git.sur5r.net Git - openocd/blob - src/flash/stm32x.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.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, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include "replacements.h"
  25
  26 #include "stm32x.h"
  27 #include "flash.h"
  28 #include "target.h"
  29 #include "log.h"
  30 #include "armv7m.h"
  31 #include "algorithm.h"
  32 #include "binarybuffer.h"
  33
  34 #include <stdlib.h>
  35 #include <string.h>
  36
  37 int stm32x_register_commands(struct command_context_s *cmd_ctx);
  38 int stm32x_flash_bank_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct flash_bank_s *bank);
  39 int stm32x_erase(struct flash_bank_s *bank, int first, int last);
  40 int stm32x_protect(struct flash_bank_s *bank, int set, int first, int last);
  41 int stm32x_write(struct flash_bank_s *bank, u8 *buffer, u32 offset, u32 count);
  42 int stm32x_probe(struct flash_bank_s *bank);
  43 int stm32x_auto_probe(struct flash_bank_s *bank);
  44 int stm32x_handle_part_id_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  45 int stm32x_protect_check(struct flash_bank_s *bank);
  46 int stm32x_info(struct flash_bank_s *bank, char *buf, int buf_size);
  47
  48 int stm32x_handle_lock_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  49 int stm32x_handle_unlock_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  50 int stm32x_handle_options_read_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  51 int stm32x_handle_options_write_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  52 int stm32x_handle_mass_erase_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  53 int stm32x_mass_erase(struct flash_bank_s *bank);
  54
  55 flash_driver_t stm32x_flash =
  56 {
  57         .name = "stm32x",
  58         .register_commands = stm32x_register_commands,
  59         .flash_bank_command = stm32x_flash_bank_command,
  60         .erase = stm32x_erase,
  61         .protect = stm32x_protect,
  62         .write = stm32x_write,
  63         .probe = stm32x_probe,
  64         .auto_probe = stm32x_auto_probe,
  65         .erase_check = default_flash_mem_blank_check,
  66         .protect_check = stm32x_protect_check,
  67         .info = stm32x_info
  68 };
  69
  70 int stm32x_register_commands(struct command_context_s *cmd_ctx)
  71 {
  72         command_t *stm32x_cmd = register_command(cmd_ctx, NULL, "stm32x", NULL, COMMAND_ANY, "stm32x flash specific commands");
  73
  74         register_command(cmd_ctx, stm32x_cmd, "lock", stm32x_handle_lock_command, COMMAND_EXEC,
  75                                          "lock device");
  76         register_command(cmd_ctx, stm32x_cmd, "unlock", stm32x_handle_unlock_command, COMMAND_EXEC,
  77                                          "unlock protected device");
  78         register_command(cmd_ctx, stm32x_cmd, "mass_erase", stm32x_handle_mass_erase_command, COMMAND_EXEC,
  79                                          "mass erase device");
  80         register_command(cmd_ctx, stm32x_cmd, "options_read", stm32x_handle_options_read_command, COMMAND_EXEC,
  81                                          "read device option bytes");
  82         register_command(cmd_ctx, stm32x_cmd, "options_write", stm32x_handle_options_write_command, COMMAND_EXEC,
  83                                          "write device option bytes");
  84         return ERROR_OK;
  85 }
  86
  87 /* flash bank stm32x <base> <size> 0 0 <target#>
  88  */
  89 int stm32x_flash_bank_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct flash_bank_s *bank)
  90 {
  91         stm32x_flash_bank_t *stm32x_info;
  92
  93         if (argc < 6)
  94         {
  95                 LOG_WARNING("incomplete flash_bank stm32x configuration");
  96                 return ERROR_FLASH_BANK_INVALID;
  97         }
  98
  99         stm32x_info = malloc(sizeof(stm32x_flash_bank_t));
 100         bank->driver_priv = stm32x_info;
 101
 102         stm32x_info->write_algorithm = NULL;
 103         stm32x_info->probed = 0;
 104
 105         return ERROR_OK;
 106 }
 107
 108 u32 stm32x_get_flash_status(flash_bank_t *bank)
 109 {
 110         target_t *target = bank->target;
 111         u32 status;
 112
 113         target_read_u32(target, STM32_FLASH_SR, &status);
 114
 115         return status;
 116 }
 117
 118 u32 stm32x_wait_status_busy(flash_bank_t *bank, int timeout)
 119 {
 120         u32 status;
 121
 122         /* wait for busy to clear */
 123         while (((status = stm32x_get_flash_status(bank)) & FLASH_BSY) && (timeout-- > 0))
 124         {
 125                 LOG_DEBUG("status: 0x%x", status);
 126                 usleep(1000);
 127         }
 128
 129         return status;
 130 }
 131
 132 int stm32x_read_options(struct flash_bank_s *bank)
