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stm32l4: Handle failing flash_size read like on other devices.
[openocd.git] / src / flash / nor / stm32l4x.c
blob129b281e1a5814224b0e37a9afc04049e6f167c8
1 /***************************************************************************
2 * Copyright (C) 2015 by Uwe Bonnes *
3 * bon@elektron.ikp.physik.tu-darmstadt.de *
4 *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
9 * *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
14 * *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program. If not, see <http://www.gnu.org/licenses/>. *
17 ***************************************************************************/
18
19 #ifdef HAVE_CONFIG_H
20 #include "config.h"
21 #endif
22
23 #include "imp.h"
24 #include <helper/binarybuffer.h>
25 #include <target/algorithm.h>
26 #include <target/armv7m.h>
27
28 /* STM32L4xxx series for reference.
29 *
30 * RM0351
31 * http://www.st.com/st-web-ui/static/active/en/resource/technical/document/reference_manual/DM00083560.pdf
32 *
33 * STM32L476RG Datasheet (for erase timing)
34 * http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00108832.pdf
35 *
36 *
37 * The device has normally two banks, but on 512 and 256 kiB devices an
38 * option byte is available to map all sectors to the first bank.
39 * Both STM32 banks are treated as one OpenOCD bank, as other STM32 devices
40 * handlers do!
41 *
42 */
43
44 /* Erase time can be as high as 25ms, 10x this and assume it's toast... */
45
46 #define FLASH_ERASE_TIMEOUT 250
47
48 #define STM32_FLASH_BASE 0x40022000
49 #define STM32_FLASH_ACR 0x40022000
50 #define STM32_FLASH_KEYR 0x40022008
51 #define STM32_FLASH_OPTKEYR 0x4002200c
52 #define STM32_FLASH_SR 0x40022010
53 #define STM32_FLASH_CR 0x40022014
54 #define STM32_FLASH_OPTR 0x40022020
55 #define STM32_FLASH_WRP1AR 0x4002202c
56 #define STM32_FLASH_WRP2AR 0x40022030
57 #define STM32_FLASH_WRP1BR 0x4002204c
58 #define STM32_FLASH_WRP2BR 0x40022050
59
60 /* FLASH_CR register bits */
61
62 #define FLASH_PG (1 << 0)
63 #define FLASH_PER (1 << 1)
64 #define FLASH_MER1 (1 << 2)
65 #define FLASH_PAGE_SHIFT 3
66 #define FLASH_CR_BKER (1 << 11)
67 #define FLASH_MER2 (1 << 15)
68 #define FLASH_STRT (1 << 16)
69 #define FLASH_EOPIE (1 << 24)
70 #define FLASH_ERRIE (1 << 25)
71 #define FLASH_OPTLOCK (1 << 30)
72 #define FLASH_LOCK (1 << 31)
73
74 /* FLASH_SR register bits */
75
76 #define FLASH_BSY (1 << 16)
77 /* Fast programming not used => related errors not used*/
78 #define FLASH_PGSERR (1 << 7) /* Programming sequence error */
79 #define FLASH_SIZERR (1 << 6) /* Size error */
80 #define FLASH_PGAERR (1 << 5) /* Programming alignment error */
81 #define FLASH_WRPERR (1 << 4) /* Write protection error */
82 #define FLASH_PROGERR (1 << 3) /* Programming error */
83 #define FLASH_OPERR (1 << 1) /* Operation error */
84 #define FLASH_EOP (1 << 0) /* End of operation */
85
86 #define FLASH_ERROR (FLASH_PGSERR | FLASH_PGSERR | FLASH_PGAERR | FLASH_WRPERR | FLASH_OPERR)
87
88 /* STM32_FLASH_OBR bit definitions (reading) */
89
90 #define OPT_DUALBANK 21 /* dual flash bank only */
91
92 /* register unlock keys */
93
94 #define KEY1 0x45670123
95 #define KEY2 0xCDEF89AB
96
97 /* option register unlock key */
98 #define OPTKEY1 0x08192A3B
99 #define OPTKEY2 0x4C5D6E7F
100
101
102 /* other registers */
103 #define DBGMCU_IDCODE 0xE0042000
104 #define FLASH_SIZE_REG 0x1FFF75E0
105
106 struct stm32l4_options {
