common/spl/spl_fat.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2014
   4  * Texas Instruments, <www.ti.com>
   5  *
   6  * Dan Murphy <dmurphy@ti.com>
   7  *
   8  * FAT Image Functions copied from spl_mmc.c
   9  */
  10
  11 #include <common.h>
  12 #include <spl.h>
  13 #include <asm/u-boot.h>
  14 #include <fat.h>
  15 #include <errno.h>
  16 #include <image.h>
  17 #include <linux/libfdt.h>
  18
  19 static int fat_registered;
  20
  21 static int spl_register_fat_device(struct blk_desc *block_dev, int partition)
  22 {
  23         int err = 0;
  24
  25         if (fat_registered)
  26                 return err;
  27
  28         err = fat_register_device(block_dev, partition);
  29         if (err) {
  30 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
  31                 printf("%s: fat register err - %d\n", __func__, err);
  32 #endif
  33                 return err;
  34         }
  35
  36         fat_registered = 1;
  37
  38         return err;
  39 }
  40
  41 static ulong spl_fit_read(struct spl_load_info *load, ulong file_offset,
  42                           ulong size, void *buf)
  43 {
  44         loff_t actread;
  45         int ret;
  46         char *filename = (char *)load->filename;
  47
  48         ret = fat_read_file(filename, buf, file_offset, size, &actread);
  49         if (ret)
  50                 return ret;
  51
  52         return actread;
  53 }
  54
  55 int spl_load_image_fat(struct spl_image_info *spl_image,
  56                        struct blk_desc *block_dev, int partition,
  57                        const char *filename)
  58 {
  59         int err;
  60         struct image_header *header;
  61
  62         err = spl_register_fat_device(block_dev, partition);
  63         if (err)
  64                 goto end;
  65
  66         header = (struct image_header *)(CONFIG_SYS_TEXT_BASE -
  67                                                 sizeof(struct image_header));
  68
  69         err = file_fat_read(filename, header, sizeof(struct image_header));
  70         if (err <= 0)
  71                 goto end;
  72
  73         if (IS_ENABLED(CONFIG_SPL_LOAD_FIT_FULL) &&
  74             image_get_magic(header) == FDT_MAGIC) {
  75                 err = file_fat_read(filename, (void *)CONFIG_SYS_LOAD_ADDR, 0);
  76                 if (err <= 0)
  77                         goto end;
  78                 err = spl_parse_image_header(spl_image,
  79                                 (struct image_header *)CONFIG_SYS_LOAD_ADDR);
  80                 if (err == -EAGAIN)
  81                         return err;
  82                 if (err == 0)
  83                         err = 1;
  84         } else if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) &&
  85             image_get_magic(header) == FDT_MAGIC) {
  86                 struct spl_load_info load;
  87
  88                 debug("Found FIT\n");
  89                 load.read = spl_fit_read;
  90                 load.bl_len = 1;
  91                 load.filename = (void *)filename;
  92                 load.priv = NULL;
  93
  94                 return spl_load_simple_fit(spl_image, &load, 0, header);
  95         } else {
  96                 err = spl_parse_image_header(spl_image, header);
  97                 if (err)
  98                         goto end;
  99
 100                 err = file_fat_read(filename,
 101                                     (u8 *)(uintptr_t)spl_image->load_addr, 0);
 102         }
 103
 104 end:
 105 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
 106         if (err <= 0)
 107                 printf("%s: error reading image %s, err - %d\n",
 108                        __func__, filename, err);
 109 #endif
 110
 111         return (err <= 0);
 112 }
 113
 114 #ifdef CONFIG_SPL_OS_BOOT
 115 int spl_load_image_fat_os(struct spl_image_info *spl_image,
 116                           struct blk_desc *block_dev, int partition)
 117 {
 118         int err;
 119         __maybe_unused char *file;
 120
 121         err = spl_register_fat_device(block_dev, partition);
 122         if (err)
 123                 return err;
 124
 125 #if defined(CONFIG_SPL_ENV_SUPPORT) && defined(CONFIG_SPL_OS_BOOT)
 126         file = env_get("falcon_args_file");
 127         if (file) {
 128                 err = file_fat_read(file, (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
 129                 if (err <= 0) {
 130                         printf("spl: error reading image %s, err - %d, falling back to default\n",
 131                                file, err);
 132                         goto defaults;
 133                 }
 134                 file = env_get("falcon_image_file");
 135                 if (file) {
 136                         err = spl_load_image_fat(spl_image, block_dev,
 137                                                  partition, file);
 138                         if (err != 0) {
 139                                 puts("spl: falling back to default\n");
 140                                 goto defaults;
 141                         }
 142
 143                         return 0;
 144                 } else
 145                         puts("spl: falcon_image_file not set in environment, falling back to default\n");
 146         } else
 147                 puts("spl: falcon_args_file not set in environment, falling back to default\n");
 148
 149 defaults:
 150 #endif
 151
 152         err = file_fat_read(CONFIG_SPL_FS_LOAD_ARGS_NAME,
 153                             (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
 154         if (err <= 0) {
 155 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
 156                 printf("%s: error reading image %s, err - %d\n",
 157                        __func__, CONFIG_SPL_FS_LOAD_ARGS_NAME, err);
 158 #endif
 159                 return -1;
 160         }
 161
 162         return spl_load_image_fat(spl_image, block_dev, partition,
 163                         CONFIG_SPL_FS_LOAD_KERNEL_NAME);
 164 }
 165 #else
 166 int spl_load_image_fat_os(struct spl_image_info *spl_image,
 167                           struct blk_desc *block_dev, int partition)
 168 {
 169         return -ENOSYS;
 170 }
 171 #endif