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   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007,2008,2009 Øyvind Harboe                            *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   Copyright (C) 2008 by Spencer Oliver                                  *
   9  *   spen@spen-soft.co.uk                                                  *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program; if not, write to the                         *
  23  *   Free Software Foundation, Inc.,                                       *
  24  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  25  ***************************************************************************/
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include "embeddedice.h"
  31
  32 #define ARRAY_SIZE(x)   ((int)(sizeof(x)/sizeof((x)[0])))
  33
  34 #if 0
  35 static bitfield_desc_t embeddedice_comms_ctrl_bitfield_desc[] =
  36 {
  37         {"R", 1},
  38         {"W", 1},
  39         {"reserved", 26},
  40         {"version", 4}
  41 };
  42 #endif
  43
  44 /*
  45  * From:  ARM9E-S TRM, DDI 0165, table C-4 (and similar, for other cores)
  46  */
  47 static const struct {
  48         char            *name;
  49         unsigned short  addr;
  50         unsigned short  width;
  51 } eice_regs[] = {
  52         [EICE_DBG_CTRL] = {
  53                 .name =         "debug_ctrl",
  54                 .addr =         0,
  55                 /* width is assigned based on EICE version */
  56         },
  57         [EICE_DBG_STAT] = {
  58                 .name =         "debug_status",
  59                 .addr =         1,
  60                 /* width is assigned based on EICE version */
  61         },
  62         [EICE_COMMS_CTRL] = {
  63                 .name =         "comms_ctrl",
  64                 .addr =         4,
  65                 .width =        6,
  66         },
  67         [EICE_COMMS_DATA] = {
  68                 .name =         "comms_data",
  69                 .addr =         5,
  70                 .width =        32,
  71         },
  72         [EICE_W0_ADDR_VALUE] = {
  73                 .name =         "watch_0_addr_value",
  74                 .addr =         8,
  75                 .width =        32,
  76         },
  77         [EICE_W0_ADDR_MASK] = {
  78                 .name =         "watch_0_addr_mask",
  79                 .addr =         9,
  80                 .width =        32,
  81         },
  82         [EICE_W0_DATA_VALUE ] = {
  83                 .name =         "watch_0_data_value",
  84                 .addr =         10,
  85                 .width =        32,
  86         },
  87         [EICE_W0_DATA_MASK] = {
  88                 .name =         "watch_0_data_mask",
  89                 .addr =         11,
  90                 .width =        32,
  91         },
  92         [EICE_W0_CONTROL_VALUE] = {
  93                 .name =         "watch_0_control_value",
  94                 .addr =         12,
  95                 .width =        9,
  96         },
  97         [EICE_W0_CONTROL_MASK] = {
  98                 .name =         "watch_0_control_mask",
  99                 .addr =         13,
 100                 .width =        8,
 101         },
 102         [EICE_W1_ADDR_VALUE] = {
 103                 .name =         "watch_1_addr_value",
 104                 .addr =         16,
 105                 .width =        32,
 106         },
 107         [EICE_W1_ADDR_MASK] = {
 108                 .name =         "watch_1_addr_mask",
 109                 .addr =         17,
 110                 .width =        32,
 111         },
 112         [EICE_W1_DATA_VALUE] = {
 113                 .name =         "watch_1_data_value",
 114                 .addr =         18,
 115                 .width =        32,
 116         },
 117         [EICE_W1_DATA_MASK] = {
 118                 .name =         "watch_1_data_mask",
