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   1 /***************************************************************************
   2  *   Copyright (C) 2009 by Simon Qian <SimonQian@SimonQian.com>            *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  18  ***************************************************************************/
  19
  20 /* Versaloon is a programming tool for multiple MCUs.
  21  * OpenOCD and MSP430 supports are distributed under GPLv2.
  22  * You can find it at http://www.SimonQian.com/en/Versaloon.
  23  */
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include "replacements.h"
  30
  31 #include "jtag.h"
  32
  33 #include <usb.h>
  34 #include <string.h>
  35
  36 #include "log.h"
  37
  38 //#define _VSLLINK_IN_DEBUG_MODE_
  39
  40 /* enable this to view USB communication
  41  */
  42 #if 0
  43 #define _DEBUG_USB_COMMS_
  44 #endif
  45
  46 #ifdef _DEBUG_JTAG_IO_
  47 #define DEBUG_JTAG_IO(expr ...)         LOG_DEBUG(expr)
  48 #else
  49 #define DEBUG_JTAG_IO(expr ...)
  50 #endif
  51
  52 static u16 vsllink_vid;
  53 static u16 vsllink_pid;
  54 static u8 vsllink_bulkout;
  55 static u8 vsllink_bulkin;
  56
  57 #define VSLLINK_USB_TIMEOUT                     10000
  58
  59 static int VSLLINK_BufferSize = 1024;
  60
  61 /* Global USB buffers */
  62 static int vsllink_usb_out_buffer_idx;
  63 static int vsllink_usb_in_want_length;
  64 static u8* vsllink_usb_in_buffer = NULL;
  65 static u8* vsllink_usb_out_buffer = NULL;
  66
  67 /* Constants for VSLLink command */
  68 #define VSLLINK_CMD_CONN                        0x80
  69 #define VSLLINK_CMD_DISCONN                     0x81
  70 #define VSLLINK_CMD_SET_SPEED           0x82
  71 #define VSLLINK_CMD_SET_PORT            0x90
  72 #define VSLLINK_CMD_GET_PORT            0x91
  73 #define VSLLINK_CMD_SET_PORTDIR         0x92
  74 #define VSLLINK_CMD_HW_JTAGSEQCMD       0xA0
  75 #define VSLLINK_CMD_HW_JTAGHLCMD        0xA1
  76 #define VSLLINK_CMD_HW_SWDCMD           0xA2
  77
  78 #define VSLLINK_CMDJTAGSEQ_TMSBYTE      0x00
  79 #define VSLLINK_CMDJTAGSEQ_TMSCLOCK     0x40
  80 #define VSLLINK_CMDJTAGSEQ_SCAN         0x80
  81
  82 #define VSLLINK_CMDJTAGSEQ_CMDMSK       0xC0
  83 #define VSLLINK_CMDJTAGSEQ_LENMSK       0x3F
  84
  85 #define JTAG_PINMSK_SRST                        (1 << 0)
  86 #define JTAG_PINMSK_TRST                        (1 << 1)
  87 #define JTAG_PINMSK_USR1                        (1 << 2)
  88 #define JTAG_PINMSK_USR2                        (1 << 3)
  89 #define JTAG_PINMSK_TCK                         (1 << 4)
  90 #define JTAG_PINMSK_TMS                         (1 << 5)
  91 #define JTAG_PINMSK_TDI                         (1 << 6)
  92 #define JTAG_PINMSK_TDO                         (1 << 7)
  93
  94
  95 #define VSLLINK_TAP_MOVE(from, to)      VSLLINK_tap_move[tap_move_ndx(from)][tap_move_ndx(to)]
  96
  97 /* VSLLINK_tap_move[i][j]: tap movement command to go from state i to state j
  98  * 0: Test-Logic-Reset
  99  * 1: Run-Test/Idle
 100  * 2: Shift-DR
 101  * 3: Pause-DR
 102  * 4: Shift-IR
 103  * 5: Pause-IR
 104  *
 105  * SD->SD and SI->SI have to be caught in interface specific code
 106  */
 107 static u8 VSLLINK_tap_move[6][6] =
 108 {
 109 /*        TLR   RTI   SD    PD    SI    PI             */
 110         {0xff, 0x7f, 0x2f, 0x0a, 0x37, 0x16},   /* TLR */
 111         {0xff, 0x00, 0x45, 0x05, 0x4b, 0x0b},   /* RTI */
 112         {0xff, 0x61, 0x00, 0x01, 0x0f, 0x2f},   /* SD  */
 113         {0xff, 0x60, 0x40, 0x5c, 0x3c, 0x5e},   /* PD  */
 114         {0xff, 0x61, 0x07, 0x17, 0x00, 0x01},   /* SI  */
 115         {0xff, 0x60, 0x38, 0x5c, 0x40, 0x5e}    /* PI  */
 116 };
 117
 118 typedef struct insert_insignificant_operation
 119 {
 120         unsigned char insert_value;
 121         unsigned char insert_position;
 122 }insert_insignificant_operation_t;
 123
 124 static insert_insignificant_operation_t VSLLINK_TAP_MOVE_INSERT_INSIGNIFICANT[6][6] =
 125 {
 126 /*       stuff  offset   */
 127         {/*     TLR     */
 128         {1,             0,},    /* TLR */
 129         {1,             0,},    /* RTI */
 130         {1,             0,},    /* SD  */
 131         {1,             0,},    /* PD  */
 132         {1,             0,},    /* SI  */
 133         {1,             0,}},   /* PI  */
 134         {/*     RTI     */
 135         {1,             0,},    /* TLR */
 136         {0,             0,},    /* RTI */
 137         {0,             4,},    /* SD  */
 138         {0,             7,},    /* PD  */
 139         {0,             5,},    /* SI  */
 140         {0,             7,}},   /* PI  */
 141         {/*     SD      */
 142         {0,             0,},    /* TLR */
 143         {0,             0,},    /* RTI */
 144         {0,             0,},    /* SD  */
 145         {0,             0,},    /* PD  */
 146         {0,             0,},    /* SI  */
 147         {0,             0,}},   /* PI  */
 148         {/*     PD      */
 149         {0,             0,},    /* TLR */
 150         {0,             0,},    /* RTI */
 151         {0,             0,},    /* SD  */
 152         {0,             0,},    /* PD  */
 153         {0,             0,},    /* SI  */
 154         {0,             0,}},   /* PI  */
 155         {/*     SI      */
 156         {0,             0,},    /* TLR */
 157         {0,             0,},    /* RTI */
 158         {0,             0,},    /* SD  */
 159         {0,             0,},    /* PD  */
 160         {0,             0,},    /* SI  */
 161         {0,             0,}},   /* PI  */
 162         {/*     PI      */
 163         {0,             0,},    /* TLR */
 164         {0,             0,},    /* RTI */
 165         {0,             0,},    /* SD  */
 166         {0,             0,},    /* PD  */
 167         {0,             0,},    /* SI  */
 168         {0,             0,}},   /* PI  */
 169 };
 170
 171 static u8 VSLLINK_BIT_MSK[8] =
 172 {
 173         0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f
 174 };
 175
 176 typedef struct
 177 {
 178         int length; /* Number of bits to read */
 179         int offset;
 180         scan_command_t *command; /* Corresponding scan command */
 181         u8 *buffer;
 182 } pending_scan_result_t;
 183
 184 #define MAX_PENDING_SCAN_RESULTS 256
 185
 186 static int pending_scan_results_length;
 187 static pending_scan_result_t pending_scan_results_buffer[MAX_PENDING_SCAN_RESULTS];
 188
 189 /* External interface functions */
 190 static int vsllink_execute_queue(void);
 191 static int vsllink_speed(int speed);
 192 static int vsllink_khz(int khz, int *jtag_speed);
 193 static int vsllink_speed_div(int jtag_speed, int *khz);
 194 static int vsllink_register_commands(struct command_context_s *cmd_ctx);
 195 static int vsllink_init(void);
 196 static int vsllink_quit(void);
 197
 198 /* CLI command handler functions */
 199 static int vsllink_handle_usb_vid_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 200 static int vsllink_handle_usb_pid_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 201 static int vsllink_handle_usb_bulkin_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 202 static int vsllink_handle_usb_bulkout_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 203
 204 /* Queue command functions */
 205 static void vsllink_end_state(tap_state_t state);
 206 static void vsllink_state_move(void);
 207 static void vsllink_path_move(int num_states, tap_state_t *path);
 208 static void vsllink_runtest(int num_cycles);
 209 static void vsllink_stableclocks(int num_cycles, int tms);
