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 bool dfu_reset_request;
  21 static LIST_HEAD(dfu_list);
  22 static int dfu_alt_num;
  23 static int alt_num_cnt;
  24 static struct hash_algo *dfu_hash_algo;
  25
  26 bool dfu_reset(void)
  27 {
  28         return dfu_reset_request;
  29 }
  30
  31 void dfu_trigger_reset()
  32 {
  33         dfu_reset_request = true;
  34 }
  35
  36 static int dfu_find_alt_num(const char *s)
  37 {
  38         int i = 0;
  39
  40         for (; *s; s++)
  41                 if (*s == ';')
  42                         i++;
  43
  44         return ++i;
  45 }
  46
  47 int dfu_init_env_entities(char *interface, char *devstr)
  48 {
  49         const char *str_env;
  50         char *env_bkp;
  51         int ret;
  52
  53         str_env = getenv("dfu_alt_info");
  54         if (!str_env) {
  55                 error("\"dfu_alt_info\" env variable not defined!\n");
  56                 return -EINVAL;
  57         }
  58
  59         env_bkp = strdup(str_env);
  60         ret = dfu_config_entities(env_bkp, interface, devstr);
  61         if (ret) {
  62                 error("DFU entities configuration failed!\n");
  63                 return ret;
  64         }
  65
  66         free(env_bkp);
  67         return 0;
  68 }
  69
  70 static unsigned char *dfu_buf;
  71 static unsigned long dfu_buf_size = CONFIG_SYS_DFU_DATA_BUF_SIZE;
  72
  73 unsigned char *dfu_free_buf(void)
  74 {
  75         free(dfu_buf);
  76         dfu_buf = NULL;
  77         return dfu_buf;
  78 }
  79
  80 unsigned long dfu_get_buf_size(void)
  81 {
  82         return dfu_buf_size;
  83 }
  84
  85 unsigned char *dfu_get_buf(struct dfu_entity *dfu)
  86 {
  87         char *s;
  88
  89         if (dfu_buf != NULL)
  90                 return dfu_buf;
  91
  92         s = getenv("dfu_bufsiz");
  93         dfu_buf_size = s ? (unsigned long)simple_strtol(s, NULL, 16) :
  94                         CONFIG_SYS_DFU_DATA_BUF_SIZE;
  95         if (dfu->max_buf_size && dfu_buf_size > dfu->max_buf_size)
  96                 dfu_buf_size = dfu->max_buf_size;
  97
  98         dfu_buf = memalign(CONFIG_SYS_CACHELINE_SIZE, dfu_buf_size);
  99         if (dfu_buf == NULL)
 100                 printf("%s: Could not memalign 0x%lx bytes\n",
 101                        __func__, dfu_buf_size);
 102
 103         return dfu_buf;
 104 }
 105
 106 static char *dfu_get_hash_algo(void)
 107 {
 108         char *s;
 109
 110         s = getenv("dfu_hash_algo");
 111         if (!s)
 112                 return NULL;
 113
 114         if (!strcmp(s, "crc32")) {
 115                 debug("%s: DFU hash method: %s\n", __func__, s);
 116                 return s;
 117         }
 118
 119         error("DFU hash method: %s not supported!\n", s);
 120         return NULL;
 121 }
 122
 123 static int dfu_write_buffer_drain(struct dfu_entity *dfu)
 124 {
 125         long w_size;
 126         int ret;
 127
 128         /* flush size? */
 129         w_size = dfu->i_buf - dfu->i_buf_start;
 130         if (w_size == 0)
 131                 return 0;
 132
 133         if (dfu_hash_algo)
 134                 dfu_hash_algo->hash_update(dfu_hash_algo, &dfu->crc,
 135                                            dfu->i_buf_start, w_size, 0);
 136
 137         ret = dfu->write_medium(dfu, dfu->offset, dfu->i_buf_start, &w_size);
 138         if (ret)
 139                 debug("%s: Write error!\n", __func__);
 140
 141         /* point back */
 142         dfu->i_buf = dfu->i_buf_start;
 143
 144         /* update offset */
 145         dfu->offset += w_size;
 146
 147         puts("#");
 148
 149         return ret;
 150 }
 151
 152 void dfu_write_transaction_cleanup(struct dfu_entity *dfu)
 153 {
 154         /* clear everything */
 155         dfu_free_buf();
 156         dfu->crc = 0;
 157         dfu->offset = 0;
 158         dfu->i_blk_seq_num = 0;
 159         dfu->i_buf_start = dfu_buf;
 160         dfu->i_buf_end = dfu_buf;
 161         dfu->i_buf = dfu->i_buf_start;
