src/jtag/bitq.c

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by Pavel Chromy                                    *
   3  *   chromy@asix.cz                                                        *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include "bitq.h"
  25
  26 /* project specific includes */
  27 #include "log.h"
  28 #include "types.h"
  29 #include "jtag.h"
  30 #include "configuration.h"
  31
  32 /* system includes */
  33 #include <string.h>
  34 #include <stdlib.h>
  35 #include <unistd.h>
  36
  37 #include <sys/time.h>
  38 #include <time.h>
  39
  40
  41 bitq_interface_t *bitq_interface; /* low level bit queue interface */
  42
  43 bitq_state_t bitq_in_state; /* state of input queue */
  44
  45 u8 *bitq_in_buffer; /* buffer dynamically reallocated as needed */
  46 unsigned long bitq_in_bufsize=32; /* min. buffer size */
  47
  48
  49 /*
  50  * input queue processing does not use jtag_read_buffer() to avoid unnecessary overhead
  51  * also the buffer for incomming data is reallocated only if necessary
  52  * no parameters, makes use of stored state information
  53  */
  54 void bitq_in_proc(void)
  55 {
  56         /* static information preserved between calls to increase performance */
  57         static u8 *in_buff; /* pointer to buffer for scanned data */
  58         static int in_idx; /* index of byte being scanned */
  59         static u8 in_mask; /* mask of next bit to be scanned */
  60
  61         scan_field_t *field;
  62         int tdo;
  63
  64         /* loop through the queue */
  65         while (bitq_in_state.cmd) {
  66                 /* only JTAG_SCAN command may return data */
  67                 if (bitq_in_state.cmd->type==JTAG_SCAN) {
  68                         /* loop through the fields */
  69                         while (bitq_in_state.field_idx<bitq_in_state.cmd->cmd.scan->num_fields) {
  70
  71                                 field=&bitq_in_state.cmd->cmd.scan->fields[bitq_in_state.field_idx];
  72                                 if ( field->in_value || field->in_handler) {
  73
  74                                         if (bitq_in_state.bit_pos==0) {
  75                                                 /* initialize field scanning */
  76                                                 in_mask=0x01;
  77                                                 in_idx=0;
  78                                                 if (field->in_value) in_buff=field->in_value;
  79                                                 else {
  80                                                         /* buffer reallocation needed? */
  81                                                         if (field->num_bits>bitq_in_bufsize*8) {
  82                                                                 /* buffer previously allocated? */
  83                                                                 if (bitq_in_buffer!=NULL) {
  84                                                                         /* free it */
  85                                                                         free(bitq_in_buffer);
  86                                                                         bitq_in_buffer=NULL;
  87                                                                 }
  88                                                                 /* double the buffer size until it fits */
  89                                                                 while (field->num_bits>bitq_in_bufsize*8) bitq_in_bufsize*=2;
  90                                                         }
  91                                                         /* if necessary, allocate buffer and check for malloc error */
  92                                                         if (bitq_in_buffer==NULL && (bitq_in_buffer=malloc(bitq_in_bufsize))==NULL) {
  93                                                                 ERROR("malloc error");
  94                                                                 exit(-1);
  95                                                         }
  96                                                         in_buff=(void *)bitq_in_buffer;
  97                                                 }
  98                                         }
  99
 100                                         /* field scanning */
 101                                         while (bitq_in_state.bit_pos<field->num_bits) {
 102                                                 if ((tdo=bitq_interface->in())<0) {
 103 #ifdef _DEBUG_JTAG_IO_
 104                                                         DEBUG("bitq in EOF");
 105 #endif
 106                                                         return;
 107                                                 }
 108                                                 if (in_mask==0x01) in_buff[in_idx]=0;