 210 static void vsllink_scan(int ir_scan, enum scan_type type, u8 *buffer, int scan_size, scan_command_t *command);
 211 static void vsllink_reset(int trst, int srst);
 212 static void vsllink_simple_command(u8 command);
 213
 214 /* VSLLink tap buffer functions */
 215 static void vsllink_tap_init(void);
 216 static int vsllink_tap_execute(void);
 217 static void vsllink_tap_ensure_space(int scans, int bytes);
 218 static void vsllink_tap_append_scan(int length, u8 *buffer, scan_command_t *command, int offset);
 219
 220 /* VSLLink lowlevel functions */
 221 typedef struct vsllink_jtag
 222 {
 223         struct usb_dev_handle* usb_handle;
 224 } vsllink_jtag_t;
 225
 226 static vsllink_jtag_t *vsllink_usb_open(void);
 227 static void vsllink_usb_close(vsllink_jtag_t *vsllink_jtag);
 228 static int vsllink_usb_message(vsllink_jtag_t *vsllink_jtag, int out_length, int in_length);
 229 static int vsllink_usb_write(vsllink_jtag_t *vsllink_jtag, int out_length);
 230 static int vsllink_usb_read(vsllink_jtag_t *vsllink_jtag);
 231
 232 #ifdef _DEBUG_USB_COMMS_
 233 static void vsllink_debug_buffer(u8 *buffer, int length);
 234 #endif
 235
 236 static int vsllink_tms_data_len = 0;
 237 static u8* vsllink_tms_cmd_pos;
 238
 239 static vsllink_jtag_t* vsllink_jtag_handle;
 240
 241 /***************************************************************************/
 242 /* External interface implementation */
 243
 244 jtag_interface_t vsllink_interface =
 245 {
 246         .name = "vsllink",
 247         .execute_queue = vsllink_execute_queue,
 248         .speed = vsllink_speed,
 249         .khz = vsllink_khz,
 250         .speed_div = vsllink_speed_div,
 251         .register_commands = vsllink_register_commands,
 252         .init = vsllink_init,
 253         .quit = vsllink_quit
 254 };
 255
 256 static int vsllink_execute_queue(void)
 257 {
 258         jtag_command_t *cmd = jtag_command_queue;
 259         int scan_size;
 260         enum scan_type type;
 261         u8 *buffer;
 262
 263         DEBUG_JTAG_IO("--------------------------------- vsllink -------------------------------------");
 264
 265         vsllink_usb_out_buffer[0] = VSLLINK_CMD_HW_JTAGSEQCMD;
 266         vsllink_usb_out_buffer_idx = 3;
 267         while (cmd != NULL)
 268         {
 269                 switch (cmd->type)
 270                 {
 271                         case JTAG_END_STATE:
 272                                 DEBUG_JTAG_IO("end_state: %s", tap_state_name(cmd->cmd.end_state->end_state));
 273
 274                                 if (cmd->cmd.end_state->end_state != TAP_INVALID)
 275                                 {
 276                                         vsllink_end_state(cmd->cmd.end_state->end_state);
 277                                 }
 278                                 break;
 279
 280                         case JTAG_RUNTEST:
 281                                 DEBUG_JTAG_IO( "runtest %i cycles, end in %s", cmd->cmd.runtest->num_cycles, \
 282                                         tap_state_name(cmd->cmd.runtest->end_state));
 283
 284                                 if (cmd->cmd.runtest->end_state != TAP_INVALID)
 285                                 {
 286                                         vsllink_end_state(cmd->cmd.runtest->end_state);
 287                                 }
 288                                 vsllink_runtest(cmd->cmd.runtest->num_cycles);
 289                                 break;
 290
 291                         case JTAG_STATEMOVE:
 292                                 DEBUG_JTAG_IO("statemove end in %s", tap_state_name(cmd->cmd.statemove->end_state));
 293
 294                                 if (cmd->cmd.statemove->end_state != TAP_INVALID)
 295                                 {
 296                                         vsllink_end_state(cmd->cmd.statemove->end_state);
 297                                 }
 298                                 vsllink_state_move();
 299                                 break;
 300
 301                         case JTAG_PATHMOVE:
 302                                 DEBUG_JTAG_IO("pathmove: %i states, end in %s", \
 303                                         cmd->cmd.pathmove->num_states, \
 304                                         tap_state_name(cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]));
 305
 306                                 vsllink_path_move(cmd->cmd.pathmove->num_states, cmd->cmd.pathmove->path);
 307                                 break;
 308
 309                         case JTAG_SCAN:
 310                                 if (cmd->cmd.scan->end_state != TAP_INVALID)
 311                                 {
 312                                         vsllink_end_state(cmd->cmd.scan->end_state);
 313                                 }
 314
 315                                 scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
 316                                 if (cmd->cmd.scan->ir_scan)
 317                                 {
 318                                         DEBUG_JTAG_IO("JTAG Scan write IR(%d bits), end in %s:", scan_size, tap_state_name(cmd->cmd.scan->end_state));
 319                                 }
 320                                 else
 321                                 {
 322                                         DEBUG_JTAG_IO("JTAG Scan write DR(%d bits), end in %s:", scan_size, tap_state_name(cmd->cmd.scan->end_state));
 323                                 }
 324
 325 #ifdef _DEBUG_JTAG_IO_
 326                                 vsllink_debug_buffer(buffer, (scan_size + 7) >> 3);
 327 #endif
 328
 329                                 type = jtag_scan_type(cmd->cmd.scan);
 330
 331                                 vsllink_scan(cmd->cmd.scan->ir_scan, type, buffer, scan_size, cmd->cmd.scan);
 332                                 break;
 333
 334                         case JTAG_RESET:
 335                                 DEBUG_JTAG_IO("reset trst: %i srst %i", cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 336
 337                                 vsllink_tap_execute();
 338
 339                                 if (cmd->cmd.reset->trst == 1)
 340                                 {
 341                                         tap_set_state(TAP_RESET);
 342                                 }
 343                                 vsllink_reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 344
 345                                 vsllink_usb_out_buffer[0] = VSLLINK_CMD_HW_JTAGSEQCMD;
 346                                 vsllink_usb_out_buffer_idx = 3;
 347                                 break;
 348
 349                         case JTAG_SLEEP:
 350                                 DEBUG_JTAG_IO("sleep %i", cmd->cmd.sleep->us);
 351                                 vsllink_tap_execute();
 352                                 jtag_sleep(cmd->cmd.sleep->us);
 353                                 break;
 354
 355                         case JTAG_STABLECLOCKS:
 356                                 DEBUG_JTAG_IO("add %d clocks", cmd->cmd.stableclocks->num_cycles);
 357                                 switch(tap_get_state())
 358                                 {
 359                                 case TAP_RESET:
 360                                         // tms should be '1' to stay in TAP_RESET mode
 361                                         scan_size = 1;
 362                                         break;
 363                                 case TAP_DRSHIFT:
 364                                 case TAP_IDLE:
 365                                 case TAP_DRPAUSE:
 366                                 case TAP_IRSHIFT:
