drivers/dfu/dfu_mmc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * dfu.c -- DFU back-end routines
   4  *
   5  * Copyright (C) 2012 Samsung Electronics
   6  * author: Lukasz Majewski <l.majewski@samsung.com>
   7  */
   8
   9 #include <common.h>
  10 #include <malloc.h>
  11 #include <errno.h>
  12 #include <div64.h>
  13 #include <dfu.h>
  14 #include <ext4fs.h>
  15 #include <fat.h>
  16 #include <mmc.h>
  17
  18 static unsigned char *dfu_file_buf;
  19 static u64 dfu_file_buf_len;
  20 static long dfu_file_buf_filled;
  21
  22 static int mmc_block_op(enum dfu_op op, struct dfu_entity *dfu,
  23                         u64 offset, void *buf, long *len)
  24 {
  25         struct mmc *mmc;
  26         u32 blk_start, blk_count, n = 0;
  27         int ret, part_num_bkp = 0;
  28
  29         mmc = find_mmc_device(dfu->data.mmc.dev_num);
  30         if (!mmc) {
  31                 pr_err("Device MMC %d - not found!", dfu->data.mmc.dev_num);
  32                 return -ENODEV;
  33         }
  34
  35         /*
  36          * We must ensure that we work in lba_blk_size chunks, so ALIGN
  37          * this value.
  38          */
  39         *len = ALIGN(*len, dfu->data.mmc.lba_blk_size);
  40
  41         blk_start = dfu->data.mmc.lba_start +
  42                         (u32)lldiv(offset, dfu->data.mmc.lba_blk_size);
  43         blk_count = *len / dfu->data.mmc.lba_blk_size;
  44         if (blk_start + blk_count >
  45                         dfu->data.mmc.lba_start + dfu->data.mmc.lba_size) {
  46                 puts("Request would exceed designated area!\n");
  47                 return -EINVAL;
  48         }
  49
  50         if (dfu->data.mmc.hw_partition >= 0) {
  51                 part_num_bkp = mmc_get_blk_desc(mmc)->hwpart;
  52                 ret = blk_select_hwpart_devnum(IF_TYPE_MMC,
  53                                                dfu->data.mmc.dev_num,
  54                                                dfu->data.mmc.hw_partition);
  55                 if (ret)
  56                         return ret;
  57         }
  58
  59         debug("%s: %s dev: %d start: %d cnt: %d buf: 0x%p\n", __func__,
  60               op == DFU_OP_READ ? "MMC READ" : "MMC WRITE",
  61               dfu->data.mmc.dev_num, blk_start, blk_count, buf);
  62         switch (op) {
  63         case DFU_OP_READ:
  64                 n = blk_dread(mmc_get_blk_desc(mmc), blk_start, blk_count, buf);
  65                 break;
  66         case DFU_OP_WRITE:
  67                 n = blk_dwrite(mmc_get_blk_desc(mmc), blk_start, blk_count,
  68                                buf);
  69                 break;
  70         default:
  71                 pr_err("Operation not supported\n");
  72         }
  73
  74         if (n != blk_count) {
  75                 pr_err("MMC operation failed");
  76                 if (dfu->data.mmc.hw_partition >= 0)
  77                         blk_select_hwpart_devnum(IF_TYPE_MMC,
  78                                                  dfu->data.mmc.dev_num,
  79                                                  part_num_bkp);
  80                 return -EIO;
  81         }
  82
  83         if (dfu->data.mmc.hw_partition >= 0) {
  84                 ret = blk_select_hwpart_devnum(IF_TYPE_MMC,
  85                                                dfu->data.mmc.dev_num,
  86                                                part_num_bkp);
  87                 if (ret)
  88                         return ret;
  89         }
  90
  91         return 0;
  92 }
  93
  94 static int mmc_file_buffer(struct dfu_entity *dfu, void *buf, long *len)
  95 {
  96         if (dfu_file_buf_len + *len > CONFIG_SYS_DFU_MAX_FILE_SIZE) {
