drivers/dfu/dfu.c

   1 /*
   2  * dfu.c -- DFU back-end routines
   3  *
   4  * Copyright (C) 2012 Samsung Electronics
   5  * author: Lukasz Majewski <l.majewski@samsung.com>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <errno.h>
  12 #include <malloc.h>
  13 #include <mmc.h>
  14 #include <fat.h>
  15 #include <dfu.h>
  16 #include <hash.h>
  17 #include <linux/list.h>
  18 #include <linux/compiler.h>
  19
  20 static LIST_HEAD(dfu_list);
  21 static int dfu_alt_num;
  22 static int alt_num_cnt;
  23 static struct hash_algo *dfu_hash_algo;
  24
  25 /*
  26  * The purpose of the dfu_usb_get_reset() function is to
  27  * provide information if after USB_DETACH request
  28  * being sent the dfu-util performed reset of USB
  29  * bus.
  30  *
  31  * Described behaviour is the only way to distinct if
  32  * user has typed -e (detach) or -R (reset) when invoking
  33  * dfu-util command.
  34  *
  35  */
  36 __weak bool dfu_usb_get_reset(void)
  37 {
  38 #ifdef CONFIG_SPL_DFU_NO_RESET
  39         return false;
  40 #else
  41         return true;
  42 #endif
  43 }
  44
  45 static int dfu_find_alt_num(const char *s)
  46 {
  47         int i = 0;
  48
  49         for (; *s; s++)
  50                 if (*s == ';')
  51                         i++;
  52
  53         return ++i;
  54 }
  55
  56 int dfu_init_env_entities(char *interface, char *devstr)
  57 {
  58         const char *str_env;
  59         char *env_bkp;
  60         int ret;
  61
  62 #ifdef CONFIG_SET_DFU_ALT_INFO
  63         set_dfu_alt_info(interface, devstr);
  64 #endif
  65         str_env = getenv("dfu_alt_info");
  66         if (!str_env) {
  67                 error("\"dfu_alt_info\" env variable not defined!\n");
  68                 return -EINVAL;
  69         }
  70
  71         env_bkp = strdup(str_env);
  72         ret = dfu_config_entities(env_bkp, interface, devstr);
  73         if (ret) {
  74                 error("DFU entities configuration failed!\n");
  75                 return ret;
  76         }
  77
  78         free(env_bkp);
  79         return 0;
  80 }
  81
  82 static unsigned char *dfu_buf;
  83 static unsigned long dfu_buf_size;
  84
  85 unsigned char *dfu_free_buf(void)
  86 {
  87         free(dfu_buf);
  88         dfu_buf = NULL;
  89         return dfu_buf;
  90 }
  91
  92 unsigned long dfu_get_buf_size(void)
  93 {
  94         return dfu_buf_size;
  95 }
  96
  97 unsigned char *dfu_get_buf(struct dfu_entity *dfu)
  98 {
  99         char *s;
 100
 101         if (dfu_buf != NULL)
 102                 return dfu_buf;
 103
 104         s = getenv("dfu_bufsiz");
 105         if (s)
 106                 dfu_buf_size = (unsigned long)simple_strtol(s, NULL, 0);
 107
 108         if (!s || !dfu_buf_size)
 109                 dfu_buf_size = CONFIG_SYS_DFU_DATA_BUF_SIZE;
 110
 111         if (dfu->max_buf_size && dfu_buf_size > dfu->max_buf_size)
 112                 dfu_buf_size = dfu->max_buf_size;
 113
 114         dfu_buf = memalign(CONFIG_SYS_CACHELINE_SIZE, dfu_buf_size);
 115         if (dfu_buf == NULL)
 116                 printf("%s: Could not memalign 0x%lx bytes\n",
 117                        __func__, dfu_buf_size);
 118
 119         return dfu_buf;
 120 }
 121
 122 static char *dfu_get_hash_algo(void)
 123 {
 124         char *s;
 125
 126         s = getenv("dfu_hash_algo");
 127         if (!s)
 128                 return NULL;
 129
 130         if (!strcmp(s, "crc32")) {
 131                 debug("%s: DFU hash method: %s\n", __func__, s);
 132                 return s;
 133         }
 134
 135         error("DFU hash method: %s not supported!\n", s);
 136         return NULL;
 137 }
 138
