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
  19 static int fat_registered;
  20
  21 #ifdef CONFIG_SPL_FAT_SUPPORT
  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 int spl_load_image_fat(struct blk_desc *block_dev,
  43                                                 int partition,
  44                                                 const char *filename)
  45 {
  46         int err;
  47         struct image_header *header;
  48
  49         err = spl_register_fat_device(block_dev, partition);
  50         if (err)
  51                 goto end;
  52
  53         header = (struct image_header *)(CONFIG_SYS_TEXT_BASE -
  54                                                 sizeof(struct image_header));
  55
  56         err = file_fat_read(filename, header, sizeof(struct image_header));
  57         if (err <= 0)
  58                 goto end;
  59
  60         spl_parse_image_header(header);
  61
  62         err = file_fat_read(filename, (u8 *)spl_image.load_addr, 0);
  63
  64 end:
  65 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
  66         if (err <= 0)
  67                 printf("%s: error reading image %s, err - %d\n",
  68                        __func__, filename, err);
  69 #endif
  70
  71         return (err <= 0);
  72 }
  73
  74 #ifdef CONFIG_SPL_OS_BOOT
  75 int spl_load_image_fat_os(struct blk_desc *block_dev, int partition)
  76 {
  77         int err;
  78         __maybe_unused char *file;
  79
  80         err = spl_register_fat_device(block_dev, partition);
  81         if (err)
  82                 return err;
  83
  84 #if defined(CONFIG_SPL_ENV_SUPPORT) && defined(CONFIG_SPL_OS_BOOT)
  85         file = getenv("falcon_args_file");
  86         if (file) {
  87                 err = file_fat_read(file, (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
  88                 if (err <= 0) {
  89                         printf("spl: error reading image %s, err - %d, falling back to default\n",
  90                                file, err);
  91                         goto defaults;
  92                 }
  93                 file = getenv("falcon_image_file");
  94                 if (file) {
  95                         err = spl_load_image_fat(block_dev, partition, file);
  96                         if (err != 0) {
  97                                 puts("spl: falling back to default\n");
  98                                 goto defaults;
  99                         }
 100
 101                         return 0;
 102                 } else
 103                         puts("spl: falcon_image_file not set in environment, falling back to default\n");
 104         } else
 105                 puts("spl: falcon_args_file not set in environment, falling back to default\n");
 106
 107 defaults:
 108 #endif
 109
 110         err = file_fat_read(CONFIG_SPL_FS_LOAD_ARGS_NAME,
 111                             (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
 112         if (err <= 0) {
 113 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
 114                 printf("%s: error reading image %s, err - %d\n",
 115                        __func__, CONFIG_SPL_FS_LOAD_ARGS_NAME, err);
 116 #endif
 117                 return -1;
 118         }
 119
 120         return spl_load_image_fat(block_dev, partition,
 121                         CONFIG_SPL_FS_LOAD_KERNEL_NAME);
 122 }
 123 #else
 124 int spl_load_image_fat_os(struct blk_desc *block_dev, int partition)
 125 {
 126         return -ENOSYS;
 127 }
 128 #endif
 129 #endif