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flash: change stm32lx driver probe behaviour
[openocd.git] / src / flash / nor / stm32lx.c
1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
4 * *
5 * Copyright (C) 2008 by Spencer Oliver *
6 * spen@spen-soft.co.uk *
7 * *
8 * Copyright (C) 2011 by Clement Burin des Roziers *
9 * clement.burin-des-roziers@hikob.com *
10 * *
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU General Public License as published by *
13 * the Free Software Foundation; either version 2 of the License, or *
14 * (at your option) any later version. *
15 * *
16 * This program is distributed in the hope that it will be useful, *
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
19 * GNU General Public License for more details. *
20 * *
21 * You should have received a copy of the GNU General Public License *
22 * along with this program; if not, write to the *
23 * Free Software Foundation, Inc., *
24 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
25 ***************************************************************************/
26
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #include "imp.h"
32 #include <helper/binarybuffer.h>
33 #include <target/algorithm.h>
34 #include <target/armv7m.h>
35
36 /* stm32lx flash register locations */
37
38 #define FLASH_BASE 0x40023C00
39 #define FLASH_ACR 0x40023C00
40 #define FLASH_PECR 0x40023C04
41 #define FLASH_PDKEYR 0x40023C08
42 #define FLASH_PEKEYR 0x40023C0C
43 #define FLASH_PRGKEYR 0x40023C10
44 #define FLASH_OPTKEYR 0x40023C14
45 #define FLASH_SR 0x40023C18
46 #define FLASH_OBR 0x40023C1C
47 #define FLASH_WRPR 0x40023C20
48
49 /* FLASH_ACR bites */
50 #define FLASH_ACR__LATENCY (1<<0)
51 #define FLASH_ACR__PRFTEN (1<<1)
52 #define FLASH_ACR__ACC64 (1<<2)
53 #define FLASH_ACR__SLEEP_PD (1<<3)
54 #define FLASH_ACR__RUN_PD (1<<4)
55
56 /* FLASH_PECR bits */
57 #define FLASH_PECR__PELOCK (1<<0)
58 #define FLASH_PECR__PRGLOCK (1<<1)
59 #define FLASH_PECR__OPTLOCK (1<<2)
60 #define FLASH_PECR__PROG (1<<3)
61 #define FLASH_PECR__DATA (1<<4)
62 #define FLASH_PECR__FTDW (1<<8)
63 #define FLASH_PECR__ERASE (1<<9)
64 #define FLASH_PECR__FPRG (1<<10)
65 #define FLASH_PECR__EOPIE (1<<16)
66 #define FLASH_PECR__ERRIE (1<<17)
67 #define FLASH_PECR__OBL_LAUNCH (1<<18)
68
69 /* FLASH_SR bits */
70 #define FLASH_SR__BSY (1<<0)
71 #define FLASH_SR__EOP (1<<1)
72 #define FLASH_SR__ENDHV (1<<2)
73 #define FLASH_SR__READY (1<<3)
74 #define FLASH_SR__WRPERR (1<<8)
75 #define FLASH_SR__PGAERR (1<<9)
76 #define FLASH_SR__SIZERR (1<<10)
77 #define FLASH_SR__OPTVERR (1<<11)
78
79 /* Unlock keys */
80 #define PEKEY1 0x89ABCDEF
81 #define PEKEY2 0x02030405
82 #define PRGKEY1 0x8C9DAEBF
83 #define PRGKEY2 0x13141516
84 #define OPTKEY1 0xFBEAD9C8
85 #define OPTKEY2 0x24252627
86
87 /* other registers */
88 #define DBGMCU_IDCODE 0xE0042000
89 #define F_SIZE 0x1FF8004C
90
91 /* Constants */
92 #define FLASH_PAGE_SIZE 256
93 #define FLASH_SECTOR_SIZE 4096
94 #define FLASH_PAGES_PER_SECTOR 16
95 #define FLASH_BANK0_ADDRESS 0x08000000
96
97 /* stm32lx option byte register location */
98 #define OB_RDP 0x1FF80000
99 #define OB_USER 0x1FF80004
100 #define OB_WRP0_1 0x1FF80008
101 #define OB_WRP2_3 0x1FF8000C
102
103 /* OB_RDP values */
104 #define OB_RDP__LEVEL0 0xFF5500AA
105 #define OB_RDP__LEVEL1 0xFFFF0000
106
107 /* stm32lx RCC register locations */
108 #define RCC_CR 0x40023800
109 #define RCC_ICSCR 0x40023804
110 #define RCC_CFGR 0x40023808
