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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 "jtag.h"
  30
  31 #include <usb.h>
  32
  33
  34 //#define _VSLLINK_IN_DEBUG_MODE_
  35
  36 #define VSLLINK_MODE_NORMAL                     0
  37 #define VSLLINK_MODE_DMA                        1
  38
  39 static u16 vsllink_usb_vid;
  40 static u16 vsllink_usb_pid;
  41 static u8 vsllink_usb_bulkout;
  42 static u8 vsllink_usb_bulkin;
  43 static u8 vsllink_usb_interface;
  44 static u8 vsllink_mode = VSLLINK_MODE_NORMAL;
  45 static int VSLLINK_USB_TIMEOUT = 10000;
  46
  47 static int VSLLINK_BufferSize = 1024;
  48
  49 /* Global USB buffers */
  50 static int vsllink_usb_out_buffer_idx;
  51 static int vsllink_usb_in_want_length;
  52 static u8* vsllink_usb_in_buffer = NULL;
  53 static u8* vsllink_usb_out_buffer = NULL;
  54
  55 /* Constants for VSLLink command */
  56 #define VSLLINK_CMD_CONN                        0x80
  57 #define VSLLINK_CMD_DISCONN                     0x81
  58 #define VSLLINK_CMD_SET_SPEED           0x82
  59 #define VSLLINK_CMD_SET_PORT            0x90
  60 #define VSLLINK_CMD_GET_PORT            0x91
  61 #define VSLLINK_CMD_SET_PORTDIR         0x92
  62 #define VSLLINK_CMD_HW_JTAGSEQCMD       0xA0
  63 #define VSLLINK_CMD_HW_JTAGHLCMD        0xA1
  64 #define VSLLINK_CMD_HW_SWDCMD           0xA2
  65 #define VSLLINK_CMD_HW_JTAGRAWCMD       0xA3
  66
  67 #define VSLLINK_CMDJTAGSEQ_TMSBYTE      0x00
  68 #define VSLLINK_CMDJTAGSEQ_TMSCLOCK     0x40
  69 #define VSLLINK_CMDJTAGSEQ_SCAN         0x80
  70
  71 #define VSLLINK_CMDJTAGSEQ_CMDMSK       0xC0
  72 #define VSLLINK_CMDJTAGSEQ_LENMSK       0x3F
  73
  74 #define JTAG_PINMSK_SRST                        (1 << 0)
  75 #define JTAG_PINMSK_TRST                        (1 << 1)
  76 #define JTAG_PINMSK_USR1                        (1 << 2)
  77 #define JTAG_PINMSK_USR2                        (1 << 3)
  78 #define JTAG_PINMSK_TCK                         (1 << 4)
  79 #define JTAG_PINMSK_TMS                         (1 << 5)
  80 #define JTAG_PINMSK_TDI                         (1 << 6)
  81 #define JTAG_PINMSK_TDO                         (1 << 7)
  82
  83
  84 #define VSLLINK_TAP_MOVE(from, to)      VSLLINK_tap_move[tap_move_ndx(from)][tap_move_ndx(to)]
  85
  86 /* VSLLINK_tap_move[i][j]: tap movement command to go from state i to state j
  87  * 0: Test-Logic-Reset
  88  * 1: Run-Test/Idle
  89  * 2: Shift-DR
  90  * 3: Pause-DR
  91  * 4: Shift-IR
  92  * 5: Pause-IR
  93  *
  94  * SD->SD and SI->SI have to be caught in interface specific code
  95  */
  96 static u8 VSLLINK_tap_move[6][6] =
  97 {
  98 /*        TLR   RTI   SD    PD    SI    PI             */
  99         {0xff, 0x7f, 0x2f, 0x0a, 0x37, 0x16},   /* TLR */
 100         {0xff, 0x00, 0x45, 0x05, 0x4b, 0x0b},   /* RTI */
 101         {0xff, 0x61, 0x00, 0x01, 0x0f, 0x2f},   /* SD  */
 102         {0xfe, 0x60, 0x40, 0x5c, 0x3c, 0x5e},   /* PD  */
 103         {0xff, 0x61, 0x07, 0x17, 0x00, 0x01},   /* SI  */
 104         {0xfe, 0x60, 0x38, 0x5c, 0x40, 0x5e}    /* PI  */
 105 };
 106
 107 typedef struct insert_insignificant_operation
 108 {
 109         unsigned char insert_value;
 110         unsigned char insert_position;
 111 }insert_insignificant_operation_t;
 112
 113 static insert_insignificant_operation_t VSLLINK_TAP_MOVE_INSERT_INSIGNIFICANT[6][6] =
 114 {
 115 /*       stuff  offset   */
 116         {/*     TLR     */
 117         {1,             0,},    /* TLR */
 118         {1,             0,},    /* RTI */
 119         {1,             0,},    /* SD  */
 120         {1,             0,},    /* PD  */
 121         {1,             0,},    /* SI  */
 122         {1,             0,}},   /* PI  */
 123         {/*     RTI     */
 124         {1,             0,},    /* TLR */
 125         {0,             0,},    /* RTI */
 126         {0,             4,},    /* SD  */
 127         {0,             7,},    /* PD  */
 128         {0,             5,},    /* SI  */
 129         {0,             7,}},   /* PI  */
 130         {/*     SD      */
 131         {0,             0,},    /* TLR */
 132         {0,             0,},    /* RTI */
 133         {0,             0,},    /* SD  */
 134         {0,             0,},    /* PD  */
 135         {0,             0,},    /* SI  */
 136         {0,             0,}},   /* PI  */
 137         {/*     PD      */
 138         {0,             0,},    /* TLR */
 139         {0,             0,},    /* RTI */
 140         {0,             0,},    /* SD  */
 141         {0,             0,},    /* PD  */
 142         {0,             0,},    /* SI  */
 143         {0,             0,}},   /* PI  */
 144         {/*     SI      */
 145         {0,             0,},    /* TLR */
 146         {0,             0,},    /* RTI */
 147         {0,             0,},    /* SD  */
 148         {0,             0,},    /* PD  */
 149         {0,             0,},    /* SI  */
 150         {0,             0,}},   /* PI  */
 151         {/*     PI      */
 152         {0,             0,},    /* TLR */
 153         {0,             0,},    /* RTI */
 154         {0,             0,},    /* SD  */
 155         {0,             0,},    /* PD  */
 156         {0,             0,},    /* SI  */
 157         {0,             0,}},   /* PI  */
 158 };
 159
 160 static u8 VSLLINK_BIT_MSK[8] =
 161 {
 162         0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f
 163 };
 164
 165 typedef struct
 166 {
 167         int offset;
 168         int length; /* Number of bits to read */
 169         scan_command_t *command; /* Corresponding scan command */
 170         u8 *buffer;
 171 } pending_scan_result_t;
 172
 173 #define MAX_PENDING_SCAN_RESULTS 256
 174
 175 static int pending_scan_results_length;
 176 static pending_scan_result_t pending_scan_results_buffer[MAX_PENDING_SCAN_RESULTS];
 177
 178 /* External interface functions */
 179 static int vsllink_execute_queue(void);
 180 static int vsllink_speed(int speed);
 181 static int vsllink_khz(int khz, int *jtag_speed);
 182 static int vsllink_speed_div(int jtag_speed, int *khz);
 183 static int vsllink_register_commands(struct command_context_s *cmd_ctx);
 184 static int vsllink_init(void);
 185 static int vsllink_quit(void);
 186
 187 /* CLI command handler functions */
 188 static int vsllink_handle_usb_vid_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 189 static int vsllink_handle_usb_pid_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 190 static int vsllink_handle_usb_bulkin_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 191 static int vsllink_handle_usb_bulkout_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 192 static int vsllink_handle_usb_interface_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 193 static int vsllink_handle_mode_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 194
 195 /* Queue command functions */
 196 static void vsllink_end_state(tap_state_t state);
 197 static void vsllink_state_move_dma(void);
 198 static void vsllink_state_move_normal(void);
 199 static void (*vsllink_state_move)(void);
 200 static void vsllink_path_move_dma(int num_states, tap_state_t *path);
 201 static void vsllink_path_move_normal(int num_states, tap_state_t *path);
 202 static void (*vsllink_path_move)(int num_states, tap_state_t *path);
 203 static void vsllink_runtest(int num_cycles);
 204 static void vsllink_stableclocks_dma(int num_cycles, int tms);
 205 static void vsllink_stableclocks_normal(int num_cycles, int tms);
 206 static void (*vsllink_stableclocks)(int num_cycles, int tms);
 207 static void vsllink_scan_dma(bool ir_scan, enum scan_type type, u8 *buffer, int scan_size, scan_command_t *command);
 208 static void vsllink_scan_normal(bool ir_scan, enum scan_type type, u8 *buffer, int scan_size, scan_command_t *command);
 209 static void (*vsllink_scan)(bool ir_scan, enum scan_type type, u8 *buffer, int scan_size, scan_command_t *command);
 210 static void vsllink_reset(int trst, int srst);
 211 static void vsllink_simple_command(u8 command);
 212 static int vsllink_connect(void);
 213 static int vsllink_disconnect(void);
 214
 215 /* VSLLink tap buffer functions */
 216 static void vsllink_tap_append_step(int tms, int tdi);
 217 static void vsllink_tap_init_dma(void);
 218 static void vsllink_tap_init_normal(void);
 219 static void (*vsllink_tap_init)(void);
 220 static int vsllink_tap_execute_dma(void);
 221 static int vsllink_tap_execute_normal(void);
 222 static int (*vsllink_tap_execute)(void);
 223 static void vsllink_tap_ensure_space_dma(int scans, int length);
 224 static void vsllink_tap_ensure_space_normal(int scans, int length);
 225 static void (*vsllink_tap_ensure_space)(int scans, int length);