107 uint8_t RDP;
108 uint16_t bank_b_start;
109 uint8_t user_options;
110 uint8_t wpr1a_start;
111 uint8_t wpr1a_end;
112 uint8_t wpr1b_start;
113 uint8_t wpr1b_end;
114 uint8_t wpr2a_start;
115 uint8_t wpr2a_end;
116 uint8_t wpr2b_start;
117 uint8_t wpr2b_end;
118 /* Fixme: Handle PCROP */
119 };
120
121 struct stm32l4_flash_bank {
122 struct stm32l4_options option_bytes;
123 int probed;
124 };
125
126 /* flash bank stm32l4x <base> <size> 0 0 <target#>
127 */
128 FLASH_BANK_COMMAND_HANDLER(stm32l4_flash_bank_command)
129 {
130 struct stm32l4_flash_bank *stm32l4_info;
131
132 if (CMD_ARGC < 6)
133 return ERROR_COMMAND_SYNTAX_ERROR;
134
135 stm32l4_info = malloc(sizeof(struct stm32l4_flash_bank));
136 if (!stm32l4_info)
137 return ERROR_FAIL; /* Checkme: What better error to use?*/
138 bank->driver_priv = stm32l4_info;
139
140 stm32l4_info->probed = 0;
141
142 return ERROR_OK;
143 }
144
145 static inline int stm32l4_get_flash_reg(struct flash_bank *bank, uint32_t reg)
146 {
147 return reg;
148 }
149
150 static inline int stm32l4_get_flash_status(struct flash_bank *bank, uint32_t *status)
151 {
152 struct target *target = bank->target;
153 return target_read_u32(
154 target, stm32l4_get_flash_reg(bank, STM32_FLASH_SR), status);
155 }
156
157 static int stm32l4_wait_status_busy(struct flash_bank *bank, int timeout)
158 {
159 struct target *target = bank->target;
160 uint32_t status;
161 int retval = ERROR_OK;
162
163 /* wait for busy to clear */
164 for (;;) {
165 retval = stm32l4_get_flash_status(bank, &status);
166 if (retval != ERROR_OK)
167 return retval;
168 LOG_DEBUG("status: 0x%" PRIx32 "", status);
169 if ((status & FLASH_BSY) == 0)
170 break;
171 if (timeout-- <= 0) {
172 LOG_ERROR("timed out waiting for flash");
173 return ERROR_FAIL;
174 }
175 alive_sleep(1);
176 }
177
178
179 if (status & FLASH_WRPERR) {
180 LOG_ERROR("stm32x device protected");
181 retval = ERROR_FAIL;
182 }
183
184 /* Clear but report errors */
185 if (status & FLASH_ERROR) {
186 /* If this operation fails, we ignore it and report the original
187 * retval
188 */
189 target_write_u32(target, stm32l4_get_flash_reg(bank, STM32_FLASH_SR),
190 status & FLASH_ERROR);
191 }
192 return retval;
193 }
194
195 static int stm32l4_unlock_reg(struct target *target)
196 {
197 uint32_t ctrl;
198
199 /* first check if not already unlocked
200 * otherwise writing on STM32_FLASH_KEYR will fail
201 */
202 int retval = target_read_u32(target, STM32_FLASH_CR, &ctrl);
203 if (retval != ERROR_OK)
204 return retval;
205
206 if ((ctrl & FLASH_LOCK) == 0)
207 return ERROR_OK;
208
209 /* unlock flash registers */
210 retval = target_write_u32(target, STM32_FLASH_KEYR, KEY1);
211 if (retval != ERROR_OK)
212 return retval;
213
214 retval = target_write_u32(target, STM32_FLASH_KEYR, KEY2);
215 if (retval != ERROR_OK)
216 return retval;
217
218 retval = target_read_u32(target, STM32_FLASH_CR, &ctrl);
219 if (retval != ERROR_OK)
220 return retval;
221
222 if (ctrl & FLASH_LOCK) {
223 LOG_ERROR("flash not unlocked STM32_FLASH_CR: %" PRIx32, ctrl);
224 return ERROR_TARGET_FAILURE;
225 }
226
227 return ERROR_OK;
228 }
229
230 static int stm32l4_unlock_option_reg(struct target *target)
231 {
232 uint32_t ctrl;
233
234 int retval = target_read_u32(target, STM32_FLASH_CR, &ctrl);
235 if (retval != ERROR_OK)
236 return retval;
237
238 if ((ctrl & FLASH_OPTLOCK) == 0)
239 return ERROR_OK;
240
241 /* unlock option registers */
