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 <linux/list.h>
  17 #include <linux/compiler.h>
  18
  19 static bool dfu_reset_request;
  20 static LIST_HEAD(dfu_list);
  21 static int dfu_alt_num;
  22 static int alt_num_cnt;
  23
  24 bool dfu_reset(void)
  25 {
  26         return dfu_reset_request;
  27 }
  28
  29 void dfu_trigger_reset()
  30 {
  31         dfu_reset_request = true;
  32 }
  33
  34 static int dfu_find_alt_num(const char *s)
  35 {
  36         int i = 0;
  37
  38         for (; *s; s++)
  39                 if (*s == ';')
  40                         i++;
  41
  42         return ++i;
  43 }
  44
  45 int dfu_init_env_entities(char *interface, int dev)
  46 {
  47         const char *str_env;
  48         char *env_bkp;
  49         int ret;
  50
  51         str_env = getenv("dfu_alt_info");
  52         if (!str_env) {
  53                 error("\"dfu_alt_info\" env variable not defined!\n");
  54                 return -EINVAL;
  55         }
  56
  57         env_bkp = strdup(str_env);
  58         ret = dfu_config_entities(env_bkp, interface, dev);
  59         if (ret) {
  60                 error("DFU entities configuration failed!\n");
  61                 return ret;
  62         }
  63
  64         free(env_bkp);
  65         return 0;
  66 }
  67
  68 static unsigned char *dfu_buf;
  69 static unsigned long dfu_buf_size = CONFIG_SYS_DFU_DATA_BUF_SIZE;
  70
  71 unsigned char *dfu_free_buf(void)
  72 {
  73         free(dfu_buf);
  74         dfu_buf = NULL;
  75         return dfu_buf;
  76 }
  77
  78 unsigned long dfu_get_buf_size(void)
  79 {
  80         return dfu_buf_size;
  81 }
  82
  83 unsigned char *dfu_get_buf(void)
  84 {
  85         char *s;
  86
  87         if (dfu_buf != NULL)
  88                 return dfu_buf;
  89
  90         s = getenv("dfu_bufsiz");
  91         dfu_buf_size = s ? (unsigned long)simple_strtol(s, NULL, 16) :
  92                         CONFIG_SYS_DFU_DATA_BUF_SIZE;
  93
  94         dfu_buf = memalign(CONFIG_SYS_CACHELINE_SIZE, dfu_buf_size);
  95         if (dfu_buf == NULL)
  96                 printf("%s: Could not memalign 0x%lx bytes\n",
  97                        __func__, dfu_buf_size);
  98
  99         return dfu_buf;
 100 }
 101
 102 static int dfu_write_buffer_drain(struct dfu_entity *dfu)
 103 {
 104         long w_size;
 105         int ret;
 106
 107         /* flush size? */
 108         w_size = dfu->i_buf - dfu->i_buf_start;
 109         if (w_size == 0)
 110                 return 0;
 111
 112         /* update CRC32 */
 113         dfu->crc = crc32(dfu->crc, dfu->i_buf_start, w_size);
 114
 115         ret = dfu->write_medium(dfu, dfu->offset, dfu->i_buf_start, &w_size);
 116         if (ret)
 117                 debug("%s: Write error!\n", __func__);
 118
 119         /* point back */
 120         dfu->i_buf = dfu->i_buf_start;
 121
 122         /* update offset */
 123         dfu->offset += w_size;
 124
 125         puts("#");
 126
 127         return ret;
 128 }
 129
 130 int dfu_flush(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 131 {
 132         int ret = 0;
 133
 134         if (dfu->flush_medium)
 135                 ret = dfu->flush_medium(dfu);
 136
 137         printf("\nDFU complete CRC32: 0x%08x\n", dfu->crc);
 138
 139         /* clear everything */
 140         dfu_free_buf();
 141         dfu->crc = 0;
 142         dfu->offset = 0;
 143         dfu->i_blk_seq_num = 0;
 144         dfu->i_buf_start = dfu_buf;
 145         dfu->i_buf_end = dfu_buf;
 146         dfu->i_buf = dfu->i_buf_start;
 147         dfu->inited = 0;
 148
 149         return ret;
 150 }
 151
 152 int dfu_write(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 153 {
