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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 "interface.h"
  30 #include "commands.h"
  31
  32 #include <usb.h>
  33
  34
  35 //#define _VSLLINK_IN_DEBUG_MODE_
  36
  37 #define VSLLINK_MODE_NORMAL                     0
  38 #define VSLLINK_MODE_DMA                        1
  39
  40 static uint16_t vsllink_usb_vid;
  41 static uint16_t vsllink_usb_pid;
  42 static uint8_t vsllink_usb_bulkout;
  43 static uint8_t vsllink_usb_bulkin;
  44 static uint8_t vsllink_usb_interface;
  45 static uint8_t vsllink_mode = VSLLINK_MODE_NORMAL;
  46 static int VSLLINK_USB_TIMEOUT = 10000;
  47
  48 static int VSLLINK_BufferSize = 1024;
  49
  50 /* Global USB buffers */
  51 static int vsllink_usb_out_buffer_idx;
  52 static int vsllink_usb_in_want_length;
  53 static uint8_t* vsllink_usb_in_buffer = NULL;
  54 static uint8_t* vsllink_usb_out_buffer = NULL;
  55
  56 /* Constants for VSLLink command */
  57 #define VSLLINK_CMD_CONN                        0x80
  58 #define VSLLINK_CMD_DISCONN                     0x81
  59 #define VSLLINK_CMD_SET_SPEED           0x82
  60 #define VSLLINK_CMD_SET_PORT            0x90
  61 #define VSLLINK_CMD_GET_PORT            0x91
  62 #define VSLLINK_CMD_SET_PORTDIR         0x92
  63 #define VSLLINK_CMD_HW_JTAGSEQCMD       0xA0
  64 #define VSLLINK_CMD_HW_JTAGHLCMD        0xA1
  65 #define VSLLINK_CMD_HW_SWDCMD           0xA2
  66 #define VSLLINK_CMD_HW_JTAGRAWCMD       0xA3
  67
  68 #define VSLLINK_CMDJTAGSEQ_TMSBYTE      0x00
  69 #define VSLLINK_CMDJTAGSEQ_TMSCLOCK     0x40
  70 #define VSLLINK_CMDJTAGSEQ_SCAN         0x80
  71
  72 #define VSLLINK_CMDJTAGSEQ_CMDMSK       0xC0
  73 #define VSLLINK_CMDJTAGSEQ_LENMSK       0x3F
  74
  75 #define JTAG_PINMSK_SRST                        (1 << 0)
  76 #define JTAG_PINMSK_TRST                        (1 << 1)
  77 #define JTAG_PINMSK_USR1                        (1 << 2)
  78 #define JTAG_PINMSK_USR2                        (1 << 3)
  79 #define JTAG_PINMSK_TCK                         (1 << 4)
  80 #define JTAG_PINMSK_TMS                         (1 << 5)
  81 #define JTAG_PINMSK_TDI                         (1 << 6)
  82 #define JTAG_PINMSK_TDO                         (1 << 7)
  83
  84
  85 #define VSLLINK_TAP_MOVE(from, to)      VSLLINK_tap_move[tap_move_ndx(from)][tap_move_ndx(to)]
  86
  87 /* VSLLINK_tap_move[i][j]: tap movement command to go from state i to state j
  88  * 0: Test-Logic-Reset
  89  * 1: Run-Test/Idle
  90  * 2: Shift-DR
  91  * 3: Pause-DR
  92  * 4: Shift-IR
  93  * 5: Pause-IR
  94  *
  95  * SD->SD and SI->SI have to be caught in interface specific code
  96  */
  97 static uint8_t VSLLINK_tap_move[6][6] =
  98 {
  99 /*        TLR   RTI   SD    PD    SI    PI             */
 100         {0xff, 0x7f, 0x2f, 0x0a, 0x37, 0x16},   /* TLR */
 101         {0xff, 0x00, 0x45, 0x05, 0x4b, 0x0b},   /* RTI */
 102         {0xff, 0x61, 0x00, 0x01, 0x0f, 0x2f},   /* SD  */
 103         {0xfe, 0x60, 0x40, 0x5c, 0x3c, 0x5e},   /* PD  */
 104         {0xff, 0x61, 0x07, 0x17, 0x00, 0x01},   /* SI  */
 105         {0xfe, 0x60, 0x38, 0x5c, 0x40, 0x5e}    /* PI  */
 106 };
 107
 108 typedef struct insert_insignificant_operation
 109 {
 110         unsigned char insert_value;
 111         unsigned char insert_position;
 112 }insert_insignificant_operation_t;
 113
 114 static insert_insignificant_operation_t VSLLINK_TAP_MOVE_INSERT_INSIGNIFICANT[6][6] =
 115 {
 116 /*       stuff  offset   */
 117         {/*     TLR     */
 118         {1,             0,},    /* TLR */
 119         {1,             0,},    /* RTI */
 120         {1,             0,},    /* SD  */
 121         {1,             0,},    /* PD  */
 122         {1,             0,},    /* SI  */
 123         {1,             0,}},   /* PI  */
 124         {/*     RTI     */
 125         {1,             0,},    /* TLR */
 126         {0,             0,},    /* RTI */
 127         {0,             4,},    /* SD  */
 128         {0,             7,},    /* PD  */
 129         {0,             5,},    /* SI  */
 130         {0,             7,}},   /* PI  */
 131         {/*     SD      */
 132         {0,             0,},    /* TLR */
 133         {0,             0,},    /* RTI */
 134         {0,             0,},    /* SD  */
 135         {0,             0,},    /* PD  */
 136         {0,             0,},    /* SI  */
 137         {0,             0,}},   /* PI  */
 138         {/*     PD      */
 139         {0,             0,},    /* TLR */
 140         {0,             0,},    /* RTI */
 141         {0,             0,},    /* SD  */
 142         {0,             0,},    /* PD  */
 143         {0,             0,},    /* SI  */
 144         {0,             0,}},   /* PI  */
 145         {/*     SI      */
 146         {0,             0,},    /* TLR */
 147         {0,             0,},    /* RTI */
 148         {0,             0,},    /* SD  */
 149         {0,             0,},    /* PD  */
 150         {0,             0,},    /* SI  */
 151         {0,             0,}},   /* PI  */
 152         {/*     PI      */
 153         {0,             0,},    /* TLR */
 154         {0,             0,},    /* RTI */
 155         {0,             0,},    /* SD  */
 156         {0,             0,},    /* PD  */
 157         {0,             0,},    /* SI  */
 158         {0,             0,}},   /* PI  */
 159 };
 160
 161 static uint8_t VSLLINK_BIT_MSK[8] =
 162 {
 163         0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f
 164 };
 165
 166 typedef struct
 167 {
 168         int offset;
 169         int length; /* Number of bits to read */
 170         scan_command_t *command; /* Corresponding scan command */
 171         uint8_t *buffer;
 172 } pending_scan_result_t;
 173
 174 #define MAX_PENDING_SCAN_RESULTS 256
 175
 176 static int pending_scan_results_length;
 177 static pending_scan_result_t pending_scan_results_buffer[MAX_PENDING_SCAN_RESULTS];
 178
 179 /* External interface functions */
 180 static int vsllink_execute_queue(void);
 181 static int vsllink_speed(int speed);
 182 static int vsllink_khz(int khz, int *jtag_speed);
 183 static int vsllink_speed_div(int jtag_speed, int *khz);
 184 static int vsllink_register_commands(struct command_context_s *cmd_ctx);
 185 static int vsllink_init(void);
 186 static int vsllink_quit(void);
 187
 188 /* CLI command handler functions */
 189 static int vsllink_handle_usb_vid_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 190 static int vsllink_handle_usb_pid_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 191 static int vsllink_handle_usb_bulkin_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 192 static int vsllink_handle_usb_bulkout_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 193 static int vsllink_handle_usb_interface_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 194 static int vsllink_handle_mode_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 195
 196 /* Queue command functions */
 197 static void vsllink_end_state(tap_state_t state);
 198 static void vsllink_state_move_dma(void);
 199 static void vsllink_state_move_normal(void);
 200 static void (*vsllink_state_move)(void);
 201 static void vsllink_path_move_dma(int num_states, tap_state_t *path);
 202 static void vsllink_path_move_normal(int num_states, tap_state_t *path);
 203 static void (*vsllink_path_move)(int num_states, tap_state_t *path);
 204 static void vsllink_runtest(int num_cycles);
 205 static void vsllink_stableclocks_dma(int num_cycles, int tms);
 206 static void vsllink_stableclocks_normal(int num_cycles, int tms);
 207 static void (*vsllink_stableclocks)(int num_cycles, int tms);
 208 static void vsllink_scan_dma(bool ir_scan, enum scan_type type, uint8_t *buffer, int scan_size, scan_command_t *command);
 209 static void vsllink_scan_normal(bool ir_scan, enum scan_type type, uint8_t *buffer, int scan_size, scan_command_t *command);
 210 static void (*vsllink_scan)(bool ir_scan, enum scan_type type, uint8_t *buffer, int scan_size, scan_command_t *command);
 211 static void vsllink_reset(int trst, int srst);
 212 static void vsllink_simple_command(uint8_t command);
 213 static int vsllink_connect(void);
 214 static int vsllink_disconnect(void);
 215
 216 /* VSLLink tap buffer functions */
 217 static void vsllink_tap_append_step(int tms, int tdi);
 218 static void vsllink_tap_init_dma(void);
 219 static void vsllink_tap_init_normal(void);
 220 static void (*vsllink_tap_init)(void);
 221 static int vsllink_tap_execute_dma(void);
 222 static int vsllink_tap_execute_normal(void);
 223 static int (*vsllink_tap_execute)(void);