242 retval = target_write_u32(target, STM32_FLASH_OPTKEYR, OPTKEY1);
243 if (retval != ERROR_OK)
244 return retval;
245
246 retval = target_write_u32(target, STM32_FLASH_OPTKEYR, OPTKEY2);
247 if (retval != ERROR_OK)
248 return retval;
249
250 retval = target_read_u32(target, STM32_FLASH_CR, &ctrl);
251 if (retval != ERROR_OK)
252 return retval;
253
254 if (ctrl & FLASH_OPTLOCK) {
255 LOG_ERROR("options not unlocked STM32_FLASH_CR: %" PRIx32, ctrl);
256 return ERROR_TARGET_FAILURE;
257 }
258
259 return ERROR_OK;
260 }
261
262 static int stm32l4_read_options(struct flash_bank *bank)
263 {
264 uint32_t optiondata;
265 struct stm32l4_flash_bank *stm32l4_info = NULL;
266 struct target *target = bank->target;
267
268 stm32l4_info = bank->driver_priv;
269
270 /* read current option bytes */
271 int retval = target_read_u32(target, STM32_FLASH_OPTR, &optiondata);
272 if (retval != ERROR_OK)
273 return retval;
274
275 stm32l4_info->option_bytes.user_options = (optiondata >> 8) & 0x3ffff;
276 stm32l4_info->option_bytes.RDP = optiondata & 0xff;
277
278 retval = target_read_u32(target, STM32_FLASH_WRP1AR, &optiondata);
279 if (retval != ERROR_OK)
280 return retval;
281 stm32l4_info->option_bytes.wpr1a_start = optiondata & 0xff;
282 stm32l4_info->option_bytes.wpr1a_end = (optiondata >> 16) & 0xff;
283
284 retval = target_read_u32(target, STM32_FLASH_WRP2AR, &optiondata);
285 if (retval != ERROR_OK)
286 return retval;
287 stm32l4_info->option_bytes.wpr2a_start = optiondata & 0xff;
288 stm32l4_info->option_bytes.wpr2a_end = (optiondata >> 16) & 0xff;
289
290 retval = target_read_u32(target, STM32_FLASH_WRP1BR, &optiondata);
291 if (retval != ERROR_OK)
292 return retval;
293 stm32l4_info->option_bytes.wpr1b_start = optiondata & 0xff;
294 stm32l4_info->option_bytes.wpr1b_end = (optiondata >> 16) & 0xff;
295
296 retval = target_read_u32(target, STM32_FLASH_WRP2BR, &optiondata);
297 if (retval != ERROR_OK)
298 return retval;
299 stm32l4_info->option_bytes.wpr2b_start = optiondata & 0xff;
300 stm32l4_info->option_bytes.wpr2b_end = (optiondata >> 16) & 0xff;
301
302 if (stm32l4_info->option_bytes.RDP != 0xAA)
303 LOG_INFO("Device Security Bit Set");
304
305 return ERROR_OK;
306 }
307
308 static int stm32l4_write_options(struct flash_bank *bank)
309 {
310 struct stm32l4_flash_bank *stm32l4_info = NULL;
311 struct target *target = bank->target;
312 uint32_t optiondata;
313
314 stm32l4_info = bank->driver_priv;
315
316 (void) optiondata;
317 (void) stm32l4_info;
318
319 int retval = stm32l4_unlock_option_reg(target);
320 if (retval != ERROR_OK)
321 return retval;
322 /* FIXME: Implement Option writing!*/
323 return ERROR_OK;
324 }
325
326 static int stm32l4_protect_check(struct flash_bank *bank)
327 {
328 struct stm32l4_flash_bank *stm32l4_info = bank->driver_priv;
329
330 /* read write protection settings */
331 int retval = stm32l4_read_options(bank);
332 if (retval != ERROR_OK) {
333 LOG_DEBUG("unable to read option bytes");
334 return retval;
335 }
336
337 for (int i = 0; i < bank->num_sectors; i++) {
338 if (i < stm32l4_info->option_bytes.bank_b_start) {
339 if (((i >= stm32l4_info->option_bytes.wpr1a_start) &&
340 (i <= stm32l4_info->option_bytes.wpr1a_end)) ||
341 ((i >= stm32l4_info->option_bytes.wpr2a_start) &&
342 (i <= stm32l4_info->option_bytes.wpr2a_end)))
343 bank->sectors[i].is_protected = 1;
344 else
345 bank->sectors[i].is_protected = 0;
346 } else {
347 uint8_t snb;