 133 {
 134         u32 optiondata;
 135         stm32x_flash_bank_t *stm32x_info = NULL;
 136         target_t *target = bank->target;
 137
 138         stm32x_info = bank->driver_priv;
 139
 140         /* read current option bytes */
 141         target_read_u32(target, STM32_FLASH_OBR, &optiondata);
 142
 143         stm32x_info->option_bytes.user_options = (u16)0xFFF8|((optiondata >> 2) & 0x07);
 144         stm32x_info->option_bytes.RDP = (optiondata & (1 << OPT_READOUT)) ? 0xFFFF : 0x5AA5;
 145
 146         if (optiondata & (1 << OPT_READOUT))
 147                 LOG_INFO("Device Security Bit Set");
 148
 149         /* each bit refers to a 4bank protection */
 150         target_read_u32(target, STM32_FLASH_WRPR, &optiondata);
 151
 152         stm32x_info->option_bytes.protection[0] = (u16)optiondata;
 153         stm32x_info->option_bytes.protection[1] = (u16)(optiondata >> 8);
 154         stm32x_info->option_bytes.protection[2] = (u16)(optiondata >> 16);
 155         stm32x_info->option_bytes.protection[3] = (u16)(optiondata >> 24);
 156
 157         return ERROR_OK;
 158 }
 159
 160 int stm32x_erase_options(struct flash_bank_s *bank)
 161 {
 162         stm32x_flash_bank_t *stm32x_info = NULL;
 163         target_t *target = bank->target;
 164         u32 status;
 165
 166         stm32x_info = bank->driver_priv;
 167
 168         /* read current options */
 169         stm32x_read_options(bank);
 170
 171         /* unlock flash registers */
 172         target_write_u32(target, STM32_FLASH_KEYR, KEY1);
 173         target_write_u32(target, STM32_FLASH_KEYR, KEY2);
 174
 175         /* unlock option flash registers */
 176         target_write_u32(target, STM32_FLASH_OPTKEYR, KEY1);
 177         target_write_u32(target, STM32_FLASH_OPTKEYR, KEY2);
 178
 179         /* erase option bytes */
 180         target_write_u32(target, STM32_FLASH_CR, FLASH_OPTER|FLASH_OPTWRE);
 181         target_write_u32(target, STM32_FLASH_CR, FLASH_OPTER|FLASH_STRT|FLASH_OPTWRE);
 182
 183         status = stm32x_wait_status_busy(bank, 10);
 184
 185         if( status & FLASH_WRPRTERR )
 186                 return ERROR_FLASH_OPERATION_FAILED;
 187         if( status & FLASH_PGERR )
 188                 return ERROR_FLASH_OPERATION_FAILED;
 189
 190         /* clear readout protection and complementary option bytes
 191          * this will also force a device unlock if set */
 192         stm32x_info->option_bytes.RDP = 0x5AA5;
 193
 194         return ERROR_OK;
 195 }
 196
 197 int stm32x_write_options(struct flash_bank_s *bank)
 198 {
 199         stm32x_flash_bank_t *stm32x_info = NULL;
 200         target_t *target = bank->target;
 201         u32 status;
 202
 203         stm32x_info = bank->driver_priv;
 204
 205         /* unlock flash registers */
 206         target_write_u32(target, STM32_FLASH_KEYR, KEY1);
 207         target_write_u32(target, STM32_FLASH_KEYR, KEY2);
 208
 209         /* unlock option flash registers */
 210         target_write_u32(target, STM32_FLASH_OPTKEYR, KEY1);
 211         target_write_u32(target, STM32_FLASH_OPTKEYR, KEY2);
 212
 213         /* program option bytes */
 214         target_write_u32(target, STM32_FLASH_CR, FLASH_OPTPG|FLASH_OPTWRE);
 215
 216         /* write user option byte */
 217         target_write_u16(target, STM32_OB_USER, stm32x_info->option_bytes.user_options);
 218
 219         status = stm32x_wait_status_busy(bank, 10);
 220
 221         if( status & FLASH_WRPRTERR )
 222                 return ERROR_FLASH_OPERATION_FAILED;
 223         if( status & FLASH_PGERR )
 224                 return ERROR_FLASH_OPERATION_FAILED;
 225
 226         /* write protection byte 1 */
 227         target_write_u16(target, STM32_OB_WRP0, stm32x_info->option_bytes.protection[0]);
 228
 229         status = stm32x_wait_status_busy(bank, 10);
 230
 231         if( status & FLASH_WRPRTERR )
 232                 return ERROR_FLASH_OPERATION_FAILED;
 233         if( status & FLASH_PGERR )
 234                 return ERROR_FLASH_OPERATION_FAILED;
 235
 236         /* write protection byte 2 */
 237         target_write_u16(target, STM32_OB_WRP1, stm32x_info->option_bytes.protection[1]);
 238
 239         status = stm32x_wait_status_busy(bank, 10);
 240
 241         if( status & FLASH_WRPRTERR )
 242                 return ERROR_FLASH_OPERATION_FAILED;
 243         if( status & FLASH_PGERR )
 244                 return ERROR_FLASH_OPERATION_FAILED;
 245
 246         /* write protection byte 3 */
 247         target_write_u16(target, STM32_OB_WRP2, stm32x_info->option_bytes.protection[2]);
 248
 249         status = stm32x_wait_status_busy(bank, 10);
 250
 251         if( status & FLASH_WRPRTERR )
 252                 return ERROR_FLASH_OPERATION_FAILED;
