src/jtag/drivers/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 <jtag/jtag.h>
  25 #include "bitq.h"
  26 #include <jtag/interface.h>
  27
  28
  29 struct bitq_interface* bitq_interface;       /* low level bit queue interface */
  30
  31 /* state of input queue */
  32 struct bitq_state {
  33         struct jtag_command *cmd; /* command currently processed */
  34         int field_idx; /* index of field currently being processed */
  35         int bit_pos; /* position of bit currently being processed */
  36         int status; /* processing status */
  37 };
  38 static struct bitq_state bitq_in_state;
  39
  40 /*
  41  * input queue processing does not use jtag_read_buffer() to avoid unnecessary overhead
  42  * no parameters, makes use of stored state information
  43  */
  44 static void bitq_in_proc(void)
  45 {
  46         /* loop through the queue */
  47         while (bitq_in_state.cmd)
  48         {
  49                 /* only JTAG_SCAN command may return data */
  50                 if (bitq_in_state.cmd->type == JTAG_SCAN)
  51                 {
  52                         /* loop through the fields */
  53                         while (bitq_in_state.field_idx < bitq_in_state.cmd->cmd.scan->num_fields)
  54                         {
  55                                 struct scan_field *field;
  56                                 field = &bitq_in_state.cmd->cmd.scan->fields[bitq_in_state.field_idx];
  57                                 if (field->in_value)
  58                                 {
  59                                         /* field scanning */
  60                                         while (bitq_in_state.bit_pos < field->num_bits)
  61                                         {
  62                                                 /* index of byte being scanned */
  63                                                 int in_idx = bitq_in_state.bit_pos / 8;
  64                                                 /* mask of next bit to be scanned */
  65                                                 uint8_t in_mask = 1 << (bitq_in_state.bit_pos % 8);
  66
  67                                                 int tdo = bitq_interface->in();
  68                                                 if (tdo < 0)
  69                                                 {
  70 #ifdef _DEBUG_JTAG_IO_
  71                                                         LOG_DEBUG("bitq in EOF");
  72 #endif
  73                                                         return;
  74                                                 }
  75                                                 if (in_mask == 0x01)
  76                                                         field->in_value[in_idx] = 0;
  77                                                 if (tdo)
  78                                                         field->in_value[in_idx] |= in_mask;
  79                                                 bitq_in_state.bit_pos++;
  80                                         }
  81                                 }
  82
  83                                 bitq_in_state.field_idx++;  /* advance to next field */
  84                                 bitq_in_state.bit_pos = 0;  /* start next field from the first bit */
  85                         }
  86                 }
  87                 bitq_in_state.cmd = bitq_in_state.cmd->next;    /* advance to next command */
  88                 bitq_in_state.field_idx = 0;                    /* preselect first field */
  89         }
  90 }
  91
  92
  93 static void bitq_io(int tms, int tdi, int tdo_req)
  94 {
  95         bitq_interface->out(tms, tdi, tdo_req);
  96         /* check and process the input queue */
  97         if (bitq_interface->in_rdy())
  98                 bitq_in_proc();
  99 }
 100
 101
 102 static void bitq_end_state(tap_state_t state)
 103 {
 104         if (!tap_is_state_stable(state))
 105         {
 106                 LOG_ERROR("BUG: %i is not a valid end state", state);
 107                 exit(-1);
 108         }
 109         tap_set_end_state(state);
 110 }
 111
 112
 113 static void bitq_state_move(tap_state_t new_state)
 114 {
 115         int i = 0;
 116         uint8_t  tms_scan;