 119                 .addr =         19,
 120                 .width =        32,
 121         },
 122         [EICE_W1_CONTROL_VALUE] = {
 123                 .name =         "watch_1_control_value",
 124                 .addr =         20,
 125                 .width =        9,
 126         },
 127         [EICE_W1_CONTROL_MASK] = {
 128                 .name =         "watch_1_control_mask",
 129                 .addr =         21,
 130                 .width =        8,
 131         },
 132         /* vector_catch isn't always present */
 133         [EICE_VEC_CATCH] = {
 134                 .name =         "vector_catch",
 135                 .addr =         2,
 136                 .width =        8,
 137         },
 138 };
 139
 140
 141 static int embeddedice_reg_arch_type = -1;
 142
 143 static int embeddedice_get_reg(reg_t *reg);
 144
 145 reg_cache_t* embeddedice_build_reg_cache(target_t *target, arm7_9_common_t *arm7_9)
 146 {
 147         int retval;
 148         reg_cache_t *reg_cache = malloc(sizeof(reg_cache_t));
 149         reg_t *reg_list = NULL;
 150         embeddedice_reg_t *arch_info = NULL;
 151         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 152         int num_regs = ARRAY_SIZE(eice_regs);
 153         int i;
 154         int eice_version = 0;
 155
 156         /* register a register arch-type for EmbeddedICE registers only once */
 157         if (embeddedice_reg_arch_type == -1)
 158                 embeddedice_reg_arch_type = register_reg_arch_type(
 159                                 embeddedice_get_reg, embeddedice_set_reg_w_exec);
 160
 161         /* vector_catch isn't always present */
 162         if (!arm7_9->has_vector_catch)
 163                 num_regs--;
 164
 165         /* the actual registers are kept in two arrays */
 166         reg_list = calloc(num_regs, sizeof(reg_t));
 167         arch_info = calloc(num_regs, sizeof(embeddedice_reg_t));
 168
 169         /* fill in values for the reg cache */
 170         reg_cache->name = "EmbeddedICE registers";
 171         reg_cache->next = NULL;
 172         reg_cache->reg_list = reg_list;
 173         reg_cache->num_regs = num_regs;
 174
 175         /* set up registers */
 176         for (i = 0; i < num_regs; i++)
 177         {
 178                 reg_list[i].name = eice_regs[i].name;
 179                 reg_list[i].size = eice_regs[i].width;
 180                 reg_list[i].dirty = 0;
 181                 reg_list[i].valid = 0;
 182                 reg_list[i].bitfield_desc = NULL;
 183                 reg_list[i].num_bitfields = 0;
 184                 reg_list[i].value = calloc(1, 4);
 185                 reg_list[i].arch_info = &arch_info[i];
 186                 reg_list[i].arch_type = embeddedice_reg_arch_type;
 187                 arch_info[i].addr = eice_regs[i].addr;
 188                 arch_info[i].jtag_info = jtag_info;
 189         }
 190
 191         /* identify EmbeddedICE version by reading DCC control register */
 192         embeddedice_read_reg(&reg_list[EICE_COMMS_CTRL]);
 193         if ((retval = jtag_execute_queue()) != ERROR_OK)
 194         {
 195                 for (i = 0; i < num_regs; i++)
 196                 {
 197                         free(reg_list[i].value);
 198                 }
 199                 free(reg_list);
 200                 free(reg_cache);
 201                 free(arch_info);
 202                 return NULL;
 203         }
 204
 205         eice_version = buf_get_u32(reg_list[EICE_COMMS_CTRL].value, 28, 4);
 206         LOG_INFO("Embedded ICE version %d", eice_version);
 207
 208         switch (eice_version)
 209         {
 210                 case 1:
 211                         /* ARM7TDMI r3, ARM7TDMI-S r3
 212                          *
 213                          * REVISIT docs say ARM7TDMI-S r4 uses version 1 but
 214                          * that it has 6-bit CTRL and 5-bit STAT... doc bug?
 215                          * ARM7TDMI r4 docs say EICE v4.
