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stm32lx: Add support for lock/unlock (RDP Level 0<->1)
[openocd.git] / src / flash / nor / stm32lx.c
blob2ae58cc017d64231cc1c8af8db82b73b378dc444
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 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 #include <target/cortex_m.h>
36
37 /* stm32lx flash register locations */
38
39 #define FLASH_ACR 0x00
40 #define FLASH_PECR 0x04
41 #define FLASH_PDKEYR 0x08
42 #define FLASH_PEKEYR 0x0C
43 #define FLASH_PRGKEYR 0x10
44 #define FLASH_OPTKEYR 0x14
45 #define FLASH_SR 0x18
46 #define FLASH_OBR 0x1C
47 #define FLASH_WRPR 0x20
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 DBGMCU_IDCODE_L0 0x40015800
90
91 /* Constants */
92 #define FLASH_SECTOR_SIZE 4096
93 #define FLASH_BANK0_ADDRESS 0x08000000
94
95 /* option bytes */
96 #define OPTION_BYTES_ADDRESS 0x1FF80000
97
98 #define OPTION_BYTE_0_PR1 0xFFFF0000
99 #define OPTION_BYTE_0_PR0 0xFF5500AA
100
101 static int stm32lx_unlock_program_memory(struct flash_bank *bank);
102 static int stm32lx_lock_program_memory(struct flash_bank *bank);
103 static int stm32lx_enable_write_half_page(struct flash_bank *bank);
104 static int stm32lx_erase_sector(struct flash_bank *bank, int sector);
105 static int stm32lx_wait_until_bsy_clear(struct flash_bank *bank);
106 static int stm32lx_lock(struct flash_bank *bank);
107 static int stm32lx_unlock(struct flash_bank *bank);
108 static int stm32lx_mass_erase(struct flash_bank *bank);
109 static int stm32lx_wait_until_bsy_clear_timeout(struct flash_bank *bank, int timeout);
110
111 struct stm32lx_rev {
112 uint16_t rev;
113 const char *str;
114 };
115
116 struct stm32lx_part_info {
117 uint16_t id;
118 const char *device_str;
119 const struct stm32lx_rev *revs;
120 size_t num_revs;
121 unsigned int page_size;
122 unsigned int pages_per_sector;
123 uint16_t max_flash_size_kb;
124 uint16_t first_bank_size_kb; /* used when has_dual_banks is true */
125 bool has_dual_banks;
126
127 uint32_t flash_base; /* Flash controller registers location */
128 uint32_t fsize_base; /* Location of FSIZE register */
129 };
130
131 struct stm32lx_flash_bank {
132 int probed;
133 uint32_t idcode;
134 uint32_t user_bank_size;
135 uint32_t flash_base;
136
137 const struct stm32lx_part_info *part_info;
138 };
139
140 static const struct stm32lx_rev stm32_416_revs[] = {
141 { 0x1000, "A" }, { 0x1008, "Y" }, { 0x1038, "W" }, { 0x1078, "V" },
142 };
143 static const struct stm32lx_rev stm32_417_revs[] = {
144 { 0x1000, "A" }, { 0x1008, "Z" }, { 0x1018, "Y" }, { 0x1038, "X" }
145 };
146 static const struct stm32lx_rev stm32_425_revs[] = {
147 { 0x1000, "A" }, { 0x2000, "B" }, { 0x2008, "Y" },
148 };
149 static const struct stm32lx_rev stm32_427_revs[] = {
150 { 0x1000, "A" }, { 0x1018, "Y" }, { 0x1038, "X" },
151 };
152 static const struct stm32lx_rev stm32_429_revs[] = {
153 { 0x1000, "A" }, { 0x1018, "Z" },
154 };
155 static const struct stm32lx_rev stm32_436_revs[] = {
156 { 0x1000, "A" }, { 0x1008, "Z" }, { 0x1018, "Y" },
157 };
158 static const struct stm32lx_rev stm32_437_revs[] = {
159 { 0x1000, "A" },
160 };
161 static const struct stm32lx_rev stm32_447_revs[] = {
162 { 0x1000, "A" }, { 0x2000, "B" }, { 0x2008, "Z" },
163 };
164 static const struct stm32lx_rev stm32_457_revs[] = {
165 { 0x1000, "A" }, { 0x1008, "Z" },
166 };
167
168 static const struct stm32lx_part_info stm32lx_parts[] = {
169 {
170 .id = 0x416,
171 .revs = stm32_416_revs,
172 .num_revs = ARRAY_SIZE(stm32_416_revs),
173 .device_str = "STM32L1xx (Cat.1 - Low/Medium Density)",
174 .page_size = 256,
175 .pages_per_sector = 16,
176 .max_flash_size_kb = 128,
177 .has_dual_banks = false,
178 .flash_base = 0x40023C00,
179 .fsize_base = 0x1FF8004C,
180 },
181 {
182 .id = 0x417,
183 .revs = stm32_417_revs,
184 .num_revs = ARRAY_SIZE(stm32_417_revs),
185 .device_str = "STM32L0xx (Cat. 3)",
186 .page_size = 128,
187 .pages_per_sector = 32,
188 .max_flash_size_kb = 64,
189 .has_dual_banks = false,
190 .flash_base = 0x40022000,
191 .fsize_base = 0x1FF8007C,
192 },
193 {
194 .id = 0x425,
195 .revs = stm32_425_revs,
196 .num_revs = ARRAY_SIZE(stm32_425_revs),
197 .device_str = "STM32L0xx (Cat. 2)",
198 .page_size = 128,
199 .pages_per_sector = 32,
200 .max_flash_size_kb = 32,
201 .has_dual_banks = false,
202 .flash_base = 0x40022000,
203 .fsize_base = 0x1FF8007C,
204 },
205 {
206 .id = 0x427,
207 .revs = stm32_427_revs,
208 .num_revs = ARRAY_SIZE(stm32_427_revs),
209 .device_str = "STM32L1xx (Cat.3 - Medium+ Density)",
210 .page_size = 256,
211 .pages_per_sector = 16,
212 .max_flash_size_kb = 256,
213 .first_bank_size_kb = 192,
214 .has_dual_banks = true,
215 .flash_base = 0x40023C00,
216 .fsize_base = 0x1FF800CC,
217 },
218 {
219 .id = 0x429,
220 .revs = stm32_429_revs,
221 .num_revs = ARRAY_SIZE(stm32_429_revs),
