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   1 /***************************************************************************
   2  *   Copyright (C) 2009 by Duane Ellis                                     *
   3  *   openocd@duaneellis.com                                                *
   4  *                                                                         *
   5  *   Copyright (C) 2010 by Olaf Lüke (at91sam3s* support)                  *
   6  *   olaf@uni-paderborn.de                                                 *
   7  *                                                                         *
   8  *   Copyright (C) 2011 by Olivier Schonken, Jim Norris                    *
   9  *   (at91sam3x* & at91sam4 support)*                                      *
  10  *                                                                         *
  11  *   Copyright (C) 2015 Morgan Quigley                                     *
  12  *   (atsamv, atsams, and atsame support)                                  *
  13  *                                                                         *
  14  *   This program is free software; you can redistribute it and/or modify  *
  15  *   it under the terms of the GNU General Public License as published by  *
  16  *   the Free Software Foundation; either version 2 of the License, or     *
  17  *   (at your option) any later version.                                   *
  18  *                                                                         *
  19  *   This program is distributed in the hope that it will be useful,       *
  20  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  21  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  22  *   GNU General Public License for more details.                          *
  23  *                                                                         *
  24  *   You should have received a copy of the GNU General Public License     *
  25  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  26  ***************************************************************************/
  27
  28 /* Some of the the lower level code was based on code supplied by
  29  * ATMEL under this copyright. */
  30
  31 /* BEGIN ATMEL COPYRIGHT */
  32 /* ----------------------------------------------------------------------------
  33  *         ATMEL Microcontroller Software Support
  34  * ----------------------------------------------------------------------------
  35  * Copyright (c) 2009, Atmel Corporation
  36  *
  37  * All rights reserved.
  38  *
  39  * Redistribution and use in source and binary forms, with or without
  40  * modification, are permitted provided that the following conditions are met:
  41  *
  42  * - Redistributions of source code must retain the above copyright notice,
  43  * this list of conditions and the disclaimer below.
  44  *
  45  * Atmel's name may not be used to endorse or promote products derived from
  46  * this software without specific prior written permission.
  47  *
  48  * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
  49  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  50  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
  51  * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
  52  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  53  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
  54  * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  55  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  56  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  57  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  58  * ----------------------------------------------------------------------------
  59  */
  60 /* END ATMEL COPYRIGHT */
  61
  62 #ifdef HAVE_CONFIG_H
  63 #include "config.h"
  64 #endif
  65
  66 #include "imp.h"
  67 #include <helper/time_support.h>
  68
  69 #define REG_NAME_WIDTH  (12)
  70
  71 #define SAMV_EFC_FCMD_GETD   (0x0)      /* (EFC) Get Flash Descriptor */
  72 #define SAMV_EFC_FCMD_WP     (0x1)      /* (EFC) Write Page */
  73 #define SAMV_EFC_FCMD_WPL    (0x2)      /* (EFC) Write Page and Lock */
  74 #define SAMV_EFC_FCMD_EWP    (0x3)      /* (EFC) Erase Page and Write Page */
  75 #define SAMV_EFC_FCMD_EWPL   (0x4)      /* (EFC) Erase Page, Write Page then Lock*/
  76 #define SAMV_EFC_FCMD_EA     (0x5)      /* (EFC) Erase All */
  77 #define SAMV_EFC_FCMD_EPA    (0x7)      /* (EFC) Erase pages */
  78 #define SAMV_EFC_FCMD_SLB    (0x8)      /* (EFC) Set Lock Bit */
  79 #define SAMV_EFC_FCMD_CLB    (0x9)      /* (EFC) Clear Lock Bit */
  80 #define SAMV_EFC_FCMD_GLB    (0xA)      /* (EFC) Get Lock Bit */
  81 #define SAMV_EFC_FCMD_SFB    (0xB)      /* (EFC) Set Fuse Bit */
  82 #define SAMV_EFC_FCMD_CFB    (0xC)      /* (EFC) Clear Fuse Bit */
  83 #define SAMV_EFC_FCMD_GFB    (0xD)      /* (EFC) Get Fuse Bit */
  84
  85 #define OFFSET_EFC_FMR    0
  86 #define OFFSET_EFC_FCR    4
  87 #define OFFSET_EFC_FSR    8
  88 #define OFFSET_EFC_FRR   12
  89
  90 #define SAMV_CHIPID_CIDR       (0x400E0940)
  91 #define SAMV_NUM_GPNVM_BITS              9
  92 #define SAMV_CONTROLLER_ADDR   (0x400e0c00)
  93 #define SAMV_SECTOR_SIZE             16384
  94 #define SAMV_PAGE_SIZE                 512
  95 #define SAMV_FLASH_BASE         0x00400000
  96
  97 extern struct flash_driver atsamv_flash;
  98
  99 struct samv_flash_bank {
 100         int      probed;
 101         unsigned size_bytes;
 102         unsigned gpnvm[SAMV_NUM_GPNVM_BITS];
 103 };
 104
 105 /* The actual sector size of the SAMV7 flash memory is 128K bytes.
