Add support for loading and saving the environment to a FAT partition

[karo-tx-uboot.git] / common / env_fat.c

diff --git a/common/env_fat.c b/common/env_fat.c
new file mode 100644 (file)
index 0000000..bad92aa
--- /dev/null
+++ b/common/env_fat.c
@@ -0,0 +1,156 @@
+/*
+ * (c) Copyright 2011 by Tigris Elektronik GmbH
+ *
+ * Author:
+ *  Maximilian Schwerin <mvs@tigris.de>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.         See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+
+#include <command.h>
+#include <environment.h>
+#include <linux/stddef.h>
+#include <malloc.h>
+#include <search.h>
+#include <errno.h>
+#include <fat.h>
+#include <mmc.h>
+
+char *env_name_spec = "FAT";
+
+env_t *env_ptr;
+
+DECLARE_GLOBAL_DATA_PTR;
+
+uchar env_get_char_spec(int index)
+{
+       return *((uchar *)(gd->env_addr + index));
+}
+
+int env_init(void)
+{
+       /* use default */
+       gd->env_addr = (ulong)&default_environment[0];
+       gd->env_valid = 1;
+
+       return 0;
+}
+
+#ifdef CONFIG_CMD_SAVEENV
+int saveenv(void)
+{
+       env_t   env_new;
+       ssize_t len;
+       char    *res;
+       block_dev_desc_t *dev_desc = NULL;
+       int dev = FAT_ENV_DEVICE;
+       int part = FAT_ENV_PART;
+
+       res = (char *)&env_new.data;
+       len = hexport_r(&env_htab, '\0', &res, ENV_SIZE, 0, NULL);
+       if (len < 0) {
+               error("Cannot export environment: errno = %d\n", errno);
+               return 1;
+       }
+
+#ifdef CONFIG_MMC
+       if (strcmp (FAT_ENV_INTERFACE, "mmc") == 0) {
+               struct mmc *mmc = find_mmc_device(dev);
+
+               if (!mmc) {
+                       printf("no mmc device at slot %x\n", dev);
+                       return 1;
+               }
+
+               mmc->has_init = 0;
+               mmc_init(mmc);
+       }
+#endif /* CONFIG_MMC */
+
+       dev_desc = get_dev(FAT_ENV_INTERFACE, dev);
+       if (dev_desc == NULL) {
+               printf("Failed to find %s%d\n",
+                       FAT_ENV_INTERFACE, dev);
+               return 1;
+       }
+       if (fat_register_device(dev_desc, part) != 0) {
+               printf("Failed to register %s%d:%d\n",
+                       FAT_ENV_INTERFACE, dev, part);
+               return 1;
+       }
+
+       env_new.crc = crc32(0, env_new.data, ENV_SIZE);
+       if (file_fat_write(FAT_ENV_FILE, (void *)&env_new, sizeof(env_t)) == -1) {
+               printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
+                       FAT_ENV_FILE, FAT_ENV_INTERFACE, dev, part);
+               return 1;
+       }
+
+       puts("done\n");
+       return 0;
+}
+#endif /* CONFIG_CMD_SAVEENV */
+
+void env_relocate_spec(void)
+{
+       char buf[CONFIG_ENV_SIZE];
+       block_dev_desc_t *dev_desc = NULL;
+       int dev = FAT_ENV_DEVICE;
+       int part = FAT_ENV_PART;
+
+#ifdef CONFIG_MMC
+       if (strcmp (FAT_ENV_INTERFACE, "mmc") == 0) {
+               struct mmc *mmc = find_mmc_device(dev);
+
+               if (!mmc) {
+                       printf("no mmc device at slot %x\n", dev);
+                       set_default_env(NULL);
+                       return;
+               }
+
+               mmc->has_init = 0;
+               mmc_init(mmc);
+       }
+#endif /* CONFIG_MMC */
+
+       dev_desc = get_dev(FAT_ENV_INTERFACE, dev);
+       if (dev_desc == NULL) {
+               printf("Failed to find %s%d\n",
+                       FAT_ENV_INTERFACE, dev);
+               set_default_env(NULL);
+               return;
+       }
+       if (fat_register_device(dev_desc, part) != 0) {
+               printf("Failed to register %s%d:%d\n",
+                       FAT_ENV_INTERFACE, dev, part);
+               set_default_env(NULL);
+               return;
+       }
+
+       if (file_fat_read(FAT_ENV_FILE, (unsigned char *)&buf, CONFIG_ENV_SIZE) == -1) {
+               printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
+                       FAT_ENV_FILE, FAT_ENV_INTERFACE, dev, part);
+               set_default_env(NULL);
+               return;
+       }
+
+       env_import(buf, 1);
+}