 253         if( status & FLASH_PGERR )
 254                 return ERROR_FLASH_OPERATION_FAILED;
 255
 256         /* write protection byte 4 */
 257         target_write_u16(target, STM32_OB_WRP3, stm32x_info->option_bytes.protection[3]);
 258
 259         status = stm32x_wait_status_busy(bank, 10);
 260
 261         if( status & FLASH_WRPRTERR )
 262                 return ERROR_FLASH_OPERATION_FAILED;
 263         if( status & FLASH_PGERR )
 264                 return ERROR_FLASH_OPERATION_FAILED;
 265
 266         /* write readout protection bit */
 267         target_write_u16(target, STM32_OB_RDP, stm32x_info->option_bytes.RDP);
 268
 269         status = stm32x_wait_status_busy(bank, 10);
 270
 271         if( status & FLASH_WRPRTERR )
 272                 return ERROR_FLASH_OPERATION_FAILED;
 273         if( status & FLASH_PGERR )
 274                 return ERROR_FLASH_OPERATION_FAILED;
 275
 276         target_write_u32(target, STM32_FLASH_CR, FLASH_LOCK);
 277
 278         return ERROR_OK;
 279 }
 280
 281 int stm32x_protect_check(struct flash_bank_s *bank)
 282 {
 283         target_t *target = bank->target;
 284         stm32x_flash_bank_t *stm32x_info = bank->driver_priv;
 285
 286         u32 protection;
 287         int i, s;
 288         int num_bits;
 289
 290         if (target->state != TARGET_HALTED)
 291         {
 292                 return ERROR_TARGET_NOT_HALTED;
 293         }
 294
 295         /* medium density - each bit refers to a 4bank protection
 296          * high density - each bit refers to a 2bank protection */
 297         target_read_u32(target, STM32_FLASH_WRPR, &protection);
 298
 299         /* medium density - each protection bit is for 4 * 1K pages
 300          * high density - each protection bit is for 2 * 2K pages */
 301         num_bits = (bank->num_sectors / stm32x_info->ppage_size);
 302
 303         for (i = 0; i < num_bits; i++)
 304         {
 305                 int set = 1;
 306
 307                 if( protection & (1 << i))
 308                         set = 0;
 309
 310                 for (s = 0; s < stm32x_info->ppage_size; s++)
 311                         bank->sectors[(i * stm32x_info->ppage_size) + s].is_protected = set;
 312         }
 313
 314         return ERROR_OK;
 315 }
 316
 317 int stm32x_erase(struct flash_bank_s *bank, int first, int last)
 318 {
 319         target_t *target = bank->target;
 320         int i;
 321         u32 status;
 322
 323         if (bank->target->state != TARGET_HALTED)
 324         {
 325                 return ERROR_TARGET_NOT_HALTED;
 326         }
 327
 328         if ((first == 0) && (last == (bank->num_sectors - 1)))
 329         {
 330                 return stm32x_mass_erase(bank);
 331         }
 332
 333         /* unlock flash registers */
 334         target_write_u32(target, STM32_FLASH_KEYR, KEY1);
 335         target_write_u32(target, STM32_FLASH_KEYR, KEY2);
 336
 337         for (i = first; i <= last; i++)
 338         {
 339                 target_write_u32(target, STM32_FLASH_CR, FLASH_PER);
 340                 target_write_u32(target, STM32_FLASH_AR, bank->base + bank->sectors[i].offset);
 341                 target_write_u32(target, STM32_FLASH_CR, FLASH_PER|FLASH_STRT);
 342
 343                 status = stm32x_wait_status_busy(bank, 10);
 344
 345                 if( status & FLASH_WRPRTERR )
 346                         return ERROR_FLASH_OPERATION_FAILED;
 347                 if( status & FLASH_PGERR )
 348                         return ERROR_FLASH_OPERATION_FAILED;
 349                 bank->sectors[i].is_erased = 1;
 350         }
 351
 352         target_write_u32(target, STM32_FLASH_CR, FLASH_LOCK);
 353
 354         return ERROR_OK;
 355 }
 356
 357 int stm32x_protect(struct flash_bank_s *bank, int set, int first, int last)
 358 {
 359         stm32x_flash_bank_t *stm32x_info = NULL;
 360         target_t *target = bank->target;
 361         u16 prot_reg[4] = {0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF};
 362         int i, reg, bit;
 363         int status;
 364         u32 protection;
 365
 366         stm32x_info = bank->driver_priv;
 367
 368         if (target->state != TARGET_HALTED)
 369         {
 370                 return ERROR_TARGET_NOT_HALTED;
 371         }
 372
 373         if ((first && (first % stm32x_info->ppage_size)) || ((last + 1) && (last + 1) % stm32x_info->ppage_size))
 374         {
 375                 LOG_WARNING("sector start/end incorrect - stm32 has %dK sector protection", stm32x_info->ppage_size);
 376                 return ERROR_FLASH_SECTOR_INVALID;
 377         }
 378
 379         /* medium density - each bit refers to a 4bank protection
 380          * high density - each bit refers to a 2bank protection */