 139 static int dfu_write_buffer_drain(struct dfu_entity *dfu)
 140 {
 141         long w_size;
 142         int ret;
 143
 144         /* flush size? */
 145         w_size = dfu->i_buf - dfu->i_buf_start;
 146         if (w_size == 0)
 147                 return 0;
 148
 149         if (dfu_hash_algo)
 150                 dfu_hash_algo->hash_update(dfu_hash_algo, &dfu->crc,
 151                                            dfu->i_buf_start, w_size, 0);
 152
 153         ret = dfu->write_medium(dfu, dfu->offset, dfu->i_buf_start, &w_size);
 154         if (ret)
 155                 debug("%s: Write error!\n", __func__);
 156
 157         /* point back */
 158         dfu->i_buf = dfu->i_buf_start;
 159
 160         /* update offset */
 161         dfu->offset += w_size;
 162
 163         puts("#");
 164
 165         return ret;
 166 }
 167
 168 void dfu_transaction_cleanup(struct dfu_entity *dfu)
 169 {
 170         /* clear everything */
 171         dfu->crc = 0;
 172         dfu->offset = 0;
 173         dfu->i_blk_seq_num = 0;
 174         dfu->i_buf_start = dfu_buf;
 175         dfu->i_buf_end = dfu_buf;
 176         dfu->i_buf = dfu->i_buf_start;
 177         dfu->r_left = 0;
 178         dfu->b_left = 0;
 179         dfu->bad_skip = 0;
 180
 181         dfu->inited = 0;
 182 }
 183
 184 int dfu_flush(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 185 {
 186         int ret = 0;
 187
 188         ret = dfu_write_buffer_drain(dfu);
 189         if (ret)
 190                 return ret;
 191
 192         if (dfu->flush_medium)
 193                 ret = dfu->flush_medium(dfu);
 194
 195         if (dfu_hash_algo)
 196                 printf("\nDFU complete %s: 0x%08x\n", dfu_hash_algo->name,
 197                        dfu->crc);
 198
 199         dfu_transaction_cleanup(dfu);
 200
 201         return ret;
 202 }
 203
 204 int dfu_write(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 205 {
 206         int ret;
 207
 208         debug("%s: name: %s buf: 0x%p size: 0x%x p_num: 0x%x offset: 0x%llx bufoffset: 0x%lx\n",
 209               __func__, dfu->name, buf, size, blk_seq_num, dfu->offset,
 210               (unsigned long)(dfu->i_buf - dfu->i_buf_start));
 211
 212         if (!dfu->inited) {
 213                 /* initial state */
 214                 dfu->crc = 0;
 215                 dfu->offset = 0;
 216                 dfu->bad_skip = 0;
 217                 dfu->i_blk_seq_num = 0;
 218                 dfu->i_buf_start = dfu_get_buf(dfu);
 219                 if (dfu->i_buf_start == NULL)
 220                         return -ENOMEM;
 221                 dfu->i_buf_end = dfu_get_buf(dfu) + dfu_buf_size;
 222                 dfu->i_buf = dfu->i_buf_start;
 223
 224                 dfu->inited = 1;
 225         }
 226
 227         if (dfu->i_blk_seq_num != blk_seq_num) {
 228                 printf("%s: Wrong sequence number! [%d] [%d]\n",
 229                        __func__, dfu->i_blk_seq_num, blk_seq_num);
 230                 dfu_transaction_cleanup(dfu);
 231                 return -1;
 232         }
 233
 234         /* DFU 1.1 standard says:
 235          * The wBlockNum field is a block sequence number. It increments each
 236          * time a block is transferred, wrapping to zero from 65,535. It is used
 237          * to provide useful context to the DFU loader in the device."
 238          *
 239          * This means that it's a 16 bit counter that roll-overs at
 240          * 0xffff -> 0x0000. By having a typical 4K transfer block
 241          * we roll-over at exactly 256MB. Not very fun to debug.
 242          *
 243          * Handling rollover, and having an inited variable,
 244          * makes things work.
