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[openocd.git] / src / target / mips32_dmaacc.c
blob9a38084106ed1a53b5e8c4ad2940e67a0cd8c975
1 /***************************************************************************
2 * Copyright (C) 2008 by John McCarthy *
3 * jgmcc@magma.ca *
4 * *
5 * Copyright (C) 2008 by Spencer Oliver *
6 * spen@spen-soft.co.uk *
7 * *
8 * Copyright (C) 2008 by David T.L. Wong *
9 * *
10 * This program is free software; you can redistribute it and/or modify *
11 * it under the terms of the GNU General Public License as published by *
12 * the Free Software Foundation; either version 2 of the License, or *
13 * (at your option) any later version. *
14 * *
15 * This program is distributed in the hope that it will be useful, *
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
18 * GNU General Public License for more details. *
19 * *
20 * You should have received a copy of the GNU General Public License *
21 * along with this program; if not, write to the *
22 * Free Software Foundation, Inc., *
23 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
24 ***************************************************************************/
25 #ifdef HAVE_CONFIG_H
26 #include "config.h"
27 #endif
28
29 #include "mips32_dmaacc.h"
30
31
32 /*
33 * The following logic shamelessly cloned from HairyDairyMaid's wrt54g_debrick
34 * to support the Broadcom BCM5352 SoC in the Linksys WRT54GL wireless router
35 * (and any others that support EJTAG DMA transfers).
36 * Note: This only supports memory read/write. Since the BCM5352 doesn't
37 * appear to support PRACC accesses, all debug functions except halt
38 * do not work. Still, this does allow erasing/writing flash as well as
39 * displaying/modifying memory and memory mapped registers.
40 */
41
42 static int ejtag_dma_read(mips_ejtag_t *ejtag_info, uint32_t addr, uint32_t *data)
43 {
44 uint32_t v;
45 uint32_t ejtag_ctrl;
46 int retries = RETRY_ATTEMPTS;
47
48 begin_ejtag_dma_read:
49
50 /* Setup Address */
51 v = addr;
52 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS, NULL);
53 mips_ejtag_drscan_32(ejtag_info, &v);
54
55 /* Initiate DMA Read & set DSTRT */
56 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
57 ejtag_ctrl = EJTAG_CTRL_DMAACC | EJTAG_CTRL_DRWN | EJTAG_CTRL_DMA_WORD | EJTAG_CTRL_DSTRT | ejtag_info->ejtag_ctrl;
58 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
59
60 /* Wait for DSTRT to Clear */
61 do {
62 ejtag_ctrl = EJTAG_CTRL_DMAACC | ejtag_info->ejtag_ctrl;
63 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
64 } while (ejtag_ctrl & EJTAG_CTRL_DSTRT);
65
66 /* Read Data */
67 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_DATA, NULL);
68 mips_ejtag_drscan_32(ejtag_info, data);
69
70 /* Clear DMA & Check DERR */
71 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
72 ejtag_ctrl = ejtag_info->ejtag_ctrl;
73 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
74 if (ejtag_ctrl & EJTAG_CTRL_DERR)
75 {
76 if (retries--) {
77 LOG_ERROR("DMA Read Addr = %08" PRIx32 " Data = ERROR ON READ (retrying)\n", addr);
78 goto begin_ejtag_dma_read;
79 }
80 else
81 LOG_ERROR("DMA Read Addr = %08" PRIx32 " Data = ERROR ON READ\n", addr);
82 return ERROR_JTAG_DEVICE_ERROR;
83 }
84
85 return ERROR_OK;
86 }
87
88 static int ejtag_dma_read_h(mips_ejtag_t *ejtag_info, uint32_t addr, uint16_t *data)
89 {
90 uint32_t v;
91 uint32_t ejtag_ctrl;
92 int retries = RETRY_ATTEMPTS;
93
94 begin_ejtag_dma_read_h:
95
96 /* Setup Address */
97 v = addr;
98 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS, NULL);
99 mips_ejtag_drscan_32(ejtag_info, &v);
