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   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, see <http://www.gnu.org/licenses/>. *
  23  ***************************************************************************/
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include "imp.h"
  30 #include <helper/binarybuffer.h>
  31 #include <target/algorithm.h>
  32 #include <target/armv7m.h>
  33 #include <target/cortex_m.h>
  34
  35 /* stm32lx flash register locations */
  36
  37 #define FLASH_ACR               0x00
  38 #define FLASH_PECR              0x04
  39 #define FLASH_PDKEYR    0x08
  40 #define FLASH_PEKEYR    0x0C
  41 #define FLASH_PRGKEYR   0x10
  42 #define FLASH_OPTKEYR   0x14
  43 #define FLASH_SR                0x18
  44 #define FLASH_OBR               0x1C
  45 #define FLASH_WRPR              0x20
  46
  47 /* FLASH_ACR bites */
  48 #define FLASH_ACR__LATENCY              (1<<0)
  49 #define FLASH_ACR__PRFTEN               (1<<1)
  50 #define FLASH_ACR__ACC64                (1<<2)
  51 #define FLASH_ACR__SLEEP_PD             (1<<3)
  52 #define FLASH_ACR__RUN_PD               (1<<4)
  53
  54 /* FLASH_PECR bits */
  55 #define FLASH_PECR__PELOCK              (1<<0)
  56 #define FLASH_PECR__PRGLOCK             (1<<1)
  57 #define FLASH_PECR__OPTLOCK             (1<<2)
  58 #define FLASH_PECR__PROG                (1<<3)
  59 #define FLASH_PECR__DATA                (1<<4)
  60 #define FLASH_PECR__FTDW                (1<<8)
  61 #define FLASH_PECR__ERASE               (1<<9)
  62 #define FLASH_PECR__FPRG                (1<<10)
  63 #define FLASH_PECR__EOPIE               (1<<16)
  64 #define FLASH_PECR__ERRIE               (1<<17)
  65 #define FLASH_PECR__OBL_LAUNCH  (1<<18)
  66
  67 /* FLASH_SR bits */
  68 #define FLASH_SR__BSY           (1<<0)
  69 #define FLASH_SR__EOP           (1<<1)
  70 #define FLASH_SR__ENDHV         (1<<2)
  71 #define FLASH_SR__READY         (1<<3)
  72 #define FLASH_SR__WRPERR        (1<<8)
  73 #define FLASH_SR__PGAERR        (1<<9)
  74 #define FLASH_SR__SIZERR        (1<<10)
  75 #define FLASH_SR__OPTVERR       (1<<11)
  76
  77 /* Unlock keys */
  78 #define PEKEY1                  0x89ABCDEF
  79 #define PEKEY2                  0x02030405
  80 #define PRGKEY1                 0x8C9DAEBF
  81 #define PRGKEY2                 0x13141516
  82 #define OPTKEY1                 0xFBEAD9C8
  83 #define OPTKEY2                 0x24252627
  84
  85 /* other registers */
  86 #define DBGMCU_IDCODE           0xE0042000
  87 #define DBGMCU_IDCODE_L0        0x40015800
  88
  89 /* Constants */
  90 #define FLASH_SECTOR_SIZE 4096
  91 #define FLASH_BANK0_ADDRESS 0x08000000
  92
  93 /* option bytes */
  94 #define OPTION_BYTES_ADDRESS 0x1FF80000
  95
  96 #define OPTION_BYTE_0_PR1 0xFFFF0000
  97 #define OPTION_BYTE_0_PR0 0xFF5500AA
  98
  99 static int stm32lx_unlock_program_memory(struct flash_bank *bank);
 100 static int stm32lx_lock_program_memory(struct flash_bank *bank);
 101 static int stm32lx_enable_write_half_page(struct flash_bank *bank);
 102 static int stm32lx_erase_sector(struct flash_bank *bank, int sector);
 103 static int stm32lx_wait_until_bsy_clear(struct flash_bank *bank);
 104 static int stm32lx_lock(struct flash_bank *bank);
 105 static int stm32lx_unlock(struct flash_bank *bank);
 106 static int stm32lx_mass_erase(struct flash_bank *bank);
 107 static int stm32lx_wait_until_bsy_clear_timeout(struct flash_bank *bank, int timeout);
 108 static int stm32lx_update_part_info(struct flash_bank *bank, uint16_t flash_size_in_kb);
 109
 110 struct stm32lx_rev {
 111         uint16_t rev;
 112         const char *str;
 113 };
 114
 115 struct stm32lx_part_info {
 116         uint16_t id;
 117         const char *device_str;
 118         const struct stm32lx_rev *revs;
 119         size_t num_revs;
 120         unsigned int page_size;
 121         unsigned int pages_per_sector;
 122         uint16_t max_flash_size_kb;
 123         uint16_t first_bank_size_kb; /* used when has_dual_banks is true */
 124         bool has_dual_banks;
 125
 126         uint32_t flash_base;    /* Flash controller registers location */
 127         uint32_t fsize_base;    /* Location of FSIZE register */
 128 };
 129
 130 struct stm32lx_flash_bank {
 131         int probed;
 132         uint32_t idcode;
 133         uint32_t user_bank_size;
 134         uint32_t flash_base;
 135
 136         struct stm32lx_part_info part_info;
 137 };
 138
 139 static const struct stm32lx_rev stm32_416_revs[] = {
 140         { 0x1000, "A" }, { 0x1008, "Y" }, { 0x1038, "W" }, { 0x1078, "V" },
 141 };
 142 static const struct stm32lx_rev stm32_417_revs[] = {
 143         { 0x1000, "A" }, { 0x1008, "Z" }, { 0x1018, "Y" }, { 0x1038, "X" }
 144 };
 145 static const struct stm32lx_rev stm32_425_revs[] = {
 146         { 0x1000, "A" }, { 0x2000, "B" }, { 0x2008, "Y" },
 147 };
 148 static const struct stm32lx_rev stm32_427_revs[] = {
 149         { 0x1000, "A" }, { 0x1018, "Y" }, { 0x1038, "X" }, { 0x10f8, "V" },
 150 };
 151 static const struct stm32lx_rev stm32_429_revs[] = {
 152         { 0x1000, "A" }, { 0x1018, "Z" },
 153 };
 154 static const struct stm32lx_rev stm32_436_revs[] = {
 155         { 0x1000, "A" }, { 0x1008, "Z" }, { 0x1018, "Y" },
 156 };
 157 static const struct stm32lx_rev stm32_437_revs[] = {
 158         { 0x1000, "A" },
 159 };
 160 static const struct stm32lx_rev stm32_447_revs[] = {
 161         { 0x1000, "A" }, { 0x2000, "B" }, { 0x2008, "Z" },
 162 };
 163 static const struct stm32lx_rev stm32_457_revs[] = {
 164         { 0x1000, "A" }, { 0x1008, "Z" },
 165 };
 166
 167 static const struct stm32lx_part_info stm32lx_parts[] = {
 168         {
 169                 .id                                     = 0x416,
 170                 .revs                           = stm32_416_revs,
 171                 .num_revs                       = ARRAY_SIZE(stm32_416_revs),
 172                 .device_str                     = "STM32L1xx (Cat.1 - Low/Medium Density)",
 173                 .page_size                      = 256,
 174                 .pages_per_sector       = 16,
 175                 .max_flash_size_kb      = 128,
 176                 .has_dual_banks         = false,
 177                 .flash_base                     = 0x40023C00,
 178                 .fsize_base                     = 0x1FF8004C,
 179         },
 180         {
 181                 .id                                     = 0x417,
 182                 .revs                           = stm32_417_revs,
 183                 .num_revs                       = ARRAY_SIZE(stm32_417_revs),
 184                 .device_str                     = "STM32L0xx (Cat. 3)",
 185                 .page_size                      = 128,