 154         int ret = 0;
 155         int tret;
 156
 157         debug("%s: name: %s buf: 0x%p size: 0x%x p_num: 0x%x offset: 0x%llx bufoffset: 0x%x\n",
 158               __func__, dfu->name, buf, size, blk_seq_num, dfu->offset,
 159               dfu->i_buf - dfu->i_buf_start);
 160
 161         if (!dfu->inited) {
 162                 /* initial state */
 163                 dfu->crc = 0;
 164                 dfu->offset = 0;
 165                 dfu->bad_skip = 0;
 166                 dfu->i_blk_seq_num = 0;
 167                 dfu->i_buf_start = dfu_get_buf();
 168                 if (dfu->i_buf_start == NULL)
 169                         return -ENOMEM;
 170                 dfu->i_buf_end = dfu_get_buf() + dfu_buf_size;
 171                 dfu->i_buf = dfu->i_buf_start;
 172
 173                 dfu->inited = 1;
 174         }
 175
 176         if (dfu->i_blk_seq_num != blk_seq_num) {
 177                 printf("%s: Wrong sequence number! [%d] [%d]\n",
 178                        __func__, dfu->i_blk_seq_num, blk_seq_num);
 179                 return -1;
 180         }
 181
 182         /* DFU 1.1 standard says:
 183          * The wBlockNum field is a block sequence number. It increments each
 184          * time a block is transferred, wrapping to zero from 65,535. It is used
 185          * to provide useful context to the DFU loader in the device."
 186          *
 187          * This means that it's a 16 bit counter that roll-overs at
 188          * 0xffff -> 0x0000. By having a typical 4K transfer block
 189          * we roll-over at exactly 256MB. Not very fun to debug.
 190          *
 191          * Handling rollover, and having an inited variable,
 192          * makes things work.
 193          */
 194
 195         /* handle rollover */
 196         dfu->i_blk_seq_num = (dfu->i_blk_seq_num + 1) & 0xffff;
 197
 198         /* flush buffer if overflow */
 199         if ((dfu->i_buf + size) > dfu->i_buf_end) {
 200                 tret = dfu_write_buffer_drain(dfu);
 201                 if (ret == 0)
 202                         ret = tret;
 203         }
 204
 205         /* we should be in buffer now (if not then size too large) */
 206         if ((dfu->i_buf + size) > dfu->i_buf_end) {
 207                 error("Buffer overflow! (0x%p + 0x%x > 0x%p)\n", dfu->i_buf,
 208                       size, dfu->i_buf_end);
 209                 return -1;
 210         }
 211
 212         memcpy(dfu->i_buf, buf, size);
 213         dfu->i_buf += size;
 214
 215         /* if end or if buffer full flush */
 216         if (size == 0 || (dfu->i_buf + size) > dfu->i_buf_end) {
 217                 tret = dfu_write_buffer_drain(dfu);
 218                 if (ret == 0)
 219                         ret = tret;
 220         }
 221
 222         return ret;
 223 }
 224
 225 static int dfu_read_buffer_fill(struct dfu_entity *dfu, void *buf, int size)
 226 {
 227         long chunk;
 228         int ret, readn;
 229
 230         readn = 0;
 231         while (size > 0) {
 232                 /* get chunk that can be read */
 233                 chunk = min(size, dfu->b_left);
 234                 /* consume */
 235                 if (chunk > 0) {
 236                         memcpy(buf, dfu->i_buf, chunk);
 237                         dfu->crc = crc32(dfu->crc, buf, chunk);
 238                         dfu->i_buf += chunk;
 239                         dfu->b_left -= chunk;
 240                         dfu->r_left -= chunk;
 241                         size -= chunk;
 242                         buf += chunk;
 243                         readn += chunk;
 244                 }
 245
 246                 /* all done */
