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