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stm32lx flash: fix flash size for Medium+ devices
[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 * 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_BASE 0x40023C00
40 #define FLASH_ACR 0x40023C00
41 #define FLASH_PECR 0x40023C04
42 #define FLASH_PDKEYR 0x40023C08
43 #define FLASH_PEKEYR 0x40023C0C
44 #define FLASH_PRGKEYR 0x40023C10
45 #define FLASH_OPTKEYR 0x40023C14
46 #define FLASH_SR 0x40023C18
47 #define FLASH_OBR 0x40023C1C
48 #define FLASH_WRPR 0x40023C20
49
50 /* FLASH_ACR bites */
51 #define FLASH_ACR__LATENCY (1<<0)
52 #define FLASH_ACR__PRFTEN (1<<1)
53 #define FLASH_ACR__ACC64 (1<<2)
54 #define FLASH_ACR__SLEEP_PD (1<<3)
55 #define FLASH_ACR__RUN_PD (1<<4)
56
57 /* FLASH_PECR bits */
58 #define FLASH_PECR__PELOCK (1<<0)
59 #define FLASH_PECR__PRGLOCK (1<<1)
60 #define FLASH_PECR__OPTLOCK (1<<2)
61 #define FLASH_PECR__PROG (1<<3)
62 #define FLASH_PECR__DATA (1<<4)
63 #define FLASH_PECR__FTDW (1<<8)
64 #define FLASH_PECR__ERASE (1<<9)
65 #define FLASH_PECR__FPRG (1<<10)
66 #define FLASH_PECR__EOPIE (1<<16)
67 #define FLASH_PECR__ERRIE (1<<17)
68 #define FLASH_PECR__OBL_LAUNCH (1<<18)
69
70 /* FLASH_SR bits */
71 #define FLASH_SR__BSY (1<<0)
72 #define FLASH_SR__EOP (1<<1)
73 #define FLASH_SR__ENDHV (1<<2)
74 #define FLASH_SR__READY (1<<3)
75 #define FLASH_SR__WRPERR (1<<8)
76 #define FLASH_SR__PGAERR (1<<9)
77 #define FLASH_SR__SIZERR (1<<10)
78 #define FLASH_SR__OPTVERR (1<<11)
79
80 /* Unlock keys */
81 #define PEKEY1 0x89ABCDEF
82 #define PEKEY2 0x02030405
83 #define PRGKEY1 0x8C9DAEBF
84 #define PRGKEY2 0x13141516
85 #define OPTKEY1 0xFBEAD9C8
86 #define OPTKEY2 0x24252627
87
88 /* other registers */
89 #define DBGMCU_IDCODE 0xE0042000
90 #define F_SIZE 0x1FF8004C
91 #define F_SIZE_MP 0x1FF800CC /* on 0x427 Medium+ and 0x436 HD devices */
92
93 /* Constants */
94 #define FLASH_PAGE_SIZE 256
95 #define FLASH_SECTOR_SIZE 4096
96 #define FLASH_PAGES_PER_SECTOR 16
97 #define FLASH_BANK0_ADDRESS 0x08000000
98
99 /* stm32lx option byte register location */
100 #define OB_RDP 0x1FF80000
101 #define OB_USER 0x1FF80004
102 #define OB_WRP0_1 0x1FF80008
103 #define OB_WRP2_3 0x1FF8000C
104
105 /* OB_RDP values */
106 #define OB_RDP__LEVEL0 0xFF5500AA
107 #define OB_RDP__LEVEL1 0xFFFF0000
108
109 /* stm32lx RCC register locations */
110 #define RCC_CR 0x40023800
111 #define RCC_ICSCR 0x40023804
112 #define RCC_CFGR 0x40023808
113
114 /* RCC_ICSCR bits */
115 #define RCC_ICSCR__MSIRANGE_MASK (7<<13)
116
117 static int stm32lx_unlock_program_memory(struct flash_bank *bank);
118 static int stm32lx_lock_program_memory(struct flash_bank *bank);
119 static int stm32lx_enable_write_half_page(struct flash_bank *bank);
120 static int stm32lx_erase_sector(struct flash_bank *bank, int sector);
121 static int stm32lx_wait_until_bsy_clear(struct flash_bank *bank);
122
123 struct stm32lx_flash_bank {
124 int probed;
125 bool has_dual_banks;
126 uint32_t user_bank_size;
127 };
128
129 /* flash bank stm32lx <base> <size> 0 0 <target#>
130 */
131 FLASH_BANK_COMMAND_HANDLER(stm32lx_flash_bank_command)
132 {
133 struct stm32lx_flash_bank *stm32lx_info;
134 if (CMD_ARGC < 6)
135 return ERROR_COMMAND_SYNTAX_ERROR;
136
137 /* Create the bank structure */
138 stm32lx_info = malloc(sizeof(struct stm32lx_flash_bank));
139
140 /* Check allocation */
141 if (stm32lx_info == NULL) {
142 LOG_ERROR("failed to allocate bank structure");
