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