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

   1 #include <stdio.h>
   2 #include <ftdi.h>
   3 #include "usb-driver.h"
   4 #include "jtagkey.h"
   5
   6 #define USBBUFSIZE 4096
   7
   8 static struct ftdi_context ftdic;
   9 static unsigned int usb_maxlen = 0;
  10
  11 int jtagkey_init(unsigned short vid, unsigned short pid) {
  12         int ret = 0;
  13         unsigned char c;
  14
  15         if ((ret = ftdi_init(&ftdic)) != 0) {
  16                 fprintf(stderr, "unable to initialise libftdi: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  17                 return ret;
  18         }
  19
  20         if ((ret = ftdi_usb_open(&ftdic, vid, pid)) != 0) {
  21                 fprintf(stderr, "unable to open ftdi device: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  22                 return ret;
  23         }
  24
  25         if ((ret = ftdi_usb_reset(&ftdic)) != 0) {
  26                 fprintf(stderr, "unable reset device: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  27                 return ret;
  28         }
  29
  30         if ((ret = ftdi_set_interface(&ftdic, INTERFACE_A)) != 0) {
  31                 fprintf(stderr, "unable to set interface: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  32                 return ret;
  33         }
  34
  35
  36         if ((ret = ftdi_write_data_get_chunksize(&ftdic, &usb_maxlen))  != 0) {
  37                 fprintf(stderr, "unable to get write chunksize: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  38                 return ret;
  39         }
  40
  41         if ((ret = ftdi_set_latency_timer(&ftdic, 1))  != 0) {
  42                 fprintf(stderr, "unable to set latency timer: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  43                 return ret;
  44         }
  45
  46         if ((ret = ftdi_set_baudrate(&ftdic, 500000))  != 0) {
  47                 fprintf(stderr, "unable to set baudrate: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  48                 return ret;
  49         }
  50
  51         c = 0x00;
  52         ftdi_write_data(&ftdic, &c, 1);
  53
  54         if ((ret = ftdi_set_bitmode(&ftdic, JTAGKEY_TCK|JTAGKEY_TDI|JTAGKEY_TMS|JTAGKEY_OEn, BITMODE_BITBANG))  != 0) {
  55                 fprintf(stderr, "unable to enable bitbang mode: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  56                 return ret;
  57         }
  58
  59         if ((ret = ftdi_usb_purge_buffers(&ftdic))  != 0) {
  60                 fprintf(stderr, "unable to purge buffers: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
  61                 return ret;
  62         }
  63
  64         return ret;
  65 }
  66
  67 void jtagkey_close() {
  68         ftdi_disable_bitbang(&ftdic);
  69         ftdi_usb_close(&ftdic);
  70         ftdi_deinit(&ftdic);
  71 }
  72
  73 void jtagkey_state(unsigned char data) {
  74         fprintf(stderr,"Pins high: ");
  75
  76         if (data & JTAGKEY_TCK)
  77                 fprintf(stderr,"TCK ");
  78
  79         if (data & JTAGKEY_TDI)
  80                 fprintf(stderr,"TDI ");
  81
  82         if (data & JTAGKEY_TDO)
  83                 fprintf(stderr,"TDO ");
  84
  85         if (data & JTAGKEY_TMS)
  86                 fprintf(stderr,"TMS ");
  87
  88         if (data & JTAGKEY_VREF)
  89                 fprintf(stderr,"VREF ");
  90
  91         fprintf(stderr,"\n");
  92 }
  93
  94 int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase, int ecpbase, int num) {
  95         int ret = 0;
  96         int i;
  97         int nread = 0;
  98         unsigned long port;
  99         unsigned char val;
 100         static unsigned char last_data = 0;
 101         static unsigned char last_write = 0x00;
 102         static unsigned char writebuf[USBBUFSIZE], *writepos = writebuf;
 103         static unsigned char readbuf[USBBUFSIZE], *readpos;
 104         unsigned char data, prev_data;
 105
 106         /* Count reads */
 107         for (i = 0; i < num; i++)
 108                 if (tr[i].cmdTrans == PP_READ)
 109                         nread++;
 110
 111         /* Write combining */
 112         if ((writepos-writebuf > sizeof(writebuf)-num) || (nread && writepos-writebuf)) {
 113                 unsigned char *pos = writebuf;
 114                 int len;
 115                 DPRINTF("writing %d bytes due to %d following reads in %d chunks or full buffer\n", writepos-writebuf, nread, num);
 116
 117                 while (pos < writepos) {
 118                         len = writepos-pos;
 119
 120                         if (len > usb_maxlen)
 121                                 len = usb_maxlen;
 122
 123                         DPRINTF("combined write of %d/%d\n",len,writepos-pos);
 124                         ftdi_write_data(&ftdic, pos, len);
 125                         pos += len;
 126                 }
 127
 128                 DPRINTF("read %d/%d bytes\n", i, writepos-writebuf);
 129                 writepos = writebuf;
 130         }
 131
 132         for (i = 0; i < num; i++) {
 133                 DPRINTF("dwPort: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
 134                                 (unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
 135                                 tr[i].fAutoinc, tr[i].dwOptions);
 136
 137                 port = (unsigned long)tr[i].dwPort;
 138                 val = tr[i].Data.Byte;
 139
 140 #ifdef DEBUG
 141                 if (tr[i].cmdTrans == 13)
 142                         DPRINTF("write byte: %d\n", val);
 143 #endif
 144
 145                 /* Pad writebuf for read-commands in stream */
 146                 *writepos = last_data;
 147                 prev_data = last_data;
 148
 149                 if (port == ppbase + PP_DATA) {
 150                         DPRINTF("data port\n");
 151
 152                         data = 0x00;
 153                         switch(tr[i].cmdTrans) {
 154                                 case PP_READ:
 155                                         ret = 0; /* We don't support reading of the data port */
 156                                         break;
 157
 158                                 case PP_WRITE:
 159                                         if (val & PP_TDI) {
 160                                                 data |= JTAGKEY_TDI;
 161                                                 DPRINTF("TDI\n");
 162                                         } else {
 163                                                 DPRINTF("!TDI\n");
 164                                         }
 165                                         if (val & PP_TCK) {
 166                                                 data |= JTAGKEY_TCK;
 167                                                 DPRINTF("TCK\n");
 168                                         } else {
 169                                                 DPRINTF("!TCK\n");
 170                                         }
 171                                         if (val & PP_TMS) {
 172                                                 data |= JTAGKEY_TMS;
 173                                                 DPRINTF("TMS\n");
 174                                         } else {
 175                                                 DPRINTF("!TMS\n");
 176                                         }
 177                                         if (val & PP_CTRL) {
 178                                                 data = JTAGKEY_OEn;
 179                                                 DPRINTF("CTRL\n");
 180                                         } else {
 181                                                 DPRINTF("!CTRL\n");
 182                                         }
 183
 184                                         if (val & PP_PROG) {
 185                                                 DPRINTF("PROG\n");
 186                                         } else {
 187                                                 DPRINTF("!PROG\n");
 188                                         }
 189
 190                                         *writepos = data;
 191
 192                                         last_data = data;
 193                                         last_write = val;
 194                                         break;
 195
 196                                 default:
 197                                         fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
 198                                         ret = -1;
 199                                         break;
 200                         }
 201                 }
 202
 203                 if (nread || (*writepos != prev_data))
 204                         writepos++;
 205         }
 206
 207         if (nread)
 208         {
 209                 DPRINTF("writing %d bytes\n", writepos-writebuf);
 210                 for (i=0; i<writepos-writebuf; i++) {
 211                         ftdi_write_data(&ftdic, writebuf+i, 1);
 212
 213                         if (i > 0 && tr[i].cmdTrans == PP_WRITE && tr[i-1].cmdTrans == PP_READ)
 214                                 ftdi_read_pins(&ftdic, readbuf+i);
 215                 }
 216
 217 #ifdef DEBUG
 218                 DPRINTF("write: ");
 219                 hexdump(writebuf, writepos-writebuf);
 220                 DPRINTF("read: ");
 221                 hexdump(readbuf, i);
 222 #endif
 223
 224                 writepos = writebuf;
 225         } else {
 226                 return ret;
 227         }
 228
 229         readpos = readbuf;
 230
 231         for (i = 0; i < num; i++) {
 232                 DPRINTF("dwPort: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
 233                                 (unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
 234                                 tr[i].fAutoinc, tr[i].dwOptions);
 235
 236                 port = (unsigned long)tr[i].dwPort;
 237                 val = tr[i].Data.Byte;
 238                 readpos++;
 239
 240                 if (port == ppbase + PP_DATA) {
 241                         if (tr[i].cmdTrans == PP_WRITE) {
 242                                 last_write = val;
 243                         }
 244                 } else if (port == ppbase + PP_STATUS) {
 245                         DPRINTF("status port (last write: 0x%x)\n", last_write);
 246                         switch(tr[i].cmdTrans) {
 247                                 case PP_READ:
 248                                         data = *readpos;
 249 #ifdef DEBUG
 250                                         DPRINTF("READ: 0x%x\n", data);
 251                                         jtagkey_state(data);
 252 #endif
 253
 254                                         val = 0x00;
 255                                         if ((data & JTAGKEY_TDO) && (last_write & PP_PROG))
 256                                                 val |= PP_TDO;
 257
 258                                         if (!(last_write & PP_PROG))
 259                                                 val |= 0x08;
 260
 261                                         if (last_write & 0x40)
 262                                                 val |= 0x20;
 263                                         else
 264                                                 val |= 0x80;
 265                                         break;
 266
 267                                 case PP_WRITE:
 268                                         ret = 0; /* Status Port is readonly */
 269                                         break;
 270
 271                                 default:
 272                                         fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
 273                                         ret = -1;
 274                                         break;
 275                         }
 276                 } else {
 277                         ret = 0;
 278                 }
 279
 280                 tr[i].Data.Byte = val;
 281
 282                 DPRINTF("dwPortReturn: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
 283                                 (unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
 284                                 tr[i].fAutoinc, tr[i].dwOptions);
 285 #ifdef DEBUG
 286                 if (tr[i].cmdTrans == 10)
 287                         DPRINTF("read byte: %d\n", tr[i].Data.Byte);
 288 #endif
 289         }
 290
 291         return ret;
 292 }