 367                                 case TAP_IRPAUSE:
 368                                         // in other mode, tms should be '0'
 369                                         scan_size = 0;
 370                                         break;                  /* above stable states are OK */
 371                                 default:
 372                                          LOG_ERROR( "jtag_add_clocks() was called with TAP in non-stable state \"%s\"",
 373                                                          tap_state_name(tap_get_state()) );
 374                                          exit(-1);
 375                                 }
 376                                 vsllink_stableclocks(cmd->cmd.stableclocks->num_cycles, scan_size);
 377                                 break;
 378
 379                         default:
 380                                 LOG_ERROR("BUG: unknown JTAG command type encountered: %d", cmd->type);
 381                                 exit(-1);
 382                 }
 383                 cmd = cmd->next;
 384         }
 385
 386         return vsllink_tap_execute();
 387 }
 388
 389 static int vsllink_speed(int speed)
 390 {
 391         int result;
 392
 393         vsllink_usb_out_buffer[0] = VSLLINK_CMD_SET_SPEED;
 394         vsllink_usb_out_buffer[1] = (speed >> 0) & 0xff;
 395         vsllink_usb_out_buffer[2] = (speed >> 8) & 0xFF;
 396
 397         result = vsllink_usb_write(vsllink_jtag_handle, 3);
 398
 399         if (result == 3)
 400         {
 401                 return ERROR_OK;
 402         }
 403         else
 404         {
 405                 LOG_ERROR("VSLLink setting speed failed (%d)", result);
 406                 return ERROR_JTAG_DEVICE_ERROR;
 407         }
 408
 409         return ERROR_OK;
 410 }
 411
 412 static int vsllink_khz(int khz, int *jtag_speed)
 413 {
 414         *jtag_speed = khz;
 415
 416         return ERROR_OK;
 417 }
 418
 419 static int vsllink_speed_div(int jtag_speed, int *khz)
 420 {
 421         *khz = jtag_speed;
 422
 423         return ERROR_OK;
 424 }
 425
 426 static int vsllink_register_commands(struct command_context_s *cmd_ctx)
 427 {
 428         register_command(cmd_ctx, NULL, "vsllink_usb_vid", vsllink_handle_usb_vid_command,
 429                                         COMMAND_CONFIG, NULL);
 430         register_command(cmd_ctx, NULL, "vsllink_usb_pid", vsllink_handle_usb_pid_command,
 431                                         COMMAND_CONFIG, NULL);
 432         register_command(cmd_ctx, NULL, "vsllink_usb_bulkin", vsllink_handle_usb_bulkin_command,
 433                                         COMMAND_CONFIG, NULL);
 434         register_command(cmd_ctx, NULL, "vsllink_usb_bulkout", vsllink_handle_usb_bulkout_command,
 435                                         COMMAND_CONFIG, NULL);
 436
 437         return ERROR_OK;
 438 }
 439
 440 static int vsllink_init(void)
 441 {
 442         int check_cnt;
 443         int result;
 444         char version_str[100];
 445
 446         vsllink_usb_in_buffer = malloc(VSLLINK_BufferSize);
 447         vsllink_usb_out_buffer = malloc(VSLLINK_BufferSize);
 448         if ((vsllink_usb_in_buffer == NULL) || (vsllink_usb_out_buffer == NULL))
 449         {
 450                 LOG_ERROR("Not enough memory");
 451                 exit(-1);
 452         }
 453
 454         vsllink_jtag_handle = vsllink_usb_open();
 455
 456         if (vsllink_jtag_handle == 0)
 457         {
 458                 LOG_ERROR("Can't find USB JTAG Interface! Please check connection and permissions.");
 459                 return ERROR_JTAG_INIT_FAILED;
 460         }
 461
 462         check_cnt = 0;
 463         while (check_cnt < 3)
 464         {
 465                 vsllink_simple_command(VSLLINK_CMD_CONN);
 466                 result = vsllink_usb_read(vsllink_jtag_handle);
 467
 468                 if (result > 2)
 469                 {
 470                         vsllink_usb_in_buffer[result] = 0;
 471                         VSLLINK_BufferSize = vsllink_usb_in_buffer[0] + (vsllink_usb_in_buffer[1] << 8);
 472                         strncpy(version_str, (char *)vsllink_usb_in_buffer + 2, sizeof(version_str));
 473                         LOG_INFO(version_str);
 474
 475                         // free the pre-alloc memroy
 476                         free(vsllink_usb_in_buffer);
 477                         free(vsllink_usb_out_buffer);
 478                         vsllink_usb_in_buffer = NULL;
 479                         vsllink_usb_out_buffer = NULL;
 480
 481                         // alloc new memory
 482                         vsllink_usb_in_buffer = malloc(VSLLINK_BufferSize);
 483                         vsllink_usb_out_buffer = malloc(VSLLINK_BufferSize);
 484                         if ((vsllink_usb_in_buffer == NULL) || (vsllink_usb_out_buffer == NULL))
 485                         {
 486                                 LOG_ERROR("Not enough memory");
 487                                 exit(-1);
 488                         }
 489                         else
 490                         {
 491                                 LOG_INFO("buffer size for USB is %d bytes", VSLLINK_BufferSize);
 492                         }
 493                         break;
 494                 }
 495                 vsllink_simple_command(VSLLINK_CMD_DISCONN);
 496
 497                 check_cnt++;
 498         }
 499
 500         if (check_cnt == 3)
 501         {
 502                 // It's dangerout to proced
 503                 LOG_ERROR("VSLLink initial failed");
 504                 exit(-1);
 505         }
 506
 507         // Set SRST and TRST to output, Set USR1 and USR2 to input
 508         vsllink_usb_out_buffer[0] = VSLLINK_CMD_SET_PORTDIR;
 509         vsllink_usb_out_buffer[1] = JTAG_PINMSK_SRST | JTAG_PINMSK_TRST | JTAG_PINMSK_USR1 | JTAG_PINMSK_USR2;
 510         vsllink_usb_out_buffer[2] = JTAG_PINMSK_SRST | JTAG_PINMSK_TRST;
 511         if (vsllink_usb_write(vsllink_jtag_handle, 3) != 3)
 512         {
 513                 LOG_ERROR("VSLLink USB send data error");
 514                 exit(-1);
 515         }
 516
 517         vsllink_reset(0, 0);
 518
 519         LOG_INFO("VSLLink JTAG Interface ready");
 520
 521         vsllink_tap_init();
 522
 523         return ERROR_OK;
 524 }
 525
 526 static int vsllink_quit(void)
 527 {
 528         if ((vsllink_usb_in_buffer != NULL) && (vsllink_usb_out_buffer != NULL))
 529         {
 530                 // Set all pins to input
 531                 vsllink_usb_out_buffer[0] = VSLLINK_CMD_SET_PORTDIR;
 532                 vsllink_usb_out_buffer[1] = JTAG_PINMSK_SRST | JTAG_PINMSK_TRST | JTAG_PINMSK_USR1 | JTAG_PINMSK_USR2;
 533                 vsllink_usb_out_buffer[2] = 0;
 534                 if (vsllink_usb_write(vsllink_jtag_handle, 3) != 3)
 535                 {
 536                         LOG_ERROR("VSLLink USB send data error");
 537                         exit(-1);
 538                 }
 539
 540                 // disconnect
 541                 vsllink_simple_command(VSLLINK_CMD_DISCONN);
 542                 vsllink_usb_close(vsllink_jtag_handle);
 543         }
 544
 545         if (vsllink_usb_in_buffer != NULL)
 546         {
 547                 free(vsllink_usb_in_buffer);
 548         }
 549         if (vsllink_usb_out_buffer != NULL)
 550         {
 551                 free(vsllink_usb_out_buffer);
 552         }
 553         return ERROR_OK;
 554 }
 555
 556 // when vsllink_tms_data_len > 0, vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] is the byte that need to be appended.