111
112 /* RCC_ICSCR bits */
113 #define RCC_ICSCR__MSIRANGE_MASK (7<<13)
114
115 static int stm32lx_unlock_program_memory(struct flash_bank *bank);
116 static int stm32lx_lock_program_memory(struct flash_bank *bank);
117 static int stm32lx_enable_write_half_page(struct flash_bank *bank);
118 static int stm32lx_erase_sector(struct flash_bank *bank, int sector);
119 static int stm32lx_wait_until_bsy_clear(struct flash_bank *bank);
120
121 struct stm32lx_flash_bank {
122 struct working_area *write_algorithm;
123 int probed;
124 };
125
126 /* flash bank stm32lx <base> <size> 0 0 <target#>
127 */
128 FLASH_BANK_COMMAND_HANDLER(stm32lx_flash_bank_command)
129 {
130 struct stm32lx_flash_bank *stm32lx_info;
131 if (CMD_ARGC < 6)
132 return ERROR_COMMAND_SYNTAX_ERROR;
133
134 /* Create the bank structure */
135 stm32lx_info = malloc(sizeof(struct stm32lx_flash_bank));
136
137 /* Check allocation */
138 if (stm32lx_info == NULL) {
139 LOG_ERROR("failed to allocate bank structure");
140 return ERROR_FAIL;
141 }
142
143 bank->driver_priv = stm32lx_info;
144
145 stm32lx_info->write_algorithm = NULL;
146 stm32lx_info->probed = 0;
147
148 return ERROR_OK;
149 }
150
151 static int stm32lx_protect_check(struct flash_bank *bank)
152 {
153 int retval;
154 struct target *target = bank->target;
155
156 uint32_t wrpr;
157
158 if (target->state != TARGET_HALTED) {
159 LOG_ERROR("Target not halted");
160 return ERROR_TARGET_NOT_HALTED;
161 }
162
163 /*
164 * Read the WRPR word, and check each bit (corresponding to each
165 * flash sector
166 */
167 retval = target_read_u32(target, FLASH_WRPR, &wrpr);
168 if (retval != ERROR_OK)
169 return retval;
170
171 for (int i = 0; i < 32; i++) {
172 if (wrpr & (1 << i))
173 bank->sectors[i].is_protected = 1;
174 else
175 bank->sectors[i].is_protected = 0;
176 }
177 return ERROR_OK;
178 }
179
180 static int stm32lx_erase(struct flash_bank *bank, int first, int last)
181 {
182 int retval;
183
184 /*
185 * It could be possible to do a mass erase if all sectors must be
186 * erased, but it is not implemented yet.
187 */
188
189 if (bank->target->state != TARGET_HALTED) {
190 LOG_ERROR("Target not halted");
191 return ERROR_TARGET_NOT_HALTED;
192 }
193
194 /*
195 * Loop over the selected sectors and erase them
196 */
197 for (int i = first; i <= last; i++) {
198 retval = stm32lx_erase_sector(bank, i);
199 if (retval != ERROR_OK)
200 return retval;
201 bank->sectors[i].is_erased = 1;
202 }
203 return ERROR_OK;
204 }
205
206 static int stm32lx_protect(struct flash_bank *bank, int set, int first,
207 int last)
208 {
209 LOG_WARNING("protection of the STM32L flash is not implemented");
210 return ERROR_OK;
211 }
212
213 static int stm32lx_write_half_pages(struct flash_bank *bank, uint8_t *buffer,
214 uint32_t offset, uint32_t count)
215 {
216 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
217 struct target *target = bank->target;
218 uint32_t buffer_size = 4096 * 4;
219 struct working_area *source;
220 uint32_t address = bank->base + offset;
221
222 struct reg_param reg_params[5];
223 struct armv7m_algorithm armv7m_info;
224
225 int retval = ERROR_OK;
226 uint32_t reg32;
227
228 /* see contib/loaders/flash/stm32lx.s for src */
229
230 static const uint16_t stm32lx_flash_write_code_16[] = {
231 /* 00000000 <write_word-0x4>: */
232 0x2300, /* 0: 2300 movs r3, #0 */
233 0xe004, /* 2: e004 b.n e <test_done> */
234
235 /* 00000004 <write_word>: */
236 0xf851, 0xcb04, /* 4: f851 cb04 ldr.w ip, [r1], #4 */