143 return ERROR_FAIL;
144 }
145
146 bank->driver_priv = stm32lx_info;
147
148 stm32lx_info->probed = 0;
149 stm32lx_info->has_dual_banks = false;
150 stm32lx_info->user_bank_size = bank->size;
151
152 return ERROR_OK;
153 }
154
155 static int stm32lx_protect_check(struct flash_bank *bank)
156 {
157 int retval;
158 struct target *target = bank->target;
159
160 uint32_t wrpr;
161
162 /*
163 * Read the WRPR word, and check each bit (corresponding to each
164 * flash sector
165 */
166 retval = target_read_u32(target, FLASH_WRPR, &wrpr);
167 if (retval != ERROR_OK)
168 return retval;
169
170 for (int i = 0; i < 32; i++) {
171 if (wrpr & (1 << i))
172 bank->sectors[i].is_protected = 1;
173 else
174 bank->sectors[i].is_protected = 0;
175 }
176 return ERROR_OK;
177 }
178
179 static int stm32lx_erase(struct flash_bank *bank, int first, int last)
180 {
181 int retval;
182
183 /*
184 * It could be possible to do a mass erase if all sectors must be
185 * erased, but it is not implemented yet.
186 */
187
188 if (bank->target->state != TARGET_HALTED) {
189 LOG_ERROR("Target not halted");
190 return ERROR_TARGET_NOT_HALTED;
191 }
192
193 /*
194 * Loop over the selected sectors and erase them
195 */
196 for (int i = first; i <= last; i++) {
197 retval = stm32lx_erase_sector(bank, i);
198 if (retval != ERROR_OK)
199 return retval;
200 bank->sectors[i].is_erased = 1;
201 }
202 return ERROR_OK;
203 }
204
205 static int stm32lx_protect(struct flash_bank *bank, int set, int first,
206 int last)
207 {
208 LOG_WARNING("protection of the STM32L flash is not implemented");
209 return ERROR_OK;
210 }
211
212 static int stm32lx_write_half_pages(struct flash_bank *bank, uint8_t *buffer,
213 uint32_t offset, uint32_t count)
214 {
215 struct target *target = bank->target;
216 uint32_t buffer_size = 16384;
217 struct working_area *write_algorithm;
218 struct working_area *source;
219 uint32_t address = bank->base + offset;
220
221 struct reg_param reg_params[3];
222 struct armv7m_algorithm armv7m_info;
223
224 int retval = ERROR_OK;
225
226 /* see contib/loaders/flash/stm32lx.S for src */
227
228 static const uint8_t stm32lx_flash_write_code[] = {
229 /* write_word: */
230 0x00, 0x23, /* movs r3, #0 */
231 0x04, 0xe0, /* b test_done */
232
233 /* write_word: */
234 0x51, 0xf8, 0x04, 0xcb, /* ldr ip, [r1], #4 */
235 0x40, 0xf8, 0x04, 0xcb, /* str ip, [r0], #4 */
236 0x01, 0x33, /* adds r3, #1 */
237
238 /* test_done: */
239 0x93, 0x42, /* cmp r3, r2 */
240 0xf8, 0xd3, /* bcc write_word */
241 0x00, 0xbe, /* bkpt 0 */
242 };
243
244 /* Check if there is an even number of half pages (128bytes) */
245 if (count % 128) {
246 LOG_ERROR("there should be an even number "
247 "of half pages = 128 bytes (count = %" PRIi32 " bytes)", count);
248 return ERROR_FAIL;
249 }
250
251 /* flash write code */
252 if (target_alloc_working_area(target, sizeof(stm32lx_flash_write_code),
253 &write_algorithm) != ERROR_OK) {
254 LOG_DEBUG("no working area for block memory writes");
255 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
256 };
257
258 /* Write the flashing code */
259 retval = target_write_buffer(target,
260 write_algorithm->address,
261 sizeof(stm32lx_flash_write_code),
262 (uint8_t *)stm32lx_flash_write_code);
263 if (retval != ERROR_OK) {
264 target_free_working_area(target, write_algorithm);
265 return retval;
266 }
267
268 /* Allocate half pages memory */