222 .device_str = "STM32L1xx (Cat.2)",
223 .page_size = 256,
224 .pages_per_sector = 16,
225 .max_flash_size_kb = 128,
226 .has_dual_banks = false,
227 .flash_base = 0x40023C00,
228 .fsize_base = 0x1FF8004C,
229 },
230 {
231 .id = 0x436,
232 .revs = stm32_436_revs,
233 .num_revs = ARRAY_SIZE(stm32_436_revs),
234 .device_str = "STM32L1xx (Cat.4/Cat.3 - Medium+/High Density)",
235 .page_size = 256,
236 .pages_per_sector = 16,
237 .max_flash_size_kb = 384,
238 .first_bank_size_kb = 192,
239 .has_dual_banks = true,
240 .flash_base = 0x40023C00,
241 .fsize_base = 0x1FF800CC,
242 },
243 {
244 .id = 0x437,
245 .revs = stm32_437_revs,
246 .num_revs = ARRAY_SIZE(stm32_437_revs),
247 .device_str = "STM32L1xx (Cat.5/Cat.6)",
248 .page_size = 256,
249 .pages_per_sector = 16,
250 .max_flash_size_kb = 512,
251 .first_bank_size_kb = 256,
252 .has_dual_banks = true,
253 .flash_base = 0x40023C00,
254 .fsize_base = 0x1FF800CC,
255 },
256 {
257 .id = 0x447,
258 .revs = stm32_447_revs,
259 .num_revs = ARRAY_SIZE(stm32_447_revs),
260 .device_str = "STM32L0xx (Cat.5)",
261 .page_size = 128,
262 .pages_per_sector = 32,
263 .max_flash_size_kb = 192,
264 .first_bank_size_kb = 128,
265 .has_dual_banks = true,
266 .flash_base = 0x40022000,
267 .fsize_base = 0x1FF8007C,
268 },
269 {
270 .id = 0x457,
271 .revs = stm32_457_revs,
272 .num_revs = ARRAY_SIZE(stm32_457_revs),
273 .device_str = "STM32L0xx (Cat.1)",
274 .page_size = 128,
275 .pages_per_sector = 32,
276 .max_flash_size_kb = 16,
277 .has_dual_banks = false,
278 .flash_base = 0x40022000,
279 .fsize_base = 0x1FF8007C,
280 },
281 };
282
283 /* flash bank stm32lx <base> <size> 0 0 <target#>
284 */
285 FLASH_BANK_COMMAND_HANDLER(stm32lx_flash_bank_command)
286 {
287 struct stm32lx_flash_bank *stm32lx_info;
288 if (CMD_ARGC < 6)
289 return ERROR_COMMAND_SYNTAX_ERROR;
290
291 /* Create the bank structure */
292 stm32lx_info = calloc(1, sizeof(*stm32lx_info));
293
294 /* Check allocation */
295 if (stm32lx_info == NULL) {
296 LOG_ERROR("failed to allocate bank structure");
297 return ERROR_FAIL;
298 }
299
300 bank->driver_priv = stm32lx_info;
301
302 stm32lx_info->probed = 0;
303 stm32lx_info->user_bank_size = bank->size;
304
305 /* the stm32l erased value is 0x00 */
306 bank->default_padded_value = 0x00;
307
308 return ERROR_OK;
309 }
310
311 COMMAND_HANDLER(stm32lx_handle_mass_erase_command)
312 {
313 int i;
314
315 if (CMD_ARGC < 1)
316 return ERROR_COMMAND_SYNTAX_ERROR;
317
318 struct flash_bank *bank;
319 int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
320 if (ERROR_OK != retval)
321 return retval;
322
323 retval = stm32lx_mass_erase(bank);
324 if (retval == ERROR_OK) {
325 /* set all sectors as erased */
326 for (i = 0; i < bank->num_sectors; i++)
327 bank->sectors[i].is_erased = 1;
328
329 command_print(CMD_CTX, "stm32lx mass erase complete");
330 } else {
331 command_print(CMD_CTX, "stm32lx mass erase failed");
332 }
333
334 return retval;
335 }
336
337 COMMAND_HANDLER(stm32lx_handle_lock_command)
338 {
339 if (CMD_ARGC < 1)
340 return ERROR_COMMAND_SYNTAX_ERROR;
341
342 struct flash_bank *bank;
343 int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
344 if (ERROR_OK != retval)
345 return retval;
346
347 retval = stm32lx_lock(bank);
348
349 if (retval == ERROR_OK)
350 command_print(CMD_CTX, "STM32Lx locked, takes effect after power cycle.");
351 else
352 command_print(CMD_CTX, "STM32Lx lock failed");
353
354 return retval;
355 }
356
357 COMMAND_HANDLER(stm32lx_handle_unlock_command)
358 {
359 if (CMD_ARGC < 1)
360 return ERROR_COMMAND_SYNTAX_ERROR;
361
362 struct flash_bank *bank;
363 int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
364 if (ERROR_OK != retval)
365 return retval;
366
367 retval = stm32lx_unlock(bank);
368
369 if (retval == ERROR_OK)
370 command_print(CMD_CTX, "STM32Lx unlocked, takes effect after power cycle.");
371 else
372 command_print(CMD_CTX, "STM32Lx unlock failed");
373
374 return retval;
375 }
376
377 static int stm32lx_protect_check(struct flash_bank *bank)
378 {
379 int retval;
380 struct target *target = bank->target;
381 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
382
383 uint32_t wrpr;
384
385 /*
386 * Read the WRPR word, and check each bit (corresponding to each
387 * flash sector
388 */
389 retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_WRPR,
390 &wrpr);
391 if (retval != ERROR_OK)
392 return retval;
393
394 for (int i = 0; i < bank->num_sectors; i++) {
395 if (wrpr & (1 << i))
396 bank->sectors[i].is_protected = 1;
397 else
398 bank->sectors[i].is_protected = 0;
399 }
400 return ERROR_OK;
401 }
402
403 static int stm32lx_erase(struct flash_bank *bank, int first, int last)
404 {
405 int retval;
406
407 /*
408 * It could be possible to do a mass erase if all sectors must be
409 * erased, but it is not implemented yet.
