162 mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
163 0, NULL, 0, NULL, 1);
167 int mips_ejtag_step_disable(mips_ejtag_t *ejtag_info)
170 MIPS32_MTC0(15,31,0), /* move $15 to COP0 DeSave */
171 MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
172 MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
173 MIPS32_SW(1,0,15), /* sw $1,($15) */
174 MIPS32_SW(2,0,15), /* sw $2,($15) */
175 MIPS32_MFC0(1,23,0), /* move COP0 Debug to $1 */
176 MIPS32_LUI(2,0xFFFF), /* $2 = 0xfffffeff */
177 MIPS32_ORI(2,2,0xFEFF),
179 MIPS32_MTC0(1,23,0), /* move $1 to COP0 Debug */
182 MIPS32_MFC0(15,31,0), /* move COP0 DeSave to $15 */
188 mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
189 0, NULL, 0, NULL, 1);
194 int mips_ejtag_config_step(mips_ejtag_t *ejtag_info, int enable_step)
197 return mips_ejtag_step_enable(ejtag_info);
198 return mips_ejtag_step_disable(ejtag_info);
201 int mips_ejtag_enter_debug(mips_ejtag_t *ejtag_info)
204 jtag_set_end_state(TAP_IDLE);
205 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
207 /* set debug break bit */
208 ejtag_ctrl = ejtag_info->ejtag_ctrl | EJTAG_CTRL_JTAGBRK;
209 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
211 /* break bit will be cleared by hardware */
212 ejtag_ctrl = ejtag_info->ejtag_ctrl;
213 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
214 LOG_DEBUG("ejtag_ctrl: 0x%8.8x", ejtag_ctrl);
215 if((ejtag_ctrl & EJTAG_CTRL_BRKST) == 0)
216 LOG_DEBUG("Failed to enter Debug Mode!");
221 int mips_ejtag_exit_debug(mips_ejtag_t *ejtag_info)
226 /* execute our dret instruction */
227 mips32_pracc_exec(ejtag_info, 1, &inst, 0, NULL, 0, NULL, 0);
232 int mips_ejtag_read_debug(mips_ejtag_t *ejtag_info, uint32_t* debug_reg)
236 MIPS32_MTC0(15,31,0), /* move $15 to COP0 DeSave */
237 MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
238 MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
239 MIPS32_SW(1,0,15), /* sw $1,($15) */
240 MIPS32_SW(2,0,15), /* sw $2,($15) */
241 MIPS32_LUI(1,UPPER16(MIPS32_PRACC_PARAM_OUT)), /* $1 = MIPS32_PRACC_PARAM_OUT */
242 MIPS32_ORI(1,1,LOWER16(MIPS32_PRACC_PARAM_OUT)),
243 MIPS32_MFC0(2,23,0), /* move COP0 Debug to $2 */
247 MIPS32_MFC0(15,31,0), /* move COP0 DeSave to $15 */
253 mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
254 0, NULL, 1, debug_reg, 1);
259 int mips_ejtag_init(mips_ejtag_t *ejtag_info)
261 uint32_t ejtag_version;
263 mips_ejtag_get_impcode(ejtag_info, &ejtag_info->impcode);
264 LOG_DEBUG("impcode: 0x%8.8x", ejtag_info->impcode);
266 /* get ejtag version */
267 ejtag_version = ((ejtag_info->impcode >> 29) & 0x07);
269 switch (ejtag_version)
272 LOG_DEBUG("EJTAG: Version 1 or 2.0 Detected");
275 LOG_DEBUG("EJTAG: Version 2.5 Detected");
278 LOG_DEBUG("EJTAG: Version 2.6 Detected");
281 LOG_DEBUG("EJTAG: Version 3.1 Detected");
284 LOG_DEBUG("EJTAG: Unknown Version Detected");
287 LOG_DEBUG("EJTAG: features:%s%s%s%s%s%s%s",
288 ejtag_info->impcode & (1<<28) ? " R3k": " R4k",
289 ejtag_info->impcode & (1<<24) ? " DINT": "",
290 ejtag_info->impcode & (1<<22) ? " ASID_8": "",
291 ejtag_info->impcode & (1<<21) ? " ASID_6": "",
292 ejtag_info->impcode & (1<<16) ? " MIPS16": "",
293 ejtag_info->impcode & (1<<14) ? " noDMA": " DMA",
294 ejtag_info->impcode & (1<<0) ? " MIPS64": " MIPS32"
297 if((ejtag_info->impcode & (1<<14)) == 0)
298 LOG_DEBUG("EJTAG: DMA Access Mode Support Enabled");
300 /* set initial state for ejtag control reg */
301 ejtag_info->ejtag_ctrl = EJTAG_CTRL_ROCC | EJTAG_CTRL_PRACC | EJTAG_CTRL_PROBEN | EJTAG_CTRL_SETDEV;