  97                 dfu_file_buf_len = 0;
  98                 return -EINVAL;
  99         }
 100
 101         /* Add to the current buffer. */
 102         memcpy(dfu_file_buf + dfu_file_buf_len, buf, *len);
 103         dfu_file_buf_len += *len;
 104
 105         return 0;
 106 }
 107
 108 static int mmc_file_op(enum dfu_op op, struct dfu_entity *dfu,
 109                         void *buf, u64 *len)
 110 {
 111         char dev_part_str[8];
 112         int ret;
 113         int fstype;
 114         loff_t size = 0;
 115
 116         switch (dfu->layout) {
 117         case DFU_FS_FAT:
 118                 fstype = FS_TYPE_FAT;
 119                 break;
 120         case DFU_FS_EXT4:
 121                 fstype = FS_TYPE_EXT;
 122                 break;
 123         default:
 124                 printf("%s: Layout (%s) not (yet) supported!\n", __func__,
 125                        dfu_get_layout(dfu->layout));
 126                 return -1;
 127         }
 128
 129         snprintf(dev_part_str, sizeof(dev_part_str), "%d:%d",
 130                  dfu->data.mmc.dev, dfu->data.mmc.part);
 131
 132         ret = fs_set_blk_dev("mmc", dev_part_str, fstype);
 133         if (ret) {
 134                 puts("dfu: fs_set_blk_dev error!\n");
 135                 return ret;
 136         }
 137
 138         switch (op) {
 139         case DFU_OP_READ:
 140                 ret = fs_read(dfu->name, (size_t)buf, 0, 0, &size);
 141                 if (ret) {
 142                         puts("dfu: fs_read error!\n");
 143                         return ret;
 144                 }
 145                 *len = size;
 146                 break;
 147         case DFU_OP_WRITE:
 148                 ret = fs_write(dfu->name, (size_t)buf, 0, *len, &size);
 149                 if (ret) {
 150                         puts("dfu: fs_write error!\n");
 151                         return ret;
 152                 }
 153                 break;
 154         case DFU_OP_SIZE:
 155                 ret = fs_size(dfu->name, &size);
 156                 if (ret) {
 157                         puts("dfu: fs_size error!\n");
 158                         return ret;
 159                 }
 160                 *len = size;
 161                 break;
 162         default:
 163                 return -1;
 164         }
 165
 166         return ret;
 167 }
 168
 169 int dfu_write_medium_mmc(struct dfu_entity *dfu,
 170                 u64 offset, void *buf, long *len)
 171 {
 172         int ret = -1;
 173
 174         switch (dfu->layout) {
 175         case DFU_RAW_ADDR:
 176                 ret = mmc_block_op(DFU_OP_WRITE, dfu, offset, buf, len);
 177                 break;
 178         case DFU_FS_FAT:
 179         case DFU_FS_EXT4:
 180                 ret = mmc_file_buffer(dfu, buf, len);
 181                 break;
 182         default:
 183                 printf("%s: Layout (%s) not (yet) supported!\n", __func__,
 184                        dfu_get_layout(dfu->layout));
 185         }
 186
 187         return ret;
 188 }
 189
 190 int dfu_flush_medium_mmc(struct dfu_entity *dfu)
 191 {
 192         int ret = 0;
 193
 194         if (dfu->layout != DFU_RAW_ADDR) {
 195                 /* Do stuff here. */
 196                 ret = mmc_file_op(DFU_OP_WRITE, dfu, dfu_file_buf,
 197                                 &dfu_file_buf_len);
 198
 199                 /* Now that we're done */
 200                 dfu_file_buf_len = 0;
 201         }
 202
 203         return ret;
 204 }
 205
 206 int dfu_get_medium_size_mmc(struct dfu_entity *dfu, u64 *size)
 207 {
 208         int ret;
 209
 210         switch (dfu->layout) {
 211         case DFU_RAW_ADDR:
 212                 *size = dfu->data.mmc.lba_size * dfu->data.mmc.lba_blk_size;
 213                 return 0;
 214         case DFU_FS_FAT:
 215         case DFU_FS_EXT4:
 216                 dfu_file_buf_filled = -1;
 217                 ret = mmc_file_op(DFU_OP_SIZE, dfu, NULL, size);
 218                 if (ret < 0)
 219                         return ret;
 220                 if (*size > CONFIG_SYS_DFU_MAX_FILE_SIZE)
 221                         return -1;
 222                 return 0;
 223         default:
 224                 printf("%s: Layout (%s) not (yet) supported!\n", __func__,
 225                        dfu_get_layout(dfu->layout));
 226                 return -1;
 227         }
 228 }
 229
 230 static int mmc_file_unbuffer(struct dfu_entity *dfu, u64 offset, void *buf,
 231                              long *len)
 232 {
 233         int ret;
 234         u64 file_len;
 235
 236         if (dfu_file_buf_filled == -1) {
 237                 ret = mmc_file_op(DFU_OP_READ, dfu, dfu_file_buf, &file_len);
 238                 if (ret < 0)
 239                         return ret;
 240                 dfu_file_buf_filled = file_len;
 241         }
 242         if (offset + *len > dfu_file_buf_filled)
 243                 return -EINVAL;
 244
 245         /* Add to the current buffer. */
 246         memcpy(buf, dfu_file_buf + offset, *len);
 247
 248         return 0;
 249 }
 250
 251 int dfu_read_medium_mmc(struct dfu_entity *dfu, u64 offset, void *buf,
 252                 long *len)
 253 {
 254         int ret = -1;
 255
 256         switch (dfu->layout) {
 257         case DFU_RAW_ADDR:
 258                 ret = mmc_block_op(DFU_OP_READ, dfu, offset, buf, len);
 259                 break;
 260         case DFU_FS_FAT:
 261         case DFU_FS_EXT4:
 262                 ret = mmc_file_unbuffer(dfu, offset, buf, len);
 263                 break;
 264         default:
 265                 printf("%s: Layout (%s) not (yet) supported!\n", __func__,
 266                        dfu_get_layout(dfu->layout));
 267         }
 268
 269         return ret;
 270 }
 271
 272 void dfu_free_entity_mmc(struct dfu_entity *dfu)
 273 {
 274         if (dfu_file_buf) {
 275                 free(dfu_file_buf);
 276                 dfu_file_buf = NULL;
 277         }
 278 }
 279
 280 /*
 281  * @param s Parameter string containing space-separated arguments:
 282  *      1st:
 283  *              raw     (raw read/write)
 284  *              fat     (files)
 285  *              ext4    (^)
 286  *              part    (partition image)
 287  *      2nd and 3rd:
 288  *              lba_start and lba_size, for raw write
 289  *              mmc_dev and mmc_part, for filesystems and part
 290  *      4th (optional):
 291  *              mmcpart <num> (access to HW eMMC partitions)
 292  */
 293 int dfu_fill_entity_mmc(struct dfu_entity *dfu, char *devstr, char *s)
 294 {
 295         const char *entity_type;
 296         size_t second_arg;
 297         size_t third_arg;
 298
 299         struct mmc *mmc;
 300
 301         const char *argv[3];
 302         const char **parg = argv;
 303
 304         dfu->data.mmc.dev_num = simple_strtoul(devstr, NULL, 10);
 305
 306         for (; parg < argv + sizeof(argv) / sizeof(*argv); ++parg) {
 307                 *parg = strsep(&s, " ");
 308                 if (*parg == NULL) {
 309                         pr_err("Invalid number of arguments.\n");
 310                         return -ENODEV;
 311                 }
 312         }
 313
 314         entity_type = argv[0];
 315         /*
 316          * Base 0 means we'll accept (prefixed with 0x or 0) base 16, 8,
 317          * with default 10.