 106  * 16 sectors for a 2048KB device. The lock regions are 16KB per lock
 107  * region, with a 2048KB device having 128 lock regions.
 108  * For the best results, num_sectors is thus set to the number of lock
 109  * regions, and the sector_size set to the lock region size. Page
 110  * erases are used to erase 16KB sections when programming */
 111
 112 static int samv_efc_get_status(struct target *target, uint32_t *v)
 113 {
 114         int r = target_read_u32(target, SAMV_CONTROLLER_ADDR + OFFSET_EFC_FSR, v);
 115         return r;
 116 }
 117
 118 static int samv_efc_get_result(struct target *target, uint32_t *v)
 119 {
 120         uint32_t rv;
 121         int r = target_read_u32(target, SAMV_CONTROLLER_ADDR + OFFSET_EFC_FRR, &rv);
 122         if (v)
 123                 *v = rv;
 124         return r;
 125 }
 126
 127 static int samv_efc_start_command(struct target *target,
 128                 unsigned command, unsigned argument)
 129 {
 130         uint32_t v;
 131         samv_efc_get_status(target, &v);
 132         if (!(v & 1)) {
 133                 LOG_ERROR("flash controller is not ready");
 134                 return ERROR_FAIL;
 135         }
 136
 137         v = (0x5A << 24) | (argument << 8) | command;
 138         LOG_DEBUG("starting flash command: 0x%08x", (unsigned int)(v));
 139         int r = target_write_u32(target, SAMV_CONTROLLER_ADDR + OFFSET_EFC_FCR, v);
 140         if (r != ERROR_OK)
 141                 LOG_DEBUG("write failed");
 142         return r;
 143 }
 144
 145 static int samv_efc_perform_command(struct target *target,
 146                 unsigned command, unsigned argument, uint32_t *status)
 147 {
 148         int r;
 149         uint32_t v;
 150         long long ms_now, ms_end;
 151
 152         if (status)
 153                 *status = 0;
 154
 155         r = samv_efc_start_command(target, command, argument);
 156         if (r != ERROR_OK)
 157                 return r;
 158
 159         ms_end = 10000 + timeval_ms();
 160
 161         do {
 162                 r = samv_efc_get_status(target, &v);
 163                 if (r != ERROR_OK)
 164                         return r;
 165                 ms_now = timeval_ms();
 166                 if (ms_now > ms_end) {
 167                         /* error */
 168                         LOG_ERROR("Command timeout");
 169                         return ERROR_FAIL;
 170                 }
 171         } while ((v & 1) == 0);
 172
 173         /* if requested, copy the flash controller error bits back to the caller */
 174         if (status)
 175                 *status = (v & 0x6);
 176         return ERROR_OK;
 177 }
 178
 179 static int samv_erase_pages(struct target *target,
 180                 int first_page, int num_pages, uint32_t *status)
 181 {
 182         uint8_t erase_pages;
 183         switch (num_pages) {
 184                 case 4:
 185                         erase_pages = 0x00;
 186                         break;
 187                 case 8:
 188                         erase_pages = 0x01;
 189                         break;
 190                 case 16:
 191                         erase_pages = 0x02;
 192                         break;
 193                 case 32:
 194                         erase_pages = 0x03;
 195                         break;
 196                 default:
 197                         erase_pages = 0x00;
 198                         break;
 199         }
 200
 201         /* SAMV_EFC_FCMD_EPA
 202          * According to the datasheet FARG[15:2] defines the page from which
 203          * the erase will start.This page must be modulo 4, 8, 16 or 32
 204          * according to the number of pages to erase. FARG[1:0] defines the
 205          * number of pages to be erased. Previously (firstpage << 2) was used
 206          * to conform to this, seems it should not be shifted...
