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[usb-driver] / jtagkey.c
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8121bc50 1#include <stdio.h>
2#include <ftdi.h>
9640dec9 3#include <unistd.h>
8121bc50 4#include "usb-driver.h"
5#include "jtagkey.h"
6
4af4753d 7#define USBBUFSIZE 4096
d0e2002d 8
8121bc50 9static struct ftdi_context ftdic;
4af4753d 10static unsigned int usb_maxlen = 0;
9640dec9 11static unsigned char bitbang_mode;
8121bc50 12
13int jtagkey_init(unsigned short vid, unsigned short pid) {
14 int ret = 0;
d0e2002d 15 unsigned char c;
8121bc50 16
17 if ((ret = ftdi_init(&ftdic)) != 0) {
18 fprintf(stderr, "unable to initialise libftdi: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
19 return ret;
20 }
21
22 if ((ret = ftdi_usb_open(&ftdic, vid, pid)) != 0) {
23 fprintf(stderr, "unable to open ftdi device: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
24 return ret;
25 }
26
27 if ((ret = ftdi_usb_reset(&ftdic)) != 0) {
28 fprintf(stderr, "unable reset device: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
29 return ret;
30 }
31
32 if ((ret = ftdi_set_interface(&ftdic, INTERFACE_A)) != 0) {
33 fprintf(stderr, "unable to set interface: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
34 return ret;
35 }
36
4af4753d 37
38 if ((ret = ftdi_write_data_get_chunksize(&ftdic, &usb_maxlen)) != 0) {
39 fprintf(stderr, "unable to get write chunksize: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
8121bc50 40 return ret;
41 }
42
43 if ((ret = ftdi_set_latency_timer(&ftdic, 1)) != 0) {
44 fprintf(stderr, "unable to set latency timer: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
45 return ret;
46 }
47
d0e2002d 48 if ((ret = ftdi_set_baudrate(&ftdic, 500000)) != 0) {
8121bc50 49 fprintf(stderr, "unable to set baudrate: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
50 return ret;
51 }
52
d0e2002d 53 c = 0x00;
54 ftdi_write_data(&ftdic, &c, 1);
55
4af4753d 56 if ((ret = ftdi_set_bitmode(&ftdic, JTAGKEY_TCK|JTAGKEY_TDI|JTAGKEY_TMS|JTAGKEY_OEn, BITMODE_BITBANG)) != 0) {
8121bc50 57 fprintf(stderr, "unable to enable bitbang mode: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
58 return ret;
59 }
60
9640dec9 61 bitbang_mode = BITMODE_BITBANG;
62
8121bc50 63 if ((ret = ftdi_usb_purge_buffers(&ftdic)) != 0) {
64 fprintf(stderr, "unable to purge buffers: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
65 return ret;
66 }
67
68 return ret;
69}
70
71void jtagkey_close() {
72 ftdi_disable_bitbang(&ftdic);
73 ftdi_usb_close(&ftdic);
74 ftdi_deinit(&ftdic);
75}
76
9640dec9 77static int jtagkey_set_bbmode(unsigned char mode) {
78 int ret = 0;
79
80 if (bitbang_mode != mode) {
81 DPRINTF("switching bitbang-mode!\n");
82 /* Wait for the latency-timer to kick in */
83 usleep(2);
84 if ((ret = ftdi_set_bitmode(&ftdic, JTAGKEY_TCK|JTAGKEY_TDI|JTAGKEY_TMS|JTAGKEY_OEn, mode)) != 0) {
85 fprintf(stderr, "unable to enable bitbang mode: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
86 return ret;
87 }
88 if ((ret = ftdi_usb_purge_buffers(&ftdic)) != 0) {
89 fprintf(stderr, "unable to purge buffers: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
90 return ret;
91 }
92 /* Wait for the FTDI2232 to settle */
93 usleep(2);
94
95 bitbang_mode = mode;
96 }
97
98 return ret;
99}
100
8121bc50 101void jtagkey_state(unsigned char data) {
102 fprintf(stderr,"Pins high: ");
103
104 if (data & JTAGKEY_TCK)
105 fprintf(stderr,"TCK ");
106
107 if (data & JTAGKEY_TDI)
108 fprintf(stderr,"TDI ");
109
110 if (data & JTAGKEY_TDO)
111 fprintf(stderr,"TDO ");
112
113 if (data & JTAGKEY_TMS)
114 fprintf(stderr,"TMS ");
115
116 if (data & JTAGKEY_VREF)
117 fprintf(stderr,"VREF ");
118
119 fprintf(stderr,"\n");
120}
121
122int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase, int ecpbase, int num) {
123 int ret = 0;
124 int i;
d0e2002d 125 int nread = 0;
8121bc50 126 unsigned long port;
127 unsigned char val;
d0e2002d 128 static unsigned char last_data = 0;
e81047b8 129 static unsigned char last_write = 0x00;
d0e2002d 130 static unsigned char writebuf[USBBUFSIZE], *writepos = writebuf;
131 static unsigned char readbuf[USBBUFSIZE], *readpos;
e81047b8 132 unsigned char data, prev_data;
d0e2002d 133
e81047b8 134 /* Count reads */
d0e2002d 135 for (i = 0; i < num; i++)
e81047b8 136 if (tr[i].cmdTrans == PP_READ)
d0e2002d 137 nread++;
138
139 /* Write combining */
140 if ((writepos-writebuf > sizeof(writebuf)-num) || (nread && writepos-writebuf)) {
4af4753d 141 unsigned char *pos = writebuf;