 186                 .pages_per_sector       = 32,
 187                 .max_flash_size_kb      = 64,
 188                 .has_dual_banks         = false,
 189                 .flash_base                     = 0x40022000,
 190                 .fsize_base                     = 0x1FF8007C,
 191         },
 192         {
 193                 .id                                     = 0x425,
 194                 .revs                           = stm32_425_revs,
 195                 .num_revs                       = ARRAY_SIZE(stm32_425_revs),
 196                 .device_str                     = "STM32L0xx (Cat. 2)",
 197                 .page_size                      = 128,
 198                 .pages_per_sector       = 32,
 199                 .max_flash_size_kb      = 32,
 200                 .has_dual_banks         = false,
 201                 .flash_base                     = 0x40022000,
 202                 .fsize_base                     = 0x1FF8007C,
 203         },
 204         {
 205                 .id                                     = 0x427,
 206                 .revs                           = stm32_427_revs,
 207                 .num_revs                       = ARRAY_SIZE(stm32_427_revs),
 208                 .device_str                     = "STM32L1xx (Cat.3 - Medium+ Density)",
 209                 .page_size                      = 256,
 210                 .pages_per_sector       = 16,
 211                 .max_flash_size_kb      = 256,
 212                 .has_dual_banks         = false,
 213                 .flash_base                     = 0x40023C00,
 214                 .fsize_base                     = 0x1FF800CC,
 215         },
 216         {
 217                 .id                                     = 0x429,
 218                 .revs                           = stm32_429_revs,
 219                 .num_revs                       = ARRAY_SIZE(stm32_429_revs),
 220                 .device_str                     = "STM32L1xx (Cat.2)",
 221                 .page_size                      = 256,
 222                 .pages_per_sector       = 16,
 223                 .max_flash_size_kb      = 128,
 224                 .has_dual_banks         = false,
 225                 .flash_base                     = 0x40023C00,
 226                 .fsize_base                     = 0x1FF8004C,
 227         },
 228         {
 229                 .id                                     = 0x436,
 230                 .revs                           = stm32_436_revs,
 231                 .num_revs                       = ARRAY_SIZE(stm32_436_revs),
 232                 .device_str                     = "STM32L1xx (Cat.4/Cat.3 - Medium+/High Density)",
 233                 .page_size                      = 256,
 234                 .pages_per_sector       = 16,
 235                 .max_flash_size_kb      = 384,
 236                 .first_bank_size_kb     = 192,
 237                 .has_dual_banks         = true,
 238                 .flash_base                     = 0x40023C00,
 239                 .fsize_base                     = 0x1FF800CC,
 240         },
 241         {
 242                 .id                                     = 0x437,
 243                 .revs                           = stm32_437_revs,
 244                 .num_revs                       = ARRAY_SIZE(stm32_437_revs),
 245                 .device_str                     = "STM32L1xx (Cat.5/Cat.6)",
 246                 .page_size                      = 256,
 247                 .pages_per_sector       = 16,
 248                 .max_flash_size_kb      = 512,
 249                 .first_bank_size_kb     = 0,            /* determined in runtime */
 250                 .has_dual_banks         = true,
 251                 .flash_base                     = 0x40023C00,
 252                 .fsize_base                     = 0x1FF800CC,
 253         },
 254         {
 255                 .id                                     = 0x447,
 256                 .revs                           = stm32_447_revs,
 257                 .num_revs                       = ARRAY_SIZE(stm32_447_revs),
 258                 .device_str                     = "STM32L0xx (Cat.5)",
 259                 .page_size                      = 128,
 260                 .pages_per_sector       = 32,
 261                 .max_flash_size_kb      = 192,
 262                 .first_bank_size_kb     = 0,            /* determined in runtime */
 263                 .has_dual_banks         = false,        /* determined in runtime */
 264                 .flash_base                     = 0x40022000,
 265                 .fsize_base                     = 0x1FF8007C,
 266         },
 267         {
 268                 .id                                     = 0x457,
 269                 .revs                           = stm32_457_revs,
 270                 .num_revs                       = ARRAY_SIZE(stm32_457_revs),
 271                 .device_str                     = "STM32L0xx (Cat.1)",
 272                 .page_size                      = 128,
 273                 .pages_per_sector       = 32,
 274                 .max_flash_size_kb      = 16,
 275                 .has_dual_banks         = false,
 276                 .flash_base                     = 0x40022000,
 277                 .fsize_base                     = 0x1FF8007C,
 278         },
 279 };
 280
 281 /* flash bank stm32lx <base> <size> 0 0 <target#>
 282  */
 283 FLASH_BANK_COMMAND_HANDLER(stm32lx_flash_bank_command)
 284 {
 285         struct stm32lx_flash_bank *stm32lx_info;
 286         if (CMD_ARGC < 6)
 287                 return ERROR_COMMAND_SYNTAX_ERROR;
 288
 289         /* Create the bank structure */
 290         stm32lx_info = calloc(1, sizeof(*stm32lx_info));
 291
 292         /* Check allocation */
 293         if (stm32lx_info == NULL) {
 294                 LOG_ERROR("failed to allocate bank structure");
 295                 return ERROR_FAIL;
 296         }
 297
 298         bank->driver_priv = stm32lx_info;
 299
 300         stm32lx_info->probed = 0;
 301         stm32lx_info->user_bank_size = bank->size;
 302
 303         /* the stm32l erased value is 0x00 */
 304         bank->default_padded_value = bank->erased_value = 0x00;
 305
 306         return ERROR_OK;
 307 }
 308
 309 COMMAND_HANDLER(stm32lx_handle_mass_erase_command)
 310 {
 311         int i;
 312
 313         if (CMD_ARGC < 1)
 314                 return ERROR_COMMAND_SYNTAX_ERROR;
 315
 316         struct flash_bank *bank;
 317         int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
 318         if (ERROR_OK != retval)
 319                 return retval;
 320
 321         retval = stm32lx_mass_erase(bank);
 322         if (retval == ERROR_OK) {