410 */
411
412 if (bank->target->state != TARGET_HALTED) {
413 LOG_ERROR("Target not halted");
414 return ERROR_TARGET_NOT_HALTED;
415 }
416
417 /*
418 * Loop over the selected sectors and erase them
419 */
420 for (int i = first; i <= last; i++) {
421 retval = stm32lx_erase_sector(bank, i);
422 if (retval != ERROR_OK)
423 return retval;
424 bank->sectors[i].is_erased = 1;
425 }
426 return ERROR_OK;
427 }
428
429 static int stm32lx_protect(struct flash_bank *bank, int set, int first,
430 int last)
431 {
432 LOG_WARNING("protection of the STM32L flash is not implemented");
433 return ERROR_OK;
434 }
435
436 static int stm32lx_write_half_pages(struct flash_bank *bank, const uint8_t *buffer,
437 uint32_t offset, uint32_t count)
438 {
439 struct target *target = bank->target;
440 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
441
442 uint32_t hp_nb = stm32lx_info->part_info->page_size / 2;
443 uint32_t buffer_size = 16384;
444 struct working_area *write_algorithm;
445 struct working_area *source;
446 uint32_t address = bank->base + offset;
447
448 struct reg_param reg_params[3];
449 struct armv7m_algorithm armv7m_info;
450
451 int retval = ERROR_OK;
452
453 /* see contib/loaders/flash/stm32lx.S for src */
454
455 static const uint8_t stm32lx_flash_write_code[] = {
456 /* write_word: */
457 0x00, 0x23, /* movs r3, #0 */
458 0x04, 0xe0, /* b test_done */
459
460 /* write_word: */
461 0x51, 0xf8, 0x04, 0xcb, /* ldr ip, [r1], #4 */
462 0x40, 0xf8, 0x04, 0xcb, /* str ip, [r0], #4 */
463 0x01, 0x33, /* adds r3, #1 */
464
465 /* test_done: */
466 0x93, 0x42, /* cmp r3, r2 */
467 0xf8, 0xd3, /* bcc write_word */
468 0x00, 0xbe, /* bkpt 0 */
469 };
470
471 /* Make sure we're performing a half-page aligned write. */
472 if (count % hp_nb) {
473 LOG_ERROR("The byte count must be %" PRIu32 "B-aligned but count is %" PRIi32 "B)", hp_nb, count);
474 return ERROR_FAIL;
475 }
476
477 /* flash write code */
478 if (target_alloc_working_area(target, sizeof(stm32lx_flash_write_code),
479 &write_algorithm) != ERROR_OK) {
480 LOG_DEBUG("no working area for block memory writes");
481 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
482 }
483
484 /* Write the flashing code */
485 retval = target_write_buffer(target,
486 write_algorithm->address,
487 sizeof(stm32lx_flash_write_code),
488 stm32lx_flash_write_code);
489 if (retval != ERROR_OK) {
490 target_free_working_area(target, write_algorithm);
491 return retval;
492 }
493
494 /* Allocate half pages memory */
495 while (target_alloc_working_area_try(target, buffer_size, &source) != ERROR_OK) {
496 if (buffer_size > 1024)
497 buffer_size -= 1024;
498 else
499 buffer_size /= 2;
500
501 if (buffer_size <= stm32lx_info->part_info->page_size) {
502 /* we already allocated the writing code, but failed to get a
503 * buffer, free the algorithm */
504 target_free_working_area(target, write_algorithm);
505
506 LOG_WARNING("no large enough working area available, can't do block memory writes");
507 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
508 }
509 }
510
511 armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
512 armv7m_info.core_mode = ARM_MODE_THREAD;
513 init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
514 init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
515 init_reg_param(&reg_params[2], "r2", 32, PARAM_OUT);
516
517 /* Enable half-page write */
518 retval = stm32lx_enable_write_half_page(bank);
519 if (retval != ERROR_OK) {
520 target_free_working_area(target, source);
521 target_free_working_area(target, write_algorithm);
522
523 destroy_reg_param(&reg_params[0]);
524 destroy_reg_param(&reg_params[1]);
525 destroy_reg_param(&reg_params[2]);
526 return retval;
527 }
528
529 struct armv7m_common *armv7m = target_to_armv7m(target);
530 if (armv7m == NULL) {
531
532 /* something is very wrong if armv7m is NULL */
533 LOG_ERROR("unable to get armv7m target");
534 return retval;
535 }
536
537 /* save any DEMCR flags and configure target to catch any Hard Faults */
538 uint32_t demcr_save = armv7m->demcr;
539 armv7m->demcr = VC_HARDERR;
540
541 /* Loop while there are bytes to write */
542 while (count > 0) {
543 uint32_t this_count;
544 this_count = (count > buffer_size) ? buffer_size : count;
545
546 /* Write the next half pages */
547 retval = target_write_buffer(target, source->address, this_count, buffer);
548 if (retval != ERROR_OK)
549 break;
550
551 /* 4: Store useful information in the registers */
552 /* the destination address of the copy (R0) */
553 buf_set_u32(reg_params[0].value, 0, 32, address);
554 /* The source address of the copy (R1) */
555 buf_set_u32(reg_params[1].value, 0, 32, source->address);
556 /* The length of the copy (R2) */
557 buf_set_u32(reg_params[2].value, 0, 32, this_count / 4);
558
559 /* 5: Execute the bunch of code */
560 retval = target_run_algorithm(target, 0, NULL, sizeof(reg_params)
561 / sizeof(*reg_params), reg_params,
562 write_algorithm->address, 0, 10000, &armv7m_info);
563 if (retval != ERROR_OK)
564 break;
565
566 /* check for Hard Fault */
567 if (armv7m->exception_number == 3)
568 break;
569
570 /* 6: Wait while busy */
571 retval = stm32lx_wait_until_bsy_clear(bank);
572 if (retval != ERROR_OK)
573 break;
574
575 buffer += this_count;
576 address += this_count;
577 count -= this_count;
578 }
579
580 /* restore previous flags */
581 armv7m->demcr = demcr_save;
582
583 if (armv7m->exception_number == 3) {
584
585 /* the stm32l15x devices seem to have an issue when blank.
