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         return true;
  39 }
  40
  41 static int dfu_find_alt_num(const char *s)
  42 {
  43         int i = 0;
  44
  45         for (; *s; s++)
  46                 if (*s == ';')
  47                         i++;
  48
  49         return ++i;
  50 }
  51
  52 int dfu_init_env_entities(char *interface, char *devstr)
  53 {
  54         const char *str_env;
  55         char *env_bkp;
  56         int ret;
  57
  58 #ifdef CONFIG_SET_DFU_ALT_INFO
  59         set_dfu_alt_info(interface, devstr);
  60 #endif
  61         str_env = getenv("dfu_alt_info");
  62         if (!str_env) {
  63                 error("\"dfu_alt_info\" env variable not defined!\n");
  64                 return -EINVAL;
  65         }
  66
  67         env_bkp = strdup(str_env);
  68         ret = dfu_config_entities(env_bkp, interface, devstr);
  69         if (ret) {
  70                 error("DFU entities configuration failed!\n");
  71                 return ret;
  72         }
  73
  74         free(env_bkp);
  75         return 0;
  76 }
  77
  78 static unsigned char *dfu_buf;
  79 static unsigned long dfu_buf_size;
  80
  81 unsigned char *dfu_free_buf(void)
  82 {
  83         free(dfu_buf);
  84         dfu_buf = NULL;
  85         return dfu_buf;
  86 }
  87
  88 unsigned long dfu_get_buf_size(void)
  89 {
  90         return dfu_buf_size;
  91 }
  92
  93 unsigned char *dfu_get_buf(struct dfu_entity *dfu)
  94 {
  95         char *s;
  96
  97         if (dfu_buf != NULL)
  98                 return dfu_buf;
  99
 100         s = getenv("dfu_bufsiz");
 101         if (s)
 102                 dfu_buf_size = (unsigned long)simple_strtol(s, NULL, 0);
 103
 104         if (!s || !dfu_buf_size)
 105                 dfu_buf_size = CONFIG_SYS_DFU_DATA_BUF_SIZE;
 106
 107         if (dfu->max_buf_size && dfu_buf_size > dfu->max_buf_size)
 108                 dfu_buf_size = dfu->max_buf_size;
 109
 110         dfu_buf = memalign(CONFIG_SYS_CACHELINE_SIZE, dfu_buf_size);
 111         if (dfu_buf == NULL)
 112                 printf("%s: Could not memalign 0x%lx bytes\n",
 113                        __func__, dfu_buf_size);
 114
 115         return dfu_buf;
 116 }
 117
 118 static char *dfu_get_hash_algo(void)
 119 {
 120         char *s;
 121
 122         s = getenv("dfu_hash_algo");
 123         if (!s)
 124                 return NULL;
 125
 126         if (!strcmp(s, "crc32")) {
 127                 debug("%s: DFU hash method: %s\n", __func__, s);
 128                 return s;
 129         }
 130
 131         error("DFU hash method: %s not supported!\n", s);
 132         return NULL;
 133 }
 134
 135 static int dfu_write_buffer_drain(struct dfu_entity *dfu)
 136 {
 137         long w_size;
 138         int ret;
 139
 140         /* flush size? */
 141         w_size = dfu->i_buf - dfu->i_buf_start;
 142         if (w_size == 0)
 143                 return 0;
 144
 145         if (dfu_hash_algo)
 146                 dfu_hash_algo->hash_update(dfu_hash_algo, &dfu->crc,
 147                                            dfu->i_buf_start, w_size, 0);
 148