 109                                                 if (tdo) in_buff[in_idx]|=in_mask;
 110                                                 if (in_mask==0x80) {
 111                                                         in_mask=0x01;
 112                                                         in_idx++;
 113                                                 }
 114                                                 else in_mask<<=1;
 115                                                 bitq_in_state.bit_pos++;
 116                                         }
 117
 118
 119                                         if (field->in_handler && bitq_in_state.status==ERROR_OK) {
 120                                                 bitq_in_state.status=(*field->in_handler)(in_buff, field->in_handler_priv, field);
 121                                         }
 122
 123                                 }
 124
 125                                 bitq_in_state.field_idx++; /* advance to next field */
 126                                 bitq_in_state.bit_pos=0; /* start next field from the first bit */
 127                         }
 128
 129                 }
 130                 bitq_in_state.cmd=bitq_in_state.cmd->next; /* advance to next command */
 131                 bitq_in_state.field_idx=0; /* preselect first field */
 132         }
 133 }
 134
 135
 136
 137 void bitq_io(int tms, int tdi, int tdo_req)
 138 {
 139         bitq_interface->out(tms, tdi, tdo_req);
 140         /* check and process the input queue */
 141         if (bitq_interface->in_rdy()) bitq_in_proc();
 142 }
 143
 144
 145 void bitq_end_state(enum tap_state state)
 146 {
 147         if (state==-1) return;
 148         if (tap_move_map[state]==-1) {
 149                 ERROR("BUG: %i is not a valid end state", state);
 150                 exit(-1);
 151         }
 152         end_state = state;
 153 }
 154
 155
 156 void bitq_state_move(enum tap_state new_state)
 157 {
 158         int i=0;
 159         u8 tms_scan;
 160
 161         if (tap_move_map[cur_state]==-1 || tap_move_map[new_state]==-1) {
 162                 ERROR("TAP move from or to unstable state");
 163                 exit(-1);
 164         }
 165
 166         tms_scan=TAP_MOVE(cur_state, new_state);
 167
 168         for (i=0; i<7; i++) {
 169                 bitq_io(tms_scan&1, 0, 0);
 170                 tms_scan>>=1;
 171         }
 172
 173         cur_state = new_state;
 174 }
 175
 176
 177 void bitq_path_move(pathmove_command_t *cmd)
 178 {
 179         int i;
 180
 181         for (i=0; i<=cmd->num_states; i++) {
 182                 if (tap_transitions[cur_state].low == cmd->path[i]) bitq_io(0, 0, 0);
 183                 else if (tap_transitions[cur_state].high == cmd->path[i]) bitq_io(1, 0, 0);
 184                 else {
 185                         ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_strings[cur_state], tap_state_strings[cmd->path[i]]);
 186                         exit(-1);
 187                 }
 188
 189                 cur_state = cmd->path[i];
 190         }
 191
 192         end_state = cur_state;
 193 }
 194
 195
 196 void bitq_runtest(int num_cycles)
 197 {
 198         int i;
 199
 200         /* only do a state_move when we're not already in RTI */
 201         if (cur_state != TAP_RTI) bitq_state_move(TAP_RTI);
 202
 203         /* execute num_cycles */
 204         for (i = 0; i < num_cycles; i++)
 205                 bitq_io(0, 0, 0);
 206
 207         /* finish in end_state */
 208         if (cur_state != end_state) bitq_state_move(end_state);
 209 }
 210
 211
 212 void bitq_scan_field(scan_field_t *field, int pause)
 213 {
 214         int bit_cnt;
 215         int tdo_req;
 216
 217         u8 *out_ptr;
 218         u8 out_mask;
 219
 220         if ( field->in_value || field->in_handler) tdo_req=1;
 221         else tdo_req=0;
 222
 223         if (field->out_value==NULL) {
 224                 /* just send zeros and request data from TDO */
 225                 for (bit_cnt=field->num_bits; bit_cnt>1; bit_cnt--)
 226                         bitq_io(0, 0, tdo_req);
 227                 bitq_io(pause, 0, tdo_req);
 228         }
 229         else {
 230                 /* send data, and optionally request TDO */
 231                 out_mask=0x01;
 232                 out_ptr=field->out_value;
 233                 for (bit_cnt=field->num_bits; bit_cnt>1; bit_cnt--) {
 234                         bitq_io(0, ((*out_ptr)&out_mask)!=0, tdo_req);
 235                         if (out_mask==0x80) {
 236                                 out_mask=0x01;
 237                                 out_ptr++;
 238                         }
 239                         else out_mask<<=1;
 240                 }
 241                 bitq_io(pause, ((*out_ptr)&out_mask)!=0, tdo_req);
 242         }
 243
