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   1 /***************************************************************************
   2  *   Copyright (C) 2009 by                                                 *
   3  *   Rolf Meeser <rolfm_9dq@yahoo.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
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25
  26 #include "image.h"
  27 #include "flash.h"
  28 #include <helper/binarybuffer.h>
  29 #include <target/armv4_5.h>
  30 #include <target/algorithm.h>
  31
  32
  33 /* 1024 bytes */
  34 #define KiB                 1024
  35
  36 /* Some flash constants */
  37 #define FLASH_PAGE_SIZE     512     /* bytes */
  38 #define FLASH_ERASE_TIME    100000  /* microseconds */
  39 #define FLASH_PROGRAM_TIME  1000    /* microseconds */
  40
  41 /* Chip ID / Feature Registers */
  42 #define CHIPID          0xE0000000  /* Chip ID */
  43 #define FEAT0           0xE0000100  /* Chip feature 0 */
  44 #define FEAT1           0xE0000104  /* Chip feature 1 */
  45 #define FEAT2           0xE0000108  /* Chip feature 2 (contains flash size indicator) */
  46 #define FEAT3           0xE000010C  /* Chip feature 3 */
  47
  48 #define EXPECTED_CHIPID 0x209CE02B  /* Chip ID of all LPC2900 devices */
  49
  50 /* Flash/EEPROM Control Registers */
  51 #define FCTR            0x20200000  /* Flash control */
  52 #define FPTR            0x20200008  /* Flash program-time */
  53 #define FTCTR           0x2020000C  /* Flash test control */
  54 #define FBWST           0x20200010  /* Flash bridge wait-state */
  55 #define FCRA            0x2020001C  /* Flash clock divider */
  56 #define FMSSTART        0x20200020  /* Flash Built-In Selft Test start address */
  57 #define FMSSTOP         0x20200024  /* Flash Built-In Selft Test stop address */
  58 #define FMS16           0x20200028  /* Flash 16-bit signature */
  59 #define FMSW0           0x2020002C  /* Flash 128-bit signature Word 0 */
  60 #define FMSW1           0x20200030  /* Flash 128-bit signature Word 1 */
  61 #define FMSW2           0x20200034  /* Flash 128-bit signature Word 2 */
  62 #define FMSW3           0x20200038  /* Flash 128-bit signature Word 3 */
  63
  64 #define EECMD           0x20200080  /* EEPROM command */
  65 #define EEADDR          0x20200084  /* EEPROM address */
  66 #define EEWDATA         0x20200088  /* EEPROM write data */
  67 #define EERDATA         0x2020008C  /* EEPROM read data */
  68 #define EEWSTATE        0x20200090  /* EEPROM wait state */
  69 #define EECLKDIV        0x20200094  /* EEPROM clock divider */
  70 #define EEPWRDWN        0x20200098  /* EEPROM power-down/start */
  71 #define EEMSSTART       0x2020009C  /* EEPROM BIST start address */
  72 #define EEMSSTOP        0x202000A0  /* EEPROM BIST stop address */
  73 #define EEMSSIG         0x202000A4  /* EEPROM 24-bit BIST signature */
  74
  75 #define INT_CLR_ENABLE  0x20200FD8  /* Flash/EEPROM interrupt clear enable */
  76 #define INT_SET_ENABLE  0x20200FDC  /* Flash/EEPROM interrupt set enable */
  77 #define INT_STATUS      0x20200FE0  /* Flash/EEPROM interrupt status */
  78 #define INT_ENABLE      0x20200FE4  /* Flash/EEPROM interrupt enable */
  79 #define INT_CLR_STATUS  0x20200FE8  /* Flash/EEPROM interrupt clear status */
  80 #define INT_SET_STATUS  0x20200FEC  /* Flash/EEPROM interrupt set status */
  81
  82 /* Interrupt sources */
  83 #define INTSRC_END_OF_PROG    (1 << 28)
  84 #define INTSRC_END_OF_BIST    (1 << 27)
  85 #define INTSRC_END_OF_RDWR    (1 << 26)
  86 #define INTSRC_END_OF_MISR    (1 << 2)
  87 #define INTSRC_END_OF_BURN    (1 << 1)
  88 #define INTSRC_END_OF_ERASE   (1 << 0)
  89
  90
  91 /* FCTR bits */
  92 #define FCTR_FS_LOADREQ       (1 << 15)
  93 #define FCTR_FS_CACHECLR      (1 << 14)
  94 #define FCTR_FS_CACHEBYP      (1 << 13)
  95 #define FCTR_FS_PROGREQ       (1 << 12)
  96 #define FCTR_FS_RLS           (1 << 11)
  97 #define FCTR_FS_PDL           (1 << 10)
  98 #define FCTR_FS_PD            (1 << 9)
  99 #define FCTR_FS_WPB           (1 << 7)
 100 #define FCTR_FS_ISS           (1 << 6)
 101 #define FCTR_FS_RLD           (1 << 5)
 102 #define FCTR_FS_DCR           (1 << 4)
 103 #define FCTR_FS_WEB           (1 << 2)
 104 #define FCTR_FS_WRE           (1 << 1)
 105 #define FCTR_FS_CS            (1 << 0)
 106 /* FPTR bits */
 107 #define FPTR_EN_T             (1 << 15)
 108 /* FTCTR bits */
 109 #define FTCTR_FS_BYPASS_R     (1 << 29)
 110 #define FTCTR_FS_BYPASS_W     (1 << 28)
 111 /* FMSSTOP bits */
 112 #define FMSSTOP_MISR_START    (1 << 17)
 113 /* EEMSSTOP bits */
 114 #define EEMSSTOP_STRTBIST     (1 << 31)
 115
 116 /* Index sector */
 117 #define ISS_CUSTOMER_START1   (0x830)
 118 #define ISS_CUSTOMER_END1     (0xA00)
 119 #define ISS_CUSTOMER_SIZE1    (ISS_CUSTOMER_END1 - ISS_CUSTOMER_START1)
 120 #define ISS_CUSTOMER_NWORDS1  (ISS_CUSTOMER_SIZE1 / 4)
 121 #define ISS_CUSTOMER_START2   (0xA40)
 122 #define ISS_CUSTOMER_END2     (0xC00)
 123 #define ISS_CUSTOMER_SIZE2    (ISS_CUSTOMER_END2 - ISS_CUSTOMER_START2)
 124 #define ISS_CUSTOMER_NWORDS2  (ISS_CUSTOMER_SIZE2 / 4)
 125 #define ISS_CUSTOMER_SIZE     (ISS_CUSTOMER_SIZE1 + ISS_CUSTOMER_SIZE2)
 126
 127
 128
 129 /**
 130  * Private data for \c lpc2900 flash driver.
 131  */
 132 struct lpc2900_flash_bank
 133 {
 134         /**
 135          * Holds the value read from CHIPID register.
 136          * The driver will not load if the chipid doesn't match the expected
 137          * value of 0x209CE02B of the LPC2900 family. A probe will only be done
 138          * if the chipid does not yet contain the expected value.
 139          */
 140         uint32_t chipid;
 141
 142         /**
 143          * String holding device name.
 144          * This string is set by the probe function to the type number of the
 145          * device. It takes the form "LPC29xx".
 146          */
 147         char * target_name;
 148
 149         /**
 150          * System clock frequency.
 151          * Holds the clock frequency in Hz, as passed by the configuration file
 152          * to the <tt>flash bank</tt> command.
 153          */
 154         uint32_t clk_sys_fmc;
 155
 156         /**
 157          * Flag to indicate that dangerous operations are possible.
 158          * This flag can be set by passing the correct password to the
 159          * <tt>lpc2900 password</tt> command. If set, other dangerous commands,
 160          * which operate on the index sector, can be executed.
 161          */
 162         uint32_t risky;
 163
 164         /**
 165          * Maximum contiguous block of internal SRAM (bytes).
 166          * Autodetected by the driver. Not the total amount of SRAM, only the
 167          * the largest \em contiguous block!
 168          */
 169         uint32_t max_ram_block;
 170
 171 };
 172
 173
 174 static uint32_t lpc2900_wait_status(struct flash_bank *bank, uint32_t mask, int timeout);
 175 static void lpc2900_setup(struct flash_bank *bank);
 176 static uint32_t lpc2900_is_ready(struct flash_bank *bank);
 177 static uint32_t lpc2900_read_security_status(struct flash_bank *bank);
 178 static uint32_t lpc2900_run_bist128(struct flash_bank *bank,
 179                                     uint32_t addr_from, uint32_t addr_to,
 180                                     uint32_t (*signature)[4] );
 181 static uint32_t lpc2900_address2sector(struct flash_bank *bank, uint32_t offset);
 182 static uint32_t lpc2900_calc_tr( uint32_t clock, uint32_t time );
 183
 184
 185 /***********************  Helper functions  **************************/
 186
 187
 188 /**
 189  * Wait for an event in mask to occur in INT_STATUS.
 190  *
 191  * Return when an event occurs, or after a timeout.
