git.zerfleddert.de Git - usb-driver/blob - jtagkey.c

   1 #include <stdio.h>
   2 #include <ftdi.h>
   3 #include <unistd.h>
   4 #include <pthread.h>
   5 #include "usb-driver.h"
   6 #include "config.h"
   7 #include "jtagkey.h"
   8
   9 #define USBBUFSIZE 1048576
  10 #define JTAG_SPEED 100000
  11 #define SLOW_AND_SAFE 1
  12
  13 static struct ftdi_context ftdic;
  14 static unsigned char bitbang_mode;
  15
  16 static int jtagkey_init(unsigned short vid, unsigned short pid) {
  17         int ret = 0;
  18         unsigned char c;
  19
  20         if ((ret = ftdi_init(&ftdic)) != 0) {
  21                 fprintf(stderr, "unable to initialise libftdi: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  22                 return ret;
  23         }
  24
  25         if ((ret = ftdi_usb_open(&ftdic, vid, pid)) != 0) {
  26                 fprintf(stderr, "unable to open ftdi device: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  27                 return ret;
  28         }
  29
  30         if ((ret = ftdi_usb_reset(&ftdic)) != 0) {
  31                 fprintf(stderr, "unable reset device: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  32                 return ret;
  33         }
  34
  35         if ((ret = ftdi_set_interface(&ftdic, INTERFACE_A)) != 0) {
  36                 fprintf(stderr, "unable to set interface: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  37                 return ret;
  38         }
  39
  40         if ((ret = ftdi_write_data_set_chunksize(&ftdic, USBBUFSIZE))  != 0) {
  41                 fprintf(stderr, "unable to set write chunksize: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  42                 return ret;
  43         }
  44
  45         if ((ret = ftdi_read_data_set_chunksize(&ftdic, USBBUFSIZE))  != 0) {
  46                 fprintf(stderr, "unable to set read chunksize: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  47                 return ret;
  48         }
  49
  50         if ((ret = ftdi_set_latency_timer(&ftdic, 1))  != 0) {
  51                 fprintf(stderr, "unable to set latency timer: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  52                 return ret;
  53         }
  54
  55         c = 0x00;
  56         ftdi_write_data(&ftdic, &c, 1);
  57
  58         if ((ret = ftdi_set_bitmode(&ftdic, JTAGKEY_TCK|JTAGKEY_TDI|JTAGKEY_TMS|JTAGKEY_OEn, BITMODE_SYNCBB))  != 0) {
  59                 fprintf(stderr, "unable to enable bitbang mode: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  60                 return ret;
  61         }
  62
  63         if ((ret = ftdi_set_baudrate(&ftdic, JTAG_SPEED))  != 0) {
  64                 fprintf(stderr, "unable to set baudrate: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  65                 return ret;
  66         }
  67
  68         bitbang_mode = BITMODE_SYNCBB;
  69
  70         if ((ret = ftdi_usb_purge_buffers(&ftdic))  != 0) {
  71                 fprintf(stderr, "unable to purge buffers: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  72                 return ret;
  73         }
  74
  75         return ret;
  76 }
  77
  78 int jtagkey_open(int num) {
  79         int ret;
  80
  81         ret = jtagkey_init(config_usb_vid(num), config_usb_pid(num));
  82
  83         if (ret >= 0)
  84                 ret = 0xff;
  85
  86         return ret;
  87 }
  88
  89 void jtagkey_close(int handle) {
  90         if (handle == 0xff) {
  91                 ftdi_disable_bitbang(&ftdic);
  92                 ftdi_usb_close(&ftdic);
  93                 ftdi_deinit(&ftdic);
  94         }
  95 }
  96
  97 #ifndef SLOW_AND_SAFE
  98 static int jtagkey_set_bbmode(unsigned char mode) {
  99         int ret = 0;
 100
 101         if (bitbang_mode != mode) {
 102                 DPRINTF("switching bitbang-mode!\n");
 103
 104                 /* Wait for the latency-timer to kick in */
 105                 usleep(2);
 106                 if ((ret = ftdi_set_bitmode(&ftdic, JTAGKEY_TCK|JTAGKEY_TDI|JTAGKEY_TMS|JTAGKEY_OEn, mode))  != 0) {
 107                         fprintf(stderr, "unable to enable bitbang mode: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
 108                         return ret;
 109                 }
 110                 if ((ret = ftdi_usb_purge_buffers(&ftdic))  != 0) {
 111                         fprintf(stderr, "unable to purge buffers: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
 112                         return ret;
 113                 }
 114                 /* Wait for the FTDI2232 to settle */
 115                 usleep(2);
 116
 117                 bitbang_mode = mode;
 118         }
 119
 120         return ret;
 121 }
 122 #endif
 123
 124 void jtagkey_state(unsigned char data) {
 125         fprintf(stderr,"Pins high: ");
 126
 127         if (data & JTAGKEY_TCK)
 128                 fprintf(stderr,"TCK ");
 129
 130         if (data & JTAGKEY_TDI)
 131                 fprintf(stderr,"TDI ");
 132
 133         if (data & JTAGKEY_TDO)
 134                 fprintf(stderr,"TDO ");
 135
 136         if (data & JTAGKEY_TMS)
 137                 fprintf(stderr,"TMS ");