100
101 /* Initiate DMA Read & set DSTRT */
102 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
103 ejtag_ctrl = EJTAG_CTRL_DMAACC | EJTAG_CTRL_DRWN | EJTAG_CTRL_DMA_HALFWORD | EJTAG_CTRL_DSTRT | ejtag_info->ejtag_ctrl;
104 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
105
106 /* Wait for DSTRT to Clear */
107 do {
108 ejtag_ctrl = EJTAG_CTRL_DMAACC | ejtag_info->ejtag_ctrl;
109 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
110 } while (ejtag_ctrl & EJTAG_CTRL_DSTRT);
111
112 /* Read Data */
113 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_DATA, NULL);
114 mips_ejtag_drscan_32(ejtag_info, &v);
115
116 /* Clear DMA & Check DERR */
117 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
118 ejtag_ctrl = ejtag_info->ejtag_ctrl;
119 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
120 if (ejtag_ctrl & EJTAG_CTRL_DERR)
121 {
122 if (retries--) {
123 LOG_ERROR("DMA Read Addr = %08" PRIx32 " Data = ERROR ON READ (retrying)\n", addr);
124 goto begin_ejtag_dma_read_h;
125 }
126 else
127 LOG_ERROR("DMA Read Addr = %08" PRIx32 " Data = ERROR ON READ\n", addr);
128 return ERROR_JTAG_DEVICE_ERROR;
129 }
130
131 /* Handle the bigendian/littleendian */
132 if (addr & 0x2)
133 *data = (v >> 16) & 0xffff;
134 else
135 *data = (v & 0x0000ffff);
136
137 return ERROR_OK;
138 }
139
140 static int ejtag_dma_read_b(mips_ejtag_t *ejtag_info, uint32_t addr, uint8_t *data)
141 {
142 uint32_t v;
143 uint32_t ejtag_ctrl;
144 int retries = RETRY_ATTEMPTS;
145
146 begin_ejtag_dma_read_b:
147
148 /* Setup Address */
149 v = addr;
150 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS, NULL);
151 mips_ejtag_drscan_32(ejtag_info, &v);
152
153 /* Initiate DMA Read & set DSTRT */
154 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
155 ejtag_ctrl = EJTAG_CTRL_DMAACC | EJTAG_CTRL_DRWN | EJTAG_CTRL_DMA_BYTE | EJTAG_CTRL_DSTRT | ejtag_info->ejtag_ctrl;
156 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
157
158 /* Wait for DSTRT to Clear */
159 do {
160 ejtag_ctrl = EJTAG_CTRL_DMAACC | ejtag_info->ejtag_ctrl;
161 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
162 } while (ejtag_ctrl & EJTAG_CTRL_DSTRT);
163
164 /* Read Data */
165 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_DATA, NULL);
166 mips_ejtag_drscan_32(ejtag_info, &v);
167
168 /* Clear DMA & Check DERR */
169 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
170 ejtag_ctrl = ejtag_info->ejtag_ctrl;
171 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
172 if (ejtag_ctrl & EJTAG_CTRL_DERR)
173 {
174 if (retries--) {
175 LOG_ERROR("DMA Read Addr = %08" PRIx32 " Data = ERROR ON READ (retrying)\n", addr);
176 goto begin_ejtag_dma_read_b;
177 }
178 else
179 LOG_ERROR("DMA Read Addr = %08" PRIx32 " Data = ERROR ON READ\n", addr);
180 return ERROR_JTAG_DEVICE_ERROR;
181 }
182
183 /* Handle the bigendian/littleendian */
184 switch (addr & 0x3) {
185 case 0:
186 *data = v & 0xff;
187 break;
188 case 1:
189 *data = (v >> 8) & 0xff;
190 break;
191 case 2:
192 *data = (v >> 16) & 0xff;
193 break;
194 case 3:
195 *data = (v >> 24) & 0xff;
196 break;
197 }
198
199 return ERROR_OK;
200 }
201
202 static int ejtag_dma_write(mips_ejtag_t *ejtag_info, uint32_t addr, uint32_t data)
203 {
204 uint32_t v;
205 uint32_t ejtag_ctrl;
206 int retries = RETRY_ATTEMPTS;
207
208 begin_ejtag_dma_write:
209
210 /* Setup Address */
211 v = addr;
212 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS, NULL);
213 mips_ejtag_drscan_32(ejtag_info, &v);
214
215 /* Setup Data */
216 v = data;
217 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_DATA, NULL);