 192  *
 193  * @param[in] bank Pointer to the flash bank descriptor
 194  * @param[in] mask Mask to be used for INT_STATUS
 195  * @param[in] timeout Timeout in ms
 196  */
 197 static uint32_t lpc2900_wait_status( struct flash_bank *bank,
 198                                      uint32_t mask,
 199                                      int timeout )
 200 {
 201         uint32_t int_status;
 202         struct target *target = bank->target;
 203
 204
 205         do
 206         {
 207                 alive_sleep(1);
 208                 timeout--;
 209                 target_read_u32(target, INT_STATUS, &int_status);
 210         }
 211         while( ((int_status & mask) == 0) && (timeout != 0) );
 212
 213         if (timeout == 0)
 214         {
 215                 LOG_DEBUG("Timeout!");
 216                 return ERROR_FLASH_OPERATION_FAILED;
 217         }
 218
 219         return ERROR_OK;
 220 }
 221
 222
 223
 224 /**
 225  * Set up the flash for erase/program operations.
 226  *
 227  * Enable the flash, and set the correct CRA clock of 66 kHz.
 228  *
 229  * @param bank Pointer to the flash bank descriptor
 230  */
 231 static void lpc2900_setup( struct flash_bank *bank )
 232 {
 233         uint32_t fcra;
 234         struct lpc2900_flash_bank *lpc2900_info = bank->driver_priv;
 235
 236
 237         /* Power up the flash block */
 238         target_write_u32( bank->target, FCTR, FCTR_FS_WEB | FCTR_FS_CS );
 239
 240
 241         fcra = (lpc2900_info->clk_sys_fmc / (3 * 66000)) - 1;
 242         target_write_u32( bank->target, FCRA, fcra );
 243 }
 244
 245
 246
 247 /**
 248  * Check if device is ready.
 249  *
 250  * Check if device is ready for flash operation:
 251  * Must have been successfully probed.
 252  * Must be halted.
 253  */
 254 static uint32_t lpc2900_is_ready( struct flash_bank *bank )
 255 {
 256         struct lpc2900_flash_bank *lpc2900_info = bank->driver_priv;
 257
 258         if( lpc2900_info->chipid != EXPECTED_CHIPID )
 259         {
 260                 return ERROR_FLASH_BANK_NOT_PROBED;
 261         }
 262
 263         if( bank->target->state != TARGET_HALTED )
 264         {
 265                 LOG_ERROR( "Target not halted" );
 266                 return ERROR_TARGET_NOT_HALTED;
 267         }
 268
 269         return ERROR_OK;
 270 }
 271
 272
 273 /**
 274  * Read the status of sector security from the index sector.
 275  *
 276  * @param bank Pointer to the flash bank descriptor
 277  */
 278 static uint32_t lpc2900_read_security_status( struct flash_bank *bank )
 279 {
 280         uint32_t status;
 281         if( (status = lpc2900_is_ready( bank )) != ERROR_OK )
 282         {
 283                 return status;
 284         }
 285
 286         struct target *target = bank->target;
 287
 288         /* Enable ISS access */
 289         target_write_u32(target, FCTR, FCTR_FS_CS | FCTR_FS_WEB | FCTR_FS_ISS);
 290
 291         /* Read the relevant block of memory from the ISS sector */
 292         uint32_t iss_secured_field[ 0x230/16 ][ 4 ];
 293         target_read_memory(target, bank->base + 0xC00, 4, 0x230/4,
 294                                    (uint8_t *)iss_secured_field);
 295
 296         /* Disable ISS access */
 297         target_write_u32(target, FCTR, FCTR_FS_CS | FCTR_FS_WEB);
 298
 299         /* Check status of each sector. Note that the sector numbering in the LPC2900
 300          * is different from the logical sector numbers used in OpenOCD!
 301          * Refer to the user manual for details.
 302          *
 303          * All zeros (16x 0x00) are treated as a secured sector (is_protected = 1)
 304          * All ones (16x 0xFF) are treated as a non-secured sector (is_protected = 0)
 305          * Anything else is undefined (is_protected = -1). This is treated as
 306          * a protected sector!
 307          */
 308         int sector;
 309         int index;
 310         for( sector = 0; sector < bank->num_sectors; sector++ )
 311         {
 312                 /* Convert logical sector number to physical sector number */
 313                 if( sector <= 4 )
 314                 {
 315                         index = sector + 11;
 316                 }
 317                 else if( sector <= 7 )
 318                 {
 319                         index = sector + 27;
 320                 }
 321                 else
 322                 {
 323                         index = sector - 8;
 324                 }
 325
 326                 bank->sectors[sector].is_protected = -1;
 327
 328                 if (
 329                     (iss_secured_field[index][0] == 0x00000000) &&
 330                     (iss_secured_field[index][1] == 0x00000000) &&
 331                     (iss_secured_field[index][2] == 0x00000000) &&
 332                     (iss_secured_field[index][3] == 0x00000000) )
 333                 {
 334                         bank->sectors[sector].is_protected = 1;
 335                 }
 336
 337                 if (
 338                     (iss_secured_field[index][0] == 0xFFFFFFFF) &&
 339                     (iss_secured_field[index][1] == 0xFFFFFFFF) &&
 340                     (iss_secured_field[index][2] == 0xFFFFFFFF) &&
 341                     (iss_secured_field[index][3] == 0xFFFFFFFF) )
 342                 {
 343                         bank->sectors[sector].is_protected = 0;
 344                 }
 345         }
 346
 347         return ERROR_OK;
 348 }
 349
 350
 351 /**
 352  * Use BIST to calculate a 128-bit hash value over a range of flash.
 353  *
 354  * @param bank Pointer to the flash bank descriptor
 355  * @param addr_from
 356  * @param addr_to
 357  * @param signature
 358  */
 359 static uint32_t lpc2900_run_bist128(struct flash_bank *bank,
 360                                     uint32_t addr_from,
 361                                     uint32_t addr_to,
 362                                     uint32_t (*signature)[4] )
 363 {
 364         struct target *target = bank->target;
 365
 366         /* Clear END_OF_MISR interrupt status */
 367         target_write_u32( target, INT_CLR_STATUS, INTSRC_END_OF_MISR );
 368
 369         /* Start address */
 370         target_write_u32( target, FMSSTART, addr_from >> 4);
 371         /* End address, and issue start command */
 372         target_write_u32( target, FMSSTOP, (addr_to >> 4) | FMSSTOP_MISR_START );
 373
 374         /* Poll for end of operation. Calculate a reasonable timeout. */
 375         if( lpc2900_wait_status( bank, INTSRC_END_OF_MISR, 1000 ) != ERROR_OK )
 376         {
 377                 return ERROR_FLASH_OPERATION_FAILED;
 378         }
 379
 380         /* Return the signature */
 381         target_read_memory( target, FMSW0, 4, 4, (uint8_t *)signature );
 382
 383         return ERROR_OK;
 384 }
 385
 386
 387 /**
 388  * Return sector number for given address.
 389  *
 390  * Return the (logical) sector number for a given relative address.
 391  * No sanity check is done. It assumed that the address is valid.
 392  *
 393  * @param bank Pointer to the flash bank descriptor
 394  * @param offset Offset address relative to bank start
 395  */
 396 static uint32_t lpc2900_address2sector( struct flash_bank *bank,
 397                                         uint32_t offset )
 398 {
 399         uint32_t address = bank->base + offset;
 400
 401
 402         /* Run through all sectors of this bank */
 403         int sector;
 404         for( sector = 0; sector < bank->num_sectors; sector++ )
 405         {
 406                 /* Return immediately if address is within the current sector */
 407                 if( address < (bank->sectors[sector].offset + bank->sectors[sector].size) )
 408                 {
 409                         return sector;
 410                 }
 411         }
 412
 413         /* We should never come here. If we do, return an arbitrary sector number. */
 414         return 0;
 415 }
 416
 417
 418
 419
 420 /**
 421  * Write one page to the index sector.
