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 = spl_get_load_buffer(-sizeof(*header), sizeof(*header));
  67
  68         err = file_fat_read(filename, header, sizeof(struct image_header));
  69         if (err <= 0)
  70                 goto end;
  71
  72         if (IS_ENABLED(CONFIG_SPL_LOAD_FIT_FULL) &&
  73             image_get_magic(header) == FDT_MAGIC) {
  74                 err = file_fat_read(filename, (void *)CONFIG_SYS_LOAD_ADDR, 0);
  75                 if (err <= 0)
  76                         goto end;
  77                 err = spl_parse_image_header(spl_image,
  78                                 (struct image_header *)CONFIG_SYS_LOAD_ADDR);
  79                 if (err == -EAGAIN)
  80                         return err;
  81                 if (err == 0)
  82                         err = 1;
  83         } else if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) &&
  84             image_get_magic(header) == FDT_MAGIC) {
  85                 struct spl_load_info load;
  86
  87                 debug("Found FIT\n");
  88                 load.read = spl_fit_read;
  89                 load.bl_len = 1;
  90                 load.filename = (void *)filename;
  91                 load.priv = NULL;
  92
  93                 return spl_load_simple_fit(spl_image, &load, 0, header);
  94         } else {
  95                 err = spl_parse_image_header(spl_image, header);
  96                 if (err)
  97                         goto end;
  98
  99                 err = file_fat_read(filename,
 100                                     (u8 *)(uintptr_t)spl_image->load_addr, 0);
 101         }
 102
 103 end:
 104 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
 105         if (err <= 0)
 106                 printf("%s: error reading image %s, err - %d\n",
 107                        __func__, filename, err);
 108 #endif
 109
 110         return (err <= 0);
 111 }
 112
 113 #ifdef CONFIG_SPL_OS_BOOT
 114 int spl_load_image_fat_os(struct spl_image_info *spl_image,
 115                           struct blk_desc *block_dev, int partition)
 116 {
 117         int err;
 118         __maybe_unused char *file;
 119
 120         err = spl_register_fat_device(block_dev, partition);
 121         if (err)
 122                 return err;
 123
 124 #if defined(CONFIG_SPL_ENV_SUPPORT) && defined(CONFIG_SPL_OS_BOOT)
 125         file = env_get("falcon_args_file");
 126         if (file) {
 127                 err = file_fat_read(file, (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
 128                 if (err <= 0) {
 129                         printf("spl: error reading image %s, err - %d, falling back to default\n",
 130                                file, err);
 131                         goto defaults;
 132                 }
 133                 file = env_get("falcon_image_file");
 134                 if (file) {
 135                         err = spl_load_image_fat(spl_image, block_dev,
 136                                                  partition, file);
 137                         if (err != 0) {
 138                                 puts("spl: falling back to default\n");
 139                                 goto defaults;
 140                         }
 141
 142                         return 0;
 143                 } else
 144                         puts("spl: falcon_image_file not set in environment, falling back to default\n");
 145         } else
 146                 puts("spl: falcon_args_file not set in environment, falling back to default\n");
 147
 148 defaults:
 149 #endif
 150
 151         err = file_fat_read(CONFIG_SPL_FS_LOAD_ARGS_NAME,
 152                             (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
 153         if (err <= 0) {
 154 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
 155                 printf("%s: error reading image %s, err - %d\n",
 156                        __func__, CONFIG_SPL_FS_LOAD_ARGS_NAME, err);
 157 #endif
 158                 return -1;
 159         }
 160
 161         return spl_load_image_fat(spl_image, block_dev, partition,
 162                         CONFIG_SPL_FS_LOAD_KERNEL_NAME);
 163 }
 164 #else
 165 int spl_load_image_fat_os(struct spl_image_info *spl_image,
 166                           struct blk_desc *block_dev, int partition)
 167 {
 168         return -ENOSYS;
 169 }
 170 #endif