 226 static void vsllink_tap_append_scan_dma(int length, u8 *buffer, scan_command_t *command);
 227 static void vsllink_tap_append_scan_normal(int length, u8 *buffer, scan_command_t *command, int offset);
 228
 229 /* VSLLink lowlevel functions */
 230 typedef struct vsllink_jtag
 231 {
 232         struct usb_dev_handle* usb_handle;
 233 } vsllink_jtag_t;
 234
 235 static vsllink_jtag_t *vsllink_usb_open(void);
 236 static void vsllink_usb_close(vsllink_jtag_t *vsllink_jtag);
 237 static int vsllink_usb_message(vsllink_jtag_t *vsllink_jtag, int out_length, int in_length);
 238 static int vsllink_usb_write(vsllink_jtag_t *vsllink_jtag, int out_length);
 239 static int vsllink_usb_read(vsllink_jtag_t *vsllink_jtag);
 240
 241 #if defined _DEBUG_USB_COMMS_ || defined _DEBUG_JTAG_IO_
 242 static void vsllink_debug_buffer(u8 *buffer, int length);
 243 #endif
 244
 245 static int vsllink_tms_data_len = 0;
 246 static u8* vsllink_tms_cmd_pos;
 247
 248 static int tap_length = 0;
 249 static int tap_buffer_size = 0;
 250 static u8 *tms_buffer = NULL;
 251 static u8 *tdi_buffer = NULL;
 252 static u8 *tdo_buffer = NULL;
 253 static int last_tms;
 254
 255 static vsllink_jtag_t* vsllink_jtag_handle = NULL;
 256
 257 /***************************************************************************/
 258 /* External interface implementation */
 259
 260 jtag_interface_t vsllink_interface =
 261 {
 262         .name = "vsllink",
 263         .execute_queue = vsllink_execute_queue,
 264         .speed = vsllink_speed,
 265         .khz = vsllink_khz,
 266         .speed_div = vsllink_speed_div,
 267         .register_commands = vsllink_register_commands,
 268         .init = vsllink_init,
 269         .quit = vsllink_quit
 270 };
 271
 272 static void reset_command_pointer(void)
 273 {
 274         if (vsllink_mode == VSLLINK_MODE_NORMAL)
 275         {
 276                 vsllink_usb_out_buffer[0] = VSLLINK_CMD_HW_JTAGSEQCMD;
 277                 vsllink_usb_out_buffer_idx = 3;
 278         }
 279         else
 280         {
 281                 tap_length = 0;
 282         }
 283 }
 284
 285 static int vsllink_execute_queue(void)
 286 {
 287         jtag_command_t *cmd = jtag_command_queue;
 288         int scan_size;
 289         enum scan_type type;
 290         u8 *buffer;
 291
 292         DEBUG_JTAG_IO("--------------------------------- vsllink -------------------------------------");
 293
 294         reset_command_pointer();
 295         while (cmd != NULL)
 296         {
 297                 switch (cmd->type)
 298                 {
 299                         case JTAG_RUNTEST:
 300                                 DEBUG_JTAG_IO( "runtest %i cycles, end in %s", cmd->cmd.runtest->num_cycles, \
 301                                         tap_state_name(cmd->cmd.runtest->end_state));
 302
 303                                 if (cmd->cmd.runtest->end_state != TAP_INVALID)
 304                                 {
 305                                         vsllink_end_state(cmd->cmd.runtest->end_state);
 306                                 }
 307                                 vsllink_runtest(cmd->cmd.runtest->num_cycles);
 308                                 break;
 309
 310                         case JTAG_STATEMOVE:
 311                                 DEBUG_JTAG_IO("statemove end in %s", tap_state_name(cmd->cmd.statemove->end_state));
 312
 313                                 if (cmd->cmd.statemove->end_state != TAP_INVALID)
 314                                 {
 315                                         vsllink_end_state(cmd->cmd.statemove->end_state);
 316                                 }
 317                                 vsllink_state_move();
 318                                 break;
 319
 320                         case JTAG_PATHMOVE:
 321                                 DEBUG_JTAG_IO("pathmove: %i states, end in %s", \
 322                                         cmd->cmd.pathmove->num_states, \
 323                                         tap_state_name(cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]));
 324
 325                                 vsllink_path_move(cmd->cmd.pathmove->num_states, cmd->cmd.pathmove->path);
 326                                 break;
 327
 328                         case JTAG_SCAN:
 329                                 if (cmd->cmd.scan->end_state != TAP_INVALID)
 330                                 {
 331                                         vsllink_end_state(cmd->cmd.scan->end_state);
 332                                 }
 333
 334                                 scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
 335                                 if (cmd->cmd.scan->ir_scan)
 336                                 {
 337                                         DEBUG_JTAG_IO("JTAG Scan write IR(%d bits), end in %s:", scan_size, tap_state_name(cmd->cmd.scan->end_state));
 338                                 }
 339                                 else
 340                                 {
 341                                         DEBUG_JTAG_IO("JTAG Scan write DR(%d bits), end in %s:", scan_size, tap_state_name(cmd->cmd.scan->end_state));
 342                                 }
 343
 344 #ifdef _DEBUG_JTAG_IO_
 345                                 vsllink_debug_buffer(buffer, (scan_size + 7) >> 3);
 346 #endif
 347
 348                                 type = jtag_scan_type(cmd->cmd.scan);
 349
 350                                 vsllink_scan(cmd->cmd.scan->ir_scan, type, buffer, scan_size, cmd->cmd.scan);
 351                                 break;
 352
 353                         case JTAG_RESET:
 354                                 DEBUG_JTAG_IO("reset trst: %i srst %i", cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 355
 356                                 vsllink_tap_execute();
 357
 358                                 if (cmd->cmd.reset->trst == 1)
 359                                 {
 360                                         tap_set_state(TAP_RESET);
 361                                 }
 362                                 vsllink_reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 363                                 break;
 364
 365                         case JTAG_SLEEP:
 366                                 DEBUG_JTAG_IO("sleep %i", cmd->cmd.sleep->us);
 367                                 vsllink_tap_execute();
 368                                 jtag_sleep(cmd->cmd.sleep->us);
 369                                 break;
 370
 371                         case JTAG_STABLECLOCKS:
 372                                 DEBUG_JTAG_IO("add %d clocks", cmd->cmd.stableclocks->num_cycles);
 373                                 switch(tap_get_state())
 374                                 {
 375                                 case TAP_RESET:
 376                                         // tms should be '1' to stay in TAP_RESET mode
 377                                         scan_size = 1;
 378                                         break;
 379                                 case TAP_DRSHIFT:
 380                                 case TAP_IDLE:
 381                                 case TAP_DRPAUSE:
 382                                 case TAP_IRSHIFT:
 383                                 case TAP_IRPAUSE:
 384                                         // in other mode, tms should be '0'
 385                                         scan_size = 0;
 386                                         break;                  /* above stable states are OK */
 387                                 default:
 388                                          LOG_ERROR( "jtag_add_clocks() was called with TAP in non-stable state \"%s\"",
 389                                                          tap_state_name(tap_get_state()) );
 390                                          exit(-1);
 391                                 }
 392                                 vsllink_stableclocks(cmd->cmd.stableclocks->num_cycles, scan_size);
 393                                 break;
 394
 395                         default:
 396                                 LOG_ERROR("BUG: unknown JTAG command type encountered: %d", cmd->type);
 397                                 exit(-1);
 398                 }
 399                 cmd = cmd->next;
 400         }
 401
 402         return vsllink_tap_execute();
 403 }
 404
 405 static int vsllink_speed(int speed)
 406 {
 407         int result;
 408
 409         vsllink_usb_out_buffer[0] = VSLLINK_CMD_SET_SPEED;
 410         vsllink_usb_out_buffer[1] = (speed >> 0) & 0xff;
 411         vsllink_usb_out_buffer[2] = (speed >> 8) & 0xFF;
 412
 413         result = vsllink_usb_write(vsllink_jtag_handle, 3);
 414
 415         if (result == 3)
 416         {
 417                 return ERROR_OK;