 422  *
 423  * @param bank Pointer to the flash bank descriptor
 424  * @param pagenum Page number (0...7)
 425  * @param page Page array (FLASH_PAGE_SIZE bytes)
 426  */
 427 static int lpc2900_write_index_page( struct flash_bank *bank,
 428                                      int pagenum,
 429                                      uint8_t (*page)[FLASH_PAGE_SIZE] )
 430 {
 431         /* Only pages 4...7 are user writable */
 432         if ((pagenum < 4) || (pagenum > 7))
 433         {
 434                 LOG_ERROR("Refuse to burn index sector page %d", pagenum);
 435                 return ERROR_COMMAND_ARGUMENT_INVALID;
 436         }
 437
 438         /* Get target, and check if it's halted */
 439         struct target *target = bank->target;
 440         if( target->state != TARGET_HALTED )
 441         {
 442                 LOG_ERROR( "Target not halted" );
 443                 return ERROR_TARGET_NOT_HALTED;
 444         }
 445
 446         /* Private info */
 447         struct lpc2900_flash_bank *lpc2900_info = bank->driver_priv;
 448
 449         /* Enable flash block and set the correct CRA clock of 66 kHz */
 450         lpc2900_setup( bank );
 451
 452         /* Un-protect the index sector */
 453         target_write_u32( target, bank->base, 0 );
 454         target_write_u32( target, FCTR,
 455                           FCTR_FS_LOADREQ | FCTR_FS_WPB | FCTR_FS_ISS |
 456                           FCTR_FS_WEB | FCTR_FS_WRE | FCTR_FS_CS );
 457
 458         /* Set latch load mode */
 459         target_write_u32( target, FCTR,
 460                           FCTR_FS_ISS | FCTR_FS_WEB | FCTR_FS_WRE | FCTR_FS_CS );
 461
 462         /* Write whole page to flash data latches */
 463         if( target_write_memory( target,
 464                                  bank->base + pagenum * FLASH_PAGE_SIZE,
 465                                  4, FLASH_PAGE_SIZE / 4, (uint8_t *)page) != ERROR_OK )
 466         {
 467                 LOG_ERROR("Index sector write failed @ page %d", pagenum);
 468                 target_write_u32( target, FCTR, FCTR_FS_CS | FCTR_FS_WEB );
 469
 470                 return ERROR_FLASH_OPERATION_FAILED;
 471         }
 472
 473         /* Clear END_OF_BURN interrupt status */
 474         target_write_u32( target, INT_CLR_STATUS, INTSRC_END_OF_BURN );
 475
 476         /* Set the program/erase time to FLASH_PROGRAM_TIME */
 477         target_write_u32(target, FPTR,
 478                          FPTR_EN_T | lpc2900_calc_tr( lpc2900_info->clk_sys_fmc,
 479                                                       FLASH_PROGRAM_TIME ));
 480
 481         /* Trigger flash write */
 482         target_write_u32( target, FCTR,
 483                           FCTR_FS_PROGREQ | FCTR_FS_ISS |
 484                           FCTR_FS_WPB | FCTR_FS_WRE | FCTR_FS_CS );
 485
 486         /* Wait for the end of the write operation. If it's not over after one
 487          * second, something went dreadfully wrong... :-(
 488          */
 489         if (lpc2900_wait_status(bank, INTSRC_END_OF_BURN, 1000) != ERROR_OK)
 490         {
 491                 LOG_ERROR("Index sector write failed @ page %d", pagenum);
 492                 target_write_u32(target, FCTR, FCTR_FS_CS | FCTR_FS_WEB);
 493
 494                 return ERROR_FLASH_OPERATION_FAILED;
 495         }
 496
 497         target_write_u32( target, FCTR, FCTR_FS_CS | FCTR_FS_WEB );
 498
 499         return ERROR_OK;
 500 }
 501
 502
 503
 504 /**
 505  * Calculate FPTR.TR register value for desired program/erase time.
 506  *
 507  * @param clock System clock in Hz
 508  * @param time Program/erase time in µs
 509  */
 510 static uint32_t lpc2900_calc_tr( uint32_t clock, uint32_t time )
 511 {
 512         /*           ((time[µs]/1e6) * f[Hz]) + 511
 513          * FPTR.TR = -------------------------------
 514          *                         512
 515          *
 516          * The result is the
 517          */
 518
 519         uint32_t tr_val = (uint32_t)((((time / 1e6) * clock) + 511.0) / 512.0);
 520
 521         return tr_val;
 522 }
 523
 524
 525 /***********************  Private flash commands  **************************/
 526
 527
 528 /**
 529  * Command to determine the signature of the whole flash.
 530  *
 531  * Uses the Built-In-Self-Test (BIST) to generate a 128-bit hash value
 532  * of the flash content.
 533  */
 534 COMMAND_HANDLER(lpc2900_handle_signature_command)
 535 {
 536         uint32_t status;
 537         uint32_t signature[4];
 538
 539
 540         if( CMD_ARGC < 1 )
 541         {
 542                 LOG_WARNING( "Too few arguments. Call: lpc2900 signature <bank#>" );
 543                 return ERROR_FLASH_BANK_INVALID;
 544         }
 545
 546         struct flash_bank *bank;
 547         int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
 548         if (ERROR_OK != retval)
 549                 return retval;
 550
 551         if( bank->target->state != TARGET_HALTED )
 552         {
 553                 LOG_ERROR( "Target not halted" );
 554                 return ERROR_TARGET_NOT_HALTED;
 555         }
 556
 557         /* Run BIST over whole flash range */
 558         if( (status = lpc2900_run_bist128( bank,
 559                                            bank->base,
 560                                            bank->base + (bank->size - 1),
 561                                            &signature)
 562                                          ) != ERROR_OK )
 563         {
 564                 return status;
 565         }
 566
 567         command_print( CMD_CTX, "signature: 0x%8.8" PRIx32
 568                                           ":0x%8.8" PRIx32
 569                                           ":0x%8.8" PRIx32
 570                                           ":0x%8.8" PRIx32,
 571                       signature[3], signature[2], signature[1], signature[0] );
 572
 573         return ERROR_OK;
 574 }
 575
 576
 577
 578 /**
 579  * Store customer info in file.
 580  *
 581  * Read customer info from index sector, and store that block of data into
 582  * a disk file. The format is binary.
 583  */
 584 COMMAND_HANDLER(lpc2900_handle_read_custom_command)
 585 {
 586         if( CMD_ARGC < 2 )
 587         {
 588                 return ERROR_COMMAND_SYNTAX_ERROR;
 589         }
 590
 591         struct flash_bank *bank;
 592         int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
 593         if (ERROR_OK != retval)
 594                 return retval;
 595
 596         struct lpc2900_flash_bank *lpc2900_info = bank->driver_priv;
 597         lpc2900_info->risky = 0;
 598
 599         /* Get target, and check if it's halted */
 600         struct target *target = bank->target;
 601         if( target->state != TARGET_HALTED )
 602         {
 603                 LOG_ERROR( "Target not halted" );
 604                 return ERROR_TARGET_NOT_HALTED;
 605         }
 606
 607         /* Storage for customer info. Read in two parts */
 608         uint32_t customer[ ISS_CUSTOMER_NWORDS1 + ISS_CUSTOMER_NWORDS2 ];
 609
 610         /* Enable access to index sector */
 611         target_write_u32( target, FCTR, FCTR_FS_CS | FCTR_FS_WEB | FCTR_FS_ISS );
 612
 613         /* Read two parts */
 614         target_read_memory( target, bank->base+ISS_CUSTOMER_START1, 4,
 615                                     ISS_CUSTOMER_NWORDS1,
 616                                     (uint8_t *)&customer[0] );
 617         target_read_memory( target, bank->base+ISS_CUSTOMER_START2, 4,
 618                                     ISS_CUSTOMER_NWORDS2,
 619                                     (uint8_t *)&customer[ISS_CUSTOMER_NWORDS1] );
 620
 621         /* Deactivate access to index sector */
 622         target_write_u32( target, FCTR, FCTR_FS_CS | FCTR_FS_WEB );
 623
 624         /* Try and open the file */
 625         struct fileio fileio;
 626         const char *filename = CMD_ARGV[1];
 627         int ret = fileio_open( &fileio, filename, FILEIO_WRITE, FILEIO_BINARY );
 628         if( ret != ERROR_OK )
 629         {
 630                 LOG_WARNING( "Could not open file %s", filename );
 631                 return ret;
 632         }
 633
 634         size_t nwritten;
 635         ret = fileio_write( &fileio, sizeof(customer),
 636                         (const uint8_t *)customer, &nwritten );
 637         if( ret != ERROR_OK )
 638         {
 639                 LOG_ERROR( "Write operation to file %s failed", filename );
 640                 fileio_close( &fileio );
 641                 return ret;
 642         }
 643
 644         fileio_close( &fileio );
 645
 646         return ERROR_OK;
 647 }
 648
 649
 650
 651
 652 /**
 653  * Enter password to enable potentially dangerous options.
 654  */
 655 COMMAND_HANDLER(lpc2900_handle_password_command)
 656 {
 657         if (CMD_ARGC < 2)
 658         {
 659                 return ERROR_COMMAND_SYNTAX_ERROR;
 660         }
 661
 662         struct flash_bank *bank;
 663         int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
 664         if (ERROR_OK != retval)
 665                 return retval;
 666
 667         struct lpc2900_flash_bank *lpc2900_info = bank->driver_priv;
 668
 669 #define ISS_PASSWORD "I_know_what_I_am_doing"
 670
 671         lpc2900_info->risky = !strcmp( CMD_ARGV[1], ISS_PASSWORD );
 672
 673         if( !lpc2900_info->risky )
 674         {
 675                 command_print(CMD_CTX, "Wrong password (use '%s')", ISS_PASSWORD);
 676                 return ERROR_COMMAND_ARGUMENT_INVALID;
 677         }
 678
 679         command_print(CMD_CTX,
 680                   "Potentially dangerous operation allowed in next command!");
 681
 682         return ERROR_OK;
 683 }
 684
 685
 686
 687 /**
 688  * Write customer info from file to the index sector.
