src/jtag/bitbang.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   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
  21 #include "bitbang.h"
  22
  23 /* project specific includes */
  24 #include "log.h"
  25 #include "types.h"
  26 #include "jtag.h"
  27 #include "configuration.h"
  28
  29 /* system includes */
  30 #include <string.h>
  31 #include <stdlib.h>
  32 #include <unistd.h>
  33
  34 #include <sys/time.h>
  35 #include <time.h>
  36
  37 bitbang_interface_t *bitbang_interface;
  38
  39 int bitbang_execute_queue(void);
  40
  41 void bitbang_end_state(enum tap_state state)
  42 {
  43         if (tap_move_map[state] != -1)
  44                 end_state = state;
  45         else
  46         {
  47                 ERROR("BUG: %i is not a valid end state", state);
  48                 exit(-1);
  49         }
  50 }
  51
  52 void bitbang_state_move(void) {
  53
  54         int i=0, tms=0;
  55         u8 tms_scan = TAP_MOVE(cur_state, end_state);
  56
  57         for (i = 0; i < 7; i++)
  58         {
  59                 tms = (tms_scan >> i) & 1;
  60                 bitbang_interface->write(0, tms, 0);
  61                 bitbang_interface->write(1, tms, 0);
  62         }
  63         bitbang_interface->write(0, tms, 0);
  64
  65         cur_state = end_state;
  66 }
  67
  68 void bitbang_runtest(int num_cycles)
  69 {
  70         int i;
  71
  72         enum tap_state saved_end_state = end_state;
  73
  74         /* only do a state_move when we're not already in RTI */
  75         if (cur_state != TAP_RTI)
  76         {
  77                 bitbang_end_state(TAP_RTI);
  78                 bitbang_state_move();
  79         }
  80
  81         /* execute num_cycles */
  82         bitbang_interface->write(0, 0, 0);
  83         for (i = 0; i < num_cycles; i++)
  84         {
  85                 bitbang_interface->write(1, 0, 0);
  86                 bitbang_interface->write(0, 0, 0);
  87         }
  88
  89         /* finish in end_state */
  90         bitbang_end_state(saved_end_state);
  91         if (cur_state != end_state)
  92                 bitbang_state_move();
  93 }
  94
  95 void bitbang_scan(int ir_scan, enum scan_type type, u8 *buffer, int scan_size)
  96 {
  97         enum tap_state saved_end_state = end_state;
  98         int bit_cnt;
  99
 100         if (ir_scan)
 101                 bitbang_end_state(TAP_SI);
 102         else
 103                 bitbang_end_state(TAP_SD);
 104
 105         bitbang_state_move();
 106         bitbang_end_state(saved_end_state);
 107
 108         for (bit_cnt = 0; bit_cnt < scan_size; bit_cnt++)
 109         {
 110                 if ((buffer[bit_cnt/8] >> (bit_cnt % 8)) & 0x1) {
 111                         bitbang_interface->write(0, (bit_cnt==scan_size-1) ? 1 : 0, 1);
 112                         bitbang_interface->write(1, (bit_cnt==scan_size-1) ? 1 : 0, 1);
 113                 } else {
 114                         bitbang_interface->write(0, (bit_cnt==scan_size-1) ? 1 : 0, 0);
 115                         bitbang_interface->write(1, (bit_cnt==scan_size-1) ? 1 : 0, 0);
 116                 }
 117
 118                 if (type != SCAN_OUT)
 119                 {
 120                         if (bitbang_interface->read())
 121                                 buffer[(bit_cnt)/8] |= 1 << ((bit_cnt) % 8);
 122                         else
 123                                 buffer[(bit_cnt)/8] &= ~(1 << ((bit_cnt) % 8));
 124                 }
 125         }
 126
 127         /* Exit1 -> Pause */
 128         bitbang_interface->write(0, 0, 0);
 129         bitbang_interface->write(1, 0, 0);
 130
 131         if (ir_scan)
 132                 cur_state = TAP_PI;
 133         else
 134                 cur_state = TAP_PD;
 135
 136         if (cur_state != end_state)
 137                 bitbang_state_move();
 138 }
 139
 140 int bitbang_execute_queue(void)
 141 {
 142         jtag_command_t *cmd = jtag_command_queue; /* currently processed command */
 143         int scan_size;
 144         enum scan_type type;
 145         u8 *buffer;
 146
 147         if (!bitbang_interface)
 148         {
 149                 ERROR("BUG: Bitbang interface called, but not yet initialized");
 150                 exit(-1);
 151         }
 152
 153         while (cmd)
 154         {
 155                 switch (cmd->type)
 156                 {
 157                         case JTAG_END_STATE:
 158 #ifdef _DEBUG_JTAG_IO_
 159                                 DEBUG("end_state: %i", cmd->cmd.end_state->end_state);
 160 #endif
 161                                 if (cmd->cmd.end_state->end_state != -1)
 162                                         bitbang_end_state(cmd->cmd.end_state->end_state);
 163                                 break;
 164                         case JTAG_RESET:
 165 #ifdef _DEBUG_JTAG_IO_
 166                                 DEBUG("reset trst: %i srst %i", cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 167 #endif
 168                                 if (cmd->cmd.reset->trst == 1)
 169                                 {
 170                                         cur_state = TAP_TLR;
 171                                 }
 172                                 bitbang_interface->reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 173                                 break;
 174                         case JTAG_RUNTEST:
 175 #ifdef _DEBUG_JTAG_IO_
 176                                 DEBUG("runtest %i cycles, end in %i", cmd->cmd.runtest->num_cycles, cmd->cmd.runtest->end_state);
 177 #endif
 178                                 if (cmd->cmd.runtest->end_state != -1)
 179                                         bitbang_end_state(cmd->cmd.runtest->end_state);
 180                                 bitbang_runtest(cmd->cmd.runtest->num_cycles);
 181                                 break;
 182                         case JTAG_STATEMOVE:
 183 #ifdef _DEBUG_JTAG_IO_
 184                                 DEBUG("statemove end in %i", cmd->cmd.statemove->end_state);
 185 #endif
 186                                 if (cmd->cmd.statemove->end_state != -1)
 187                                         bitbang_end_state(cmd->cmd.statemove->end_state);
 188                                 bitbang_state_move();
 189                                 break;
 190                         case JTAG_SCAN:
 191 #ifdef _DEBUG_JTAG_IO_
 192                                 DEBUG("scan end in %i", cmd->cmd.scan->end_state);
 193 #endif
 194                                 if (cmd->cmd.scan->end_state != -1)
 195                                         bitbang_end_state(cmd->cmd.scan->end_state);
 196                                 scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
 197                                 type = jtag_scan_type(cmd->cmd.scan);
 198                                 bitbang_scan(cmd->cmd.scan->ir_scan, type, buffer, scan_size);
 199                                 if (jtag_read_buffer(buffer, cmd->cmd.scan) != ERROR_OK)
 200                                         return ERROR_JTAG_QUEUE_FAILED;
 201                                 if (buffer)
 202                                         free(buffer);
 203                                 break;
 204                         case JTAG_SLEEP:
 205 #ifdef _DEBUG_JTAG_IO_
 206                                 DEBUG("sleep", cmd->cmd.sleep->us);
 207 #endif
 208                                 jtag_sleep(cmd->cmd.sleep->us);
 209                                 break;
 210                         default:
 211                                 ERROR("BUG: unknown JTAG command type encountered");
 212                                 exit(-1);
 213                 }
 214                 cmd = cmd->next;
 215         }
 216
 217         return ERROR_OK;
 218 }
 219