 418         }
 419         else
 420         {
 421                 LOG_ERROR("VSLLink setting speed failed (%d)", result);
 422                 return ERROR_JTAG_DEVICE_ERROR;
 423         }
 424
 425         return ERROR_OK;
 426 }
 427
 428 static int vsllink_khz(int khz, int *jtag_speed)
 429 {
 430         *jtag_speed = khz;
 431
 432         return ERROR_OK;
 433 }
 434
 435 static int vsllink_speed_div(int jtag_speed, int *khz)
 436 {
 437         *khz = jtag_speed;
 438
 439         return ERROR_OK;
 440 }
 441
 442 static int vsllink_init(void)
 443 {
 444         int check_cnt, to_tmp;
 445         int result;
 446         char version_str[100];
 447
 448         vsllink_usb_in_buffer = malloc(VSLLINK_BufferSize);
 449         vsllink_usb_out_buffer = malloc(VSLLINK_BufferSize);
 450         if ((vsllink_usb_in_buffer == NULL) || (vsllink_usb_out_buffer == NULL))
 451         {
 452                 LOG_ERROR("Not enough memory");
 453                 exit(-1);
 454         }
 455
 456         vsllink_jtag_handle = vsllink_usb_open();
 457
 458         if (vsllink_jtag_handle == 0)
 459         {
 460                 LOG_ERROR("Can't find USB JTAG Interface! Please check connection and permissions.");
 461                 return ERROR_JTAG_INIT_FAILED;
 462         }
 463         LOG_DEBUG("vsllink found on %04X:%04X", vsllink_usb_vid, vsllink_usb_pid);
 464
 465         to_tmp = VSLLINK_USB_TIMEOUT;
 466         VSLLINK_USB_TIMEOUT = 100;
 467         check_cnt = 0;
 468         while (check_cnt < 5)
 469         {
 470                 vsllink_simple_command(0x00);
 471                 result = vsllink_usb_read(vsllink_jtag_handle);
 472
 473                 if (result > 2)
 474                 {
 475                         vsllink_usb_in_buffer[result] = 0;
 476                         VSLLINK_BufferSize = vsllink_usb_in_buffer[0] + (vsllink_usb_in_buffer[1] << 8);
 477                         strncpy(version_str, (char *)vsllink_usb_in_buffer + 2, sizeof(version_str));
 478                         LOG_INFO("%s", version_str);
 479
 480                         // free the pre-alloc memroy
 481                         free(vsllink_usb_in_buffer);
 482                         free(vsllink_usb_out_buffer);
 483                         vsllink_usb_in_buffer = NULL;
 484                         vsllink_usb_out_buffer = NULL;
 485
 486                         // alloc new memory
 487                         vsllink_usb_in_buffer = malloc(VSLLINK_BufferSize);
 488                         vsllink_usb_out_buffer = malloc(VSLLINK_BufferSize);
 489                         if ((vsllink_usb_in_buffer == NULL) || (vsllink_usb_out_buffer == NULL))
 490                         {
 491                                 LOG_ERROR("Not enough memory");
 492                                 exit(-1);
 493                         }
 494                         else
 495                         {
 496                                 LOG_INFO("buffer size for USB is %d bytes", VSLLINK_BufferSize);
 497                         }
 498                         // alloc memory for dma mode
 499                         if (vsllink_mode == VSLLINK_MODE_DMA)
 500                         {
 501                                 tap_buffer_size = (VSLLINK_BufferSize - 3) / 2;
 502                                 tms_buffer = (u8*)malloc(tap_buffer_size);
 503                                 tdi_buffer = (u8*)malloc(tap_buffer_size);
 504                                 tdo_buffer = (u8*)malloc(tap_buffer_size);
 505                                 if ((tms_buffer == NULL) || (tdi_buffer == NULL) || (tdo_buffer == NULL))
 506                                 {
 507                                         LOG_ERROR("Not enough memory");
 508                                         exit(-1);
 509                                 }
 510                         }
 511                         break;
 512                 }
 513                 vsllink_simple_command(VSLLINK_CMD_DISCONN);
 514                 check_cnt++;
 515         }
 516         if (check_cnt == 3)
 517         {
 518                 // It's dangerout to proced
 519                 LOG_ERROR("VSLLink initial failed");
 520                 exit(-1);
 521         }
 522         VSLLINK_USB_TIMEOUT = to_tmp;
 523
 524         // connect to vsllink
 525         vsllink_connect();
 526         // initialize function pointers
 527         if (vsllink_mode == VSLLINK_MODE_NORMAL)
 528         {
 529                 // normal mode
 530                 vsllink_state_move = vsllink_state_move_normal;
 531                 vsllink_path_move = vsllink_path_move_normal;
 532                 vsllink_stableclocks = vsllink_stableclocks_normal;
 533                 vsllink_scan = vsllink_scan_normal;
 534
 535                 vsllink_tap_init = vsllink_tap_init_normal;
 536                 vsllink_tap_execute = vsllink_tap_execute_normal;
 537                 vsllink_tap_ensure_space = vsllink_tap_ensure_space_normal;
 538
 539                 LOG_INFO("vsllink run in NORMAL mode");
 540         }
 541         else
 542         {
 543                 // dma mode
 544                 vsllink_state_move = vsllink_state_move_dma;
 545                 vsllink_path_move = vsllink_path_move_dma;
 546                 vsllink_stableclocks = vsllink_stableclocks_dma;
 547                 vsllink_scan = vsllink_scan_dma;
 548
 549                 vsllink_tap_init = vsllink_tap_init_dma;
 550                 vsllink_tap_execute = vsllink_tap_execute_dma;
 551                 vsllink_tap_ensure_space = vsllink_tap_ensure_space_dma;
 552
 553                 LOG_INFO("vsllink run in DMA mode");
 554         }
 555
 556         // Set SRST and TRST to output, Set USR1 and USR2 to input
 557         vsllink_usb_out_buffer[0] = VSLLINK_CMD_SET_PORTDIR;
 558         vsllink_usb_out_buffer[1] = JTAG_PINMSK_SRST | JTAG_PINMSK_TRST | JTAG_PINMSK_USR1 | JTAG_PINMSK_USR2;
 559         vsllink_usb_out_buffer[2] = JTAG_PINMSK_SRST | JTAG_PINMSK_TRST;
 560         if (vsllink_usb_write(vsllink_jtag_handle, 3) != 3)
 561         {
 562                 LOG_ERROR("VSLLink USB send data error");
 563                 exit(-1);
 564         }
 565
 566         vsllink_reset(0, 0);
 567
 568         LOG_INFO("VSLLink JTAG Interface ready");
 569
 570         vsllink_tap_init();
 571
 572         return ERROR_OK;
 573 }
 574
 575 static int vsllink_quit(void)
 576 {
 577         if ((vsllink_usb_in_buffer != NULL) && (vsllink_usb_out_buffer != NULL))
 578         {
 579                 // Set all pins to input
 580                 vsllink_usb_out_buffer[0] = VSLLINK_CMD_SET_PORTDIR;
 581                 vsllink_usb_out_buffer[1] = JTAG_PINMSK_SRST | JTAG_PINMSK_TRST | JTAG_PINMSK_USR1 | JTAG_PINMSK_USR2;
 582                 vsllink_usb_out_buffer[2] = 0;
 583                 if (vsllink_usb_write(vsllink_jtag_handle, 3) != 3)
 584                 {
 585                         LOG_ERROR("VSLLink USB send data error");
 586                         exit(-1);
 587                 }
 588
 589                 // disconnect
 590                 vsllink_disconnect();
 591                 vsllink_usb_close(vsllink_jtag_handle);
 592                 vsllink_jtag_handle = NULL;
 593         }
 594
 595         if (vsllink_usb_in_buffer != NULL)
 596         {
 597                 free(vsllink_usb_in_buffer);
 598                 vsllink_usb_in_buffer = NULL;
 599         }
 600         if (vsllink_usb_out_buffer != NULL)
 601         {
 602                 free(vsllink_usb_out_buffer);
 603                 vsllink_usb_out_buffer = NULL;
 604         }
 605
 606         return ERROR_OK;
 607 }
 608
 609 /***************************************************************************/
 610 /* Queue command implementations */
 611 static int vsllink_disconnect(void)
 612 {
 613         vsllink_simple_command(VSLLINK_CMD_DISCONN);
 614         return ERROR_OK;
 615 }
 616
 617 static int vsllink_connect(void)
 618 {
 619         char vsllink_str[100];
 620
 621         vsllink_usb_out_buffer[0] = VSLLINK_CMD_CONN;
 622         vsllink_usb_out_buffer[1] = vsllink_mode;
 623         vsllink_usb_message(vsllink_jtag_handle, 2, 0);
 624         if (vsllink_usb_read(vsllink_jtag_handle) > 2)
 625         {
 626                 strncpy(vsllink_str, (char *)vsllink_usb_in_buffer + 2, sizeof(vsllink_str));
 627                 LOG_INFO("%s", vsllink_str);
 628         }
 629
 630         return ERROR_OK;
 631 }
 632
 633 // when vsllink_tms_data_len > 0, vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] is the byte that need to be appended.
 634 // length of VSLLINK_CMDJTAGSEQ_TMSBYTE has been set, no need to set it here.