269 while (target_alloc_working_area_try(target, buffer_size, &source) != ERROR_OK) {
270 if (buffer_size > 1024)
271 buffer_size -= 1024;
272 else
273 buffer_size /= 2;
274
275 if (buffer_size <= 256) {
276 /* we already allocated the writing code, but failed to get a
277 * buffer, free the algorithm */
278 target_free_working_area(target, write_algorithm);
279
280 LOG_WARNING("no large enough working area available, can't do block memory writes");
281 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
282 }
283 }
284
285 armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
286 armv7m_info.core_mode = ARM_MODE_THREAD;
287 init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
288 init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
289 init_reg_param(&reg_params[2], "r2", 32, PARAM_OUT);
290
291 /* Enable half-page write */
292 retval = stm32lx_enable_write_half_page(bank);
293 if (retval != ERROR_OK) {
294 target_free_working_area(target, source);
295 target_free_working_area(target, write_algorithm);
296
297 destroy_reg_param(&reg_params[0]);
298 destroy_reg_param(&reg_params[1]);
299 destroy_reg_param(&reg_params[2]);
300 return retval;
301 }
302
303 struct armv7m_common *armv7m = target_to_armv7m(target);
304 if (armv7m == NULL) {
305
306 /* something is very wrong if armv7m is NULL */
307 LOG_ERROR("unable to get armv7m target");
308 return retval;
309 }
310
311 /* save any DEMCR flags and configure target to catch any Hard Faults */
312 uint32_t demcr_save = armv7m->demcr;
313 armv7m->demcr = VC_HARDERR;
314
315 /* Loop while there are bytes to write */
316 while (count > 0) {
317 uint32_t this_count;
318 this_count = (count > buffer_size) ? buffer_size : count;
319
320 /* Write the next half pages */
321 retval = target_write_buffer(target, source->address, this_count, buffer);
322 if (retval != ERROR_OK)
323 break;
324
325 /* 4: Store useful information in the registers */
326 /* the destination address of the copy (R0) */
327 buf_set_u32(reg_params[0].value, 0, 32, address);
328 /* The source address of the copy (R1) */
329 buf_set_u32(reg_params[1].value, 0, 32, source->address);
330 /* The length of the copy (R2) */
331 buf_set_u32(reg_params[2].value, 0, 32, this_count / 4);
332
333 /* 5: Execute the bunch of code */
334 retval = target_run_algorithm(target, 0, NULL, sizeof(reg_params)
335 / sizeof(*reg_params), reg_params,
336 write_algorithm->address, 0, 10000, &armv7m_info);
337 if (retval != ERROR_OK)
338 break;
339
340 /* check for Hard Fault */
341 if (armv7m->exception_number == 3)
342 break;
343
344 /* 6: Wait while busy */
345 retval = stm32lx_wait_until_bsy_clear(bank);
346 if (retval != ERROR_OK)
347 break;
348
349 buffer += this_count;
350 address += this_count;
351 count -= this_count;
352 }
353
354 /* restore previous flags */
355 armv7m->demcr = demcr_save;
356
357 if (armv7m->exception_number == 3) {
358
359 /* the stm32l15x devices seem to have an issue when blank.
360 * if a ram loader is executed on a blank device it will
361 * Hard Fault, this issue does not happen for a already programmed device.
362 * A related issue is described in the stm32l151xx errata (Doc ID 17721 Rev 6 - 2.1.3).
363 * The workaround of handling the Hard Fault exception does work, but makes the
364 * loader more complicated, as a compromise we manually write the pages, programming time
365 * is reduced by 50% using this slower method.
