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) != (u32)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, TAP_INVALID);
59 int mips_ejtag_get_idcode(mips_ejtag_t *ejtag_info, u32 *idcode)
63 jtag_add_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, TAP_INVALID);
78 if (jtag_execute_queue() != ERROR_OK)
80 LOG_ERROR("register read failed");
86 int mips_ejtag_get_impcode(mips_ejtag_t *ejtag_info, u32 *impcode)
90 jtag_add_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, TAP_INVALID);
105 if (jtag_execute_queue() != ERROR_OK)
107 LOG_ERROR("register read failed");
113 int mips_ejtag_drscan_32(mips_ejtag_t *ejtag_info, u32 *data)
116 tap = ejtag_info->tap;
127 buf_set_u32(field.out_value, 0, field.num_bits, *data);
129 field.in_value = (u8*)data;
134 jtag_add_dr_scan(1, &field, TAP_INVALID);
136 if ((retval = jtag_execute_queue()) != ERROR_OK)
138 LOG_ERROR("register read failed");
147 int mips_ejtag_step_enable(mips_ejtag_t *ejtag_info)
150 MIPS32_MTC0(1,31,0), /* move $1 to COP0 DeSave */
151 MIPS32_MFC0(1,23,0), /* move COP0 Debug to $1 */
152 MIPS32_ORI(1,1,0x0100), /* set SSt bit in debug reg */
153 MIPS32_MTC0(1,23,0), /* move $1 to COP0 Debug */
154 MIPS32_MFC0(1,31,0), /* move COP0 DeSave to $1 */
160 mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
161 0, NULL, 0, NULL, 1);
165 int mips_ejtag_step_disable(mips_ejtag_t *ejtag_info)
168 MIPS32_MTC0(15,31,0), /* move $15 to COP0 DeSave */
169 MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
170 MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
171 MIPS32_SW(1,0,15), /* sw $1,($15) */
172 MIPS32_SW(2,0,15), /* sw $2,($15) */
173 MIPS32_MFC0(1,23,0), /* move COP0 Debug to $1 */
174 MIPS32_LUI(2,0xFFFF), /* $2 = 0xfffffeff */
175 MIPS32_ORI(2,2,0xFEFF),
177 MIPS32_MTC0(1,23,0), /* move $1 to COP0 Debug */
180 MIPS32_MFC0(15,31,0), /* move COP0 DeSave to $15 */
186 mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
187 0, NULL, 0, NULL, 1);
192 int mips_ejtag_config_step(mips_ejtag_t *ejtag_info, int enable_step)
195 return mips_ejtag_step_enable(ejtag_info);
196 return mips_ejtag_step_disable(ejtag_info);
199 int mips_ejtag_enter_debug(mips_ejtag_t *ejtag_info)
202 jtag_add_end_state(TAP_IDLE);
203 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
205 /* set debug break bit */
206 ejtag_ctrl = ejtag_info->ejtag_ctrl | EJTAG_CTRL_JTAGBRK;
207 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
209 /* break bit will be cleared by hardware */
210 ejtag_ctrl = ejtag_info->ejtag_ctrl;
211 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
212 LOG_DEBUG("ejtag_ctrl: 0x%8.8x", ejtag_ctrl);
213 if((ejtag_ctrl & EJTAG_CTRL_BRKST) == 0)
214 LOG_DEBUG("Failed to enter Debug Mode!");
219 int mips_ejtag_exit_debug(mips_ejtag_t *ejtag_info)
224 /* execute our dret instruction */
225 mips32_pracc_exec(ejtag_info, 1, &inst, 0, NULL, 0, NULL, 0);
230 int mips_ejtag_read_debug(mips_ejtag_t *ejtag_info, u32* debug_reg)
234 MIPS32_MTC0(15,31,0), /* move $15 to COP0 DeSave */
235 MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
236 MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
237 MIPS32_SW(1,0,15), /* sw $1,($15) */
238 MIPS32_SW(2,0,15), /* sw $2,($15) */
239 MIPS32_LUI(1,UPPER16(MIPS32_PRACC_PARAM_OUT)), /* $1 = MIPS32_PRACC_PARAM_OUT */
240 MIPS32_ORI(1,1,LOWER16(MIPS32_PRACC_PARAM_OUT)),
241 MIPS32_MFC0(2,23,0), /* move COP0 Debug to $2 */
245 MIPS32_MFC0(15,31,0), /* move COP0 DeSave to $15 */
251 mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
252 0, NULL, 1, debug_reg, 1);
257 int mips_ejtag_init(mips_ejtag_t *ejtag_info)
261 mips_ejtag_get_impcode(ejtag_info, &ejtag_info->impcode);
262 LOG_DEBUG("impcode: 0x%8.8x", ejtag_info->impcode);
264 /* get ejtag version */
265 ejtag_version = ((ejtag_info->impcode >> 29) & 0x07);
267 switch (ejtag_version)
270 LOG_DEBUG("EJTAG: Version 1 or 2.0 Detected");
273 LOG_DEBUG("EJTAG: Version 2.5 Detected");
276 LOG_DEBUG("EJTAG: Version 2.6 Detected");
279 LOG_DEBUG("EJTAG: Version 3.1 Detected");
282 LOG_DEBUG("EJTAG: Unknown Version Detected");
285 LOG_DEBUG("EJTAG: features:%s%s%s%s%s%s%s",
286 ejtag_info->impcode & (1<<28) ? " R3k": " R4k",
287 ejtag_info->impcode & (1<<24) ? " DINT": "",
288 ejtag_info->impcode & (1<<22) ? " ASID_8": "",
289 ejtag_info->impcode & (1<<21) ? " ASID_6": "",
290 ejtag_info->impcode & (1<<16) ? " MIPS16": "",
291 ejtag_info->impcode & (1<<14) ? " noDMA": " DMA",
292 ejtag_info->impcode & (1<<0) ? " MIPS64": " MIPS32"
295 if((ejtag_info->impcode & (1<<14)) == 0)
296 LOG_DEBUG("EJTAG: DMA Access Mode Support Enabled");
298 /* set initial state for ejtag control reg */
299 ejtag_info->ejtag_ctrl = EJTAG_CTRL_ROCC | EJTAG_CTRL_PRACC | EJTAG_CTRL_PROBEN | EJTAG_CTRL_SETDEV;