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- /***************************************************************************
- * Copyright (C) 2008 by Spencer Oliver *
- * spen@spen-soft.co.uk *
- * *
- * Copyright (C) 2008 by David T.L. Wong *
- * *
- * This program is free software; you can redistribute it and/or modify *
- * it under the terms of the GNU General Public License as published by *
- * the Free Software Foundation; either version 2 of the License, or *
- * (at your option) any later version. *
- * *
- * This program is distributed in the hope that it will be useful, *
- * but WITHOUT ANY WARRANTY; without even the implied warranty of *
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
- * GNU General Public License for more details. *
- * *
- * You should have received a copy of the GNU General Public License *
- * along with this program; if not, write to the *
- * Free Software Foundation, Inc., *
- * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
- ***************************************************************************/
- #ifdef HAVE_CONFIG_H
- #include "config.h"
- #endif
-
- #include "mips32.h"
- #include "mips_ejtag.h"
-
- #include "binarybuffer.h"
- #include "log.h"
- #include "jtag.h"
-
- #include <stdlib.h>
-
- int mips_ejtag_set_instr(mips_ejtag_t *ejtag_info, int new_instr, in_handler_t handler)
- {
- jtag_tap_t *tap;
-
- tap = ejtag_info->tap;
- if (tap==NULL)
- return ERROR_FAIL;
-
- if (buf_get_u32(tap->cur_instr, 0, tap->ir_length) != new_instr)
- {
- scan_field_t field;
- u8 t[4];
-
- field.tap = tap;
- field.num_bits = tap->ir_length;
- field.out_value = t;
- buf_set_u32(field.out_value, 0, field.num_bits, new_instr);
- field.out_mask = NULL;
- field.in_value = NULL;
- field.in_check_value = NULL;
- field.in_check_mask = NULL;
- field.in_handler = handler;
- field.in_handler_priv = NULL;
- jtag_add_ir_scan(1, &field, -1);
- }
-
- return ERROR_OK;
- }
-
- int mips_ejtag_get_idcode(mips_ejtag_t *ejtag_info, u32 *idcode, in_handler_t handler)
- {
- scan_field_t field;
-
- jtag_add_end_state(TAP_IDLE);
-
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_IDCODE, NULL);
-
- field.tap = ejtag_info->tap;
- field.num_bits = 32;
- field.out_value = NULL;
- field.out_mask = NULL;
- field.in_value = (void*)idcode;
- field.in_check_value = NULL;
- field.in_check_mask = NULL;
- field.in_handler = NULL;
- field.in_handler_priv = NULL;
- jtag_add_dr_scan(1, &field, -1);
-
- if (jtag_execute_queue() != ERROR_OK)
- {
- LOG_ERROR("register read failed");
- }
-
- return ERROR_OK;
- }
-
- int mips_ejtag_get_impcode(mips_ejtag_t *ejtag_info, u32 *impcode, in_handler_t handler)
- {
- scan_field_t field;
-
- jtag_add_end_state(TAP_IDLE);
-
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_IMPCODE, NULL);
-
- field.tap = ejtag_info->tap;
- field.num_bits = 32;
- field.out_value = NULL;
- field.out_mask = NULL;
- field.in_value = (void*)impcode;
- field.in_check_value = NULL;
- field.in_check_mask = NULL;
- field.in_handler = NULL;
- field.in_handler_priv = NULL;
- jtag_add_dr_scan(1, &field, -1);
-
- if (jtag_execute_queue() != ERROR_OK)
- {
- LOG_ERROR("register read failed");
- }
-
- return ERROR_OK;
- }
-
- int mips_ejtag_drscan_32(mips_ejtag_t *ejtag_info, u32 *data)
- {
- jtag_tap_t *tap;
- tap = ejtag_info->tap;
-
- if (tap==NULL)
- return ERROR_FAIL;
- scan_field_t field;
- u8 t[4];
- int retval;
-
- field.tap = tap;
- field.num_bits = 32;
- field.out_value = t;
- buf_set_u32(field.out_value, 0, field.num_bits, *data);
- field.out_mask = NULL;
- field.in_value = (u8*)data;
- field.in_check_value = NULL;
- field.in_check_mask = NULL;
- field.in_handler = NULL;
- field.in_handler_priv = NULL;
- jtag_add_dr_scan(1, &field, -1);
-
- if ((retval = jtag_execute_queue()) != ERROR_OK)
- {
- LOG_ERROR("register read failed");
- return retval;
- }
-
- keep_alive();
-
- return ERROR_OK;
- }
-
- int mips_ejtag_step_enable(mips_ejtag_t *ejtag_info)
- {
- u32 code[] = {
- MIPS32_MTC0(1,31,0), /* move $1 to COP0 DeSave */
- MIPS32_MFC0(1,23,0), /* move COP0 Debug to $1 */
- MIPS32_ORI(1,1,0x0100), /* set SSt bit in debug reg */
- MIPS32_MTC0(1,23,0), /* move $1 to COP0 Debug */
- MIPS32_MFC0(1,31,0), /* move COP0 DeSave to $1 */