 635 static void vsllink_append_tms(void)
 636 {
 637         u8 tms_scan = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
 638         u16 tms2;
 639         insert_insignificant_operation_t *insert = \
 640                 &VSLLINK_TAP_MOVE_INSERT_INSIGNIFICANT[tap_move_ndx(tap_get_state())][tap_move_ndx(tap_get_end_state())];
 641
 642         if (((tap_get_state() != TAP_RESET) && (tap_get_state() != TAP_IDLE) && (tap_get_state() != TAP_DRPAUSE) && (tap_get_state() != TAP_IRPAUSE)) || \
 643                         (vsllink_tms_data_len <= 0) || (vsllink_tms_data_len >= 8) || \
 644                         (vsllink_tms_cmd_pos == NULL))
 645         {
 646                 LOG_ERROR("There MUST be some bugs in the driver");
 647                 exit(-1);
 648         }
 649
 650         tms2 = (tms_scan & VSLLINK_BIT_MSK[insert->insert_position]) << \
 651                                 vsllink_tms_data_len;
 652         if (insert->insert_value == 1)
 653         {
 654                 tms2 |= VSLLINK_BIT_MSK[8 - vsllink_tms_data_len] << \
 655                                 (vsllink_tms_data_len + insert->insert_position);
 656         }
 657         tms2 |= (tms_scan >> insert->insert_position) << \
 658                                 (8 + insert->insert_position);
 659
 660         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (tms2 >> 0) & 0xff;
 661         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms2 >> 8) & 0xff;
 662
 663         vsllink_tms_data_len = 0;
 664         vsllink_tms_cmd_pos = NULL;
 665 }
 666
 667 static void vsllink_end_state(tap_state_t state)
 668 {
 669         if (tap_is_state_stable(state))
 670         {
 671                 tap_set_end_state(state);
 672         }
 673         else
 674         {
 675                 LOG_ERROR("BUG: %i is not a valid end state", state);
 676                 exit(-1);
 677         }
 678 }
 679
 680 /* Goes to the end state. */
 681 static void vsllink_state_move_normal(void)
 682 {
 683         if (vsllink_tms_data_len > 0)
 684         {
 685                 vsllink_append_tms();
 686         }
 687         else
 688         {
 689                 vsllink_tap_ensure_space(0, 2);
 690
 691                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE;
 692                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
 693         }
 694
 695         tap_set_state(tap_get_end_state());
 696 }
 697 static void vsllink_state_move_dma(void)
 698 {
 699         int i, insert_length = (tap_length % 8) ? (8 - (tap_length % 8)) : 0;
 700         insert_insignificant_operation_t *insert = \
 701                 &VSLLINK_TAP_MOVE_INSERT_INSIGNIFICANT[tap_move_ndx(tap_get_state())][tap_move_ndx(tap_get_end_state())];
 702         u8 tms_scan = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
 703
 704         if (tap_get_state() == TAP_RESET)
 705         {
 706                 vsllink_tap_ensure_space(0, 8);
 707
 708                 for (i = 0; i < 8; i++)
 709                 {
 710                         vsllink_tap_append_step(1, 0);
 711                 }
 712         }
 713
 714         if (insert_length > 0)
 715         {
 716                 vsllink_tap_ensure_space(0, 16);
 717
 718                 for (i = 0; i < insert->insert_position; i++)
 719                 {
 720                         vsllink_tap_append_step((tms_scan >> i) & 1, 0);
 721                 }
 722                 for (i = 0; i < insert_length; i++)
 723                 {
 724                         vsllink_tap_append_step(insert->insert_value, 0);
 725                 }
 726                 for (i = insert->insert_position; i < 8; i++)
 727                 {
 728                         vsllink_tap_append_step((tms_scan >> i) & 1, 0);
 729                 }
 730         }
 731         else
 732         {
 733                 vsllink_tap_ensure_space(0, 8);
 734
 735                 for (i = 0; i < 8; i++)
 736                 {
 737                         vsllink_tap_append_step((tms_scan >> i) & 1, 0);
 738                 }
 739         }
 740
 741         tap_set_state(tap_get_end_state());
 742 }
 743
 744 // write tms from current vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx]
 745 static void vsllink_add_path(int start, int num, tap_state_t *path)
 746 {
 747         int i;
 748
 749         for (i = start; i < (start + num); i++)
 750         {
 751                 if ((i & 7) == 0)
 752                 {
 753                         if (i > 0)
 754                         {
 755                                 vsllink_usb_out_buffer_idx++;
 756                         }
 757                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = 0;
 758                 }
 759
 760                 if (path[i - start] == tap_state_transition(tap_get_state(), true))
 761                 {
 762                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] |= 1 << (i & 7);
 763                 }
 764                 else if (path[i - start] == tap_state_transition(tap_get_state(), false))
 765                 {
 766                         // nothing to do
 767                 }
 768                 else
 769                 {
 770                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_name(tap_get_state()), tap_state_name(path[i]));
 771                         exit(-1);
 772                 }
 773                 tap_set_state(path[i - start]);
 774         }
 775         if ((i > 0) && ((i & 7) == 0))
 776         {
 777                 vsllink_usb_out_buffer_idx++;
 778                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = 0;
 779         }
 780
 781         tap_set_end_state(tap_get_state());
 782 }
 783
 784 static void vsllink_path_move_normal(int num_states, tap_state_t *path)
 785 {
 786         int i, tms_len, tms_cmd_pos, path_idx = 0;
 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_states tms bits in all
 792                 tms_len = vsllink_tms_data_len + num_states;
 793                 if (tms_len <= 16)
 794                 {
 795                         // merge into last tms shift
 796                         if (tms_len < 8)
 797                         {
 798                                 // just append tms data to the last tms byte
 799                                 vsllink_add_path(vsllink_tms_data_len, num_states, path);
 800                         }
 801                         else if (tms_len == 8)
 802                         {
 803                                 // end last tms shift command
 804                                 (*vsllink_tms_cmd_pos)--;
 805                                 vsllink_add_path(vsllink_tms_data_len, num_states, path);
 806                         }
 807                         else if (tms_len < 16)
 808                         {
 809                                 if ((*vsllink_tms_cmd_pos & VSLLINK_CMDJTAGSEQ_LENMSK) < VSLLINK_CMDJTAGSEQ_LENMSK)
 810                                 {
 811                                         // every tms shift command can contain VSLLINK_CMDJTAGSEQ_LENMSK + 1 bytes in most
 812                                         // there is enought tms length in the current tms shift command
 813                                         (*vsllink_tms_cmd_pos)++;
 814                                         vsllink_add_path(vsllink_tms_data_len, num_states, path);
 815                                 }
 816                                 else
 817                                 {
 818                                         // every tms shift command can contain VSLLINK_CMDJTAGSEQ_LENMSK + 1 bytes in most
 819                                         // not enough tms length in the current tms shift command
 820                                         // so a new command should be added
 821                                         // first decrease byte length of last tms shift command
 822                                         (*vsllink_tms_cmd_pos)--;
 823                                         // append tms data to the last tms byte
 824                                         vsllink_add_path(vsllink_tms_data_len, 8 - vsllink_tms_data_len, path);
 825                                         path += 8 - vsllink_tms_data_len;
 826                                         // add new command(3 bytes)
 827                                         vsllink_tap_ensure_space(0, 3);
 828                                         vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
 829                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | 1;
 830                                         vsllink_add_path(0, num_states - (8 - vsllink_tms_data_len), path);
 831                                 }
 832                         }
 833                         else if (tms_len == 16)
 834                         {
 835                                 // end last tms shift command
 836                                 vsllink_add_path(vsllink_tms_data_len, num_states, path);
 837                         }
 838
 839                         vsllink_tms_data_len = (vsllink_tms_data_len + num_states) & 7;
 840                         if (vsllink_tms_data_len == 0)
 841                         {
 842                                 vsllink_tms_cmd_pos = NULL;
 843                         }
 844                         num_states = 0;
 845                 }
 846                 else
 847                 {
 848                         vsllink_add_path(vsllink_tms_data_len, 16 - vsllink_tms_data_len, path);
 849
 850                         path += 16 - vsllink_tms_data_len;
 851                         num_states -= 16 - vsllink_tms_data_len;
 852                         vsllink_tms_data_len = 0;
 853                         vsllink_tms_cmd_pos = NULL;
 854                 }
 855         }
 856
 857         if (num_states > 0)
 858         {
 859                 // Normal operation, don't need to append tms data
 860                 vsllink_tms_data_len = num_states & 7;
 861
 862                 while (num_states > 0)
 863                 {
 864                         if (num_states > ((VSLLINK_CMDJTAGSEQ_LENMSK + 1) * 8))
 865                         {
 866                                 i = (VSLLINK_CMDJTAGSEQ_LENMSK + 1) * 8;
 867                         }
 868                         else
 869                         {
 870                                 i = num_states;
 871                         }
 872                         tms_len = (i + 7) >> 3;
 873                         vsllink_tap_ensure_space(0, tms_len + 2);
 874                         tms_cmd_pos = vsllink_usb_out_buffer_idx;
 875                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | (tms_len - 1);
 876
 877                         vsllink_add_path(0, i, path + path_idx);
 878
 879                         path_idx += i;
 880                         num_states -= i;
 881                 }
 882
 883                 if (vsllink_tms_data_len > 0)
 884                 {