 138
 139         if (data & JTAGKEY_VREF)
 140                 fprintf(stderr,"VREF ");
 141
 142         fprintf(stderr,"\n");
 143 }
 144
 145 struct jtagkey_reader_arg {
 146         int             num;
 147         unsigned char   *buf;
 148 };
 149
 150 static void *jtagkey_reader(void *thread_arg) {
 151         struct jtagkey_reader_arg *arg = (struct jtagkey_reader_arg*)thread_arg;
 152
 153         int i;
 154
 155         i = 0;
 156         DPRINTF("reader for %d bytes\n", arg->num);
 157         while (i < arg->num) {
 158                 i += ftdi_read_data(&ftdic, arg->buf + i, arg->num - i);
 159         }
 160
 161         pthread_exit(NULL);
 162 }
 163
 164 int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase, int ecpbase, int num) {
 165         int ret = 0;
 166         int i;
 167         int nread = 0;
 168         unsigned long port;
 169         unsigned char val;
 170         static unsigned char last_data = 0;
 171         static unsigned char last_write = 0x00;
 172         static unsigned char writebuf[USBBUFSIZE], *writepos = writebuf;
 173         static unsigned char readbuf[USBBUFSIZE], *readpos;
 174         unsigned char data, prev_data;
 175         struct jtagkey_reader_arg targ;
 176         pthread_t reader_thread;
 177
 178         /* Count reads */
 179         for (i = 0; i < num; i++)
 180                 if (tr[i].cmdTrans == PP_READ)
 181                         nread++;
 182
 183         /* Write combining */
 184         if ((writepos-writebuf > sizeof(writebuf)-num) || (nread && writepos-writebuf)) {
 185                 unsigned char *pos = writebuf;
 186                 int len;
 187
 188                 DPRINTF("writing %d bytes due to %d following reads in %d chunks or full buffer\n", writepos-writebuf, nread, num);
 189
 190 #ifndef SLOW_AND_SAFE
 191                 jtagkey_set_bbmode(BITMODE_BITBANG);
 192 #endif
 193 #ifdef SLOW_AND_SAFE
 194                 targ.num = writepos-pos;
 195                 targ.buf = readbuf;
 196                 pthread_create(&reader_thread, NULL, &jtagkey_reader, &targ);
 197 #endif
 198                 while (pos < writepos) {
 199                         len = writepos-pos;
 200
 201                         if (len > USBBUFSIZE)
 202                                 len = USBBUFSIZE;
 203
 204                         DPRINTF("combined write of %d/%d\n",len,writepos-pos);
 205                         ftdi_write_data(&ftdic, pos, len);
 206                         pos += len;
 207                 }
 208 #ifdef SLOW_AND_SAFE
 209                 pthread_join(reader_thread, NULL);
 210 #endif
 211
 212                 writepos = writebuf;
 213         }
 214
 215         for (i = 0; i < num; i++) {
 216                 DPRINTF("dwPort: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
 217                                 (unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
 218                                 tr[i].fAutoinc, tr[i].dwOptions);
 219
 220                 port = (unsigned long)tr[i].dwPort;
 221                 val = tr[i].Data.Byte;
 222
 223 #ifdef DEBUG
 224                 if (tr[i].cmdTrans == 13)
 225                         DPRINTF("write byte: %d\n", val);
 226 #endif
 227
 228                 /* Pad writebuf for read-commands in stream */
 229                 *writepos = last_data;
 230                 prev_data = last_data;
 231
 232                 if (port == ppbase + PP_DATA) {
 233                         DPRINTF("data port\n");
 234
 235                         data = 0x00;
 236                         switch(tr[i].cmdTrans) {
 237                                 case PP_READ:
 238                                         ret = 0; /* We don't support reading of the data port */
 239                                         break;
 240
 241                                 case PP_WRITE:
 242                                         if (val & PP_TDI) {
 243                                                 data |= JTAGKEY_TDI;
 244                                                 DPRINTF("TDI\n");
 245                                         } else {
 246                                                 DPRINTF("!TDI\n");
 247                                         }
 248                                         if (val & PP_TCK) {
 249                                                 data |= JTAGKEY_TCK;
 250                                                 DPRINTF("TCK\n");
 251                                         } else {
 252                                                 DPRINTF("!TCK\n");
 253                                         }
 254                                         if (val & PP_TMS) {
 255                                                 data |= JTAGKEY_TMS;
 256                                                 DPRINTF("TMS\n");
 257                                         } else {
 258                                                 DPRINTF("!TMS\n");
 259                                         }
 260                                         if (val & PP_CTRL) {
 261                                                 data = JTAGKEY_OEn;