 149         ret = dfu->write_medium(dfu, dfu->offset, dfu->i_buf_start, &w_size);
 150         if (ret)
 151                 debug("%s: Write error!\n", __func__);
 152
 153         /* point back */
 154         dfu->i_buf = dfu->i_buf_start;
 155
 156         /* update offset */
 157         dfu->offset += w_size;
 158
 159         puts("#");
 160
 161         return ret;
 162 }
 163
 164 void dfu_write_transaction_cleanup(struct dfu_entity *dfu)
 165 {
 166         /* clear everything */
 167         dfu->crc = 0;
 168         dfu->offset = 0;
 169         dfu->i_blk_seq_num = 0;
 170         dfu->i_buf_start = dfu_buf;
 171         dfu->i_buf_end = dfu_buf;
 172         dfu->i_buf = dfu->i_buf_start;
 173         dfu->inited = 0;
 174 }
 175
 176 int dfu_flush(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 177 {
 178         int ret = 0;
 179
 180         ret = dfu_write_buffer_drain(dfu);
 181         if (ret)
 182                 return ret;
 183
 184         if (dfu->flush_medium)
 185                 ret = dfu->flush_medium(dfu);
 186
 187         if (dfu_hash_algo)
 188                 printf("\nDFU complete %s: 0x%08x\n", dfu_hash_algo->name,
 189                        dfu->crc);
 190
 191         dfu_write_transaction_cleanup(dfu);
 192
 193         return ret;
 194 }
 195
 196 int dfu_write(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 197 {
 198         int ret;
 199
 200         debug("%s: name: %s buf: 0x%p size: 0x%x p_num: 0x%x offset: 0x%llx bufoffset: 0x%lx\n",
 201               __func__, dfu->name, buf, size, blk_seq_num, dfu->offset,
 202               (unsigned long)(dfu->i_buf - dfu->i_buf_start));
 203
 204         if (!dfu->inited) {
 205                 /* initial state */
 206                 dfu->crc = 0;
 207                 dfu->offset = 0;
 208                 dfu->bad_skip = 0;
 209                 dfu->i_blk_seq_num = 0;
 210                 dfu->i_buf_start = dfu_get_buf(dfu);
 211                 if (dfu->i_buf_start == NULL)
 212                         return -ENOMEM;
 213                 dfu->i_buf_end = dfu_get_buf(dfu) + dfu_buf_size;
 214                 dfu->i_buf = dfu->i_buf_start;
 215
 216                 dfu->inited = 1;
 217         }
 218
 219         if (dfu->i_blk_seq_num != blk_seq_num) {
 220                 printf("%s: Wrong sequence number! [%d] [%d]\n",
 221                        __func__, dfu->i_blk_seq_num, blk_seq_num);
 222                 dfu_write_transaction_cleanup(dfu);
 223                 return -1;
 224         }
 225
 226         /* DFU 1.1 standard says:
 227          * The wBlockNum field is a block sequence number. It increments each
 228          * time a block is transferred, wrapping to zero from 65,535. It is used
 229          * to provide useful context to the DFU loader in the device."
 230          *
 231          * This means that it's a 16 bit counter that roll-overs at
 232          * 0xffff -> 0x0000. By having a typical 4K transfer block
 233          * we roll-over at exactly 256MB. Not very fun to debug.
 234          *
 235          * Handling rollover, and having an inited variable,
 236          * makes things work.
