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 = CONFIG_SYS_DFU_DATA_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_free_buf(); 168 dfu->crc = 0; 169 dfu->offset = 0; 170 dfu->i_blk_seq_num = 0; 171 dfu->i_buf_start = dfu_buf; 172 dfu->i_buf_end = dfu_buf; 173 dfu->i_buf = dfu->i_buf_start; 174 dfu->inited = 0; 175 } 176 177 int dfu_flush(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num) 178 { 179 int ret = 0; 180 181 ret = dfu_write_buffer_drain(dfu); 182 if (ret) 183 return ret; 184 185 if (dfu->flush_medium) 186 ret = dfu->flush_medium(dfu); 187 188 if (dfu_hash_algo) 189 printf("\nDFU complete %s: 0x%08x\n", dfu_hash_algo->name, 190 dfu->crc); 191 192 dfu_write_transaction_cleanup(dfu); 193 194 return ret; 195 } 196 197 int dfu_write(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num) 198 { 199 int ret; 200 201 debug("%s: name: %s buf: 0x%p size: 0x%x p_num: 0x%x offset: 0x%llx bufoffset: 0x%x\n", 202 __func__, dfu->name, buf, size, blk_seq_num, dfu->offset, 203 dfu->i_buf - dfu->i_buf_start); 204 205 if (!dfu->inited) { 206 /* initial state */ 207 dfu->crc = 0; 208 dfu->offset = 0; 209 dfu->bad_skip = 0; 210 dfu->i_blk_seq_num = 0; 211 dfu->i_buf_start = dfu_get_buf(dfu); 212 if (dfu->i_buf_start == NULL) 213 return -ENOMEM; 214 dfu->i_buf_end = dfu_get_buf(dfu) + dfu_buf_size; 215 dfu->i_buf = dfu->i_buf_start; 216 217 dfu->inited = 1; 218 } 219 220 if (dfu->i_blk_seq_num != blk_seq_num) { 221 printf("%s: Wrong sequence number! [%d] [%d]\n", 222 __func__, dfu->i_blk_seq_num, blk_seq_num); 223 dfu_write_transaction_cleanup(dfu); 224 return -1; 225 } 226 227 /* DFU 1.1 standard says: 228 * The wBlockNum field is a block sequence number. It increments each 229 * time a block is transferred, wrapping to zero from 65,535. It is used 230 * to provide useful context to the DFU loader in the device." 231 * 232 * This means that it's a 16 bit counter that roll-overs at 233 * 0xffff -> 0x0000. By having a typical 4K transfer block 234 * we roll-over at exactly 256MB. Not very fun to debug. 235 * 236 * Handling rollover, and having an inited variable, 237 * makes things work. 238 */ 239 240 /* handle rollover */ 241 dfu->i_blk_seq_num = (dfu->i_blk_seq_num + 1) & 0xffff; 242 243 /* flush buffer if overflow */ 244 if ((dfu->i_buf + size) > dfu->i_buf_end) { 245 ret = dfu_write_buffer_drain(dfu); 246 if (ret) { 247 dfu_write_transaction_cleanup(dfu); 248 return ret; 249 } 250 } 251 252 /* we should be in buffer now (if not then size too large) */ 253 if ((dfu->i_buf + size) > dfu->i_buf_end) { 254 error("Buffer overflow! (0x%p + 0x%x > 0x%p)\n", dfu->i_buf, 255 size, dfu->i_buf_end); 256 dfu_write_transaction_cleanup(dfu); 257 return -1; 258 } 259 260 memcpy(dfu->i_buf, buf, size); 261 dfu->i_buf += size; 262 263 /* if end or if buffer full flush */ 264 if (size == 0 || (dfu->i_buf + size) > dfu->i_buf_end) { 265 ret = dfu_write_buffer_drain(dfu); 266 if (ret) { 267 dfu_write_transaction_cleanup(dfu); 268 return ret; 269 } 270 } 271 272 return 0; 273 } 274 275 static int dfu_read_buffer_fill(struct dfu_entity *dfu, void *buf, int size) 276 { 277 long chunk; 278 int ret, readn; 279 280 readn = 0; 281 while (size > 0) { 282 /* get chunk that can be read */ 283 chunk = min((long)size, dfu->b_left); 284 /* consume */ 285 if (chunk > 0) { 