 224 static void vsllink_tap_ensure_space_dma(int scans, int length);
 225 static void vsllink_tap_ensure_space_normal(int scans, int length);
 226 static void (*vsllink_tap_ensure_space)(int scans, int length);
 227 static void vsllink_tap_append_scan_dma(int length, uint8_t *buffer, scan_command_t *command);
 228 static void vsllink_tap_append_scan_normal(int length, uint8_t *buffer, scan_command_t *command, int offset);
 229
 230 /* VSLLink lowlevel functions */
 231 typedef struct vsllink_jtag
 232 {
 233         struct usb_dev_handle* usb_handle;
 234 } vsllink_jtag_t;
 235
 236 static vsllink_jtag_t *vsllink_usb_open(void);
 237 static void vsllink_usb_close(vsllink_jtag_t *vsllink_jtag);
 238 static int vsllink_usb_message(vsllink_jtag_t *vsllink_jtag, int out_length, int in_length);
 239 static int vsllink_usb_write(vsllink_jtag_t *vsllink_jtag, int out_length);
 240 static int vsllink_usb_read(vsllink_jtag_t *vsllink_jtag);
 241
 242 #if defined _DEBUG_USB_COMMS_ || defined _DEBUG_JTAG_IO_
 243 static void vsllink_debug_buffer(uint8_t *buffer, int length);
 244 #endif
 245
 246 static int vsllink_tms_data_len = 0;
 247 static uint8_t* vsllink_tms_cmd_pos;
 248
 249 static int tap_length = 0;
 250 static int tap_buffer_size = 0;
 251 static uint8_t *tms_buffer = NULL;
 252 static uint8_t *tdi_buffer = NULL;
 253 static uint8_t *tdo_buffer = NULL;
 254 static int last_tms;
 255
 256 static vsllink_jtag_t* vsllink_jtag_handle = NULL;
 257
 258 /***************************************************************************/
 259 /* External interface implementation */
 260
 261 jtag_interface_t vsllink_interface =
 262 {
 263         .name = "vsllink",
 264         .execute_queue = vsllink_execute_queue,
 265         .speed = vsllink_speed,
 266         .khz = vsllink_khz,
 267         .speed_div = vsllink_speed_div,
 268         .register_commands = vsllink_register_commands,
 269         .init = vsllink_init,
 270         .quit = vsllink_quit
 271 };
 272
 273 static void reset_command_pointer(void)
 274 {
 275         if (vsllink_mode == VSLLINK_MODE_NORMAL)
 276         {
 277                 vsllink_usb_out_buffer[0] = VSLLINK_CMD_HW_JTAGSEQCMD;
 278                 vsllink_usb_out_buffer_idx = 3;
 279         }
 280         else
 281         {
 282                 tap_length = 0;
 283         }
 284 }
 285
 286 static int vsllink_execute_queue(void)
 287 {
 288         jtag_command_t *cmd = jtag_command_queue;
 289         int scan_size;
 290         enum scan_type type;
 291         uint8_t *buffer;
 292
 293         DEBUG_JTAG_IO("--------------------------------- vsllink -------------------------------------");
 294
 295         reset_command_pointer();
 296         while (cmd != NULL)
 297         {
 298                 switch (cmd->type)
 299                 {
 300                         case JTAG_RUNTEST:
 301                                 DEBUG_JTAG_IO( "runtest %i cycles, end in %s", cmd->cmd.runtest->num_cycles, \
 302                                         tap_state_name(cmd->cmd.runtest->end_state));
 303
 304                                 vsllink_end_state(cmd->cmd.runtest->end_state);
 305                                 vsllink_runtest(cmd->cmd.runtest->num_cycles);
 306                                 break;
 307
 308                         case JTAG_STATEMOVE:
 309                                 DEBUG_JTAG_IO("statemove end in %s", tap_state_name(cmd->cmd.statemove->end_state));
 310
 311                                 vsllink_end_state(cmd->cmd.statemove->end_state);
 312                                 vsllink_state_move();
 313                                 break;
 314
 315                         case JTAG_PATHMOVE:
 316                                 DEBUG_JTAG_IO("pathmove: %i states, end in %s", \
 317                                         cmd->cmd.pathmove->num_states, \
 318                                         tap_state_name(cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]));
 319
 320                                 vsllink_path_move(cmd->cmd.pathmove->num_states, cmd->cmd.pathmove->path);
 321                                 break;
 322
 323                         case JTAG_SCAN:
 324                                 vsllink_end_state(cmd->cmd.scan->end_state);
 325
 326                                 scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
 327                                 if (cmd->cmd.scan->ir_scan)
 328                                 {
 329                                         DEBUG_JTAG_IO("JTAG Scan write IR(%d bits), end in %s:", scan_size, tap_state_name(cmd->cmd.scan->end_state));
 330                                 }
 331                                 else
 332                                 {
 333                                         DEBUG_JTAG_IO("JTAG Scan write DR(%d bits), end in %s:", scan_size, tap_state_name(cmd->cmd.scan->end_state));
 334                                 }
 335
 336 #ifdef _DEBUG_JTAG_IO_
 337                                 vsllink_debug_buffer(buffer, (scan_size + 7) >> 3);
 338 #endif
 339
 340                                 type = jtag_scan_type(cmd->cmd.scan);
 341
 342                                 vsllink_scan(cmd->cmd.scan->ir_scan, type, buffer, scan_size, cmd->cmd.scan);
 343                                 break;
 344
 345                         case JTAG_RESET:
 346                                 DEBUG_JTAG_IO("reset trst: %i srst %i", cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 347
 348                                 vsllink_tap_execute();
 349
 350                                 if (cmd->cmd.reset->trst == 1)
 351                                 {
 352                                         tap_set_state(TAP_RESET);
 353                                 }
 354                                 vsllink_reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 355                                 break;
 356
 357                         case JTAG_SLEEP:
 358                                 DEBUG_JTAG_IO("sleep %i", cmd->cmd.sleep->us);
 359                                 vsllink_tap_execute();
 360                                 jtag_sleep(cmd->cmd.sleep->us);
 361                                 break;
 362
 363                         case JTAG_STABLECLOCKS:
 364                                 DEBUG_JTAG_IO("add %d clocks", cmd->cmd.stableclocks->num_cycles);
 365                                 switch(tap_get_state())
 366                                 {
 367                                 case TAP_RESET:
 368                                         // tms should be '1' to stay in TAP_RESET mode
 369                                         scan_size = 1;
 370                                         break;
 371                                 case TAP_DRSHIFT:
 372                                 case TAP_IDLE:
 373                                 case TAP_DRPAUSE:
 374                                 case TAP_IRSHIFT:
 375                                 case TAP_IRPAUSE:
 376                                         // in other mode, tms should be '0'
 377                                         scan_size = 0;
 378                                         break;                  /* above stable states are OK */
 379                                 default:
 380                                          LOG_ERROR( "jtag_add_clocks() was called with TAP in non-stable state \"%s\"",
 381                                                          tap_state_name(tap_get_state()) );
 382                                          exit(-1);
 383                                 }
 384                                 vsllink_stableclocks(cmd->cmd.stableclocks->num_cycles, scan_size);
 385                                 break;
 386
 387                         default:
 388                                 LOG_ERROR("BUG: unknown JTAG command type encountered: %d", cmd->type);
 389                                 exit(-1);
 390                 }
 391                 cmd = cmd->next;
 392         }
 393
 394         return vsllink_tap_execute();
 395 }
 396
 397 static int vsllink_speed(int speed)
 398 {
 399         int result;
 400
 401         vsllink_usb_out_buffer[0] = VSLLINK_CMD_SET_SPEED;
 402         vsllink_usb_out_buffer[1] = (speed >> 0) & 0xff;
 403         vsllink_usb_out_buffer[2] = (speed >> 8) & 0xFF;
 404
 405         result = vsllink_usb_write(vsllink_jtag_handle, 3);
 406
 407         if (result == 3)
 408         {
 409                 return ERROR_OK;
 410         }
 411         else
 412         {
 413                 LOG_ERROR("VSLLink setting speed failed (%d)", result);