 323                 /* set all sectors as erased */
 324                 for (i = 0; i < bank->num_sectors; i++)
 325                         bank->sectors[i].is_erased = 1;
 326
 327                 command_print(CMD_CTX, "stm32lx mass erase complete");
 328         } else {
 329                 command_print(CMD_CTX, "stm32lx mass erase failed");
 330         }
 331
 332         return retval;
 333 }
 334
 335 COMMAND_HANDLER(stm32lx_handle_lock_command)
 336 {
 337         if (CMD_ARGC < 1)
 338                 return ERROR_COMMAND_SYNTAX_ERROR;
 339
 340         struct flash_bank *bank;
 341         int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
 342         if (ERROR_OK != retval)
 343                 return retval;
 344
 345         retval = stm32lx_lock(bank);
 346
 347         if (retval == ERROR_OK)
 348                 command_print(CMD_CTX, "STM32Lx locked, takes effect after power cycle.");
 349         else
 350                 command_print(CMD_CTX, "STM32Lx lock failed");
 351
 352         return retval;
 353 }
 354
 355 COMMAND_HANDLER(stm32lx_handle_unlock_command)
 356 {
 357         if (CMD_ARGC < 1)
 358                 return ERROR_COMMAND_SYNTAX_ERROR;
 359
 360         struct flash_bank *bank;
 361         int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
 362         if (ERROR_OK != retval)
 363                 return retval;
 364
 365         retval = stm32lx_unlock(bank);
 366
 367         if (retval == ERROR_OK)
 368                 command_print(CMD_CTX, "STM32Lx unlocked, takes effect after power cycle.");
 369         else
 370                 command_print(CMD_CTX, "STM32Lx unlock failed");
 371
 372         return retval;
 373 }
 374
 375 static int stm32lx_protect_check(struct flash_bank *bank)
 376 {
 377         int retval;
 378         struct target *target = bank->target;
 379         struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
 380
 381         uint32_t wrpr;
 382
 383         /*
 384          * Read the WRPR word, and check each bit (corresponding to each
 385          * flash sector
 386          */
 387         retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_WRPR,
 388                         &wrpr);
 389         if (retval != ERROR_OK)
 390                 return retval;
 391
 392         for (int i = 0; i < bank->num_sectors; i++) {
 393                 if (wrpr & (1 << i))
 394                         bank->sectors[i].is_protected = 1;
 395                 else
 396                         bank->sectors[i].is_protected = 0;
 397         }
 398         return ERROR_OK;
 399 }
 400
 401 static int stm32lx_erase(struct flash_bank *bank, int first, int last)
 402 {
 403         int retval;
 404
 405         /*
 406          * It could be possible to do a mass erase if all sectors must be
 407          * erased, but it is not implemented yet.
 408          */
 409
 410         if (bank->target->state != TARGET_HALTED) {
 411                 LOG_ERROR("Target not halted");
 412                 return ERROR_TARGET_NOT_HALTED;
 413         }
 414
 415         /*
 416          * Loop over the selected sectors and erase them
 417          */
 418         for (int i = first; i <= last; i++) {
 419                 retval = stm32lx_erase_sector(bank, i);
 420                 if (retval != ERROR_OK)
 421                         return retval;
 422                 bank->sectors[i].is_erased = 1;
 423         }
 424         return ERROR_OK;
 425 }
 426
 427 static int stm32lx_write_half_pages(struct flash_bank *bank, const uint8_t *buffer,
 428                 uint32_t offset, uint32_t count)
 429 {
 430         struct target *target = bank->target;
 431         struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
 432
 433         uint32_t hp_nb = stm32lx_info->part_info.page_size / 2;
 434         uint32_t buffer_size = 16384;
 435         struct working_area *write_algorithm;
 436         struct working_area *source;
 437         uint32_t address = bank->base + offset;
 438
 439         struct reg_param reg_params[3];
 440         struct armv7m_algorithm armv7m_info;
 441
 442         int retval = ERROR_OK;
 443
 444         static const uint8_t stm32lx_flash_write_code[] = {
 445 #include "../../../contrib/loaders/flash/stm32/stm32lx.inc"
 446         };
 447
 448         /* Make sure we're performing a half-page aligned write. */
 449         if (count % hp_nb) {
 450                 LOG_ERROR("The byte count must be %" PRIu32 "B-aligned but count is %" PRIi32 "B)", hp_nb, count);
 451                 return ERROR_FAIL;
 452         }
 453
 454         /* flash write code */
 455         if (target_alloc_working_area(target, sizeof(stm32lx_flash_write_code),
 456                         &write_algorithm) != ERROR_OK) {
 457                 LOG_DEBUG("no working area for block memory writes");
 458                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 459         }
 460
 461         /* Write the flashing code */
 462         retval = target_write_buffer(target,
 463                         write_algorithm->address,
 464                         sizeof(stm32lx_flash_write_code),
 465                         stm32lx_flash_write_code);
 466         if (retval != ERROR_OK) {
 467                 target_free_working_area(target, write_algorithm);
 468                 return retval;
 469         }
 470
 471         /* Allocate half pages memory */
 472         while (target_alloc_working_area_try(target, buffer_size, &source) != ERROR_OK) {
 473                 if (buffer_size > 1024)
 474                         buffer_size -= 1024;
 475                 else
 476                         buffer_size /= 2;
 477
 478                 if (buffer_size <= stm32lx_info->part_info.page_size) {
 479                         /* we already allocated the writing code, but failed to get a
 480                          * buffer, free the algorithm */
 481                         target_free_working_area(target, write_algorithm);
 482
 483                         LOG_WARNING("no large enough working area available, can't do block memory writes");
 484                         return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 485                 }
 486         }
 487
 488         armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
 489         armv7m_info.core_mode = ARM_MODE_THREAD;
 490         init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
 491         init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
 492         init_reg_param(&reg_params[2], "r2", 32, PARAM_OUT);
 493
 494         /* Enable half-page write */
 495         retval = stm32lx_enable_write_half_page(bank);
 496         if (retval != ERROR_OK) {