 689  */
 690 COMMAND_HANDLER(lpc2900_handle_write_custom_command)
 691 {
 692         if (CMD_ARGC < 2)
 693         {
 694                 return ERROR_COMMAND_SYNTAX_ERROR;
 695         }
 696
 697         struct flash_bank *bank;
 698         int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
 699         if (ERROR_OK != retval)
 700                 return retval;
 701
 702         struct lpc2900_flash_bank *lpc2900_info = bank->driver_priv;
 703
 704         /* Check if command execution is allowed. */
 705         if( !lpc2900_info->risky )
 706         {
 707                 command_print( CMD_CTX, "Command execution not allowed!" );
 708                 return ERROR_COMMAND_ARGUMENT_INVALID;
 709         }
 710         lpc2900_info->risky = 0;
 711
 712         /* Get target, and check if it's halted */
 713         struct target *target = bank->target;
 714         if (target->state != TARGET_HALTED)
 715         {
 716                 LOG_ERROR("Target not halted");
 717                 return ERROR_TARGET_NOT_HALTED;
 718         }
 719
 720         /* The image will always start at offset 0 */
 721         struct image image;
 722         image.base_address_set = 1;
 723         image.base_address = 0;
 724         image.start_address_set = 0;
 725
 726         const char *filename = CMD_ARGV[1];
 727         const char *type = (CMD_ARGC >= 3) ? CMD_ARGV[2] : NULL;
 728         retval = image_open(&image, filename, type);
 729         if (retval != ERROR_OK)
 730         {
 731                 return retval;
 732         }
 733
 734         /* Do a sanity check: The image must be exactly the size of the customer
 735            programmable area. Any other size is rejected. */
 736         if( image.num_sections != 1 )
 737         {
 738                 LOG_ERROR("Only one section allowed in image file.");
 739                 return ERROR_COMMAND_SYNTAX_ERROR;
 740         }
 741         if( (image.sections[0].base_address != 0) ||
 742         (image.sections[0].size != ISS_CUSTOMER_SIZE) )
 743         {
 744                 LOG_ERROR("Incorrect image file size. Expected %d, "
 745                         "got %" PRIu32,
 746                    ISS_CUSTOMER_SIZE, image.sections[0].size);
 747                 return ERROR_COMMAND_SYNTAX_ERROR;
 748         }
 749
 750         /* Well boys, I reckon this is it... */
 751
 752         /* Customer info is split into two blocks in pages 4 and 5. */
 753         uint8_t page[FLASH_PAGE_SIZE];
 754
 755         /* Page 4 */
 756         uint32_t offset = ISS_CUSTOMER_START1 % FLASH_PAGE_SIZE;
 757         memset( page, 0xff, FLASH_PAGE_SIZE );
 758         size_t size_read;
 759         retval = image_read_section( &image, 0, 0,
 760                                      ISS_CUSTOMER_SIZE1, &page[offset], &size_read);
 761         if( retval != ERROR_OK )
 762         {
 763                 LOG_ERROR("couldn't read from file '%s'", filename);
 764                 image_close(&image);
 765                 return retval;
 766         }
 767         if( (retval = lpc2900_write_index_page( bank, 4, &page )) != ERROR_OK )
 768         {
 769                 image_close(&image);
 770                 return retval;
 771         }
 772
 773         /* Page 5 */
 774         offset = ISS_CUSTOMER_START2 % FLASH_PAGE_SIZE;
 775         memset( page, 0xff, FLASH_PAGE_SIZE );
 776         retval = image_read_section( &image, 0, ISS_CUSTOMER_SIZE1,
 777                                      ISS_CUSTOMER_SIZE2, &page[offset], &size_read);
 778         if( retval != ERROR_OK )
 779         {
 780                 LOG_ERROR("couldn't read from file '%s'", filename);
 781                 image_close(&image);
 782                 return retval;
 783         }
 784         if( (retval = lpc2900_write_index_page( bank, 5, &page )) != ERROR_OK )
 785         {
 786                 image_close(&image);
 787                 return retval;
 788         }
 789
 790         image_close(&image);
 791
 792         return ERROR_OK;
 793 }
 794
 795
 796
 797 /**
 798  * Activate 'sector security' for a range of sectors.
 799  */
 800 COMMAND_HANDLER(lpc2900_handle_secure_sector_command)
 801 {
 802         if (CMD_ARGC < 3)
 803         {
 804                 return ERROR_COMMAND_SYNTAX_ERROR;
 805         }
 806
 807         /* Get the bank descriptor */
 808         struct flash_bank *bank;
 809         int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
 810         if (ERROR_OK != retval)
 811                 return retval;
 812
 813         struct lpc2900_flash_bank *lpc2900_info = bank->driver_priv;
 814
 815         /* Check if command execution is allowed. */
 816         if( !lpc2900_info->risky )
 817         {
 818                 command_print( CMD_CTX, "Command execution not allowed! "
 819                 "(use 'password' command first)");
 820                 return ERROR_COMMAND_ARGUMENT_INVALID;
 821         }
 822         lpc2900_info->risky = 0;
 823
 824         /* Read sector range, and do a sanity check. */
 825         int first, last;
 826         COMMAND_PARSE_NUMBER(int, CMD_ARGV[1], first);
 827         COMMAND_PARSE_NUMBER(int, CMD_ARGV[2], last);
 828         if( (first >= bank->num_sectors) ||
 829             (last >= bank->num_sectors) ||
 830             (first > last) )
 831         {
 832                 command_print( CMD_CTX, "Illegal sector range" );
 833                 return ERROR_COMMAND_ARGUMENT_INVALID;
 834         }
 835
 836         uint8_t page[FLASH_PAGE_SIZE];
 837         int sector;
 838
 839         /* Sectors in page 6 */
 840         if( (first <= 4) || (last >= 8) )
 841         {
 842                 memset( &page, 0xff, FLASH_PAGE_SIZE );
 843                 for( sector = first; sector <= last; sector++ )
 844                 {
 845                         if( sector <= 4 )
 846                         {
 847                                 memset( &page[0xB0 + 16*sector], 0, 16 );
 848                         }
 849                         else if( sector >= 8 )
 850                         {
 851                                 memset( &page[0x00 + 16*(sector - 8)], 0, 16 );
 852                         }
 853                 }
 854
 855                 if( (retval = lpc2900_write_index_page( bank, 6, &page )) != ERROR_OK )
 856                 {
 857                         LOG_ERROR("failed to update index sector page 6");
 858                         return retval;
 859                 }
 860         }
 861
 862         /* Sectors in page 7 */
 863         if( (first <= 7) && (last >= 5) )
 864         {
 865                 memset( &page, 0xff, FLASH_PAGE_SIZE );
 866                 for( sector = first; sector <= last; sector++ )
 867                 {
 868                         if( (sector >= 5) && (sector <= 7) )
 869                         {
 870                                 memset( &page[0x00 + 16*(sector - 5)], 0, 16 );
 871                         }
 872                 }
 873
 874                 if( (retval = lpc2900_write_index_page( bank, 7, &page )) != ERROR_OK )
 875                 {
 876                         LOG_ERROR("failed to update index sector page 7");
 877                         return retval;
 878                 }
 879         }
 880
 881         command_print( CMD_CTX,
 882                 "Sectors security will become effective after next power cycle");
 883
 884         /* Update the sector security status */
 885         if ( lpc2900_read_security_status(bank) != ERROR_OK )
 886         {
 887                 LOG_ERROR( "Cannot determine sector security status" );
 888                 return ERROR_FLASH_OPERATION_FAILED;
 889         }
 890
 891         return ERROR_OK;
 892 }
 893
 894
 895
 896 /**
 897  * Activate JTAG protection.