 414                 return ERROR_JTAG_DEVICE_ERROR;
 415         }
 416
 417         return ERROR_OK;
 418 }
 419
 420 static int vsllink_khz(int khz, int *jtag_speed)
 421 {
 422         *jtag_speed = khz;
 423
 424         return ERROR_OK;
 425 }
 426
 427 static int vsllink_speed_div(int jtag_speed, int *khz)
 428 {
 429         *khz = jtag_speed;
 430
 431         return ERROR_OK;
 432 }
 433
 434 static int vsllink_init(void)
 435 {
 436         int check_cnt, to_tmp;
 437         int result;
 438         char version_str[100];
 439
 440         vsllink_usb_in_buffer = malloc(VSLLINK_BufferSize);
 441         vsllink_usb_out_buffer = malloc(VSLLINK_BufferSize);
 442         if ((vsllink_usb_in_buffer == NULL) || (vsllink_usb_out_buffer == NULL))
 443         {
 444                 LOG_ERROR("Not enough memory");
 445                 exit(-1);
 446         }
 447
 448         vsllink_jtag_handle = vsllink_usb_open();
 449
 450         if (vsllink_jtag_handle == 0)
 451         {
 452                 LOG_ERROR("Can't find USB JTAG Interface! Please check connection and permissions.");
 453                 return ERROR_JTAG_INIT_FAILED;
 454         }
 455         LOG_DEBUG("vsllink found on %04X:%04X", vsllink_usb_vid, vsllink_usb_pid);
 456
 457         to_tmp = VSLLINK_USB_TIMEOUT;
 458         VSLLINK_USB_TIMEOUT = 100;
 459         check_cnt = 0;
 460         while (check_cnt < 5)
 461         {
 462                 vsllink_simple_command(0x00);
 463                 result = vsllink_usb_read(vsllink_jtag_handle);
 464
 465                 if (result > 2)
 466                 {
 467                         vsllink_usb_in_buffer[result] = 0;
 468                         VSLLINK_BufferSize = vsllink_usb_in_buffer[0] + (vsllink_usb_in_buffer[1] << 8);
 469                         strncpy(version_str, (char *)vsllink_usb_in_buffer + 2, sizeof(version_str));
 470                         LOG_INFO("%s", version_str);
 471
 472                         // free the pre-alloc memroy
 473                         free(vsllink_usb_in_buffer);
 474                         free(vsllink_usb_out_buffer);
 475                         vsllink_usb_in_buffer = NULL;
 476                         vsllink_usb_out_buffer = NULL;
 477
 478                         // alloc new memory
 479                         vsllink_usb_in_buffer = malloc(VSLLINK_BufferSize);
 480                         vsllink_usb_out_buffer = malloc(VSLLINK_BufferSize);
 481                         if ((vsllink_usb_in_buffer == NULL) || (vsllink_usb_out_buffer == NULL))
 482                         {
 483                                 LOG_ERROR("Not enough memory");
 484                                 exit(-1);
 485                         }
 486                         else
 487                         {
 488                                 LOG_INFO("buffer size for USB is %d bytes", VSLLINK_BufferSize);
 489                         }
 490                         // alloc memory for dma mode
 491                         if (vsllink_mode == VSLLINK_MODE_DMA)
 492                         {
 493                                 tap_buffer_size = (VSLLINK_BufferSize - 3) / 2;
 494                                 tms_buffer = (uint8_t*)malloc(tap_buffer_size);
 495                                 tdi_buffer = (uint8_t*)malloc(tap_buffer_size);
 496                                 tdo_buffer = (uint8_t*)malloc(tap_buffer_size);
 497                                 if ((tms_buffer == NULL) || (tdi_buffer == NULL) || (tdo_buffer == NULL))
 498                                 {
 499                                         LOG_ERROR("Not enough memory");
 500                                         exit(-1);
 501                                 }
 502                         }
 503                         break;
 504                 }
 505                 vsllink_simple_command(VSLLINK_CMD_DISCONN);
 506                 check_cnt++;
 507         }
 508         if (check_cnt == 3)
 509         {
 510                 // It's dangerout to proced
 511                 LOG_ERROR("VSLLink initial failed");
 512                 exit(-1);
 513         }
 514         VSLLINK_USB_TIMEOUT = to_tmp;
 515
 516         // connect to vsllink
 517         vsllink_connect();
 518         // initialize function pointers
 519         if (vsllink_mode == VSLLINK_MODE_NORMAL)
 520         {
 521                 // normal mode
 522                 vsllink_state_move = vsllink_state_move_normal;
 523                 vsllink_path_move = vsllink_path_move_normal;
 524                 vsllink_stableclocks = vsllink_stableclocks_normal;
 525                 vsllink_scan = vsllink_scan_normal;
 526
 527                 vsllink_tap_init = vsllink_tap_init_normal;
 528                 vsllink_tap_execute = vsllink_tap_execute_normal;
 529                 vsllink_tap_ensure_space = vsllink_tap_ensure_space_normal;
 530
 531                 LOG_INFO("vsllink run in NORMAL mode");
 532         }
 533         else
 534         {
 535                 // dma mode
 536                 vsllink_state_move = vsllink_state_move_dma;
 537                 vsllink_path_move = vsllink_path_move_dma;
 538                 vsllink_stableclocks = vsllink_stableclocks_dma;
 539                 vsllink_scan = vsllink_scan_dma;
 540
 541                 vsllink_tap_init = vsllink_tap_init_dma;
 542                 vsllink_tap_execute = vsllink_tap_execute_dma;
 543                 vsllink_tap_ensure_space = vsllink_tap_ensure_space_dma;
 544
 545                 LOG_INFO("vsllink run in DMA mode");
 546         }
 547
 548         // Set SRST and TRST to output, Set USR1 and USR2 to input
 549         vsllink_usb_out_buffer[0] = VSLLINK_CMD_SET_PORTDIR;
 550         vsllink_usb_out_buffer[1] = JTAG_PINMSK_SRST | JTAG_PINMSK_TRST | JTAG_PINMSK_USR1 | JTAG_PINMSK_USR2;
 551         vsllink_usb_out_buffer[2] = JTAG_PINMSK_SRST | JTAG_PINMSK_TRST;
 552         if (vsllink_usb_write(vsllink_jtag_handle, 3) != 3)
 553         {
 554                 LOG_ERROR("VSLLink USB send data error");
 555                 exit(-1);
 556         }
 557
 558         vsllink_reset(0, 0);
 559
 560         LOG_INFO("VSLLink JTAG Interface ready");
 561
 562         vsllink_tap_init();
 563
 564         return ERROR_OK;
 565 }
 566
 567 static int vsllink_quit(void)
 568 {
 569         if ((vsllink_usb_in_buffer != NULL) && (vsllink_usb_out_buffer != NULL))
 570         {
 571                 // Set all pins to input
 572                 vsllink_usb_out_buffer[0] = VSLLINK_CMD_SET_PORTDIR;
 573                 vsllink_usb_out_buffer[1] = JTAG_PINMSK_SRST | JTAG_PINMSK_TRST | JTAG_PINMSK_USR1 | JTAG_PINMSK_USR2;
 574                 vsllink_usb_out_buffer[2] = 0;
 575                 if (vsllink_usb_write(vsllink_jtag_handle, 3) != 3)
 576                 {
 577                         LOG_ERROR("VSLLink USB send data error");
 578                         exit(-1);
 579                 }
 580
 581                 // disconnect
 582                 vsllink_disconnect();
 583                 vsllink_usb_close(vsllink_jtag_handle);
 584                 vsllink_jtag_handle = NULL;
 585         }
 586
 587         if (vsllink_usb_in_buffer != NULL)
 588         {
 589                 free(vsllink_usb_in_buffer);
 590                 vsllink_usb_in_buffer = NULL;
 591         }
 592         if (vsllink_usb_out_buffer != NULL)
 593         {
 594                 free(vsllink_usb_out_buffer);
 595                 vsllink_usb_out_buffer = NULL;
 596         }
 597
 598         return ERROR_OK;
 599 }
 600
 601 /***************************************************************************/
 602 /* Queue command implementations */
 603 static int vsllink_disconnect(void)
 604 {
 605         vsllink_simple_command(VSLLINK_CMD_DISCONN);
 606         return ERROR_OK;
 607 }
 608
 609 static int vsllink_connect(void)
 610 {
 611         char vsllink_str[100];
 612
 613         vsllink_usb_out_buffer[0] = VSLLINK_CMD_CONN;
 614         vsllink_usb_out_buffer[1] = vsllink_mode;
 615         vsllink_usb_message(vsllink_jtag_handle, 2, 0);
 616         if (vsllink_usb_read(vsllink_jtag_handle) > 2)
 617         {
 618                 strncpy(vsllink_str, (char *)vsllink_usb_in_buffer + 2, sizeof(vsllink_str));
 619                 LOG_INFO("%s", vsllink_str);
 620         }
 621
 622         return ERROR_OK;
 623 }
 624
 625 // when vsllink_tms_data_len > 0, vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] is the byte that need to be appended.
 626 // length of VSLLINK_CMDJTAGSEQ_TMSBYTE has been set, no need to set it here.