 885                         if (tms_len < (VSLLINK_CMDJTAGSEQ_LENMSK + 1))
 886                         {
 887                                 vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[tms_cmd_pos];
 888                                 (*vsllink_tms_cmd_pos)++;
 889                         }
 890                         else
 891                         {
 892                                 vsllink_usb_out_buffer[tms_cmd_pos]--;
 893
 894                                 tms_len = vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
 895                                 vsllink_tap_ensure_space(0, 3);
 896                                 vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
 897                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | 1;
 898                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = tms_len;
 899                         }
 900                 }
 901         }
 902 }
 903 static void vsllink_path_move_dma(int num_states, tap_state_t *path)
 904 {
 905         int i, j = 0;
 906
 907         if (tap_length & 7)
 908         {
 909                 if ((8 - (tap_length & 7)) < num_states)
 910                 {
 911                         j = 8 - (tap_length & 7);
 912                 }
 913                 else
 914                 {
 915                         j = num_states;
 916                 }
 917                 for (i = 0; i < j; i++)
 918                 {
 919                         if (path[i] == tap_state_transition(tap_get_state(), false))
 920                         {
 921                                 vsllink_tap_append_step(0, 0);
 922                         }
 923                         else if (path[i] == tap_state_transition(tap_get_state(), true))
 924                         {
 925                                 vsllink_tap_append_step(1, 0);
 926                         }
 927                         else
 928                         {
 929                                 LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_name(tap_get_state()), tap_state_name(path[i]));
 930                                 exit(-1);
 931                         }
 932                         tap_set_state(path[i]);
 933                 }
 934                 num_states -= j;
 935         }
 936
 937         if (num_states > 0)
 938         {
 939                 vsllink_tap_ensure_space(0, num_states);
 940
 941                 for (i = 0; i < num_states; i++)
 942                 {
 943                         if (path[j + i] == tap_state_transition(tap_get_state(), false))
 944                         {
 945                                 vsllink_tap_append_step(0, 0);
 946                         }
 947                         else if (path[j + i] == tap_state_transition(tap_get_state(), true))
 948                         {
 949                                 vsllink_tap_append_step(1, 0);
 950                         }
 951                         else
 952                         {
 953                                 LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_name(tap_get_state()), tap_state_name(path[i]));
 954                                 exit(-1);
 955                         }
 956                         tap_set_state(path[j + i]);
 957                 }
 958         }
 959
 960         tap_set_end_state(tap_get_state());
 961 }
 962
 963 static void vsllink_stableclocks_normal(int num_cycles, int tms)
 964 {
 965         int tms_len;
 966         u16 tms_append_byte;
 967
 968         if (vsllink_tms_data_len > 0)
 969         {
 970                 // there are vsllink_tms_data_len more tms bits to be shifted
 971                 // so there are vsllink_tms_data_len + num_cycles tms bits in all
 972                 tms_len = vsllink_tms_data_len + num_cycles;
 973                 if (tms > 0)
 974                 {
 975                         // append '1' for tms
 976                         tms_append_byte = (u16)((((1 << num_cycles) - 1) << vsllink_tms_data_len) & 0xFFFF);
 977                 }
 978                 else
 979                 {
 980                         // append '0' for tms
 981                         tms_append_byte = 0;
 982                 }
 983                 if (tms_len <= 16)
 984                 {
 985                         // merge into last tms shift
 986                         if (tms_len < 8)
 987                         {
 988                                 // just add to vsllink_tms_data_len
 989                                 // same result if tun through
 990                                 //vsllink_tms_data_len += num_cycles;
 991                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] |= (u8)(tms_append_byte & 0xFF);
 992                         }
 993                         else if (tms_len == 8)
 994                         {
 995                                 // end last tms shift command
 996                                 // just reduce it, and append last tms byte
 997                                 (*vsllink_tms_cmd_pos)--;
 998                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (u8)(tms_append_byte & 0xFF);
 999                         }
1000                         else if (tms_len < 16)
1001                         {
1002                                 if ((*vsllink_tms_cmd_pos & VSLLINK_CMDJTAGSEQ_LENMSK) < VSLLINK_CMDJTAGSEQ_LENMSK)
1003                                 {
1004                                         // every tms shift command can contain VSLLINK_CMDJTAGSEQ_LENMSK + 1 bytes in most
1005                                         // there is enought tms length in the current tms shift command
1006                                         // increase the tms byte length by 1 and set the last byte to 0
1007                                         (*vsllink_tms_cmd_pos)++;
1008                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (u8)(tms_append_byte & 0xFF);
1009                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = (u8)(tms_append_byte >> 8);
1010                                 }
1011                                 else
1012                                 {
1013                                         // every tms shift command can contain VSLLINK_CMDJTAGSEQ_LENMSK + 1 bytes in most
1014                                         // not enough tms length in the current tms shift command
1015                                         // so a new command should be added
1016                                         // first decrease byte length of last tms shift command
1017                                         (*vsllink_tms_cmd_pos)--;
1018                                         // append last tms byte and move the command pointer to the next empty position
1019                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (u8)(tms_append_byte & 0xFF);
1020                                         // add new command(3 bytes)
1021                                         vsllink_tap_ensure_space(0, 3);
1022                                         vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
1023                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | 1;
1024                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = (u8)(tms_append_byte >> 8);
1025                                 }
1026                         }
1027                         else if (tms_len == 16)
1028                         {
1029                                 // end last tms shift command
1030                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (u8)(tms_append_byte & 0xFF);
1031                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (u8)(tms_append_byte >> 8);
1032                         }
1033
1034                         vsllink_tms_data_len = tms_len & 7;
1035                         if (vsllink_tms_data_len == 0)
1036                         {
1037                                 vsllink_tms_cmd_pos = NULL;
1038                         }
1039                         num_cycles = 0;
1040                 }
1041                 else
1042                 {
1043                         // more shifts will be needed
1044                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (u8)(tms_append_byte & 0xFF);
1045                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (u8)(tms_append_byte >> 8);
1046
1047                         num_cycles -= 16 - vsllink_tms_data_len;
1048                         vsllink_tms_data_len = 0;
1049                         vsllink_tms_cmd_pos = NULL;
1050                 }
1051         }
1052         // from here vsllink_tms_data_len == 0 or num_cycles == 0
1053
1054         if (vsllink_tms_data_len > 0)
1055         {
1056                 // num_cycles == 0
1057                 // no need to shift
1058                 if (num_cycles > 0)
1059                 {
1060                         LOG_ERROR("There MUST be some bugs in the driver");
1061                         exit(-1);
1062                 }
1063         }
1064         else
1065         {
1066                 // get number of bytes left to be sent
1067                 tms_len = num_cycles >> 3;
1068                 if (tms_len > 0)
1069                 {
1070                         vsllink_tap_ensure_space(1, 5);
1071                         // if tms_len > 0, vsllink_tms_data_len == 0
1072                         // so just add new command
1073                         // LSB of the command byte is the tms value when do the shifting
1074                         if (tms > 0)
1075                         {
1076                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSCLOCK | 1;
1077                         }
1078                         else
1079                         {
1080                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSCLOCK;
1081                         }
1082                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms_len >> 0) & 0xff;
1083                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms_len >> 8) & 0xff;
1084                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms_len >> 16) & 0xff;
1085                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms_len >> 24) & 0xff;
1086
1087                         vsllink_usb_in_want_length += 1;
1088                         pending_scan_results_buffer[pending_scan_results_length].buffer = NULL;
1089                         pending_scan_results_length++;
1090
1091                         if (tms_len > 0xFFFF)
1092                         {
1093                                 vsllink_tap_execute();
1094                         }
1095                 }
1096
1097                 // post-process
1098                 vsllink_tms_data_len = num_cycles & 7;
1099                 if (vsllink_tms_data_len > 0)
1100                 {
1101                         vsllink_tap_ensure_space(0, 3);
1102                         vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