286 memcpy(buf, dfu->i_buf, chunk); 287 if (dfu_hash_algo) 288 dfu_hash_algo->hash_update(dfu_hash_algo, 289 &dfu->crc, buf, 290 chunk, 0); 291 292 dfu->i_buf += chunk; 293 dfu->b_left -= chunk; 294 size -= chunk; 295 buf += chunk; 296 readn += chunk; 297 } 298 299 /* all done */ 300 if (size > 0) { 301 /* no more to read */ 302 if (dfu->r_left == 0) 303 break; 304 305 dfu->i_buf = dfu->i_buf_start; 306 dfu->b_left = dfu->i_buf_end - dfu->i_buf_start; 307 308 /* got to read, but buffer is empty */ 309 if (dfu->b_left > dfu->r_left) 310 dfu->b_left = dfu->r_left; 311 ret = dfu->read_medium(dfu, dfu->offset, dfu->i_buf, 312 &dfu->b_left); 313 if (ret != 0) { 314 debug("%s: Read error!\n", __func__); 315 return ret; 316 } 317 dfu->offset += dfu->b_left; 318 dfu->r_left -= dfu->b_left; 319 320 puts("#"); 321 } 322 } 323 324 return readn; 325 } 326 327 int dfu_read(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num) 328 { 329 int ret = 0; 330 331 debug("%s: name: %s buf: 0x%p size: 0x%x p_num: 0x%x i_buf: 0x%p\n", 332 __func__, dfu->name, buf, size, blk_seq_num, dfu->i_buf); 333 334 if (!dfu->inited) { 335 dfu->i_buf_start = dfu_get_buf(dfu); 336 if (dfu->i_buf_start == NULL) 337 return -ENOMEM; 338 339 dfu->r_left = dfu->get_medium_size(dfu); 340 if (dfu->r_left < 0) 341 return dfu->r_left; 342 switch (dfu->layout) { 343 case DFU_RAW_ADDR: 344 case DFU_RAM_ADDR: 345 break; 346 default: 347 if (dfu->r_left > dfu_buf_size) { 348 printf("%s: File too big for buffer\n", 349 __func__); 350 return -EOVERFLOW; 351 } 352 } 353 354 debug("%s: %s %ld [B]\n", __func__, dfu->name, dfu->r_left); 355 356 dfu->i_blk_seq_num = 0; 357 dfu->crc = 0; 358 dfu->offset = 0; 359 dfu->i_buf_end = dfu_get_buf(dfu) + dfu_buf_size; 360 dfu->i_buf = dfu->i_buf_start; 361 dfu->b_left = 0; 362 363 dfu->bad_skip = 0; 364 365 dfu->inited = 1; 366 } 367 368 if (dfu->i_blk_seq_num != blk_seq_num) { 369 printf("%s: Wrong sequence number! [%d] [%d]\n", 370 __func__, dfu->i_blk_seq_num, blk_seq_num); 371 return -1; 372 } 373 /* handle rollover */ 374 dfu->i_blk_seq_num = (dfu->i_blk_seq_num + 1) & 0xffff; 375 376 ret = dfu_read_buffer_fill(dfu, buf, size); 377 if (ret < 0) { 378 printf("%s: Failed to fill buffer\n", __func__); 379 return -1; 380 } 381 382 if (ret < size) { 383 if (dfu_hash_algo) 384 debug("%s: %s %s: 0x%x\n", __func__, dfu->name, 385 dfu_hash_algo->name, dfu->crc); 386 puts("\nUPLOAD ... done\nCtrl+C to exit ...\n"); 387 388 dfu_free_buf(); 389 dfu->i_blk_seq_num = 0; 390 dfu->crc = 0; 391 dfu->offset = 0; 392 dfu->i_buf_start = dfu_buf; 393 dfu->i_buf_end = dfu_buf; 394 dfu->i_buf = dfu->i_buf_start; 395 dfu->b_left = 0; 396 397 dfu->bad_skip = 0; 398 399 dfu->inited = 0; 400 } 401 402 return ret; 403 } 404 405 static int dfu_fill_entity(struct dfu_entity *dfu, char *s, int alt, 406 char *interface, char *devstr) 407 { 408 char *st; 409 410 debug("%s: %s interface: %s dev: %s\n", __func__, s, interface, devstr); 411 st = strsep(&s, " "); 412 strcpy(dfu->name, st); 413 414 dfu->alt = alt; 415 dfu->max_buf_size = 0; 416 dfu->free_entity = NULL; 417 418 /* Specific for mmc device */ 419 if (strcmp(interface, "mmc") == 0) { 420 if (dfu_fill_entity_mmc(dfu, devstr, s)) 421 return -1; 422 } else if (strcmp(interface, "nand") == 0) { 423 if (dfu_fill_entity_nand(dfu, devstr, s)) 424 return -1; 425 } else if (strcmp(interface, "ram") == 0) { 426 if (dfu_fill_entity_ram(dfu, devstr, s)) 427 return -1; 428 } else if (strcmp(interface, "sf") == 0) { 429 if (dfu_fill_entity_sf(dfu, devstr, s)) 430 return -1; 431 } else { 432 printf("%s: Device %s not (yet) supported!