 557 // length of VSLLINK_CMDJTAGSEQ_TMSBYTE has been set, no need to set it here.
 558 static void vsllink_append_tms(void)
 559 {
 560         u8 tms_scan = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
 561         u16 tms2;
 562         tap_state_t     end_state = tap_get_end_state();
 563
 564         if (((tap_get_state() != TAP_RESET) && (tap_get_state() != TAP_IDLE) && (tap_get_state() != TAP_DRPAUSE) && (tap_get_state() != TAP_IRPAUSE)) || \
 565                         (vsllink_tms_data_len <= 0) || (vsllink_tms_data_len >= 8) || \
 566                         (vsllink_tms_cmd_pos == NULL))
 567         {
 568                 LOG_ERROR("There MUST be some bugs in the driver");
 569                 exit(-1);
 570         }
 571
 572         tms2 = (tms_scan & VSLLINK_BIT_MSK[VSLLINK_TAP_MOVE_INSERT_INSIGNIFICANT[tap_move_ndx(tap_get_state())][tap_move_ndx(end_state)].insert_position]) << \
 573                                 vsllink_tms_data_len;
 574         if (VSLLINK_TAP_MOVE_INSERT_INSIGNIFICANT[tap_move_ndx(tap_get_state())][tap_move_ndx(end_state)].insert_value == 1)
 575         {
 576                 tms2 |= VSLLINK_BIT_MSK[8 - vsllink_tms_data_len] << \
 577                                 (vsllink_tms_data_len + VSLLINK_TAP_MOVE_INSERT_INSIGNIFICANT[tap_move_ndx(tap_get_state())][tap_move_ndx(end_state)].insert_position);
 578         }
 579         tms2 |= (tms_scan >> VSLLINK_TAP_MOVE_INSERT_INSIGNIFICANT[tap_move_ndx(tap_get_state())][tap_move_ndx(end_state)].insert_position) << \
 580                                 (8 + VSLLINK_TAP_MOVE_INSERT_INSIGNIFICANT[tap_move_ndx(tap_get_state())][tap_move_ndx(end_state)].insert_position);
 581
 582         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (tms2 >> 0) & 0xff;
 583         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms2 >> 8) & 0xff;
 584
 585         vsllink_tms_data_len = 0;
 586         vsllink_tms_cmd_pos = NULL;
 587 }
 588
 589 /***************************************************************************/
 590 /* Queue command implementations */
 591
 592 static void vsllink_end_state(tap_state_t state)
 593 {
 594         if (tap_is_state_stable(state))
 595         {
 596                 tap_set_end_state(state);
 597         }
 598         else
 599         {
 600                 LOG_ERROR("BUG: %i is not a valid end state", state);
 601                 exit(-1);
 602         }
 603 }
 604
 605 /* Goes to the end state. */
 606 static void vsllink_state_move(void)
 607 {
 608         if (vsllink_tms_data_len > 0)
 609         {
 610                 vsllink_append_tms();
 611         }
 612         else
 613         {
 614                 vsllink_tap_ensure_space(0, 2);
 615
 616                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE;
 617                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
 618         }
 619
 620         tap_set_state(tap_get_end_state());
 621 }
 622
 623 // write tms from current vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx]
 624 static void vsllink_add_path(int start, int num, tap_state_t *path)
 625 {
 626         int i;
 627
 628         for (i = start; i < (start + num); i++)
 629         {
 630                 if ((i & 7) == 0)
 631                 {
 632                         if (i > 0)
 633                         {
 634                                 vsllink_usb_out_buffer_idx++;
 635                         }
 636                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = 0;
 637                 }
 638
 639                 if (path[i - start] == tap_state_transition(tap_get_state(), true))
 640                 {
 641                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] |= 1 << (i & 7);
 642                 }
 643                 else if (path[i - start] == tap_state_transition(tap_get_state(), false))
 644                 {
 645                         // nothing to do
 646                 }
 647                 else
 648                 {
 649                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_name(tap_get_state()), tap_state_name(path[i]));
 650                         exit(-1);
 651                 }
 652                 tap_set_state(path[i - start]);
 653         }
 654         if ((i > 0) && ((i & 7) == 0))
 655         {
 656                 vsllink_usb_out_buffer_idx++;
 657                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = 0;
 658         }
 659
 660         tap_set_end_state(tap_get_state());
 661 }
 662
 663 static void vsllink_path_move(int num_states, tap_state_t *path)
 664 {
 665         int i, tms_len, tms_cmd_pos, path_idx = 0;
 666
 667         if (vsllink_tms_data_len > 0)
 668         {
 669                 // there are vsllink_tms_data_len more tms bits to be shifted
 670                 // so there are vsllink_tms_data_len + num_states tms bits in all
 671                 tms_len = vsllink_tms_data_len + num_states;
 672                 if (tms_len <= 16)
 673                 {
 674                         // merge into last tms shift
 675                         if (tms_len < 8)
 676                         {
 677                                 // just append tms data to the last tms byte
 678                                 vsllink_add_path(vsllink_tms_data_len, num_states, path);
 679                         }
 680                         else if (tms_len == 8)
 681                         {
 682                                 // end last tms shift command
 683                                 (*vsllink_tms_cmd_pos)--;
 684                                 vsllink_add_path(vsllink_tms_data_len, num_states, path);
 685                         }
 686                         else if (tms_len < 16)
 687                         {
 688                                 if ((*vsllink_tms_cmd_pos & VSLLINK_CMDJTAGSEQ_LENMSK) < VSLLINK_CMDJTAGSEQ_LENMSK)
 689                                 {
 690                                         // every tms shift command can contain VSLLINK_CMDJTAGSEQ_LENMSK + 1 bytes in most
 691                                         // there is enought tms length in the current tms shift command
 692                                         (*vsllink_tms_cmd_pos)++;
 693                                         vsllink_add_path(vsllink_tms_data_len, num_states, path);
 694                                 }
 695                                 else
 696                                 {
 697                                         // every tms shift command can contain VSLLINK_CMDJTAGSEQ_LENMSK + 1 bytes in most
 698                                         // not enough tms length in the current tms shift command
 699                                         // so a new command should be added
 700                                         // first decrease byte length of last tms shift command
 701                                         (*vsllink_tms_cmd_pos)--;
 702                                         // append tms data to the last tms byte
 703                                         vsllink_add_path(vsllink_tms_data_len, 8 - vsllink_tms_data_len, path);
 704                                         path += 8 - vsllink_tms_data_len;
 705                                         // add new command(3 bytes)
 706                                         vsllink_tap_ensure_space(0, 3);
 707                                         vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