366 */
367
368 LOG_WARNING("couldn't use loader, falling back to page memory writes");
369
370 while (count > 0) {
371 uint32_t this_count;
372 this_count = (count > 128) ? 128 : count;
373
374 /* Write the next half pages */
375 retval = target_write_buffer(target, address, this_count, buffer);
376 if (retval != ERROR_OK)
377 break;
378
379 /* Wait while busy */
380 retval = stm32lx_wait_until_bsy_clear(bank);
381 if (retval != ERROR_OK)
382 break;
383
384 buffer += this_count;
385 address += this_count;
386 count -= this_count;
387 }
388 }
389
390 if (retval == ERROR_OK)
391 retval = stm32lx_lock_program_memory(bank);
392
393 target_free_working_area(target, source);
394 target_free_working_area(target, write_algorithm);
395
396 destroy_reg_param(&reg_params[0]);
397 destroy_reg_param(&reg_params[1]);
398 destroy_reg_param(&reg_params[2]);
399
400 return retval;
401 }
402
403 static int stm32lx_write(struct flash_bank *bank, uint8_t *buffer,
404 uint32_t offset, uint32_t count)
405 {
406 struct target *target = bank->target;
407
408 uint32_t halfpages_number;
409 uint32_t bytes_remaining = 0;
410 uint32_t address = bank->base + offset;
411 uint32_t bytes_written = 0;
412 int retval, retval2;
413
414 if (bank->target->state != TARGET_HALTED) {
415 LOG_ERROR("Target not halted");
416 return ERROR_TARGET_NOT_HALTED;
417 }
418
419 if (offset & 0x3) {
420 LOG_ERROR("offset 0x%" PRIx32 " breaks required 4-byte alignment", offset);
421 return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
422 }
423
424 retval = stm32lx_unlock_program_memory(bank);
425 if (retval != ERROR_OK)
426 return retval;
427
428 /* first we need to write any unaligned head bytes upto
429 * the next 128 byte page */
430
431 if (offset % 128)
432 bytes_remaining = MIN(count, 128 - (offset % 128));
433
434 while (bytes_remaining > 0) {
435 uint8_t value[4] = {0xff, 0xff, 0xff, 0xff};
436
437 /* copy remaining bytes into the write buffer */
438 uint32_t bytes_to_write = MIN(4, bytes_remaining);
439 memcpy(value, buffer + bytes_written, bytes_to_write);
440
441 retval = target_write_buffer(target, address, 4, value);
442 if (retval != ERROR_OK)
443 goto reset_pg_and_lock;
444
445 bytes_written += bytes_to_write;
446 bytes_remaining -= bytes_to_write;
447 address += 4;
448
449 retval = stm32lx_wait_until_bsy_clear(bank);
450 if (retval != ERROR_OK)
451 goto reset_pg_and_lock;
452 }
453
454 offset += bytes_written;
455 count -= bytes_written;
456
457 /* this should always pass this check here */
458 assert((offset % 128) == 0);
459
460 /* calculate half pages */
461 halfpages_number = count / 128;
462
463 if (halfpages_number) {
464 retval = stm32lx_write_half_pages(bank, buffer + bytes_written, offset, 128 * halfpages_number);
465 if (retval == ERROR_TARGET_RESOURCE_NOT_AVAILABLE) {
466 /* attempt slow memory writes */
467 LOG_WARNING("couldn't use block writes, falling back to single memory accesses");
468 halfpages_number = 0;
469 } else {
470 if (retval != ERROR_OK)
471 return ERROR_FAIL;
472 }
473 }
474
475 /* write any remaining bytes */
476 uint32_t page_bytes_written = 128 * halfpages_number;
477 bytes_written += page_bytes_written;
478 address += page_bytes_written;
479 bytes_remaining = count - page_bytes_written;
480
481 retval = stm32lx_unlock_program_memory(bank);
482 if (retval != ERROR_OK)
483 return retval;
484
485 while (bytes_remaining > 0) {
486 uint8_t value[4] = {0xff, 0xff, 0xff, 0xff};
487
488 /* copy remaining bytes into the write buffer */
489 uint32_t bytes_to_write = MIN(4, bytes_remaining);
490 memcpy(value, buffer + bytes_written, bytes_to_write);
491
492 retval = target_write_buffer(target, address, 4, value);
493 if (retval != ERROR_OK)
494 goto reset_pg_and_lock;
495
496 bytes_written += bytes_to_write;
497 bytes_remaining -= bytes_to_write;
498 address += 4;
499
500 retval = stm32lx_wait_until_bsy_clear(bank);
501 if (retval != ERROR_OK)
502 goto reset_pg_and_lock;
503 }
504
505 reset_pg_and_lock:
506 retval2 = stm32lx_lock_program_memory(bank);
507 if (retval == ERROR_OK)
508 retval = retval2;
509
510 return retval;
511 }
512
513 static int stm32lx_probe(struct flash_bank *bank)
514 {
515 struct target *target = bank->target;
516 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
517 int i;
518 uint16_t flash_size_in_kb;
519 uint16_t max_flash_size_in_kb;
520 uint32_t device_id;
521 uint32_t base_address = FLASH_BANK0_ADDRESS;
522 uint32_t second_bank_base;
523 uint32_t first_bank_size_in_kb;
524
525 stm32lx_info->probed = 0;
526
527 /* read stm32 device id register */
528 int retval = target_read_u32(target, DBGMCU_IDCODE, &device_id);
529 if (retval != ERROR_OK)
530 return retval;
531
532 LOG_DEBUG("device id = 0x%08" PRIx32 "", device_id);
533
534 /* set max flash size depending on family */
535 switch (device_id & 0xfff) {
536 case 0x416:
537 max_flash_size_in_kb = 128;
538 break;
539 case 0x427:
540 /* single bank, high density */
541 max_flash_size_in_kb = 256;
542 break;
543 case 0x436:
544 /* According to ST, the devices with id 0x436 have dual bank flash and comes with
545 * a total flash size of 384k or 256kb. However, the first bank is always 192kb,
546 * and second one holds the rest. The reason is that the 256kb version is actually
547 * the same physical flash but only the first 256kb are verified.