142 int len;
d0e2002d 143 DPRINTF("writing %d bytes due to %d following reads in %d chunks or full buffer\n", writepos-writebuf, nread, num);
144
9640dec9 145 jtagkey_set_bbmode(BITMODE_BITBANG);
4af4753d 146 while (pos < writepos) {
85690a3f 147 len = writepos-pos;
148
4af4753d 149 if (len > usb_maxlen)
150 len = usb_maxlen;
d0e2002d 151
4af4753d 152 DPRINTF("combined write of %d/%d\n",len,writepos-pos);
153 ftdi_write_data(&ftdic, pos, len);
154 pos += len;
e81047b8 155 }
4af4753d 156
d0e2002d 157 DPRINTF("read %d/%d bytes\n", i, writepos-writebuf);
158 writepos = writebuf;
159 }
8121bc50 160
161 for (i = 0; i < num; i++) {
162 DPRINTF("dwPort: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
163 (unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
164 tr[i].fAutoinc, tr[i].dwOptions);
165
166 port = (unsigned long)tr[i].dwPort;
167 val = tr[i].Data.Byte;
168
169#ifdef DEBUG
170 if (tr[i].cmdTrans == 13)
171 DPRINTF("write byte: %d\n", val);
172#endif
173
b122ac4b 174 /* Pad writebuf for read-commands in stream */
d0e2002d 175 *writepos = last_data;
e81047b8 176 prev_data = last_data;
b122ac4b 177
8121bc50 178 if (port == ppbase + PP_DATA) {
179 DPRINTF("data port\n");
180
181 data = 0x00;
182 switch(tr[i].cmdTrans) {
183 case PP_READ:
184 ret = 0; /* We don't support reading of the data port */
185 break;
186
187 case PP_WRITE:
188 if (val & PP_TDI) {
189 data |= JTAGKEY_TDI;
190 DPRINTF("TDI\n");
191 } else {
192 DPRINTF("!TDI\n");
193 }
194 if (val & PP_TCK) {
195 data |= JTAGKEY_TCK;
196 DPRINTF("TCK\n");
197 } else {
198 DPRINTF("!TCK\n");
199 }
200 if (val & PP_TMS) {
201 data |= JTAGKEY_TMS;
202 DPRINTF("TMS\n");
203 } else {
204 DPRINTF("!TMS\n");
205 }
206 if (val & PP_CTRL) {
d0e2002d 207 data = JTAGKEY_OEn;
8121bc50 208 DPRINTF("CTRL\n");
209 } else {
210 DPRINTF("!CTRL\n");
211 }
8121bc50 212
d0e2002d 213 if (val & PP_PROG) {
214 DPRINTF("PROG\n");
215 } else {
216 DPRINTF("!PROG\n");
217 }
218
219 *writepos = data;
220
b122ac4b 221 last_data = data;
d0e2002d 222 last_write = val;
8121bc50 223 break;
224
225 default:
226 fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
227 ret = -1;
228 break;
229 }
b122ac4b 230 }
e81047b8 231
232 if (nread || (*writepos != prev_data))
233 writepos++;
b122ac4b 234 }
235
d0e2002d 236 if (nread)
237 {
238 DPRINTF("writing %d bytes\n", writepos-writebuf);
9640dec9 239 jtagkey_set_bbmode(BITMODE_SYNCBB);
240 ftdi_write_data(&ftdic, writebuf, writepos-writebuf);
3f5287b7 241
9640dec9 242 i = 0;
243 while (i < writepos-writebuf) {
244 i += ftdi_read_data(&ftdic, readbuf, sizeof(readbuf));
d0e2002d 245 }
b122ac4b 246
247#ifdef DEBUG
d0e2002d 248 DPRINTF("write: ");
249 hexdump(writebuf, writepos-writebuf);
250 DPRINTF("read: ");
251 hexdump(readbuf, i);
b122ac4b 252#endif
253
d0e2002d 254 writepos = writebuf;
255 } else {
256 return ret;
257 }
258
259 readpos = readbuf;
b122ac4b 260
261 for (i = 0; i < num; i++) {
262 DPRINTF("dwPort: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
263 (unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
264 tr[i].fAutoinc, tr[i].dwOptions);
265
266 port = (unsigned long)tr[i].dwPort;
267 val = tr[i].Data.Byte;
d0e2002d 268 readpos++;
b122ac4b 269
d0e2002d 270 if (port == ppbase + PP_DATA) {
271 if (tr[i].cmdTrans == PP_WRITE) {
272 last_write = val;
273 }
274 } else if (port == ppbase + PP_STATUS) {
275 DPRINTF("status port (last write: 0x%x)\n", last_write);
8121bc50 276 switch(tr[i].cmdTrans) {
277 case PP_READ:
d0e2002d 278 data = *readpos;
8121bc50 279#ifdef DEBUG
280 DPRINTF("READ: 0x%x\n", data);
281 jtagkey_state(data);
282#endif
283
284 val = 0x00;
d0e2002d 285 if ((data & JTAGKEY_TDO) && (last_write & PP_PROG))
8121bc50 286 val |= PP_TDO;
287
d0e2002d 288 if (!(last_write & PP_PROG))
289 val |= 0x08;
290
8121bc50 291 if (last_write & 0x40)
292 val |= 0x20;
293 else
294 val |= 0x80;
295 break;
296
297 case PP_WRITE:
298 ret = 0; /* Status Port is readonly */
299 break;
300
301 default:
302 fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
303 ret = -1;
304 break;
305 }
8121bc50 306 } else {
8121bc50 307 ret = 0;
308 }
309
310 tr[i].Data.Byte = val;
311
312 DPRINTF("dwPortReturn: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
313 (unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
314 tr[i].fAutoinc, tr[i].dwOptions);
315#ifdef DEBUG
316 if (tr[i].cmdTrans == 10)
317 DPRINTF("read byte: %d\n", tr[i].Data.Byte);
318#endif
319 }
320
321 return ret;
322}
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