 247                 if (size > 0) {
 248                         /* no more to read */
 249                         if (dfu->r_left == 0)
 250                                 break;
 251
 252                         dfu->i_buf = dfu->i_buf_start;
 253                         dfu->b_left = dfu->i_buf_end - dfu->i_buf_start;
 254
 255                         /* got to read, but buffer is empty */
 256                         if (dfu->b_left > dfu->r_left)
 257                                 dfu->b_left = dfu->r_left;
 258                         ret = dfu->read_medium(dfu, dfu->offset, dfu->i_buf,
 259                                         &dfu->b_left);
 260                         if (ret != 0) {
 261                                 debug("%s: Read error!\n", __func__);
 262                                 return ret;
 263                         }
 264                         dfu->offset += dfu->b_left;
 265                         dfu->r_left -= dfu->b_left;
 266
 267                         puts("#");
 268                 }
 269         }
 270
 271         return readn;
 272 }
 273
 274 int dfu_read(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 275 {
 276         int ret = 0;
 277
 278         debug("%s: name: %s buf: 0x%p size: 0x%x p_num: 0x%x i_buf: 0x%p\n",
 279                __func__, dfu->name, buf, size, blk_seq_num, dfu->i_buf);
 280
 281         if (!dfu->inited) {
 282                 dfu->i_buf_start = dfu_get_buf();
 283                 if (dfu->i_buf_start == NULL)
 284                         return -ENOMEM;
 285
 286                 ret = dfu->read_medium(dfu, 0, dfu->i_buf_start, &dfu->r_left);
 287                 if (ret != 0) {
 288                         debug("%s: failed to get r_left\n", __func__);
 289                         return ret;
 290                 }
 291
 292                 debug("%s: %s %ld [B]\n", __func__, dfu->name, dfu->r_left);
 293
 294                 dfu->i_blk_seq_num = 0;
 295                 dfu->crc = 0;
 296                 dfu->offset = 0;
 297                 dfu->i_buf_end = dfu_get_buf() + dfu_buf_size;
 298                 dfu->i_buf = dfu->i_buf_start;
 299                 dfu->b_left = min(dfu_buf_size, dfu->r_left);
 300
 301                 dfu->bad_skip = 0;
 302
 303                 dfu->inited = 1;
 304         }
 305
 306         if (dfu->i_blk_seq_num != blk_seq_num) {
 307                 printf("%s: Wrong sequence number! [%d] [%d]\n",
 308                        __func__, dfu->i_blk_seq_num, blk_seq_num);
 309                 return -1;
 310         }
 311         /* handle rollover */
 312         dfu->i_blk_seq_num = (dfu->i_blk_seq_num + 1) & 0xffff;
 313
 314         ret = dfu_read_buffer_fill(dfu, buf, size);
 315         if (ret < 0) {
 316                 printf("%s: Failed to fill buffer\n", __func__);
 317                 return -1;
 318         }
 319
 320         if (ret < size) {
 321                 debug("%s: %s CRC32: 0x%x\n", __func__, dfu->name, dfu->crc);
 322                 puts("\nUPLOAD ... done\nCtrl+C to exit ...\n");
 323
 324                 dfu_free_buf();
 325                 dfu->i_blk_seq_num = 0;
 326                 dfu->crc = 0;
 327                 dfu->offset = 0;
 328                 dfu->i_buf_start = dfu_buf;
 329                 dfu->i_buf_end = dfu_buf;
 330                 dfu->i_buf = dfu->i_buf_start;
 331                 dfu->b_left = 0;
 332
 333                 dfu->bad_skip = 0;
 334
 335                 dfu->inited = 0;
 336         }
 337
 338         return ret;
 339 }
 340
 341 static int dfu_fill_entity(struct dfu_entity *dfu, char *s, int alt,
 342                            char *interface, int num)
 343 {
 344         char *st;