 627 static void vsllink_append_tms(void)
 628 {
 629         uint8_t tms_scan = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
 630         uint16_t tms2;
 631         insert_insignificant_operation_t *insert = \
 632                 &VSLLINK_TAP_MOVE_INSERT_INSIGNIFICANT[tap_move_ndx(tap_get_state())][tap_move_ndx(tap_get_end_state())];
 633
 634         if (((tap_get_state() != TAP_RESET) && (tap_get_state() != TAP_IDLE) && (tap_get_state() != TAP_DRPAUSE) && (tap_get_state() != TAP_IRPAUSE)) || \
 635                         (vsllink_tms_data_len <= 0) || (vsllink_tms_data_len >= 8) || \
 636                         (vsllink_tms_cmd_pos == NULL))
 637         {
 638                 LOG_ERROR("There MUST be some bugs in the driver");
 639                 exit(-1);
 640         }
 641
 642         tms2 = (tms_scan & VSLLINK_BIT_MSK[insert->insert_position]) << \
 643                                 vsllink_tms_data_len;
 644         if (insert->insert_value == 1)
 645         {
 646                 tms2 |= VSLLINK_BIT_MSK[8 - vsllink_tms_data_len] << \
 647                                 (vsllink_tms_data_len + insert->insert_position);
 648         }
 649         tms2 |= (tms_scan >> insert->insert_position) << \
 650                                 (8 + insert->insert_position);
 651
 652         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (tms2 >> 0) & 0xff;
 653         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms2 >> 8) & 0xff;
 654
 655         vsllink_tms_data_len = 0;
 656         vsllink_tms_cmd_pos = NULL;
 657 }
 658
 659 static void vsllink_end_state(tap_state_t state)
 660 {
 661         if (tap_is_state_stable(state))
 662         {
 663                 tap_set_end_state(state);
 664         }
 665         else
 666         {
 667                 LOG_ERROR("BUG: %i is not a valid end state", state);
 668                 exit(-1);
 669         }
 670 }
 671
 672 /* Goes to the end state. */
 673 static void vsllink_state_move_normal(void)
 674 {
 675         if (vsllink_tms_data_len > 0)
 676         {
 677                 vsllink_append_tms();
 678         }
 679         else
 680         {
 681                 vsllink_tap_ensure_space(0, 2);
 682
 683                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE;
 684                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
 685         }
 686
 687         tap_set_state(tap_get_end_state());
 688 }
 689 static void vsllink_state_move_dma(void)
 690 {
 691         int i, insert_length = (tap_length % 8) ? (8 - (tap_length % 8)) : 0;
 692         insert_insignificant_operation_t *insert = \
 693                 &VSLLINK_TAP_MOVE_INSERT_INSIGNIFICANT[tap_move_ndx(tap_get_state())][tap_move_ndx(tap_get_end_state())];
 694         uint8_t tms_scan = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
 695
 696         if (tap_get_state() == TAP_RESET)
 697         {
 698                 vsllink_tap_ensure_space(0, 8);
 699
 700                 for (i = 0; i < 8; i++)
 701                 {
 702                         vsllink_tap_append_step(1, 0);
 703                 }
 704         }
 705
 706         if (insert_length > 0)
 707         {
 708                 vsllink_tap_ensure_space(0, 16);
 709
 710                 for (i = 0; i < insert->insert_position; i++)
 711                 {
 712                         vsllink_tap_append_step((tms_scan >> i) & 1, 0);
 713                 }
 714                 for (i = 0; i < insert_length; i++)
 715                 {
 716                         vsllink_tap_append_step(insert->insert_value, 0);
 717                 }
 718                 for (i = insert->insert_position; i < 8; i++)
 719                 {
 720                         vsllink_tap_append_step((tms_scan >> i) & 1, 0);
 721                 }
 722         }
 723         else
 724         {
 725                 vsllink_tap_ensure_space(0, 8);
 726
 727                 for (i = 0; i < 8; i++)
 728                 {
 729                         vsllink_tap_append_step((tms_scan >> i) & 1, 0);
 730                 }
 731         }
 732
 733         tap_set_state(tap_get_end_state());
 734 }
 735
 736 // write tms from current vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx]
 737 static void vsllink_add_path(int start, int num, tap_state_t *path)
 738 {
 739         int i;
 740
 741         for (i = start; i < (start + num); i++)
 742         {
 743                 if ((i & 7) == 0)
 744                 {
 745                         if (i > 0)
 746                         {
 747                                 vsllink_usb_out_buffer_idx++;
 748                         }
 749                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = 0;
 750                 }
 751
 752                 if (path[i - start] == tap_state_transition(tap_get_state(), true))
 753                 {
 754                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] |= 1 << (i & 7);
 755                 }
 756                 else if (path[i - start] == tap_state_transition(tap_get_state(), false))
 757                 {
 758                         // nothing to do
 759                 }
 760                 else
 761                 {
 762                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_name(tap_get_state()), tap_state_name(path[i]));
 763                         exit(-1);
 764                 }
 765                 tap_set_state(path[i - start]);
 766         }
 767         if ((i > 0) && ((i & 7) == 0))
 768         {
 769                 vsllink_usb_out_buffer_idx++;
 770                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = 0;
 771         }
 772
 773         tap_set_end_state(tap_get_state());
 774 }
 775
 776 static void vsllink_path_move_normal(int num_states, tap_state_t *path)
 777 {
 778         int i, tms_len, tms_cmd_pos, path_idx = 0;
 779
 780         if (vsllink_tms_data_len > 0)
 781         {
 782                 // there are vsllink_tms_data_len more tms bits to be shifted
 783                 // so there are vsllink_tms_data_len + num_states tms bits in all
 784                 tms_len = vsllink_tms_data_len + num_states;
 785                 if (tms_len <= 16)
 786                 {
 787                         // merge into last tms shift
 788                         if (tms_len < 8)
 789                         {
 790                                 // just append tms data to the last tms byte
 791                                 vsllink_add_path(vsllink_tms_data_len, num_states, path);
 792                         }
 793                         else if (tms_len == 8)
 794                         {
 795                                 // end last tms shift command
 796                                 (*vsllink_tms_cmd_pos)--;
 797                                 vsllink_add_path(vsllink_tms_data_len, num_states, path);
 798                         }
 799                         else if (tms_len < 16)
 800                         {
 801                                 if ((*vsllink_tms_cmd_pos & VSLLINK_CMDJTAGSEQ_LENMSK) < VSLLINK_CMDJTAGSEQ_LENMSK)
 802                                 {
 803                                         // every tms shift command can contain VSLLINK_CMDJTAGSEQ_LENMSK + 1 bytes in most
 804                                         // there is enought tms length in the current tms shift command
 805                                         (*vsllink_tms_cmd_pos)++;
 806                                         vsllink_add_path(vsllink_tms_data_len, num_states, path);
 807                                 }
 808                                 else
 809                                 {
 810                                         // every tms shift command can contain VSLLINK_CMDJTAGSEQ_LENMSK + 1 bytes in most
 811                                         // not enough tms length in the current tms shift command
 812                                         // so a new command should be added
 813                                         // first decrease byte length of last tms shift command
 814                                         (*vsllink_tms_cmd_pos)--;
 815                                         // append tms data to the last tms byte
 816                                         vsllink_add_path(vsllink_tms_data_len, 8 - vsllink_tms_data_len, path);
 817                                         path += 8 - vsllink_tms_data_len;
 818                                         // add new command(3 bytes)
 819                                         vsllink_tap_ensure_space(0, 3);
 820                                         vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
 821                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | 1;
 822                                         vsllink_add_path(0, num_states - (8 - vsllink_tms_data_len), path);
 823                                 }
 824                         }
 825                         else if (tms_len == 16)
 826                         {
 827                                 // end last tms shift command
 828                                 vsllink_add_path(vsllink_tms_data_len, num_states, path);
 829                         }
 830
 831                         vsllink_tms_data_len = (vsllink_tms_data_len + num_states) & 7;
 832                         if (vsllink_tms_data_len == 0)
 833                         {
 834                                 vsllink_tms_cmd_pos = NULL;
 835                         }
 836                         num_states = 0;
 837                 }
 838                 else
 839                 {
 840                         vsllink_add_path(vsllink_tms_data_len, 16 - vsllink_tms_data_len, path);
 841
 842                         path += 16 - vsllink_tms_data_len;
 843                         num_states -= 16 - vsllink_tms_data_len;
 844                         vsllink_tms_data_len = 0;
 845                         vsllink_tms_cmd_pos = NULL;
 846                 }
 847         }
 848
 849         if (num_states > 0)
 850         {
 851                 // Normal operation, don't need to append tms data
 852                 vsllink_tms_data_len = num_states & 7;
 853
 854                 while (num_states > 0)
 855                 {
 856                         if (num_states > ((VSLLINK_CMDJTAGSEQ_LENMSK + 1) * 8))
 857                         {
 858                                 i = (VSLLINK_CMDJTAGSEQ_LENMSK + 1) * 8;
 859                         }
 860                         else
 861                         {
 862                                 i = num_states;
 863                         }
 864                         tms_len = (i + 7) >> 3;
 865                         vsllink_tap_ensure_space(0, tms_len + 2);
 866                         tms_cmd_pos = vsllink_usb_out_buffer_idx;
 867                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | (tms_len - 1);
 868
 869                         vsllink_add_path(0, i, path + path_idx);
 870
 871                         path_idx += i;
 872                         num_states -= i;
 873                 }