 497                 target_free_working_area(target, source);
 498                 target_free_working_area(target, write_algorithm);
 499
 500                 destroy_reg_param(&reg_params[0]);
 501                 destroy_reg_param(&reg_params[1]);
 502                 destroy_reg_param(&reg_params[2]);
 503                 return retval;
 504         }
 505
 506         struct armv7m_common *armv7m = target_to_armv7m(target);
 507         if (armv7m == NULL) {
 508
 509                 /* something is very wrong if armv7m is NULL */
 510                 LOG_ERROR("unable to get armv7m target");
 511                 return retval;
 512         }
 513
 514         /* save any DEMCR flags and configure target to catch any Hard Faults */
 515         uint32_t demcr_save = armv7m->demcr;
 516         armv7m->demcr = VC_HARDERR;
 517
 518         /* Loop while there are bytes to write */
 519         while (count > 0) {
 520                 uint32_t this_count;
 521                 this_count = (count > buffer_size) ? buffer_size : count;
 522
 523                 /* Write the next half pages */
 524                 retval = target_write_buffer(target, source->address, this_count, buffer);
 525                 if (retval != ERROR_OK)
 526                         break;
 527
 528                 /* 4: Store useful information in the registers */
 529                 /* the destination address of the copy (R0) */
 530                 buf_set_u32(reg_params[0].value, 0, 32, address);
 531                 /* The source address of the copy (R1) */
 532                 buf_set_u32(reg_params[1].value, 0, 32, source->address);
 533                 /* The length of the copy (R2) */
 534                 buf_set_u32(reg_params[2].value, 0, 32, this_count / 4);
 535
 536                 /* 5: Execute the bunch of code */
 537                 retval = target_run_algorithm(target, 0, NULL, sizeof(reg_params)
 538                                 / sizeof(*reg_params), reg_params,
 539                                 write_algorithm->address, 0, 10000, &armv7m_info);
 540                 if (retval != ERROR_OK)
 541                         break;
 542
 543                 /* check for Hard Fault */
 544                 if (armv7m->exception_number == 3)
 545                         break;
 546
 547                 /* 6: Wait while busy */
 548                 retval = stm32lx_wait_until_bsy_clear(bank);
 549                 if (retval != ERROR_OK)
 550                         break;
 551
 552                 buffer += this_count;
 553                 address += this_count;
 554                 count -= this_count;
 555         }
 556
 557         /* restore previous flags */
 558         armv7m->demcr = demcr_save;
 559
 560         if (armv7m->exception_number == 3) {
 561
 562                 /* the stm32l15x devices seem to have an issue when blank.
 563                  * if a ram loader is executed on a blank device it will
 564                  * Hard Fault, this issue does not happen for a already programmed device.
 565                  * A related issue is described in the stm32l151xx errata (Doc ID 17721 Rev 6 - 2.1.3).
 566                  * The workaround of handling the Hard Fault exception does work, but makes the
 567                  * loader more complicated, as a compromise we manually write the pages, programming time
 568                  * is reduced by 50% using this slower method.
 569                  */
 570
 571                 LOG_WARNING("Couldn't use loader, falling back to page memory writes");
 572
 573                 while (count > 0) {
 574                         uint32_t this_count;
 575                         this_count = (count > hp_nb) ? hp_nb : count;
 576
 577                         /* Write the next half pages */
 578                         retval = target_write_buffer(target, address, this_count, buffer);
 579                         if (retval != ERROR_OK)
 580                                 break;
 581
 582                         /* Wait while busy */
 583                         retval = stm32lx_wait_until_bsy_clear(bank);
 584                         if (retval != ERROR_OK)
 585                                 break;
 586
 587                         buffer += this_count;
 588                         address += this_count;
 589                         count -= this_count;
 590                 }
 591         }
 592
 593         if (retval == ERROR_OK)
 594                 retval = stm32lx_lock_program_memory(bank);
 595
 596         target_free_working_area(target, source);
 597         target_free_working_area(target, write_algorithm);
 598
 599         destroy_reg_param(&reg_params[0]);
 600         destroy_reg_param(&reg_params[1]);
 601         destroy_reg_param(&reg_params[2]);
 602
 603         return retval;
 604 }
 605
 606 static int stm32lx_write(struct flash_bank *bank, const uint8_t *buffer,
 607                 uint32_t offset, uint32_t count)
 608 {
 609         struct target *target = bank->target;
 610         struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
 611
 612         uint32_t hp_nb = stm32lx_info->part_info.page_size / 2;
 613         uint32_t halfpages_number;
 614         uint32_t bytes_remaining = 0;
 615         uint32_t address = bank->base + offset;
 616         uint32_t bytes_written = 0;
 617         int retval, retval2;
 618
 619         if (bank->target->state != TARGET_HALTED) {
 620                 LOG_ERROR("Target not halted");
 621                 return ERROR_TARGET_NOT_HALTED;
 622         }
 623
 624         if (offset & 0x3) {
 625                 LOG_ERROR("offset 0x%" PRIx32 " breaks required 4-byte alignment", offset);
 626                 return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
 627         }
 628
 629         retval = stm32lx_unlock_program_memory(bank);
 630         if (retval != ERROR_OK)
 631                 return retval;
 632
 633         /* first we need to write any unaligned head bytes upto
 634          * the next 128 byte page */
 635
 636         if (offset % hp_nb)
 637                 bytes_remaining = MIN(count, hp_nb - (offset % hp_nb));
 638
 639         while (bytes_remaining > 0) {
 640                 uint8_t value[4] = {0xff, 0xff, 0xff, 0xff};
 641
 642                 /* copy remaining bytes into the write buffer */
 643                 uint32_t bytes_to_write = MIN(4, bytes_remaining);
 644                 memcpy(value, buffer + bytes_written, bytes_to_write);
 645
 646                 retval = target_write_buffer(target, address, 4, value);
 647                 if (retval != ERROR_OK)
 648                         goto reset_pg_and_lock;
 649
 650                 bytes_written += bytes_to_write;
 651                 bytes_remaining -= bytes_to_write;
