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   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007,2008 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_DEBUG("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                                 break;
 269                         LOG_ERROR("unknown EmbeddedICE version (comms ctrl: 0x%8.8" PRIx32 ")", buf_get_u32(reg_list[EICE_COMMS_CTRL].value, 0, 32));
 270         }
 271
 272         return reg_cache;
 273 }
 274
 275 int embeddedice_setup(target_t *target)
 276 {
 277         int retval;
 278         armv4_5_common_t *armv4_5 = target->arch_info;
 279         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 280
 281         /* explicitly disable monitor mode */
 282         if (arm7_9->has_monitor_mode)
 283         {
 284                 reg_t *dbg_ctrl = &arm7_9->eice_cache->reg_list[EICE_DBG_CTRL];
 285
 286                 embeddedice_read_reg(dbg_ctrl);
 287                 if ((retval = jtag_execute_queue()) != ERROR_OK)
 288                         return retval;
 289                 buf_set_u32(dbg_ctrl->value, 4, 1, 0);
 290                 embeddedice_set_reg_w_exec(dbg_ctrl, dbg_ctrl->value);
 291         }
 292         return jtag_execute_queue();
 293 }
 294
 295 static int embeddedice_get_reg(reg_t *reg)
 296 {
 297         int retval;
 298         if ((retval = embeddedice_read_reg(reg)) != ERROR_OK)
 299         {
 300                 LOG_ERROR("BUG: error scheduling EmbeddedICE register read");
 301                 return retval;
 302         }
 303
 304         if ((retval = jtag_execute_queue()) != ERROR_OK)
 305         {
 306                 LOG_ERROR("register read failed");
 307                 return retval;
 308         }
 309
 310         return ERROR_OK;
 311 }
 312
 313 int embeddedice_read_reg_w_check(reg_t *reg, uint8_t* check_value, uint8_t* check_mask)
 314 {
 315         embeddedice_reg_t *ice_reg = reg->arch_info;
 316         uint8_t reg_addr = ice_reg->addr & 0x1f;
 317         scan_field_t fields[3];
 318         uint8_t field1_out[1];
 319         uint8_t field2_out[1];
 320
 321         jtag_set_end_state(TAP_IDLE);
 322         arm_jtag_scann(ice_reg->jtag_info, 0x2);
 323
 324         arm_jtag_set_instr(ice_reg->jtag_info, ice_reg->jtag_info->intest_instr, NULL);
 325
 326         fields[0].tap = ice_reg->jtag_info->tap;
 327         fields[0].num_bits = 32;
 328         fields[0].out_value = reg->value;
 329         fields[0].in_value = NULL;
 330         fields[0].check_value = NULL;
 331         fields[0].check_mask = NULL;
 332
 333         fields[1].tap = ice_reg->jtag_info->tap;
 334         fields[1].num_bits = 5;
 335         fields[1].out_value = field1_out;
 336         buf_set_u32(fields[1].out_value, 0, 5, reg_addr);
 337         fields[1].in_value = NULL;
 338         fields[1].check_value = NULL;
 339         fields[1].check_mask = NULL;
 340
 341         fields[2].tap = ice_reg->jtag_info->tap;
 342         fields[2].num_bits = 1;
 343         fields[2].out_value = field2_out;
 344         buf_set_u32(fields[2].out_value, 0, 1, 0);
 345         fields[2].in_value = NULL;
 346         fields[2].check_value = NULL;
 347         fields[2].check_mask = NULL;
 348
 349         jtag_add_dr_scan(3, fields, jtag_get_end_state());
 350
 351         fields[0].in_value = reg->value;
 352         fields[0].check_value = check_value;
 353         fields[0].check_mask = check_mask;
 354
 355         /* when reading the DCC data register, leaving the address field set to
 356          * EICE_COMMS_DATA would read the register twice
 357          * reading the control register is safe
 358          */
 359         buf_set_u32(fields[1].out_value, 0, 5, eice_regs[EICE_COMMS_CTRL].addr);
 360
 361         jtag_add_dr_scan_check(3, fields, jtag_get_end_state());
 362
 363         return ERROR_OK;
 364 }
 365
 366 /* receive <size> words of 32 bit from the DCC