 207          */
 208         return samv_efc_perform_command(target, SAMV_EFC_FCMD_EPA,
 209                         first_page | erase_pages, status);
 210 }
 211
 212 static int samv_get_gpnvm(struct target *target, unsigned gpnvm, unsigned *out)
 213 {
 214         uint32_t v;
 215         int r;
 216
 217         if (gpnvm >= SAMV_NUM_GPNVM_BITS) {
 218                 LOG_ERROR("invalid gpnvm %d, max: %d", gpnvm, SAMV_NUM_GPNVM_BITS);
 219                 return ERROR_FAIL;
 220         }
 221
 222         r = samv_efc_perform_command(target, SAMV_EFC_FCMD_GFB, 0, NULL);
 223         if (r != ERROR_OK) {
 224                 LOG_ERROR("samv_get_gpnvm failed");
 225                 return r;
 226         }
 227
 228         r = samv_efc_get_result(target, &v);
 229
 230         if (out)
 231                 *out = (v >> gpnvm) & 1;
 232
 233         return r;
 234 }
 235
 236 static int samv_clear_gpnvm(struct target *target, unsigned gpnvm)
 237 {
 238         int r;
 239         unsigned v;
 240
 241         if (gpnvm >= SAMV_NUM_GPNVM_BITS) {
 242                 LOG_ERROR("invalid gpnvm %d, max: %d", gpnvm, SAMV_NUM_GPNVM_BITS);
 243                 return ERROR_FAIL;
 244         }
 245         r = samv_get_gpnvm(target, gpnvm, &v);
 246         if (r != ERROR_OK) {
 247                 LOG_DEBUG("get gpnvm failed: %d", r);
 248                 return r;
 249         }
 250         r = samv_efc_perform_command(target, SAMV_EFC_FCMD_CFB, gpnvm, NULL);
 251         LOG_DEBUG("clear gpnvm result: %d", r);
 252         return r;
 253 }
 254
 255 static int samv_set_gpnvm(struct target *target, unsigned gpnvm)
 256 {
 257         int r;
 258         unsigned v;
 259         if (gpnvm >= SAMV_NUM_GPNVM_BITS) {
 260                 LOG_ERROR("invalid gpnvm %d, max: %d", gpnvm, SAMV_NUM_GPNVM_BITS);
 261                 return ERROR_FAIL;
 262         }
 263
 264         r = samv_get_gpnvm(target, gpnvm, &v);
 265         if (r != ERROR_OK)
 266                 return r;
 267         if (v) {
 268                 r = ERROR_OK; /* the gpnvm bit is already set */
 269         } else {
 270                 /* we need to set it */
 271                 r = samv_efc_perform_command(target, SAMV_EFC_FCMD_SFB, gpnvm, NULL);
 272         }
 273         return r;
 274 }
 275
 276 static int samv_flash_unlock(struct target *target,
 277                 unsigned start_sector, unsigned end_sector)
 278 {
 279         int r;
 280         uint32_t status;
 281         uint32_t pg;
 282         uint32_t pages_per_sector;
 283
 284         /* todo: look into this... i think this should be done on lock regions */
 285         pages_per_sector = SAMV_SECTOR_SIZE / SAMV_PAGE_SIZE;
 286         while (start_sector <= end_sector) {
 287                 pg = start_sector * pages_per_sector;
 288                 r = samv_efc_perform_command(target, SAMV_EFC_FCMD_CLB, pg, &status);
 289                 if (r != ERROR_OK)
 290                         return r;
 291                 start_sector++;
 292         }
 293         return ERROR_OK;
 294 }
 295
 296 static int samv_flash_lock(struct target *target,
 297                 unsigned start_sector, unsigned end_sector)
 298 {
 299         uint32_t status;
 300         uint32_t pg;
 301         uint32_t pages_per_sector;
 302         int r;
 303
 304         /* todo: look into this... i think this should be done on lock regions */
 305         pages_per_sector = SAMV_SECTOR_SIZE / SAMV_PAGE_SIZE;
 306         while (start_sector <= end_sector) {
 307                 pg = start_sector * pages_per_sector;
 308                 r = samv_efc_perform_command(target, SAMV_EFC_FCMD_SLB, pg, &status);
 309                 if (r != ERROR_OK)
 310                         return r;
 311                 start_sector++;
 312         }
 313         return ERROR_OK;
 314 }
 315
 316 static int samv_protect_check(struct flash_bank *bank)
 317 {
 318         int r;
 319         uint32_t v[4] = {0};
 320
 321         r = samv_efc_perform_command(bank->target, SAMV_EFC_FCMD_GLB, 0, NULL);
 322         if (r == ERROR_OK)      {
 323                 samv_efc_get_result(bank->target, &v[0]);
 324                 samv_efc_get_result(bank->target, &v[1]);