 237          */
 238
 239         /* handle rollover */
 240         dfu->i_blk_seq_num = (dfu->i_blk_seq_num + 1) & 0xffff;
 241
 242         /* flush buffer if overflow */
 243         if ((dfu->i_buf + size) > dfu->i_buf_end) {
 244                 ret = dfu_write_buffer_drain(dfu);
 245                 if (ret) {
 246                         dfu_write_transaction_cleanup(dfu);
 247                         return ret;
 248                 }
 249         }
 250
 251         /* we should be in buffer now (if not then size too large) */
 252         if ((dfu->i_buf + size) > dfu->i_buf_end) {
 253                 error("Buffer overflow! (0x%p + 0x%x > 0x%p)\n", dfu->i_buf,
 254                       size, dfu->i_buf_end);
 255                 dfu_write_transaction_cleanup(dfu);
 256                 return -1;
 257         }
 258
 259         memcpy(dfu->i_buf, buf, size);
 260         dfu->i_buf += size;
 261
 262         /* if end or if buffer full flush */
 263         if (size == 0 || (dfu->i_buf + size) > dfu->i_buf_end) {
 264                 ret = dfu_write_buffer_drain(dfu);
 265                 if (ret) {
 266                         dfu_write_transaction_cleanup(dfu);
 267                         return ret;
 268                 }
 269         }
 270
 271         return 0;
 272 }
 273
 274 static int dfu_read_buffer_fill(struct dfu_entity *dfu, void *buf, int size)
 275 {
 276         long chunk;
 277         int ret, readn;
 278
 279         readn = 0;
 280         while (size > 0) {
 281                 /* get chunk that can be read */
 282                 chunk = min((long)size, dfu->b_left);
 283                 /* consume */
 284                 if (chunk > 0) {
 285                         memcpy(buf, dfu->i_buf, chunk);
 286                         if (dfu_hash_algo)
 287                                 dfu_hash_algo->hash_update(dfu_hash_algo,
 288                                                            &dfu->crc, buf,
 289                                                            chunk, 0);
 290
 291                         dfu->i_buf += chunk;
 292                         dfu->b_left -= chunk;
 293                         size -= chunk;
 294                         buf += chunk;
 295                         readn += chunk;
 296                 }
 297
 298                 /* all done */
 299                 if (size > 0) {
 300                         /* no more to read */
 301                         if (dfu->r_left == 0)
 302                                 break;
 303
 304                         dfu->i_buf = dfu->i_buf_start;
 305                         dfu->b_left = dfu->i_buf_end - dfu->i_buf_start;
 306
 307                         /* got to read, but buffer is empty */
 308                         if (dfu->b_left > dfu->r_left)
 309                                 dfu->b_left = dfu->r_left;
 310                         ret = dfu->read_medium(dfu, dfu->offset, dfu->i_buf,
 311                                         &dfu->b_left);
 312                         if (ret != 0) {
 313                                 debug("%s: Read error!\n", __func__);
 314                                 return ret;
 315                         }
 316                         dfu->offset += dfu->b_left;
 317                         dfu->r_left -= dfu->b_left;
 318
 319                         puts("#");
 320                 }
 321         }
 322
 323         return readn;
 324 }
 325
 326 int dfu_read(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 327 {
 328         int ret = 0;
 329
 330         debug("%s: name: %s buf: 0x%p size: 0x%x p_num: 0x%x i_buf: 0x%p\n",
 331                __func__, dfu->name, buf, size, blk_seq_num, dfu->i_buf);
 332
 333         if (!dfu->inited) {
 334                 dfu->i_buf_start = dfu_get_buf(dfu);
 335                 if (dfu->i_buf_start == NULL)
 336                         return -ENOMEM;
 337
 338                 dfu->r_left = dfu->get_medium_size(dfu);
 339                 if (dfu->r_left < 0)
 340                         return dfu->r_left;
 341
 342                 debug("%s: %s %ld [B]\n", __func__, dfu->name, dfu->r_left);
 343
 344                 dfu->i_blk_seq_num = 0;
 345                 dfu->crc = 0;
 346                 dfu->offset = 0;
 347                 dfu->i_buf_end = dfu_get_buf(dfu) + dfu_buf_size;
