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[usb-driver] / jtagkey.c
1 #include <stdio.h>
2 #include <ftdi.h>
3 #include <unistd.h>
4 #include "usb-driver.h"
5 #include "jtagkey.h"
6
7 #define USBBUFSIZE 4096
8
9 static struct ftdi_context ftdic;
10 static unsigned int usb_maxlen = 0;
11 static unsigned char bitbang_mode;
12
13 int jtagkey_init(unsigned short vid, unsigned short pid) {
14 int ret = 0;
15 unsigned char c;
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
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));
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
48 if ((ret = ftdi_set_baudrate(&ftdic, 500000)) != 0) {
49 fprintf(stderr, "unable to set baudrate: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
50 return ret;
51 }
52
53 c = 0x00;
54 ftdi_write_data(&ftdic, &c, 1);
55
56 if ((ret = ftdi_set_bitmode(&ftdic, JTAGKEY_TCK|JTAGKEY_TDI|JTAGKEY_TMS|JTAGKEY_OEn, BITMODE_BITBANG)) != 0) {
57 fprintf(stderr, "unable to enable bitbang mode: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
58 return ret;
59 }
60
61 bitbang_mode = BITMODE_BITBANG;
62
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
71 void jtagkey_close() {
72 ftdi_disable_bitbang(&ftdic);
73 ftdi_usb_close(&ftdic);
74 ftdi_deinit(&ftdic);
75 }
76
77 static int jtagkey_set_bbmode(unsigned char mode) {
78 int ret = 0;
79
80 if (bitbang_mode != mode) {
81 DPRINTF("switching bitbang-mode!\n");
82
83 /* Wait for the latency-timer to kick in */
84 usleep(2);
85 if ((ret = ftdi_set_bitmode(&ftdic, JTAGKEY_TCK|JTAGKEY_TDI|JTAGKEY_TMS|JTAGKEY_OEn, mode)) != 0) {
86 fprintf(stderr, "unable to enable bitbang mode: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
87 return ret;
88 }
89 if ((ret = ftdi_usb_purge_buffers(&ftdic)) != 0) {
90 fprintf(stderr, "unable to purge buffers: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
91 return ret;
92 }
93 /* Wait for the FTDI2232 to settle */
94 usleep(2);
95
96 bitbang_mode = mode;
97 }
98
99 return ret;
100 }
101
102 void jtagkey_state(unsigned char data) {
103 fprintf(stderr,"Pins high: ");
104
105 if (data & JTAGKEY_TCK)
106 fprintf(stderr,"TCK ");
107
108 if (data & JTAGKEY_TDI)
109 fprintf(stderr,"TDI ");
110
111 if (data & JTAGKEY_TDO)
112 fprintf(stderr,"TDO ");
113
114 if (data & JTAGKEY_TMS)
115 fprintf(stderr,"TMS ");
116
117 if (data & JTAGKEY_VREF)
118 fprintf(stderr,"VREF ");
119
120 fprintf(stderr,"\n");
121 }
122
123 int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase, int ecpbase, int num) {
124 int ret = 0;
125 int i;
126 int nread = 0;
127 unsigned long port;
128 unsigned char val;
129 static unsigned char last_data = 0;
130 static unsigned char last_write = 0x00;
131 static unsigned char writebuf[USBBUFSIZE], *writepos = writebuf;
132 static unsigned char readbuf[USBBUFSIZE], *readpos;
133 unsigned char data, prev_data;
134
135 /* Count reads */
136 for (i = 0; i < num; i++)
137 if (tr[i].cmdTrans == PP_READ)
138 nread++;
139
140 /* Write combining */
141 if ((writepos-writebuf > sizeof(writebuf)-num) || (nread && writepos-writebuf)) {
142 unsigned char *pos = writebuf;
143 int len;
144 DPRINTF("writing %d bytes due to %d following reads in %d chunks or full buffer\n", writepos-writebuf, nread, num);
145
146 jtagkey_set_bbmode(BITMODE_BITBANG);
147 while (pos < writepos) {
148 len = writepos-pos;
149
150 if (len > usb_maxlen)
151 len = usb_maxlen;
152
153 DPRINTF("combined write of %d/%d\n",len,writepos-pos);
154 ftdi_write_data(&ftdic, pos, len);
155 pos += len;
156 }
157
158 DPRINTF("read %d/%d bytes\n", i, writepos-writebuf);
159 writepos = writebuf;
160 }
161