237 0xf840, 0xcb04, /* 8: f840 cb04 str.w ip, [r0], #4 */
238 0x3301, /* c: 3301 adds r3, #1 */
239
240 /* 0000000e <test_done>: */
241 0x4293, /* e: 4293 cmp r3, r2 */
242 0xd3f8, /* 10: d3f8 bcc.n 4 <write_word> */
243 0xbe00, /* 12: be00 bkpt 0x0000 */
244
245 };
246
247 /* Flip endian */
248 uint8_t stm32lx_flash_write_code[sizeof(stm32lx_flash_write_code_16)];
249 for (unsigned int i = 0; i < sizeof(stm32lx_flash_write_code_16) / 2; i++) {
250 stm32lx_flash_write_code[i * 2 + 0] = stm32lx_flash_write_code_16[i]
251 & 0xff;
252 stm32lx_flash_write_code[i * 2 + 1] = (stm32lx_flash_write_code_16[i]
253 >> 8) & 0xff;
254 }
255 /* Check if there is an even number of half pages (128bytes) */
256 if (count % 128) {
257 LOG_ERROR("there should be an even number "
258 "of half pages = 128 bytes (count = %" PRIi32 " bytes)", count);
259 return ERROR_FAIL;
260 }
261
262 /* Allocate working area */
263 reg32 = sizeof(stm32lx_flash_write_code);
264 /* Add bytes to make 4byte aligned */
265 reg32 += (4 - (reg32 % 4)) % 4;
266 retval = target_alloc_working_area(target, reg32,
267 &stm32lx_info->write_algorithm);
268 if (retval != ERROR_OK)
269 return retval;
270
271 /* Write the flashing code */
272 retval = target_write_buffer(target,
273 stm32lx_info->write_algorithm->address,
274 sizeof(stm32lx_flash_write_code),
275 (uint8_t *)stm32lx_flash_write_code);
276 if (retval != ERROR_OK) {
277 target_free_working_area(target, stm32lx_info->write_algorithm);
278 return retval;
279 }
280
281 /* Allocate half pages memory */
282 while (target_alloc_working_area_try(target, buffer_size, &source)
283 != ERROR_OK) {
284 if (buffer_size > 1024)
285 buffer_size -= 1024;
286 else
287 buffer_size /= 2;
288
289 if (buffer_size <= 256) {
290 /* if we already allocated the writing code, but failed to get a
291 * buffer, free the algorithm */
292 if (stm32lx_info->write_algorithm)
293 target_free_working_area(target, stm32lx_info->write_algorithm);
294
295 LOG_WARNING("no large enough working area available, can't do block memory writes");
296 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
297 }
298 }
299 LOG_DEBUG("allocated working area for data (%" PRIx32 " bytes)", buffer_size);
300
301 armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
302 armv7m_info.core_mode = ARMV7M_MODE_ANY;
303 init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
304 init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
305 init_reg_param(&reg_params[2], "r2", 32, PARAM_OUT);
306 init_reg_param(&reg_params[3], "r3", 32, PARAM_IN_OUT);
307 init_reg_param(&reg_params[4], "r4", 32, PARAM_OUT);
308
309 /* Enable half-page write */
310 retval = stm32lx_enable_write_half_page(bank);
311 if (retval != ERROR_OK) {
312 target_free_working_area(target, source);
313 target_free_working_area(target, stm32lx_info->write_algorithm);
314
315 destroy_reg_param(&reg_params[0]);
316 destroy_reg_param(&reg_params[1]);
317 destroy_reg_param(&reg_params[2]);
318 destroy_reg_param(&reg_params[3]);
319 return retval;
320 }
321
322 /* Loop while there are bytes to write */
323 while (count > 0) {
324 uint32_t this_count;
325 this_count = (count > buffer_size) ? buffer_size : count;
326
327 /* Write the next half pages */
328 retval = target_write_buffer(target, source->address, this_count,
329 buffer);
330 if (retval != ERROR_OK)
331 break;
332
333 /* 4: Store useful information in the registers */
334 /* the destination address of the copy (R0) */