 162         dfu->inited = 0;
 163 }
 164
 165 int dfu_flush(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 166 {
 167         int ret = 0;
 168
 169         ret = dfu_write_buffer_drain(dfu);
 170         if (ret)
 171                 return ret;
 172
 173         if (dfu->flush_medium)
 174                 ret = dfu->flush_medium(dfu);
 175
 176         if (dfu_hash_algo)
 177                 printf("\nDFU complete %s: 0x%08x\n", dfu_hash_algo->name,
 178                        dfu->crc);
 179
 180         dfu_write_transaction_cleanup(dfu);
 181
 182         return ret;
 183 }
 184
 185 int dfu_write(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 186 {
 187         int ret;
 188
 189         debug("%s: name: %s buf: 0x%p size: 0x%x p_num: 0x%x offset: 0x%llx bufoffset: 0x%x\n",
 190               __func__, dfu->name, buf, size, blk_seq_num, dfu->offset,
 191               dfu->i_buf - dfu->i_buf_start);
 192
 193         if (!dfu->inited) {
 194                 /* initial state */
 195                 dfu->crc = 0;
 196                 dfu->offset = 0;
 197                 dfu->bad_skip = 0;
 198                 dfu->i_blk_seq_num = 0;
 199                 dfu->i_buf_start = dfu_get_buf(dfu);
 200                 if (dfu->i_buf_start == NULL)
 201                         return -ENOMEM;
 202                 dfu->i_buf_end = dfu_get_buf(dfu) + dfu_buf_size;
 203                 dfu->i_buf = dfu->i_buf_start;
 204
 205                 dfu->inited = 1;
 206         }
 207
 208         if (dfu->i_blk_seq_num != blk_seq_num) {
 209                 printf("%s: Wrong sequence number! [%d] [%d]\n",
 210                        __func__, dfu->i_blk_seq_num, blk_seq_num);
 211                 dfu_write_transaction_cleanup(dfu);
 212                 return -1;
 213         }
 214
 215         /* DFU 1.1 standard says:
 216          * The wBlockNum field is a block sequence number. It increments each
 217          * time a block is transferred, wrapping to zero from 65,535. It is used
 218          * to provide useful context to the DFU loader in the device."
 219          *
 220          * This means that it's a 16 bit counter that roll-overs at
 221          * 0xffff -> 0x0000. By having a typical 4K transfer block
 222          * we roll-over at exactly 256MB. Not very fun to debug.
 223          *
 224          * Handling rollover, and having an inited variable,
 225          * makes things work.
 226          */
 227
 228         /* handle rollover */
 229         dfu->i_blk_seq_num = (dfu->i_blk_seq_num + 1) & 0xffff;
 230
 231         /* flush buffer if overflow */
 232         if ((dfu->i_buf + size) > dfu->i_buf_end) {
 233                 ret = dfu_write_buffer_drain(dfu);
 234                 if (ret) {
 235                         dfu_write_transaction_cleanup(dfu);
 236                         return ret;
 237                 }
 238         }
 239
 240         /* we should be in buffer now (if not then size too large) */
 241         if ((dfu->i_buf + size) > dfu->i_buf_end) {
 242                 error("Buffer overflow! (0x%p + 0x%x > 0x%p)\n", dfu->i_buf,
 243                       size, dfu->i_buf_end);
 244                 dfu_write_transaction_cleanup(dfu);
 245                 return -1;
 246         }
 247
 248         memcpy(dfu->i_buf, buf, size);
 249         dfu->i_buf += size;
 250
 251         /* if end or if buffer full flush */
 252         if (size == 0 || (dfu->i_buf + size) > dfu->i_buf_end) {
 253                 ret = dfu_write_buffer_drain(dfu);
 254                 if (ret) {
 255                         dfu_write_transaction_cleanup(dfu);
 256                         return ret;
 257                 }
 258         }
 259
 260         return 0;
 261 }
 262
 263 static int dfu_read_buffer_fill(struct dfu_entity *dfu, void *buf, int size)
 264 {
 265         long chunk;
 266         int ret, readn;
 267
 268         readn = 0;
 269         while (size > 0) {
 270                 /* get chunk that can be read */