162 for (i = 0; i < num; i++) {
163 DPRINTF("dwPort: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
164 (unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
165 tr[i].fAutoinc, tr[i].dwOptions);
166
167 port = (unsigned long)tr[i].dwPort;
168 val = tr[i].Data.Byte;
169
170 #ifdef DEBUG
171 if (tr[i].cmdTrans == 13)
172 DPRINTF("write byte: %d\n", val);
173 #endif
174
175 /* Pad writebuf for read-commands in stream */
176 *writepos = last_data;
177 prev_data = last_data;
178
179 if (port == ppbase + PP_DATA) {
180 DPRINTF("data port\n");
181
182 data = 0x00;
183 switch(tr[i].cmdTrans) {
184 case PP_READ:
185 ret = 0; /* We don't support reading of the data port */
186 break;
187
188 case PP_WRITE:
189 if (val & PP_TDI) {
190 data |= JTAGKEY_TDI;
191 DPRINTF("TDI\n");
192 } else {
193 DPRINTF("!TDI\n");
194 }
195 if (val & PP_TCK) {
196 data |= JTAGKEY_TCK;
197 DPRINTF("TCK\n");
198 } else {
199 DPRINTF("!TCK\n");
200 }
201 if (val & PP_TMS) {
202 data |= JTAGKEY_TMS;
203 DPRINTF("TMS\n");
204 } else {
205 DPRINTF("!TMS\n");
206 }
207 if (val & PP_CTRL) {
208 data = JTAGKEY_OEn;
209 DPRINTF("CTRL\n");
210 } else {
211 DPRINTF("!CTRL\n");
212 }
213
214 if (val & PP_PROG) {
215 DPRINTF("PROG\n");
216 } else {
217 DPRINTF("!PROG\n");
218 }
219
220 *writepos = data;
221
222 last_data = data;
223 last_write = val;
224 break;
225
226 default:
227 fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
228 ret = -1;
229 break;
230 }
231 }
232
233 if (nread || (*writepos != prev_data))
234 writepos++;
235 }
236
237 if (nread)
238 {
239 DPRINTF("writing %d bytes\n", writepos-writebuf);
240
241 *writepos = last_data;
242 writepos++;
243
244 jtagkey_set_bbmode(BITMODE_SYNCBB);
245 ftdi_write_data(&ftdic, writebuf, writepos-writebuf);
246
247 i = 0;
248 while (i < writepos-writebuf) {
249 i += ftdi_read_data(&ftdic, readbuf, sizeof(readbuf));
250 }
251
252 #ifdef DEBUG
253 DPRINTF("write: ");
254 hexdump(writebuf, writepos-writebuf);
255 DPRINTF("read: ");
256 hexdump(readbuf, i);
257 #endif
258
259 writepos = writebuf;
260 } else {
261 return ret;
262 }
263
264 readpos = readbuf;
265
266 for (i = 0; i < num; i++) {
267 DPRINTF("dwPort: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
268 (unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
269 tr[i].fAutoinc, tr[i].dwOptions);
270
271 port = (unsigned long)tr[i].dwPort;
272 val = tr[i].Data.Byte;
273 readpos++;
274
275 if (port == ppbase + PP_DATA) {
276 if (tr[i].cmdTrans == PP_WRITE) {
277 last_write = val;
278 }
279 } else if (port == ppbase + PP_STATUS) {
280 DPRINTF("status port (last write: 0x%x)\n", last_write);
281 switch(tr[i].cmdTrans) {
282 case PP_READ:
283 data = *readpos;
284
285 #ifdef DEBUG
286 DPRINTF("READ: 0x%x\n", data);
287 jtagkey_state(data);
288 #endif
289
290 val = 0x00;
291 if ((data & JTAGKEY_TDO) && (last_write & PP_PROG))
292 val |= PP_TDO;
293
294 if (!(last_write & PP_PROG))
295 val |= 0x08;
296
297 if (last_write & 0x40)
298 val |= 0x20;
299 else
300 val |= 0x80;
301 break;
302
303 case PP_WRITE:
304 ret = 0; /* Status Port is readonly */
305 break;
306
307 default:
308 fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
309 ret = -1;
310 break;
311 }
312 } else {
313 ret = 0;
314 }
315
316 tr[i].Data.Byte = val;
317
318 DPRINTF("dwPortReturn: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
319 (unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
320 tr[i].fAutoinc, tr[i].dwOptions);
321 #ifdef DEBUG
322 if (tr[i].cmdTrans == 10)
323 DPRINTF("read byte: %d\n", tr[i].Data.Byte);
324 #endif
325 }
326
327 return ret;
328 }
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