 117
 118         if (!tap_is_state_stable(tap_get_state()) || !tap_is_state_stable(new_state))
 119         {
 120                 LOG_ERROR("TAP move from or to unstable state");
 121                 exit(-1);
 122         }
 123
 124         tms_scan = tap_get_tms_path(tap_get_state(), new_state);
 125         int tms_count = tap_get_tms_path_len(tap_get_state(), tap_get_end_state());
 126
 127         for (i = 0; i < tms_count; i++)
 128         {
 129                 bitq_io(tms_scan & 1, 0, 0);
 130                 tms_scan >>= 1;
 131         }
 132
 133         tap_set_state(new_state);
 134 }
 135
 136
 137 static void bitq_path_move(struct pathmove_command *cmd)
 138 {
 139         int i;
 140
 141         for (i = 0; i <= cmd->num_states; i++)
 142         {
 143                 if (tap_state_transition(tap_get_state(), false) == cmd->path[i])
 144                         bitq_io(0, 0, 0);
 145                 else if (tap_state_transition(tap_get_state(), true) == cmd->path[i])
 146                         bitq_io(1, 0, 0);
 147                 else
 148                 {
 149                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_name(
 150                                                          tap_get_state()), tap_state_name(cmd->path[i]));
 151                         exit(-1);
 152                 }
 153
 154                 tap_set_state(cmd->path[i]);
 155         }
 156
 157         tap_set_end_state(tap_get_state());
 158 }
 159
 160
 161 static void bitq_runtest(int num_cycles)
 162 {
 163         int i;
 164
 165         /* only do a state_move when we're not already in IDLE */
 166         if (tap_get_state() != TAP_IDLE)
 167                 bitq_state_move(TAP_IDLE);
 168
 169         /* execute num_cycles */
 170         for (i = 0; i < num_cycles; i++)
 171                 bitq_io(0, 0, 0);
 172
 173         /* finish in end_state */
 174         if (tap_get_state() != tap_get_end_state())
 175                 bitq_state_move(tap_get_end_state());
 176 }
 177
 178
 179 static void bitq_scan_field(struct scan_field *field, int do_pause)
 180 {
 181         int bit_cnt;
 182         int tdo_req;
 183
 184         const uint8_t* out_ptr;
 185         uint8_t  out_mask;
 186
 187         if (field->in_value)
 188                 tdo_req = 1;
 189         else
 190                 tdo_req = 0;
 191
 192         if (field->out_value == NULL)
 193         {
 194                 /* just send zeros and request data from TDO */
 195                 for (bit_cnt = field->num_bits; bit_cnt > 1; bit_cnt--)
 196                         bitq_io(0, 0, tdo_req);
 197
 198                 bitq_io(do_pause, 0, tdo_req);
 199         }
 200         else
 201         {
 202                 /* send data, and optionally request TDO */
 203                 out_mask = 0x01;
 204                 out_ptr  = field->out_value;
 205                 for (bit_cnt = field->num_bits; bit_cnt > 1; bit_cnt--)
 206                 {
 207                         bitq_io(0, ((*out_ptr) & out_mask) != 0, tdo_req);
 208                         if (out_mask == 0x80)
 209                         {
 210                                 out_mask = 0x01;
 211                                 out_ptr++;
 212                         }
 213                         else
 214                                 out_mask <<= 1;
 215                 }
 216
 217                 bitq_io(do_pause, ((*out_ptr) & out_mask) != 0, tdo_req);
 218         }
 219
 220         if (do_pause)
 221         {
 222                 bitq_io(0, 0, 0);
 223                 if (tap_get_state() == TAP_IRSHIFT)
 224                         tap_set_state(TAP_IRPAUSE);
 225                 else if (tap_get_state() == TAP_DRSHIFT)
 226                         tap_set_state(TAP_DRPAUSE);
 227         }
 228 }
 229
 230
 231 static void bitq_scan(struct scan_command *cmd)
 232 {
 233         int i;
 234
 235         if (cmd->ir_scan)
 236                 bitq_state_move(TAP_IRSHIFT);
 237         else
 238                 bitq_state_move(TAP_DRSHIFT);
 239
 240         for (i = 0; i < cmd->num_fields - 1; i++)
 241                 bitq_scan_field(&cmd->fields[i], 0);
 242