 652                 address += 4;
 653
 654                 retval = stm32lx_wait_until_bsy_clear(bank);
 655                 if (retval != ERROR_OK)
 656                         goto reset_pg_and_lock;
 657         }
 658
 659         offset += bytes_written;
 660         count -= bytes_written;
 661
 662         /* this should always pass this check here */
 663         assert((offset % hp_nb) == 0);
 664
 665         /* calculate half pages */
 666         halfpages_number = count / hp_nb;
 667
 668         if (halfpages_number) {
 669                 retval = stm32lx_write_half_pages(bank, buffer + bytes_written, offset, hp_nb * halfpages_number);
 670                 if (retval == ERROR_TARGET_RESOURCE_NOT_AVAILABLE) {
 671                         /* attempt slow memory writes */
 672                         LOG_WARNING("couldn't use block writes, falling back to single memory accesses");
 673                         halfpages_number = 0;
 674                 } else {
 675                         if (retval != ERROR_OK)
 676                                 return ERROR_FAIL;
 677                 }
 678         }
 679
 680         /* write any remaining bytes */
 681         uint32_t page_bytes_written = hp_nb * halfpages_number;
 682         bytes_written += page_bytes_written;
 683         address += page_bytes_written;
 684         bytes_remaining = count - page_bytes_written;
 685
 686         retval = stm32lx_unlock_program_memory(bank);
 687         if (retval != ERROR_OK)
 688                 return retval;
 689
 690         while (bytes_remaining > 0) {
 691                 uint8_t value[4] = {0xff, 0xff, 0xff, 0xff};
 692
 693                 /* copy remaining bytes into the write buffer */
 694                 uint32_t bytes_to_write = MIN(4, bytes_remaining);
 695                 memcpy(value, buffer + bytes_written, bytes_to_write);
 696
 697                 retval = target_write_buffer(target, address, 4, value);
 698                 if (retval != ERROR_OK)
 699                         goto reset_pg_and_lock;
 700
 701                 bytes_written += bytes_to_write;
 702                 bytes_remaining -= bytes_to_write;
 703                 address += 4;
 704
 705                 retval = stm32lx_wait_until_bsy_clear(bank);
 706                 if (retval != ERROR_OK)
 707                         goto reset_pg_and_lock;
 708         }
 709
 710 reset_pg_and_lock:
 711         retval2 = stm32lx_lock_program_memory(bank);
 712         if (retval == ERROR_OK)
 713                 retval = retval2;
 714
 715         return retval;
 716 }
 717
 718 static int stm32lx_read_id_code(struct target *target, uint32_t *id)
 719 {
 720         struct armv7m_common *armv7m = target_to_armv7m(target);
 721         int retval;
 722         if (armv7m->arm.is_armv6m == true)
 723                 retval = target_read_u32(target, DBGMCU_IDCODE_L0, id);
 724         else
 725         /* read stm32 device id register */
 726                 retval = target_read_u32(target, DBGMCU_IDCODE, id);
 727         return retval;
 728 }
 729
 730 static int stm32lx_probe(struct flash_bank *bank)
 731 {
 732         struct target *target = bank->target;
 733         struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
 734         int i;
 735         uint16_t flash_size_in_kb;
 736         uint32_t device_id;
 737         uint32_t base_address = FLASH_BANK0_ADDRESS;
 738         uint32_t second_bank_base;
 739         unsigned int n;
 740
 741         stm32lx_info->probed = 0;
 742
 743         int retval = stm32lx_read_id_code(bank->target, &device_id);
 744         if (retval != ERROR_OK)
 745                 return retval;
 746
 747         stm32lx_info->idcode = device_id;
 748
 749         LOG_DEBUG("device id = 0x%08" PRIx32 "", device_id);
 750
 751         for (n = 0; n < ARRAY_SIZE(stm32lx_parts); n++) {
 752                 if ((device_id & 0xfff) == stm32lx_parts[n].id) {
 753                         stm32lx_info->part_info = stm32lx_parts[n];
 754                         break;
 755                 }
 756         }
 757
 758         if (n == ARRAY_SIZE(stm32lx_parts)) {
 759                 LOG_WARNING("Cannot identify target as a STM32L family.");
 760                 return ERROR_FAIL;
 761         } else {
 762                 LOG_INFO("Device: %s", stm32lx_info->part_info.device_str);
 763         }
 764
 765         stm32lx_info->flash_base = stm32lx_info->part_info.flash_base;
 766
 767         /* Get the flash size from target. */
 768         retval = target_read_u16(target, stm32lx_info->part_info.fsize_base,
 769                         &flash_size_in_kb);
 770
 771         /* 0x436 devices report their flash size as a 0 or 1 code indicating 384K
 772          * or 256K, respectively.  Please see RM0038 r8 or newer and refer to
 773          * section 30.1.1. */
 774         if (retval == ERROR_OK && (device_id & 0xfff) == 0x436) {
 775                 if (flash_size_in_kb == 0)
 776                         flash_size_in_kb = 384;
 777                 else if (flash_size_in_kb == 1)
 778                         flash_size_in_kb = 256;
 779         }
 780
 781         /* 0x429 devices only use the lowest 8 bits of the flash size register */
 782         if (retval == ERROR_OK && (device_id & 0xfff) == 0x429) {
 783                 flash_size_in_kb &= 0xff;
 784         }
 785
 786         /* Failed reading flash size or flash size invalid (early silicon),
 787          * default to max target family */
 788         if (retval != ERROR_OK || flash_size_in_kb == 0xffff || flash_size_in_kb == 0) {
 789                 LOG_WARNING("STM32L flash size failed, probe inaccurate - assuming %dk flash",
 790                         stm32lx_info->part_info.max_flash_size_kb);
 791                 flash_size_in_kb = stm32lx_info->part_info.max_flash_size_kb;
 792         } else if (flash_size_in_kb > stm32lx_info->part_info.max_flash_size_kb) {
 793                 LOG_WARNING("STM32L probed flash size assumed incorrect since FLASH_SIZE=%dk > %dk, - assuming %dk flash",
 794                         flash_size_in_kb, stm32lx_info->part_info.max_flash_size_kb,
 795                         stm32lx_info->part_info.max_flash_size_kb);
 796                 flash_size_in_kb = stm32lx_info->part_info.max_flash_size_kb;
 797         }
 798
 799         /* Overwrite default dual-bank configuration */
 800         retval = stm32lx_update_part_info(bank, flash_size_in_kb);
 801         if (retval != ERROR_OK)
 802                 return ERROR_FAIL;
 803
 804         if (stm32lx_info->part_info.has_dual_banks) {
 805                 /* Use the configured base address to determine if this is the first or second flash bank.
