increase programming speed by a factor of 4.
[usb-driver] / 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 len = writepos-pos;
118
119 while (pos < writepos) {
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 ftdi_read_pins(&ftdic, readbuf+i);
213 }
214
215 #ifdef DEBUG
216 DPRINTF("write: ");
217 hexdump(writebuf, writepos-writebuf);
218 DPRINTF("read: ");
219 hexdump(readbuf, i);
220 #endif
221
222 writepos = writebuf;
223 } else {
224 return ret;
225 }
226
227 readpos = readbuf;
228 readpos += 0;
229
230 for (i = 0; i < num; i++) {
231 DPRINTF("dwPort: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
232 (unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
233 tr[i].fAutoinc, tr[i].dwOptions);
234
235 port = (unsigned long)tr[i].dwPort;
236 val = tr[i].Data.Byte;
237 readpos++;
238
239 if (port == ppbase + PP_DATA) {
240 if (tr[i].cmdTrans == PP_WRITE) {
241 last_write = val;
242 }
243 } else if (port == ppbase + PP_STATUS) {
244 DPRINTF("status port (last write: 0x%x)\n", last_write);
245 switch(tr[i].cmdTrans) {
246 case PP_READ:
247 data = *readpos;
248 #ifdef DEBUG
249 DPRINTF("READ: 0x%x\n", data);
250 jtagkey_state(data);
251 #endif
252
253 val = 0x00;
254 if ((data & JTAGKEY_TDO) && (last_write & PP_PROG))
255 val |= PP_TDO;
256
257 if (!(last_write & PP_PROG))
258 val |= 0x08;
259
260 if (last_write & 0x40)
261 val |= 0x20;
262 else
263 val |= 0x80;
264 break;
265
266 case PP_WRITE:
267 ret = 0; /* Status Port is readonly */
268 break;
269
270 default:
271 fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
272 ret = -1;
273 break;
274 }
275 } else {
276 ret = 0;
277 }
278
279 tr[i].Data.Byte = val;
280
281 DPRINTF("dwPortReturn: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
282 (unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
283 tr[i].fAutoinc, tr[i].dwOptions);
284 #ifdef DEBUG
285 if (tr[i].cmdTrans == 10)
286 DPRINTF("read byte: %d\n", tr[i].Data.Byte);
287 #endif
288 }
289
290 return ret;
291 }
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