 325                 samv_efc_get_result(bank->target, &v[2]);
 326                 r = samv_efc_get_result(bank->target, &v[3]);
 327         }
 328         if (r != ERROR_OK)
 329                 return r;
 330
 331         for (int x = 0; x < bank->num_sectors; x++)
 332                 bank->sectors[x].is_protected = (!!(v[x >> 5] & (1 << (x % 32))));
 333         return ERROR_OK;
 334 }
 335
 336 FLASH_BANK_COMMAND_HANDLER(samv_flash_bank_command)
 337 {
 338         LOG_INFO("flash bank command");
 339         struct samv_flash_bank *samv_info;
 340         samv_info = calloc(1, sizeof(struct samv_flash_bank));
 341         bank->driver_priv = samv_info;
 342         return ERROR_OK;
 343 }
 344
 345 static int samv_get_device_id(struct flash_bank *bank, uint32_t *device_id)
 346 {
 347         return target_read_u32(bank->target, SAMV_CHIPID_CIDR, device_id);
 348 }
 349
 350 static int samv_probe(struct flash_bank *bank)
 351 {
 352         uint32_t device_id;
 353         int r = samv_get_device_id(bank, &device_id);
 354         if (r != ERROR_OK)
 355                 return r;
 356         LOG_INFO("device id = 0x%08" PRIx32 "", device_id);
 357
 358         uint8_t eproc = (device_id >> 5) & 0x7;
 359         if (eproc != 0) {
 360                 LOG_ERROR("unexpected eproc code: %d was expecting 0 (Cortex-M7)", eproc);
 361                 return ERROR_FAIL;
 362         }
 363
 364         uint8_t nvm_size_code = (device_id >> 8) & 0xf;
 365         switch (nvm_size_code) {
 366                 case 12:
 367                         bank->size = 1024 * 1024;
 368                         break;
 369                 case 14:
 370                         bank->size = 2048 * 1024;
 371                         break;
 372                 default:
 373                         LOG_ERROR("unrecognized flash size code: %d", nvm_size_code);
 374                         return ERROR_FAIL;
 375                         break;
 376         }
 377
 378         struct samv_flash_bank *samv_info = bank->driver_priv;
 379         samv_info->size_bytes = bank->size;
 380         samv_info->probed = 1;
 381
 382         bank->base = SAMV_FLASH_BASE;
 383         bank->num_sectors = bank->size / SAMV_SECTOR_SIZE;
 384         bank->sectors = calloc(bank->num_sectors, sizeof(struct flash_sector));
 385         for (int s = 0; s < (int)bank->num_sectors; s++) {
 386                 bank->sectors[s].size = SAMV_SECTOR_SIZE;
 387                 bank->sectors[s].offset = s * SAMV_SECTOR_SIZE;
 388                 bank->sectors[s].is_erased = -1;
 389                 bank->sectors[s].is_protected = -1;
 390         }
 391
 392         r = samv_protect_check(bank);
 393         if (r != ERROR_OK)
 394                 return r;
 395
 396         return ERROR_OK;
 397 }
 398
 399 static int samv_auto_probe(struct flash_bank *bank)
 400 {
 401         struct samv_flash_bank *samv_info = bank->driver_priv;
 402         if (samv_info->probed)
 403                 return ERROR_OK;
 404         return samv_probe(bank);
 405 }
 406
 407 static int samv_erase(struct flash_bank *bank, int first, int last)
 408 {
 409         const int page_count = 32; /* 32 pages equals 16 KB lock region */
 410
 411         if (bank->target->state != TARGET_HALTED) {
 412                 LOG_ERROR("Target not halted");
 413                 return ERROR_TARGET_NOT_HALTED;
 414         }
 415
 416         int r = samv_auto_probe(bank);
 417         if (r != ERROR_OK)
 418                 return r;
 419
 420         /* easy case: we've been requested to erase the entire flash */
 421         if ((first == 0) && ((last + 1) == (int)(bank->num_sectors)))
 422                 return samv_efc_perform_command(bank->target, SAMV_EFC_FCMD_EA, 0, NULL);
 423
 424         LOG_INFO("erasing lock regions %d-%d...", first, last);
 425
 426         for (int i = first; i <= last; i++) {
 427                 uint32_t status;
 428                 r = samv_erase_pages(bank->target, (i * page_count), page_count, &status);
 429                 LOG_INFO("erasing lock region %d", i);
 430                 if (r != ERROR_OK)
 431                         LOG_ERROR("error performing erase page @ lock region number %d",