335 buf_set_u32(reg_params[0].value, 0, 32, address);
336 /* The source address of the copy (R1) */
337 buf_set_u32(reg_params[1].value, 0, 32, source->address);
338 /* The length of the copy (R2) */
339 buf_set_u32(reg_params[2].value, 0, 32, this_count / 4);
340
341 /* 5: Execute the bunch of code */
342 retval = target_run_algorithm(target, 0, NULL, sizeof(reg_params)
343 / sizeof(*reg_params), reg_params,
344 stm32lx_info->write_algorithm->address, 0, 20000, &armv7m_info);
345 if (retval != ERROR_OK)
346 break;
347
348 /* 6: Wait while busy */
349 retval = stm32lx_wait_until_bsy_clear(bank);
350 if (retval != ERROR_OK)
351 break;
352
353 buffer += this_count;
354 address += this_count;
355 count -= this_count;
356 }
357
358 if (retval == ERROR_OK)
359 retval = stm32lx_lock_program_memory(bank);
360
361 target_free_working_area(target, source);
362 target_free_working_area(target, stm32lx_info->write_algorithm);
363
364 destroy_reg_param(&reg_params[0]);
365 destroy_reg_param(&reg_params[1]);
366 destroy_reg_param(&reg_params[2]);
367 destroy_reg_param(&reg_params[3]);
368
369 return retval;
370 }
371 static int stm32lx_write(struct flash_bank *bank, uint8_t *buffer,
372 uint32_t offset, uint32_t count)
373 {
374 struct target *target = bank->target;
375
376 uint32_t halfpages_number;
377 uint32_t words_remaining;
378 uint32_t bytes_remaining;
379 uint32_t address = bank->base + offset;
380 uint32_t bytes_written = 0;
381 int retval;
382
383 if (bank->target->state != TARGET_HALTED) {
384 LOG_ERROR("Target not halted");
385 return ERROR_TARGET_NOT_HALTED;
386 }
387
388 if (offset & 0x1) {
389 LOG_ERROR("offset 0x%" PRIx32 " breaks required 2-byte alignment", offset);
390 return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
391 }
392
393 /* Check if there are some full half pages */
394 if (((offset % 128) == 0) && (count >= 128)) {
395 halfpages_number = count / 128;
396 words_remaining = (count - 128 * halfpages_number) / 4;
397 bytes_remaining = (count & 0x3);
398 } else {
399 halfpages_number = 0;
400 words_remaining = (count / 4);
401 bytes_remaining = (count & 0x3);
402 }
403
404 if (halfpages_number) {
405 retval = stm32lx_write_half_pages(bank, buffer, offset, 128
406 * halfpages_number);
407 if (retval != ERROR_OK)
408 return ERROR_FAIL;
409 }
410
411 bytes_written = 128 * halfpages_number;
412
413 retval = stm32lx_unlock_program_memory(bank);
414 if (retval != ERROR_OK)
415 return retval;
416
417 while (words_remaining > 0) {
418 uint32_t value;
419 uint8_t *p = buffer + bytes_written;
420
421 /* Prepare the word, Little endian conversion */
422 value = p[0] + (p[1] << 8) + (p[2] << 16) + (p[3] << 24);
423
424 retval = target_write_u32(target, address, value);
425 if (retval != ERROR_OK)
426 return retval;
427
428 bytes_written += 4;
429 words_remaining--;
430 address += 4;
431
432 retval = stm32lx_wait_until_bsy_clear(bank);
433 if (retval != ERROR_OK)
434 return retval;
435 }
436
437 if (bytes_remaining) {
438 uint8_t last_word[4] = {0xff, 0xff, 0xff, 0xff};
439
440 /* copy the last remaining bytes into the write buffer */
441 memcpy(last_word, buffer+bytes_written, bytes_remaining);
442
443 retval = target_write_buffer(target, address, 4, last_word);
444 if (retval != ERROR_OK)
445 return retval;
446
447 retval = stm32lx_wait_until_bsy_clear(bank);
448 if (retval != ERROR_OK)
449 return retval;
450 }
451
452 retval = stm32lx_lock_program_memory(bank);
453 if (retval != ERROR_OK)