 898  */
 899 COMMAND_HANDLER(lpc2900_handle_secure_jtag_command)
 900 {
 901         if (CMD_ARGC < 1)
 902         {
 903                 return ERROR_COMMAND_SYNTAX_ERROR;
 904         }
 905
 906         /* Get the bank descriptor */
 907         struct flash_bank *bank;
 908         int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
 909         if (ERROR_OK != retval)
 910                 return retval;
 911
 912         struct lpc2900_flash_bank *lpc2900_info = bank->driver_priv;
 913
 914         /* Check if command execution is allowed. */
 915         if( !lpc2900_info->risky )
 916         {
 917                 command_print( CMD_CTX, "Command execution not allowed! "
 918                                         "(use 'password' command first)");
 919                 return ERROR_COMMAND_ARGUMENT_INVALID;
 920         }
 921         lpc2900_info->risky = 0;
 922
 923         /* Prepare page */
 924         uint8_t page[FLASH_PAGE_SIZE];
 925         memset( &page, 0xff, FLASH_PAGE_SIZE );
 926
 927
 928         /* Insert "soft" protection word */
 929         page[0x30 + 15] = 0x7F;
 930         page[0x30 + 11] = 0x7F;
 931         page[0x30 +  7] = 0x7F;
 932         page[0x30 +  3] = 0x7F;
 933
 934         /* Write to page 5 */
 935         if( (retval = lpc2900_write_index_page( bank, 5, &page ))
 936                         != ERROR_OK )
 937         {
 938                 LOG_ERROR("failed to update index sector page 5");
 939                 return retval;
 940         }
 941
 942         LOG_INFO("JTAG security set. Good bye!");
 943
 944         return ERROR_OK;
 945 }
 946
 947
 948
 949 /***********************  Flash interface functions  **************************/
 950
 951 static const struct command_registration lpc2900_exec_command_handlers[] = {
 952         {
 953                 .name = "signature",
 954                 .handler = &lpc2900_handle_signature_command,
 955                 .mode = COMMAND_EXEC,
 956                 .usage = "<bank>",
 957                 .help = "print device signature of flash bank",
 958         },
 959         {
 960                 .name = "read_custom",
 961                 .handler = &lpc2900_handle_read_custom_command,
 962                 .mode = COMMAND_EXEC,
 963                 .usage = "<bank> <filename>",
 964                 .help = "read customer information from index sector to file",
 965         },
 966         {
 967                 .name = "password",
 968                 .handler = &lpc2900_handle_password_command,
 969                 .mode = COMMAND_EXEC,
 970                 .usage = "<bank> <password>",
 971                 .help = "enter password to enable 'dangerous' options",
 972         },
 973         {
 974                 .name = "write_custom",
 975                 .handler = &lpc2900_handle_write_custom_command,
 976                 .mode = COMMAND_EXEC,
 977                 .usage = "<bank> <filename> [<type>]",
 978                 .help = "write customer info from file to index sector",
 979         },
 980         {
 981                 .name = "secure_sector",
 982                 .handler = &lpc2900_handle_secure_sector_command,
 983                 .mode = COMMAND_EXEC,
 984                 .usage = "<bank> <first> <last>",
 985                 .help = "activate sector security for a range of sectors",
 986         },
 987         {
 988                 .name = "secure_jtag",
 989                 .handler = &lpc2900_handle_secure_jtag_command,
 990                 .mode = COMMAND_EXEC,
 991                 .usage = "<bank> <level>",
 992                 .help = "activate JTAG security",
 993         },
 994         COMMAND_REGISTRATION_DONE
 995 };
 996 static const struct command_registration lpc2900_command_handlers[] = {
 997         {
 998                 .name = "lpc2900",
 999                 .mode = COMMAND_ANY,
1000                 .help = "LPC2900 flash command group",
1001                 .chain = lpc2900_exec_command_handlers,
1002         },
1003         COMMAND_REGISTRATION_DONE
1004 };
1005
1006 /// Evaluate flash bank command.
1007 FLASH_BANK_COMMAND_HANDLER(lpc2900_flash_bank_command)
1008 {
1009         struct lpc2900_flash_bank *lpc2900_info;
1010
1011         if (CMD_ARGC < 6)
1012         {
1013                 LOG_WARNING("incomplete flash_bank LPC2900 configuration");
1014                 return ERROR_FLASH_BANK_INVALID;
1015         }
1016
1017         lpc2900_info = malloc(sizeof(struct lpc2900_flash_bank));
1018         bank->driver_priv = lpc2900_info;
1019
1020         /* Get flash clock.
1021          * Reject it if we can't meet the requirements for program time
1022          * (if clock too slow), or for erase time (clock too fast).
1023          */
1024         uint32_t clk_sys_fmc;
1025         COMMAND_PARSE_NUMBER(u32, CMD_ARGV[6], clk_sys_fmc);
1026         lpc2900_info->clk_sys_fmc = clk_sys_fmc * 1000;
1027
1028         uint32_t clock_limit;
1029         /* Check program time limit */
1030         clock_limit = 512000000l / FLASH_PROGRAM_TIME;
1031         if (lpc2900_info->clk_sys_fmc < clock_limit)
1032         {
1033                 LOG_WARNING("flash clock must be at least %" PRIu32 " kHz",
1034                     (clock_limit / 1000));
1035                 return ERROR_FLASH_BANK_INVALID;
1036         }
1037
1038         /* Check erase time limit */
1039         clock_limit = (uint32_t)((32767.0 * 512.0 * 1e6) / FLASH_ERASE_TIME);
1040         if (lpc2900_info->clk_sys_fmc > clock_limit)
1041         {
1042                 LOG_WARNING("flash clock must be a maximum of %" PRIu32" kHz",
1043                     (clock_limit / 1000));
1044                 return ERROR_FLASH_BANK_INVALID;
1045         }
1046
1047         /* Chip ID will be obtained by probing the device later */
1048         lpc2900_info->chipid = 0;
1049
1050         return ERROR_OK;
1051 }
1052
1053
1054 /**
1055  * Erase sector(s).
1056  *
1057  * @param bank Pointer to the flash bank descriptor
1058  * @param first First sector to be erased
1059  * @param last Last sector (including) to be erased
1060  */
1061 static int lpc2900_erase(struct flash_bank *bank, int first, int last)
1062 {
1063         uint32_t status;
1064         int sector;
1065         int last_unsecured_sector;
1066         struct target *target = bank->target;
1067         struct lpc2900_flash_bank *lpc2900_info = bank->driver_priv;
1068
1069
1070         status = lpc2900_is_ready(bank);
1071         if (status != ERROR_OK)
1072         {
1073                 return status;
1074         }
1075
1076         /* Sanity check on sector range */
1077         if ((first < 0) || (last < first) || (last >= bank->num_sectors))
1078         {
1079                 LOG_INFO("Bad sector range");
1080                 return ERROR_FLASH_SECTOR_INVALID;
1081         }
1082
1083         /* Update the info about secured sectors */
1084         lpc2900_read_security_status( bank );
1085
1086         /* The selected sector range might include secured sectors. An attempt
1087          * to erase such a sector will cause the erase to fail also for unsecured
1088          * sectors. It is necessary to determine the last unsecured sector now,
1089          * because we have to treat the last relevant sector in the list in
1090          * a special way.
1091          */
1092         last_unsecured_sector = -1;
1093         for (sector = first; sector <= last; sector++)
1094         {
1095                 if ( !bank->sectors[sector].is_protected )
1096                 {
1097                         last_unsecured_sector = sector;
1098                 }
1099         }
1100
1101         /* Exit now, in case of the rare constellation where all sectors in range
1102          * are secured. This is regarded a success, since erasing/programming of
1103          * secured sectors shall be handled transparently.
1104          */
1105         if ( last_unsecured_sector == -1 )
1106         {
1107                 return ERROR_OK;
1108         }
1109
1110         /* Enable flash block and set the correct CRA clock of 66 kHz */
1111         lpc2900_setup(bank);
1112
1113         /* Clear END_OF_ERASE interrupt status */
1114         target_write_u32(target, INT_CLR_STATUS, INTSRC_END_OF_ERASE);
1115
1116         /* Set the program/erase timer to FLASH_ERASE_TIME */
1117         target_write_u32(target, FPTR,
1118                          FPTR_EN_T | lpc2900_calc_tr( lpc2900_info->clk_sys_fmc,
1119                                                       FLASH_ERASE_TIME ));
1120
1121         /* Sectors are marked for erasure, then erased all together */
1122         for (sector = first; sector <= last_unsecured_sector; sector++)
1123         {
1124                 /* Only mark sectors that aren't secured. Any attempt to erase a group
1125                  * of sectors will fail if any single one of them is secured!
1126                  */
1127                 if ( !bank->sectors[sector].is_protected )
1128                 {
1129                         /* Unprotect the sector */
1130                         target_write_u32(target, bank->sectors[sector].offset, 0);
1131                         target_write_u32(target, FCTR,
1132                                          FCTR_FS_LOADREQ | FCTR_FS_WPB |
1133                                          FCTR_FS_WEB | FCTR_FS_WRE | FCTR_FS_CS);
1134
1135                         /* Mark the sector for erasure. The last sector in the list
1136                            triggers the erasure. */
1137                         target_write_u32(target, bank->sectors[sector].offset, 0);
1138                         if ( sector == last_unsecured_sector )
1139                         {
1140                                 target_write_u32(target, FCTR,
1141                                                  FCTR_FS_PROGREQ | FCTR_FS_WPB | FCTR_FS_CS);
1142                         }
1143                         else
1144                         {
1145                                 target_write_u32(target, FCTR,
1146                                                  FCTR_FS_LOADREQ | FCTR_FS_WPB |
1147                                                  FCTR_FS_WEB | FCTR_FS_CS);
1148                         }
1149                 }
1150         }
1151
1152         /* Wait for the end of the erase operation. If it's not over after two seconds,
1153          * something went dreadfully wrong... :-(
1154          */
1155         if( lpc2900_wait_status(bank, INTSRC_END_OF_ERASE, 2000) != ERROR_OK )
1156         {
1157                 return ERROR_FLASH_OPERATION_FAILED;
1158         }
1159
1160         /* Normal flash operating mode */
1161         target_write_u32(target, FCTR, FCTR_FS_CS | FCTR_FS_WEB);
1162
1163         return ERROR_OK;
1164 }
1165
1166
1167
1168 static int lpc2900_protect(struct flash_bank *bank, int set, int first, int last)
1169 {
1170         /* This command is not supported.
