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"Das U-Boot" Source Tree
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * (c) Copyright 2011 by Tigris Elektronik GmbH
4 *
5 * Author:
6 * Maximilian Schwerin <mvs@tigris.de>
7 */
8
9#include <command.h>
10#include <env.h>
11#include <env_internal.h>
12#include <part.h>
13#include <malloc.h>
14#include <memalign.h>
15#include <search.h>
16#include <errno.h>
17#include <fat.h>
18#include <mmc.h>
19#include <scsi.h>
20#include <virtio.h>
21#include <asm/cache.h>
22#include <asm/global_data.h>
23#include <linux/stddef.h>
24
25#ifdef CONFIG_XPL_BUILD
26/* TODO(sjg@chromium.org): Figure out why this is needed */
27# if !defined(CONFIG_TARGET_AM335X_EVM) || defined(CONFIG_SPL_OS_BOOT)
28# define LOADENV
29# endif
30#else
31# define LOADENV
32#endif
33
34DECLARE_GLOBAL_DATA_PTR;
35
36__weak const char *env_fat_get_intf(void)
37{
38 return (const char *)CONFIG_ENV_FAT_INTERFACE;
39}
40
41__weak char *env_fat_get_dev_part(void)
42{
43#ifdef CONFIG_MMC
44 /* reserve one more char for the manipulation below */
45 static char part_str[] = CONFIG_ENV_FAT_DEVICE_AND_PART "\0";
46
47 if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "mmc") && part_str[0] == ':') {
48 part_str[0] = '0' + mmc_get_env_dev();
49 strcpy(&part_str[1], CONFIG_ENV_FAT_DEVICE_AND_PART);
50 }
51
52 return part_str;
53#else
54 return CONFIG_ENV_FAT_DEVICE_AND_PART;
55#endif
56}
57
58static int env_fat_save(void)
59{
60 env_t __aligned(ARCH_DMA_MINALIGN) env_new;
61 struct blk_desc *dev_desc = NULL;
62 struct disk_partition info;
63 const char *file = CONFIG_ENV_FAT_FILE;
64 int dev, part;
65 int err;
66 loff_t size;
67 const char *ifname = env_fat_get_intf();
68 const char *dev_and_part = env_fat_get_dev_part();
69
70 err = env_export(&env_new);
71 if (err)
72 return err;
73
74 part = blk_get_device_part_str(ifname, dev_and_part,
75 &dev_desc, &info, 1);
76 if (part < 0)
77 return 1;
78
79 dev = dev_desc->devnum;
80 if (fat_set_blk_dev(dev_desc, &info) != 0) {
81 /*
82 * This printf is embedded in the messages from env_save that
83 * will calling it. The missing \n is intentional.
84 */
85 printf("Unable to use %s %d:%d...\n", ifname, dev, part);
86 return 1;
87 }
88
89#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
90 if (gd->env_valid == ENV_VALID)
91 file = CONFIG_ENV_FAT_FILE_REDUND;
92#endif
93
94 err = file_fat_write(file, (void *)&env_new, 0, sizeof(env_t), &size);
95 if (err == -1) {
96 /*
97 * This printf is embedded in the messages from env_save that
98 * will calling it. The missing \n is intentional.
99 */
100 printf("Unable to write \"%s\" from %s%d:%d...\n", file, ifname, dev, part);
101 return 1;
102 }
103
104#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
105 gd->env_valid = (gd->env_valid == ENV_REDUND) ? ENV_VALID : ENV_REDUND;
106#endif
107
108 return 0;
109}
110
111#ifdef LOADENV
112static int env_fat_load(void)
113{
114 ALLOC_CACHE_ALIGN_BUFFER(char, buf1, CONFIG_ENV_SIZE);
115#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
116 ALLOC_CACHE_ALIGN_BUFFER(char, buf2, CONFIG_ENV_SIZE);
117 int err2;
118#endif
119 struct blk_desc *dev_desc = NULL;
120 struct disk_partition info;
121 int dev, part;
122 int err1;
123 const char *ifname = env_fat_get_intf();
124 const char *dev_and_part = env_fat_get_dev_part();
125
126#ifdef CONFIG_MMC
127 if (!strcmp(ifname, "mmc"))
128 mmc_initialize(NULL);
129#endif
130#ifndef CONFIG_XPL_BUILD
131#if defined(CONFIG_AHCI) || defined(CONFIG_SCSI)
132 if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "scsi"))
133 scsi_scan(true);
134#endif
135#if defined(CONFIG_VIRTIO)
136 if (!strcmp(ifname, "virtio"))
137 virtio_init();
138#endif
139#endif
140 part = blk_get_device_part_str(ifname, dev_and_part,
141 &dev_desc, &info, 1);
142 if (part < 0)
143 goto err_env_relocate;
144
145 dev = dev_desc->devnum;
146 if (fat_set_blk_dev(dev_desc, &info) != 0) {
147 /*
148 * This printf is embedded in the messages from env_save that
149 * will calling it. The missing \n is intentional.
150 */
151 printf("Unable to use %s %d:%d...\n", ifname, dev, part);
152 goto err_env_relocate;
153 }
154
155 err1 = file_fat_read(CONFIG_ENV_FAT_FILE, buf1, CONFIG_ENV_SIZE);
156#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
157 err2 = file_fat_read(CONFIG_ENV_FAT_FILE_REDUND, buf2, CONFIG_ENV_SIZE);
158
159 err1 = (err1 >= 0) ? 0 : -1;
160 err2 = (err2 >= 0) ? 0 : -1;
161 return env_import_redund(buf1, err1, buf2, err2, H_EXTERNAL);
162#else
163 if (err1 < 0) {
164 /*
165 * This printf is embedded in the messages from env_save that
166 * will calling it. The missing \n is intentional.
167 */
168 printf("Unable to read \"%s\" from %s%d:%d... \n",
169 CONFIG_ENV_FAT_FILE, ifname, dev, part);
170 goto err_env_relocate;
171 }
172
173 return env_import(buf1, 1, H_EXTERNAL);
174#endif
175
176err_env_relocate:
177 env_set_default(NULL, 0);
178
179 return -EIO;
180}
181#endif /* LOADENV */
182
183U_BOOT_ENV_LOCATION(fat) = {
184 .location = ENVL_FAT,
185 ENV_NAME("FAT")
186#ifdef LOADENV
187 .load = env_fat_load,
188#endif
189 .save = ENV_SAVE_PTR(env_fat_save),
190};