 216                          */
 217                         reg_list[EICE_DBG_CTRL].size = 3;
 218                         reg_list[EICE_DBG_STAT].size = 5;
 219                         break;
 220                 case 2:
 221                         /* ARM9TDMI */
 222                         reg_list[EICE_DBG_CTRL].size = 4;
 223                         reg_list[EICE_DBG_STAT].size = 5;
 224                         arm7_9->has_single_step = 1;
 225                         break;
 226                 case 3:
 227                         LOG_ERROR("EmbeddedICE v%d handling might be broken",
 228                                         eice_version);
 229                         reg_list[EICE_DBG_CTRL].size = 6;
 230                         reg_list[EICE_DBG_STAT].size = 5;
 231                         arm7_9->has_single_step = 1;
 232                         arm7_9->has_monitor_mode = 1;
 233                         break;
 234                 case 4:
 235                         /* ARM7TDMI r4 */
 236                         reg_list[EICE_DBG_CTRL].size = 6;
 237                         reg_list[EICE_DBG_STAT].size = 5;
 238                         arm7_9->has_monitor_mode = 1;
 239                         break;
 240                 case 5:
 241                         /* ARM9E-S rev 1 */
 242                         reg_list[EICE_DBG_CTRL].size = 6;
 243                         reg_list[EICE_DBG_STAT].size = 5;
 244                         arm7_9->has_single_step = 1;
 245                         arm7_9->has_monitor_mode = 1;
 246                         break;
 247                 case 6:
 248                         /* ARM7EJ-S, ARM9E-S rev 2, ARM9EJ-S */
 249                         reg_list[EICE_DBG_CTRL].size = 6;
 250                         reg_list[EICE_DBG_STAT].size = 10;
 251                         /* DBG_STAT has MOE bits */
 252                         arm7_9->has_monitor_mode = 1;
 253                         break;
 254                 case 7:
 255                         LOG_ERROR("EmbeddedICE v%d handling might be broken",
 256                                         eice_version);
 257                         reg_list[EICE_DBG_CTRL].size = 6;
 258                         reg_list[EICE_DBG_STAT].size = 5;
 259                         arm7_9->has_monitor_mode = 1;
 260                         break;
 261                 default:
 262                         /*
 263                          * The Feroceon implementation has the version number
 264                          * in some unusual bits.  Let feroceon.c validate it
 265                          * and do the appropriate setup itself.
 266                          */
 267                         if (strcmp(target_get_name(target), "feroceon") == 0 ||
 268                             strcmp(target_get_name(target), "dragonite") == 0)
 269                                 break;
 270                         LOG_ERROR("unknown EmbeddedICE version (comms ctrl: 0x%8.8" PRIx32 ")", buf_get_u32(reg_list[EICE_COMMS_CTRL].value, 0, 32));
 271         }
 272
 273         return reg_cache;
 274 }
 275
 276 int embeddedice_setup(target_t *target)
 277 {
 278         int retval;
 279         struct arm7_9_common_s *arm7_9 = target_to_arm7_9(target);
 280
 281         /* Explicitly disable monitor mode.  For now we only support halting
 282          * debug ... we don't know how to talk with a resident debug monitor
 283          * that manages break requests.  ARM's "Angel Debug Monitor" is one
 284          * common example of such code.