 432                                         (unsigned int)(i));
 433                 if (status & (1 << 2)) {
 434                         LOG_ERROR("lock region %d is locked", (unsigned int)(i));
 435                         return ERROR_FAIL;
 436                 }
 437                 if (status & (1 << 1)) {
 438                         LOG_ERROR("flash command error @lock region %d", (unsigned int)(i));
 439                         return ERROR_FAIL;
 440                 }
 441         }
 442         return ERROR_OK;
 443 }
 444
 445 static int samv_protect(struct flash_bank *bank, int set, int first, int last)
 446 {
 447         if (bank->target->state != TARGET_HALTED) {
 448                 LOG_ERROR("Target not halted");
 449                 return ERROR_TARGET_NOT_HALTED;
 450         }
 451
 452         int r;
 453         if (set)
 454                 r = samv_flash_lock(bank->target, (unsigned)(first), (unsigned)(last));
 455         else
 456                 r = samv_flash_unlock(bank->target, (unsigned)(first), (unsigned)(last));
 457
 458         return r;
 459 }
 460
 461 static int samv_page_read(struct target *target,
 462                 unsigned page_num, uint8_t *buf)
 463 {
 464         uint32_t addr = SAMV_FLASH_BASE + page_num * SAMV_PAGE_SIZE;
 465         int r = target_read_memory(target, addr, 4, SAMV_PAGE_SIZE / 4, buf);
 466         if (r != ERROR_OK)
 467                 LOG_ERROR("flash program failed to read page @ 0x%08x",
 468                                 (unsigned int)(addr));
 469         return r;
 470 }
 471
 472 static int samv_page_write(struct target *target,
 473                 unsigned pagenum, const uint8_t *buf)
 474 {
 475         uint32_t status;
 476         const uint32_t addr = SAMV_FLASH_BASE + pagenum * SAMV_PAGE_SIZE;
 477         int r;
 478
 479         LOG_DEBUG("write page %u at address 0x%08x", pagenum, (unsigned int)addr);
 480         r = target_write_memory(target, addr, 4, SAMV_PAGE_SIZE / 4, buf);
 481         if (r != ERROR_OK) {
 482                 LOG_ERROR("failed to buffer page at 0x%08x", (unsigned int)addr);
 483                 return r;
 484         }
 485
 486         r = samv_efc_perform_command(target, SAMV_EFC_FCMD_WP, pagenum, &status);
 487         if (r != ERROR_OK)
 488                 LOG_ERROR("error performing write page at 0x%08x", (unsigned int)addr);
 489         if (status & (1 << 2)) {
 490                 LOG_ERROR("page at 0x%08x is locked", (unsigned int)addr);
 491                 return ERROR_FAIL;
 492         }
 493         if (status & (1 << 1)) {
 494                 LOG_ERROR("flash command error at 0x%08x", (unsigned int)addr);
 495                 return ERROR_FAIL;
 496         }
 497         return ERROR_OK;
 498 }
 499
 500 static int samv_write(struct flash_bank *bank, const uint8_t *buffer,
 501                 uint32_t offset, uint32_t count)
 502 {
 503         if (bank->target->state != TARGET_HALTED) {
 504                 LOG_ERROR("target not halted");
 505                 return ERROR_TARGET_NOT_HALTED;
 506         }
 507
 508         if (count == 0)
 509                 return ERROR_OK;
 510
 511         if ((offset + count) > bank->size) {
 512                 LOG_ERROR("flash write error - past end of bank");
 513                 LOG_ERROR(" offset: 0x%08x, count 0x%08x, bank end: 0x%08x",
 514                                 (unsigned int)(offset),
 515                                 (unsigned int)(count),
 516                                 (unsigned int)(bank->size));
 517                 return ERROR_FAIL;
 518         }
 519
 520         uint8_t pagebuffer[SAMV_PAGE_SIZE] = {0};
 521         uint32_t page_cur = offset / SAMV_PAGE_SIZE;
 522         uint32_t page_end = (offset + count - 1) / SAMV_PAGE_SIZE;
 523
 524         LOG_DEBUG("offset: 0x%08x, count: 0x%08x",
 525                         (unsigned int)(offset), (unsigned int)(count));
 526         LOG_DEBUG("page start: %d, page end: %d", (int)(page_cur), (int)(page_end));
 527
 528         /* Special case: all one page */
 529         /* Otherwise:                 */
 530         /*    (1) non-aligned start   */
 531         /*    (2) body pages          */
 532         /*    (3) non-aligned end.    */