 708                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | 1;
 709                                         vsllink_add_path(0, num_states - (8 - vsllink_tms_data_len), path);
 710                                 }
 711                         }
 712                         else if (tms_len == 16)
 713                         {
 714                                 // end last tms shift command
 715                                 vsllink_add_path(vsllink_tms_data_len, num_states, path);
 716                         }
 717
 718                         vsllink_tms_data_len = (vsllink_tms_data_len + num_states) & 7;
 719                         if (vsllink_tms_data_len == 0)
 720                         {
 721                                 vsllink_tms_cmd_pos = NULL;
 722                         }
 723                         num_states = 0;
 724                 }
 725                 else
 726                 {
 727                         vsllink_add_path(vsllink_tms_data_len, 16 - vsllink_tms_data_len, path);
 728
 729                         path += 16 - vsllink_tms_data_len;
 730                         num_states -= 16 - vsllink_tms_data_len;
 731                         vsllink_tms_data_len = 0;
 732                         vsllink_tms_cmd_pos = NULL;
 733                 }
 734         }
 735
 736         if (num_states > 0)
 737         {
 738                 // Normal operation, don't need to append tms data
 739                 vsllink_tms_data_len = num_states & 7;
 740
 741                 while (num_states > 0)
 742                 {
 743                         if (num_states > ((VSLLINK_CMDJTAGSEQ_LENMSK + 1) * 8))
 744                         {
 745                                 i = (VSLLINK_CMDJTAGSEQ_LENMSK + 1) * 8;
 746                         }
 747                         else
 748                         {
 749                                 i = num_states;
 750                         }
 751                         tms_len = (i + 7) >> 3;
 752                         vsllink_tap_ensure_space(0, tms_len + 2);
 753                         tms_cmd_pos = vsllink_usb_out_buffer_idx;
 754                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | (tms_len - 1);
 755
 756                         vsllink_add_path(0, i, path + path_idx);
 757
 758                         path_idx += i;
 759                         num_states -= i;
 760                 }
 761
 762                 if (vsllink_tms_data_len > 0)
 763                 {
 764                         if (tms_len < (VSLLINK_CMDJTAGSEQ_LENMSK + 1))
 765                         {
 766                                 vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[tms_cmd_pos];
 767                                 (*vsllink_tms_cmd_pos)++;
 768                         }
 769                         else
 770                         {
 771                                 vsllink_usb_out_buffer[tms_cmd_pos]--;
 772
 773                                 tms_len = vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
 774                                 vsllink_tap_ensure_space(0, 3);
 775                                 vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
 776                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | 1;
 777                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = tms_len;
 778                         }
 779                 }
 780         }
 781 }
 782
 783 static void vsllink_stableclocks(int num_cycles, int tms)
 784 {
 785         int tms_len;
 786         u16 tms_append_byte;
 787
 788         if (vsllink_tms_data_len > 0)
 789         {
 790                 // there are vsllink_tms_data_len more tms bits to be shifted
 791                 // so there are vsllink_tms_data_len + num_cycles tms bits in all
 792                 tms_len = vsllink_tms_data_len + num_cycles;
 793                 if (tms > 0)
 794                 {
 795                         // append '1' for tms
 796                         tms_append_byte = (u16)((((1 << num_cycles) - 1) << vsllink_tms_data_len) & 0xFFFF);
 797                 }
 798                 else
 799                 {
 800                         // append '0' for tms
 801                         tms_append_byte = 0;
 802                 }
 803                 if (tms_len <= 16)
 804                 {
 805                         // merge into last tms shift
 806                         if (tms_len < 8)
 807                         {
 808                                 // just add to vsllink_tms_data_len
 809                                 // same result if tun through
 810                                 //vsllink_tms_data_len += num_cycles;
 811                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] |= (u8)(tms_append_byte & 0xFF);
 812                         }
 813                         else if (tms_len == 8)
 814                         {
 815                                 // end last tms shift command
 816                                 // just reduce it, and append last tms byte
 817                                 (*vsllink_tms_cmd_pos)--;
 818                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (u8)(tms_append_byte & 0xFF);
 819                         }
 820                         else if (tms_len < 16)
 821                         {
 822                                 if ((*vsllink_tms_cmd_pos & VSLLINK_CMDJTAGSEQ_LENMSK) < VSLLINK_CMDJTAGSEQ_LENMSK)
 823                                 {
 824                                         // every tms shift command can contain VSLLINK_CMDJTAGSEQ_LENMSK + 1 bytes in most
 825                                         // there is enought tms length in the current tms shift command
 826                                         // increase the tms byte length by 1 and set the last byte to 0
 827                                         (*vsllink_tms_cmd_pos)++;
 828                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (u8)(tms_append_byte & 0xFF);
 829                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = (u8)(tms_append_byte >> 8);
 830                                 }
 831                                 else
 832                                 {
 833                                         // every tms shift command can contain VSLLINK_CMDJTAGSEQ_LENMSK + 1 bytes in most
 834                                         // not enough tms length in the current tms shift command
 835                                         // so a new command should be added
 836                                         // first decrease byte length of last tms shift command
 837                                         (*vsllink_tms_cmd_pos)--;
 838                                         // append last tms byte and move the command pointer to the next empty position
 839                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (u8)(tms_append_byte & 0xFF);
 840                                         // add new command(3 bytes)
 841                                         vsllink_tap_ensure_space(0, 3);
 842                                         vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
 843                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | 1;
 844                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = (u8)(tms_append_byte >> 8);
 845                                 }