348 snb = i - stm32l4_info->option_bytes.bank_b_start + 256;
349 if (((snb >= stm32l4_info->option_bytes.wpr1b_start) &&
350 (snb <= stm32l4_info->option_bytes.wpr1b_end)) ||
351 ((snb >= stm32l4_info->option_bytes.wpr2b_start) &&
352 (snb <= stm32l4_info->option_bytes.wpr2b_end)))
353 bank->sectors[i].is_protected = 1;
354 else
355 bank->sectors[i].is_protected = 0;
356 }
357 }
358 return ERROR_OK;
359 }
360
361 static int stm32l4_erase(struct flash_bank *bank, int first, int last)
362 {
363 struct target *target = bank->target;
364 int i;
365
366 assert(first < bank->num_sectors);
367 assert(last < bank->num_sectors);
368
369 if (bank->target->state != TARGET_HALTED) {
370 LOG_ERROR("Target not halted");
371 return ERROR_TARGET_NOT_HALTED;
372 }
373
374 int retval;
375 retval = stm32l4_unlock_reg(target);
376 if (retval != ERROR_OK)
377 return retval;
378
379 /*
380 Sector Erase
381 To erase a sector, follow the procedure below:
382 1. Check that no Flash memory operation is ongoing by
383 checking the BSY bit in the FLASH_SR register
384 2. Set the PER bit and select the page and bank
385 you wish to erase in the FLASH_CR register
386 3. Set the STRT bit in the FLASH_CR register
387 4. Wait for the BSY bit to be cleared
388 */
389 struct stm32l4_flash_bank *stm32l4_info = bank->driver_priv;
390
391 for (i = first; i <= last; i++) {
392 uint32_t erase_flags;
393 erase_flags = FLASH_PER | FLASH_STRT;
394
395 if (i >= stm32l4_info->option_bytes.bank_b_start) {
396 uint8_t snb;
397 snb = (i - stm32l4_info->option_bytes.bank_b_start) + 256;
398 erase_flags |= snb << FLASH_PAGE_SHIFT | FLASH_CR_BKER;
399 } else
400 erase_flags |= i << FLASH_PAGE_SHIFT;
401 retval = target_write_u32(target,
402 stm32l4_get_flash_reg(bank, STM32_FLASH_CR), erase_flags);
403 if (retval != ERROR_OK)
404 return retval;
405
406 retval = stm32l4_wait_status_busy(bank, FLASH_ERASE_TIMEOUT);
407 if (retval != ERROR_OK)
408 return retval;
409
410 bank->sectors[i].is_erased = 1;
411 }
412
413 retval = target_write_u32(
414 target, stm32l4_get_flash_reg(bank, STM32_FLASH_CR), FLASH_LOCK);
415 if (retval != ERROR_OK)
416 return retval;
417
418 return ERROR_OK;
419 }
420
421 static int stm32l4_protect(struct flash_bank *bank, int set, int first, int last)
422 {
423 struct target *target = bank->target;
424 struct stm32l4_flash_bank *stm32l4_info = bank->driver_priv;
425
426 if (target->state != TARGET_HALTED) {
427 LOG_ERROR("Target not halted");
428 return ERROR_TARGET_NOT_HALTED;
429 }
430
431 /* read protection settings */
432 int retval = stm32l4_read_options(bank);
433 if (retval != ERROR_OK) {
434 LOG_DEBUG("unable to read option bytes");
435 return retval;
436 }
437
438 (void)stm32l4_info;
439 /* FIXME: Write First and last in a valid WRPxx_start/end combo*/
440 retval = stm32l4_write_options(bank);
441 if (retval != ERROR_OK)
442 return retval;
443
444 return ERROR_OK;
445 }
446
447 /* Count is in halfwords */
448 static int stm32l4_write_block(struct flash_bank *bank, const uint8_t *buffer,
449 uint32_t offset, uint32_t count)
450 {
451 struct target *target = bank->target;
452 uint32_t buffer_size = 16384;
453 struct working_area *write_algorithm;
454 struct working_area *source;
455 uint32_t address = bank->base + offset;
456 struct reg_param reg_params[5];
457 struct armv7m_algorithm armv7m_info;
458 int retval = ERROR_OK;
459
460 /* See contrib/loaders/flash/stm32l4x.S for source and
461 * hints how to generate the data!