 245          */
 246
 247         /* handle rollover */
 248         dfu->i_blk_seq_num = (dfu->i_blk_seq_num + 1) & 0xffff;
 249
 250         /* flush buffer if overflow */
 251         if ((dfu->i_buf + size) > dfu->i_buf_end) {
 252                 ret = dfu_write_buffer_drain(dfu);
 253                 if (ret) {
 254                         dfu_transaction_cleanup(dfu);
 255                         return ret;
 256                 }
 257         }
 258
 259         /* we should be in buffer now (if not then size too large) */
 260         if ((dfu->i_buf + size) > dfu->i_buf_end) {
 261                 error("Buffer overflow! (0x%p + 0x%x > 0x%p)\n", dfu->i_buf,
 262                       size, dfu->i_buf_end);
 263                 dfu_transaction_cleanup(dfu);
 264                 return -1;
 265         }
 266
 267         memcpy(dfu->i_buf, buf, size);
 268         dfu->i_buf += size;
 269
 270         /* if end or if buffer full flush */
 271         if (size == 0 || (dfu->i_buf + size) > dfu->i_buf_end) {
 272                 ret = dfu_write_buffer_drain(dfu);
 273                 if (ret) {
 274                         dfu_transaction_cleanup(dfu);
 275                         return ret;
 276                 }
 277         }
 278
 279         return 0;
 280 }
 281
 282 static int dfu_read_buffer_fill(struct dfu_entity *dfu, void *buf, int size)
 283 {
 284         long chunk;
 285         int ret, readn;
 286
 287         readn = 0;
 288         while (size > 0) {
 289                 /* get chunk that can be read */
 290                 chunk = min((long)size, dfu->b_left);
 291                 /* consume */
 292                 if (chunk > 0) {
 293                         memcpy(buf, dfu->i_buf, chunk);
 294                         if (dfu_hash_algo)
 295                                 dfu_hash_algo->hash_update(dfu_hash_algo,
 296                                                            &dfu->crc, buf,
 297                                                            chunk, 0);
 298
 299                         dfu->i_buf += chunk;
 300                         dfu->b_left -= chunk;
 301                         size -= chunk;
 302                         buf += chunk;
 303                         readn += chunk;
 304                 }
 305
 306                 /* all done */
 307                 if (size > 0) {
 308                         /* no more to read */
 309                         if (dfu->r_left == 0)
 310                                 break;
 311
 312                         dfu->i_buf = dfu->i_buf_start;
 313                         dfu->b_left = dfu->i_buf_end - dfu->i_buf_start;
 314
 315                         /* got to read, but buffer is empty */
 316                         if (dfu->b_left > dfu->r_left)
 317                                 dfu->b_left = dfu->r_left;
 318                         ret = dfu->read_medium(dfu, dfu->offset, dfu->i_buf,
 319                                         &dfu->b_left);
 320                         if (ret != 0) {
 321                                 debug("%s: Read error!\n", __func__);
 322                                 return ret;
 323                         }
 324                         dfu->offset += dfu->b_left;
 325                         dfu->r_left -= dfu->b_left;
 326
 327                         puts("#");
 328                 }
 329         }
 330
 331         return readn;
 332 }
 333
 334 int dfu_read(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 335 {
 336         int ret = 0;
 337
 338         debug("%s: name: %s buf: 0x%p size: 0x%x p_num: 0x%x i_buf: 0x%p\n",
 339                __func__, dfu->name, buf, size, blk_seq_num, dfu->i_buf);
 340
 341         if (!dfu->inited) {
 342                 dfu->i_buf_start = dfu_get_buf(dfu);
 343                 if (dfu->i_buf_start == NULL)
 344                         return -ENOMEM;
 345
 346                 ret = dfu->get_medium_size(dfu, &dfu->r_left);
 347                 if (ret < 0)
 348                         return ret;
 349
 350                 debug("%s: %s %lld [B]\n", __func__, dfu->name, dfu->r_left);
 351
 352                 dfu->i_blk_seq_num = 0;
 353                 dfu->crc = 0;