 533
 534         int r;
 535         uint32_t page_offset;
 536
 537         /* handle special case - all one page. */
 538         if (page_cur == page_end) {
 539                 LOG_DEBUG("special case, all in one page");
 540                 r = samv_page_read(bank->target, page_cur, pagebuffer);
 541                 if (r != ERROR_OK)
 542                         return r;
 543
 544                 page_offset = offset & (SAMV_PAGE_SIZE-1);
 545                 memcpy(pagebuffer + page_offset, buffer, count);
 546
 547                 r = samv_page_write(bank->target, page_cur, pagebuffer);
 548                 if (r != ERROR_OK)
 549                         return r;
 550                 return ERROR_OK;
 551         }
 552
 553         /* step 1) handle the non-aligned starting address */
 554         page_offset = offset & (SAMV_PAGE_SIZE - 1);
 555         if (page_offset) {
 556                 LOG_DEBUG("non-aligned start");
 557                 /* read the partial page */
 558                 r = samv_page_read(bank->target, page_cur, pagebuffer);
 559                 if (r != ERROR_OK)
 560                         return r;
 561
 562                 /* over-write with new data */
 563                 uint32_t n = SAMV_PAGE_SIZE - page_offset;
 564                 memcpy(pagebuffer + page_offset, buffer, n);
 565
 566                 r = samv_page_write(bank->target, page_cur, pagebuffer);
 567                 if (r != ERROR_OK)
 568                         return r;
 569
 570                 count  -= n;
 571                 offset += n;
 572                 buffer += n;
 573                 page_cur++;
 574         }
 575
 576         /* By checking that offset is correct here, we also fix a clang warning */
 577         assert(offset % SAMV_PAGE_SIZE == 0);
 578
 579         /* step 2) handle the full pages */
 580         LOG_DEBUG("full page loop: cur=%d, end=%d, count = 0x%08x",
 581                         (int)page_cur, (int)page_end, (unsigned int)(count));
 582
 583         while ((page_cur < page_end) && (count >= SAMV_PAGE_SIZE)) {
 584                 r = samv_page_write(bank->target, page_cur, buffer);
 585                 if (r != ERROR_OK)
 586                         return r;
 587                 count -= SAMV_PAGE_SIZE;
 588                 buffer += SAMV_PAGE_SIZE;
 589                 page_cur += 1;
 590         }
 591
 592         /* step 3) write final page, if it's partial (otherwise it's already done) */
 593         if (count) {
 594                 LOG_DEBUG("final partial page, count = 0x%08x", (unsigned int)(count));
 595                 /* we have a partial page */
 596                 r = samv_page_read(bank->target, page_cur, pagebuffer);
 597                 if (r != ERROR_OK)
 598                         return r;
 599                 memcpy(pagebuffer, buffer, count); /* data goes at start of page */
 600                 r = samv_page_write(bank->target, page_cur, pagebuffer);
 601                 if (r != ERROR_OK)
 602                         return r;
 603         }
 604         return ERROR_OK;
 605 }
 606
 607 static int samv_get_info(struct flash_bank *bank, char *buf, int buf_size)
 608 {
 609         struct samv_flash_bank *samv_info = bank->driver_priv;
 610         if (!samv_info->probed) {
 611                 int r = samv_probe(bank);
 612                 if (ERROR_OK != r)
 613                         return r;
 614         }
 615         snprintf(buf, buf_size, "Cortex-M7 detected with %d kB flash",
 616                         bank->size / 1024);
 617         return ERROR_OK;
 618 }
 619
 620 COMMAND_HANDLER(samv_handle_gpnvm_command)
 621 {
 622         struct flash_bank *bank = get_flash_bank_by_num_noprobe(0);
 623         if (!bank)
 624                 return ERROR_FAIL;
 625         struct samv_flash_bank *samv_info = bank->driver_priv;
 626         struct target *target = bank->target;
 627
 628         if (target->state != TARGET_HALTED) {
 629                 LOG_ERROR("target not halted");
 630                 return ERROR_TARGET_NOT_HALTED;
 631         }
 632
 633         int r;
 634         if (!samv_info->probed) {
 635                 r = samv_auto_probe(bank);
