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