 846                         }
 847                         else if (tms_len == 16)
 848                         {
 849                                 // end last tms shift command
 850                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (u8)(tms_append_byte & 0xFF);
 851                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (u8)(tms_append_byte >> 8);
 852                         }
 853
 854                         vsllink_tms_data_len = tms_len & 7;
 855                         if (vsllink_tms_data_len == 0)
 856                         {
 857                                 vsllink_tms_cmd_pos = NULL;
 858                         }
 859                         num_cycles = 0;
 860                 }
 861                 else
 862                 {
 863                         // more shifts will be needed
 864                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (u8)(tms_append_byte & 0xFF);
 865                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (u8)(tms_append_byte >> 8);
 866
 867                         num_cycles -= 16 - vsllink_tms_data_len;
 868                         vsllink_tms_data_len = 0;
 869                         vsllink_tms_cmd_pos = NULL;
 870                 }
 871         }
 872         // from here vsllink_tms_data_len == 0 or num_cycles == 0
 873
 874         if (vsllink_tms_data_len > 0)
 875         {
 876                 // num_cycles == 0
 877                 // no need to shift
 878                 if (num_cycles > 0)
 879                 {
 880                         LOG_ERROR("There MUST be some bugs in the driver");
 881                         exit(-1);
 882                 }
 883         }
 884         else
 885         {
 886                 // get number of bytes left to be sent
 887                 tms_len = num_cycles >> 3;
 888                 if (tms_len > 0)
 889                 {
 890                         vsllink_tap_ensure_space(1, 5);
 891                         // if tms_len > 0, vsllink_tms_data_len == 0
 892                         // so just add new command
 893                         // LSB of the command byte is the tms value when do the shifting
 894                         if (tms > 0)
 895                         {
 896                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSCLOCK | 1;
 897                         }
 898                         else
 899                         {
 900                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSCLOCK;
 901                         }
 902                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms_len >> 0) & 0xff;
 903                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms_len >> 8) & 0xff;
 904                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms_len >> 16) & 0xff;
 905                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms_len >> 24) & 0xff;
 906
 907                         vsllink_usb_in_want_length += 1;
 908                         pending_scan_results_buffer[pending_scan_results_length].buffer = NULL;
 909                         pending_scan_results_length++;
 910
 911                         if (tms_len > 0xFFFF)
 912                         {
 913                                 vsllink_tap_execute();
 914                         }
 915                 }
 916
 917                 // post-process
 918                 vsllink_tms_data_len = num_cycles & 7;
 919                 if (vsllink_tms_data_len > 0)
 920                 {
 921                         vsllink_tap_ensure_space(0, 3);
 922                         vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
 923                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | 1;
 924                         if (tms > 0)
 925                         {
 926                                 // append '1' for tms
 927                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = (1 << vsllink_tms_data_len) - 1;
 928                         }
 929                         else
 930                         {
 931                                 // append '0' for tms
 932                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = 0x00;
 933                         }
 934                 }
 935         }
 936 }
 937
 938 static void vsllink_runtest(int num_cycles)
 939 {
 940         tap_state_t saved_end_state = tap_get_end_state();
 941
 942         if (tap_get_state() != TAP_IDLE)
 943         {
 944                 // enter into IDLE state
 945                 vsllink_end_state(TAP_IDLE);
 946                 vsllink_state_move();
 947         }
 948
 949         vsllink_stableclocks(num_cycles, 0);
 950
 951         // post-process
 952         // set end_state
 953         vsllink_end_state(saved_end_state);
 954         tap_set_state(TAP_IDLE);
 955         if (tap_get_end_state() != TAP_IDLE)
 956         {
 957                 vsllink_state_move();
 958         }
 959 }
 960
 961 static void vsllink_scan(int ir_scan, enum scan_type type, u8 *buffer, int scan_size, scan_command_t *command)
 962 {
 963         tap_state_t saved_end_state;
 964         u8 bits_left, tms_tmp, tdi_len;
 965         int i;
 966
 967         if (0 == scan_size )
 968         {
 969                 return;
 970         }
 971
 972         tdi_len = ((scan_size + 7) >> 3);
 973         if ((tdi_len + 7) > VSLLINK_BufferSize)
 974         {
 975                 LOG_ERROR("Your implementation of VSLLink has not enough buffer");
 976                 exit(-1);
 977         }
 978
 979         saved_end_state = tap_get_end_state();
 980
 981         /* Move to appropriate scan state */
 982         vsllink_end_state(ir_scan ? TAP_IRSHIFT : TAP_DRSHIFT);
 983
 984         if (vsllink_tms_data_len > 0)
 985         {
 986                 if (tap_get_state() == tap_get_end_state())
 987                 {
 988                         // already in IRSHIFT or DRSHIFT state
 989                         // merge tms data in the last tms shift command into next scan command
 990                         if(*vsllink_tms_cmd_pos < 1)
 991                         {
 992                                 LOG_ERROR("There MUST be some bugs in the driver");
 993                                 exit(-1);
 994                         }
 995                         else if(*vsllink_tms_cmd_pos < 2)
 996                         {
 997                                 tms_tmp = vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
 998                                 vsllink_usb_out_buffer_idx--;
 999                         }
1000                         else
1001                         {
1002                                 tms_tmp = vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
1003                                 *vsllink_tms_cmd_pos -= 2;
1004                         }
1005
1006                         vsllink_tap_ensure_space(1, tdi_len + 7);
1007                         // VSLLINK_CMDJTAGSEQ_SCAN ored by 1 means that tms_before is valid
1008                         // which is merged from the last tms shift command
1009                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_SCAN | 1;
1010                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = ((tdi_len + 1) >> 0) & 0xff;
1011                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = ((tdi_len + 1)>> 8) & 0xff;