462 */
463
464 static const uint8_t stm32l4_flash_write_code[] = {
465 0xd0, 0xf8, 0x00, 0x80, 0xb8, 0xf1, 0x00, 0x0f, 0x21, 0xd0, 0x45, 0x68,
466 0xb8, 0xeb, 0x05, 0x06, 0x44, 0xbf, 0x76, 0x18, 0x36, 0x1a, 0x08, 0x2e,
467 0xf2, 0xd3, 0xdf, 0xf8, 0x36, 0x60, 0x66, 0x61, 0xf5, 0xe8, 0x02, 0x67,
468 0xe2, 0xe8, 0x02, 0x67, 0xbf, 0xf3, 0x4f, 0x8f, 0x26, 0x69, 0x16, 0xf4,
469 0x80, 0x3f, 0xfb, 0xd1, 0x16, 0xf0, 0xfa, 0x0f, 0x07, 0xd1, 0x8d, 0x42,
470 0x28, 0xbf, 0x00, 0xf1, 0x08, 0x05, 0x45, 0x60, 0x01, 0x3b, 0x13, 0xb1,
471 0xda, 0xe7, 0x00, 0x21, 0x41, 0x60, 0x30, 0x46, 0x00, 0xbe, 0x01, 0x00,
472 0x00, 0x00
473 };
474
475 if (target_alloc_working_area(target, sizeof(stm32l4_flash_write_code),
476 &write_algorithm) != ERROR_OK) {
477 LOG_WARNING("no working area available, can't do block memory writes");
478 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
479 }
480
481 retval = target_write_buffer(target, write_algorithm->address,
482 sizeof(stm32l4_flash_write_code),
483 stm32l4_flash_write_code);
484 if (retval != ERROR_OK)
485 return retval;
486
487 /* memory buffer */
488 while (target_alloc_working_area_try(target, buffer_size, &source) !=
489 ERROR_OK) {
490 buffer_size /= 2;
491 if (buffer_size <= 256) {
492 /* we already allocated the writing code, but failed to get a
493 * buffer, free the algorithm */
494 target_free_working_area(target, write_algorithm);
495
496 LOG_WARNING("no large enough working area available, can't do block memory writes");
497 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
498 }
499 }
500
501 armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
502 armv7m_info.core_mode = ARM_MODE_THREAD;
503
504 init_reg_param(&reg_params[0], "r0", 32, PARAM_IN_OUT); /* buffer start, status (out) */
505 init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT); /* buffer end */
506 init_reg_param(&reg_params[2], "r2", 32, PARAM_OUT); /* target address */
507 init_reg_param(&reg_params[3], "r3", 32, PARAM_OUT); /* count (double word-64bit) */
508 init_reg_param(&reg_params[4], "r4", 32, PARAM_OUT); /* flash base */
509
510 buf_set_u32(reg_params[0].value, 0, 32, source->address);
511 buf_set_u32(reg_params[1].value, 0, 32, source->address + source->size);
512 buf_set_u32(reg_params[2].value, 0, 32, address);
513 buf_set_u32(reg_params[3].value, 0, 32, count / 4);
514 buf_set_u32(reg_params[4].value, 0, 32, STM32_FLASH_BASE);
515
516 retval = target_run_flash_async_algorithm(target, buffer, count, 2,
517 0, NULL,
518 5, reg_params,
519 source->address, source->size,
520 write_algorithm->address, 0,
521 &armv7m_info);
522
523 if (retval == ERROR_FLASH_OPERATION_FAILED) {
524 LOG_ERROR("error executing stm32l4 flash write algorithm");
525
526 uint32_t error = buf_get_u32(reg_params[0].value, 0, 32) & FLASH_ERROR;
527
528 if (error & FLASH_WRPERR)
529 LOG_ERROR("flash memory write protected");
530
531 if (error != 0) {
532 LOG_ERROR("flash write failed = %08" PRIx32, error);
533 /* Clear but report errors */
534 target_write_u32(target, STM32_FLASH_SR, error);
535 retval = ERROR_FAIL;
536 }
537 }
538
539 target_free_working_area(target, source);
540 target_free_working_area(target, write_algorithm);
541
542 destroy_reg_param(&reg_params[0]);
543 destroy_reg_param(&reg_params[1]);
544 destroy_reg_param(&reg_params[2]);
545 destroy_reg_param(&reg_params[3]);
546 destroy_reg_param(&reg_params[4]);
547
548 return retval;
549 }
550
551 static int stm32l4_write(struct flash_bank *bank, const uint8_t *buffer,
552 uint32_t offset, uint32_t count)
553 {
554 struct target *target = bank->target;
555 int retval;
556
557 if (bank->target->state != TARGET_HALTED) {
558 LOG_ERROR("Target not halted");
559 return ERROR_TARGET_NOT_HALTED;
560 }
561
562 if (offset & 0x7) {
563 LOG_WARNING("offset 0x%" PRIx32 " breaks required 8-byte alignment",
564 offset);
565 return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
566 }
567
568 if (count & 0x7) {
569 LOG_WARNING("Padding %d bytes to keep 8-byte write size",
570 count & 7);
571 count = (count + 7) & ~7;
572 /* This pads the write chunk with random bytes by overrunning the
573 * write buffer. Padding with the erased pattern 0xff is purely
574 * cosmetical, as 8-byte flash words are ECC secured and the first
575 * write will program the ECC bits. A second write would need
576 * to reprogramm these ECC bits.