1171      * "Protection" in LPC2900 terms is handled transparently. Sectors will
1172      * automatically be unprotected as needed.
1173      * Instead we use the concept of sector security. A secured sector is shown
1174      * as "protected" in OpenOCD. Sector security is a permanent feature, and
1175      * cannot be disabled once activated.
1176      */
1177
1178         return ERROR_OK;
1179 }
1180
1181
1182 /**
1183  * Write data to flash.
1184  *
1185  * @param bank Pointer to the flash bank descriptor
1186  * @param buffer Buffer with data
1187  * @param offset Start address (relative to bank start)
1188  * @param count Number of bytes to be programmed
1189  */
1190 static int lpc2900_write(struct flash_bank *bank, uint8_t *buffer,
1191                          uint32_t offset, uint32_t count)
1192 {
1193         uint8_t page[FLASH_PAGE_SIZE];
1194         uint32_t status;
1195         uint32_t num_bytes;
1196         struct target *target = bank->target;
1197         struct lpc2900_flash_bank *lpc2900_info = bank->driver_priv;
1198         int sector;
1199         int retval;
1200
1201         static const uint32_t write_target_code[] = {
1202                 /* Set auto latch mode: FCTR=CS|WRE|WEB */
1203                 0xe3a0a007,   /* loop       mov r10, #0x007 */
1204                 0xe583a000,   /*            str r10,[r3,#0] */
1205
1206                 /* Load complete page into latches */
1207                 0xe3a06020,   /*            mov r6,#(512/16) */
1208                 0xe8b00f00,   /* next       ldmia r0!,{r8-r11} */
1209                 0xe8a10f00,   /*            stmia r1!,{r8-r11} */
1210                 0xe2566001,   /*            subs r6,#1 */
1211                 0x1afffffb,   /*            bne next */
1212
1213                 /* Clear END_OF_BURN interrupt status */
1214                 0xe3a0a002,   /*            mov r10,#(1 << 1) */
1215                 0xe583afe8,   /*            str r10,[r3,#0xfe8] */
1216
1217                 /* Set the erase time to FLASH_PROGRAM_TIME */
1218                 0xe5834008,   /*            str r4,[r3,#8] */
1219
1220                 /* Trigger flash write
1221                         FCTR = CS | WRE | WPB | PROGREQ */
1222                 0xe3a0a083,   /*            mov r10,#0x83 */
1223                 0xe38aaa01,   /*            orr r10,#0x1000 */
1224                 0xe583a000,   /*            str r10,[r3,#0] */
1225
1226                 /* Wait for end of burn */
1227                 0xe593afe0,   /* wait       ldr r10,[r3,#0xfe0] */
1228                 0xe21aa002,   /*            ands r10,#(1 << 1) */
1229                 0x0afffffc,   /*            beq wait */
1230
1231                 /* End? */
1232                 0xe2522001,   /*            subs r2,#1 */
1233                 0x1affffed,   /*            bne loop */
1234
1235                 0xeafffffe    /* done       b done */
1236         };
1237
1238
1239         status = lpc2900_is_ready(bank);
1240         if (status != ERROR_OK)
1241         {
1242                 return status;
1243         }
1244
1245         /* Enable flash block and set the correct CRA clock of 66 kHz */
1246         lpc2900_setup(bank);
1247
1248         /* Update the info about secured sectors */
1249         lpc2900_read_security_status( bank );
1250
1251         /* Unprotect all involved sectors */
1252         for (sector = 0; sector < bank->num_sectors; sector++)
1253         {
1254                 /* Start address in or before this sector? */
1255                 /* End address in or behind this sector? */
1256                 if ( ((bank->base + offset) <
1257                           (bank->sectors[sector].offset + bank->sectors[sector].size)) &&
1258                      ((bank->base + (offset + count - 1)) >= bank->sectors[sector].offset) )
1259                 {
1260                         /* This sector is involved and needs to be unprotected.
1261                                 * Don't do it for secured sectors.
1262                                 */
1263                         if ( !bank->sectors[sector].is_protected )
1264                         {
1265                                 target_write_u32(target, bank->sectors[sector].offset, 0);
1266                                 target_write_u32(target, FCTR,
1267                                                  FCTR_FS_LOADREQ | FCTR_FS_WPB |
1268                                                  FCTR_FS_WEB | FCTR_FS_WRE | FCTR_FS_CS);
1269                         }
1270                 }
1271         }
1272
1273         /* Set the program/erase time to FLASH_PROGRAM_TIME */
1274         uint32_t prog_time = FPTR_EN_T | lpc2900_calc_tr( lpc2900_info->clk_sys_fmc,
1275                                                           FLASH_PROGRAM_TIME );
1276
1277         /* If there is a working area of reasonable size, use it to program via
1278            a target algorithm. If not, fall back to host programming. */
1279
1280         /* We need some room for target code. */
1281         uint32_t target_code_size = sizeof(write_target_code);
1282
1283         /* Try working area allocation. Start with a large buffer, and try with
1284            reduced size if that fails. */
1285         struct working_area *warea;
1286         uint32_t buffer_size = lpc2900_info->max_ram_block - 1 * KiB;
1287         while( (retval = target_alloc_working_area(target,
1288                                                    buffer_size + target_code_size,
1289                                                    &warea)) != ERROR_OK )
1290         {
1291                 /* Try a smaller buffer now, and stop if it's too small. */
1292                 buffer_size -= 1 * KiB;
1293                 if (buffer_size < 2 * KiB)
1294                 {
1295                         LOG_INFO( "no (large enough) working area"
1296                                   ", falling back to host mode" );
1297                         warea = NULL;
1298                         break;
1299                 }
1300         };
1301
1302         if( warea )
1303         {
1304                 struct reg_param reg_params[5];
1305                 struct armv4_5_algorithm armv4_5_info;
1306
1307                 /* We can use target mode. Download the algorithm. */
1308                 retval = target_write_buffer( target,
1309                                               (warea->address)+buffer_size,
1310                                               target_code_size,
1311                                               (uint8_t *)write_target_code);
1312                 if (retval != ERROR_OK)
1313                 {
1314                         LOG_ERROR("Unable to write block write code to target");
1315                         target_free_all_working_areas(target);
1316                         return ERROR_FLASH_OPERATION_FAILED;
1317                 }
1318
1319                 init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
1320                 init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
1321                 init_reg_param(&reg_params[2], "r2", 32, PARAM_OUT);
1322                 init_reg_param(&reg_params[3], "r3", 32, PARAM_OUT);
1323                 init_reg_param(&reg_params[4], "r4", 32, PARAM_OUT);
1324
1325                 /* Write to flash in large blocks */
1326                 while ( count != 0 )
1327                 {
1328                         uint32_t this_npages;
1329                         uint8_t *this_buffer;
1330                         int start_sector = lpc2900_address2sector( bank, offset );
1331
1332                         /* First page / last page / rest */
1333                         if( offset % FLASH_PAGE_SIZE )
1334                         {
1335                                 /* Block doesn't start on page boundary.
1336                                    Burn first partial page separately. */
1337                                 memset( &page, 0xff, sizeof(page) );
1338                                 memcpy( &page[offset % FLASH_PAGE_SIZE],
1339                                         buffer,
1340                                         FLASH_PAGE_SIZE - (offset % FLASH_PAGE_SIZE) );
1341                                 this_npages = 1;
1342                                 this_buffer = &page[0];
1343                                 count = count + (offset % FLASH_PAGE_SIZE);
1344                                 offset = offset - (offset % FLASH_PAGE_SIZE);
1345                         }
1346                         else if( count < FLASH_PAGE_SIZE )
1347                         {
1348                                 /* Download last incomplete page separately. */
1349                                 memset( &page, 0xff, sizeof(page) );
1350                                 memcpy( &page, buffer, count );
1351                                 this_npages = 1;
1352                                 this_buffer = &page[0];
1353                                 count = FLASH_PAGE_SIZE;
1354                         }
1355                         else
1356                         {
1357                                 /* Download as many full pages as possible */
1358                                 this_npages = (count < buffer_size) ?