- MIPS32_NOP,
- MIPS32_B(NEG16(7)),
- MIPS32_NOP,
- };
-
- mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
- 0, NULL, 0, NULL, 1);
-
- return ERROR_OK;
- }
- int mips_ejtag_step_disable(mips_ejtag_t *ejtag_info)
- {
- u32 code[] = {
- MIPS32_MTC0(15,31,0), /* move $15 to COP0 DeSave */
- MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
- MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
- MIPS32_SW(1,0,15), /* sw $1,($15) */
- MIPS32_SW(2,0,15), /* sw $2,($15) */
- MIPS32_MFC0(1,23,0), /* move COP0 Debug to $1 */
- MIPS32_LUI(2,0xFFFF), /* $2 = 0xfffffeff */
- MIPS32_ORI(2,2,0xFEFF),
- MIPS32_AND(1,1,2),
- MIPS32_MTC0(1,23,0), /* move $1 to COP0 Debug */
- MIPS32_LW(2,0,15),
- MIPS32_LW(1,0,15),
- MIPS32_MFC0(15,31,0), /* move COP0 DeSave to $15 */
- MIPS32_NOP,
- MIPS32_B(NEG16(15)),
- MIPS32_NOP,
- };
-
- mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
- 0, NULL, 0, NULL, 1);
-
- return ERROR_OK;
- }
-
- int mips_ejtag_config_step(mips_ejtag_t *ejtag_info, int enable_step)
- {
- if (enable_step)
- return mips_ejtag_step_enable(ejtag_info);
- return mips_ejtag_step_disable(ejtag_info);
- }
-
- int mips_ejtag_enter_debug(mips_ejtag_t *ejtag_info)
- {
- u32 ejtag_ctrl;
- jtag_add_end_state(TAP_IDLE);
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
-
- /* set debug break bit */
- ejtag_ctrl = ejtag_info->ejtag_ctrl | EJTAG_CTRL_JTAGBRK;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
-
- /* break bit will be cleared by hardware */
- ejtag_ctrl = ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
- LOG_DEBUG("ejtag_ctrl: 0x%8.8x", ejtag_ctrl);
- if((ejtag_ctrl & EJTAG_CTRL_BRKST) == 0)
- LOG_DEBUG("Failed to enter Debug Mode!");
-
- return ERROR_OK;
- }
-
- int mips_ejtag_exit_debug(mips_ejtag_t *ejtag_info, int enable_interrupts)
- {
- u32 inst;
- inst = MIPS32_DRET;
-
- /* TODO : enable/disable interrrupts */
-
- /* execute our dret instruction */
- mips32_pracc_exec(ejtag_info, 1, &inst, 0, NULL, 0, NULL, 0);
-
- return ERROR_OK;
- }
-
- int mips_ejtag_read_debug(mips_ejtag_t *ejtag_info, u32* debug_reg)
- {
- /* read ejtag ECR */
- u32 code[] = {
- MIPS32_MTC0(15,31,0), /* move $15 to COP0 DeSave */
- MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
- MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
- MIPS32_SW(1,0,15), /* sw $1,($15) */
- MIPS32_SW(2,0,15), /* sw $2,($15) */
- MIPS32_LUI(1,UPPER16(MIPS32_PRACC_PARAM_OUT)), /* $1 = MIPS32_PRACC_PARAM_OUT */
- MIPS32_ORI(1,1,LOWER16(MIPS32_PRACC_PARAM_OUT)),
- MIPS32_MFC0(2,23,0), /* move COP0 Debug to $2 */
- MIPS32_SW(2,0,1),
- MIPS32_LW(2,0,15),
- MIPS32_LW(1,0,15),
- MIPS32_MFC0(15,31,0), /* move COP0 DeSave to $15 */
- MIPS32_NOP,
- MIPS32_B(NEG16(14)),
- MIPS32_NOP,
- };
-
- mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
- 0, NULL, 1, debug_reg, 1);
-
- return ERROR_OK;
- }
-
- int mips_ejtag_init(mips_ejtag_t *ejtag_info)
- {
- u32 ejtag_version;
-
- mips_ejtag_get_impcode(ejtag_info, &ejtag_info->impcode, NULL);
- LOG_DEBUG("impcode: 0x%8.8x", ejtag_info->impcode);
-
- /* get ejtag version */
- ejtag_version = ((ejtag_info->impcode >> 29) & 0x07);
-
- switch (ejtag_version)
- {
- case 0:
- LOG_DEBUG("EJTAG: Version 1 or 2.0 Detected");
- break;
- case 1:
- LOG_DEBUG("EJTAG: Version 2.5 Detected");
- break;
- case 2:
- LOG_DEBUG("EJTAG: Version 2.6 Detected");
- break;
- case 3:
- LOG_DEBUG("EJTAG: Version 3.1 Detected");
- break;
- default:
- LOG_DEBUG("EJTAG: Unknown Version Detected");
- break;
- }
- LOG_DEBUG("EJTAG: features:%s%s%s%s%s%s%s",
- ejtag_info->impcode & (1<<28) ? " R3k": " R4k",
- ejtag_info->impcode & (1<<24) ? " DINT": "",
- ejtag_info->impcode & (1<<22) ? " ASID_8": "",
- ejtag_info->impcode & (1<<21) ? " ASID_6": "",
- ejtag_info->impcode & (1<<16) ? " MIPS16": "",
- ejtag_info->impcode & (1<<14) ? " noDMA": " DMA",
- ejtag_info->impcode & (1<<0) ? " MIPS64": " MIPS32"
- );
-
- if((ejtag_info->impcode & (1<<14)) == 0)
- LOG_DEBUG("EJTAG: DMA Access Mode Support Enabled");
-
- /* set initial state for ejtag control reg */
- ejtag_info->ejtag_ctrl = EJTAG_CTRL_ROCC | EJTAG_CTRL_PRACC | EJTAG_CTRL_PROBEN | EJTAG_CTRL_SETDEV;
-
- return ERROR_OK;
- }
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