 367  * we pretend the target is always going to be fast enough
 368  * (relative to the JTAG clock), so we don't need to handshake
 369  */
 370 int embeddedice_receive(arm_jtag_t *jtag_info, uint32_t *data, uint32_t size)
 371 {
 372         scan_field_t fields[3];
 373         uint8_t field1_out[1];
 374         uint8_t field2_out[1];
 375
 376         jtag_set_end_state(TAP_IDLE);
 377         arm_jtag_scann(jtag_info, 0x2);
 378         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 379
 380         fields[0].tap = jtag_info->tap;
 381         fields[0].num_bits = 32;
 382         fields[0].out_value = NULL;
 383         fields[0].in_value = NULL;
 384
 385         fields[1].tap = jtag_info->tap;
 386         fields[1].num_bits = 5;
 387         fields[1].out_value = field1_out;
 388         buf_set_u32(fields[1].out_value, 0, 5, eice_regs[EICE_COMMS_DATA].addr);
 389         fields[1].in_value = NULL;
 390
 391         fields[2].tap = jtag_info->tap;
 392         fields[2].num_bits = 1;
 393         fields[2].out_value = field2_out;
 394         buf_set_u32(fields[2].out_value, 0, 1, 0);
 395         fields[2].in_value = NULL;
 396
 397         jtag_add_dr_scan(3, fields, jtag_get_end_state());
 398
 399         while (size > 0)
 400         {
 401                 /* when reading the last item, set the register address to the DCC control reg,
 402                  * to avoid reading additional data from the DCC data reg
 403                  */
 404                 if (size == 1)
 405                         buf_set_u32(fields[1].out_value, 0, 5,
 406                                         eice_regs[EICE_COMMS_CTRL].addr);
 407
 408                 fields[0].in_value = (uint8_t *)data;
 409                 jtag_add_dr_scan(3, fields, jtag_get_end_state());
 410                 jtag_add_callback(arm_le_to_h_u32, (jtag_callback_data_t)data);
 411
 412                 data++;
 413                 size--;
 414         }
 415
 416         return jtag_execute_queue();
 417 }
 418
 419 int embeddedice_read_reg(reg_t *reg)
 420 {
 421         return embeddedice_read_reg_w_check(reg, NULL, NULL);
 422 }
 423
 424 void embeddedice_set_reg(reg_t *reg, uint32_t value)
 425 {
 426         embeddedice_write_reg(reg, value);
 427
 428         buf_set_u32(reg->value, 0, reg->size, value);
 429         reg->valid = 1;
 430         reg->dirty = 0;
 431
 432 }
 433
 434 int embeddedice_set_reg_w_exec(reg_t *reg, uint8_t *buf)
 435 {
 436         int retval;
 437         embeddedice_set_reg(reg, buf_get_u32(buf, 0, reg->size));
 438
 439         if ((retval = jtag_execute_queue()) != ERROR_OK)
 440         {
 441                 LOG_ERROR("register write failed");
 442                 return retval;
 443         }
 444         return ERROR_OK;
 445 }
 446
 447 void embeddedice_write_reg(reg_t *reg, uint32_t value)
 448 {
 449         embeddedice_reg_t *ice_reg = reg->arch_info;
 450
 451         LOG_DEBUG("%i: 0x%8.8" PRIx32 "", ice_reg->addr, value);
 452
 453         jtag_set_end_state(TAP_IDLE);
 454         arm_jtag_scann(ice_reg->jtag_info, 0x2);
 455
 456         arm_jtag_set_instr(ice_reg->jtag_info, ice_reg->jtag_info->intest_instr, NULL);
 457
 458         uint8_t reg_addr = ice_reg->addr & 0x1f;
 459         embeddedice_write_reg_inner(ice_reg->jtag_info->tap, reg_addr, value);
 460
 461 }
 462
 463 void embeddedice_store_reg(reg_t *reg)
 464 {
 465         embeddedice_write_reg(reg, buf_get_u32(reg->value, 0, reg->size));
 466 }
 467
 468 /* send <size> words of 32 bit to the DCC
 469  * we pretend the target is always going to be fast enough
 470  * (relative to the JTAG clock), so we don't need to handshake
 471  */
 472 int embeddedice_send(arm_jtag_t *jtag_info, uint32_t *data, uint32_t size)
 473 {
 474         scan_field_t fields[3];
 475         uint8_t field0_out[4];
 476         uint8_t field1_out[1];
 477         uint8_t field2_out[1];
