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- /***************************************************************************
- * Copyright (C) 2008 by Spencer Oliver *
- * spen@spen-soft.co.uk *
- * *
- * Copyright (C) 2008 by David T.L. Wong *
- * *
- * Copyright (C) 2009 by David N. Claffey <dnclaffey@gmail.com> *
- * *
- * 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"
-
- void mips_ejtag_set_instr(struct mips_ejtag *ejtag_info, int new_instr)
- {
- struct jtag_tap *tap;
-
- tap = ejtag_info->tap;
- assert(tap != NULL);
-
- if (buf_get_u32(tap->cur_instr, 0, tap->ir_length) != (uint32_t)new_instr)
- {
- struct scan_field field;
- uint8_t t[4];
-
- field.num_bits = tap->ir_length;
- field.out_value = t;
- buf_set_u32(t, 0, field.num_bits, new_instr);
- field.in_value = NULL;
-
- jtag_add_ir_scan(tap, &field, TAP_IDLE);
- }
- }
-
- int mips_ejtag_get_idcode(struct mips_ejtag *ejtag_info, uint32_t *idcode)
- {
- struct scan_field field;
- uint8_t r[4];
-
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_IDCODE);
-
- field.num_bits = 32;
- field.out_value = NULL;
- field.in_value = r;
-
- jtag_add_dr_scan(ejtag_info->tap, 1, &field, TAP_IDLE);
-
- int retval;
- if ((retval = jtag_execute_queue()) != ERROR_OK)
- {
- LOG_ERROR("register read failed");
- return retval;
- }
-
- *idcode = buf_get_u32(field.in_value, 0, 32);
-
- return ERROR_OK;
- }
-
- static int mips_ejtag_get_impcode(struct mips_ejtag *ejtag_info, uint32_t *impcode)
- {
- struct scan_field field;
- uint8_t r[4];
-
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_IMPCODE);
-
- field.num_bits = 32;
- field.out_value = NULL;
- field.in_value = r;
-
- jtag_add_dr_scan(ejtag_info->tap, 1, &field, TAP_IDLE);
-
- int retval;
- if ((retval = jtag_execute_queue()) != ERROR_OK)
- {
- LOG_ERROR("register read failed");
- return retval;
- }
-
- *impcode = buf_get_u32(field.in_value, 0, 32);
-
- return ERROR_OK;
- }
-
- int mips_ejtag_drscan_32(struct mips_ejtag *ejtag_info, uint32_t *data)
- {
- struct jtag_tap *tap;
- tap = ejtag_info->tap;
- assert(tap != NULL);
-
- struct scan_field field;
- uint8_t t[4], r[4];
- int retval;
-
- field.num_bits = 32;
- field.out_value = t;
- buf_set_u32(t, 0, field.num_bits, *data);
- field.in_value = r;
-
- jtag_add_dr_scan(tap, 1, &field, TAP_IDLE);
-
- if ((retval = jtag_execute_queue()) != ERROR_OK)
- {
- LOG_ERROR("register read failed");
- return retval;
- }
-
- *data = buf_get_u32(field.in_value, 0, 32);
-
- keep_alive();
-
- return ERROR_OK;
- }
-
- void mips_ejtag_drscan_32_out(struct mips_ejtag *ejtag_info, uint32_t data)
- {
- uint8_t t[4];
- struct jtag_tap *tap;
- tap = ejtag_info->tap;
- assert(tap != NULL);
-
- struct scan_field field;
-
- field.num_bits = 32;
- field.out_value = t;
- buf_set_u32(t, 0, field.num_bits, data);
-
- field.in_value = NULL;
-
- jtag_add_dr_scan(tap, 1, &field, TAP_IDLE);
- }
-
- int mips_ejtag_drscan_8(struct mips_ejtag *ejtag_info, uint32_t *data)
- {
- struct jtag_tap *tap;
- tap = ejtag_info->tap;
- assert(tap != NULL);
-
- struct scan_field field;
- uint8_t t[4] = {0, 0, 0, 0}, r[4];
- int retval;
-
- field.num_bits = 8;
- field.out_value = t;
- buf_set_u32(t, 0, field.num_bits, *data);
- field.in_value = r;
-
- jtag_add_dr_scan(tap, 1, &field, TAP_IDLE);
-
- if ((retval = jtag_execute_queue()) != ERROR_OK)
- {
- LOG_ERROR("register read failed");
- return retval;
- }
-
- *data = buf_get_u32(field.in_value, 0, 32);
-
- return ERROR_OK;
- }
-
- void mips_ejtag_drscan_8_out(struct mips_ejtag *ejtag_info, uint8_t data)
- {
- struct jtag_tap *tap;