 285          */
 286         if (arm7_9->has_monitor_mode)
 287         {
 288                 reg_t *dbg_ctrl = &arm7_9->eice_cache->reg_list[EICE_DBG_CTRL];
 289
 290                 embeddedice_read_reg(dbg_ctrl);
 291                 if ((retval = jtag_execute_queue()) != ERROR_OK)
 292                         return retval;
 293                 buf_set_u32(dbg_ctrl->value, 4, 1, 0);
 294                 embeddedice_set_reg_w_exec(dbg_ctrl, dbg_ctrl->value);
 295         }
 296         return jtag_execute_queue();
 297 }
 298
 299 static int embeddedice_get_reg(reg_t *reg)
 300 {
 301         int retval;
 302         if ((retval = embeddedice_read_reg(reg)) != ERROR_OK)
 303         {
 304                 LOG_ERROR("BUG: error scheduling EmbeddedICE register read");
 305                 return retval;
 306         }
 307
 308         if ((retval = jtag_execute_queue()) != ERROR_OK)
 309         {
 310                 LOG_ERROR("register read failed");
 311                 return retval;
 312         }
 313
 314         return ERROR_OK;
 315 }
 316
 317 int embeddedice_read_reg_w_check(reg_t *reg, uint8_t* check_value, uint8_t* check_mask)
 318 {
 319         embeddedice_reg_t *ice_reg = reg->arch_info;
 320         uint8_t reg_addr = ice_reg->addr & 0x1f;
 321         scan_field_t fields[3];
 322         uint8_t field1_out[1];
 323         uint8_t field2_out[1];
 324
 325         jtag_set_end_state(TAP_IDLE);
 326         arm_jtag_scann(ice_reg->jtag_info, 0x2);
 327
 328         arm_jtag_set_instr(ice_reg->jtag_info, ice_reg->jtag_info->intest_instr, NULL);
 329
 330         fields[0].tap = ice_reg->jtag_info->tap;
 331         fields[0].num_bits = 32;
 332         fields[0].out_value = reg->value;
 333         fields[0].in_value = NULL;
 334         fields[0].check_value = NULL;
 335         fields[0].check_mask = NULL;
 336
 337         fields[1].tap = ice_reg->jtag_info->tap;
 338         fields[1].num_bits = 5;
 339         fields[1].out_value = field1_out;
 340         buf_set_u32(fields[1].out_value, 0, 5, reg_addr);
 341         fields[1].in_value = NULL;
 342         fields[1].check_value = NULL;
 343         fields[1].check_mask = NULL;
 344
 345         fields[2].tap = ice_reg->jtag_info->tap;
 346         fields[2].num_bits = 1;
 347         fields[2].out_value = field2_out;
 348         buf_set_u32(fields[2].out_value, 0, 1, 0);
 349         fields[2].in_value = NULL;
 350         fields[2].check_value = NULL;
 351         fields[2].check_mask = NULL;
 352
 353         jtag_add_dr_scan(3, fields, jtag_get_end_state());
 354
 355         fields[0].in_value = reg->value;
 356         fields[0].check_value = check_value;
 357         fields[0].check_mask = check_mask;
 358
 359         /* when reading the DCC data register, leaving the address field set to
 360          * EICE_COMMS_DATA would read the register twice
 361          * reading the control register is safe
 362          */
 363         buf_set_u32(fields[1].out_value, 0, 5, eice_regs[EICE_COMMS_CTRL].addr);
 364
 365         jtag_add_dr_scan_check(3, fields, jtag_get_end_state());
 366
 367         return ERROR_OK;
 368 }
 369
 370 /* receive <size> words of 32 bit from the DCC
 371  * we pretend the target is always going to be fast enough
 372  * (relative to the JTAG clock), so we don't need to handshake
 373  */
 374 int embeddedice_receive(arm_jtag_t *jtag_info, uint32_t *data, uint32_t size)
 375 {
 376         scan_field_t fields[3];
 377         uint8_t field1_out[1];
 378         uint8_t field2_out[1];
 379
 380         jtag_set_end_state(TAP_IDLE);
 381         arm_jtag_scann(jtag_info, 0x2);
 382         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 383