 354                 dfu->offset = 0;
 355                 dfu->i_buf_end = dfu_get_buf(dfu) + dfu_buf_size;
 356                 dfu->i_buf = dfu->i_buf_start;
 357                 dfu->b_left = 0;
 358
 359                 dfu->bad_skip = 0;
 360
 361                 dfu->inited = 1;
 362         }
 363
 364         if (dfu->i_blk_seq_num != blk_seq_num) {
 365                 printf("%s: Wrong sequence number! [%d] [%d]\n",
 366                        __func__, dfu->i_blk_seq_num, blk_seq_num);
 367                 return -1;
 368         }
 369         /* handle rollover */
 370         dfu->i_blk_seq_num = (dfu->i_blk_seq_num + 1) & 0xffff;
 371
 372         ret = dfu_read_buffer_fill(dfu, buf, size);
 373         if (ret < 0) {
 374                 printf("%s: Failed to fill buffer\n", __func__);
 375                 return -1;
 376         }
 377
 378         if (ret < size) {
 379                 if (dfu_hash_algo)
 380                         debug("%s: %s %s: 0x%x\n", __func__, dfu->name,
 381                               dfu_hash_algo->name, dfu->crc);
 382                 puts("\nUPLOAD ... done\nCtrl+C to exit ...\n");
 383
 384                 dfu_transaction_cleanup(dfu);
 385         }
 386
 387         return ret;
 388 }
 389
 390 static int dfu_fill_entity(struct dfu_entity *dfu, char *s, int alt,
 391                            char *interface, char *devstr)
 392 {
 393         char *st;
 394
 395         debug("%s: %s interface: %s dev: %s\n", __func__, s, interface, devstr);
 396         st = strsep(&s, " ");
 397         strcpy(dfu->name, st);
 398
 399         dfu->alt = alt;
 400         dfu->max_buf_size = 0;
 401         dfu->free_entity = NULL;
 402
 403         /* Specific for mmc device */
 404         if (strcmp(interface, "mmc") == 0) {
 405                 if (dfu_fill_entity_mmc(dfu, devstr, s))
 406                         return -1;
 407         } else if (strcmp(interface, "nand") == 0) {
 408                 if (dfu_fill_entity_nand(dfu, devstr, s))
 409                         return -1;
 410         } else if (strcmp(interface, "ram") == 0) {
 411                 if (dfu_fill_entity_ram(dfu, devstr, s))
 412                         return -1;
 413         } else if (strcmp(interface, "sf") == 0) {
 414                 if (dfu_fill_entity_sf(dfu, devstr, s))
 415                         return -1;
 416         } else {
 417                 printf("%s: Device %s not (yet) supported!\n",
 418                        __func__,  interface);
 419                 return -1;
 420         }
 421         dfu_get_buf(dfu);
 422
 423         return 0;
 424 }
 425
 426 void dfu_free_entities(void)
 427 {
 428         struct dfu_entity *dfu, *p, *t = NULL;
 429
 430         dfu_free_buf();
 431         list_for_each_entry_safe_reverse(dfu, p, &dfu_list, list) {
 432                 list_del(&dfu->list);
 433                 if (dfu->free_entity)
 434                         dfu->free_entity(dfu);
 435                 t = dfu;
 436         }
 437         if (t)
 438                 free(t);
 439         INIT_LIST_HEAD(&dfu_list);
 440
 441         alt_num_cnt = 0;
 442 }
 443
 444 int dfu_config_entities(char *env, char *interface, char *devstr)
 445 {
 446         struct dfu_entity *dfu;
 447         int i, ret;
 448         char *s;
 449
 450         dfu_alt_num = dfu_find_alt_num(env);
 451         debug("%s: dfu_alt_num=%d\n", __func__, dfu_alt_num);
 452
 453         dfu_hash_algo = NULL;
 454         s = dfu_get_hash_algo();
 455         if (s) {
 456                 ret = hash_lookup_algo(s, &dfu_hash_algo);
 457                 if (ret)
 458                         error("Hash algorithm %s not supported\n", s);
 459         }
 460
 461         dfu = calloc(sizeof(*dfu), dfu_alt_num);
 462         if (!dfu)
 463                 return -1;
 464         for (i = 0; i < dfu_alt_num; i++) {
 465
 466                 s = strsep(&env, ";");
 467                 ret = dfu_fill_entity(&dfu[i], s, alt_num_cnt, interface,
 468                                       devstr);
 469                 if (ret) {
 470                         free(dfu);
 471                         return -1;
 472                 }
 473
