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 static int spl_register_fat_device(struct blk_desc *block_dev, int partition)
  23 {
  24         int err = 0;
  25
  26         if (fat_registered)
  27                 return err;
  28
  29         err = fat_register_device(block_dev, partition);
  30         if (err) {
  31 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
  32                 printf("%s: fat register err - %d\n", __func__, err);
  33 #endif
  34                 return err;
  35         }
  36
  37         fat_registered = 1;
  38
  39         return err;
  40 }
  41
  42 static ulong spl_fit_read(struct spl_load_info *load, ulong file_offset,
  43                           ulong size, void *buf)
  44 {
  45         loff_t actread;
  46         int ret;
  47         char *filename = (char *)load->filename;
  48
  49         ret = fat_read_file(filename, buf, file_offset, size, &actread);
  50         if (ret)
  51                 return ret;
  52
  53         return actread;
  54 }
  55
  56 int spl_load_image_fat(struct spl_image_info *spl_image,
  57                        struct blk_desc *block_dev, int partition,
  58                        const char *filename)
  59 {
  60         int err;
  61         struct image_header *header;
  62
  63         err = spl_register_fat_device(block_dev, partition);
  64         if (err)
  65                 goto end;
  66
  67         header = (struct image_header *)(CONFIG_SYS_TEXT_BASE -
  68                                                 sizeof(struct image_header));
  69
  70         err = file_fat_read(filename, header, sizeof(struct image_header));
  71         if (err <= 0)
  72                 goto end;
  73
  74         if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) &&
  75             image_get_magic(header) == FDT_MAGIC) {
  76                 struct spl_load_info load;
  77
  78                 debug("Found FIT\n");
  79                 load.read = spl_fit_read;
  80                 load.bl_len = 1;
  81                 load.filename = (void *)filename;
  82                 load.priv = NULL;
  83
  84                 return spl_load_simple_fit(spl_image, &load, 0, header);
  85         } else {
  86                 err = spl_parse_image_header(spl_image, header);
  87                 if (err)
  88                         goto end;
  89
  90                 err = file_fat_read(filename,
  91                                     (u8 *)(uintptr_t)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 spl_image_info *spl_image,
 106                           struct blk_desc *block_dev, int partition)
 107 {
 108         int err;
 109         __maybe_unused char *file;
 110
 111         err = spl_register_fat_device(block_dev, partition);
 112         if (err)
 113                 return err;
 114
 115 #if defined(CONFIG_SPL_ENV_SUPPORT) && defined(CONFIG_SPL_OS_BOOT)
 116         file = env_get("falcon_args_file");
 117         if (file) {
 118                 err = file_fat_read(file, (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
 119                 if (err <= 0) {
 120                         printf("spl: error reading image %s, err - %d, falling back to default\n",
 121                                file, err);
 122                         goto defaults;
 123                 }
 124                 file = env_get("falcon_image_file");
 125                 if (file) {
 126                         err = spl_load_image_fat(spl_image, block_dev,
 127                                                  partition, file);
 128                         if (err != 0) {
 129                                 puts("spl: falling back to default\n");
 130                                 goto defaults;
 131                         }
 132
 133                         return 0;
 134                 } else
 135                         puts("spl: falcon_image_file not set in environment, falling back to default\n");
 136         } else
 137                 puts("spl: falcon_args_file not set in environment, falling back to default\n");
 138
 139 defaults:
 140 #endif
 141
 142         err = file_fat_read(CONFIG_SPL_FS_LOAD_ARGS_NAME,
 143                             (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
 144         if (err <= 0) {
 145 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
 146                 printf("%s: error reading image %s, err - %d\n",
 147                        __func__, CONFIG_SPL_FS_LOAD_ARGS_NAME, err);
 148 #endif
 149                 return -1;
 150         }
 151
 152         return spl_load_image_fat(spl_image, block_dev, partition,
 153                         CONFIG_SPL_FS_LOAD_KERNEL_NAME);
 154 }
 155 #else
 156 int spl_load_image_fat_os(struct spl_image_info *spl_image,
 157                           struct blk_desc *block_dev, int partition)
 158 {
 159         return -ENOSYS;
 160 }
 161 #endif