 384         fields[0].tap = jtag_info->tap;
 385         fields[0].num_bits = 32;
 386         fields[0].out_value = NULL;
 387         fields[0].in_value = NULL;
 388
 389         fields[1].tap = jtag_info->tap;
 390         fields[1].num_bits = 5;
 391         fields[1].out_value = field1_out;
 392         buf_set_u32(fields[1].out_value, 0, 5, eice_regs[EICE_COMMS_DATA].addr);
 393         fields[1].in_value = NULL;
 394
 395         fields[2].tap = jtag_info->tap;
 396         fields[2].num_bits = 1;
 397         fields[2].out_value = field2_out;
 398         buf_set_u32(fields[2].out_value, 0, 1, 0);
 399         fields[2].in_value = NULL;
 400
 401         jtag_add_dr_scan(3, fields, jtag_get_end_state());
 402
 403         while (size > 0)
 404         {
 405                 /* when reading the last item, set the register address to the DCC control reg,
 406                  * to avoid reading additional data from the DCC data reg
 407                  */
 408                 if (size == 1)
 409                         buf_set_u32(fields[1].out_value, 0, 5,
 410                                         eice_regs[EICE_COMMS_CTRL].addr);
 411
 412                 fields[0].in_value = (uint8_t *)data;
 413                 jtag_add_dr_scan(3, fields, jtag_get_end_state());
 414                 jtag_add_callback(arm_le_to_h_u32, (jtag_callback_data_t)data);
 415
 416                 data++;
 417                 size--;
 418         }
 419
 420         return jtag_execute_queue();
 421 }
 422
 423 int embeddedice_read_reg(reg_t *reg)
 424 {
 425         return embeddedice_read_reg_w_check(reg, NULL, NULL);
 426 }
 427
 428 void embeddedice_set_reg(reg_t *reg, uint32_t value)
 429 {
 430         embeddedice_write_reg(reg, value);
 431
 432         buf_set_u32(reg->value, 0, reg->size, value);
 433         reg->valid = 1;
 434         reg->dirty = 0;
 435
 436 }
 437
 438 int embeddedice_set_reg_w_exec(reg_t *reg, uint8_t *buf)
 439 {
 440         int retval;
 441         embeddedice_set_reg(reg, buf_get_u32(buf, 0, reg->size));
 442
 443         if ((retval = jtag_execute_queue()) != ERROR_OK)
 444         {
 445                 LOG_ERROR("register write failed");
 446                 return retval;
 447         }
 448         return ERROR_OK;
 449 }
 450
 451 void embeddedice_write_reg(reg_t *reg, uint32_t value)
 452 {
 453         embeddedice_reg_t *ice_reg = reg->arch_info;
 454
 455         LOG_DEBUG("%i: 0x%8.8" PRIx32 "", ice_reg->addr, value);
 456
 457         jtag_set_end_state(TAP_IDLE);
 458         arm_jtag_scann(ice_reg->jtag_info, 0x2);
 459
 460         arm_jtag_set_instr(ice_reg->jtag_info, ice_reg->jtag_info->intest_instr, NULL);
 461
 462         uint8_t reg_addr = ice_reg->addr & 0x1f;
 463         embeddedice_write_reg_inner(ice_reg->jtag_info->tap, reg_addr, value);
 464
 465 }
 466
 467 void embeddedice_store_reg(reg_t *reg)
 468 {
 469         embeddedice_write_reg(reg, buf_get_u32(reg->value, 0, reg->size));
 470 }
 471
 472 /* send <size> words of 32 bit to the DCC
 473  * we pretend the target is always going to be fast enough
 474  * (relative to the JTAG clock), so we don't need to handshake
 475  */
 476 int embeddedice_send(arm_jtag_t *jtag_info, uint32_t *data, uint32_t size)
 477 {
 478         scan_field_t fields[3];
 479         uint8_t field0_out[4];
 480         uint8_t field1_out[1];
 481         uint8_t field2_out[1];
 482
 483         jtag_set_end_state(TAP_IDLE);
 484         arm_jtag_scann(jtag_info, 0x2);
 485         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 486
 487         fields[0].tap = jtag_info->tap;
 488         fields[0].num_bits = 32;