 806                  * Verify that the base address is reasonably correct and determine the flash bank size
 807                  */
 808                 second_bank_base = base_address +
 809                         stm32lx_info->part_info.first_bank_size_kb * 1024;
 810                 if (bank->base == second_bank_base || !bank->base) {
 811                         /* This is the second bank  */
 812                         base_address = second_bank_base;
 813                         flash_size_in_kb = flash_size_in_kb -
 814                                 stm32lx_info->part_info.first_bank_size_kb;
 815                 } else if (bank->base == base_address) {
 816                         /* This is the first bank */
 817                         flash_size_in_kb = stm32lx_info->part_info.first_bank_size_kb;
 818                 } else {
 819                         LOG_WARNING("STM32L flash bank base address config is incorrect. "
 820                                         TARGET_ADDR_FMT " but should rather be 0x%" PRIx32
 821                                         " or 0x%" PRIx32,
 822                                                 bank->base, base_address, second_bank_base);
 823                         return ERROR_FAIL;
 824                 }
 825                 LOG_INFO("STM32L flash has dual banks. Bank (%d) size is %dkb, base address is 0x%" PRIx32,
 826                                 bank->bank_number, flash_size_in_kb, base_address);
 827         } else {
 828                 LOG_INFO("STM32L flash size is %dkb, base address is 0x%" PRIx32, flash_size_in_kb, base_address);
 829         }
 830
 831         /* if the user sets the size manually then ignore the probed value
 832          * this allows us to work around devices that have a invalid flash size register value */
 833         if (stm32lx_info->user_bank_size) {
 834                 flash_size_in_kb = stm32lx_info->user_bank_size / 1024;
 835                 LOG_INFO("ignoring flash probed value, using configured bank size: %dkbytes", flash_size_in_kb);
 836         }
 837
 838         /* calculate numbers of sectors (4kB per sector) */
 839         int num_sectors = (flash_size_in_kb * 1024) / FLASH_SECTOR_SIZE;
 840
 841         if (bank->sectors) {
 842                 free(bank->sectors);
 843                 bank->sectors = NULL;
 844         }
 845
 846         bank->size = flash_size_in_kb * 1024;
 847         bank->base = base_address;
 848         bank->num_sectors = num_sectors;
 849         bank->sectors = malloc(sizeof(struct flash_sector) * num_sectors);
 850         if (bank->sectors == NULL) {
 851                 LOG_ERROR("failed to allocate bank sectors");
 852                 return ERROR_FAIL;
 853         }
 854
 855         for (i = 0; i < num_sectors; i++) {
 856                 bank->sectors[i].offset = i * FLASH_SECTOR_SIZE;
 857                 bank->sectors[i].size = FLASH_SECTOR_SIZE;
 858                 bank->sectors[i].is_erased = -1;
 859                 bank->sectors[i].is_protected = -1;
 860         }
 861
 862         stm32lx_info->probed = 1;
 863
 864         return ERROR_OK;
 865 }
 866
 867 static int stm32lx_auto_probe(struct flash_bank *bank)
 868 {
 869         struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
 870
 871         if (stm32lx_info->probed)
 872                 return ERROR_OK;
 873
 874         return stm32lx_probe(bank);
 875 }
 876
 877 /* This method must return a string displaying information about the bank */
 878 static int stm32lx_get_info(struct flash_bank *bank, char *buf, int buf_size)
 879 {
 880         struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
 881         const struct stm32lx_part_info *info = &stm32lx_info->part_info;
 882         uint16_t rev_id = stm32lx_info->idcode >> 16;
 883         const char *rev_str = NULL;
 884
 885         if (!stm32lx_info->probed) {
 886                 int retval = stm32lx_probe(bank);
 887                 if (retval != ERROR_OK) {
 888                         snprintf(buf, buf_size,
 889                                 "Unable to find bank information.");
 890                         return retval;
 891                 }
 892         }
 893
 894         for (unsigned int i = 0; i < info->num_revs; i++)
 895                 if (rev_id == info->revs[i].rev)
 896                         rev_str = info->revs[i].str;
 897
 898         if (rev_str != NULL) {
 899                 snprintf(buf, buf_size,
 900                         "%s - Rev: %s",
 901                         info->device_str, rev_str);
 902         } else {
 903                 snprintf(buf, buf_size,
 904                         "%s - Rev: unknown (0x%04x)",
 905                         info->device_str, rev_id);
 906         }
 907
 908         return ERROR_OK;
 909 }
 910
 911 static const struct command_registration stm32lx_exec_command_handlers[] = {
 912         {
 913                 .name = "mass_erase",
 914                 .handler = stm32lx_handle_mass_erase_command,
 915                 .mode = COMMAND_EXEC,
 916                 .usage = "bank_id",
 917                 .help = "Erase entire flash device. including available EEPROM",
 918         },
 919         {
 920                 .name = "lock",
 921                 .handler = stm32lx_handle_lock_command,
 922                 .mode = COMMAND_EXEC,
 923                 .usage = "bank_id",
 924                 .help = "Increase the readout protection to Level 1.",
 925         },
 926         {
 927                 .name = "unlock",
 928                 .handler = stm32lx_handle_unlock_command,
 929                 .mode = COMMAND_EXEC,
 930                 .usage = "bank_id",
 931                 .help = "Lower the readout protection from Level 1 to 0.",
 932         },
 933         COMMAND_REGISTRATION_DONE
 934 };
 935
 936 static const struct command_registration stm32lx_command_handlers[] = {
 937         {
 938                 .name = "stm32lx",
 939                 .mode = COMMAND_ANY,
 940                 .help = "stm32lx flash command group",
 941                 .usage = "",
 942                 .chain = stm32lx_exec_command_handlers,
 943         },
 944         COMMAND_REGISTRATION_DONE
 945 };
 946
 947 const struct flash_driver stm32lx_flash = {
 948                 .name = "stm32lx",
 949                 .commands = stm32lx_command_handlers,
 950                 .flash_bank_command = stm32lx_flash_bank_command,
 951                 .erase = stm32lx_erase,
 952                 .write = stm32lx_write,
 953                 .read = default_flash_read,
 954                 .probe = stm32lx_probe,
 955                 .auto_probe = stm32lx_auto_probe,
 956                 .erase_check = default_flash_blank_check,
 957                 .protect_check = stm32lx_protect_check,
 958                 .info = stm32lx_get_info,
 959                 .free_driver_priv = default_flash_free_driver_priv,
 960 };
 961
 962 /* Static methods implementation */
 963 static int stm32lx_unlock_program_memory(struct flash_bank *bank)
 964 {
 965         struct target *target = bank->target;
 966         struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
 967         int retval;
 968         uint32_t reg32;
 969
 970         /*
 971          * Unlocking the program memory is done by unlocking the PECR,
 972          * then by writing the 2 PRGKEY to the PRGKEYR register
 973          */
 974
 975         /* check flash is not already unlocked */
 976         retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_PECR,
 977                         &reg32);
 978         if (retval != ERROR_OK)
 979                 return retval;
 980
 981         if ((reg32 & FLASH_PECR__PRGLOCK) == 0)
 982                 return ERROR_OK;
 983
 984         /* To unlock the PECR write the 2 PEKEY to the PEKEYR register */
 985         retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PEKEYR,
 986                         PEKEY1);
 987         if (retval != ERROR_OK)
 988                 return retval;
 989
 990         retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PEKEYR,
 991                         PEKEY2);
 992         if (retval != ERROR_OK)
 993                 return retval;
 994
 995         /* Make sure it worked */
 996         retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_PECR,
 997                         &reg32);
 998         if (retval != ERROR_OK)
 999                 return retval;
1000
1001         if (reg32 & FLASH_PECR__PELOCK) {
1002                 LOG_ERROR("PELOCK is not cleared :(");
1003                 return ERROR_FLASH_OPERATION_FAILED;
1004         }
1005
1006         retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PRGKEYR,
1007                         PRGKEY1);
1008         if (retval != ERROR_OK)
1009                 return retval;
1010         retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PRGKEYR,
1011                         PRGKEY2);
1012         if (retval != ERROR_OK)
1013                 return retval;
1014
1015         /* Make sure it worked */
1016         retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1017                         &reg32);
1018         if (retval != ERROR_OK)
1019                 return retval;
1020
1021         if (reg32 & FLASH_PECR__PRGLOCK) {
1022                 LOG_ERROR("PRGLOCK is not cleared :(");
1023                 return ERROR_FLASH_OPERATION_FAILED;
1024         }
1025
1026         return ERROR_OK;
1027 }
1028
1029 static int stm32lx_enable_write_half_page(struct flash_bank *bank)
1030 {
1031         struct target *target = bank->target;
1032         struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
1033         int retval;
1034         uint32_t reg32;
1035
1036         /**
1037          * Unlock the program memory, then set the FPRG bit in the PECR register.