\n", 433 __func__, interface); 434 return -1; 435 } 436 437 return 0; 438 } 439 440 void dfu_free_entities(void) 441 { 442 struct dfu_entity *dfu, *p, *t = NULL; 443 444 list_for_each_entry_safe_reverse(dfu, p, &dfu_list, list) { 445 list_del(&dfu->list); 446 if (dfu->free_entity) 447 dfu->free_entity(dfu); 448 t = dfu; 449 } 450 if (t) 451 free(t); 452 INIT_LIST_HEAD(&dfu_list); 453 454 alt_num_cnt = 0; 455 } 456 457 int dfu_config_entities(char *env, char *interface, char *devstr) 458 { 459 struct dfu_entity *dfu; 460 int i, ret; 461 char *s; 462 463 dfu_alt_num = dfu_find_alt_num(env); 464 debug("%s: dfu_alt_num=%d\n", __func__, dfu_alt_num); 465 466 dfu_hash_algo = NULL; 467 s = dfu_get_hash_algo(); 468 if (s) { 469 ret = hash_lookup_algo(s, &dfu_hash_algo); 470 if (ret) 471 error("Hash algorithm %s not supported\n", s); 472 } 473 474 dfu = calloc(sizeof(*dfu), dfu_alt_num); 475 if (!dfu) 476 return -1; 477 for (i = 0; i < dfu_alt_num; i++) { 478 479 s = strsep(&env, ";"); 480 ret = dfu_fill_entity(&dfu[i], s, alt_num_cnt, interface, 481 devstr); 482 if (ret) 483 return -1; 484 485 list_add_tail(&dfu[i].list, &dfu_list); 486 alt_num_cnt++; 487 } 488 489 return 0; 490 } 491 492 const char *dfu_get_dev_type(enum dfu_device_type t) 493 { 494 const char *dev_t[] = {NULL, "eMMC", "OneNAND", "NAND", "RAM" }; 495 return dev_t[t]; 496 } 497 498 const char *dfu_get_layout(enum dfu_layout l) 499 { 500 const char *dfu_layout[] = {NULL, "RAW_ADDR", "FAT", "EXT2", 501 "EXT3", "EXT4", "RAM_ADDR" }; 502 return dfu_layout[l]; 503 } 504 505 void dfu_show_entities(void) 506 { 507 struct dfu_entity *dfu; 508 509 puts("DFU alt settings list:\n"); 510 511 list_for_each_entry(dfu, &dfu_list, list) { 512 printf("dev: %s alt: %d name: %s layout: %s\n", 513 dfu_get_dev_type(dfu->dev_type), dfu->alt, 514 dfu->name, dfu_get_layout(dfu->layout)); 515 } 516 } 517 518 int dfu_get_alt_number(void) 519 { 520 return dfu_alt_num; 521 } 522 523 struct dfu_entity *dfu_get_entity(int alt) 524 { 525 struct dfu_entity *dfu; 526 527 list_for_each_entry(dfu, &dfu_list, list) { 528 if (dfu->alt == alt) 529 return dfu; 530 } 531 532 return NULL; 533 } 534 535 int dfu_get_alt(char *name) 536 { 537 struct dfu_entity *dfu; 538 char *str; 539 540 list_for_each_entry(dfu, &dfu_list, list) { 541 if (dfu->name[0] != '/') { 542 if (!strncmp(dfu->name, name, strlen(dfu->name))) 543 return dfu->alt; 544 } else { 545 /* 546 * One must also consider absolute path 547 * (/boot/bin/uImage) available at dfu->name when 548 * compared "plain" file name (uImage) 549 * 550 * It is the case for e.g. thor gadget where lthor SW 551 * sends only the file name, so only the very last part 552 * of path must be checked for equality 553 */ 554 555 str = strstr(dfu->name, name); 556 if (!str) 557 continue; 558 559 /* 560 * Check if matching substring is the last element of 561 * dfu->name (uImage) 562 */ 563 if (strlen(dfu->name) == 564 ((str - dfu->name) + strlen(name))) 565 return dfu->alt; 566 } 567 } 568 569 return -ENODEV; 570 } 571