586 * if a ram loader is executed on a blank device it will
587 * Hard Fault, this issue does not happen for a already programmed device.
588 * A related issue is described in the stm32l151xx errata (Doc ID 17721 Rev 6 - 2.1.3).
589 * The workaround of handling the Hard Fault exception does work, but makes the
590 * loader more complicated, as a compromise we manually write the pages, programming time
591 * is reduced by 50% using this slower method.
592 */
593
594 LOG_WARNING("couldn't use loader, falling back to page memory writes");
595
596 while (count > 0) {
597 uint32_t this_count;
598 this_count = (count > hp_nb) ? hp_nb : count;
599
600 /* Write the next half pages */
601 retval = target_write_buffer(target, address, this_count, buffer);
602 if (retval != ERROR_OK)
603 break;
604
605 /* Wait while busy */
606 retval = stm32lx_wait_until_bsy_clear(bank);
607 if (retval != ERROR_OK)
608 break;
609
610 buffer += this_count;
611 address += this_count;
612 count -= this_count;
613 }
614 }
615
616 if (retval == ERROR_OK)
617 retval = stm32lx_lock_program_memory(bank);
618
619 target_free_working_area(target, source);
620 target_free_working_area(target, write_algorithm);
621
622 destroy_reg_param(&reg_params[0]);
623 destroy_reg_param(&reg_params[1]);
624 destroy_reg_param(&reg_params[2]);
625
626 return retval;
627 }
628
629 static int stm32lx_write(struct flash_bank *bank, const uint8_t *buffer,
630 uint32_t offset, uint32_t count)
631 {
632 struct target *target = bank->target;
633 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
634
635 uint32_t hp_nb = stm32lx_info->part_info->page_size / 2;
636 uint32_t halfpages_number;
637 uint32_t bytes_remaining = 0;
638 uint32_t address = bank->base + offset;
639 uint32_t bytes_written = 0;
640 int retval, retval2;
641
642 if (bank->target->state != TARGET_HALTED) {
643 LOG_ERROR("Target not halted");
644 return ERROR_TARGET_NOT_HALTED;
645 }
646
647 if (offset & 0x3) {
648 LOG_ERROR("offset 0x%" PRIx32 " breaks required 4-byte alignment", offset);
649 return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
650 }
651
652 retval = stm32lx_unlock_program_memory(bank);
653 if (retval != ERROR_OK)
654 return retval;
655
656 /* first we need to write any unaligned head bytes upto
657 * the next 128 byte page */
658
659 if (offset % hp_nb)
660 bytes_remaining = MIN(count, hp_nb - (offset % hp_nb));
661
662 while (bytes_remaining > 0) {
663 uint8_t value[4] = {0xff, 0xff, 0xff, 0xff};
664
665 /* copy remaining bytes into the write buffer */
666 uint32_t bytes_to_write = MIN(4, bytes_remaining);
667 memcpy(value, buffer + bytes_written, bytes_to_write);
668
669 retval = target_write_buffer(target, address, 4, value);
670 if (retval != ERROR_OK)
671 goto reset_pg_and_lock;
672
673 bytes_written += bytes_to_write;
674 bytes_remaining -= bytes_to_write;
675 address += 4;
676
677 retval = stm32lx_wait_until_bsy_clear(bank);
678 if (retval != ERROR_OK)
679 goto reset_pg_and_lock;
680 }
681
682 offset += bytes_written;
683 count -= bytes_written;
684
685 /* this should always pass this check here */
686 assert((offset % hp_nb) == 0);
687
688 /* calculate half pages */
689 halfpages_number = count / hp_nb;
690
691 if (halfpages_number) {
692 retval = stm32lx_write_half_pages(bank, buffer + bytes_written, offset, hp_nb * halfpages_number);
693 if (retval == ERROR_TARGET_RESOURCE_NOT_AVAILABLE) {
694 /* attempt slow memory writes */
695 LOG_WARNING("couldn't use block writes, falling back to single memory accesses");
696 halfpages_number = 0;
697 } else {
698 if (retval != ERROR_OK)
699 return ERROR_FAIL;
700 }
701 }
702
703 /* write any remaining bytes */
704 uint32_t page_bytes_written = hp_nb * halfpages_number;
705 bytes_written += page_bytes_written;
706 address += page_bytes_written;
707 bytes_remaining = count - page_bytes_written;
708
709 retval = stm32lx_unlock_program_memory(bank);
710 if (retval != ERROR_OK)
711 return retval;
712
713 while (bytes_remaining > 0) {
714 uint8_t value[4] = {0xff, 0xff, 0xff, 0xff};
715
716 /* copy remaining bytes into the write buffer */