1103                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | 1;
1104                         if (tms > 0)
1105                         {
1106                                 // append '1' for tms
1107                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = (1 << vsllink_tms_data_len) - 1;
1108                         }
1109                         else
1110                         {
1111                                 // append '0' for tms
1112                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = 0x00;
1113                         }
1114                 }
1115         }
1116 }
1117 static void vsllink_stableclocks_dma(int num_cycles, int tms)
1118 {
1119         int i, cur_cycles;
1120
1121         if (tap_length & 7)
1122         {
1123                 if ((8 - (tap_length & 7)) < num_cycles)
1124                 {
1125                         cur_cycles = 8 - (tap_length & 7);
1126                 }
1127                 else
1128                 {
1129                         cur_cycles = num_cycles;
1130                 }
1131                 for (i = 0; i < cur_cycles; i++)
1132                 {
1133                         vsllink_tap_append_step(tms, 0);
1134                 }
1135                 num_cycles -= cur_cycles;
1136         }
1137
1138         while (num_cycles > 0)
1139         {
1140                 if (num_cycles > 8 * tap_buffer_size)
1141                 {
1142                         cur_cycles = 8 * tap_buffer_size;
1143                 }
1144                 else
1145                 {
1146                         cur_cycles = num_cycles;
1147                 }
1148
1149                 vsllink_tap_ensure_space(0, cur_cycles);
1150
1151                 for (i = 0; i < cur_cycles; i++)
1152                 {
1153                         vsllink_tap_append_step(tms, 0);
1154                 }
1155
1156                 num_cycles -= cur_cycles;
1157         }
1158 }
1159
1160 static void vsllink_runtest(int num_cycles)
1161 {
1162         tap_state_t saved_end_state = tap_get_end_state();
1163
1164         if (tap_get_state() != TAP_IDLE)
1165         {
1166                 // enter into IDLE state
1167                 vsllink_end_state(TAP_IDLE);
1168                 vsllink_state_move();
1169         }
1170
1171         vsllink_stableclocks(num_cycles, 0);
1172
1173         // post-process
1174         // set end_state
1175         vsllink_end_state(saved_end_state);
1176         tap_set_state(TAP_IDLE);
1177         if (tap_get_end_state() != TAP_IDLE)
1178         {
1179                 vsllink_state_move();
1180         }
1181 }
1182
1183 static void vsllink_scan_normal(bool ir_scan, enum scan_type type, u8 *buffer, int scan_size, scan_command_t *command)
1184 {
1185         tap_state_t saved_end_state;
1186         u8 bits_left, tms_tmp, tdi_len;
1187         int i;
1188
1189         if (0 == scan_size )
1190         {
1191                 return;
1192         }
1193
1194         tdi_len = ((scan_size + 7) >> 3);
1195         if ((tdi_len + 7) > VSLLINK_BufferSize)
1196         {
1197                 LOG_ERROR("Your implementation of VSLLink has not enough buffer");
1198                 exit(-1);
1199         }
1200
1201         saved_end_state = tap_get_end_state();
1202
1203         /* Move to appropriate scan state */
1204         vsllink_end_state(ir_scan ? TAP_IRSHIFT : TAP_DRSHIFT);
1205
1206         if (vsllink_tms_data_len > 0)
1207         {
1208                 if (tap_get_state() == tap_get_end_state())
1209                 {
1210                         // already in IRSHIFT or DRSHIFT state
1211                         // merge tms data in the last tms shift command into next scan command
1212                         if(*vsllink_tms_cmd_pos < 1)
1213                         {
1214                                 LOG_ERROR("There MUST be some bugs in the driver");
1215                                 exit(-1);
1216                         }
1217                         else if(*vsllink_tms_cmd_pos < 2)
1218                         {
1219                                 tms_tmp = vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
1220                                 vsllink_usb_out_buffer_idx--;
1221                         }
1222                         else
1223                         {
1224                                 tms_tmp = vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
1225                                 *vsllink_tms_cmd_pos -= 2;
1226                         }
1227
1228                         vsllink_tap_ensure_space(1, tdi_len + 7);
1229                         // VSLLINK_CMDJTAGSEQ_SCAN ored by 1 means that tms_before is valid
1230                         // which is merged from the last tms shift command
1231                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_SCAN | 1;
1232                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = ((tdi_len + 1) >> 0) & 0xff;
1233                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = ((tdi_len + 1) >> 8) & 0xff;
1234                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = tms_tmp;
1235                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = buffer[0] << (8 - vsllink_tms_data_len);
1236
1237                         for (i = 0; i < tdi_len; i++)
1238                         {
1239                                 buffer[i] >>= 8 - vsllink_tms_data_len;
1240                                 if (i != tdi_len)
1241                                 {
1242                                         buffer[i] += buffer[i + 1] << vsllink_tms_data_len;
1243                                 }
1244                         }
1245
1246                         vsllink_tap_append_scan_normal(scan_size - vsllink_tms_data_len, buffer, command, vsllink_tms_data_len);
1247                         scan_size -= 8 - vsllink_tms_data_len;
1248                         vsllink_tms_data_len = 0;
1249                 }
1250                 else
1251                 {
1252                         vsllink_state_move();
1253                         vsllink_tap_ensure_space(1, tdi_len + 5);
1254
1255                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_SCAN;
1256                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tdi_len >> 0) & 0xff;
1257                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tdi_len >> 8) & 0xff;
1258
1259                         vsllink_tap_append_scan_normal(scan_size, buffer, command, 0);
1260                 }
1261         }
1262         else
1263         {
1264                 vsllink_tap_ensure_space(1, tdi_len + 7);
1265
1266                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_SCAN | 1;
1267                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = ((tdi_len + 1) >> 0) & 0xff;
1268                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = ((tdi_len + 1)>> 8) & 0xff;
1269                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
1270                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 0;
1271
1272                 vsllink_tap_append_scan_normal(scan_size, buffer, command, 8);
1273         }
1274         vsllink_end_state(saved_end_state);
1275
1276         bits_left = scan_size & 0x07;
1277         tap_set_state(ir_scan ? TAP_IRPAUSE : TAP_DRPAUSE);
1278
1279         if (bits_left > 0)
1280         {
1281                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 1 << (bits_left - 1);
1282         }
1283         else
1284         {
1285                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 1 << 7;
1286         }
1287
1288         if (tap_get_state() != tap_get_end_state())
1289         {
1290                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
1291         }
1292         else
1293         {
1294                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 0;
1295         }
1296
1297         tap_set_state(tap_get_end_state());
1298 }
1299 static void vsllink_scan_dma(bool ir_scan, enum scan_type type, u8 *buffer, int scan_size, scan_command_t *command)
1300 {
1301         tap_state_t saved_end_state;
1302
1303         saved_end_state = tap_get_end_state();
1304
1305         /* Move to appropriate scan state */
1306         vsllink_end_state(ir_scan ? TAP_IRSHIFT : TAP_DRSHIFT);
1307
1308         vsllink_state_move();
1309         vsllink_end_state(saved_end_state);
1310
1311         /* Scan */
1312         vsllink_tap_append_scan_dma(scan_size, buffer, command);
1313
1314         tap_set_state(ir_scan ? TAP_IRPAUSE : TAP_DRPAUSE);
1315         while (tap_length % 8 != 0)
1316         {
1317                 // more 0s in Pause
1318                 vsllink_tap_append_step(0, 0);
1319         }
1320
1321         if (tap_get_state() != tap_get_end_state())
1322         {
1323                 vsllink_state_move();
1324         }
1325 }
1326
1327 static void vsllink_reset(int trst, int srst)
1328 {
1329         int result;
1330
1331         LOG_DEBUG("trst: %i, srst: %i", trst, srst);
1332
1333         /* Signals are active low */
1334         vsllink_usb_out_buffer[0] = VSLLINK_CMD_SET_PORT;
1335         vsllink_usb_out_buffer[1] = JTAG_PINMSK_SRST | JTAG_PINMSK_TRST;
1336         vsllink_usb_out_buffer[2] = 0;
1337         if (srst == 0)
1338         {
1339                 vsllink_usb_out_buffer[2] |= JTAG_PINMSK_SRST;
1340         }
1341         if (trst == 0)
1342         {
1343                 vsllink_usb_out_buffer[2] |= JTAG_PINMSK_TRST;
1344         }
1345
1346         result = vsllink_usb_write(vsllink_jtag_handle, 3);
1347         if (result != 3)
1348         {
1349                 LOG_ERROR("VSLLink command VSLLINK_CMD_SET_PORT failed (%d)", result);
1350         }
1351 }
1352
1353 static void vsllink_simple_command(u8 command)
1354 {
1355         int result;
1356
1357         DEBUG_JTAG_IO("0x%02x", command);
1358
1359         vsllink_usb_out_buffer[0] = command;
1360         result = vsllink_usb_write(vsllink_jtag_handle, 1);
1361
1362         if (result != 1)
1363         {
1364                 LOG_ERROR("VSLLink command 0x%02x failed (%d)", command, result);
1365         }
1366 }
1367
1368 static int vsllink_register_commands(struct command_context_s *cmd_ctx)
1369 {
1370         register_command(cmd_ctx, NULL, "vsllink_usb_vid", vsllink_handle_usb_vid_command,
1371                                         COMMAND_CONFIG, NULL);
1372         register_command(cmd_ctx, NULL, "vsllink_usb_pid", vsllink_handle_usb_pid_command,
1373                                         COMMAND_CONFIG, NULL);
1374         register_command(cmd_ctx, NULL, "vsllink_usb_bulkin", vsllink_handle_usb_bulkin_command,
1375                                         COMMAND_CONFIG, NULL);
1376         register_command(cmd_ctx, NULL, "vsllink_usb_bulkout", vsllink_handle_usb_bulkout_command,
1377                                         COMMAND_CONFIG, NULL);