577 * But this can only be done after erase!
578 */
579 }
580
581 retval = stm32l4_unlock_reg(target);
582 if (retval != ERROR_OK)
583 return retval;
584
585 /* Only full double words (8-byte) can be programmed*/
586 retval = stm32l4_write_block(bank, buffer, offset, count / 2);
587 if (retval != ERROR_OK) {
588 LOG_WARNING("block write failed");
589 return retval;
590 }
591
592 LOG_WARNING("block write succeeded");
593 return target_write_u32(target, STM32_FLASH_CR, FLASH_LOCK);
594 }
595
596 static int stm32l4_probe(struct flash_bank *bank)
597 {
598 struct target *target = bank->target;
599 struct stm32l4_flash_bank *stm32l4_info = bank->driver_priv;
600 int i;
601 uint16_t flash_size_in_kb = 0xffff;
602 uint16_t max_flash_size_in_kb;
603 uint32_t device_id;
604 uint32_t options;
605 uint32_t base_address = 0x08000000;
606
607 stm32l4_info->probed = 0;
608
609 /* read stm32 device id register */
610 int retval = target_read_u32(target, DBGMCU_IDCODE, &device_id);
611 if (retval != ERROR_OK)
612 return retval;
613 LOG_INFO("device id = 0x%08" PRIx32 "", device_id);
614
615 /* set max flash size depending on family */
616 switch (device_id & 0xfff) {
617 case 0x415:
618 max_flash_size_in_kb = 1024;
619 break;
620 default:
621 LOG_WARNING("Cannot identify target as a STM32L4 family.");
622 return ERROR_FAIL;
623 }
624
625 /* get flash size from target. */
626 retval = target_read_u16(target, FLASH_SIZE_REG, &flash_size_in_kb);
627
628 /* failed reading flash size or flash size invalid (early silicon),
629 * default to max target family */
630 if (retval != ERROR_OK || flash_size_in_kb == 0xffff || flash_size_in_kb == 0) {
631 LOG_WARNING("STM32 flash size failed, probe inaccurate - assuming %dk flash",
632 max_flash_size_in_kb);
633 flash_size_in_kb = max_flash_size_in_kb;
634 }
635
636 LOG_INFO("flash size = %dkbytes", flash_size_in_kb);
637
638 /* did we assign flash size? */
639 assert(flash_size_in_kb != 0xffff);
640
641 /* get options to for DUAL BANK. */
642 retval = target_read_u32(target, STM32_FLASH_OPTR, &options);
643
644 /* only devices with < 1024 kiB may be set to single bank dual banks */
645 if ((flash_size_in_kb == 1024) || !(options & OPT_DUALBANK))
646 stm32l4_info->option_bytes.bank_b_start = 256;
647 else
648 stm32l4_info->option_bytes.bank_b_start = flash_size_in_kb << 9;
649
650 /* did we assign flash size? */
651 assert((flash_size_in_kb != 0xffff) && flash_size_in_kb);
652
653 /* calculate numbers of pages */
654 int num_pages = flash_size_in_kb / 2;
655
656 /* check that calculation result makes sense */
657 assert(num_pages > 0);
658
659 if (bank->sectors) {
660 free(bank->sectors);
661 bank->sectors = NULL;
662 }
663
664 bank->base = base_address;
665 bank->size = num_pages * (1 << 11);
666 bank->num_sectors = num_pages;
667 bank->sectors = malloc(sizeof(struct flash_sector) * num_pages);
668 if (!bank->sectors)
669 return ERROR_FAIL; /* Checkme: What better error to use?*/
670
671 for (i = 0; i < num_pages; i++) {
672 bank->sectors[i].offset = i << 11;
673 bank->sectors[i].size = 1 << 11;
674 bank->sectors[i].is_erased = -1;
675 bank->sectors[i].is_protected = 1;
676 }
677
678 stm32l4_info->probed = 1;
679
680 return ERROR_OK;
681 }
682
683 static int stm32l4_auto_probe(struct flash_bank *bank)
684 {