 381         target_read_u32(target, STM32_FLASH_WRPR, &protection);
 382
 383         prot_reg[0] = (u16)protection;
 384         prot_reg[1] = (u16)(protection >> 8);
 385         prot_reg[2] = (u16)(protection >> 16);
 386         prot_reg[3] = (u16)(protection >> 24);
 387
 388         for (i = first; i <= last; i++)
 389         {
 390                 reg = (i / stm32x_info->ppage_size) / 8;
 391                 bit = (i / stm32x_info->ppage_size) - (reg * 8);
 392
 393                 if( set )
 394                         prot_reg[reg] &= ~(1 << bit);
 395                 else
 396                         prot_reg[reg] |= (1 << bit);
 397         }
 398
 399         if ((status = stm32x_erase_options(bank)) != ERROR_OK)
 400                 return status;
 401
 402         stm32x_info->option_bytes.protection[0] = prot_reg[0];
 403         stm32x_info->option_bytes.protection[1] = prot_reg[1];
 404         stm32x_info->option_bytes.protection[2] = prot_reg[2];
 405         stm32x_info->option_bytes.protection[3] = prot_reg[3];
 406
 407         return stm32x_write_options(bank);
 408 }
 409
 410 int stm32x_write_block(struct flash_bank_s *bank, u8 *buffer, u32 offset, u32 count)
 411 {
 412         stm32x_flash_bank_t *stm32x_info = bank->driver_priv;
 413         target_t *target = bank->target;
 414         u32 buffer_size = 8192;
 415         working_area_t *source;
 416         u32 address = bank->base + offset;
 417         reg_param_t reg_params[4];
 418         armv7m_algorithm_t armv7m_info;
 419         int retval = ERROR_OK;
 420
 421         u8 stm32x_flash_write_code[] = {
 422                                                                         /* write: */
 423                 0xDF, 0xF8, 0x24, 0x40,         /* ldr  r4, STM32_FLASH_CR */
 424                 0x09, 0x4D,                                     /* ldr  r5, STM32_FLASH_SR */
 425                 0x4F, 0xF0, 0x01, 0x03,         /* mov  r3, #1 */
 426                 0x23, 0x60,                                     /* str  r3, [r4, #0] */
 427                 0x30, 0xF8, 0x02, 0x3B,         /* ldrh r3, [r0], #2 */
 428                 0x21, 0xF8, 0x02, 0x3B,         /* strh r3, [r1], #2 */
 429                                                                         /* busy: */
 430                 0x2B, 0x68,                                     /* ldr  r3, [r5, #0] */
 431                 0x13, 0xF0, 0x01, 0x0F,         /* tst  r3, #0x01 */
 432                 0xFB, 0xD0,                                     /* beq  busy */
 433                 0x13, 0xF0, 0x14, 0x0F,         /* tst  r3, #0x14 */
 434                 0x01, 0xD1,                                     /* bne  exit */
 435                 0x01, 0x3A,                                     /* subs r2, r2, #1 */
 436                 0xED, 0xD1,                                     /* bne  write */
 437                                                                         /* exit: */
 438                 0xFE, 0xE7,                                     /* b exit */
 439                 0x10, 0x20, 0x02, 0x40,         /* STM32_FLASH_CR:      .word 0x40022010 */
 440                 0x0C, 0x20, 0x02, 0x40          /* STM32_FLASH_SR:      .word 0x4002200C */
 441         };
 442
 443         /* flash write code */
 444         if (target_alloc_working_area(target, sizeof(stm32x_flash_write_code), &stm32x_info->write_algorithm) != ERROR_OK)
 445         {
 446                 LOG_WARNING("no working area available, can't do block memory writes");
 447                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 448         };
 449
 450         if ((retval=target_write_buffer(target, stm32x_info->write_algorithm->address, sizeof(stm32x_flash_write_code), stm32x_flash_write_code))!=ERROR_OK)
 451                 return retval;
 452
 453         /* memory buffer */
 454         while (target_alloc_working_area(target, buffer_size, &source) != ERROR_OK)
 455         {
 456                 buffer_size /= 2;
 457                 if (buffer_size <= 256)
 458                 {
 459                         /* if we already allocated the writing code, but failed to get a buffer, free the algorithm */
 460                         if (stm32x_info->write_algorithm)
 461                                 target_free_working_area(target, stm32x_info->write_algorithm);
 462
 463                         LOG_WARNING("no large enough working area available, can't do block memory writes");
 464                         return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 465                 }
 466         };
 467
 468         armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
 469         armv7m_info.core_mode = ARMV7M_MODE_ANY;
 470
 471         init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