 345
 346         debug("%s: %s interface: %s num: %d\n", __func__, s, interface, num);
 347         st = strsep(&s, " ");
 348         strcpy(dfu->name, st);
 349
 350         dfu->dev_num = num;
 351         dfu->alt = alt;
 352
 353         /* Specific for mmc device */
 354         if (strcmp(interface, "mmc") == 0) {
 355                 if (dfu_fill_entity_mmc(dfu, s))
 356                         return -1;
 357         } else if (strcmp(interface, "nand") == 0) {
 358                 if (dfu_fill_entity_nand(dfu, s))
 359                         return -1;
 360         } else if (strcmp(interface, "ram") == 0) {
 361                 if (dfu_fill_entity_ram(dfu, s))
 362                         return -1;
 363         } else {
 364                 printf("%s: Device %s not (yet) supported!\n",
 365                        __func__,  interface);
 366                 return -1;
 367         }
 368
 369         return 0;
 370 }
 371
 372 void dfu_free_entities(void)
 373 {
 374         struct dfu_entity *dfu, *p, *t = NULL;
 375
 376         list_for_each_entry_safe_reverse(dfu, p, &dfu_list, list) {
 377                 list_del(&dfu->list);
 378                 t = dfu;
 379         }
 380         if (t)
 381                 free(t);
 382         INIT_LIST_HEAD(&dfu_list);
 383
 384         alt_num_cnt = 0;
 385 }
 386
 387 int dfu_config_entities(char *env, char *interface, int num)
 388 {
 389         struct dfu_entity *dfu;
 390         int i, ret;
 391         char *s;
 392
 393         dfu_alt_num = dfu_find_alt_num(env);
 394         debug("%s: dfu_alt_num=%d\n", __func__, dfu_alt_num);
 395
 396         dfu = calloc(sizeof(*dfu), dfu_alt_num);
 397         if (!dfu)
 398                 return -1;
 399         for (i = 0; i < dfu_alt_num; i++) {
 400
 401                 s = strsep(&env, ";");
 402                 ret = dfu_fill_entity(&dfu[i], s, alt_num_cnt, interface, num);
 403                 if (ret)
 404                         return -1;
 405
 406                 list_add_tail(&dfu[i].list, &dfu_list);
 407                 alt_num_cnt++;
 408         }
 409
 410         return 0;
 411 }
 412
 413 const char *dfu_get_dev_type(enum dfu_device_type t)
 414 {
 415         const char *dev_t[] = {NULL, "eMMC", "OneNAND", "NAND", "RAM" };
 416         return dev_t[t];
 417 }
 418
 419 const char *dfu_get_layout(enum dfu_layout l)
 420 {
 421         const char *dfu_layout[] = {NULL, "RAW_ADDR", "FAT", "EXT2",
 422                                            "EXT3", "EXT4", "RAM_ADDR" };
 423         return dfu_layout[l];
 424 }
 425
 426 void dfu_show_entities(void)
 427 {
 428         struct dfu_entity *dfu;
 429
 430         puts("DFU alt settings list:\n");
 431
 432         list_for_each_entry(dfu, &dfu_list, list) {
 433                 printf("dev: %s alt: %d name: %s layout: %s\n",
 434                        dfu_get_dev_type(dfu->dev_type), dfu->alt,
 435                        dfu->name, dfu_get_layout(dfu->layout));
 436         }
 437 }
 438
 439 int dfu_get_alt_number(void)
 440 {
 441         return dfu_alt_num;
 442 }
 443
 444 struct dfu_entity *dfu_get_entity(int alt)
 445 {
 446         struct dfu_entity *dfu;
 447
 448         list_for_each_entry(dfu, &dfu_list, list) {
 449                 if (dfu->alt == alt)
 450                         return dfu;
 451         }
 452
 453         return NULL;
 454 }
 455
 456 int dfu_get_alt(char *name)
 457 {
 458         struct dfu_entity *dfu;
 459
 460         list_for_each_entry(dfu, &dfu_list, list) {
 461                 if (!strncmp(dfu->name, name, strlen(dfu->name)))
 462                         return dfu->alt;
 463         }
 464
 465         return -ENODEV;
 466 }