218 mips_ejtag_drscan_32(ejtag_info, &v);
219
220 /* Initiate DMA Write & set DSTRT */
221 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
222 ejtag_ctrl = EJTAG_CTRL_DMAACC | EJTAG_CTRL_DMA_WORD | EJTAG_CTRL_DSTRT | ejtag_info->ejtag_ctrl;
223 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
224
225 /* Wait for DSTRT to Clear */
226 do {
227 ejtag_ctrl = EJTAG_CTRL_DMAACC | ejtag_info->ejtag_ctrl;
228 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
229 } while (ejtag_ctrl & EJTAG_CTRL_DSTRT);
230
231 /* Clear DMA & Check DERR */
232 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
233 ejtag_ctrl = ejtag_info->ejtag_ctrl;
234 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
235 if (ejtag_ctrl & EJTAG_CTRL_DERR)
236 {
237 if (retries--) {
238 LOG_ERROR("DMA Write Addr = %08" PRIx32 " Data = ERROR ON WRITE (retrying)\n", addr);
239 goto begin_ejtag_dma_write;
240 }
241 else
242 LOG_ERROR("DMA Write Addr = %08" PRIx32 " Data = ERROR ON WRITE\n", addr);
243 return ERROR_JTAG_DEVICE_ERROR;
244 }
245
246 return ERROR_OK;
247 }
248
249 static int ejtag_dma_write_h(mips_ejtag_t *ejtag_info, uint32_t addr, uint32_t data)
250 {
251 uint32_t v;
252 uint32_t ejtag_ctrl;
253 int retries = RETRY_ATTEMPTS;
254
255 /* Handle the bigendian/littleendian */
256 data &= 0xffff;
257 data |= data << 16;
258
259 begin_ejtag_dma_write_h:
260
261 /* Setup Address */
262 v = addr;
263 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS, NULL);
264 mips_ejtag_drscan_32(ejtag_info, &v);
265
266 /* Setup Data */
267 v = data;
268 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_DATA, NULL);
269 mips_ejtag_drscan_32(ejtag_info, &v);
270
271 /* Initiate DMA Write & set DSTRT */
272 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
273 ejtag_ctrl = EJTAG_CTRL_DMAACC | EJTAG_CTRL_DMA_HALFWORD | EJTAG_CTRL_DSTRT | ejtag_info->ejtag_ctrl;
274 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
275
276 /* Wait for DSTRT to Clear */
277 do {
278 ejtag_ctrl = EJTAG_CTRL_DMAACC | ejtag_info->ejtag_ctrl;
279 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
280 } while (ejtag_ctrl & EJTAG_CTRL_DSTRT);
281
282 /* Clear DMA & Check DERR */
283 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
284 ejtag_ctrl = ejtag_info->ejtag_ctrl;
285 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
286 if (ejtag_ctrl & EJTAG_CTRL_DERR)
287 {
288 if (retries--) {
289 LOG_ERROR("DMA Write Addr = %08" PRIx32 " Data = ERROR ON WRITE (retrying)\n", addr);
290 goto begin_ejtag_dma_write_h;
291 }
292 else
293 LOG_ERROR("DMA Write Addr = %08" PRIx32 " Data = ERROR ON WRITE\n", addr);
294 return ERROR_JTAG_DEVICE_ERROR;
295 }
296
297 return ERROR_OK;
298 }
299
300 static int ejtag_dma_write_b(mips_ejtag_t *ejtag_info, uint32_t addr, uint32_t data)
301 {
302 uint32_t v;
303 uint32_t ejtag_ctrl;
304 int retries = RETRY_ATTEMPTS;
305
306 /* Handle the bigendian/littleendian */
307 data &= 0xff;
308 data |= data << 8;
309 data |= data << 16;
310
311 begin_ejtag_dma_write_b:
312
313 /* Setup Address*/
314 v = addr;
315 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS, NULL);
316 mips_ejtag_drscan_32(ejtag_info, &v);
317
318 /* Setup Data */
319 v = data;
320 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_DATA, NULL);
321 mips_ejtag_drscan_32(ejtag_info, &v);
322
323 /* Initiate DMA Write & set DSTRT */
324 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
325 ejtag_ctrl = EJTAG_CTRL_DMAACC | EJTAG_CTRL_DMA_BYTE | EJTAG_CTRL_DSTRT | ejtag_info->ejtag_ctrl;
326 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
327
328 /* Wait for DSTRT to Clear */