 318          */
 319         second_arg = simple_strtoul(argv[1], NULL, 0);
 320         third_arg = simple_strtoul(argv[2], NULL, 0);
 321
 322         mmc = find_mmc_device(dfu->data.mmc.dev_num);
 323         if (mmc == NULL) {
 324                 pr_err("Couldn't find MMC device no. %d.\n",
 325                       dfu->data.mmc.dev_num);
 326                 return -ENODEV;
 327         }
 328
 329         if (mmc_init(mmc)) {
 330                 pr_err("Couldn't init MMC device.\n");
 331                 return -ENODEV;
 332         }
 333
 334         dfu->data.mmc.hw_partition = -EINVAL;
 335         if (!strcmp(entity_type, "raw")) {
 336                 dfu->layout                     = DFU_RAW_ADDR;
 337                 dfu->data.mmc.lba_start         = second_arg;
 338                 dfu->data.mmc.lba_size          = third_arg;
 339                 dfu->data.mmc.lba_blk_size      = mmc->read_bl_len;
 340
 341                 /*
 342                  * Check for an extra entry at dfu_alt_info env variable
 343                  * specifying the mmc HW defined partition number
 344                  */
 345                 if (s)
 346                         if (!strcmp(strsep(&s, " "), "mmcpart"))
 347                                 dfu->data.mmc.hw_partition =
 348                                         simple_strtoul(s, NULL, 0);
 349
 350         } else if (!strcmp(entity_type, "part")) {
 351                 disk_partition_t partinfo;
 352                 struct blk_desc *blk_dev = mmc_get_blk_desc(mmc);
 353                 int mmcdev = second_arg;
 354                 int mmcpart = third_arg;
 355                 int offset = 0;
 356
 357                 if (part_get_info(blk_dev, mmcpart, &partinfo) != 0) {
 358                         pr_err("Couldn't find part #%d on mmc device #%d\n",
 359                               mmcpart, mmcdev);
 360                         return -ENODEV;
 361                 }
 362
 363                 /*
 364                  * Check for an extra entry at dfu_alt_info env variable
 365                  * specifying the mmc HW defined partition number
 366                  */
 367                 if (s)
 368                         if (!strcmp(strsep(&s, " "), "offset"))
 369                                 offset = simple_strtoul(s, NULL, 0);
 370
 371                 dfu->layout                     = DFU_RAW_ADDR;
 372                 dfu->data.mmc.lba_start         = partinfo.start + offset;
 373                 dfu->data.mmc.lba_size          = partinfo.size-offset;
 374                 dfu->data.mmc.lba_blk_size      = partinfo.blksz;
 375         } else if (!strcmp(entity_type, "fat")) {
 376                 dfu->layout = DFU_FS_FAT;
 377         } else if (!strcmp(entity_type, "ext4")) {
 378                 dfu->layout = DFU_FS_EXT4;
 379         } else {
 380                 pr_err("Memory layout (%s) not supported!\n", entity_type);
 381                 return -ENODEV;
 382         }
 383
 384         /* if it's NOT a raw write */
 385         if (strcmp(entity_type, "raw")) {
 386                 dfu->data.mmc.dev = second_arg;
 387                 dfu->data.mmc.part = third_arg;
 388         }
 389
 390         dfu->dev_type = DFU_DEV_MMC;
 391         dfu->get_medium_size = dfu_get_medium_size_mmc;
 392         dfu->read_medium = dfu_read_medium_mmc;
 393         dfu->write_medium = dfu_write_medium_mmc;
 394         dfu->flush_medium = dfu_flush_medium_mmc;
 395         dfu->inited = 0;
 396         dfu->free_entity = dfu_free_entity_mmc;
 397
 398         /* Check if file buffer is ready */
 399         if (!dfu_file_buf) {
 400                 dfu_file_buf = memalign(CONFIG_SYS_CACHELINE_SIZE,
 401                                         CONFIG_SYS_DFU_MAX_FILE_SIZE);
 402                 if (!dfu_file_buf) {
 403                         pr_err("Could not memalign 0x%x bytes",
 404                               CONFIG_SYS_DFU_MAX_FILE_SIZE);
 405                         return -ENOMEM;
 406                 }
 407         }
 408
 409         return 0;
 410 }