685 struct stm32l4_flash_bank *stm32l4_info = bank->driver_priv;
686 if (stm32l4_info->probed)
687 return ERROR_OK;
688 return stm32l4_probe(bank);
689 }
690
691 static int get_stm32l4_info(struct flash_bank *bank, char *buf, int buf_size)
692 {
693 struct target *target = bank->target;
694 uint32_t dbgmcu_idcode;
695
696 /* read stm32 device id register */
697 int retval = target_read_u32(target, DBGMCU_IDCODE, &dbgmcu_idcode);
698 if (retval != ERROR_OK)
699 return retval;
700
701 uint16_t device_id = dbgmcu_idcode & 0xffff;
702 uint8_t rev_id = dbgmcu_idcode >> 28;
703 uint8_t rev_minor = 0;
704 int i;
705
706 for (i = 16; i < 28; i++) {
707 if (dbgmcu_idcode & (1 << i))
708 rev_minor++;
709 else
710 break;
711 }
712
713 const char *device_str;
714
715 switch (device_id) {
716 case 0x6415:
717 device_str = "STM32L4xx";
718 break;
719
720 default:
721 snprintf(buf, buf_size, "Cannot identify target as a STM32L4\n");
722 return ERROR_FAIL;
723 }
724
725 snprintf(buf, buf_size, "%s - Rev: %1d.%02d",
726 device_str, rev_id, rev_minor);
727
728 return ERROR_OK;
729 }
730
731 COMMAND_HANDLER(stm32l4_handle_lock_command)
732 {
733 struct target *target = NULL;
734 struct stm32l4_flash_bank *stm32l4_info = NULL;
735
736 if (CMD_ARGC < 1)
737 return ERROR_COMMAND_SYNTAX_ERROR;
738
739 struct flash_bank *bank;
740 int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
741 if (ERROR_OK != retval)
742 return retval;
743
744 stm32l4_info = bank->driver_priv;
745 target = bank->target;
746
747 if (target->state != TARGET_HALTED) {
748 LOG_ERROR("Target not halted");
749 return ERROR_TARGET_NOT_HALTED;
750 }
751
752 if (stm32l4_read_options(bank) != ERROR_OK) {
753 command_print(CMD_CTX, "%s failed to read options",
754 bank->driver->name);
755 return ERROR_OK;
756 }
757
758 /* set readout protection */
759 stm32l4_info->option_bytes.RDP = 0;
760
761 if (stm32l4_write_options(bank) != ERROR_OK) {
762 command_print(CMD_CTX, "%s failed to lock device", bank->driver->name);
763 return ERROR_OK;
764 }
765
766 command_print(CMD_CTX, "%s locked", bank->driver->name);
767
768 return ERROR_OK;
769 }
770
771 COMMAND_HANDLER(stm32l4_handle_unlock_command)
772 {
773 struct target *target = NULL;
774 struct stm32l4_flash_bank *stm32l4_info = NULL;
775
776 if (CMD_ARGC < 1)
777 return ERROR_COMMAND_SYNTAX_ERROR;
778
779 struct flash_bank *bank;
780 int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
781 if (ERROR_OK != retval)
782 return retval;
783
784 stm32l4_info = bank->driver_priv;
785 target = bank->target;
786
787 if (target->state != TARGET_HALTED) {
788 LOG_ERROR("Target not halted");
789 return ERROR_TARGET_NOT_HALTED;
790 }
791
792 if (stm32l4_read_options(bank) != ERROR_OK) {
793 command_print(CMD_CTX, "%s failed to read options", bank->driver->name);
794 return ERROR_OK;
795 }
796
797 /* clear readout protection and complementary option bytes
798 * this will also force a device unlock if set */
799 stm32l4_info->option_bytes.RDP = 0xAA;
800
801 if (stm32l4_write_options(bank) != ERROR_OK) {
802 command_print(CMD_CTX, "%s failed to unlock device",
803 bank->driver->name);
804 return ERROR_OK;
805 }
806
807 command_print(CMD_CTX, "%s unlocked.\n"
808 "INFO: a reset or power cycle is required "
809 "for the new settings to take effect.", bank->driver->name);
