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 blk_desc *block_dev,
  58                                                 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(&load, 0, header);
  86         } else {
  87                 err = spl_parse_image_header(header);
  88                 if (err)
  89                         goto end;
  90
  91                 err = file_fat_read(filename, (u8 *)spl_image.load_addr, 0);
  92         }
  93
  94 end:
  95 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
  96         if (err <= 0)
  97                 printf("%s: error reading image %s, err - %d\n",
  98                        __func__, filename, err);
  99 #endif
 100
 101         return (err <= 0);
 102 }
 103
 104 #ifdef CONFIG_SPL_OS_BOOT
 105 int spl_load_image_fat_os(struct blk_desc *block_dev, int partition)
 106 {
 107         int err;
 108         __maybe_unused char *file;
 109
 110         err = spl_register_fat_device(block_dev, partition);
 111         if (err)
 112                 return err;
 113
 114 #if defined(CONFIG_SPL_ENV_SUPPORT) && defined(CONFIG_SPL_OS_BOOT)
 115         file = getenv("falcon_args_file");
 116         if (file) {
 117                 err = file_fat_read(file, (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
 118                 if (err <= 0) {
 119                         printf("spl: error reading image %s, err - %d, falling back to default\n",
 120                                file, err);
 121                         goto defaults;
 122                 }
 123                 file = getenv("falcon_image_file");
 124                 if (file) {
 125                         err = spl_load_image_fat(block_dev, partition, file);
 126                         if (err != 0) {
 127                                 puts("spl: falling back to default\n");
 128                                 goto defaults;
 129                         }
 130
 131                         return 0;
 132                 } else
 133                         puts("spl: falcon_image_file not set in environment, falling back to default\n");
 134         } else
 135                 puts("spl: falcon_args_file not set in environment, falling back to default\n");
 136
 137 defaults:
 138 #endif
 139
 140         err = file_fat_read(CONFIG_SPL_FS_LOAD_ARGS_NAME,
 141                             (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
 142         if (err <= 0) {
 143 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
 144                 printf("%s: error reading image %s, err - %d\n",
 145                        __func__, CONFIG_SPL_FS_LOAD_ARGS_NAME, err);
 146 #endif
 147                 return -1;
 148         }
 149
 150         return spl_load_image_fat(block_dev, partition,
 151                         CONFIG_SPL_FS_LOAD_KERNEL_NAME);
 152 }
 153 #else
 154 int spl_load_image_fat_os(struct blk_desc *block_dev, int partition)
 155 {
 156         return -ENOSYS;
 157 }
 158 #endif
 159 #endif