1012                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = tms_tmp;
1013                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = buffer[0] << (8 - vsllink_tms_data_len);
1014
1015                         for (i = 0; i < tdi_len; i++)
1016                         {
1017                                 buffer[i] >>= 8 - vsllink_tms_data_len;
1018                                 if (i != tdi_len)
1019                                 {
1020                                         buffer[i] += buffer[i + 1] << vsllink_tms_data_len;
1021                                 }
1022                         }
1023
1024                         vsllink_tap_append_scan(scan_size - vsllink_tms_data_len, buffer, command, vsllink_tms_data_len);
1025                         scan_size -= 8 - vsllink_tms_data_len;
1026                         vsllink_tms_data_len = 0;
1027                 }
1028                 else
1029                 {
1030                         vsllink_append_tms();
1031                         vsllink_tap_ensure_space(1, tdi_len + 5);
1032
1033                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_SCAN;
1034                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tdi_len >> 0) & 0xff;
1035                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tdi_len >> 8) & 0xff;
1036
1037                         vsllink_tap_append_scan(scan_size, buffer, command, 0);
1038                 }
1039         }
1040         else
1041         {
1042                 vsllink_tap_ensure_space(1, tdi_len + 7);
1043
1044                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_SCAN | 1;
1045                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = ((tdi_len + 1) >> 0) & 0xff;
1046                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = ((tdi_len + 1)>> 8) & 0xff;
1047                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
1048                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 0;
1049
1050                 vsllink_tap_append_scan(scan_size, buffer, command, 8);
1051         }
1052         vsllink_end_state(saved_end_state);
1053
1054         bits_left = scan_size & 0x07;
1055         tap_set_state(ir_scan ? TAP_IRPAUSE : TAP_DRPAUSE);
1056
1057         if (bits_left > 0)
1058         {
1059                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 1 << (bits_left - 1);
1060         }
1061         else
1062         {
1063                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 1 << 7;
1064         }
1065
1066         if (tap_get_state() != tap_get_end_state())
1067         {
1068                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
1069         }
1070         else
1071         {
1072                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 0;
1073         }
1074
1075         tap_set_state(tap_get_end_state());
1076 }
1077
1078 static void vsllink_reset(int trst, int srst)
1079 {
1080         int result;
1081
1082         LOG_DEBUG("trst: %i, srst: %i", trst, srst);
1083
1084         /* Signals are active low */
1085         vsllink_usb_out_buffer[0] = VSLLINK_CMD_SET_PORT;
1086         vsllink_usb_out_buffer[1] = JTAG_PINMSK_SRST | JTAG_PINMSK_TRST;
1087         vsllink_usb_out_buffer[2] = 0;
1088         if (srst == 0)
1089         {
1090                 vsllink_usb_out_buffer[2] |= JTAG_PINMSK_SRST;
1091         }
1092         if (trst == 0)
1093         {
1094                 vsllink_usb_out_buffer[2] |= JTAG_PINMSK_TRST;
1095         }
1096
1097         result = vsllink_usb_write(vsllink_jtag_handle, 3);
1098         if (result != 3)
1099         {
1100                 LOG_ERROR("VSLLink command VSLLINK_CMD_SET_PORT failed (%d)", result);
1101         }
1102 }
1103
1104 static void vsllink_simple_command(u8 command)
1105 {
1106         int result;
1107
1108         DEBUG_JTAG_IO("0x%02x", command);
1109
1110         vsllink_usb_out_buffer[0] = command;
1111         result = vsllink_usb_write(vsllink_jtag_handle, 1);
1112
1113         if (result != 1)
1114         {
1115                 LOG_ERROR("VSLLink command 0x%02x failed (%d)", command, result);
1116         }
1117 }
1118
1119 static int vsllink_handle_usb_vid_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1120 {
1121         if (argc != 1) {
1122                 LOG_ERROR("parameter error, should be one parameter for VID");
1123                 return ERROR_OK;
1124         }
1125
1126         vsllink_vid = strtol(args[0], NULL, 0);
1127
1128         return ERROR_OK;
1129 }
1130
1131 static int vsllink_handle_usb_pid_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1132 {
1133         if (argc != 1) {
1134                 LOG_ERROR("parameter error, should be one parameter for PID");
1135                 return ERROR_OK;
1136         }
1137
1138         vsllink_pid = strtol(args[0], NULL, 0);
1139
1140         return ERROR_OK;
1141 }
1142
1143 static int vsllink_handle_usb_bulkin_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1144 {
1145         if (argc != 1) {
1146                 LOG_ERROR("parameter error, should be one parameter for BULKIN endpoint");
1147                 return ERROR_OK;
1148         }
1149
1150         vsllink_bulkin = strtol(args[0], NULL, 0) | 0x80;
1151
1152         return ERROR_OK;
1153 }
1154
1155 static int vsllink_handle_usb_bulkout_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1156 {
1157         if (argc != 1) {
1158                 LOG_ERROR("parameter error, should be one parameter for BULKOUT endpoint");
1159                 return ERROR_OK;
1160         }
1161
1162         vsllink_bulkout = strtol(args[0], NULL, 0);
1163
1164         return ERROR_OK;
1165 }
1166
1167 /***************************************************************************/
1168 /* VSLLink tap functions */
1169
1170 static void vsllink_tap_init(void)
1171 {
1172         vsllink_usb_out_buffer_idx = 0;
1173         vsllink_usb_in_want_length = 0;
1174         pending_scan_results_length = 0;
1175 }
1176
1177 static void vsllink_tap_ensure_space(int scans, int bytes)
1178 {
1179         int available_scans = MAX_PENDING_SCAN_RESULTS - pending_scan_results_length;
1180         int available_bytes = VSLLINK_BufferSize - vsllink_usb_out_buffer_idx;
1181
1182         if (scans > available_scans || bytes > available_bytes)
1183         {
1184                 vsllink_tap_execute();
1185         }
1186 }
1187
1188 static void vsllink_tap_append_scan(int length, u8 *buffer, scan_command_t *command, int offset)
1189 {
1190         pending_scan_result_t *pending_scan_result = &pending_scan_results_buffer[pending_scan_results_length];
1191         int i;
1192
1193         if (offset > 0)
1194         {
1195                 vsllink_usb_in_want_length += ((length + 7) >> 3) + 1;
1196         }
1197         else
1198         {
1199                 vsllink_usb_in_want_length += (length + 7) >> 3;
1200         }
1201         pending_scan_result->length = length;
1202         pending_scan_result->offset = offset;
1203         pending_scan_result->command = command;
1204         pending_scan_result->buffer = buffer;
1205
1206         for (i = 0; i < ((length + 7) >> 3); i++)
1207         {
1208                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = buffer[i];
1209         }
1210
1211         pending_scan_results_length++;
1212 }
1213
1214 /* Pad and send a tap sequence to the device, and receive the answer.