454 return retval;
455
456 return ERROR_OK;
457 }
458
459 static int stm32lx_probe(struct flash_bank *bank)
460 {
461 struct target *target = bank->target;
462 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
463 int i;
464 uint16_t flash_size;
465 uint32_t device_id;
466
467 stm32lx_info->probed = 0;
468
469 /* read stm32 device id register */
470 int retval = target_read_u32(target, DBGMCU_IDCODE, &device_id);
471 if (retval != ERROR_OK)
472 return retval;
473
474 LOG_DEBUG("device id = 0x%08" PRIx32 "", device_id);
475
476 if ((device_id & 0xfff) != 0x416) {
477 LOG_WARNING("Cannot identify target as a STM32L family.");
478 return ERROR_FAIL;
479 }
480
481 /* get flash size from target. */
482 retval = target_read_u16(target, F_SIZE, &flash_size);
483 if (retval != ERROR_OK)
484 return retval;
485
486 /* check for valid flash size */
487 if (flash_size == 0xffff) {
488 /* number of sectors incorrect on revA */
489 LOG_ERROR("STM32 flash size failed, probe inaccurate");
490 return ERROR_FAIL;
491 }
492
493 /* STM32L - we have 32 sectors, 16 pages per sector -> 512 pages
494 * 16 pages for a protection area */
495
496 /* calculate numbers of sectors (4kB per sector) */
497 int num_sectors = (flash_size * 1024) / FLASH_SECTOR_SIZE;
498 LOG_INFO("flash size = %dkbytes", flash_size);
499
500 if (bank->sectors) {
501 free(bank->sectors);
502 bank->sectors = NULL;
503 }
504
505 bank->base = FLASH_BANK0_ADDRESS;
506 bank->size = flash_size * 1024;
507 bank->num_sectors = num_sectors;
508 bank->sectors = malloc(sizeof(struct flash_sector) * num_sectors);
509 if (bank->sectors == NULL) {
510 LOG_ERROR("failed to allocate bank sectors");
511 return ERROR_FAIL;
512 }
513
514 for (i = 0; i < num_sectors; i++) {
515 bank->sectors[i].offset = i * FLASH_SECTOR_SIZE;
516 bank->sectors[i].size = FLASH_SECTOR_SIZE;
517 bank->sectors[i].is_erased = -1;
518 bank->sectors[i].is_protected = 1;
519 }
520
521 stm32lx_info->probed = 1;
522
523 return ERROR_OK;
524 }
525
526 static int stm32lx_auto_probe(struct flash_bank *bank)
527 {
528 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
529
530 if (stm32lx_info->probed)
531 return ERROR_OK;
532
533 return stm32lx_probe(bank);
534 }
535
536 static int stm32lx_erase_check(struct flash_bank *bank)
537 {
538 struct target *target = bank->target;
539 const int buffer_size = 4096;
540 int i;
541 uint32_t nBytes;
542 int retval = ERROR_OK;
543
544 if (bank->target->state != TARGET_HALTED) {
545 LOG_ERROR("Target not halted");
546 return ERROR_TARGET_NOT_HALTED;
547 }
548
549 uint8_t *buffer = malloc(buffer_size);
550 if (buffer == NULL) {
551 LOG_ERROR("failed to allocate read buffer");
552 return ERROR_FAIL;
553 }
554
555 for (i = 0; i < bank->num_sectors; i++) {
556 uint32_t j;
557 bank->sectors[i].is_erased = 1;
558
559 /* Loop chunk by chunk over the sector */
560 for (j = 0; j < bank->sectors[i].size; j += buffer_size) {
561 uint32_t chunk;
562 chunk = buffer_size;
563 if (chunk > (j - bank->sectors[i].size))
564 chunk = (j - bank->sectors[i].size);
565
566 retval = target_read_memory(target, bank->base
567 + bank->sectors[i].offset + j, 4, chunk / 4, buffer);
568 if (retval != ERROR_OK)
569 break;
570
571 for (nBytes = 0; nBytes < chunk; nBytes++) {
572 if (buffer[nBytes] != 0x00) {
573 bank->sectors[i].is_erased = 0;
574 break;
575 }
576 }
577 }
578 if (retval != ERROR_OK)
579 break;
580 }
581 free(buffer);
582
583 return retval;
584 }
585