 874
 875                 if (vsllink_tms_data_len > 0)
 876                 {
 877                         if (tms_len < (VSLLINK_CMDJTAGSEQ_LENMSK + 1))
 878                         {
 879                                 vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[tms_cmd_pos];
 880                                 (*vsllink_tms_cmd_pos)++;
 881                         }
 882                         else
 883                         {
 884                                 vsllink_usb_out_buffer[tms_cmd_pos]--;
 885
 886                                 tms_len = vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
 887                                 vsllink_tap_ensure_space(0, 3);
 888                                 vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
 889                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | 1;
 890                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = tms_len;
 891                         }
 892                 }
 893         }
 894 }
 895 static void vsllink_path_move_dma(int num_states, tap_state_t *path)
 896 {
 897         int i, j = 0;
 898
 899         if (tap_length & 7)
 900         {
 901                 if ((8 - (tap_length & 7)) < num_states)
 902                 {
 903                         j = 8 - (tap_length & 7);
 904                 }
 905                 else
 906                 {
 907                         j = num_states;
 908                 }
 909                 for (i = 0; i < j; i++)
 910                 {
 911                         if (path[i] == tap_state_transition(tap_get_state(), false))
 912                         {
 913                                 vsllink_tap_append_step(0, 0);
 914                         }
 915                         else if (path[i] == tap_state_transition(tap_get_state(), true))
 916                         {
 917                                 vsllink_tap_append_step(1, 0);
 918                         }
 919                         else
 920                         {
 921                                 LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_name(tap_get_state()), tap_state_name(path[i]));
 922                                 exit(-1);
 923                         }
 924                         tap_set_state(path[i]);
 925                 }
 926                 num_states -= j;
 927         }
 928
 929         if (num_states > 0)
 930         {
 931                 vsllink_tap_ensure_space(0, num_states);
 932
 933                 for (i = 0; i < num_states; i++)
 934                 {
 935                         if (path[j + i] == tap_state_transition(tap_get_state(), false))
 936                         {
 937                                 vsllink_tap_append_step(0, 0);
 938                         }
 939                         else if (path[j + i] == tap_state_transition(tap_get_state(), true))
 940                         {
 941                                 vsllink_tap_append_step(1, 0);
 942                         }
 943                         else
 944                         {
 945                                 LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_name(tap_get_state()), tap_state_name(path[i]));
 946                                 exit(-1);
 947                         }
 948                         tap_set_state(path[j + i]);
 949                 }
 950         }
 951
 952         tap_set_end_state(tap_get_state());
 953 }
 954
 955 static void vsllink_stableclocks_normal(int num_cycles, int tms)
 956 {
 957         int tms_len;
 958         uint16_t tms_append_byte;
 959
 960         if (vsllink_tms_data_len > 0)
 961         {
 962                 // there are vsllink_tms_data_len more tms bits to be shifted
 963                 // so there are vsllink_tms_data_len + num_cycles tms bits in all
 964                 tms_len = vsllink_tms_data_len + num_cycles;
 965                 if (tms > 0)
 966                 {
 967                         // append '1' for tms
 968                         tms_append_byte = (uint16_t)((((1 << num_cycles) - 1) << vsllink_tms_data_len) & 0xFFFF);
 969                 }
 970                 else
 971                 {
 972                         // append '0' for tms
 973                         tms_append_byte = 0;
 974                 }
 975                 if (tms_len <= 16)
 976                 {
 977                         // merge into last tms shift
 978                         if (tms_len < 8)
 979                         {
 980                                 // just add to vsllink_tms_data_len
 981                                 // same result if tun through
 982                                 //vsllink_tms_data_len += num_cycles;
 983                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] |= (uint8_t)(tms_append_byte & 0xFF);
 984                         }
 985                         else if (tms_len == 8)
 986                         {
 987                                 // end last tms shift command
 988                                 // just reduce it, and append last tms byte
 989                                 (*vsllink_tms_cmd_pos)--;
 990                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (uint8_t)(tms_append_byte & 0xFF);
 991                         }
 992                         else if (tms_len < 16)
 993                         {
 994                                 if ((*vsllink_tms_cmd_pos & VSLLINK_CMDJTAGSEQ_LENMSK) < VSLLINK_CMDJTAGSEQ_LENMSK)
 995                                 {
 996                                         // every tms shift command can contain VSLLINK_CMDJTAGSEQ_LENMSK + 1 bytes in most
 997                                         // there is enought tms length in the current tms shift command
 998                                         // increase the tms byte length by 1 and set the last byte to 0
 999                                         (*vsllink_tms_cmd_pos)++;
1000                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (uint8_t)(tms_append_byte & 0xFF);
1001                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = (uint8_t)(tms_append_byte >> 8);
1002                                 }
1003                                 else
1004                                 {
1005                                         // every tms shift command can contain VSLLINK_CMDJTAGSEQ_LENMSK + 1 bytes in most
1006                                         // not enough tms length in the current tms shift command
1007                                         // so a new command should be added
1008                                         // first decrease byte length of last tms shift command
1009                                         (*vsllink_tms_cmd_pos)--;
1010                                         // append last tms byte and move the command pointer to the next empty position
1011                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (uint8_t)(tms_append_byte & 0xFF);
1012                                         // add new command(3 bytes)
1013                                         vsllink_tap_ensure_space(0, 3);
1014                                         vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
1015                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | 1;
1016                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = (uint8_t)(tms_append_byte >> 8);
1017                                 }
1018                         }
1019                         else if (tms_len == 16)
1020                         {
1021                                 // end last tms shift command
1022                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (uint8_t)(tms_append_byte & 0xFF);
1023                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (uint8_t)(tms_append_byte >> 8);
1024                         }
1025
1026                         vsllink_tms_data_len = tms_len & 7;
1027                         if (vsllink_tms_data_len == 0)
1028                         {
1029                                 vsllink_tms_cmd_pos = NULL;
1030                         }
1031                         num_cycles = 0;
1032                 }
1033                 else
1034                 {
1035                         // more shifts will be needed
1036                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (uint8_t)(tms_append_byte & 0xFF);
1037                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (uint8_t)(tms_append_byte >> 8);
1038
1039                         num_cycles -= 16 - vsllink_tms_data_len;
1040                         vsllink_tms_data_len = 0;
1041                         vsllink_tms_cmd_pos = NULL;
1042                 }
1043         }
1044         // from here vsllink_tms_data_len == 0 or num_cycles == 0
1045
1046         if (vsllink_tms_data_len > 0)
1047         {
1048                 // num_cycles == 0
1049                 // no need to shift
1050                 if (num_cycles > 0)
1051                 {
1052                         LOG_ERROR("There MUST be some bugs in the driver");
1053                         exit(-1);
1054                 }
1055         }
1056         else
1057         {
1058                 // get number of bytes left to be sent
1059                 tms_len = num_cycles >> 3;
1060                 if (tms_len > 0)
1061                 {
1062                         vsllink_tap_ensure_space(1, 5);
1063                         // if tms_len > 0, vsllink_tms_data_len == 0
1064                         // so just add new command
1065                         // LSB of the command byte is the tms value when do the shifting
1066                         if (tms > 0)
1067                         {
1068                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSCLOCK | 1;
1069                         }
1070                         else
1071                         {
1072                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSCLOCK;
1073                         }
1074                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms_len >> 0) & 0xff;
1075                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms_len >> 8) & 0xff;
1076                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms_len >> 16) & 0xff;
1077                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms_len >> 24) & 0xff;
1078
1079                         vsllink_usb_in_want_length += 1;
1080                         pending_scan_results_buffer[pending_scan_results_length].buffer = NULL;
1081                         pending_scan_results_length++;
1082
1083                         if (tms_len > 0xFFFF)
1084                         {
1085                                 vsllink_tap_execute();
1086                         }
1087                 }
1088
1089                 // post-process
1090                 vsllink_tms_data_len = num_cycles & 7;
1091                 if (vsllink_tms_data_len > 0)
1092                 {
1093                         vsllink_tap_ensure_space(0, 3);