 271                 chunk = min(size, dfu->b_left);
 272                 /* consume */
 273                 if (chunk > 0) {
 274                         memcpy(buf, dfu->i_buf, chunk);
 275                         if (dfu_hash_algo)
 276                                 dfu_hash_algo->hash_update(dfu_hash_algo,
 277                                                            &dfu->crc, buf,
 278                                                            chunk, 0);
 279
 280                         dfu->i_buf += chunk;
 281                         dfu->b_left -= chunk;
 282                         size -= chunk;
 283                         buf += chunk;
 284                         readn += chunk;
 285                 }
 286
 287                 /* all done */
 288                 if (size > 0) {
 289                         /* no more to read */
 290                         if (dfu->r_left == 0)
 291                                 break;
 292
 293                         dfu->i_buf = dfu->i_buf_start;
 294                         dfu->b_left = dfu->i_buf_end - dfu->i_buf_start;
 295
 296                         /* got to read, but buffer is empty */
 297                         if (dfu->b_left > dfu->r_left)
 298                                 dfu->b_left = dfu->r_left;
 299                         ret = dfu->read_medium(dfu, dfu->offset, dfu->i_buf,
 300                                         &dfu->b_left);
 301                         if (ret != 0) {
 302                                 debug("%s: Read error!\n", __func__);
 303                                 return ret;
 304                         }
 305                         dfu->offset += dfu->b_left;
 306                         dfu->r_left -= dfu->b_left;
 307
 308                         puts("#");
 309                 }
 310         }
 311
 312         return readn;
 313 }
 314
 315 int dfu_read(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 316 {
 317         int ret = 0;
 318
 319         debug("%s: name: %s buf: 0x%p size: 0x%x p_num: 0x%x i_buf: 0x%p\n",
 320                __func__, dfu->name, buf, size, blk_seq_num, dfu->i_buf);
 321
 322         if (!dfu->inited) {
 323                 dfu->i_buf_start = dfu_get_buf(dfu);
 324                 if (dfu->i_buf_start == NULL)
 325                         return -ENOMEM;
 326
 327                 dfu->r_left = dfu->get_medium_size(dfu);
 328                 if (dfu->r_left < 0)
 329                         return dfu->r_left;
 330                 switch (dfu->layout) {
 331                 case DFU_RAW_ADDR:
 332                 case DFU_RAM_ADDR:
 333                         break;
 334                 default:
 335                         if (dfu->r_left > dfu_buf_size) {
 336                                 printf("%s: File too big for buffer\n",
 337                                        __func__);
 338                                 return -EOVERFLOW;
 339                         }
 340                 }
 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_free_buf();
 377                 dfu->i_blk_seq_num = 0;
 378                 dfu->crc = 0;
 379                 dfu->offset = 0;
 380                 dfu->i_buf_start = dfu_buf;
 381                 dfu->i_buf_end = dfu_buf;
 382                 dfu->i_buf = dfu->i_buf_start;
 383                 dfu->b_left = 0;
 384
 385                 dfu->bad_skip = 0;
 386
 387                 dfu->inited = 0;
 388         }
 389
 390         return ret;
 391 }
 392
 393 static int dfu_fill_entity(struct dfu_entity *dfu, char *s, int alt,
 394                            char *interface, char *devstr)
 395 {
 396         char *st;
 397
 398         debug("%s: %s interface: %s dev: %s\n", __func__, s, interface, devstr);
 399         st = strsep(&s, " ");
 400         strcpy(dfu->name, st);
 401
 402         dfu->alt = alt;
 403         dfu->max_buf_size = 0;
 404         dfu->free_entity = NULL;
 405
 406         /* Specific for mmc device */