1215  * For the purpose of padding we assume that we are in reset or idle or pause state. */
1216 static int vsllink_tap_execute(void)
1217 {
1218         int i;
1219         int result;
1220         int first = 0;
1221
1222         if (vsllink_tms_data_len > 0)
1223         {
1224                 if((tap_get_state() != TAP_RESET) && (tap_get_state() != TAP_IDLE) && (tap_get_state() != TAP_IRPAUSE) && (tap_get_state() != TAP_DRPAUSE))
1225                 {
1226                         LOG_WARNING("%s is not in RESET or IDLE or PAUSR state", tap_state_name(tap_get_state()));
1227                 }
1228
1229                 if (vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] & (1 << (vsllink_tms_data_len - 1)))
1230                 {
1231                         // last tms bit is '1'
1232                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= 0xFF << vsllink_tms_data_len;
1233                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 0xFF;
1234                         vsllink_tms_data_len = 0;
1235                 }
1236                 else
1237                 {
1238                         // last tms bit is '0'
1239                         vsllink_usb_out_buffer_idx++;
1240                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 0;
1241                         vsllink_tms_data_len = 0;
1242                 }
1243         }
1244
1245         if (vsllink_usb_out_buffer_idx > 3)
1246         {
1247                 if (vsllink_usb_out_buffer[0] == VSLLINK_CMD_HW_JTAGSEQCMD)
1248                 {
1249                         vsllink_usb_out_buffer[1] = (vsllink_usb_out_buffer_idx >> 0) & 0xff;
1250                         vsllink_usb_out_buffer[2] = (vsllink_usb_out_buffer_idx >> 8) & 0xff;
1251                 }
1252
1253                 result = vsllink_usb_message(vsllink_jtag_handle, vsllink_usb_out_buffer_idx, vsllink_usb_in_want_length);
1254
1255                 if (result == vsllink_usb_in_want_length)
1256                 {
1257                         for (i = 0; i < pending_scan_results_length; i++)
1258                         {
1259                                 pending_scan_result_t *pending_scan_result = &pending_scan_results_buffer[i];
1260                                 u8 *buffer = pending_scan_result->buffer;
1261                                 int length = pending_scan_result->length;
1262                                 int offset = pending_scan_result->offset;
1263                                 scan_command_t *command = pending_scan_result->command;
1264
1265                                 if (buffer != NULL)
1266                                 {
1267                                         // IRSHIFT or DRSHIFT
1268                                         buf_set_buf(vsllink_usb_in_buffer, first * 8 + offset, buffer, 0, length);
1269                                         first += (length + offset + 7) >> 3;
1270
1271                                         DEBUG_JTAG_IO("JTAG scan read(%d bits):", length);
1272 #ifdef _DEBUG_JTAG_IO_
1273                                         vsllink_debug_buffer(buffer, (length + 7) >> 3);
1274 #endif
1275
1276                                         if (jtag_read_buffer(buffer, command) != ERROR_OK)
1277                                         {
1278                                                 vsllink_tap_init();
1279                                                 return ERROR_JTAG_QUEUE_FAILED;
1280                                         }
1281
1282                                         free(pending_scan_result->buffer);
1283                                         pending_scan_result->buffer = NULL;
1284                                 }
1285                                 else
1286                                 {
1287                                         first++;
1288                                 }
1289                         }
1290                 }
1291                 else
1292                 {
1293                         LOG_ERROR("vsllink_tap_execute, wrong result %d, expected %d", result, vsllink_usb_in_want_length);
1294                         return ERROR_JTAG_QUEUE_FAILED;
1295                 }
1296
1297                 vsllink_tap_init();
1298         }
1299
1300         vsllink_usb_out_buffer[0] = VSLLINK_CMD_HW_JTAGSEQCMD;
1301         vsllink_usb_out_buffer_idx = 3;
1302
1303         return ERROR_OK;
1304 }
1305
1306 /*****************************************************************************/
1307 /* VSLLink USB low-level functions */
1308
1309 vsllink_jtag_t* vsllink_usb_open(void)
1310 {
1311         struct usb_bus *busses;
1312         struct usb_bus *bus;
1313         struct usb_device *dev;
1314
1315         vsllink_jtag_t *result;
1316
1317         result = (vsllink_jtag_t*) malloc(sizeof(vsllink_jtag_t));
1318
1319         usb_init();
1320         usb_find_busses();
1321         usb_find_devices();
1322
1323         busses = usb_get_busses();
1324
1325         /* find vsllink_jtag device in usb bus */
1326
1327         for (bus = busses; bus; bus = bus->next)
1328         {
1329                 for (dev = bus->devices; dev; dev = dev->next)
1330                 {
1331                         if ((dev->descriptor.idVendor == vsllink_vid) && (dev->descriptor.idProduct == vsllink_pid))
1332                         {
1333                                 result->usb_handle = usb_open(dev);
1334
1335                                 /* usb_set_configuration required under win32 */
1336                                 usb_set_configuration(result->usb_handle, dev->config[0].bConfigurationValue);
1337                                 usb_claim_interface(result->usb_handle, 0);
1338
1339 #if 0
1340                                 /*
1341                                  * This makes problems under Mac OS X. And is not needed
1342                                  * under Windows. Hopefully this will not break a linux build
1343                                  */
1344                                 usb_set_altinterface(result->usb_handle, 0);
1345 #endif
1346                                 return result;
1347                         }
1348                 }
1349         }
1350
1351         free(result);
1352         return NULL;
1353 }
1354
1355 static void vsllink_usb_close(vsllink_jtag_t *vsllink_jtag)
1356 {
1357         usb_close(vsllink_jtag->usb_handle);
1358         free(vsllink_jtag);
1359 }
1360
1361 /* Send a message and receive the reply. */
1362 static int vsllink_usb_message(vsllink_jtag_t *vsllink_jtag, int out_length, int in_length)
1363 {
1364         int result;
1365
1366         result = vsllink_usb_write(vsllink_jtag, out_length);
1367         if (result == out_length)
1368         {
1369                 if (in_length > 0)
1370                 {
1371                         result = vsllink_usb_read(vsllink_jtag);
1372                         if (result == in_length )
1373                         {
1374                                 return result;
1375                         }
1376                         else
1377                         {
1378                                 LOG_ERROR("usb_bulk_read failed (requested=%d, result=%d)", in_length, result);
1379                                 return -1;
1380                         }
1381                 }
1382                 return 0;
1383         }
1384         else
1385         {
1386                 LOG_ERROR("usb_bulk_write failed (requested=%d, result=%d)", out_length, result);
1387                 return -1;
1388         }
1389 }
1390
1391 /* Write data from out_buffer to USB. */
1392 static int vsllink_usb_write(vsllink_jtag_t *vsllink_jtag, int out_length)
1393 {
1394         int result;
1395
1396         if (out_length > VSLLINK_BufferSize)
1397         {
1398                 LOG_ERROR("vsllink_jtag_write illegal out_length=%d (max=%d)", out_length, VSLLINK_BufferSize);
1399                 return -1;
1400         }
1401
1402         result = usb_bulk_write(vsllink_jtag->usb_handle, vsllink_bulkout, \
1403                 (char *)vsllink_usb_out_buffer, out_length, VSLLINK_USB_TIMEOUT);
1404
1405         DEBUG_JTAG_IO("vsllink_usb_write, out_length = %d, result = %d", out_length, result);
1406
1407 #ifdef _DEBUG_USB_COMMS_
1408         LOG_DEBUG("USB out:");
1409         vsllink_debug_buffer(vsllink_usb_out_buffer, out_length);
1410 #endif
1411
1412 #ifdef _VSLLINK_IN_DEBUG_MODE_
1413         usleep(100000);
1414 #endif
1415
1416         return result;
1417 }
1418
1419 /* Read data from USB into in_buffer. */
1420 static int vsllink_usb_read(vsllink_jtag_t *vsllink_jtag)
1421 {
1422         int result = usb_bulk_read(vsllink_jtag->usb_handle, vsllink_bulkin, \
1423                 (char *)vsllink_usb_in_buffer, VSLLINK_BufferSize, VSLLINK_USB_TIMEOUT);
1424
1425         DEBUG_JTAG_IO("vsllink_usb_read, result = %d", result);
1426
1427 #ifdef _DEBUG_USB_COMMS_
1428         LOG_DEBUG("USB in:");
1429         vsllink_debug_buffer(vsllink_usb_in_buffer, result);
1430 #endif
1431         return result;
1432 }
1433
1434 #define BYTES_PER_LINE  16
1435
1436 #ifdef _DEBUG_USB_COMMS_
1437 static void vsllink_debug_buffer(u8 *buffer, int length)
1438 {
1439         char line[81];
1440         char s[4];
1441         int i;
1442         int j;
1443
1444         for (i = 0; i < length; i += BYTES_PER_LINE)
1445         {
1446                 snprintf(line, 5, "%04x", i);
1447                 for (j = i; j < i + BYTES_PER_LINE && j < length; j++)
1448                 {
1449                         snprintf(s, 4, " %02x", buffer[j]);
1450                         strcat(line, s);
1451                 }
1452                 LOG_DEBUG(line);
1453         }
1454 }
1455 #endif // _DEBUG_USB_COMMS_