 478
 479         jtag_set_end_state(TAP_IDLE);
 480         arm_jtag_scann(jtag_info, 0x2);
 481         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 482
 483         fields[0].tap = jtag_info->tap;
 484         fields[0].num_bits = 32;
 485         fields[0].out_value = field0_out;
 486         fields[0].in_value = NULL;
 487
 488         fields[1].tap = jtag_info->tap;
 489         fields[1].num_bits = 5;
 490         fields[1].out_value = field1_out;
 491         buf_set_u32(fields[1].out_value, 0, 5, eice_regs[EICE_COMMS_DATA].addr);
 492         fields[1].in_value = NULL;
 493
 494         fields[2].tap = jtag_info->tap;
 495         fields[2].num_bits = 1;
 496         fields[2].out_value = field2_out;
 497         buf_set_u32(fields[2].out_value, 0, 1, 1);
 498
 499         fields[2].in_value = NULL;
 500
 501         while (size > 0)
 502         {
 503                 buf_set_u32(fields[0].out_value, 0, 32, *data);
 504                 jtag_add_dr_scan(3, fields, jtag_get_end_state());
 505
 506                 data++;
 507                 size--;
 508         }
 509
 510         /* call to jtag_execute_queue() intentionally omitted */
 511         return ERROR_OK;
 512 }
 513
 514 /* wait for DCC control register R/W handshake bit to become active
 515  */
 516 int embeddedice_handshake(arm_jtag_t *jtag_info, int hsbit, uint32_t timeout)
 517 {
 518         scan_field_t fields[3];
 519         uint8_t field0_in[4];
 520         uint8_t field1_out[1];
 521         uint8_t field2_out[1];
 522         int retval;
 523         uint32_t hsact;
 524         struct timeval lap;
 525         struct timeval now;
 526
 527         if (hsbit == EICE_COMM_CTRL_WBIT)
 528                 hsact = 1;
 529         else if (hsbit == EICE_COMM_CTRL_RBIT)
 530                 hsact = 0;
 531         else
 532                 return ERROR_INVALID_ARGUMENTS;
 533
 534         jtag_set_end_state(TAP_IDLE);
 535         arm_jtag_scann(jtag_info, 0x2);
 536         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 537
 538         fields[0].tap = jtag_info->tap;
 539         fields[0].num_bits = 32;
 540         fields[0].out_value = NULL;
 541         fields[0].in_value = field0_in;
 542
 543         fields[1].tap = jtag_info->tap;
 544         fields[1].num_bits = 5;
 545         fields[1].out_value = field1_out;
 546         buf_set_u32(fields[1].out_value, 0, 5, eice_regs[EICE_COMMS_DATA].addr);
 547         fields[1].in_value = NULL;
 548
 549         fields[2].tap = jtag_info->tap;
 550         fields[2].num_bits = 1;
 551         fields[2].out_value = field2_out;
 552         buf_set_u32(fields[2].out_value, 0, 1, 0);
 553         fields[2].in_value = NULL;
 554
 555         jtag_add_dr_scan(3, fields, jtag_get_end_state());
 556         gettimeofday(&lap, NULL);
 557         do
 558         {
 559                 jtag_add_dr_scan(3, fields, jtag_get_end_state());
 560                 if ((retval = jtag_execute_queue()) != ERROR_OK)
 561                         return retval;
 562
 563                 if (buf_get_u32(field0_in, hsbit, 1) == hsact)
 564                         return ERROR_OK;
 565
 566                 gettimeofday(&now, NULL);
 567         }
 568         while ((uint32_t)((now.tv_sec-lap.tv_sec)*1000 + (now.tv_usec-lap.tv_usec)/1000) <= timeout);
 569
 570         return ERROR_TARGET_TIMEOUT;
 571 }
 572
 573 #ifndef HAVE_JTAG_MINIDRIVER_H
 574 /* this is the inner loop of the open loop DCC write of data to target */
 575 void embeddedice_write_dcc(jtag_tap_t *tap, int reg_addr, uint8_t *buffer, int little, int count)
 576 {
 577         int i;
 578         for (i = 0; i < count; i++)
 579         {
 580                 embeddedice_write_reg_inner(tap, reg_addr, fast_target_buffer_get_u32(buffer, little));
 581                 buffer += 4;
 582         }
 583 }
 584 #else
 585 /* provided by minidriver */
 586 #endif