 472         init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
 473         init_reg_param(&reg_params[2], "r2", 32, PARAM_OUT);
 474         init_reg_param(&reg_params[3], "r3", 32, PARAM_IN);
 475
 476         while (count > 0)
 477         {
 478                 u32 thisrun_count = (count > (buffer_size / 2)) ? (buffer_size / 2) : count;
 479
 480                 if ((retval = target_write_buffer(target, source->address, thisrun_count * 2, buffer))!=ERROR_OK)
 481                         break;
 482
 483                 buf_set_u32(reg_params[0].value, 0, 32, source->address);
 484                 buf_set_u32(reg_params[1].value, 0, 32, address);
 485                 buf_set_u32(reg_params[2].value, 0, 32, thisrun_count);
 486
 487                 if ((retval = target->type->run_algorithm(target, 0, NULL, 4, reg_params, stm32x_info->write_algorithm->address, \
 488                                 stm32x_info->write_algorithm->address + (sizeof(stm32x_flash_write_code) - 10), 10000, &armv7m_info)) != ERROR_OK)
 489                 {
 490                         LOG_ERROR("error executing stm32x flash write algorithm");
 491                         retval = ERROR_FLASH_OPERATION_FAILED;
 492                         break;
 493                 }
 494
 495                 if (buf_get_u32(reg_params[3].value, 0, 32) & 0x14)
 496                 {
 497                         retval = ERROR_FLASH_OPERATION_FAILED;
 498                         break;
 499                 }
 500
 501                 buffer += thisrun_count * 2;
 502                 address += thisrun_count * 2;
 503                 count -= thisrun_count;
 504         }
 505
 506         target_free_working_area(target, source);
 507         target_free_working_area(target, stm32x_info->write_algorithm);
 508
 509         destroy_reg_param(&reg_params[0]);
 510         destroy_reg_param(&reg_params[1]);
 511         destroy_reg_param(&reg_params[2]);
 512         destroy_reg_param(&reg_params[3]);
 513
 514         return retval;
 515 }
 516
 517 int stm32x_write(struct flash_bank_s *bank, u8 *buffer, u32 offset, u32 count)
 518 {
 519         target_t *target = bank->target;
 520         u32 words_remaining = (count / 2);
 521         u32 bytes_remaining = (count & 0x00000001);
 522         u32 address = bank->base + offset;
 523         u32 bytes_written = 0;
 524         u8 status;
 525         u32 retval;
 526
 527         if (bank->target->state != TARGET_HALTED)
 528         {
 529                 return ERROR_TARGET_NOT_HALTED;
 530         }
 531
 532         if (offset & 0x1)
 533         {
 534                 LOG_WARNING("offset 0x%x breaks required 2-byte alignment", offset);
 535                 return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
 536         }
 537
 538         /* unlock flash registers */
 539         target_write_u32(target, STM32_FLASH_KEYR, KEY1);
 540         target_write_u32(target, STM32_FLASH_KEYR, KEY2);
 541
 542         /* multiple half words (2-byte) to be programmed? */
 543         if (words_remaining > 0)
 544         {
 545                 /* try using a block write */
 546                 if ((retval = stm32x_write_block(bank, buffer, offset, words_remaining)) != ERROR_OK)
 547                 {
 548                         if (retval == ERROR_TARGET_RESOURCE_NOT_AVAILABLE)
 549                         {
 550                                 /* if block write failed (no sufficient working area),
 551                                  * we use normal (slow) single dword accesses */
 552                                 LOG_WARNING("couldn't use block writes, falling back to single memory accesses");
 553                         }
 554                         else if (retval == ERROR_FLASH_OPERATION_FAILED)
 555                         {
 556                                 LOG_ERROR("flash writing failed with error code: 0x%x", retval);
 557                                 return ERROR_FLASH_OPERATION_FAILED;
 558                         }
 559                 }
 560                 else
 561                 {
 562                         buffer += words_remaining * 2;
 563                         address += words_remaining * 2;
 564                         words_remaining = 0;
 565                 }
 566         }
 567
 568         while (words_remaining > 0)
 569         {
 570                 target_write_u32(target, STM32_FLASH_CR, FLASH_PG);
 571                 target_write_u16(target, address, *(u16*)(buffer + bytes_written));
 572
 573                 status = stm32x_wait_status_busy(bank, 5);
 574
 575                 if( status & FLASH_WRPRTERR )
 576                         return ERROR_FLASH_OPERATION_FAILED;
 577                 if( status & FLASH_PGERR )