329 do {
330 ejtag_ctrl = EJTAG_CTRL_DMAACC | ejtag_info->ejtag_ctrl;
331 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
332 } while (ejtag_ctrl & EJTAG_CTRL_DSTRT);
333
334 /* Clear DMA & Check DERR */
335 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
336 ejtag_ctrl = ejtag_info->ejtag_ctrl;
337 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
338 if (ejtag_ctrl & EJTAG_CTRL_DERR)
339 {
340 if (retries--) {
341 LOG_ERROR("DMA Write Addr = %08" PRIx32 " Data = ERROR ON WRITE (retrying)\n", addr);
342 goto begin_ejtag_dma_write_b;
343 }
344 else
345 LOG_ERROR("DMA Write Addr = %08" PRIx32 " Data = ERROR ON WRITE\n", addr);
346 return ERROR_JTAG_DEVICE_ERROR;
347 }
348
349 return ERROR_OK;
350 }
351
352 int mips32_dmaacc_read_mem(mips_ejtag_t *ejtag_info, uint32_t addr, int size, int count, void *buf)
353 {
354 switch (size)
355 {
356 case 1:
357 return mips32_dmaacc_read_mem8(ejtag_info, addr, count, (uint8_t*)buf);
358 case 2:
359 return mips32_dmaacc_read_mem16(ejtag_info, addr, count, (uint16_t*)buf);
360 case 4:
361 return mips32_dmaacc_read_mem32(ejtag_info, addr, count, (uint32_t*)buf);
362 }
363
364 return ERROR_OK;
365 }
366
367 int mips32_dmaacc_read_mem32(mips_ejtag_t *ejtag_info, uint32_t addr, int count, uint32_t *buf)
368 {
369 int i;
370 int retval;
371
372 for (i = 0; i < count; i++) {
373 if ((retval = ejtag_dma_read(ejtag_info, addr + i*sizeof(*buf), &buf[i])) != ERROR_OK)
374 return retval;
375 }
376
377 return ERROR_OK;
378 }
379
380 int mips32_dmaacc_read_mem16(mips_ejtag_t *ejtag_info, uint32_t addr, int count, uint16_t *buf)
381 {
382 int i;
383 int retval;
384
385 for (i = 0; i < count; i++) {
386 if ((retval = ejtag_dma_read_h(ejtag_info, addr + i*sizeof(*buf), &buf[i])) != ERROR_OK)
387 return retval;
388 }
389
390 return ERROR_OK;
391 }
392
393 int mips32_dmaacc_read_mem8(mips_ejtag_t *ejtag_info, uint32_t addr, int count, uint8_t *buf)
394 {
395 int i;
396 int retval;
397
398 for (i = 0; i < count; i++) {
399 if ((retval = ejtag_dma_read_b(ejtag_info, addr + i*sizeof(*buf), &buf[i])) != ERROR_OK)
400 return retval;
401 }
402
403 return ERROR_OK;
404 }
405
406 int mips32_dmaacc_write_mem(mips_ejtag_t *ejtag_info, uint32_t addr, int size, int count, void *buf)
407 {
408 switch (size)
409 {
410 case 1:
411 return mips32_dmaacc_write_mem8(ejtag_info, addr, count, (uint8_t*)buf);
412 case 2:
413 return mips32_dmaacc_write_mem16(ejtag_info, addr, count,(uint16_t*)buf);
414 case 4:
415 return mips32_dmaacc_write_mem32(ejtag_info, addr, count, (uint32_t*)buf);
416 }
417
418 return ERROR_OK;
419 }
420
421 int mips32_dmaacc_write_mem32(mips_ejtag_t *ejtag_info, uint32_t addr, int count, uint32_t *buf)
422 {
423 int i;
424 int retval;
425
426 for (i = 0; i < count; i++) {
427 if ((retval = ejtag_dma_write(ejtag_info, addr + i*sizeof(*buf), buf[i])) != ERROR_OK)
428 return retval;
429 }
430
431 return ERROR_OK;
432 }
433
434 int mips32_dmaacc_write_mem16(mips_ejtag_t *ejtag_info, uint32_t addr, int count, uint16_t *buf)
435 {
436 int i;
437 int retval;
438
439 for (i = 0; i < count; i++) {
440 if ((retval = ejtag_dma_write_h(ejtag_info, addr + i*sizeof(*buf), buf[i])) != ERROR_OK)
441 return retval;
442 }
443
444 return ERROR_OK;
445 }
446
447 int mips32_dmaacc_write_mem8(mips_ejtag_t *ejtag_info, uint32_t addr, int count, uint8_t *buf)
448 {
449 int i;
450 int retval;
451
452 for (i = 0; i < count; i++) {
453 if ((retval = ejtag_dma_write_b(ejtag_info, addr + i*sizeof(*buf), buf[i])) != ERROR_OK)
454 return retval;
455 }
456
457 return ERROR_OK;
458 }
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