1094                         vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
1095                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | 1;
1096                         if (tms > 0)
1097                         {
1098                                 // append '1' for tms
1099                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = (1 << vsllink_tms_data_len) - 1;
1100                         }
1101                         else
1102                         {
1103                                 // append '0' for tms
1104                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = 0x00;
1105                         }
1106                 }
1107         }
1108 }
1109 static void vsllink_stableclocks_dma(int num_cycles, int tms)
1110 {
1111         int i, cur_cycles;
1112
1113         if (tap_length & 7)
1114         {
1115                 if ((8 - (tap_length & 7)) < num_cycles)
1116                 {
1117                         cur_cycles = 8 - (tap_length & 7);
1118                 }
1119                 else
1120                 {
1121                         cur_cycles = num_cycles;
1122                 }
1123                 for (i = 0; i < cur_cycles; i++)
1124                 {
1125                         vsllink_tap_append_step(tms, 0);
1126                 }
1127                 num_cycles -= cur_cycles;
1128         }
1129
1130         while (num_cycles > 0)
1131         {
1132                 if (num_cycles > 8 * tap_buffer_size)
1133                 {
1134                         cur_cycles = 8 * tap_buffer_size;
1135                 }
1136                 else
1137                 {
1138                         cur_cycles = num_cycles;
1139                 }
1140
1141                 vsllink_tap_ensure_space(0, cur_cycles);
1142
1143                 for (i = 0; i < cur_cycles; i++)
1144                 {
1145                         vsllink_tap_append_step(tms, 0);
1146                 }
1147
1148                 num_cycles -= cur_cycles;
1149         }
1150 }
1151
1152 static void vsllink_runtest(int num_cycles)
1153 {
1154         tap_state_t saved_end_state = tap_get_end_state();
1155
1156         if (tap_get_state() != TAP_IDLE)
1157         {
1158                 // enter into IDLE state
1159                 vsllink_end_state(TAP_IDLE);
1160                 vsllink_state_move();
1161         }
1162
1163         vsllink_stableclocks(num_cycles, 0);
1164
1165         // post-process
1166         // set end_state
1167         vsllink_end_state(saved_end_state);
1168         tap_set_state(TAP_IDLE);
1169         if (tap_get_end_state() != TAP_IDLE)
1170         {
1171                 vsllink_state_move();
1172         }
1173 }
1174
1175 static void vsllink_scan_normal(bool ir_scan, enum scan_type type, uint8_t *buffer, int scan_size, scan_command_t *command)
1176 {
1177         tap_state_t saved_end_state;
1178         uint8_t bits_left, tms_tmp, tdi_len;
1179         int i;
1180
1181         if (0 == scan_size )
1182         {
1183                 return;
1184         }
1185
1186         tdi_len = ((scan_size + 7) >> 3);
1187         if ((tdi_len + 7) > VSLLINK_BufferSize)
1188         {
1189                 LOG_ERROR("Your implementation of VSLLink has not enough buffer");
1190                 exit(-1);
1191         }
1192
1193         saved_end_state = tap_get_end_state();
1194
1195         /* Move to appropriate scan state */
1196         vsllink_end_state(ir_scan ? TAP_IRSHIFT : TAP_DRSHIFT);
1197
1198         if (vsllink_tms_data_len > 0)
1199         {
1200                 if (tap_get_state() == tap_get_end_state())
1201                 {
1202                         // already in IRSHIFT or DRSHIFT state
1203                         // merge tms data in the last tms shift command into next scan command
1204                         if(*vsllink_tms_cmd_pos < 1)
1205                         {
1206                                 LOG_ERROR("There MUST be some bugs in the driver");
1207                                 exit(-1);
1208                         }
1209                         else if(*vsllink_tms_cmd_pos < 2)
1210                         {
1211                                 tms_tmp = vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
1212                                 vsllink_usb_out_buffer_idx--;
1213                         }
1214                         else
1215                         {
1216                                 tms_tmp = vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
1217                                 *vsllink_tms_cmd_pos -= 2;
1218                         }
1219
1220                         vsllink_tap_ensure_space(1, tdi_len + 7);
1221                         // VSLLINK_CMDJTAGSEQ_SCAN ored by 1 means that tms_before is valid
1222                         // which is merged from the last tms shift command
1223                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_SCAN | 1;
1224                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = ((tdi_len + 1) >> 0) & 0xff;
1225                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = ((tdi_len + 1) >> 8) & 0xff;
1226                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = tms_tmp;
1227                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = buffer[0] << (8 - vsllink_tms_data_len);
1228
1229                         for (i = 0; i < tdi_len; i++)
1230                         {
1231                                 buffer[i] >>= 8 - vsllink_tms_data_len;
1232                                 if (i != tdi_len)
1233                                 {
1234                                         buffer[i] += buffer[i + 1] << vsllink_tms_data_len;
1235                                 }
1236                         }
1237
1238                         vsllink_tap_append_scan_normal(scan_size - vsllink_tms_data_len, buffer, command, vsllink_tms_data_len);
1239                         scan_size -= 8 - vsllink_tms_data_len;
1240                         vsllink_tms_data_len = 0;
1241                 }
1242                 else
1243                 {
1244                         vsllink_state_move();
1245                         vsllink_tap_ensure_space(1, tdi_len + 5);
1246
1247                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_SCAN;
1248                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tdi_len >> 0) & 0xff;
1249                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tdi_len >> 8) & 0xff;
1250
1251                         vsllink_tap_append_scan_normal(scan_size, buffer, command, 0);
1252                 }
1253         }
1254         else
1255         {
1256                 vsllink_tap_ensure_space(1, tdi_len + 7);
1257
1258                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_SCAN | 1;
1259                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = ((tdi_len + 1) >> 0) & 0xff;
1260                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = ((tdi_len + 1)>> 8) & 0xff;
1261                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
1262                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 0;
1263
1264                 vsllink_tap_append_scan_normal(scan_size, buffer, command, 8);
1265         }
1266         vsllink_end_state(saved_end_state);
1267
1268         bits_left = scan_size & 0x07;
1269         tap_set_state(ir_scan ? TAP_IRPAUSE : TAP_DRPAUSE);
1270
1271         if (bits_left > 0)
1272         {
1273                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 1 << (bits_left - 1);
1274         }
1275         else
1276         {
1277                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 1 << 7;
1278         }
1279
1280         if (tap_get_state() != tap_get_end_state())
1281         {
1282                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
1283         }
1284         else
1285         {
1286                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 0;
1287         }
1288
1289         tap_set_state(tap_get_end_state());
1290 }
1291 static void vsllink_scan_dma(bool ir_scan, enum scan_type type, uint8_t *buffer, int scan_size, scan_command_t *command)
1292 {
1293         tap_state_t saved_end_state;
1294
1295         saved_end_state = tap_get_end_state();
1296
1297         /* Move to appropriate scan state */
1298         vsllink_end_state(ir_scan ? TAP_IRSHIFT : TAP_DRSHIFT);
1299
1300         vsllink_state_move();
1301         vsllink_end_state(saved_end_state);
1302
1303         /* Scan */
1304         vsllink_tap_append_scan_dma(scan_size, buffer, command);
1305
1306         tap_set_state(ir_scan ? TAP_IRPAUSE : TAP_DRPAUSE);
1307         while (tap_length % 8 != 0)
1308         {
1309                 // more 0s in Pause
1310                 vsllink_tap_append_step(0, 0);
1311         }
1312
1313         if (tap_get_state() != tap_get_end_state())
1314         {
1315                 vsllink_state_move();
1316         }
1317 }
1318
1319 static void vsllink_reset(int trst, int srst)
1320 {
1321         int result;
1322
1323         LOG_DEBUG("trst: %i, srst: %i", trst, srst);
1324
1325         /* Signals are active low */
1326         vsllink_usb_out_buffer[0] = VSLLINK_CMD_SET_PORT;
1327         vsllink_usb_out_buffer[1] = JTAG_PINMSK_SRST | JTAG_PINMSK_TRST;
1328         vsllink_usb_out_buffer[2] = 0;
1329         if (srst == 0)
1330         {
1331                 vsllink_usb_out_buffer[2] |= JTAG_PINMSK_SRST;
1332         }
1333         if (trst == 0)
1334         {
1335                 vsllink_usb_out_buffer[2] |= JTAG_PINMSK_TRST;
1336         }
1337
1338         result = vsllink_usb_write(vsllink_jtag_handle, 3);
1339         if (result != 3)
1340         {
1341                 LOG_ERROR("VSLLink command VSLLINK_CMD_SET_PORT failed (%d)", result);
1342         }
1343 }
1344
1345 static void vsllink_simple_command(uint8_t command)
1346 {
1347         int result;
1348
1349         DEBUG_JTAG_IO("0x%02x", command);
1350
1351         vsllink_usb_out_buffer[0] = command;
1352         result = vsllink_usb_write(vsllink_jtag_handle, 1);
1353
1354         if (result != 1)
1355         {
1356                 LOG_ERROR("VSLLink command 0x%02x failed (%d)", command, result);
1357         }
1358 }
1359
1360 static int vsllink_register_commands(struct command_context_s *cmd_ctx)
1361 {
1362         register_command(cmd_ctx, NULL, "vsllink_usb_vid", vsllink_handle_usb_vid_command,
1363                                         COMMAND_CONFIG, NULL);
1364         register_command(cmd_ctx, NULL, "vsllink_usb_pid", vsllink_handle_usb_pid_command,
1365                                         COMMAND_CONFIG, NULL);
1366         register_command(cmd_ctx, NULL, "vsllink_usb_bulkin", vsllink_handle_usb_bulkin_command,
1367                                         COMMAND_CONFIG, NULL);
1368         register_command(cmd_ctx, NULL, "vsllink_usb_bulkout", vsllink_handle_usb_bulkout_command,
1369                                         COMMAND_CONFIG, NULL);
1370         register_command(cmd_ctx, NULL, "vsllink_usb_interface", vsllink_handle_usb_interface_command,