548 */
549 max_flash_size_in_kb = 384;
550 first_bank_size_in_kb = 192;
551 stm32lx_info->has_dual_banks = true;
552 break;
553 default:
554 LOG_WARNING("Cannot identify target as a STM32L family.");
555 return ERROR_FAIL;
556 }
557
558 /* Get the flash size from target. 0x427 and 0x436 devices use a
559 * different location for the Flash Size register, please see RM0038 r8 or
560 * newer. */
561 if ((device_id & 0xfff) == 0x427 || (device_id & 0xfff) == 0x436)
562 retval = target_read_u16(target, F_SIZE_MP, &flash_size_in_kb);
563 else
564 retval = target_read_u16(target, F_SIZE, &flash_size_in_kb);
565
566 /* 0x436 devices report their flash size as a 0 or 1 code indicating 384K
567 * or 256K, respectively. Please see RM0038 r8 or newer and refer to
568 * section 30.1.1. */
569 if (retval == ERROR_OK && (device_id & 0xfff) == 0x436) {
570 if (flash_size_in_kb == 0)
571 flash_size_in_kb = 384;
572 else if (flash_size_in_kb == 1)
573 flash_size_in_kb = 256;
574 }
575
576 /* Failed reading flash size or flash size invalid (early silicon),
577 * default to max target family */
578 if (retval != ERROR_OK || flash_size_in_kb == 0xffff || flash_size_in_kb == 0) {
579 LOG_WARNING("STM32L flash size failed, probe inaccurate - assuming %dk flash",
580 max_flash_size_in_kb);
581 flash_size_in_kb = max_flash_size_in_kb;
582 } else if (flash_size_in_kb > max_flash_size_in_kb) {
583 LOG_WARNING("STM32L probed flash size assumed incorrect since FLASH_SIZE=%dk > %dk, - assuming %dk flash",
584 flash_size_in_kb, max_flash_size_in_kb, max_flash_size_in_kb);
585 flash_size_in_kb = max_flash_size_in_kb;
586 }
587
588 if (stm32lx_info->has_dual_banks) {
589 /* Use the configured base address to determine if this is the first or second flash bank.