 348                 dfu->i_buf = dfu->i_buf_start;
 349                 dfu->b_left = 0;
 350
 351                 dfu->bad_skip = 0;
 352
 353                 dfu->inited = 1;
 354         }
 355
 356         if (dfu->i_blk_seq_num != blk_seq_num) {
 357                 printf("%s: Wrong sequence number! [%d] [%d]\n",
 358                        __func__, dfu->i_blk_seq_num, blk_seq_num);
 359                 return -1;
 360         }
 361         /* handle rollover */
 362         dfu->i_blk_seq_num = (dfu->i_blk_seq_num + 1) & 0xffff;
 363
 364         ret = dfu_read_buffer_fill(dfu, buf, size);
 365         if (ret < 0) {
 366                 printf("%s: Failed to fill buffer\n", __func__);
 367                 return -1;
 368         }
 369
 370         if (ret < size) {
 371                 if (dfu_hash_algo)
 372                         debug("%s: %s %s: 0x%x\n", __func__, dfu->name,
 373                               dfu_hash_algo->name, dfu->crc);
 374                 puts("\nUPLOAD ... done\nCtrl+C to exit ...\n");
 375
 376                 dfu->i_blk_seq_num = 0;
 377                 dfu->crc = 0;
 378                 dfu->offset = 0;
 379                 dfu->i_buf_start = dfu_buf;
 380                 dfu->i_buf_end = dfu_buf;
 381                 dfu->i_buf = dfu->i_buf_start;
 382                 dfu->b_left = 0;
 383
 384                 dfu->bad_skip = 0;
 385
 386                 dfu->inited = 0;
 387         }
 388
 389         return ret;
 390 }
 391
 392 static int dfu_fill_entity(struct dfu_entity *dfu, char *s, int alt,
 393                            char *interface, char *devstr)
 394 {
 395         char *st;
 396
 397         debug("%s: %s interface: %s dev: %s\n", __func__, s, interface, devstr);
 398         st = strsep(&s, " ");
 399         strcpy(dfu->name, st);
 400
 401         dfu->alt = alt;
 402         dfu->max_buf_size = 0;
 403         dfu->free_entity = NULL;
 404
 405         /* Specific for mmc device */
 406         if (strcmp(interface, "mmc") == 0) {
 407                 if (dfu_fill_entity_mmc(dfu, devstr, s))
 408                         return -1;
 409         } else if (strcmp(interface, "nand") == 0) {
 410                 if (dfu_fill_entity_nand(dfu, devstr, s))
 411                         return -1;
 412         } else if (strcmp(interface, "ram") == 0) {
 413                 if (dfu_fill_entity_ram(dfu, devstr, s))
 414                         return -1;
 415         } else if (strcmp(interface, "sf") == 0) {
 416                 if (dfu_fill_entity_sf(dfu, devstr, s))
 417                         return -1;
 418         } else {
 419                 printf("%s: Device %s not (yet) supported!\n",
 420                        __func__,  interface);
 421                 return -1;
 422         }
 423         dfu_get_buf(dfu);
 424
 425         return 0;
 426 }
 427
 428 void dfu_free_entities(void)
 429 {
 430         struct dfu_entity *dfu, *p, *t = NULL;
 431
 432         dfu_free_buf();
 433         list_for_each_entry_safe_reverse(dfu, p, &dfu_list, list) {
 434                 list_del(&dfu->list);
 435                 if (dfu->free_entity)
 436                         dfu->free_entity(dfu);
 437                 t = dfu;
 438         }
 439         if (t)
 440                 free(t);
 441         INIT_LIST_HEAD(&dfu_list);
 442
 443         alt_num_cnt = 0;
 444 }
 445
 446 int dfu_config_entities(char *env, char *interface, char *devstr)
 447 {
 448         struct dfu_entity *dfu;
 449         int i, ret;
 450         char *s;
 451
 452         dfu_alt_num = dfu_find_alt_num(env);
 453         debug("%s: dfu_alt_num=%d\n", __func__, dfu_alt_num);
 454
 455         dfu_hash_algo = NULL;
 456         s = dfu_get_hash_algo();
 457         if (s) {
 458                 ret = hash_lookup_algo(s, &dfu_hash_algo);
 459                 if (ret)
 460                         error("Hash algorithm %s not supported\n", s);
 461         }
 462
 463         dfu = calloc(sizeof(*dfu), dfu_alt_num);
 464         if (!dfu)
 465                 return -1;
 466         for (i = 0; i < dfu_alt_num; i++) {
 467
 468                 s = strsep(&env, ";");
 469                 ret = dfu_fill_entity(&dfu[i], s, alt_num_cnt, interface,
 470                                       devstr);
 471                 if (ret) {
