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