 578                         return ERROR_FLASH_OPERATION_FAILED;
 579
 580                 bytes_written += 2;
 581                 words_remaining--;
 582                 address += 2;
 583         }
 584
 585         if (bytes_remaining)
 586         {
 587                 u8 last_halfword[2] = {0xff, 0xff};
 588                 int i = 0;
 589
 590                 while(bytes_remaining > 0)
 591                 {
 592                         last_halfword[i++] = *(buffer + bytes_written);
 593                         bytes_remaining--;
 594                         bytes_written++;
 595                 }
 596
 597                 target_write_u32(target, STM32_FLASH_CR, FLASH_PG);
 598                 target_write_u16(target, address, *(u16*)last_halfword);
 599
 600                 status = stm32x_wait_status_busy(bank, 5);
 601
 602                 if( status & FLASH_WRPRTERR )
 603                         return ERROR_FLASH_OPERATION_FAILED;
 604                 if( status & FLASH_PGERR )
 605                         return ERROR_FLASH_OPERATION_FAILED;
 606         }
 607
 608         target_write_u32(target, STM32_FLASH_CR, FLASH_LOCK);
 609
 610         return ERROR_OK;
 611 }
 612
 613 int stm32x_probe(struct flash_bank_s *bank)
 614 {
 615         target_t *target = bank->target;
 616         stm32x_flash_bank_t *stm32x_info = bank->driver_priv;
 617         int i;
 618         u16 num_pages;
 619         u32 device_id;
 620         int page_size;
 621
 622         if (bank->target->state != TARGET_HALTED)
 623         {
 624                 return ERROR_TARGET_NOT_HALTED;
 625         }
 626
 627         stm32x_info->probed = 0;
 628
 629         /* read stm32 device id register */
 630         target_read_u32(target, 0xE0042000, &device_id);
 631         LOG_INFO( "device id = 0x%08x", device_id );
 632
 633         switch (device_id & 0x7ff)
 634         {
 635                 case 0x410:
 636                         /* medium density - we have 1k pages
 637                          * 4 pages for a protection area */
 638                         page_size = 1024;
 639                         stm32x_info->ppage_size = 4;
 640                         break;
 641
 642                 case 0x414:
 643                         /* high density - we have 2k pages
 644                          * 2 pages for a protection area */
 645                         page_size = 2048;
 646                         stm32x_info->ppage_size = 2;
 647                         break;
 648
 649                 default:
 650                         LOG_WARNING( "Cannot identify target as a STM32 family." );
 651                         return ERROR_FLASH_OPERATION_FAILED;
 652         }
 653
 654         /* get flash size from target */
 655         if (target_read_u16(target, 0x1FFFF7E0, &num_pages) != ERROR_OK)
 656         {
 657                 /* failed reading flash size, default to 128k */
 658                 LOG_WARNING( "STM32 flash size failed, probe inaccurate - assuming 128k flash" );
 659                 num_pages = 128;
 660         }
 661
 662         /* check for early silicon rev A */
 663         if ((device_id >> 16) == 0 )
 664         {
 665                 /* number of sectors incorrect on revA */
 666                 LOG_WARNING( "STM32 Rev A Silicon detected, probe inaccurate - assuming 128k flash" );
 667                 num_pages = 128;
 668         }
 669
 670         LOG_INFO( "flash size = %dkbytes", num_pages );
 671
 672         /* calculate numbers of pages */
 673         num_pages /= (page_size / 1024);
 674
 675         bank->base = 0x08000000;
 676         bank->size = (num_pages * page_size);
 677         bank->num_sectors = num_pages;
 678         bank->sectors = malloc(sizeof(flash_sector_t) * num_pages);
 679
 680         for (i = 0; i < num_pages; i++)
 681         {
 682                 bank->sectors[i].offset = i * page_size;
 683                 bank->sectors[i].size = page_size;
 684                 bank->sectors[i].is_erased = -1;
 685                 bank->sectors[i].is_protected = 1;
 686         }
 687
 688         stm32x_info->probed = 1;
 689
 690         return ERROR_OK;
 691 }
 692
 693 int stm32x_auto_probe(struct flash_bank_s *bank)
 694 {
 695         stm32x_flash_bank_t *stm32x_info = bank->driver_priv;
 696         if (stm32x_info->probed)
 697                 return ERROR_OK;
 698         return stm32x_probe(bank);
 699 }
 700
 701 int stm32x_handle_part_id_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 702 {
 703         return ERROR_OK;
 704 }
 705
 706 int stm32x_info(struct flash_bank_s *bank, char *buf, int buf_size)
 707 {
 708         snprintf(buf, buf_size, "stm32x flash driver info" );
 709         return ERROR_OK;
 710 }
 711