1371                                         COMMAND_CONFIG, NULL);
1372         register_command(cmd_ctx, NULL, "vsllink_mode", vsllink_handle_mode_command,
1373                                         COMMAND_CONFIG, NULL);
1374
1375         return ERROR_OK;
1376 }
1377
1378 static int vsllink_handle_mode_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1379 {
1380         if (argc != 1) {
1381                 LOG_ERROR("parameter error, should be one parameter for VID");
1382                 return ERROR_FAIL;
1383         }
1384
1385         if (!strcmp(args[0], "normal"))
1386         {
1387                 vsllink_mode = VSLLINK_MODE_NORMAL;
1388         }
1389         else if (!strcmp(args[0], "dma"))
1390         {
1391                 vsllink_mode = VSLLINK_MODE_DMA;
1392         }
1393         else
1394         {
1395                 LOG_ERROR("invalid vsllink_mode: %s", args[0]);
1396                 return ERROR_FAIL;
1397         }
1398
1399         return ERROR_OK;
1400 }
1401
1402 static int vsllink_handle_usb_vid_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1403 {
1404         if (argc != 1)
1405         {
1406                 LOG_ERROR("parameter error, should be one parameter for VID");
1407                 return ERROR_OK;
1408         }
1409
1410         return parse_u16(args[0], &vsllink_usb_vid);
1411 }
1412
1413 static int vsllink_handle_usb_pid_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1414 {
1415         if (argc != 1)
1416         {
1417                 LOG_ERROR("parameter error, should be one parameter for PID");
1418                 return ERROR_OK;
1419         }
1420         return parse_u16(args[0], &vsllink_usb_pid);
1421 }
1422
1423 static int vsllink_handle_usb_bulkin_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1424 {
1425         if (argc != 1)
1426         {
1427                 LOG_ERROR("parameter error, should be one parameter for BULKIN endpoint");
1428                 return ERROR_OK;
1429         }
1430
1431         int retval = parse_u8(args[0], &vsllink_usb_bulkin);
1432         if (ERROR_OK == retval)
1433                 vsllink_usb_bulkin |= 0x80;
1434
1435         return retval;
1436 }
1437
1438 static int vsllink_handle_usb_bulkout_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1439 {
1440         if (argc != 1)
1441         {
1442                 LOG_ERROR("parameter error, should be one parameter for BULKOUT endpoint");
1443                 return ERROR_OK;
1444         }
1445
1446         int retval = parse_u8(args[0], &vsllink_usb_bulkout);
1447         if (ERROR_OK == retval)
1448                 vsllink_usb_bulkout &= ~0x80;
1449
1450         return retval;
1451 }
1452
1453 static int vsllink_handle_usb_interface_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1454 {
1455         if (argc != 1)
1456         {
1457                 LOG_ERROR("parameter error, should be one parameter for interface number");
1458                 return ERROR_OK;
1459         }
1460
1461         return parse_u8(args[0], &vsllink_usb_interface);
1462 }
1463
1464 /***************************************************************************/
1465 /* VSLLink tap functions */
1466
1467 static void vsllink_tap_init_normal(void)
1468 {
1469         vsllink_usb_out_buffer_idx = 0;
1470         vsllink_usb_in_want_length = 0;
1471         pending_scan_results_length = 0;
1472 }
1473 static void vsllink_tap_init_dma(void)
1474 {
1475         tap_length = 0;
1476         pending_scan_results_length = 0;
1477 }
1478
1479 static void vsllink_tap_ensure_space_normal(int scans, int length)
1480 {
1481         int available_scans = MAX_PENDING_SCAN_RESULTS - pending_scan_results_length;
1482         int available_bytes = VSLLINK_BufferSize - vsllink_usb_out_buffer_idx;
1483
1484         if (scans > available_scans || length > available_bytes)
1485         {
1486                 vsllink_tap_execute();
1487         }
1488 }
1489 static void vsllink_tap_ensure_space_dma(int scans, int length)
1490 {
1491         int available_scans = MAX_PENDING_SCAN_RESULTS - pending_scan_results_length;
1492         int available_bytes = tap_buffer_size * 8 - tap_length;
1493
1494         if (scans > available_scans || length > available_bytes)
1495         {
1496                 vsllink_tap_execute();
1497         }
1498 }
1499
1500 static void vsllink_tap_append_step(int tms, int tdi)
1501 {
1502         last_tms = tms;
1503         int index = tap_length / 8;
1504
1505         if (index < tap_buffer_size)
1506         {
1507                 int bit_index = tap_length % 8;
1508                 uint8_t bit = 1 << bit_index;
1509
1510                 if (tms)
1511                 {
1512                         tms_buffer[index] |= bit;
1513                 }
1514                 else
1515                 {
1516                         tms_buffer[index] &= ~bit;
1517                 }
1518
1519                 if (tdi)
1520                 {
1521                         tdi_buffer[index] |= bit;
1522                 }
1523                 else
1524                 {
1525                         tdi_buffer[index] &= ~bit;
1526                 }
1527
1528                 tap_length++;
1529         }
1530         else
1531         {
1532                 LOG_ERROR("buffer overflow, tap_length=%d", tap_length);
1533         }
1534 }
1535
1536 static void vsllink_tap_append_scan_normal(int length, uint8_t *buffer, scan_command_t *command, int offset)
1537 {
1538         pending_scan_result_t *pending_scan_result = &pending_scan_results_buffer[pending_scan_results_length];
1539         int i;
1540
1541         if (offset > 0)
1542         {
1543                 vsllink_usb_in_want_length += ((length + 7) >> 3) + 1;
1544         }
1545         else
1546         {
1547                 vsllink_usb_in_want_length += (length + 7) >> 3;
1548         }
1549         pending_scan_result->length = length;
1550         pending_scan_result->offset = offset;
1551         pending_scan_result->command = command;
1552         pending_scan_result->buffer = buffer;
1553
1554         for (i = 0; i < ((length + 7) >> 3); i++)
1555         {
1556                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = buffer[i];
1557         }
1558
1559         pending_scan_results_length++;
1560 }
1561 static void vsllink_tap_append_scan_dma(int length, uint8_t *buffer, scan_command_t *command)
1562 {
1563         pending_scan_result_t *pending_scan_result;
1564         int len_tmp, len_all, i;
1565
1566         len_all = 0;
1567         while (len_all < length)
1568         {
1569                 if ((length - len_all) > tap_buffer_size * 8)
1570                 {
1571                         len_tmp = tap_buffer_size * 8;
1572                 }
1573                 else
1574                 {
1575                         len_tmp = length - len_all;
1576                 }
1577
1578                 vsllink_tap_ensure_space(1, (len_tmp + 7) & ~7);
1579
1580                 pending_scan_result = &pending_scan_results_buffer[pending_scan_results_length];
1581                 pending_scan_result->offset = tap_length;
1582                 pending_scan_result->length = len_tmp;
1583                 pending_scan_result->command = command;
1584                 pending_scan_result->buffer = buffer + len_all / 8;
1585
1586                 for (i = 0; i < len_tmp; i++)
1587                 {
1588                         vsllink_tap_append_step(((len_all+i) < length-1 ? 0 : 1), (buffer[(len_all+i)/8] >> ((len_all+i)%8)) & 1);
1589                 }
1590
1591                 pending_scan_results_length++;
1592                 len_all += len_tmp;
1593         }
1594 }
1595
1596 /* Pad and send a tap sequence to the device, and receive the answer.
1597  * For the purpose of padding we assume that we are in reset or idle or pause state. */
1598 static int vsllink_tap_execute_normal(void)
1599 {
1600         int i;
1601         int result;
1602         int first = 0;
1603
1604         if (vsllink_tms_data_len > 0)
1605         {
1606                 if((tap_get_state() != TAP_RESET) && (tap_get_state() != TAP_IDLE) && (tap_get_state() != TAP_IRPAUSE) && (tap_get_state() != TAP_DRPAUSE))
1607                 {
1608                         LOG_WARNING("%s is not in RESET or IDLE or PAUSR state", tap_state_name(tap_get_state()));
1609                 }
1610
1611                 if (vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] & (1 << (vsllink_tms_data_len - 1)))
1612                 {
1613                         // last tms bit is '1'
1614                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= 0xFF << vsllink_tms_data_len;
1615                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 0xFF;
1616                         vsllink_tms_data_len = 0;
1617                 }
1618                 else
1619                 {
1620                         // last tms bit is '0'
1621                         vsllink_usb_out_buffer_idx++;
1622                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 0;
1623                         vsllink_tms_data_len = 0;
1624                 }
1625         }
1626
1627         if (vsllink_usb_out_buffer_idx > 3)
1628         {
1629                 if (vsllink_usb_out_buffer[0] == VSLLINK_CMD_HW_JTAGSEQCMD)
1630                 {
1631                         vsllink_usb_out_buffer[1] = (vsllink_usb_out_buffer_idx >> 0) & 0xff;
1632                         vsllink_usb_out_buffer[2] = (vsllink_usb_out_buffer_idx >> 8) & 0xff;
1633                 }
1634
1635                 result = vsllink_usb_message(vsllink_jtag_handle, vsllink_usb_out_buffer_idx, vsllink_usb_in_want_length);
1636
1637                 if (result == vsllink_usb_in_want_length)
1638                 {
1639                         for (i = 0; i < pending_scan_results_length; i++)
1640                         {
1641                                 pending_scan_result_t *pending_scan_result = &pending_scan_results_buffer[i];
1642                                 uint8_t *buffer = pending_scan_result->buffer;
1643                                 int length = pending_scan_result->length;
1644                                 int offset = pending_scan_result->offset;
1645                                 scan_command_t *command = pending_scan_result->command;
1646
1647                                 if (buffer != NULL)
1648                                 {
1649                                         // IRSHIFT or DRSHIFT
1650                                         buf_set_buf(vsllink_usb_in_buffer, first * 8 + offset, buffer, 0, length);
1651                                         first += (length + offset + 7) >> 3;
1652
1653                                         DEBUG_JTAG_IO("JTAG scan read(%d bits):", length);
1654 #ifdef _DEBUG_JTAG_IO_
1655                                         vsllink_debug_buffer(buffer, (length + 7) >> 3);
1656 #endif
1657
1658                                         if (jtag_read_buffer(buffer, command) != ERROR_OK)
1659                                         {