 636                 if (r != ERROR_OK)
 637                         return r;
 638         }
 639
 640         int who = 0;
 641
 642         switch (CMD_ARGC) {
 643                 case 0:
 644                         goto showall;
 645                         break;
 646                 case 1:
 647                         who = -1;
 648                         break;
 649                 case 2:
 650                         if (!strcmp(CMD_ARGV[0], "show") && !strcmp(CMD_ARGV[1], "all"))
 651                                 who = -1;
 652                         else {
 653                                 uint32_t v32;
 654                                 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], v32);
 655                                 who = v32;
 656                         }
 657                         break;
 658                 default:
 659                         return ERROR_COMMAND_SYNTAX_ERROR;
 660                         break;
 661         }
 662
 663         uint32_t v;
 664         if (!strcmp("show", CMD_ARGV[0])) {
 665                 if (who == -1) {
 666 showall:
 667                         r = ERROR_OK;
 668                         for (int x = 0; x < SAMV_NUM_GPNVM_BITS; x++) {
 669                                 r = samv_get_gpnvm(target, x, &v);
 670                                 if (r != ERROR_OK)
 671                                         break;
 672                                 command_print(CMD_CTX, "samv-gpnvm%u: %u", x, v);
 673                         }
 674                         return r;
 675                 }
 676                 if ((who >= 0) && (((unsigned)who) < SAMV_NUM_GPNVM_BITS)) {
 677                         r = samv_get_gpnvm(target, who, &v);
 678                         command_print(CMD_CTX, "samv-gpnvm%u: %u", who, v);
 679                         return r;
 680                 } else {
 681                         command_print(CMD_CTX, "invalid gpnvm: %u", who);
 682                         return ERROR_COMMAND_SYNTAX_ERROR;
 683                 }
 684         }
 685
 686         if (who == -1) {
 687                 command_print(CMD_CTX, "missing gpnvm number");
 688                 return ERROR_COMMAND_SYNTAX_ERROR;
 689         }
 690
 691         if (!strcmp("set", CMD_ARGV[0]))
 692                 r = samv_set_gpnvm(target, who);
 693         else if (!strcmp("clr", CMD_ARGV[0]) || !strcmp("clear", CMD_ARGV[0]))
 694                 r = samv_clear_gpnvm(target, who);
 695         else {
 696                 command_print(CMD_CTX, "unknown command: %s", CMD_ARGV[0]);
 697                 r = ERROR_COMMAND_SYNTAX_ERROR;
 698         }
 699         return r;
 700 }
 701
 702 static const struct command_registration atsamv_exec_command_handlers[] = {
 703         {
 704                 .name = "gpnvm",
 705                 .handler = samv_handle_gpnvm_command,
 706                 .mode = COMMAND_EXEC,
 707                 .usage = "[('clr'|'set'|'show') bitnum]",
 708                 .help = "Without arguments, shows all bits in the gpnvm "
 709                         "register.  Otherwise, clears, sets, or shows one "
 710                         "General Purpose Non-Volatile Memory (gpnvm) bit.",
 711         },
 712         COMMAND_REGISTRATION_DONE
 713 };
 714
 715 static const struct command_registration atsamv_command_handlers[] = {
 716         {
 717                 .name = "atsamv",
 718                 .mode = COMMAND_ANY,
 719                 .help = "atsamv flash command group",
 720                 .usage = "",
 721                 .chain = atsamv_exec_command_handlers,
 722         },
 723         COMMAND_REGISTRATION_DONE
 724 };
 725
 726 struct flash_driver atsamv_flash = {
 727         .name = "atsamv",
 728         .commands = atsamv_command_handlers,
 729         .flash_bank_command = samv_flash_bank_command,
 730         .erase = samv_erase,
 731         .protect = samv_protect,
 732         .write = samv_write,
 733         .read = default_flash_read,
 734         .probe = samv_probe,
 735         .auto_probe = samv_auto_probe,
 736         .erase_check = default_flash_blank_check,
 737         .protect_check = samv_protect_check,
 738         .info = samv_get_info,
 739 };