1378         register_command(cmd_ctx, NULL, "vsllink_usb_interface", vsllink_handle_usb_interface_command,
1379                                         COMMAND_CONFIG, NULL);
1380         register_command(cmd_ctx, NULL, "vsllink_mode", vsllink_handle_mode_command,
1381                                         COMMAND_CONFIG, NULL);
1382
1383         return ERROR_OK;
1384 }
1385
1386 static int vsllink_handle_mode_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1387 {
1388         if (argc != 1) {
1389                 LOG_ERROR("parameter error, should be one parameter for VID");
1390                 return ERROR_FAIL;
1391         }
1392
1393         if (!strcmp(args[0], "normal"))
1394         {
1395                 vsllink_mode = VSLLINK_MODE_NORMAL;
1396         }
1397         else if (!strcmp(args[0], "dma"))
1398         {
1399                 vsllink_mode = VSLLINK_MODE_DMA;
1400         }
1401         else
1402         {
1403                 LOG_ERROR("invalid vsllink_mode: %s", args[0]);
1404                 return ERROR_FAIL;
1405         }
1406
1407         return ERROR_OK;
1408 }
1409
1410 static int vsllink_handle_usb_vid_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1411 {
1412         if (argc != 1)
1413         {
1414                 LOG_ERROR("parameter error, should be one parameter for VID");
1415                 return ERROR_OK;
1416         }
1417
1418         vsllink_usb_vid = strtol(args[0], NULL, 0);
1419
1420         return ERROR_OK;
1421 }
1422
1423 static int vsllink_handle_usb_pid_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 PID");
1428                 return ERROR_OK;
1429         }
1430
1431         vsllink_usb_pid = strtol(args[0], NULL, 0);
1432
1433         return ERROR_OK;
1434 }
1435
1436 static int vsllink_handle_usb_bulkin_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1437 {
1438         if (argc != 1)
1439         {
1440                 LOG_ERROR("parameter error, should be one parameter for BULKIN endpoint");
1441                 return ERROR_OK;
1442         }
1443
1444         vsllink_usb_bulkin = strtol(args[0], NULL, 0) | 0x80;
1445
1446         return ERROR_OK;
1447 }
1448
1449 static int vsllink_handle_usb_bulkout_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1450 {
1451         if (argc != 1)
1452         {
1453                 LOG_ERROR("parameter error, should be one parameter for BULKOUT endpoint");
1454                 return ERROR_OK;
1455         }
1456
1457         vsllink_usb_bulkout = strtol(args[0], NULL, 0);
1458
1459         return ERROR_OK;
1460 }
1461
1462 static int vsllink_handle_usb_interface_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1463 {
1464         if (argc != 1)
1465         {
1466                 LOG_ERROR("parameter error, should be one parameter for interface number");
1467                 return ERROR_OK;
1468         }
1469
1470         vsllink_usb_interface = strtol(args[0], NULL, 0);
1471
1472         return ERROR_OK;
1473 }
1474
1475 /***************************************************************************/
1476 /* VSLLink tap functions */
1477
1478 static void vsllink_tap_init_normal(void)
1479 {
1480         vsllink_usb_out_buffer_idx = 0;
1481         vsllink_usb_in_want_length = 0;
1482         pending_scan_results_length = 0;
1483 }
1484 static void vsllink_tap_init_dma(void)
1485 {
1486         tap_length = 0;
1487         pending_scan_results_length = 0;
1488 }
1489
1490 static void vsllink_tap_ensure_space_normal(int scans, int length)
1491 {
1492         int available_scans = MAX_PENDING_SCAN_RESULTS - pending_scan_results_length;
1493         int available_bytes = VSLLINK_BufferSize - vsllink_usb_out_buffer_idx;
1494
1495         if (scans > available_scans || length > available_bytes)
1496         {
1497                 vsllink_tap_execute();
1498         }
1499 }
1500 static void vsllink_tap_ensure_space_dma(int scans, int length)
1501 {
1502         int available_scans = MAX_PENDING_SCAN_RESULTS - pending_scan_results_length;
1503         int available_bytes = tap_buffer_size * 8 - tap_length;
1504
1505         if (scans > available_scans || length > available_bytes)
1506         {
1507                 vsllink_tap_execute();
1508         }
1509 }
1510
1511 static void vsllink_tap_append_step(int tms, int tdi)
1512 {
1513         last_tms = tms;
1514         int index = tap_length / 8;
1515
1516         if (index < tap_buffer_size)
1517         {
1518                 int bit_index = tap_length % 8;
1519                 u8 bit = 1 << bit_index;
1520
1521                 if (tms)
1522                 {
1523                         tms_buffer[index] |= bit;
1524                 }
1525                 else
1526                 {
1527                         tms_buffer[index] &= ~bit;
1528                 }
1529
1530                 if (tdi)
1531                 {
1532                         tdi_buffer[index] |= bit;
1533                 }
1534                 else
1535                 {
1536                         tdi_buffer[index] &= ~bit;
1537                 }
1538
1539                 tap_length++;
1540         }
1541         else
1542         {
1543                 LOG_ERROR("buffer overflow, tap_length=%d", tap_length);
1544         }
1545 }
1546
1547 static void vsllink_tap_append_scan_normal(int length, u8 *buffer, scan_command_t *command, int offset)
1548 {
1549         pending_scan_result_t *pending_scan_result = &pending_scan_results_buffer[pending_scan_results_length];
1550         int i;
1551
1552         if (offset > 0)
1553         {
1554                 vsllink_usb_in_want_length += ((length + 7) >> 3) + 1;
1555         }
1556         else
1557         {
1558                 vsllink_usb_in_want_length += (length + 7) >> 3;
1559         }
1560         pending_scan_result->length = length;
1561         pending_scan_result->offset = offset;
1562         pending_scan_result->command = command;
1563         pending_scan_result->buffer = buffer;
1564
1565         for (i = 0; i < ((length + 7) >> 3); i++)
1566         {
1567                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = buffer[i];
1568         }
1569
1570         pending_scan_results_length++;
1571 }
1572 static void vsllink_tap_append_scan_dma(int length, u8 *buffer, scan_command_t *command)
1573 {
1574         pending_scan_result_t *pending_scan_result;
1575         int len_tmp, len_all, i;
1576
1577         len_all = 0;
1578         while (len_all < length)
1579         {
1580                 if ((length - len_all) > tap_buffer_size * 8)
1581                 {
1582                         len_tmp = tap_buffer_size * 8;
1583                 }
1584                 else
1585                 {
1586                         len_tmp = length - len_all;
1587                 }
1588
1589                 vsllink_tap_ensure_space(1, (len_tmp + 7) & ~7);
1590
1591                 pending_scan_result = &pending_scan_results_buffer[pending_scan_results_length];
1592                 pending_scan_result->offset = tap_length;
1593                 pending_scan_result->length = len_tmp;
1594                 pending_scan_result->command = command;
1595                 pending_scan_result->buffer = buffer + len_all / 8;
1596
1597                 for (i = 0; i < len_tmp; i++)
1598                 {
1599                         vsllink_tap_append_step(((len_all+i) < length-1 ? 0 : 1), (buffer[(len_all+i)/8] >> ((len_all+i)%8)) & 1);
1600                 }
1601
1602                 pending_scan_results_length++;
1603                 len_all += len_tmp;
1604         }
1605 }
1606
1607 /* Pad and send a tap sequence to the device, and receive the answer.
1608  * For the purpose of padding we assume that we are in reset or idle or pause state. */
1609 static int vsllink_tap_execute_normal(void)
1610 {
1611         int i;
1612         int result;
1613         int first = 0;
1614
1615         if (vsllink_tms_data_len > 0)
1616         {
1617                 if((tap_get_state() != TAP_RESET) && (tap_get_state() != TAP_IDLE) && (tap_get_state() != TAP_IRPAUSE) && (tap_get_state() != TAP_DRPAUSE))
1618                 {
1619                         LOG_WARNING("%s is not in RESET or IDLE or PAUSR state", tap_state_name(tap_get_state()));
1620                 }
1621
1622                 if (vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] & (1 << (vsllink_tms_data_len - 1)))
1623                 {
1624                         // last tms bit is '1'
1625                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= 0xFF << vsllink_tms_data_len;
1626                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 0xFF;
1627                         vsllink_tms_data_len = 0;
1628                 }
1629                 else
1630                 {
1631                         // last tms bit is '0'
1632                         vsllink_usb_out_buffer_idx++;
1633                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 0;
1634                         vsllink_tms_data_len = 0;
1635                 }
1636         }
1637
1638         if (vsllink_usb_out_buffer_idx > 3)
1639         {
1640                 if (vsllink_usb_out_buffer[0] == VSLLINK_CMD_HW_JTAGSEQCMD)
1641                 {
1642                         vsllink_usb_out_buffer[1] = (vsllink_usb_out_buffer_idx >> 0) & 0xff;
1643                         vsllink_usb_out_buffer[2] = (vsllink_usb_out_buffer_idx >> 8) & 0xff;
1644                 }
1645
1646                 result = vsllink_usb_message(vsllink_jtag_handle, vsllink_usb_out_buffer_idx, vsllink_usb_in_want_length);
1647
1648                 if (result == vsllink_usb_in_want_length)
1649                 {
1650                         for (i = 0; i < pending_scan_results_length; i++)
1651                         {
1652                                 pending_scan_result_t *pending_scan_result = &pending_scan_results_buffer[i];
1653                                 u8 *buffer = pending_scan_result->buffer;
1654                                 int length = pending_scan_result->length;
1655                                 int offset = pending_scan_result->offset;
1656                                 scan_command_t *command = pending_scan_result->command;
1657
1658                                 if (buffer != NULL)
1659                                 {
1660                                         // IRSHIFT or DRSHIFT
1661                                         buf_set_buf(vsllink_usb_in_buffer, first * 8 + offset, buffer, 0, length);
1662                                         first += (length + offset + 7) >> 3;
1663
1664                                         DEBUG_JTAG_IO("JTAG scan read(%d bits):", length);
1665 #ifdef _DEBUG_JTAG_IO_
1666                                         vsllink_debug_buffer(buffer, (length + 7) >> 3);
1667 #endif
1668
1669                                         if (jtag_read_buffer(buffer, command) != ERROR_OK)
1670                                         {
1671                                                 vsllink_tap_init();