810
811 return ERROR_OK;
812 }
813
814 static int stm32l4_mass_erase(struct flash_bank *bank, uint32_t action)
815 {
816 int retval;
817 struct target *target = bank->target;
818
819 if (target->state != TARGET_HALTED) {
820 LOG_ERROR("Target not halted");
821 return ERROR_TARGET_NOT_HALTED;
822 }
823
824 retval = stm32l4_unlock_reg(target);
825 if (retval != ERROR_OK)
826 return retval;
827
828 /* mass erase flash memory */
829 retval = target_write_u32(
830 target, stm32l4_get_flash_reg(bank, STM32_FLASH_CR), action);
831 if (retval != ERROR_OK)
832 return retval;
833 retval = target_write_u32(
834 target, stm32l4_get_flash_reg(bank, STM32_FLASH_CR),
835 action | FLASH_STRT);
836 if (retval != ERROR_OK)
837 return retval;
838
839 retval = stm32l4_wait_status_busy(bank, FLASH_ERASE_TIMEOUT);
840 if (retval != ERROR_OK)
841 return retval;
842
843 retval = target_write_u32(
844 target, stm32l4_get_flash_reg(bank, STM32_FLASH_CR), FLASH_LOCK);
845 if (retval != ERROR_OK)
846 return retval;
847
848 return ERROR_OK;
849 }
850
851 COMMAND_HANDLER(stm32l4_handle_mass_erase_command)
852 {
853 int i;
854 uint32_t action;
855
856 if (CMD_ARGC < 1) {
857 command_print(CMD_CTX, "stm32x mass_erase <STM32L4 bank>");
858 return ERROR_COMMAND_SYNTAX_ERROR;
859 }
860
861 struct flash_bank *bank;
862 int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
863 if (ERROR_OK != retval)
864 return retval;
865
866 action = FLASH_MER1 | FLASH_MER2;
867 retval = stm32l4_mass_erase(bank, action);
868 if (retval == ERROR_OK) {
869 /* set all sectors as erased */
870 for (i = 0; i < bank->num_sectors; i++)
871 bank->sectors[i].is_erased = 1;
872
873 command_print(CMD_CTX, "stm32x mass erase complete");
874 } else {
875 command_print(CMD_CTX, "stm32x mass erase failed");
876 }
877
878 return retval;
879 }
880
881 static const struct command_registration stm32l4_exec_command_handlers[] = {
882 {
883 .name = "lock",
884 .handler = stm32l4_handle_lock_command,
885 .mode = COMMAND_EXEC,
886 .usage = "bank_id",
887 .help = "Lock entire flash device.",
888 },
889 {
890 .name = "unlock",
891 .handler = stm32l4_handle_unlock_command,
892 .mode = COMMAND_EXEC,
893 .usage = "bank_id",
894 .help = "Unlock entire protected flash device.",
895 },
896 {
897 .name = "mass_erase",
898 .handler = stm32l4_handle_mass_erase_command,
899 .mode = COMMAND_EXEC,
900 .usage = "bank_id",
901 .help = "Erase entire flash device.",
902 },
903 COMMAND_REGISTRATION_DONE
904 };
905
906 static const struct command_registration stm32l4_command_handlers[] = {
907 {
908 .name = "stm32l4x",
909 .mode = COMMAND_ANY,
910 .help = "stm32l4x flash command group",
911 .usage = "",
912 .chain = stm32l4_exec_command_handlers,
913 },
914 COMMAND_REGISTRATION_DONE
915 };
916
917 struct flash_driver stm32l4x_flash = {
918 .name = "stm32l4x",
919 .commands = stm32l4_command_handlers,
920 .flash_bank_command = stm32l4_flash_bank_command,
921 .erase = stm32l4_erase,
922 .protect = stm32l4_protect,
923 .write = stm32l4_write,
924 .read = default_flash_read,
925 .probe = stm32l4_probe,
926 .auto_probe = stm32l4_auto_probe,
927 .erase_check = default_flash_blank_check,
928 .protect_check = stm32l4_protect_check,
929 .info = get_stm32l4_info,
930 };
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