 489         fields[0].out_value = field0_out;
 490         fields[0].in_value = NULL;
 491
 492         fields[1].tap = jtag_info->tap;
 493         fields[1].num_bits = 5;
 494         fields[1].out_value = field1_out;
 495         buf_set_u32(fields[1].out_value, 0, 5, eice_regs[EICE_COMMS_DATA].addr);
 496         fields[1].in_value = NULL;
 497
 498         fields[2].tap = jtag_info->tap;
 499         fields[2].num_bits = 1;
 500         fields[2].out_value = field2_out;
 501         buf_set_u32(fields[2].out_value, 0, 1, 1);
 502
 503         fields[2].in_value = NULL;
 504
 505         while (size > 0)
 506         {
 507                 buf_set_u32(fields[0].out_value, 0, 32, *data);
 508                 jtag_add_dr_scan(3, fields, jtag_get_end_state());
 509
 510                 data++;
 511                 size--;
 512         }
 513
 514         /* call to jtag_execute_queue() intentionally omitted */
 515         return ERROR_OK;
 516 }
 517
 518 /* wait for DCC control register R/W handshake bit to become active
 519  */
 520 int embeddedice_handshake(arm_jtag_t *jtag_info, int hsbit, uint32_t timeout)
 521 {
 522         scan_field_t fields[3];
 523         uint8_t field0_in[4];
 524         uint8_t field1_out[1];
 525         uint8_t field2_out[1];
 526         int retval;
 527         uint32_t hsact;
 528         struct timeval lap;
 529         struct timeval now;
 530
 531         if (hsbit == EICE_COMM_CTRL_WBIT)
 532                 hsact = 1;
 533         else if (hsbit == EICE_COMM_CTRL_RBIT)
 534                 hsact = 0;
 535         else
 536                 return ERROR_INVALID_ARGUMENTS;
 537
 538         jtag_set_end_state(TAP_IDLE);
 539         arm_jtag_scann(jtag_info, 0x2);
 540         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 541
 542         fields[0].tap = jtag_info->tap;
 543         fields[0].num_bits = 32;
 544         fields[0].out_value = NULL;
 545         fields[0].in_value = field0_in;
 546
 547         fields[1].tap = jtag_info->tap;
 548         fields[1].num_bits = 5;
 549         fields[1].out_value = field1_out;
 550         buf_set_u32(fields[1].out_value, 0, 5, eice_regs[EICE_COMMS_DATA].addr);
 551         fields[1].in_value = NULL;
 552
 553         fields[2].tap = jtag_info->tap;
 554         fields[2].num_bits = 1;
 555         fields[2].out_value = field2_out;
 556         buf_set_u32(fields[2].out_value, 0, 1, 0);
 557         fields[2].in_value = NULL;
 558
 559         jtag_add_dr_scan(3, fields, jtag_get_end_state());
 560         gettimeofday(&lap, NULL);
 561         do
 562         {
 563                 jtag_add_dr_scan(3, fields, jtag_get_end_state());
 564                 if ((retval = jtag_execute_queue()) != ERROR_OK)
 565                         return retval;
 566
 567                 if (buf_get_u32(field0_in, hsbit, 1) == hsact)
 568                         return ERROR_OK;
 569
 570                 gettimeofday(&now, NULL);
 571         }
 572         while ((uint32_t)((now.tv_sec-lap.tv_sec)*1000 + (now.tv_usec-lap.tv_usec)/1000) <= timeout);
 573
 574         return ERROR_TARGET_TIMEOUT;
 575 }
 576
 577 #ifndef HAVE_JTAG_MINIDRIVER_H
 578 /* this is the inner loop of the open loop DCC write of data to target */
 579 void embeddedice_write_dcc(jtag_tap_t *tap, int reg_addr, uint8_t *buffer, int little, int count)
 580 {
 581         int i;
 582         for (i = 0; i < count; i++)
 583         {
 584                 embeddedice_write_reg_inner(tap, reg_addr, fast_target_buffer_get_u32(buffer, little));
 585                 buffer += 4;
 586         }
 587 }
 588 #else
 589 /* provided by minidriver */
 590 #endif