586 static int stm32lx_get_info(struct flash_bank *bank, char *buf, int buf_size)
587 {
588 /* This method must return a string displaying information about the bank */
589
590 struct target *target = bank->target;
591 uint32_t device_id;
592 int printed;
593
594 /* read stm32 device id register */
595 int retval = target_read_u32(target, DBGMCU_IDCODE, &device_id);
596 if (retval != ERROR_OK)
597 return retval;
598
599 if ((device_id & 0xfff) == 0x416) {
600 printed = snprintf(buf, buf_size, "stm32lx - Rev: ");
601 buf += printed;
602 buf_size -= printed;
603
604 switch (device_id >> 16) {
605 case 0x1000:
606 snprintf(buf, buf_size, "A");
607 break;
608
609 case 0x1008:
610 snprintf(buf, buf_size, "Y");
611 break;
612 default:
613 snprintf(buf, buf_size, "unknown");
614 break;
615 }
616 } else {
617 snprintf(buf, buf_size, "Cannot identify target as a stm32lx");
618 return ERROR_FAIL;
619 }
620
621 return ERROR_OK;
622 }
623
624 static const struct command_registration stm32lx_exec_command_handlers[] = {
625 COMMAND_REGISTRATION_DONE
626 };
627
628 static const struct command_registration stm32lx_command_handlers[] = {
629 {
630 .name = "stm32lx",
631 .mode = COMMAND_ANY,
632 .help = "stm32lx flash command group",
633 .usage = "",
634 .chain = stm32lx_exec_command_handlers,
635 },
636 COMMAND_REGISTRATION_DONE
637 };
638
639 struct flash_driver stm32lx_flash = {
640 .name = "stm32lx",
641 .commands = stm32lx_command_handlers,
642 .flash_bank_command = stm32lx_flash_bank_command,
643 .erase = stm32lx_erase,
644 .protect = stm32lx_protect,
645 .write = stm32lx_write,
646 .read = default_flash_read,
647 .probe = stm32lx_probe,
648 .auto_probe = stm32lx_auto_probe,
649 .erase_check = stm32lx_erase_check,
650 .protect_check = stm32lx_protect_check,
651 .info = stm32lx_get_info,
652 };
653
654 /* Static methods implementation */
655 static int stm32lx_unlock_program_memory(struct flash_bank *bank)
656 {
657 struct target *target = bank->target;
658 int retval;
659 uint32_t reg32;
660
661 /*
662 * Unlocking the program memory is done by unlocking the PECR,
663 * then by writing the 2 PRGKEY to the PRGKEYR register
664 */
665
666 /* To unlock the PECR write the 2 PEKEY to the PEKEYR register */
667 retval = target_write_u32(target, FLASH_PEKEYR, PEKEY1);
668 if (retval != ERROR_OK)
669 return retval;
670
671 retval = target_write_u32(target, FLASH_PEKEYR, PEKEY2);
672 if (retval != ERROR_OK)
673 return retval;
674
675 /* Make sure it worked */
676 retval = target_read_u32(target, FLASH_PECR, &reg32);
677 if (retval != ERROR_OK)
678 return retval;
679
680 if (reg32 & FLASH_PECR__PELOCK) {
681 LOG_ERROR("PELOCK is not cleared :(");
682 return ERROR_FLASH_OPERATION_FAILED;
683 }
684
685 retval = target_write_u32(target, FLASH_PRGKEYR, PRGKEY1);
686 if (retval != ERROR_OK)
687 return retval;
688 retval = target_write_u32(target, FLASH_PRGKEYR, PRGKEY2);
689 if (retval != ERROR_OK)
690 return retval;
691
692 /* Make sure it worked */
693 retval = target_read_u32(target, FLASH_PECR, &reg32);
694 if (retval != ERROR_OK)
695 return retval;
696
697 if (reg32 & FLASH_PECR__PRGLOCK) {
698 LOG_ERROR("PRGLOCK is not cleared :(");
699 return ERROR_FLASH_OPERATION_FAILED;
700 }
701 return ERROR_OK;
702 }
703
704 static int stm32lx_enable_write_half_page(struct flash_bank *bank)
705 {
706 struct target *target = bank->target;
707 int retval;
708 uint32_t reg32;
709
710 /**
711 * Unlock the program memory, then set the FPRG bit in the PECR register.