 474                 list_add_tail(&dfu[i].list, &dfu_list);
 475                 alt_num_cnt++;
 476         }
 477
 478         return 0;
 479 }
 480
 481 const char *dfu_get_dev_type(enum dfu_device_type t)
 482 {
 483         const char *dev_t[] = {NULL, "eMMC", "OneNAND", "NAND", "RAM", "SF" };
 484         return dev_t[t];
 485 }
 486
 487 const char *dfu_get_layout(enum dfu_layout l)
 488 {
 489         const char *dfu_layout[] = {NULL, "RAW_ADDR", "FAT", "EXT2",
 490                                            "EXT3", "EXT4", "RAM_ADDR" };
 491         return dfu_layout[l];
 492 }
 493
 494 void dfu_show_entities(void)
 495 {
 496         struct dfu_entity *dfu;
 497
 498         puts("DFU alt settings list:\n");
 499
 500         list_for_each_entry(dfu, &dfu_list, list) {
 501                 printf("dev: %s alt: %d name: %s layout: %s\n",
 502                        dfu_get_dev_type(dfu->dev_type), dfu->alt,
 503                        dfu->name, dfu_get_layout(dfu->layout));
 504         }
 505 }
 506
 507 int dfu_get_alt_number(void)
 508 {
 509         return dfu_alt_num;
 510 }
 511
 512 struct dfu_entity *dfu_get_entity(int alt)
 513 {
 514         struct dfu_entity *dfu;
 515
 516         list_for_each_entry(dfu, &dfu_list, list) {
 517                 if (dfu->alt == alt)
 518                         return dfu;
 519         }
 520
 521         return NULL;
 522 }
 523
 524 int dfu_get_alt(char *name)
 525 {
 526         struct dfu_entity *dfu;
 527         char *str;
 528
 529         list_for_each_entry(dfu, &dfu_list, list) {
 530                 if (dfu->name[0] != '/') {
 531                         if (!strncmp(dfu->name, name, strlen(dfu->name)))
 532                                 return dfu->alt;
 533                 } else {
 534                         /*
 535                          * One must also consider absolute path
 536                          * (/boot/bin/uImage) available at dfu->name when
 537                          * compared "plain" file name (uImage)
 538                          *
 539                          * It is the case for e.g. thor gadget where lthor SW
 540                          * sends only the file name, so only the very last part
 541                          * of path must be checked for equality
 542                          */
 543
 544                         str = strstr(dfu->name, name);
 545                         if (!str)
 546                                 continue;
 547
 548                         /*
 549                          * Check if matching substring is the last element of
 550                          * dfu->name (uImage)
 551                          */
 552                         if (strlen(dfu->name) ==
 553                             ((str - dfu->name) + strlen(name)))
 554                                 return dfu->alt;
 555                 }
 556         }
 557
 558         return -ENODEV;
 559 }
 560
 561 int dfu_write_from_mem_addr(struct dfu_entity *dfu, void *buf, int size)
 562 {
 563         unsigned long dfu_buf_size, write, left = size;
 564         int i, ret = 0;
 565         void *dp = buf;
 566
 567         /*
 568          * Here we must call dfu_get_buf(dfu) first to be sure that dfu_buf_size
 569          * has been properly initialized - e.g. if "dfu_bufsiz" has been taken
 570          * into account.
 571          */
 572         dfu_get_buf(dfu);
 573         dfu_buf_size = dfu_get_buf_size();
 574         debug("%s: dfu buf size: %lu\n", __func__, dfu_buf_size);
 575
 576         for (i = 0; left > 0; i++) {
 577                 write = min(dfu_buf_size, left);
 578
 579                 debug("%s: dp: 0x%p left: %lu write: %lu\n", __func__,
 580                       dp, left, write);
 581                 ret = dfu_write(dfu, dp, write, i);
 582                 if (ret) {
 583                         error("DFU write failed\n");
 584                         return ret;
 585                 }
 586
 587                 dp += write;
 588                 left -= write;
 589         }
 590
 591         ret = dfu_flush(dfu, NULL, 0, i);
 592         if (ret)
 593                 error("DFU flush failed!");
 594
 595         return ret;
 596 }