- tap = ejtag_info->tap;
- assert(tap != NULL);
-
- struct scan_field field;
-
- field.num_bits = 8;
- field.out_value = &data;
- field.in_value = NULL;
-
- jtag_add_dr_scan(tap, 1, &field, TAP_IDLE);
- }
-
- static int mips_ejtag_step_enable(struct mips_ejtag *ejtag_info)
- {
- static const uint32_t 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_B(NEG16(5)),
- MIPS32_MFC0(1,31,0), /* move COP0 DeSave to $1 */
- };
-
- return mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
- 0, NULL, 0, NULL, 1);
- }
-
- static int mips_ejtag_step_disable(struct mips_ejtag *ejtag_info)
- {
- static const uint32_t 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_B(NEG16(13)),
- MIPS32_MFC0(15,31,0), /* move COP0 DeSave to $15 */
- };
-
- return mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
- 0, NULL, 0, NULL, 1);
- }
-
- int mips_ejtag_config_step(struct mips_ejtag *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(struct mips_ejtag *ejtag_info)
- {
- uint32_t ejtag_ctrl;
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
-
- /* 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%8.8" PRIx32 "", ejtag_ctrl);
- if ((ejtag_ctrl & EJTAG_CTRL_BRKST) == 0)
- {
- LOG_ERROR("Failed to enter Debug Mode!");
- return ERROR_FAIL;
- }
-
- return ERROR_OK;
- }
-
- int mips_ejtag_exit_debug(struct mips_ejtag *ejtag_info)
- {
- uint32_t inst;
- inst = MIPS32_DRET;
-
- /* execute our dret instruction */
- return mips32_pracc_exec(ejtag_info, 1, &inst, 0, NULL, 0, NULL, 0);
- }
-
- int mips_ejtag_read_debug(struct mips_ejtag *ejtag_info, uint32_t* debug_reg)
- {
- /* read ejtag ECR */
- static const uint32_t 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_B(NEG16(12)),
- MIPS32_MFC0(15,31,0), /* move COP0 DeSave to $15 */
- };
-
- return mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
- 0, NULL, 1, debug_reg, 1);
- }
-
- int mips_ejtag_init(struct mips_ejtag *ejtag_info)
- {
- uint32_t ejtag_version;
- int retval;
-
- retval = mips_ejtag_get_impcode(ejtag_info, &ejtag_info->impcode);
- if (retval != ERROR_OK)
- return retval;
- LOG_DEBUG("impcode: 0x%8.8" PRIx32 "", 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 & EJTAG_IMP_R3K ? " R3k" : " R4k",
- ejtag_info->impcode & EJTAG_IMP_DINT ? " DINT" : "",
- ejtag_info->impcode & (1 << 22) ? " ASID_8" : "",
- ejtag_info->impcode & (1 << 21) ? " ASID_6" : "",
- ejtag_info->impcode & EJTAG_IMP_MIPS16 ? " MIPS16" : "",
- ejtag_info->impcode & EJTAG_IMP_NODMA ? " noDMA" : " DMA",
- ejtag_info->impcode & EJTAG_DCR_MIPS64 ? " MIPS64" : " MIPS32");
-
- if ((ejtag_info->impcode & EJTAG_IMP_NODMA) == 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;
- ejtag_info->fast_access_save = -1;
-
- return ERROR_OK;
- }
-
- int mips_ejtag_fastdata_scan(struct mips_ejtag *ejtag_info, int write_t, uint32_t *data)
- {
- struct jtag_tap *tap;
-
- tap = ejtag_info->tap;
- assert(tap != NULL);
-
- struct scan_field fields[2];
- uint8_t spracc = 0;
- uint8_t t[4] = {0, 0, 0, 0};
-
- /* fastdata 1-bit register */
- fields[0].num_bits = 1;
- fields[0].out_value = &spracc;
- fields[0].in_value = NULL;
-
- /* processor access data register 32 bit */
- fields[1].num_bits = 32;
- fields[1].out_value = t;
-
- if (write_t)
- {
- fields[1].in_value = NULL;
- buf_set_u32(t, 0, 32, *data);
- }
- else
- {
- fields[1].in_value = (void *) data;
- }
-
- jtag_add_dr_scan(tap, 2, fields, TAP_IDLE);
-
- if ( (!write_t) && (data) )
- jtag_add_callback(mips_le_to_h_u32,
- (jtag_callback_data_t) data);
-
- keep_alive();
-
- return ERROR_OK;
- }
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