 407         if (strcmp(interface, "mmc") == 0) {
 408                 if (dfu_fill_entity_mmc(dfu, devstr, s))
 409                         return -1;
 410         } else if (strcmp(interface, "nand") == 0) {
 411                 if (dfu_fill_entity_nand(dfu, devstr, s))
 412                         return -1;
 413         } else if (strcmp(interface, "ram") == 0) {
 414                 if (dfu_fill_entity_ram(dfu, devstr, s))
 415                         return -1;
 416         } else if (strcmp(interface, "sf") == 0) {
 417                 if (dfu_fill_entity_sf(dfu, devstr, s))
 418                         return -1;
 419         } else {
 420                 printf("%s: Device %s not (yet) supported!\n",
 421                        __func__,  interface);
 422                 return -1;
 423         }
 424
 425         return 0;
 426 }
 427
 428 void dfu_free_entities(void)
 429 {
 430         struct dfu_entity *dfu, *p, *t = NULL;
 431
 432         list_for_each_entry_safe_reverse(dfu, p, &dfu_list, list) {
 433                 list_del(&dfu->list);
 434                 if (dfu->free_entity)
 435                         dfu->free_entity(dfu);
 436                 t = dfu;
 437         }
 438         if (t)
 439                 free(t);
 440         INIT_LIST_HEAD(&dfu_list);
 441
 442         alt_num_cnt = 0;
 443 }
 444
 445 int dfu_config_entities(char *env, char *interface, char *devstr)
 446 {
 447         struct dfu_entity *dfu;
 448         int i, ret;
 449         char *s;
 450
 451         dfu_alt_num = dfu_find_alt_num(env);
 452         debug("%s: dfu_alt_num=%d\n", __func__, dfu_alt_num);
 453
 454         dfu_hash_algo = NULL;
 455         s = dfu_get_hash_algo();
 456         if (s) {
 457                 ret = hash_lookup_algo(s, &dfu_hash_algo);
 458                 if (ret)
 459                         error("Hash algorithm %s not supported\n", s);
 460         }
 461
 462         dfu = calloc(sizeof(*dfu), dfu_alt_num);
 463         if (!dfu)
 464                 return -1;
 465         for (i = 0; i < dfu_alt_num; i++) {
 466
 467                 s = strsep(&env, ";");
 468                 ret = dfu_fill_entity(&dfu[i], s, alt_num_cnt, interface,
 469                                       devstr);
 470                 if (ret)
 471                         return -1;
 472
 473                 list_add_tail(&dfu[i].list, &dfu_list);
 474                 alt_num_cnt++;
 475         }
 476
 477         return 0;
 478 }
 479
 480 const char *dfu_get_dev_type(enum dfu_device_type t)
 481 {
 482         const char *dev_t[] = {NULL, "eMMC", "OneNAND", "NAND", "RAM" };
 483         return dev_t[t];
 484 }
 485
 486 const char *dfu_get_layout(enum dfu_layout l)
 487 {
 488         const char *dfu_layout[] = {NULL, "RAW_ADDR", "FAT", "EXT2",
 489                                            "EXT3", "EXT4", "RAM_ADDR" };
 490         return dfu_layout[l];
 491 }
 492
 493 void dfu_show_entities(void)
 494 {
 495         struct dfu_entity *dfu;
 496
 497         puts("DFU alt settings list:\n");
 498
 499         list_for_each_entry(dfu, &dfu_list, list) {
 500                 printf("dev: %s alt: %d name: %s layout: %s\n",
 501                        dfu_get_dev_type(dfu->dev_type), dfu->alt,
 502                        dfu->name, dfu_get_layout(dfu->layout));
 503         }
 504 }
 505
 506 int dfu_get_alt_number(void)
 507 {
 508         return dfu_alt_num;
 509 }
 510
 511 struct dfu_entity *dfu_get_entity(int alt)
 512 {
 513         struct dfu_entity *dfu;
 514
 515         list_for_each_entry(dfu, &dfu_list, list) {
 516                 if (dfu->alt == alt)
 517                         return dfu;
 518         }
 519
 520         return NULL;
 521 }
 522
 523 int dfu_get_alt(char *name)
 524 {
 525         struct dfu_entity *dfu;
 526
 527         list_for_each_entry(dfu, &dfu_list, list) {
 528                 if (!strncmp(dfu->name, name, strlen(dfu->name)))
 529                         return dfu->alt;
 530         }
 531
 532         return -ENODEV;
 533 }