590 * Verify that the base address is reasonably correct and determine the flash bank size
591 */
592 second_bank_base = base_address + first_bank_size_in_kb * 1024;
593 if (bank->base == second_bank_base) {
594 /* This is the second bank */
595 base_address = second_bank_base;
596 flash_size_in_kb = flash_size_in_kb - first_bank_size_in_kb;
597 } else if (bank->base == 0 || bank->base == base_address) {
598 /* This is the first bank */
599 flash_size_in_kb = first_bank_size_in_kb;
600 } else {
601 LOG_WARNING("STM32L flash bank base address config is incorrect. 0x%x but should rather be 0x%x or 0x%x",
602 bank->base, base_address, second_bank_base);
603 return ERROR_FAIL;
604 }
605 LOG_INFO("STM32L flash has dual banks. Bank (%d) size is %dkb, base address is 0x%x",
606 bank->bank_number, flash_size_in_kb, base_address);
607 } else {
608 LOG_INFO("STM32L flash size is %dkb, base address is 0x%x", flash_size_in_kb, base_address);
609 }
610
611 /* if the user sets the size manually then ignore the probed value
612 * this allows us to work around devices that have a invalid flash size register value */
613 if (stm32lx_info->user_bank_size) {
614 flash_size_in_kb = stm32lx_info->user_bank_size / 1024;
615 LOG_INFO("ignoring flash probed value, using configured bank size: %dkbytes", flash_size_in_kb);
616 }
617
618 /* STM32L - we have 32 sectors, 16 pages per sector -> 512 pages
619 * 16 pages for a protection area */
620
621 /* calculate numbers of sectors (4kB per sector) */
622 int num_sectors = (flash_size_in_kb * 1024) / FLASH_SECTOR_SIZE;
623
624 if (bank->sectors) {
625 free(bank->sectors);
626 bank->sectors = NULL;
627 }
628
629 bank->size = flash_size_in_kb * 1024;
630 bank->base = base_address;
631 bank->num_sectors = num_sectors;
632 bank->sectors = malloc(sizeof(struct flash_sector) * num_sectors);
633 if (bank->sectors == NULL) {
634 LOG_ERROR("failed to allocate bank sectors");
635 return ERROR_FAIL;
636 }
637
638 for (i = 0; i < num_sectors; i++) {
639 bank->sectors[i].offset = i * FLASH_SECTOR_SIZE;
640 bank->sectors[i].size = FLASH_SECTOR_SIZE;
641 bank->sectors[i].is_erased = -1;
642 bank->sectors[i].is_protected = 1;
643 }
644
645 stm32lx_info->probed = 1;
646
647 return ERROR_OK;
648 }
649
650 static int stm32lx_auto_probe(struct flash_bank *bank)
651 {
652 struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
653
654 if (stm32lx_info->probed)
655 return ERROR_OK;
656
657 return stm32lx_probe(bank);
658 }
659
660 static int stm32lx_erase_check(struct flash_bank *bank)
661 {
662 struct target *target = bank->target;
663 const int buffer_size = 4096;
664 int i;
665 uint32_t nBytes;
666 int retval = ERROR_OK;
667
668 if (bank->target->state != TARGET_HALTED) {
669 LOG_ERROR("Target not halted");
670 return ERROR_TARGET_NOT_HALTED;
671 }
672
673 uint8_t *buffer = malloc(buffer_size);
674 if (buffer == NULL) {
675 LOG_ERROR("failed to allocate read buffer");
676 return ERROR_FAIL;
677 }
678
679 for (i = 0; i < bank->num_sectors; i++) {
680 uint32_t j;
681 bank->sectors[i].is_erased = 1;
682
683 /* Loop chunk by chunk over the sector */
684 for (j = 0; j < bank->sectors[i].size; j += buffer_size) {
685 uint32_t chunk;
686 chunk = buffer_size;
687 if (chunk > (j - bank->sectors[i].size))
688 chunk = (j - bank->sectors[i].size);
689
690 retval = target_read_memory(target, bank->base
691 + bank->sectors[i].offset + j, 4, chunk / 4, buffer);
692 if (retval != ERROR_OK)
693 break;
694
695 for (nBytes = 0; nBytes < chunk; nBytes++) {
696 if (buffer[nBytes] != 0x00) {
697 bank->sectors[i].is_erased = 0;
698 break;
699 }
700 }
701 }
702 if (retval != ERROR_OK)
703 break;
704 }
705 free(buffer);
706
707 return retval;
708 }
709
710 static int stm32lx_get_info(struct flash_bank *bank, char *buf, int buf_size)
711 {
712 /* This method must return a string displaying information about the bank */
713
714 uint32_t dbgmcu_idcode;
715
716 /* read stm32 device id register */
717 int retval = target_read_u32(bank->target, DBGMCU_IDCODE, &dbgmcu_idcode);
718 if (retval != ERROR_OK)
719 return retval;
720