1038          */
1039         retval = stm32lx_unlock_program_memory(bank);
1040         if (retval != ERROR_OK)
1041                 return retval;
1042
1043         retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1044                         &reg32);
1045         if (retval != ERROR_OK)
1046                 return retval;
1047
1048         reg32 |= FLASH_PECR__FPRG;
1049         retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1050                         reg32);
1051         if (retval != ERROR_OK)
1052                 return retval;
1053
1054         retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1055                         &reg32);
1056         if (retval != ERROR_OK)
1057                 return retval;
1058
1059         reg32 |= FLASH_PECR__PROG;
1060         retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1061                         reg32);
1062
1063         return retval;
1064 }
1065
1066 static int stm32lx_lock_program_memory(struct flash_bank *bank)
1067 {
1068         struct target *target = bank->target;
1069         struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
1070         int retval;
1071         uint32_t reg32;
1072
1073         /* To lock the program memory, simply set the lock bit and lock PECR */
1074
1075         retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1076                         &reg32);
1077         if (retval != ERROR_OK)
1078                 return retval;
1079
1080         reg32 |= FLASH_PECR__PRGLOCK;
1081         retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1082                         reg32);
1083         if (retval != ERROR_OK)
1084                 return retval;
1085
1086         retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1087                         &reg32);
1088         if (retval != ERROR_OK)
1089                 return retval;
1090
1091         reg32 |= FLASH_PECR__PELOCK;
1092         retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1093                         reg32);
1094         if (retval != ERROR_OK)
1095                 return retval;
1096
1097         return ERROR_OK;
1098 }
1099
1100 static int stm32lx_erase_sector(struct flash_bank *bank, int sector)
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          * To erase a sector (i.e. stm32lx_info->part_info.pages_per_sector pages),
1109          * first unlock the memory, loop over the pages of this sector
1110          * and write 0x0 to its first word.
1111          */
1112
1113         retval = stm32lx_unlock_program_memory(bank);
1114         if (retval != ERROR_OK)
1115                 return retval;
1116
1117         for (int page = 0; page < (int)stm32lx_info->part_info.pages_per_sector;
1118                         page++) {
1119                 reg32 = FLASH_PECR__PROG | FLASH_PECR__ERASE;
1120                 retval = target_write_u32(target,
1121                                 stm32lx_info->flash_base + FLASH_PECR, reg32);
1122                 if (retval != ERROR_OK)
1123                         return retval;
1124
1125                 retval = stm32lx_wait_until_bsy_clear(bank);
1126                 if (retval != ERROR_OK)
1127                         return retval;
1128
1129                 uint32_t addr = bank->base + bank->sectors[sector].offset + (page
1130                                 * stm32lx_info->part_info.page_size);
1131                 retval = target_write_u32(target, addr, 0x0);
1132                 if (retval != ERROR_OK)
1133                         return retval;
1134
1135                 retval = stm32lx_wait_until_bsy_clear(bank);
1136                 if (retval != ERROR_OK)
1137                         return retval;
1138         }
1139
1140         retval = stm32lx_lock_program_memory(bank);
1141         if (retval != ERROR_OK)
1142                 return retval;
1143
1144         return ERROR_OK;
1145 }
1146
1147 static inline int stm32lx_get_flash_status(struct flash_bank *bank, uint32_t *status)
1148 {
1149         struct target *target = bank->target;
1150         struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
1151
1152         return target_read_u32(target, stm32lx_info->flash_base + FLASH_SR, status);
1153 }
1154
1155 static int stm32lx_wait_until_bsy_clear(struct flash_bank *bank)
1156 {
1157         return stm32lx_wait_until_bsy_clear_timeout(bank, 100);
1158 }
1159
1160 static int stm32lx_unlock_options_bytes(struct flash_bank *bank)
1161 {
1162         struct target *target = bank->target;
1163         struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
1164         int retval;
1165         uint32_t reg32;
1166
1167         /*
1168         * Unlocking the options bytes is done by unlocking the PECR,
1169         * then by writing the 2 FLASH_PEKEYR to the FLASH_OPTKEYR register
1170         */
1171
1172         /* check flash is not already unlocked */
1173         retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_PECR, &reg32);
1174         if (retval != ERROR_OK)
1175                 return retval;
1176
1177         if ((reg32 & FLASH_PECR__OPTLOCK) == 0)
1178                 return ERROR_OK;
1179
1180         if ((reg32 & FLASH_PECR__PELOCK) != 0) {
1181
1182                 retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PEKEYR, PEKEY1);
1183                 if (retval != ERROR_OK)
1184                         return retval;
1185
1186                 retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PEKEYR, PEKEY2);
1187                 if (retval != ERROR_OK)
1188                         return retval;
1189         }
1190
1191         /* To unlock the PECR write the 2 OPTKEY to the FLASH_OPTKEYR register */
1192         retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_OPTKEYR, OPTKEY1);
1193         if (retval != ERROR_OK)
1194                 return retval;
1195
1196         retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_OPTKEYR, OPTKEY2);
1197         if (retval != ERROR_OK)
1198                 return retval;
1199
1200         return ERROR_OK;
1201 }
1202
