common/spl/spl_fat.c

   1 /*
   2  * (C) Copyright 2014
   3  * Texas Instruments, <www.ti.com>
   4  *
   5  * Dan Murphy <dmurphy@ti.com>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  *
   9  * FAT Image Functions copied from spl_mmc.c
  10  */
  11
  12 #include <common.h>
  13 #include <spl.h>
  14 #include <asm/u-boot.h>
  15 #include <fat.h>
  16 #include <errno.h>
  17 #include <image.h>
  18 #include <libfdt.h>
  19
  20 static int fat_registered;
  21
  22 #ifdef CONFIG_SPL_FAT_SUPPORT
  23 static int spl_register_fat_device(struct blk_desc *block_dev, int partition)
  24 {
  25         int err = 0;
  26
  27         if (fat_registered)
  28                 return err;
  29
  30         err = fat_register_device(block_dev, partition);
  31         if (err) {
  32 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
  33                 printf("%s: fat register err - %d\n", __func__, err);
  34 #endif
  35                 return err;
  36         }
  37
  38         fat_registered = 1;
  39
  40         return err;
  41 }
  42
  43 static ulong spl_fit_read(struct spl_load_info *load, ulong file_offset,
  44                           ulong size, void *buf)
  45 {
  46         loff_t actread;
  47         int ret;
  48         char *filename = (char *)load->filename;
  49
  50         ret = fat_read_file(filename, buf, file_offset, size, &actread);
  51         if (ret)
  52                 return ret;
  53
  54         return actread;
  55 }
  56
  57 int spl_load_image_fat(struct spl_image_info *spl_image,
  58                        struct blk_desc *block_dev, int partition,
  59                        const char *filename)
  60 {
  61         int err;
  62         struct image_header *header;
  63
  64         err = spl_register_fat_device(block_dev, partition);
  65         if (err)
  66                 goto end;
  67
  68         header = (struct image_header *)(CONFIG_SYS_TEXT_BASE -
  69                                                 sizeof(struct image_header));
  70
  71         err = file_fat_read(filename, header, sizeof(struct image_header));
  72         if (err <= 0)
  73                 goto end;
  74
  75         if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) &&
  76             image_get_magic(header) == FDT_MAGIC) {
  77                 struct spl_load_info load;
  78
  79                 debug("Found FIT\n");
  80                 load.read = spl_fit_read;
  81                 load.bl_len = 1;
  82                 load.filename = (void *)filename;
  83                 load.priv = NULL;
  84
  85                 return spl_load_simple_fit(spl_image, &load, 0, header);
  86         } else {
  87                 err = spl_parse_image_header(spl_image, header);
  88                 if (err)
  89                         goto end;
  90
  91                 err = file_fat_read(filename,
  92                                     (u8 *)(uintptr_t)spl_image->load_addr, 0);
  93         }
  94
  95 end:
  96 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
  97         if (err <= 0)
  98                 printf("%s: error reading image %s, err - %d\n",
  99                        __func__, filename, err);
 100 #endif
 101
 102         return (err <= 0);
 103 }
 104
 105 #ifdef CONFIG_SPL_OS_BOOT
 106 int spl_load_image_fat_os(struct spl_image_info *spl_image,
 107                           struct blk_desc *block_dev, int partition)
 108 {
 109         int err;
 110         __maybe_unused char *file;
 111
 112         err = spl_register_fat_device(block_dev, partition);
 113         if (err)
 114                 return err;
 115
 116 #if defined(CONFIG_SPL_ENV_SUPPORT) && defined(CONFIG_SPL_OS_BOOT)
 117         file = getenv("falcon_args_file");
 118         if (file) {
 119                 err = file_fat_read(file, (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
 120                 if (err <= 0) {
 121                         printf("spl: error reading image %s, err - %d, falling back to default\n",
 122                                file, err);
 123                         goto defaults;
 124                 }
 125                 file = getenv("falcon_image_file");
 126                 if (file) {
 127                         err = spl_load_image_fat(spl_image, block_dev,
 128                                                  partition, file);
 129                         if (err != 0) {
 130                                 puts("spl: falling back to default\n");
 131                                 goto defaults;
 132                         }
 133
 134                         return 0;
 135                 } else
 136                         puts("spl: falcon_image_file not set in environment, falling back to default\n");
 137         } else
 138                 puts("spl: falcon_args_file not set in environment, falling back to default\n");
 139
 140 defaults:
 141 #endif
 142
 143         err = file_fat_read(CONFIG_SPL_FS_LOAD_ARGS_NAME,
 144                             (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
 145         if (err <= 0) {
 146 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
 147                 printf("%s: error reading image %s, err - %d\n",
 148                        __func__, CONFIG_SPL_FS_LOAD_ARGS_NAME, err);
 149 #endif
 150                 return -1;
 151         }
 152
 153         return spl_load_image_fat(spl_image, block_dev, partition,
 154                         CONFIG_SPL_FS_LOAD_KERNEL_NAME);
 155 }
 156 #else
 157 int spl_load_image_fat_os(struct spl_image_info *spl_image,
 158                           struct blk_desc *block_dev, int partition)
 159 {
 160         return -ENOSYS;
 161 }
 162 #endif
 163 #endif