721 uint16_t device_id = dbgmcu_idcode & 0xfff;
722 uint16_t rev_id = dbgmcu_idcode >> 16;
723 const char *device_str;
724 const char *rev_str = NULL;
725
726 switch (device_id) {
727 case 0x416:
728 device_str = "STM32L1xx (Low/Medium Density)";
729
730 switch (rev_id) {
731 case 0x1000:
732 rev_str = "A";
733 break;
734
735 case 0x1008:
736 rev_str = "Y";
737 break;
738
739 case 0x1018:
740 rev_str = "X";
741 break;
742
743 case 0x1038:
744 rev_str = "W";
745 break;
746
747 case 0x1078:
748 rev_str = "V";
749 break;
750 }
751 break;
752
753 case 0x427:
754 device_str = "STM32L1xx (Medium+ Density)";
755
756 switch (rev_id) {
757 case 0x1018:
758 rev_str = "A";
759 break;
760 }
761 break;
762
763 case 0x436:
764 device_str = "STM32L1xx (Medium+/High Density)";
765
766 switch (rev_id) {
767 case 0x1000:
768 rev_str = "A";
769 break;
770
771 case 0x1008:
772 rev_str = "Z";
773 break;
774
775 case 0x1018:
776 rev_str = "Y";
777 break;
778 }
779 break;
780
781 default:
782 snprintf(buf, buf_size, "Cannot identify target as a STM32L1");
783 return ERROR_FAIL;
784 }
785
786 if (rev_str != NULL)
787 snprintf(buf, buf_size, "%s - Rev: %s", device_str, rev_str);
788 else
789 snprintf(buf, buf_size, "%s - Rev: unknown (0x%04x)", device_str, rev_id);
790
791 return ERROR_OK;
792 }
793
794 static const struct command_registration stm32lx_exec_command_handlers[] = {
795 COMMAND_REGISTRATION_DONE
796 };
797
798 static const struct command_registration stm32lx_command_handlers[] = {
799 {
800 .name = "stm32lx",
801 .mode = COMMAND_ANY,
802 .help = "stm32lx flash command group",
803 .usage = "",
804 .chain = stm32lx_exec_command_handlers,
805 },
806 COMMAND_REGISTRATION_DONE
807 };
808
809 struct flash_driver stm32lx_flash = {
810 .name = "stm32lx",
811 .commands = stm32lx_command_handlers,
812 .flash_bank_command = stm32lx_flash_bank_command,
813 .erase = stm32lx_erase,
814 .protect = stm32lx_protect,
815 .write = stm32lx_write,
816 .read = default_flash_read,
817 .probe = stm32lx_probe,
818 .auto_probe = stm32lx_auto_probe,
819 .erase_check = stm32lx_erase_check,
820 .protect_check = stm32lx_protect_check,
821 .info = stm32lx_get_info,
822 };
823
824 /* Static methods implementation */
825 static int stm32lx_unlock_program_memory(struct flash_bank *bank)
826 {
827 struct target *target = bank->target;
828 int retval;
829 uint32_t reg32;
830
831 /*
832 * Unlocking the program memory is done by unlocking the PECR,
833 * then by writing the 2 PRGKEY to the PRGKEYR register
834 */
835
836 /* check flash is not already unlocked */
837 retval = target_read_u32(target, FLASH_PECR, &reg32);
838 if (retval != ERROR_OK)
839 return retval;
840
841 if ((reg32 & FLASH_PECR__PRGLOCK) == 0)
842 return ERROR_OK;
843
844 /* To unlock the PECR write the 2 PEKEY to the PEKEYR register */
845 retval = target_write_u32(target, FLASH_PEKEYR, PEKEY1);
846 if (retval != ERROR_OK)
847 return retval;
848
849 retval = target_write_u32(target, FLASH_PEKEYR, PEKEY2);
850 if (retval != ERROR_OK)
851 return retval;
852
853 /* Make sure it worked */
854 retval = target_read_u32(target, FLASH_PECR, &reg32);
855 if (retval != ERROR_OK)
856 return retval;
857
858 if (reg32 & FLASH_PECR__PELOCK) {
859 LOG_ERROR("PELOCK is not cleared :(");
860 return ERROR_FLASH_OPERATION_FAILED;
861 }
862
863 retval = target_write_u32(target, FLASH_PRGKEYR, PRGKEY1);
864 if (retval != ERROR_OK)
865 return retval;
866 retval = target_write_u32(target, FLASH_PRGKEYR, PRGKEY2);
867 if (retval != ERROR_OK)
868 return retval;
869
870 /* Make sure it worked */
871 retval = target_read_u32(target, FLASH_PECR, &reg32);
872 if (retval != ERROR_OK)
873 return retval;
874
875 if (reg32 & FLASH_PECR__PRGLOCK) {
876 LOG_ERROR("PRGLOCK is not cleared :(");
877 return ERROR_FLASH_OPERATION_FAILED;
878 }
879
880 return ERROR_OK;
881 }
882
883 static int stm32lx_enable_write_half_page(struct flash_bank *bank)
884 {
885 struct target *target = bank->target;
886 int retval;
887 uint32_t reg32;
888
889 /**
890 * Unlock the program memory, then set the FPRG bit in the PECR register.