717 uint32_t bytes_to_write = MIN(4, bytes_remaining);
718 memcpy(value, buffer + bytes_written, bytes_to_write);
719
720 retval = target_write_buffer(target, address, 4, value);
721 if (retval != ERROR_OK)
722 goto reset_pg_and_lock;
723
724 bytes_written += bytes_to_write;
725 bytes_remaining -= bytes_to_write;
726 address += 4;
727
728 retval = stm32lx_wait_until_bsy_clear(bank);
729 if (retval != ERROR_OK)
730 goto reset_pg_and_lock;
731 }
732
733 reset_pg_and_lock:
734 retval2 = stm32lx_lock_program_memory(bank);
735 if (retval == ERROR_OK)
736 retval = retval2;
737
738 return retval;
739 }
740
741 static int stm32lx_read_id_code(struct target *target, uint32_t *id)
742 {
743 /* read stm32 device id register */
744 int retval = target_read_u32(target, DBGMCU_IDCODE, id);
745 if (retval != ERROR_OK)
746 return retval;
747
748 /* STM32L0 parts will have 0 there, try reading the L0's location for
749 * DBG_IDCODE in case this is an L0 part. */
750 if (*id == 0)
751 retval = target_read_u32(target, DBGMCU_IDCODE_L0, id);
752
753 return retval;
754 }
755
756 static int stm32lx_probe(struct flash_bank *bank)
757 {
758 struct target *target = bank->target;
759 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
760 int i;
761 uint16_t flash_size_in_kb;
762 uint32_t device_id;
763 uint32_t base_address = FLASH_BANK0_ADDRESS;
764 uint32_t second_bank_base;
765
766 stm32lx_info->probed = 0;
767 stm32lx_info->part_info = NULL;
768
769 int retval = stm32lx_read_id_code(bank->target, &device_id);
770 if (retval != ERROR_OK)
771 return retval;
772
773 stm32lx_info->idcode = device_id;
774
775 LOG_DEBUG("device id = 0x%08" PRIx32 "", device_id);
776
777 for (unsigned int n = 0; n < ARRAY_SIZE(stm32lx_parts); n++) {
778 if ((device_id & 0xfff) == stm32lx_parts[n].id)
779 stm32lx_info->part_info = &stm32lx_parts[n];
780 }
781
782 if (!stm32lx_info->part_info) {
783 LOG_WARNING("Cannot identify target as a STM32L family.");
784 return ERROR_FAIL;
785 } else {
786 LOG_INFO("Device: %s", stm32lx_info->part_info->device_str);
787 }
788
789 stm32lx_info->flash_base = stm32lx_info->part_info->flash_base;
790
791 /* Get the flash size from target. */
792 retval = target_read_u16(target, stm32lx_info->part_info->fsize_base,
793 &flash_size_in_kb);
794
795 /* 0x436 devices report their flash size as a 0 or 1 code indicating 384K
796 * or 256K, respectively. Please see RM0038 r8 or newer and refer to
797 * section 30.1.1. */
798 if (retval == ERROR_OK && (device_id & 0xfff) == 0x436) {
799 if (flash_size_in_kb == 0)
800 flash_size_in_kb = 384;
801 else if (flash_size_in_kb == 1)
802 flash_size_in_kb = 256;
803 }
804
805 /* Failed reading flash size or flash size invalid (early silicon),
806 * default to max target family */
807 if (retval != ERROR_OK || flash_size_in_kb == 0xffff || flash_size_in_kb == 0) {
808 LOG_WARNING("STM32L flash size failed, probe inaccurate - assuming %dk flash",
809 stm32lx_info->part_info->max_flash_size_kb);
810 flash_size_in_kb = stm32lx_info->part_info->max_flash_size_kb;
811 } else if (flash_size_in_kb > stm32lx_info->part_info->max_flash_size_kb) {
812 LOG_WARNING("STM32L probed flash size assumed incorrect since FLASH_SIZE=%dk > %dk, - assuming %dk flash",
813 flash_size_in_kb, stm32lx_info->part_info->max_flash_size_kb,
814 stm32lx_info->part_info->max_flash_size_kb);
815 flash_size_in_kb = stm32lx_info->part_info->max_flash_size_kb;
816 }
817
818 if (stm32lx_info->part_info->has_dual_banks) {
819 /* Use the configured base address to determine if this is the first or second flash bank.
820 * Verify that the base address is reasonably correct and determine the flash bank size
821 */
822 second_bank_base = base_address +
823 stm32lx_info->part_info->first_bank_size_kb * 1024;
824 if (bank->base == second_bank_base || !bank->base) {
825 /* This is the second bank */
826 base_address = second_bank_base;
827 flash_size_in_kb = flash_size_in_kb -
828 stm32lx_info->part_info->first_bank_size_kb;
829 } else if (bank->base == base_address) {
830 /* This is the first bank */
831 flash_size_in_kb = stm32lx_info->part_info->first_bank_size_kb;