1203 static int stm32lx_wait_until_bsy_clear_timeout(struct flash_bank *bank, int timeout)
1204 {
1205         struct target *target = bank->target;
1206         struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
1207         uint32_t status;
1208         int retval = ERROR_OK;
1209
1210         /* wait for busy to clear */
1211         for (;;) {
1212                 retval = stm32lx_get_flash_status(bank, &status);
1213                 if (retval != ERROR_OK)
1214                         return retval;
1215
1216                 LOG_DEBUG("status: 0x%" PRIx32 "", status);
1217                 if ((status & FLASH_SR__BSY) == 0)
1218                         break;
1219
1220                 if (timeout-- <= 0) {
1221                         LOG_ERROR("timed out waiting for flash");
1222                         return ERROR_FAIL;
1223                 }
1224                 alive_sleep(1);
1225         }
1226
1227         if (status & FLASH_SR__WRPERR) {
1228                 LOG_ERROR("access denied / write protected");
1229                 retval = ERROR_FAIL;
1230         }
1231
1232         if (status & FLASH_SR__PGAERR) {
1233                 LOG_ERROR("invalid program address");
1234                 retval = ERROR_FAIL;
1235         }
1236
1237         /* Clear but report errors */
1238         if (status & FLASH_SR__OPTVERR) {
1239                 /* If this operation fails, we ignore it and report the original retval */
1240                 target_write_u32(target, stm32lx_info->flash_base + FLASH_SR, status & FLASH_SR__OPTVERR);
1241         }
1242
1243         return retval;
1244 }
1245
1246 static int stm32lx_obl_launch(struct flash_bank *bank)
1247 {
1248         struct target *target = bank->target;
1249         struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
1250         int retval;
1251
1252         /* This will fail as the target gets immediately rebooted */
1253         target_write_u32(target, stm32lx_info->flash_base + FLASH_PECR,
1254                          FLASH_PECR__OBL_LAUNCH);
1255
1256         size_t tries = 10;
1257         do {
1258                 target_halt(target);
1259                 retval = target_poll(target);
1260         } while (--tries > 0 &&
1261                  (retval != ERROR_OK || target->state != TARGET_HALTED));
1262
1263         return tries ? ERROR_OK : ERROR_FAIL;
1264 }
1265
1266 static int stm32lx_lock(struct flash_bank *bank)
1267 {
1268         int retval;
1269         struct target *target = bank->target;
1270
1271         if (target->state != TARGET_HALTED) {
1272                 LOG_ERROR("Target not halted");
1273                 return ERROR_TARGET_NOT_HALTED;
1274         }
1275
1276         retval = stm32lx_unlock_options_bytes(bank);
1277         if (retval != ERROR_OK)
1278                 return retval;
1279
1280         /* set the RDP protection level to 1 */
1281         retval = target_write_u32(target, OPTION_BYTES_ADDRESS, OPTION_BYTE_0_PR1);
1282         if (retval != ERROR_OK)
1283                 return retval;
1284
1285         return ERROR_OK;
1286 }
1287
1288 static int stm32lx_unlock(struct flash_bank *bank)
1289 {
1290         int retval;
1291         struct target *target = bank->target;
1292
1293         if (target->state != TARGET_HALTED) {
1294                 LOG_ERROR("Target not halted");
1295                 return ERROR_TARGET_NOT_HALTED;
1296         }
1297
1298         retval = stm32lx_unlock_options_bytes(bank);
1299         if (retval != ERROR_OK)
1300                 return retval;
1301
1302         /* set the RDP protection level to 0 */
1303         retval = target_write_u32(target, OPTION_BYTES_ADDRESS, OPTION_BYTE_0_PR0);
1304         if (retval != ERROR_OK)
1305                 return retval;
1306
1307         retval = stm32lx_wait_until_bsy_clear_timeout(bank, 30000);
1308         if (retval != ERROR_OK)
1309                 return retval;
1310
1311         return ERROR_OK;
1312 }
1313
1314 static int stm32lx_mass_erase(struct flash_bank *bank)
1315 {
1316         int retval;
1317         struct target *target = bank->target;
1318         struct stm32lx_flash_bank *stm32lx_info = NULL;
1319         uint32_t reg32;
1320
1321         if (target->state != TARGET_HALTED) {
1322                 LOG_ERROR("Target not halted");
1323                 return ERROR_TARGET_NOT_HALTED;
1324         }
1325
1326         stm32lx_info = bank->driver_priv;
1327
1328         retval = stm32lx_lock(bank);
1329         if (retval != ERROR_OK)
1330                 return retval;
1331
1332         retval = stm32lx_obl_launch(bank);
1333         if (retval != ERROR_OK)
1334                 return retval;
1335
1336         retval = stm32lx_unlock(bank);
1337         if (retval != ERROR_OK)
1338                 return retval;
1339
1340         retval = stm32lx_obl_launch(bank);
1341         if (retval != ERROR_OK)
1342                 return retval;
1343
1344         retval = target_read_u32(target, stm32lx_info->flash_base + FLASH_PECR, &reg32);
1345         if (retval != ERROR_OK)
1346                 return retval;
1347
1348         retval = target_write_u32(target, stm32lx_info->flash_base + FLASH_PECR, reg32 | FLASH_PECR__OPTLOCK);
1349         if (retval != ERROR_OK)
1350                 return retval;
1351
1352         return ERROR_OK;
1353 }
1354
1355 static int stm32lx_update_part_info(struct flash_bank *bank, uint16_t flash_size_in_kb)
1356 {
1357         struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
1358
1359         switch (stm32lx_info->part_info.id) {
1360         case 0x447: /* STM32L0xx (Cat.5) devices */
1361                 if (flash_size_in_kb == 192 || flash_size_in_kb == 128) {
1362                         stm32lx_info->part_info.first_bank_size_kb = flash_size_in_kb / 2;
1363                         stm32lx_info->part_info.has_dual_banks = true;
1364                 }
1365                 break;
1366         case 0x437: /* STM32L1xx (Cat.5/Cat.6) */
1367                 stm32lx_info->part_info.first_bank_size_kb = flash_size_in_kb / 2;
1368                 break;
1369         }
1370
1371         return ERROR_OK;
1372 }