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 spl_boot_device *bootdev,
  59                        struct blk_desc *block_dev, int partition,
  60                        const char *filename)
  61 {
  62         int err;
  63         struct legacy_img_hdr *header;
  64
  65         err = spl_register_fat_device(block_dev, partition);
  66         if (err)
  67                 goto end;
  68
  69         header = spl_get_load_buffer(-sizeof(*header), sizeof(*header));
  70
  71         err = file_fat_read(filename, header, sizeof(struct legacy_img_hdr));
  72         if (err <= 0)
  73                 goto end;
  74
  75         if (IS_ENABLED(CONFIG_SPL_LOAD_FIT_FULL) &&
  76             image_get_magic(header) == FDT_MAGIC) {
  77                 err = file_fat_read(filename, (void *)CONFIG_SYS_LOAD_ADDR, 0);
  78                 if (err <= 0)
  79                         goto end;
  80                 err = spl_parse_image_header(spl_image, bootdev,
  81                                 (struct legacy_img_hdr *)CONFIG_SYS_LOAD_ADDR);
  82                 if (err == -EAGAIN)
  83                         return err;
  84                 if (err == 0)
  85                         err = 1;
  86         } else if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) &&
  87             image_get_magic(header) == FDT_MAGIC) {
  88                 struct spl_load_info load;
  89
  90                 debug("Found FIT\n");
  91                 load.read = spl_fit_read;
  92                 load.bl_len = 1;
  93                 load.filename = (void *)filename;
  94                 load.priv = NULL;
  95
  96                 return spl_load_simple_fit(spl_image, &load, 0, header);
  97         } else {
  98                 err = spl_parse_image_header(spl_image, bootdev, header);
  99                 if (err)
 100                         goto end;
 101
 102                 err = file_fat_read(filename,
 103                                     (u8 *)(uintptr_t)spl_image->load_addr, 0);
 104         }
 105
 106 end:
 107 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
 108         if (err <= 0)
 109                 printf("%s: error reading image %s, err - %d\n",
 110                        __func__, filename, err);
 111 #endif
 112
 113         return (err <= 0);
 114 }
 115
 116 #if CONFIG_IS_ENABLED(OS_BOOT)
 117 int spl_load_image_fat_os(struct spl_image_info *spl_image,
 118                           struct spl_boot_device *bootdev,
 119                           struct blk_desc *block_dev, int partition)
 120 {
 121         int err;
 122         __maybe_unused char *file;
 123
 124         err = spl_register_fat_device(block_dev, partition);
 125         if (err)
 126                 return err;
 127
 128 #if defined(CONFIG_SPL_ENV_SUPPORT) && defined(CONFIG_SPL_OS_BOOT)
 129         file = env_get("falcon_args_file");
 130         if (file) {
 131                 err = file_fat_read(file, (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
 132                 if (err <= 0) {
 133                         printf("spl: error reading image %s, err - %d, falling back to default\n",
 134                                file, err);
 135                         goto defaults;
 136                 }
 137                 file = env_get("falcon_image_file");
 138                 if (file) {
 139                         err = spl_load_image_fat(spl_image, bootdev, block_dev,
 140                                                  partition, file);
 141                         if (err != 0) {
 142                                 puts("spl: falling back to default\n");
 143                                 goto defaults;
 144                         }
 145
 146                         return 0;
 147                 } else
 148                         puts("spl: falcon_image_file not set in environment, falling back to default\n");
 149         } else
 150                 puts("spl: falcon_args_file not set in environment, falling back to default\n");
 151
 152 defaults:
 153 #endif
 154
 155         err = file_fat_read(CONFIG_SPL_FS_LOAD_ARGS_NAME,
 156                             (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
 157         if (err <= 0) {
 158 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
 159                 printf("%s: error reading image %s, err - %d\n",
 160                        __func__, CONFIG_SPL_FS_LOAD_ARGS_NAME, err);
 161 #endif
 162                 return -1;
 163         }
 164
 165         return spl_load_image_fat(spl_image, bootdev, block_dev, partition,
 166                         CONFIG_SPL_FS_LOAD_KERNEL_NAME);
 167 }
 168 #else
 169 int spl_load_image_fat_os(struct spl_image_info *spl_image,
 170                           struct spl_boot_device *bootdev,
 171                           struct blk_desc *block_dev, int partition)
 172 {
 173         return -ENOSYS;
 174 }
 175 #endif