 243         bitq_scan_field(&cmd->fields[i], 1);
 244 }
 245
 246
 247 int bitq_execute_queue(void)
 248 {
 249         struct jtag_command* cmd = jtag_command_queue; /* currently processed command */
 250
 251         bitq_in_state.cmd = jtag_command_queue;
 252         bitq_in_state.field_idx = 0;
 253         bitq_in_state.bit_pos   = 0;
 254         bitq_in_state.status    = ERROR_OK;
 255
 256         while (cmd)
 257         {
 258                 switch (cmd->type)
 259                 {
 260                 case JTAG_RESET:
 261 #ifdef _DEBUG_JTAG_IO_
 262                         LOG_DEBUG("reset trst: %i srst %i", cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 263 #endif
 264                         if ((cmd->cmd.reset->trst == 1) || (cmd->cmd.reset->srst && (jtag_get_reset_config() & RESET_SRST_PULLS_TRST)))
 265                         {
 266                                 tap_set_state(TAP_RESET);
 267                         }
 268                         bitq_interface->reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 269                         if (bitq_interface->in_rdy())
 270                                 bitq_in_proc();
 271                         break;
 272
 273                 case JTAG_RUNTEST:
 274 #ifdef _DEBUG_JTAG_IO_
 275                         LOG_DEBUG("runtest %i cycles, end in %i", cmd->cmd.runtest->num_cycles, cmd->cmd.runtest->end_state);
 276 #endif
 277                         bitq_end_state(cmd->cmd.runtest->end_state);
 278                         bitq_runtest(cmd->cmd.runtest->num_cycles);
 279                         break;
 280
 281                 case JTAG_TLR_RESET:
 282 #ifdef _DEBUG_JTAG_IO_
 283                         LOG_DEBUG("statemove end in %i", cmd->cmd.statemove->end_state);
 284 #endif
 285                         bitq_end_state(cmd->cmd.statemove->end_state);
 286                         bitq_state_move(tap_get_end_state());   /* uncoditional TAP move */
 287                         break;
 288
 289                 case JTAG_PATHMOVE:
 290 #ifdef _DEBUG_JTAG_IO_
 291                         LOG_DEBUG("pathmove: %i states, end in %i", cmd->cmd.pathmove->num_states,
 292                                         cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]);
 293 #endif
 294                         bitq_path_move(cmd->cmd.pathmove);
 295                         break;
 296
 297                 case JTAG_SCAN:
 298 #ifdef _DEBUG_JTAG_IO_
 299                         LOG_DEBUG("scan end in %i", cmd->cmd.scan->end_state);
 300                         if (cmd->cmd.scan->ir_scan)
 301                                 LOG_DEBUG("scan ir");
 302                         else
 303                                 LOG_DEBUG("scan dr");
 304 #endif
 305                         bitq_end_state(cmd->cmd.scan->end_state);
 306                         bitq_scan(cmd->cmd.scan);
 307                         if (tap_get_state() != tap_get_end_state())
 308                                 bitq_state_move(tap_get_end_state());
 309                         break;
 310
 311                 case JTAG_SLEEP:
 312 #ifdef _DEBUG_JTAG_IO_
 313                         LOG_DEBUG("sleep %i", cmd->cmd.sleep->us);
 314 #endif
 315                         bitq_interface->sleep(cmd->cmd.sleep->us);
 316                         if (bitq_interface->in_rdy())
 317                                 bitq_in_proc();
 318                         break;
 319
 320                 default:
 321                         LOG_ERROR("BUG: unknown JTAG command type encountered");
 322                         exit(-1);
 323                 }
 324
 325                 cmd = cmd->next;
 326         }
 327
 328         bitq_interface->flush();
 329         bitq_in_proc();
 330
 331         if (bitq_in_state.cmd)
 332         {
 333                 LOG_ERROR("missing data from bitq interface");
 334                 return ERROR_JTAG_QUEUE_FAILED;
 335         }
 336         if (bitq_interface->in() >= 0)
 337         {
 338                 LOG_ERROR("extra data from bitq interface");
 339                 return ERROR_JTAG_QUEUE_FAILED;
 340         }
 341
 342         return bitq_in_state.status;
 343 }
 344
 345
 346 void bitq_cleanup(void)
 347 {
 348 }