 712 int stm32x_handle_lock_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 713 {
 714         flash_bank_t *bank;
 715         target_t *target = NULL;
 716         stm32x_flash_bank_t *stm32x_info = NULL;
 717
 718         if (argc < 1)
 719         {
 720                 command_print(cmd_ctx, "stm32x lock <bank>");
 721                 return ERROR_OK;
 722         }
 723
 724         bank = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
 725         if (!bank)
 726         {
 727                 command_print(cmd_ctx, "flash bank '#%s' is out of bounds", args[0]);
 728                 return ERROR_OK;
 729         }
 730
 731         stm32x_info = bank->driver_priv;
 732
 733         target = bank->target;
 734
 735         if (target->state != TARGET_HALTED)
 736         {
 737                 return ERROR_TARGET_NOT_HALTED;
 738         }
 739
 740         if (stm32x_erase_options(bank) != ERROR_OK)
 741         {
 742                 command_print(cmd_ctx, "stm32x failed to erase options");
 743                 return ERROR_OK;
 744         }
 745
 746         /* set readout protection */
 747         stm32x_info->option_bytes.RDP = 0;
 748
 749         if (stm32x_write_options(bank) != ERROR_OK)
 750         {
 751                 command_print(cmd_ctx, "stm32x failed to lock device");
 752                 return ERROR_OK;
 753         }
 754
 755         command_print(cmd_ctx, "stm32x locked");
 756
 757         return ERROR_OK;
 758 }
 759
 760 int stm32x_handle_unlock_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 761 {
 762         flash_bank_t *bank;
 763         target_t *target = NULL;
 764         stm32x_flash_bank_t *stm32x_info = NULL;
 765
 766         if (argc < 1)
 767         {
 768                 command_print(cmd_ctx, "stm32x unlock <bank>");
 769                 return ERROR_OK;
 770         }
 771
 772         bank = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
 773         if (!bank)
 774         {
 775                 command_print(cmd_ctx, "flash bank '#%s' is out of bounds", args[0]);
 776                 return ERROR_OK;
 777         }
 778
 779         stm32x_info = bank->driver_priv;
 780
 781         target = bank->target;
 782
 783         if (target->state != TARGET_HALTED)
 784         {
 785                 return ERROR_TARGET_NOT_HALTED;
 786         }
 787
 788         if (stm32x_erase_options(bank) != ERROR_OK)
 789         {
 790                 command_print(cmd_ctx, "stm32x failed to unlock device");
 791                 return ERROR_OK;
 792         }
 793
 794         if (stm32x_write_options(bank) != ERROR_OK)
 795         {
 796                 command_print(cmd_ctx, "stm32x failed to lock device");
 797                 return ERROR_OK;
 798         }
 799
 800         command_print(cmd_ctx, "stm32x unlocked");
 801
 802         return ERROR_OK;
 803 }
 804
 805 int stm32x_handle_options_read_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 806 {
 807         flash_bank_t *bank;
 808         u32 optionbyte;
 809         target_t *target = NULL;
 810         stm32x_flash_bank_t *stm32x_info = NULL;
 811
 812         if (argc < 1)
 813         {
 814                 command_print(cmd_ctx, "stm32x options_read <bank>");
 815                 return ERROR_OK;
 816         }
 817
 818         bank = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
 819         if (!bank)
 820         {
 821                 command_print(cmd_ctx, "flash bank '#%s' is out of bounds", args[0]);
 822                 return ERROR_OK;
 823         }
 824
 825         stm32x_info = bank->driver_priv;
 826
 827         target = bank->target;
 828
 829         if (target->state != TARGET_HALTED)
 830         {
 831                 return ERROR_TARGET_NOT_HALTED;
 832         }
 833
 834         target_read_u32(target, STM32_FLASH_OBR, &optionbyte);
 835         command_print(cmd_ctx, "Option Byte: 0x%x", optionbyte);
 836
 837         if (buf_get_u32((u8*)&optionbyte, OPT_ERROR, 1))
 838                 command_print(cmd_ctx, "Option Byte Complement Error");
 839
 840         if (buf_get_u32((u8*)&optionbyte, OPT_READOUT, 1))
 841                 command_print(cmd_ctx, "Readout Protection On");
 842         else
 843                 command_print(cmd_ctx, "Readout Protection Off");
 844
 845         if (buf_get_u32((u8*)&optionbyte, OPT_RDWDGSW, 1))
 846                 command_print(cmd_ctx, "Software Watchdog");
 847         else
 848                 command_print(cmd_ctx, "Hardware Watchdog");
 849
 850         if (buf_get_u32((u8*)&optionbyte, OPT_RDRSTSTOP, 1))
 851                 command_print(cmd_ctx, "Stop: No reset generated");
 852         else
 853                 command_print(cmd_ctx, "Stop: Reset generated");
 854
 855         if (buf_get_u32((u8*)&optionbyte, OPT_RDRSTSTDBY, 1))