1672                                                 return ERROR_JTAG_QUEUE_FAILED;
1673                                         }
1674
1675                                         free(pending_scan_result->buffer);
1676                                         pending_scan_result->buffer = NULL;
1677                                 }
1678                                 else
1679                                 {
1680                                         first++;
1681                                 }
1682                         }
1683                 }
1684                 else
1685                 {
1686                         LOG_ERROR("vsllink_tap_execute, wrong result %d, expected %d", result, vsllink_usb_in_want_length);
1687                         return ERROR_JTAG_QUEUE_FAILED;
1688                 }
1689
1690                 vsllink_tap_init();
1691         }
1692         reset_command_pointer();
1693
1694         return ERROR_OK;
1695 }
1696 static int vsllink_tap_execute_dma(void)
1697 {
1698         int byte_length;
1699         int i;
1700         int result;
1701
1702         if (tap_length > 0)
1703         {
1704                 /* Pad last byte so that tap_length is divisible by 8 */
1705                 while (tap_length % 8 != 0)
1706                 {
1707                         /* More of the last TMS value keeps us in the same state,
1708                          * analogous to free-running JTAG interfaces. */
1709                         vsllink_tap_append_step(last_tms, 0);
1710                 }
1711                 byte_length = tap_length / 8;
1712
1713                 vsllink_usb_out_buffer[0] = VSLLINK_CMD_HW_JTAGRAWCMD;
1714                 vsllink_usb_out_buffer[1] = ((byte_length * 2 + 3) >> 0) & 0xff;                // package size
1715                 vsllink_usb_out_buffer[2] = ((byte_length * 2 + 3) >> 8) & 0xff;
1716
1717                 memcpy(&vsllink_usb_out_buffer[3], tdi_buffer, byte_length);
1718                 memcpy(&vsllink_usb_out_buffer[3 + byte_length], tms_buffer, byte_length);
1719
1720                 result = vsllink_usb_message(vsllink_jtag_handle, 3 + 2 * byte_length, byte_length);
1721                 if (result == byte_length)
1722                 {
1723                         for (i = 0; i < pending_scan_results_length; i++)
1724                         {
1725                                 pending_scan_result_t *pending_scan_result = &pending_scan_results_buffer[i];
1726                                 u8 *buffer = pending_scan_result->buffer;
1727                                 int length = pending_scan_result->length;
1728                                 int first = pending_scan_result->offset;
1729
1730                                 scan_command_t *command = pending_scan_result->command;
1731                                 buf_set_buf(vsllink_usb_in_buffer, first, buffer, 0, length);
1732
1733                                 DEBUG_JTAG_IO("JTAG scan read(%d bits, from %d bits):", length, first);
1734 #ifdef _DEBUG_JTAG_IO_
1735                                 vsllink_debug_buffer(buffer, (length + 7) >> 3);
1736 #endif
1737
1738                                 if (jtag_read_buffer(buffer, command) != ERROR_OK)
1739                                 {
1740                                         vsllink_tap_init();
1741                                         return ERROR_JTAG_QUEUE_FAILED;
1742                                 }
1743
1744                                 if (pending_scan_result->buffer != NULL)
1745                                 {
1746                                         free(pending_scan_result->buffer);
1747                                 }
1748                         }
1749                 }
1750                 else
1751                 {
1752                         LOG_ERROR("vsllink_tap_execute, wrong result %d, expected %d", result, byte_length);
1753                         return ERROR_JTAG_QUEUE_FAILED;
1754                 }
1755
1756                 vsllink_tap_init();
1757         }
1758
1759         return ERROR_OK;
1760 }
1761
1762 /*****************************************************************************/
1763 /* VSLLink USB low-level functions */
1764
1765 static vsllink_jtag_t* vsllink_usb_open(void)
1766 {
1767         struct usb_bus *busses;
1768         struct usb_bus *bus;
1769         struct usb_device *dev;
1770         int ret;
1771
1772         vsllink_jtag_t *result;
1773
1774         result = (vsllink_jtag_t*) malloc(sizeof(vsllink_jtag_t));
1775
1776         usb_init();
1777         usb_find_busses();
1778         usb_find_devices();
1779
1780         busses = usb_get_busses();
1781
1782         /* find vsllink_jtag device in usb bus */
1783
1784         for (bus = busses; bus; bus = bus->next)
1785         {
1786                 for (dev = bus->devices; dev; dev = dev->next)
1787                 {
1788                         if ((dev->descriptor.idVendor == vsllink_usb_vid) && (dev->descriptor.idProduct == vsllink_usb_pid))
1789                         {
1790                                 result->usb_handle = usb_open(dev);
1791                                 if (NULL == result->usb_handle)
1792                                 {
1793                                         LOG_ERROR("failed to open %04X:%04X, not enough permissions?", vsllink_usb_vid, vsllink_usb_pid);
1794                                         exit(-1);
1795                                 }
1796
1797                                 /* usb_set_configuration required under win32 */
1798                                 ret = usb_set_configuration(result->usb_handle, dev->config[0].bConfigurationValue);
1799                                 if (ret != 0)
1800                                 {
1801                                         LOG_ERROR("fail to set configuration to %d, %d returned, not enough permissions?", dev->config[0].bConfigurationValue, ret);
1802                                         exit(-1);
1803                                 }
1804                                 ret = usb_claim_interface(result->usb_handle, vsllink_usb_interface);
1805                                 if (ret != 0)
1806                                 {
1807                                         LOG_ERROR("fail to claim interface %d, %d returned", vsllink_usb_interface, ret);
1808                                         exit(-1);
1809                                 }
1810
1811 #if 0
1812                                 /*
1813                                  * This makes problems under Mac OS X. And is not needed
1814                                  * under Windows. Hopefully this will not break a linux build
1815                                  */
1816                                 usb_set_altinterface(result->usb_handle, 0);
1817 #endif
1818                                 return result;
1819                         }
1820                 }
1821         }
1822
1823         free(result);
1824         return NULL;
1825 }
1826
1827 static void vsllink_usb_close(vsllink_jtag_t *vsllink_jtag)
1828 {
1829         int ret;
1830
1831         ret = usb_release_interface(vsllink_jtag->usb_handle, vsllink_usb_interface);
1832         if (ret != 0)
1833         {
1834                 LOG_ERROR("fail to release interface %d, %d returned", vsllink_usb_interface, ret);
1835                 exit(-1);
1836         }
1837
1838         ret = usb_close(vsllink_jtag->usb_handle);
1839         if (ret != 0)
1840         {
1841                 LOG_ERROR("fail to close usb, %d returned", ret);
1842                 exit(-1);
1843         }
1844
1845         free(vsllink_jtag);
1846 }
1847
1848 /* Send a message and receive the reply. */
1849 static int vsllink_usb_message(vsllink_jtag_t *vsllink_jtag, int out_length, int in_length)
1850 {
1851         int result;
1852
1853         result = vsllink_usb_write(vsllink_jtag, out_length);
1854         if (result == out_length)
1855         {
1856                 if (in_length > 0)
1857                 {
1858                         result = vsllink_usb_read(vsllink_jtag);
1859                         if (result == in_length )
1860                         {
1861                                 return result;
1862                         }
1863                         else
1864                         {
1865                                 LOG_ERROR("usb_bulk_read failed (requested=%d, result=%d)", in_length, result);
1866                                 return -1;
1867                         }
1868                 }
1869                 return 0;
1870         }
1871         else
1872         {
1873                 LOG_ERROR("usb_bulk_write failed (requested=%d, result=%d)", out_length, result);
1874                 return -1;
1875         }
1876 }
1877
1878 /* Write data from out_buffer to USB. */
1879 static int vsllink_usb_write(vsllink_jtag_t *vsllink_jtag, int out_length)
1880 {
1881         int result;
1882
1883         if (out_length > VSLLINK_BufferSize)
1884         {
1885                 LOG_ERROR("vsllink_jtag_write illegal out_length=%d (max=%d)", out_length, VSLLINK_BufferSize);
1886                 return -1;
1887         }
1888
1889         result = usb_bulk_write(vsllink_jtag->usb_handle, vsllink_usb_bulkout, \
1890                 (char *)vsllink_usb_out_buffer, out_length, VSLLINK_USB_TIMEOUT);
1891
1892         DEBUG_JTAG_IO("vsllink_usb_write, out_length = %d, result = %d", out_length, result);
1893
1894 #ifdef _DEBUG_USB_COMMS_
1895         LOG_DEBUG("USB out:");
1896         vsllink_debug_buffer(vsllink_usb_out_buffer, out_length);
1897 #endif
1898
1899 #ifdef _VSLLINK_IN_DEBUG_MODE_
1900         usleep(100000);
1901 #endif
1902
1903         return result;
1904 }
1905
1906 /* Read data from USB into in_buffer. */
1907 static int vsllink_usb_read(vsllink_jtag_t *vsllink_jtag)
1908 {
1909         int result = usb_bulk_read(vsllink_jtag->usb_handle, vsllink_usb_bulkin, \
1910                 (char *)vsllink_usb_in_buffer, VSLLINK_BufferSize, VSLLINK_USB_TIMEOUT);
1911
1912         DEBUG_JTAG_IO("vsllink_usb_read, result = %d", result);
1913
1914 #ifdef _DEBUG_USB_COMMS_
1915         LOG_DEBUG("USB in:");
1916         vsllink_debug_buffer(vsllink_usb_in_buffer, result);
1917 #endif
1918         return result;
1919 }
1920
1921 #define BYTES_PER_LINE  16
1922
1923 #if defined _DEBUG_USB_COMMS_ || defined _DEBUG_JTAG_IO_
1924 static void vsllink_debug_buffer(u8 *buffer, int length)
1925 {
1926         char line[81];
1927         char s[4];
1928         int i;
1929         int j;
1930
1931         for (i = 0; i < length; i += BYTES_PER_LINE)
1932         {
1933                 snprintf(line, 5, "%04x", i);
1934                 for (j = i; j < i + BYTES_PER_LINE && j < length; j++)
1935                 {
1936                         snprintf(s, 4, " %02x", buffer[j]);
1937                         strcat(line, s);
1938                 }
1939                 LOG_DEBUG("%s", line);
1940         }
1941 }
1942 #endif // _DEBUG_USB_COMMS_ || _DEBUG_JTAG_IO_