832 } else {
833 LOG_WARNING("STM32L flash bank base address config is incorrect."
834 " 0x%" PRIx32 " but should rather be 0x%" PRIx32 " or 0x%" PRIx32,
835 bank->base, base_address, second_bank_base);
836 return ERROR_FAIL;
837 }
838 LOG_INFO("STM32L flash has dual banks. Bank (%d) size is %dkb, base address is 0x%" PRIx32,
839 bank->bank_number, flash_size_in_kb, base_address);
840 } else {
841 LOG_INFO("STM32L flash size is %dkb, base address is 0x%" PRIx32, flash_size_in_kb, base_address);
842 }
843
844 /* if the user sets the size manually then ignore the probed value
845 * this allows us to work around devices that have a invalid flash size register value */
846 if (stm32lx_info->user_bank_size) {
847 flash_size_in_kb = stm32lx_info->user_bank_size / 1024;
848 LOG_INFO("ignoring flash probed value, using configured bank size: %dkbytes", flash_size_in_kb);
849 }
850
851 /* calculate numbers of sectors (4kB per sector) */
852 int num_sectors = (flash_size_in_kb * 1024) / FLASH_SECTOR_SIZE;
853
854 if (bank->sectors) {
855 free(bank->sectors);
856 bank->sectors = NULL;
857 }
858
859 bank->size = flash_size_in_kb * 1024;
860 bank->base = base_address;
861 bank->num_sectors = num_sectors;
862 bank->sectors = malloc(sizeof(struct flash_sector) * num_sectors);
863 if (bank->sectors == NULL) {
864 LOG_ERROR("failed to allocate bank sectors");
865 return ERROR_FAIL;
866 }
867
868 for (i = 0; i < num_sectors; i++) {
869 bank->sectors[i].offset = i * FLASH_SECTOR_SIZE;
870 bank->sectors[i].size = FLASH_SECTOR_SIZE;
871 bank->sectors[i].is_erased = -1;
872 bank->sectors[i].is_protected = 1;
873 }
874
875 stm32lx_info->probed = 1;
876
877 return ERROR_OK;
878 }
879
880 static int stm32lx_auto_probe(struct flash_bank *bank)
881 {
882 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
883
884 if (stm32lx_info->probed)
885 return ERROR_OK;
886
887 return stm32lx_probe(bank);
888 }
889
890 static int stm32lx_erase_check(struct flash_bank *bank)
891 {
892 struct target *target = bank->target;
893 const int buffer_size = 4096;
894 int i;
895 uint32_t nBytes;
896 int retval = ERROR_OK;
897
898 if (bank->target->state != TARGET_HALTED) {
899 LOG_ERROR("Target not halted");
900 return ERROR_TARGET_NOT_HALTED;
901 }
902
903 uint8_t *buffer = malloc(buffer_size);
904 if (buffer == NULL) {
905 LOG_ERROR("failed to allocate read buffer");
906 return ERROR_FAIL;
907 }
908
909 for (i = 0; i < bank->num_sectors; i++) {
910 uint32_t j;
911 bank->sectors[i].is_erased = 1;
912
913 /* Loop chunk by chunk over the sector */
914 for (j = 0; j < bank->sectors[i].size; j += buffer_size) {
915 uint32_t chunk;
916 chunk = buffer_size;
917 if (chunk > (j - bank->sectors[i].size))
918 chunk = (j - bank->sectors[i].size);
919
920 retval = target_read_memory(target, bank->base
921 + bank->sectors[i].offset + j, 4, chunk / 4, buffer);
922 if (retval != ERROR_OK)
923 break;
924
925 for (nBytes = 0; nBytes < chunk; nBytes++) {
926 if (buffer[nBytes] != 0x00) {
927 bank->sectors[i].is_erased = 0;
928 break;
929 }
930 }
931 }
932 if (retval != ERROR_OK)
933 break;
934 }
935 free(buffer);
936
937 return retval;
938 }
939
940 /* This method must return a string displaying information about the bank */
941 static int stm32lx_get_info(struct flash_bank *bank, char *buf, int buf_size)
942 {
943 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
944
945 if (!stm32lx_info->probed) {
946 int retval = stm32lx_probe(bank);
947 if (retval != ERROR_OK) {
948 snprintf(buf, buf_size,
949 "Unable to find bank information.");
950 return retval;
951 }
952 }
953
954 const struct stm32lx_part_info *info = stm32lx_info->part_info;
955
956 if (info) {
957 const char *rev_str = NULL;
958 uint16_t rev_id = stm32lx_info->idcode >> 16;
959
960 for (unsigned int i = 0; i < info->num_revs; i++)
961 if (rev_id == info->revs[i].rev)
962 rev_str = info->revs[i].str;
963
964 if (rev_str != NULL) {
965 snprintf(buf, buf_size,
966 "%s - Rev: %s",
967 stm32lx_info->part_info->device_str, rev_str);
968 } else {
969 snprintf(buf, buf_size,
970 "%s - Rev: unknown (0x%04x)",
971 stm32lx_info->part_info->device_str, rev_id);
972 }
973
974 return ERROR_OK;
975 } else {
976 snprintf(buf, buf_size, "Cannot identify target as a STM32Lx");
977
978 return ERROR_FAIL;
979 }
980 }
981
982 static const struct command_registration stm32lx_exec_command_handlers[] = {
983 {
984 .name = "mass_erase",
985 .handler = stm32lx_handle_mass_erase_command,
986 .mode = COMMAND_EXEC,
987 .usage = "bank_id",
988 .help = "Erase entire flash device. including available EEPROM",
989 },
990 {
991 .name = "lock",
992 .handler = stm32lx_handle_lock_command,
993 .mode = COMMAND_EXEC,
994 .usage = "bank_id",
995 .help = "Increase the readout protection to Level 1.",
996 },
997 {
998 .name = "unlock",
999 .handler = stm32lx_handle_unlock_command,
1000 .mode = COMMAND_EXEC,
1001 .usage = "bank_id",
1002 .help = "Lower the readout protection from Level 1 to 0.",
1003 },
1004 COMMAND_REGISTRATION_DONE
1005 };
1006
1007 static const struct command_registration stm32lx_command_handlers[] = {
1008 {
1009 .name = "stm32lx",
1010 .mode = COMMAND_ANY,
1011 .help = "stm32lx flash command group",
1012 .usage = "",
1013 .chain = stm32lx_exec_command_handlers,
1014 },
1015 COMMAND_REGISTRATION_DONE
1016 };
1017
1018 struct flash_driver stm32lx_flash = {
1019 .name = "stm32lx",
1020 .commands = stm32lx_command_handlers,
1021 .flash_bank_command = stm32lx_flash_bank_command,
1022 .erase = stm32lx_erase,
1023 .protect = stm32lx_protect,
1024 .write = stm32lx_write,
1025 .read = default_flash_read,
1026 .probe = stm32lx_probe,
1027 .auto_probe = stm32lx_auto_probe,
1028 .erase_check = stm32lx_erase_check,
1029 .protect_check = stm32lx_protect_check,
1030 .info = stm32lx_get_info,
1031 };
1032
1033 /* Static methods implementation */
1034 static int stm32lx_unlock_program_memory(struct flash_bank *bank)
1035 {
1036 struct target *target = bank->target;
1037 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
1038 int retval;
1039 uint32_t reg32;
1040
1041 /*
1042 * Unlocking the program memory is done by unlocking the PECR,
1043 * then by writing the 2 PRGKEY to the PRGKEYR register
1044 */
1045
1046 /* check flash is not already unlocked */
1047 retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1048 &reg32);
1049 if (retval != ERROR_OK)
1050 return retval;
1051
1052 if ((reg32 & FLASH_PECR__PRGLOCK) == 0)
1053 return ERROR_OK;
1054
1055 /* To unlock the PECR write the 2 PEKEY to the PEKEYR register */
1056 retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PEKEYR,
1057 PEKEY1);
1058 if (retval != ERROR_OK)
1059 return retval;
1060
1061 retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PEKEYR,
1062 PEKEY2);
1063 if (retval != ERROR_OK)
1064 return retval;
1065
1066 /* Make sure it worked */
1067 retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1068 &reg32);
1069 if (retval != ERROR_OK)
1070 return retval;
1071
1072 if (reg32 & FLASH_PECR__PELOCK) {
1073 LOG_ERROR("PELOCK is not cleared :(");
1074 return ERROR_FLASH_OPERATION_FAILED;
1075 }
1076
1077 retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PRGKEYR,
1078 PRGKEY1);
1079 if (retval != ERROR_OK)
1080 return retval;
1081 retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PRGKEYR,
1082 PRGKEY2);
1083 if (retval != ERROR_OK)
1084 return retval;
1085
1086 /* Make sure it worked */
1087 retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1088 &reg32);
1089 if (retval != ERROR_OK)
1090 return retval;
1091
1092 if (reg32 & FLASH_PECR__PRGLOCK) {
1093 LOG_ERROR("PRGLOCK is not cleared :(");
1094 return ERROR_FLASH_OPERATION_FAILED;
1095 }
1096
1097 return ERROR_OK;
1098 }
1099
1100 static int stm32lx_enable_write_half_page(struct flash_bank *bank)
1101 {
1102 struct target *target = bank->target;
1103 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
1104 int retval;
1105 uint32_t reg32;
1106
1107 /**
1108 * Unlock the program memory, then set the FPRG bit in the PECR register.