 244         if (pause) {
 245                 bitq_io(0,0,0);
 246                 if (cur_state==TAP_SI) cur_state=TAP_PI;
 247                 else if (cur_state==TAP_SD) cur_state=TAP_PD;
 248         }
 249 }
 250
 251
 252 void bitq_scan(scan_command_t *cmd)
 253 {
 254         int i;
 255
 256         if (cmd->ir_scan) bitq_state_move(TAP_SI);
 257         else bitq_state_move(TAP_SD);
 258
 259         for (i=0; i < cmd->num_fields-1; i++)
 260                 bitq_scan_field(&cmd->fields[i], 0);
 261         bitq_scan_field(&cmd->fields[i], 1);
 262 }
 263
 264
 265 int bitq_execute_queue(void)
 266 {
 267         jtag_command_t *cmd = jtag_command_queue; /* currently processed command */
 268
 269         bitq_in_state.cmd = jtag_command_queue;
 270         bitq_in_state.field_idx = 0;
 271         bitq_in_state.bit_pos = 0;
 272         bitq_in_state.status = ERROR_OK;
 273
 274         while (cmd) {
 275
 276                 switch (cmd->type) {
 277
 278                         case JTAG_END_STATE:
 279 #ifdef _DEBUG_JTAG_IO_
 280                                 DEBUG("end_state: %i", cmd->cmd.end_state->end_state);
 281 #endif
 282                                 bitq_end_state(cmd->cmd.end_state->end_state);
 283                                 break;
 284
 285                         case JTAG_RESET:
 286 #ifdef _DEBUG_JTAG_IO_
 287                                 DEBUG("reset trst: %i srst %i", cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 288 #endif
 289                                 bitq_interface->reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 290                                 if (bitq_interface->in_rdy()) bitq_in_proc();
 291                                 break;
 292
 293                         case JTAG_RUNTEST:
 294 #ifdef _DEBUG_JTAG_IO_
 295                                 DEBUG("runtest %i cycles, end in %i", cmd->cmd.runtest->num_cycles, cmd->cmd.runtest->end_state);
 296 #endif
 297                                 bitq_end_state(cmd->cmd.runtest->end_state);
 298                                 bitq_runtest(cmd->cmd.runtest->num_cycles);
 299                                 break;
 300
 301                         case JTAG_STATEMOVE:
 302 #ifdef _DEBUG_JTAG_IO_
 303                                 DEBUG("statemove end in %i", cmd->cmd.statemove->end_state);
 304 #endif
 305                                 bitq_end_state(cmd->cmd.statemove->end_state);
 306                                 bitq_state_move(end_state); /* uncoditional TAP move */
 307                                 break;
 308
 309                         case JTAG_PATHMOVE:
 310 #ifdef _DEBUG_JTAG_IO_
 311                                 DEBUG("pathmove: %i states, end in %i", cmd->cmd.pathmove->num_states, cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]);
 312 #endif
 313                                 bitq_path_move(cmd->cmd.pathmove);
 314                                 break;
 315
 316                         case JTAG_SCAN:
 317 #ifdef _DEBUG_JTAG_IO_
 318                                 DEBUG("scan end in %i", cmd->cmd.scan->end_state);
 319                                 if (cmd->cmd.scan->ir_scan) DEBUG("scan ir");
 320                                 else DEBUG("scan dr");
 321 #endif
 322                                 bitq_end_state(cmd->cmd.scan->end_state);
 323                                 bitq_scan(cmd->cmd.scan);
 324                                 if (cur_state != end_state) bitq_state_move(end_state);
 325                                 break;
 326
 327                         case JTAG_SLEEP:
 328 #ifdef _DEBUG_JTAG_IO_
 329                                 DEBUG("sleep %i", cmd->cmd.sleep->us);
 330 #endif
 331                                 bitq_interface->sleep(cmd->cmd.sleep->us);
 332                                 if (bitq_interface->in_rdy()) bitq_in_proc();
 333                                 break;
 334
 335                         default:
 336                                 ERROR("BUG: unknown JTAG command type encountered");
 337                                 exit(-1);
 338                 }
 339
 340                 cmd = cmd->next;
 341         }
 342
 343         bitq_interface->flush();
 344         bitq_in_proc();
 345
 346         if (bitq_in_state.cmd) {
 347                 ERROR("missing data from bitq interface");
 348                 return ERROR_JTAG_QUEUE_FAILED;
 349         }
 350         if (bitq_interface->in()>=0) {
 351                 ERROR("extra data from bitq interface");
 352                 return ERROR_JTAG_QUEUE_FAILED;
 353         }
 354
 355         return bitq_in_state.status;
 356 }
 357
 358
 359 void bitq_cleanup(void)
 360 {
 361         if (bitq_in_buffer!=NULL)
 362         {
 363                 free(bitq_in_buffer);
 364                 bitq_in_buffer=NULL;
 365         }
 366 }