 856                 command_print(cmd_ctx, "Standby: No reset generated");
 857         else
 858                 command_print(cmd_ctx, "Standby: Reset generated");
 859
 860         return ERROR_OK;
 861 }
 862
 863 int stm32x_handle_options_write_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 864 {
 865         flash_bank_t *bank;
 866         target_t *target = NULL;
 867         stm32x_flash_bank_t *stm32x_info = NULL;
 868         u16 optionbyte = 0xF8;
 869
 870         if (argc < 4)
 871         {
 872                 command_print(cmd_ctx, "stm32x options_write <bank> <SWWDG|HWWDG> <RSTSTNDBY|NORSTSTNDBY> <RSTSTOP|NORSTSTOP>");
 873                 return ERROR_OK;
 874         }
 875
 876         bank = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
 877         if (!bank)
 878         {
 879                 command_print(cmd_ctx, "flash bank '#%s' is out of bounds", args[0]);
 880                 return ERROR_OK;
 881         }
 882
 883         stm32x_info = bank->driver_priv;
 884
 885         target = bank->target;
 886
 887         if (target->state != TARGET_HALTED)
 888         {
 889                 return ERROR_TARGET_NOT_HALTED;
 890         }
 891
 892         if (strcmp(args[1], "SWWDG") == 0)
 893         {
 894                 optionbyte |= (1<<0);
 895         }
 896         else
 897         {
 898                 optionbyte &= ~(1<<0);
 899         }
 900
 901         if (strcmp(args[2], "NORSTSTNDBY") == 0)
 902         {
 903                 optionbyte |= (1<<1);
 904         }
 905         else
 906         {
 907                 optionbyte &= ~(1<<1);
 908         }
 909
 910         if (strcmp(args[3], "NORSTSTOP") == 0)
 911         {
 912                 optionbyte |= (1<<2);
 913         }
 914         else
 915         {
 916                 optionbyte &= ~(1<<2);
 917         }
 918
 919         if (stm32x_erase_options(bank) != ERROR_OK)
 920         {
 921                 command_print(cmd_ctx, "stm32x failed to erase options");
 922                 return ERROR_OK;
 923         }
 924
 925         stm32x_info->option_bytes.user_options = optionbyte;
 926
 927         if (stm32x_write_options(bank) != ERROR_OK)
 928         {
 929                 command_print(cmd_ctx, "stm32x failed to write options");
 930                 return ERROR_OK;
 931         }
 932
 933         command_print(cmd_ctx, "stm32x write options complete");
 934
 935         return ERROR_OK;
 936 }
 937
 938 int stm32x_mass_erase(struct flash_bank_s *bank)
 939 {
 940         target_t *target = bank->target;
 941         u32 status;
 942
 943         if (target->state != TARGET_HALTED)
 944         {
 945                 return ERROR_TARGET_NOT_HALTED;
 946         }
 947
 948         /* unlock option flash registers */
 949         target_write_u32(target, STM32_FLASH_KEYR, KEY1);
 950         target_write_u32(target, STM32_FLASH_KEYR, KEY2);
 951
 952         /* mass erase flash memory */
 953         target_write_u32(target, STM32_FLASH_CR, FLASH_MER);
 954         target_write_u32(target, STM32_FLASH_CR, FLASH_MER|FLASH_STRT);
 955
 956         status = stm32x_wait_status_busy(bank, 10);
 957
 958         target_write_u32(target, STM32_FLASH_CR, FLASH_LOCK);
 959
 960         if( status & FLASH_WRPRTERR )
 961         {
 962                 LOG_ERROR("stm32x device protected");
 963                 return ERROR_OK;
 964         }
 965
 966         if( status & FLASH_PGERR )
 967         {
 968                 LOG_ERROR("stm32x device programming failed");
 969                 return ERROR_OK;
 970         }
 971
 972         return ERROR_OK;
 973 }
 974
 975 int stm32x_handle_mass_erase_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 976 {
 977         flash_bank_t *bank;
 978         int i;
 979
 980         if (argc < 1)
 981         {
 982                 command_print(cmd_ctx, "stm32x mass_erase <bank>");
 983                 return ERROR_OK;
 984         }
 985
 986         bank = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
 987         if (!bank)
 988         {
 989                 command_print(cmd_ctx, "flash bank '#%s' is out of bounds", args[0]);
 990                 return ERROR_OK;
 991         }
 992
 993         if (stm32x_mass_erase(bank) == ERROR_OK)
 994         {
 995                 /* set all sectors as erased */
 996                 for (i = 0; i < bank->num_sectors; i++)
 997                 {
 998                         bank->sectors[i].is_erased = 1;
 999                 }
1000
1001                 command_print(cmd_ctx, "stm32x mass erase complete");
1002         }
1003         else
1004         {
1005                 command_print(cmd_ctx, "stm32x mass erase failed");
1006         }
1007
1008         return ERROR_OK;
1009 }