xref: /openbmc/u-boot/common/spl/spl_fat.c (revision 8c30b571)
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 	spl_parse_image_header(header);
61 
62 	err = file_fat_read(filename, (u8 *)spl_image.load_addr, 0);
63 
64 end:
65 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
66 	if (err <= 0)
67 		printf("%s: error reading image %s, err - %d\n",
68 		       __func__, filename, err);
69 #endif
70 
71 	return (err <= 0);
72 }
73 
74 #ifdef CONFIG_SPL_OS_BOOT
75 int spl_load_image_fat_os(struct blk_desc *block_dev, int partition)
76 {
77 	int err;
78 	__maybe_unused char *file;
79 
80 	err = spl_register_fat_device(block_dev, partition);
81 	if (err)
82 		return err;
83 
84 #if defined(CONFIG_SPL_ENV_SUPPORT) && defined(CONFIG_SPL_OS_BOOT)
85 	file = getenv("falcon_args_file");
86 	if (file) {
87 		err = file_fat_read(file, (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
88 		if (err <= 0) {
89 			printf("spl: error reading image %s, err - %d, falling back to default\n",
90 			       file, err);
91 			goto defaults;
92 		}
93 		file = getenv("falcon_image_file");
94 		if (file) {
95 			err = spl_load_image_fat(block_dev, partition, file);
96 			if (err != 0) {
97 				puts("spl: falling back to default\n");
98 				goto defaults;
99 			}
100 
101 			return 0;
102 		} else
103 			puts("spl: falcon_image_file not set in environment, falling back to default\n");
104 	} else
105 		puts("spl: falcon_args_file not set in environment, falling back to default\n");
106 
107 defaults:
108 #endif
109 
110 	err = file_fat_read(CONFIG_SPL_FS_LOAD_ARGS_NAME,
111 			    (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
112 	if (err <= 0) {
113 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
114 		printf("%s: error reading image %s, err - %d\n",
115 		       __func__, CONFIG_SPL_FS_LOAD_ARGS_NAME, err);
116 #endif
117 		return -1;
118 	}
119 
120 	return spl_load_image_fat(block_dev, partition,
121 			CONFIG_SPL_FS_LOAD_KERNEL_NAME);
122 }
123 #else
124 int spl_load_image_fat_os(struct blk_desc *block_dev, int partition)
125 {
126 	return -ENOSYS;
127 }
128 #endif
129 #endif
130