891 */
892 retval = stm32lx_unlock_program_memory(bank);
893 if (retval != ERROR_OK)
894 return retval;
895
896 retval = target_read_u32(target, FLASH_PECR, &reg32);
897 if (retval != ERROR_OK)
898 return retval;
899
900 reg32 |= FLASH_PECR__FPRG;
901 retval = target_write_u32(target, FLASH_PECR, reg32);
902 if (retval != ERROR_OK)
903 return retval;
904
905 retval = target_read_u32(target, FLASH_PECR, &reg32);
906 if (retval != ERROR_OK)
907 return retval;
908
909 reg32 |= FLASH_PECR__PROG;
910 retval = target_write_u32(target, FLASH_PECR, reg32);
911
912 return retval;
913 }
914
915 static int stm32lx_lock_program_memory(struct flash_bank *bank)
916 {
917 struct target *target = bank->target;
918 int retval;
919 uint32_t reg32;
920
921 /* To lock the program memory, simply set the lock bit and lock PECR */
922
923 retval = target_read_u32(target, FLASH_PECR, &reg32);
924 if (retval != ERROR_OK)
925 return retval;
926
927 reg32 |= FLASH_PECR__PRGLOCK;
928 retval = target_write_u32(target, FLASH_PECR, reg32);
929 if (retval != ERROR_OK)
930 return retval;
931
932 retval = target_read_u32(target, FLASH_PECR, &reg32);
933 if (retval != ERROR_OK)
934 return retval;
935
936 reg32 |= FLASH_PECR__PELOCK;
937 retval = target_write_u32(target, FLASH_PECR, reg32);
938 if (retval != ERROR_OK)
939 return retval;
940
941 return ERROR_OK;
942 }
943
944 static int stm32lx_erase_sector(struct flash_bank *bank, int sector)
945 {
946 struct target *target = bank->target;
947 int retval;
948 uint32_t reg32;
949
950 /*
951 * To erase a sector (i.e. FLASH_PAGES_PER_SECTOR pages),
952 * first unlock the memory, loop over the pages of this sector
953 * and write 0x0 to its first word.
954 */
955
956 retval = stm32lx_unlock_program_memory(bank);
957 if (retval != ERROR_OK)
958 return retval;
959
960 for (int page = 0; page < FLASH_PAGES_PER_SECTOR; page++) {
961 reg32 = FLASH_PECR__PROG | FLASH_PECR__ERASE;
962 retval = target_write_u32(target, FLASH_PECR, reg32);
963 if (retval != ERROR_OK)
964 return retval;
965
966 retval = stm32lx_wait_until_bsy_clear(bank);
967 if (retval != ERROR_OK)
968 return retval;
969
970 uint32_t addr = bank->base + bank->sectors[sector].offset + (page
971 * FLASH_PAGE_SIZE);
972 retval = target_write_u32(target, addr, 0x0);
973 if (retval != ERROR_OK)
974 return retval;
975
976 retval = stm32lx_wait_until_bsy_clear(bank);
977 if (retval != ERROR_OK)
978 return retval;
979 }
980
981 retval = stm32lx_lock_program_memory(bank);
982 if (retval != ERROR_OK)
983 return retval;
984
985 return ERROR_OK;
986 }
987
988 static int stm32lx_wait_until_bsy_clear(struct flash_bank *bank)
989 {
990 struct target *target = bank->target;
991 uint32_t status;
992 int retval = ERROR_OK;
993 int timeout = 100;
994
995 /* wait for busy to clear */
996 for (;;) {
997 retval = target_read_u32(target, FLASH_SR, &status);
998 if (retval != ERROR_OK)
999 return retval;
1000
1001 if ((status & FLASH_SR__BSY) == 0)
1002 break;
1003 if (timeout-- <= 0) {
1004 LOG_ERROR("timed out waiting for flash");
1005 return ERROR_FAIL;
1006 }
1007 alive_sleep(1);
1008 }
1009
1010 if (status & FLASH_SR__WRPERR) {
1011 LOG_ERROR("access denied / write protected");
1012 retval = ERROR_FAIL;
1013 }
1014
1015 if (status & FLASH_SR__PGAERR) {
1016 LOG_ERROR("invalid program address");
1017 retval = ERROR_FAIL;
1018 }
1019
1020 return retval;
1021 }
Open On-Chip Debugger