 472                         free(dfu);
 473                         return -1;
 474                 }
 475
 476                 list_add_tail(&dfu[i].list, &dfu_list);
 477                 alt_num_cnt++;
 478         }
 479
 480         return 0;
 481 }
 482
 483 const char *dfu_get_dev_type(enum dfu_device_type t)
 484 {
 485         const char *dev_t[] = {NULL, "eMMC", "OneNAND", "NAND", "RAM" };
 486         return dev_t[t];
 487 }
 488
 489 const char *dfu_get_layout(enum dfu_layout l)
 490 {
 491         const char *dfu_layout[] = {NULL, "RAW_ADDR", "FAT", "EXT2",
 492                                            "EXT3", "EXT4", "RAM_ADDR" };
 493         return dfu_layout[l];
 494 }
 495
 496 void dfu_show_entities(void)
 497 {
 498         struct dfu_entity *dfu;
 499
 500         puts("DFU alt settings list:\n");
 501
 502         list_for_each_entry(dfu, &dfu_list, list) {
 503                 printf("dev: %s alt: %d name: %s layout: %s\n",
 504                        dfu_get_dev_type(dfu->dev_type), dfu->alt,
 505                        dfu->name, dfu_get_layout(dfu->layout));
 506         }
 507 }
 508
 509 int dfu_get_alt_number(void)
 510 {
 511         return dfu_alt_num;
 512 }
 513
 514 struct dfu_entity *dfu_get_entity(int alt)
 515 {
 516         struct dfu_entity *dfu;
 517
 518         list_for_each_entry(dfu, &dfu_list, list) {
 519                 if (dfu->alt == alt)
 520                         return dfu;
 521         }
 522
 523         return NULL;
 524 }
 525
 526 int dfu_get_alt(char *name)
 527 {
 528         struct dfu_entity *dfu;
 529         char *str;
 530
 531         list_for_each_entry(dfu, &dfu_list, list) {
 532                 if (dfu->name[0] != '/') {
 533                         if (!strncmp(dfu->name, name, strlen(dfu->name)))
 534                                 return dfu->alt;
 535                 } else {
 536                         /*
 537                          * One must also consider absolute path
 538                          * (/boot/bin/uImage) available at dfu->name when
 539                          * compared "plain" file name (uImage)
 540                          *
 541                          * It is the case for e.g. thor gadget where lthor SW
 542                          * sends only the file name, so only the very last part
 543                          * of path must be checked for equality
 544                          */
 545
 546                         str = strstr(dfu->name, name);
 547                         if (!str)
 548                                 continue;
 549
 550                         /*
 551                          * Check if matching substring is the last element of
 552                          * dfu->name (uImage)
 553                          */
 554                         if (strlen(dfu->name) ==
 555                             ((str - dfu->name) + strlen(name)))
 556                                 return dfu->alt;
 557                 }
 558         }
 559
 560         return -ENODEV;
 561 }
 562
 563 int dfu_write_from_mem_addr(struct dfu_entity *dfu, void *buf, int size)
 564 {
 565         unsigned long dfu_buf_size, write, left = size;
 566         int i, ret = 0;
 567         void *dp = buf;
 568
 569         /*
 570          * Here we must call dfu_get_buf(dfu) first to be sure that dfu_buf_size
 571          * has been properly initialized - e.g. if "dfu_bufsiz" has been taken
 572          * into account.
 573          */
 574         dfu_get_buf(dfu);
 575         dfu_buf_size = dfu_get_buf_size();
 576         debug("%s: dfu buf size: %lu\n", __func__, dfu_buf_size);
 577
 578         for (i = 0; left > 0; i++) {
 579                 write = min(dfu_buf_size, left);
 580
 581                 debug("%s: dp: 0x%p left: %lu write: %lu\n", __func__,
 582                       dp, left, write);
 583                 ret = dfu_write(dfu, dp, write, i);
 584                 if (ret) {
 585                         error("DFU write failed\n");
 586                         return ret;
 587                 }
 588
 589                 dp += write;
 590                 left -= write;
 591         }
 592
 593         ret = dfu_flush(dfu, NULL, 0, i);
 594         if (ret)
 595                 error("DFU flush failed!");
 596
 597         return ret;
 598 }