712 */
713 retval = stm32lx_unlock_program_memory(bank);
714 if (retval != ERROR_OK)
715 return retval;
716
717 retval = target_read_u32(target, FLASH_PECR, &reg32);
718 if (retval != ERROR_OK)
719 return retval;
720
721 reg32 |= FLASH_PECR__FPRG;
722 retval = target_write_u32(target, FLASH_PECR, reg32);
723 if (retval != ERROR_OK)
724 return retval;
725
726 retval = target_read_u32(target, FLASH_PECR, &reg32);
727 if (retval != ERROR_OK)
728 return retval;
729
730 reg32 |= FLASH_PECR__PROG;
731 retval = target_write_u32(target, FLASH_PECR, reg32);
732
733 return retval;
734 }
735
736 static int stm32lx_lock_program_memory(struct flash_bank *bank)
737 {
738 struct target *target = bank->target;
739 int retval;
740 uint32_t reg32;
741
742 /* To lock the program memory, simply set the lock bit and lock PECR */
743
744 retval = target_read_u32(target, FLASH_PECR, &reg32);
745 if (retval != ERROR_OK)
746 return retval;
747
748 reg32 |= FLASH_PECR__PRGLOCK;
749 retval = target_write_u32(target, FLASH_PECR, reg32);
750 if (retval != ERROR_OK)
751 return retval;
752
753 retval = target_read_u32(target, FLASH_PECR, &reg32);
754 if (retval != ERROR_OK)
755 return retval;
756
757 reg32 |= FLASH_PECR__PELOCK;
758 retval = target_write_u32(target, FLASH_PECR, reg32);
759 if (retval != ERROR_OK)
760 return retval;
761
762 return ERROR_OK;
763 }
764
765 static int stm32lx_erase_sector(struct flash_bank *bank, int sector)
766 {
767 struct target *target = bank->target;
768 int retval;
769 uint32_t reg32;
770
771 /*
772 * To erase a sector (i.e. FLASH_PAGES_PER_SECTOR pages),
773 * first unlock the memory, loop over the pages of this sector
774 * and write 0x0 to its first word.
775 */
776
777 retval = stm32lx_unlock_program_memory(bank);
778 if (retval != ERROR_OK)
779 return retval;
780
781 for (int page = 0; page < FLASH_PAGES_PER_SECTOR; page++) {
782 reg32 = FLASH_PECR__PROG | FLASH_PECR__ERASE;
783 retval = target_write_u32(target, FLASH_PECR, reg32);
784 if (retval != ERROR_OK)
785 return retval;
786
787 retval = stm32lx_wait_until_bsy_clear(bank);
788 if (retval != ERROR_OK)
789 return retval;
790
791 uint32_t addr = bank->base + bank->sectors[sector].offset + (page
792 * FLASH_PAGE_SIZE);
793 retval = target_write_u32(target, addr, 0x0);
794 if (retval != ERROR_OK)
795 return retval;
796
797 retval = stm32lx_wait_until_bsy_clear(bank);
798 if (retval != ERROR_OK)
799 return retval;
800 }
801
802 retval = stm32lx_lock_program_memory(bank);
803 if (retval != ERROR_OK)
804 return retval;
805
806 return ERROR_OK;
807 }
808
809 static int stm32lx_wait_until_bsy_clear(struct flash_bank *bank)
810 {
811 struct target *target = bank->target;
812 uint32_t status;
813 int retval = ERROR_OK;
814 int timeout = 100;
815
816 /* wait for busy to clear */
817 for (;;) {
818 retval = target_read_u32(target, FLASH_SR, &status);
819 if (retval != ERROR_OK)
820 return retval;
821
822 if ((status & FLASH_SR__BSY) == 0)
823 break;
824 if (timeout-- <= 0) {
825 LOG_ERROR("timed out waiting for flash");
826 return ERROR_FAIL;
827 }
828 alive_sleep(1);
829 }
830
831 if (status & FLASH_SR__WRPERR) {
832 LOG_ERROR("access denied / write protected");
833 retval = ERROR_FAIL;
834 }
835
836 if (status & FLASH_SR__PGAERR) {
837 LOG_ERROR("invalid program address");
838 retval = ERROR_FAIL;
839 }
840
841 return retval;
842 }
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