 262                                                 DPRINTF("CTRL\n");
 263                                         } else {
 264                                                 DPRINTF("!CTRL\n");
 265                                         }
 266
 267                                         if (val & PP_PROG) {
 268                                                 DPRINTF("PROG\n");
 269                                         } else {
 270                                                 DPRINTF("!PROG\n");
 271                                         }
 272
 273                                         *writepos = data;
 274
 275                                         last_data = data;
 276                                         last_write = val;
 277                                         break;
 278
 279                                 default:
 280                                         fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
 281                                         ret = -1;
 282                                         break;
 283                         }
 284                 }
 285
 286                 if (nread || (*writepos != prev_data) || (i == num-1))
 287                         writepos++;
 288         }
 289
 290         if (nread)
 291         {
 292                 DPRINTF("writing %d bytes\n", writepos-writebuf);
 293
 294                 *writepos = last_data;
 295                 writepos++;
 296
 297 #ifndef SLOW_AND_SAFE
 298                 jtagkey_set_bbmode(BITMODE_SYNCBB);
 299 #endif
 300                 targ.num = writepos-writebuf;
 301                 targ.buf = readbuf;
 302                 pthread_create(&reader_thread, NULL, &jtagkey_reader, &targ);
 303                 ftdi_write_data(&ftdic, writebuf, writepos-writebuf);
 304                 pthread_join(reader_thread, NULL);
 305
 306 #ifdef DEBUG
 307                 DPRINTF("write: ");
 308                 hexdump(writebuf, writepos-writebuf);
 309                 DPRINTF("read: ");
 310                 hexdump(readbuf, i);
 311 #endif
 312
 313                 writepos = writebuf;
 314         } else {
 315                 return ret;
 316         }
 317
 318         readpos = readbuf;
 319
 320         for (i = 0; i < num; i++) {
 321                 DPRINTF("dwPort: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
 322                                 (unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
 323                                 tr[i].fAutoinc, tr[i].dwOptions);
 324
 325                 port = (unsigned long)tr[i].dwPort;
 326                 val = tr[i].Data.Byte;
 327                 readpos++;
 328
 329                 if (port == ppbase + PP_DATA) {
 330                         if (tr[i].cmdTrans == PP_WRITE) {
 331                                 last_write = val;
 332                         }
 333                 } else if (port == ppbase + PP_STATUS) {
 334                         DPRINTF("status port (last write: 0x%x)\n", last_write);
 335                         switch(tr[i].cmdTrans) {
 336                                 case PP_READ:
 337                                         data = *readpos;
 338
 339 #ifdef DEBUG
 340                                         DPRINTF("READ: 0x%x\n", data);
 341                                         jtagkey_state(data);
 342 #endif
 343
 344                                         val = 0x00;
 345                                         if ((data & JTAGKEY_TDO) && (last_write & PP_PROG))
 346                                                 val |= PP_TDO;
 347
 348                                         if (!(last_write & PP_PROG))
 349                                                 val |= 0x08;
 350
 351                                         if (last_write & 0x40)
 352                                                 val |= 0x20;
 353                                         else
 354                                                 val |= 0x80;
 355                                         break;
 356
 357                                 case PP_WRITE:
 358                                         ret = 0; /* Status Port is readonly */
 359                                         break;
 360
 361                                 default:
 362                                         fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
 363                                         ret = -1;
 364                                         break;
 365                         }
 366                 } else {
 367                         ret = 0;
 368                 }
 369
 370                 tr[i].Data.Byte = val;
 371
 372                 DPRINTF("dwPortReturn: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
 373                                 (unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
 374                                 tr[i].fAutoinc, tr[i].dwOptions);
 375 #ifdef DEBUG
 376                 if (tr[i].cmdTrans == 10)
 377                         DPRINTF("read byte: %d\n", tr[i].Data.Byte);
 378 #endif
 379         }
 380
 381         return ret;
 382 }