1359                                                count / FLASH_PAGE_SIZE :
1360                                                buffer_size / FLASH_PAGE_SIZE;
1361                                 this_buffer = buffer;
1362
1363                                 /* Make sure we stop at the next secured sector */
1364                                 int sector = start_sector + 1;
1365                                 while( sector < bank->num_sectors )
1366                                 {
1367                                         /* Secured? */
1368                                         if( bank->sectors[sector].is_protected )
1369                                         {
1370                                                 /* Is that next sector within the current block? */
1371                                                 if( (bank->sectors[sector].offset - bank->base) <
1372                                                         (offset + (this_npages * FLASH_PAGE_SIZE)) )
1373                                                 {
1374                                                         /* Yes! Split the block */
1375                                                         this_npages =
1376                                                           (bank->sectors[sector].offset - bank->base - offset)
1377                                                               / FLASH_PAGE_SIZE;
1378                                                         break;
1379                                                 }
1380                                         }
1381
1382                                         sector++;
1383                                 }
1384                         }
1385
1386                         /* Skip the current sector if it is secured */
1387                         if (bank->sectors[start_sector].is_protected)
1388                         {
1389                                 LOG_DEBUG("Skip secured sector %d",
1390                                                 start_sector);
1391
1392                                 /* Stop if this is the last sector */
1393                                 if (start_sector == bank->num_sectors - 1)
1394                                 {
1395                                         break;
1396                                 }
1397
1398                                 /* Skip */
1399                                 uint32_t nskip = bank->sectors[start_sector].size -
1400                                                  (offset % bank->sectors[start_sector].size);
1401                                 offset += nskip;
1402                                 buffer += nskip;
1403                                 count = (count >= nskip) ? (count - nskip) : 0;
1404                                 continue;
1405                         }
1406
1407                         /* Execute buffer download */
1408                         if ((retval = target_write_buffer(target,
1409                                                           warea->address,
1410                                                           this_npages * FLASH_PAGE_SIZE,
1411                                                           this_buffer)) != ERROR_OK)
1412                         {
1413                                 LOG_ERROR("Unable to write data to target");
1414                                 target_free_all_working_areas(target);
1415                                 return ERROR_FLASH_OPERATION_FAILED;
1416                         }
1417
1418                         /* Prepare registers */
1419                         buf_set_u32(reg_params[0].value, 0, 32, warea->address);
1420                         buf_set_u32(reg_params[1].value, 0, 32, offset);
1421                         buf_set_u32(reg_params[2].value, 0, 32, this_npages);
1422                         buf_set_u32(reg_params[3].value, 0, 32, FCTR);
1423                         buf_set_u32(reg_params[4].value, 0, 32, FPTR_EN_T | prog_time);
1424
1425                         /* Execute algorithm, assume breakpoint for last instruction */
1426                         armv4_5_info.common_magic = ARMV4_5_COMMON_MAGIC;
1427                         armv4_5_info.core_mode = ARMV4_5_MODE_SVC;
1428                         armv4_5_info.core_state = ARMV4_5_STATE_ARM;
1429
1430                         retval = target_run_algorithm(target, 0, NULL, 5, reg_params,
1431                                 (warea->address) + buffer_size,
1432                                 (warea->address) + buffer_size + target_code_size - 4,
1433                                 10000, /* 10s should be enough for max. 16 KiB of data */
1434                                 &armv4_5_info);
1435
1436                         if (retval != ERROR_OK)
1437                         {
1438                                 LOG_ERROR("Execution of flash algorithm failed.");
1439                                 target_free_all_working_areas(target);
1440                                 retval = ERROR_FLASH_OPERATION_FAILED;
1441                                 break;
1442                         }
1443
1444                         count -= this_npages * FLASH_PAGE_SIZE;
1445                         buffer += this_npages * FLASH_PAGE_SIZE;
1446                         offset += this_npages * FLASH_PAGE_SIZE;
1447                 }
1448
1449                 /* Free all resources */
1450                 destroy_reg_param(&reg_params[0]);
1451                 destroy_reg_param(&reg_params[1]);
1452                 destroy_reg_param(&reg_params[2]);
1453                 destroy_reg_param(&reg_params[3]);
1454                 destroy_reg_param(&reg_params[4]);
1455                 target_free_all_working_areas(target);
1456         }
1457         else
1458         {
1459                 /* Write to flash memory page-wise */
1460                 while ( count != 0 )
1461                 {
1462                         /* How many bytes do we copy this time? */
1463                         num_bytes = (count >= FLASH_PAGE_SIZE) ?
1464                                     FLASH_PAGE_SIZE - (offset % FLASH_PAGE_SIZE) :
1465                                     count;
1466
1467                         /* Don't do anything with it if the page is in a secured sector. */
1468                         if ( !bank->sectors[lpc2900_address2sector(bank, offset)].is_protected )
1469                         {
1470                                 /* Set latch load mode */
1471                                 target_write_u32(target, FCTR,
1472                                                  FCTR_FS_CS | FCTR_FS_WRE | FCTR_FS_WEB);
1473
1474                                 /* Always clear the buffer (a little overhead, but who cares) */
1475                                 memset(page, 0xFF, FLASH_PAGE_SIZE);
1476
1477                                 /* Copy them to the buffer */
1478                                 memcpy( &page[offset % FLASH_PAGE_SIZE],
1479                                         &buffer[offset % FLASH_PAGE_SIZE],
1480                                         num_bytes );
1481
1482                                 /* Write whole page to flash data latches */
1483                                 if (target_write_memory(
1484                                                  target,
1485                                                  bank->base + (offset - (offset % FLASH_PAGE_SIZE)),
1486                                                  4, FLASH_PAGE_SIZE / 4, page) != ERROR_OK)
1487                                 {
1488                                         LOG_ERROR("Write failed @ 0x%8.8" PRIx32, offset);
1489                                         target_write_u32(target, FCTR, FCTR_FS_CS | FCTR_FS_WEB);
1490
1491                                         return ERROR_FLASH_OPERATION_FAILED;
1492                                 }
1493
1494                                 /* Clear END_OF_BURN interrupt status */
1495                                 target_write_u32(target, INT_CLR_STATUS, INTSRC_END_OF_BURN);
1496
1497                                 /* Set the programming time */
1498                                 target_write_u32(target, FPTR, FPTR_EN_T | prog_time);
1499
1500                                 /* Trigger flash write */
1501                                 target_write_u32(target, FCTR,
1502                                     FCTR_FS_CS | FCTR_FS_WRE | FCTR_FS_WPB | FCTR_FS_PROGREQ);
1503
1504                                 /* Wait for the end of the write operation. If it's not over
1505                                  * after one second, something went dreadfully wrong... :-(
1506                                  */
1507                                 if (lpc2900_wait_status(bank, INTSRC_END_OF_BURN, 1000) != ERROR_OK)
1508                                 {
1509                                         LOG_ERROR("Write failed @ 0x%8.8" PRIx32, offset);
1510                                         target_write_u32(target, FCTR, FCTR_FS_CS | FCTR_FS_WEB);
1511
1512                                         return ERROR_FLASH_OPERATION_FAILED;
1513                                 }
1514                         }
1515
1516                         /* Update pointers and counters */
1517                         offset += num_bytes;
1518                         buffer += num_bytes;
1519                         count -= num_bytes;
1520                 }
1521
1522                 retval = ERROR_OK;
1523         }
1524
1525         /* Normal flash operating mode */
1526         target_write_u32(target, FCTR, FCTR_FS_CS | FCTR_FS_WEB);
1527
1528         return retval;
1529 }
1530
1531
1532 /**
1533  * Try and identify the device.
1534  *
1535  * Determine type number and its memory layout.
1536  *
1537  * @param bank Pointer to the flash bank descriptor
1538  */
1539 static int lpc2900_probe(struct flash_bank *bank)
1540 {
1541         struct lpc2900_flash_bank *lpc2900_info = bank->driver_priv;
1542         struct target *target = bank->target;
1543         int i = 0;
1544         uint32_t offset;
1545
1546
1547         if (target->state != TARGET_HALTED)
1548         {
1549                 LOG_ERROR("Target not halted");
1550                 return ERROR_TARGET_NOT_HALTED;
1551         }
1552
1553         /* We want to do this only once. Check if we already have a valid CHIPID,
1554          * because then we will have already successfully probed the device.
1555          */
1556         if (lpc2900_info->chipid == EXPECTED_CHIPID)
1557         {
1558                 return ERROR_OK;
1559         }
1560
1561         /* Probing starts with reading the CHIPID register. We will continue only
1562          * if this identifies as an LPC2900 device.
