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