1109 */
1110 retval = stm32lx_unlock_program_memory(bank);
1111 if (retval != ERROR_OK)
1112 return retval;
1113
1114 retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1115 &reg32);
1116 if (retval != ERROR_OK)
1117 return retval;
1118
1119 reg32 |= FLASH_PECR__FPRG;
1120 retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1121 reg32);
1122 if (retval != ERROR_OK)
1123 return retval;
1124
1125 retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1126 &reg32);
1127 if (retval != ERROR_OK)
1128 return retval;
1129
1130 reg32 |= FLASH_PECR__PROG;
1131 retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1132 reg32);
1133
1134 return retval;
1135 }
1136
1137 static int stm32lx_lock_program_memory(struct flash_bank *bank)
1138 {
1139 struct target *target = bank->target;
1140 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
1141 int retval;
1142 uint32_t reg32;
1143
1144 /* To lock the program memory, simply set the lock bit and lock PECR */
1145
1146 retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1147 &reg32);
1148 if (retval != ERROR_OK)
1149 return retval;
1150
1151 reg32 |= FLASH_PECR__PRGLOCK;
1152 retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1153 reg32);
1154 if (retval != ERROR_OK)
1155 return retval;
1156
1157 retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1158 &reg32);
1159 if (retval != ERROR_OK)
1160 return retval;
1161
1162 reg32 |= FLASH_PECR__PELOCK;
1163 retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1164 reg32);
1165 if (retval != ERROR_OK)
1166 return retval;
1167
1168 return ERROR_OK;
1169 }
1170
1171 static int stm32lx_erase_sector(struct flash_bank *bank, int sector)
1172 {
1173 struct target *target = bank->target;
1174 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
1175 int retval;
1176 uint32_t reg32;
1177
1178 /*
1179 * To erase a sector (i.e. stm32lx_info->part_info.pages_per_sector pages),
1180 * first unlock the memory, loop over the pages of this sector
1181 * and write 0x0 to its first word.
1182 */
1183
1184 retval = stm32lx_unlock_program_memory(bank);
1185 if (retval != ERROR_OK)
1186 return retval;
1187
1188 for (int page = 0; page < (int)stm32lx_info->part_info->pages_per_sector;
1189 page++) {
1190 reg32 = FLASH_PECR__PROG | FLASH_PECR__ERASE;
1191 retval = target_write_u32(target,
1192 stm32lx_info->flash_base + FLASH_PECR, reg32);
1193 if (retval != ERROR_OK)
1194 return retval;
1195
1196 retval = stm32lx_wait_until_bsy_clear(bank);
1197 if (retval != ERROR_OK)
1198 return retval;
1199
1200 uint32_t addr = bank->base + bank->sectors[sector].offset + (page
1201 * stm32lx_info->part_info->page_size);
1202 retval = target_write_u32(target, addr, 0x0);
1203 if (retval != ERROR_OK)
1204 return retval;
1205
1206 retval = stm32lx_wait_until_bsy_clear(bank);
1207 if (retval != ERROR_OK)
1208 return retval;
1209 }
1210
1211 retval = stm32lx_lock_program_memory(bank);
1212 if (retval != ERROR_OK)
1213 return retval;
1214
1215 return ERROR_OK;
1216 }
1217
1218 static inline int stm32lx_get_flash_status(struct flash_bank *bank, uint32_t *status)
1219 {
1220 struct target *target = bank->target;
1221 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
1222
1223 return target_read_u32(target, stm32lx_info->flash_base + FLASH_SR, status);
1224 }
1225
1226 static int stm32lx_wait_until_bsy_clear(struct flash_bank *bank)
1227 {
1228 return stm32lx_wait_until_bsy_clear_timeout(bank, 100);
1229 }
1230
1231 static int stm32lx_unlock_options_bytes(struct flash_bank *bank)
1232 {
1233 struct target *target = bank->target;
1234 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
1235 int retval;
1236 uint32_t reg32;
1237
1238 /*
1239 * Unlocking the options bytes is done by unlocking the PECR,
1240 * then by writing the 2 FLASH_PEKEYR to the FLASH_OPTKEYR register
1241 */
1242
1243 /* check flash is not already unlocked */
1244 retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_PECR, &reg32);
1245 if (retval != ERROR_OK)
1246 return retval;
1247
1248 if ((reg32 & FLASH_PECR__OPTLOCK) == 0)
1249 return ERROR_OK;
1250
1251 if ((reg32 & FLASH_PECR__PELOCK) != 0) {
1252
1253 retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PEKEYR, PEKEY1);
1254 if (retval != ERROR_OK)
1255 return retval;
1256
1257 retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PEKEYR, PEKEY2);
1258 if (retval != ERROR_OK)
1259 return retval;
1260 }
1261
1262 /* To unlock the PECR write the 2 OPTKEY to the FLASH_OPTKEYR register */