1660                                                 vsllink_tap_init();
1661                                                 return ERROR_JTAG_QUEUE_FAILED;
1662                                         }
1663
1664                                         free(pending_scan_result->buffer);
1665                                         pending_scan_result->buffer = NULL;
1666                                 }
1667                                 else
1668                                 {
1669                                         first++;
1670                                 }
1671                         }
1672                 }
1673                 else
1674                 {
1675                         LOG_ERROR("vsllink_tap_execute, wrong result %d, expected %d", result, vsllink_usb_in_want_length);
1676                         return ERROR_JTAG_QUEUE_FAILED;
1677                 }
1678
1679                 vsllink_tap_init();
1680         }
1681         reset_command_pointer();
1682
1683         return ERROR_OK;
1684 }
1685 static int vsllink_tap_execute_dma(void)
1686 {
1687         int byte_length;
1688         int i;
1689         int result;
1690
1691         if (tap_length > 0)
1692         {
1693                 /* Pad last byte so that tap_length is divisible by 8 */
1694                 while (tap_length % 8 != 0)
1695                 {
1696                         /* More of the last TMS value keeps us in the same state,
1697                          * analogous to free-running JTAG interfaces. */
1698                         vsllink_tap_append_step(last_tms, 0);
1699                 }
1700                 byte_length = tap_length / 8;
1701
1702                 vsllink_usb_out_buffer[0] = VSLLINK_CMD_HW_JTAGRAWCMD;
1703                 vsllink_usb_out_buffer[1] = ((byte_length * 2 + 3) >> 0) & 0xff;                // package size
1704                 vsllink_usb_out_buffer[2] = ((byte_length * 2 + 3) >> 8) & 0xff;
1705
1706                 memcpy(&vsllink_usb_out_buffer[3], tdi_buffer, byte_length);
1707                 memcpy(&vsllink_usb_out_buffer[3 + byte_length], tms_buffer, byte_length);
1708
1709                 result = vsllink_usb_message(vsllink_jtag_handle, 3 + 2 * byte_length, byte_length);
1710                 if (result == byte_length)
1711                 {
1712                         for (i = 0; i < pending_scan_results_length; i++)
1713                         {
1714                                 pending_scan_result_t *pending_scan_result = &pending_scan_results_buffer[i];
1715                                 uint8_t *buffer = pending_scan_result->buffer;
1716                                 int length = pending_scan_result->length;
1717                                 int first = pending_scan_result->offset;
1718
1719                                 scan_command_t *command = pending_scan_result->command;
1720                                 buf_set_buf(vsllink_usb_in_buffer, first, buffer, 0, length);
1721
1722                                 DEBUG_JTAG_IO("JTAG scan read(%d bits, from %d bits):", length, first);
1723 #ifdef _DEBUG_JTAG_IO_
1724                                 vsllink_debug_buffer(buffer, (length + 7) >> 3);
1725 #endif
1726
1727                                 if (jtag_read_buffer(buffer, command) != ERROR_OK)
1728                                 {
1729                                         vsllink_tap_init();
1730                                         return ERROR_JTAG_QUEUE_FAILED;
1731                                 }
1732
1733                                 if (pending_scan_result->buffer != NULL)
1734                                 {
1735                                         free(pending_scan_result->buffer);
1736                                 }
1737                         }
1738                 }
1739                 else
1740                 {
1741                         LOG_ERROR("vsllink_tap_execute, wrong result %d, expected %d", result, byte_length);
1742                         return ERROR_JTAG_QUEUE_FAILED;
1743                 }
1744
1745                 vsllink_tap_init();
1746         }
1747
1748         return ERROR_OK;
1749 }
1750
1751 /*****************************************************************************/
1752 /* VSLLink USB low-level functions */
1753
1754 static vsllink_jtag_t* vsllink_usb_open(void)
1755 {
1756         struct usb_bus *busses;
1757         struct usb_bus *bus;
1758         struct usb_device *dev;
1759         int ret;
1760
1761         vsllink_jtag_t *result;
1762
1763         result = (vsllink_jtag_t*) malloc(sizeof(vsllink_jtag_t));
1764
1765         usb_init();
1766         usb_find_busses();
1767         usb_find_devices();
1768
1769         busses = usb_get_busses();
1770
1771         /* find vsllink_jtag device in usb bus */
1772
1773         for (bus = busses; bus; bus = bus->next)
1774         {
1775                 for (dev = bus->devices; dev; dev = dev->next)
1776                 {
1777                         if ((dev->descriptor.idVendor == vsllink_usb_vid) && (dev->descriptor.idProduct == vsllink_usb_pid))
1778                         {
1779                                 result->usb_handle = usb_open(dev);
1780                                 if (NULL == result->usb_handle)
1781                                 {
1782                                         LOG_ERROR("failed to open %04X:%04X, not enough permissions?", vsllink_usb_vid, vsllink_usb_pid);
1783                                         exit(-1);
1784                                 }
1785
1786                                 /* usb_set_configuration required under win32 */
1787                                 ret = usb_set_configuration(result->usb_handle, dev->config[0].bConfigurationValue);
1788                                 if (ret != 0)
1789                                 {
1790                                         LOG_ERROR("fail to set configuration to %d, %d returned, not enough permissions?", dev->config[0].bConfigurationValue, ret);
1791                                         exit(-1);
1792                                 }
1793                                 ret = usb_claim_interface(result->usb_handle, vsllink_usb_interface);
1794                                 if (ret != 0)
1795                                 {
1796                                         LOG_ERROR("fail to claim interface %d, %d returned", vsllink_usb_interface, ret);
1797                                         exit(-1);
1798                                 }
1799
1800 #if 0
1801                                 /*
1802                                  * This makes problems under Mac OS X. And is not needed
1803                                  * under Windows. Hopefully this will not break a linux build
1804                                  */
1805                                 usb_set_altinterface(result->usb_handle, 0);
1806 #endif
1807                                 return result;
1808                         }
1809                 }
1810         }
1811
1812         free(result);
1813         return NULL;
1814 }
1815
1816 static void vsllink_usb_close(vsllink_jtag_t *vsllink_jtag)
1817 {
1818         int ret;
1819
1820         ret = usb_release_interface(vsllink_jtag->usb_handle, vsllink_usb_interface);
1821         if (ret != 0)
1822         {
1823                 LOG_ERROR("fail to release interface %d, %d returned", vsllink_usb_interface, ret);
1824                 exit(-1);
1825         }
1826
1827         ret = usb_close(vsllink_jtag->usb_handle);
1828         if (ret != 0)
1829         {
1830                 LOG_ERROR("fail to close usb, %d returned", ret);
1831                 exit(-1);
1832         }
1833
1834         free(vsllink_jtag);
1835 }
1836
1837 /* Send a message and receive the reply. */
1838 static int vsllink_usb_message(vsllink_jtag_t *vsllink_jtag, int out_length, int in_length)
1839 {
1840         int result;
1841
1842         result = vsllink_usb_write(vsllink_jtag, out_length);
1843         if (result == out_length)
1844         {
1845                 if (in_length > 0)
1846                 {
1847                         result = vsllink_usb_read(vsllink_jtag);
1848                         if (result == in_length )
1849                         {
1850                                 return result;
1851                         }
1852                         else
1853                         {
1854                                 LOG_ERROR("usb_bulk_read failed (requested=%d, result=%d)", in_length, result);
1855                                 return -1;
1856                         }
1857                 }
1858                 return 0;
1859         }
1860         else
1861         {
1862                 LOG_ERROR("usb_bulk_write failed (requested=%d, result=%d)", out_length, result);
1863                 return -1;
1864         }
1865 }
1866
1867 /* Write data from out_buffer to USB. */
1868 static int vsllink_usb_write(vsllink_jtag_t *vsllink_jtag, int out_length)
1869 {
1870         int result;
1871
1872         if (out_length > VSLLINK_BufferSize)
1873         {
1874                 LOG_ERROR("vsllink_jtag_write illegal out_length=%d (max=%d)", out_length, VSLLINK_BufferSize);
1875                 return -1;
1876         }
1877
1878         result = usb_bulk_write(vsllink_jtag->usb_handle, vsllink_usb_bulkout, \
1879                 (char *)vsllink_usb_out_buffer, out_length, VSLLINK_USB_TIMEOUT);
1880
1881         DEBUG_JTAG_IO("vsllink_usb_write, out_length = %d, result = %d", out_length, result);
1882
1883 #ifdef _DEBUG_USB_COMMS_
1884         LOG_DEBUG("USB out:");
1885         vsllink_debug_buffer(vsllink_usb_out_buffer, out_length);
1886 #endif
1887
1888 #ifdef _VSLLINK_IN_DEBUG_MODE_
1889         usleep(100000);
1890 #endif
1891
1892         return result;
1893 }
1894
1895 /* Read data from USB into in_buffer. */
1896 static int vsllink_usb_read(vsllink_jtag_t *vsllink_jtag)
1897 {
1898         int result = usb_bulk_read(vsllink_jtag->usb_handle, vsllink_usb_bulkin, \
1899                 (char *)vsllink_usb_in_buffer, VSLLINK_BufferSize, VSLLINK_USB_TIMEOUT);
1900
1901         DEBUG_JTAG_IO("vsllink_usb_read, result = %d", result);
1902
1903 #ifdef _DEBUG_USB_COMMS_
1904         LOG_DEBUG("USB in:");
1905         vsllink_debug_buffer(vsllink_usb_in_buffer, result);
1906 #endif
1907         return result;
1908 }
1909
1910 #define BYTES_PER_LINE  16
1911
1912 #if defined _DEBUG_USB_COMMS_ || defined _DEBUG_JTAG_IO_
1913 static void vsllink_debug_buffer(uint8_t *buffer, int length)
1914 {
1915         char line[81];
1916         char s[4];
1917         int i;
1918         int j;
1919
1920         for (i = 0; i < length; i += BYTES_PER_LINE)
1921         {
1922                 snprintf(line, 5, "%04x", i);
1923                 for (j = i; j < i + BYTES_PER_LINE && j < length; j++)
1924                 {
1925                         snprintf(s, 4, " %02x", buffer[j]);
1926                         strcat(line, s);
1927                 }
1928                 LOG_DEBUG("%s", line);
1929         }
1930 }
1931 #endif // _DEBUG_USB_COMMS_ || _DEBUG_JTAG_IO_