1563          */
1564         target_read_u32(target, CHIPID, &lpc2900_info->chipid);
1565
1566         if (lpc2900_info->chipid != EXPECTED_CHIPID)
1567         {
1568                 LOG_WARNING("Device is not an LPC29xx");
1569                 return ERROR_FLASH_OPERATION_FAILED;
1570         }
1571
1572         /* It's an LPC29xx device. Now read the feature register FEAT0...FEAT3. */
1573         uint32_t feat0, feat1, feat2, feat3;
1574         target_read_u32(target, FEAT0, &feat0);
1575         target_read_u32(target, FEAT1, &feat1);
1576         target_read_u32(target, FEAT2, &feat2);
1577         target_read_u32(target, FEAT3, &feat3);
1578
1579         /* Base address */
1580         bank->base = 0x20000000;
1581
1582         /* Determine flash layout from FEAT2 register */
1583         uint32_t num_64k_sectors = (feat2 >> 16) & 0xFF;
1584         uint32_t num_8k_sectors = (feat2 >> 0) & 0xFF;
1585         bank->num_sectors = num_64k_sectors + num_8k_sectors;
1586         bank->size = KiB * (64 * num_64k_sectors + 8 * num_8k_sectors);
1587
1588         /* Determine maximum contiguous RAM block */
1589         lpc2900_info->max_ram_block = 16 * KiB;
1590         if( (feat1 & 0x30) == 0x30 )
1591         {
1592                 lpc2900_info->max_ram_block = 32 * KiB;
1593                 if( (feat1 & 0x0C) == 0x0C )
1594                 {
1595                         lpc2900_info->max_ram_block = 48 * KiB;
1596                 }
1597         }
1598
1599         /* Determine package code and ITCM size */
1600         uint32_t package_code = feat0 & 0x0F;
1601         uint32_t itcm_code = (feat1 >> 16) & 0x1F;
1602
1603         /* Determine the exact type number. */
1604         uint32_t found = 1;
1605         if ( (package_code == 4) && (itcm_code == 5) )
1606         {
1607                 /* Old LPC2917 or LPC2919 (non-/01 devices) */
1608                 lpc2900_info->target_name = (bank->size == 768*KiB) ? "LPC2919" : "LPC2917";
1609         }
1610         else
1611         {
1612                 if ( package_code == 2 )
1613                 {
1614                         /* 100-pin package */
1615                         if ( bank->size == 128*KiB )
1616                         {
1617                                 lpc2900_info->target_name = "LPC2921";
1618                         }
1619                         else if ( bank->size == 256*KiB )
1620                         {
1621                                 lpc2900_info->target_name = "LPC2923";
1622                         }
1623                         else if ( bank->size == 512*KiB )
1624                         {
1625                                 lpc2900_info->target_name = "LPC2925";
1626                         }
1627                         else
1628                         {
1629                                 found = 0;
1630                         }
1631                 }
1632                 else if ( package_code == 4 )
1633                 {
1634                         /* 144-pin package */
1635                         if ( (bank->size == 512*KiB) && (feat3 == 0xFFFFFCF0) )
1636                         {
1637                                 lpc2900_info->target_name = "LPC2917/01";
1638                         }
1639                         else if ( (bank->size == 512*KiB) && (feat3 == 0xFFFFFFF1) )
1640                         {
1641                                 lpc2900_info->target_name = "LPC2927";
1642                         }
1643                         else if ( (bank->size == 768*KiB) && (feat3 == 0xFFFFFCF8) )
1644                         {
1645                                 lpc2900_info->target_name = "LPC2919/01";
1646                         }
1647                         else if ( (bank->size == 768*KiB) && (feat3 == 0xFFFFFFF9) )
1648                         {
1649                                 lpc2900_info->target_name = "LPC2929";
1650                         }
1651                         else
1652                         {
1653                                 found = 0;
1654                         }
1655                 }
1656                 else if ( package_code == 5 )
1657                 {
1658                         /* 208-pin package */
1659                         lpc2900_info->target_name = (bank->size == 0) ? "LPC2930" : "LPC2939";
1660                 }
1661                 else
1662                 {
1663                         found = 0;
1664                 }
1665         }
1666
1667         if ( !found )
1668         {
1669                 LOG_WARNING("Unknown LPC29xx derivative");
1670                 return ERROR_FLASH_OPERATION_FAILED;
1671         }
1672
1673         /* Show detected device */
1674         LOG_INFO("Flash bank %d"
1675                  ": Device %s, %" PRIu32
1676                  " KiB in %d sectors",
1677                  bank->bank_number,
1678                  lpc2900_info->target_name, bank->size / KiB,
1679                  bank->num_sectors);
1680
1681         /* Flashless devices cannot be handled */
1682         if ( bank->num_sectors == 0 )
1683         {
1684                 LOG_WARNING("Flashless device cannot be handled");
1685                 return ERROR_FLASH_OPERATION_FAILED;
1686         }
1687
1688         /* Sector layout.
1689          * These are logical sector numbers. When doing real flash operations,
1690          * the logical flash number are translated into the physical flash numbers
1691          * of the device.
1692          */
1693         bank->sectors = malloc(sizeof(struct flash_sector) * bank->num_sectors);
1694
1695         offset = 0;
1696         for (i = 0; i < bank->num_sectors; i++)
1697         {
1698                 bank->sectors[i].offset = offset;
1699                 bank->sectors[i].is_erased = -1;
1700                 bank->sectors[i].is_protected = -1;
1701
1702                 if ( i <= 7 )
1703                 {
1704                         bank->sectors[i].size = 8 * KiB;
1705                 }
1706                 else if ( i <= 18 )
1707                 {
1708                         bank->sectors[i].size = 64 * KiB;
1709                 }
1710                 else
1711                 {
1712                         /* We shouldn't come here. But there might be a new part out there
1713                          * that has more than 19 sectors. Politely ask for a fix then.
1714                          */
1715                         bank->sectors[i].size = 0;
1716                         LOG_ERROR("Never heard about sector %d", i);
1717                 }
1718
1719                 offset += bank->sectors[i].size;
1720         }
1721
1722         /* Read sector security status */
1723         if ( lpc2900_read_security_status(bank) != ERROR_OK )
1724         {
1725                 LOG_ERROR("Cannot determine sector security status");
1726                 return ERROR_FLASH_OPERATION_FAILED;
1727         }
1728
1729         return ERROR_OK;
1730 }
1731
1732
1733 /**
1734  * Run a blank check for each sector.
1735  *
1736  * For speed reasons, the device isn't read word by word.
1737  * A hash value is calculated by the hardware ("BIST") for each sector.
1738  * This value is then compared against the known hash of an empty sector.
1739  *
1740  * @param bank Pointer to the flash bank descriptor
1741  */
1742 static int lpc2900_erase_check(struct flash_bank *bank)
1743 {
1744         uint32_t status = lpc2900_is_ready(bank);
1745         if (status != ERROR_OK)
1746         {
1747                 LOG_INFO("Processor not halted/not probed");
1748                 return status;
1749         }
1750
1751         /* Use the BIST (Built-In Selft Test) to generate a signature of each flash
1752          * sector. Compare against the expected signature of an empty sector.
1753          */
1754         int sector;
1755         for ( sector = 0; sector < bank->num_sectors; sector++ )
1756         {
1757                 uint32_t signature[4];
1758                 if ( (status = lpc2900_run_bist128( bank,
1759                                                     bank->sectors[sector].offset,
1760                                                     bank->sectors[sector].offset +
1761                                                        (bank->sectors[sector].size - 1),
1762                                                     &signature)) != ERROR_OK )
1763                 {
1764                         return status;
1765                 }
1766
1767                 /* The expected signatures for an empty sector are different
1768                  * for 8 KiB and 64 KiB sectors.
1769                  */
1770                 if ( bank->sectors[sector].size == 8*KiB )
1771                 {
1772                         bank->sectors[sector].is_erased =
1773                             (signature[3] == 0x01ABAAAA) &&
1774                             (signature[2] == 0xAAAAAAAA) &&
1775                             (signature[1] == 0xAAAAAAAA) &&
1776                             (signature[0] == 0xAAA00AAA);
1777                 }
1778                 if ( bank->sectors[sector].size == 64*KiB )
1779                 {
1780                         bank->sectors[sector].is_erased =
1781                             (signature[3] == 0x11801222) &&
1782                             (signature[2] == 0xB88844FF) &&
1783                             (signature[1] == 0x11A22008) &&
1784                             (signature[0] == 0x2B1BFE44);
1785                 }
1786         }
1787
1788         return ERROR_OK;
1789 }
1790
1791
1792 /**
1793  * Get protection (sector security) status.
1794  *
1795  * Determine the status of "sector security" for each sector.
1796  * A secured sector is one that can never be erased/programmed again.
1797  *
1798  * @param bank Pointer to the flash bank descriptor
1799  */
1800 static int lpc2900_protect_check(struct flash_bank *bank)
1801 {
1802         return lpc2900_read_security_status(bank);
1803 }
1804
1805
1806 /**
1807  * Print info about the driver (not the device).
1808  *
1809  * @param bank Pointer to the flash bank descriptor
1810  * @param buf Buffer to take the string
1811  * @param buf_size Maximum number of characters that the buffer can take
1812  */
1813 static int lpc2900_info(struct flash_bank *bank, char *buf, int buf_size)
1814 {
1815         snprintf(buf, buf_size, "lpc2900 flash driver");
1816
1817         return ERROR_OK;
1818 }
1819
1820
1821 struct flash_driver lpc2900_flash =
1822 {
1823         .name               = "lpc2900",
1824         .commands           = lpc2900_command_handlers,
1825         .flash_bank_command = lpc2900_flash_bank_command,
1826         .erase              = lpc2900_erase,
1827         .protect            = lpc2900_protect,
1828         .write              = lpc2900_write,
1829         .probe              = lpc2900_probe,
1830         .auto_probe         = lpc2900_probe,
1831         .erase_check        = lpc2900_erase_check,
1832         .protect_check      = lpc2900_protect_check,
1833         .info               = lpc2900_info
1834 };