1263 retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_OPTKEYR, OPTKEY1);
1264 if (retval != ERROR_OK)
1265 return retval;
1266
1267 retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_OPTKEYR, OPTKEY2);
1268 if (retval != ERROR_OK)
1269 return retval;
1270
1271 return ERROR_OK;
1272 }
1273
1274 static int stm32lx_wait_until_bsy_clear_timeout(struct flash_bank *bank, int timeout)
1275 {
1276 struct target *target = bank->target;
1277 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
1278 uint32_t status;
1279 int retval = ERROR_OK;
1280
1281 /* wait for busy to clear */
1282 for (;;) {
1283 retval = stm32lx_get_flash_status(bank, &status);
1284 if (retval != ERROR_OK)
1285 return retval;
1286
1287 LOG_DEBUG("status: 0x%" PRIx32 "", status);
1288 if ((status & FLASH_SR__BSY) == 0)
1289 break;
1290
1291 if (timeout-- <= 0) {
1292 LOG_ERROR("timed out waiting for flash");
1293 return ERROR_FAIL;
1294 }
1295 alive_sleep(1);
1296 }
1297
1298 if (status & FLASH_SR__WRPERR) {
1299 LOG_ERROR("access denied / write protected");
1300 retval = ERROR_FAIL;
1301 }
1302
1303 if (status & FLASH_SR__PGAERR) {
1304 LOG_ERROR("invalid program address");
1305 retval = ERROR_FAIL;
1306 }
1307
1308 /* Clear but report errors */
1309 if (status & FLASH_SR__OPTVERR) {
1310 /* If this operation fails, we ignore it and report the original retval */
1311 target_write_u32(target, stm32lx_info->flash_base + FLASH_SR, status & FLASH_SR__OPTVERR);
1312 }
1313
1314 return retval;
1315 }
1316
1317 static int stm32lx_obl_launch(struct flash_bank *bank)
1318 {
1319 struct target *target = bank->target;
1320 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
1321 int retval;
1322
1323 /* This will fail as the target gets immediately rebooted */
1324 target_write_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1325 FLASH_PECR__OBL_LAUNCH);
1326
1327 size_t tries = 10;
1328 do {
1329 target_halt(target);
1330 retval = target_poll(target);
1331 } while (--tries > 0 &&
1332 (retval != ERROR_OK || target->state != TARGET_HALTED));
1333
1334 return tries ? ERROR_OK : ERROR_FAIL;
1335 }
1336
1337 static int stm32lx_lock(struct flash_bank *bank)
1338 {
1339 int retval;
1340 struct target *target = bank->target;
1341
1342 if (target->state != TARGET_HALTED) {
1343 LOG_ERROR("Target not halted");
1344 return ERROR_TARGET_NOT_HALTED;
1345 }
1346
1347 retval = stm32lx_unlock_options_bytes(bank);
1348 if (retval != ERROR_OK)
1349 return retval;
1350
1351 /* set the RDP protection level to 1 */
1352 retval = target_write_u32(target, OPTION_BYTES_ADDRESS, OPTION_BYTE_0_PR1);
1353 if (retval != ERROR_OK)
1354 return retval;
1355
1356 return ERROR_OK;
1357 }
1358
1359 static int stm32lx_unlock(struct flash_bank *bank)
1360 {
1361 int retval;
1362 struct target *target = bank->target;
1363
1364 if (target->state != TARGET_HALTED) {
1365 LOG_ERROR("Target not halted");
1366 return ERROR_TARGET_NOT_HALTED;
1367 }
1368
1369 retval = stm32lx_unlock_options_bytes(bank);
1370 if (retval != ERROR_OK)
1371 return retval;
1372
1373 /* set the RDP protection level to 0 */
1374 retval = target_write_u32(target, OPTION_BYTES_ADDRESS, OPTION_BYTE_0_PR0);
1375 if (retval != ERROR_OK)
1376 return retval;
1377
1378 retval = stm32lx_wait_until_bsy_clear_timeout(bank, 30000);
1379 if (retval != ERROR_OK)
1380 return retval;
1381
1382 return ERROR_OK;
1383 }
1384
1385 static int stm32lx_mass_erase(struct flash_bank *bank)
1386 {
1387 int retval;
1388 struct target *target = bank->target;
1389 struct stm32lx_flash_bank *stm32lx_info = NULL;
1390 uint32_t reg32;
1391
1392 if (target->state != TARGET_HALTED) {
1393 LOG_ERROR("Target not halted");
1394 return ERROR_TARGET_NOT_HALTED;
1395 }
1396
1397 stm32lx_info = bank->driver_priv;
1398
1399 retval = stm32lx_lock(bank);
1400 if (retval != ERROR_OK)
1401 return retval;
1402
1403 retval = stm32lx_obl_launch(bank);
1404 if (retval != ERROR_OK)
1405 return retval;
1406
1407 retval = stm32lx_unlock(bank);
1408 if (retval != ERROR_OK)
1409 return retval;
1410
1411 retval = stm32lx_obl_launch(bank);
1412 if (retval != ERROR_OK)
1413 return retval;
1414
1415 retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_PECR, &reg32);
1416 if (retval != ERROR_OK)
1417 return retval;
1418
1419 retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PECR, reg32 | FLASH_PECR__OPTLOCK);
1420 if (retval != ERROR_OK)
1421 return retval;
1422
1423 return ERROR_OK;
1424 }
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