env/fat.c: support redund environment

Signed-off-by: Brandon Maier <brandon.maier@rockwellcollins.com>
CC: Joe Hershberger <joe.hershberger@ni.com>
CC: Wolfgang Denk <wd@denx.de>

diff --git a/env/Kconfig b/env/Kconfig
index 844c312..08e49c2 100644 (file)
--- a/env/Kconfig
+++ b/env/Kconfig
@@ -476,6 +476,14 @@ config ENV_FAT_FILE
          It's a string of the FAT file name. This file use to store the
          environment.
 
+config ENV_FAT_FILE_REDUND
+       string "Name of the FAT file to use for the environment"
+       depends on ENV_IS_IN_FAT && SYS_REDUNDAND_ENVIRONMENT
+       default "uboot-redund.env"
+       help
+         It's a string of the FAT file name. This file use to store the
+         redundant environment.
+
 config ENV_EXT4_INTERFACE
        string "Name of the block device for the environment"
        depends on ENV_IS_IN_EXT4

diff --git a/env/fat.c b/env/fat.c
index 653a38f..9d37d26 100644 (file)
--- a/env/fat.c
+++ b/env/fat.c
@@ -18,6 +18,7 @@
 #include <fat.h>
 #include <mmc.h>
 #include <asm/cache.h>
+#include <asm/global_data.h>
 #include <linux/stddef.h>
 
 #ifdef CONFIG_SPL_BUILD
@@ -29,6 +30,8 @@
 # define LOADENV
 #endif
 
+DECLARE_GLOBAL_DATA_PTR;
+
 static char *env_fat_device_and_part(void)
 {
 #ifdef CONFIG_MMC
@@ -53,6 +56,7 @@ static int env_fat_save(void)
        env_t __aligned(ARCH_DMA_MINALIGN) env_new;
        struct blk_desc *dev_desc = NULL;
        struct disk_partition info;
+       const char *file = CONFIG_ENV_FAT_FILE;
        int dev, part;
        int err;
        loff_t size;
@@ -78,29 +82,41 @@ static int env_fat_save(void)
                return 1;
        }
 
-       err = file_fat_write(CONFIG_ENV_FAT_FILE, (void *)&env_new, 0, sizeof(env_t),
-                            &size);
+#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
+       if (gd->env_valid == ENV_VALID)
+               file = CONFIG_ENV_FAT_FILE_REDUND;
+#endif
+
+       err = file_fat_write(file, (void *)&env_new, 0, sizeof(env_t), &size);
        if (err == -1) {
                /*
                 * This printf is embedded in the messages from env_save that
                 * will calling it. The missing \n is intentional.
                 */
                printf("Unable to write \"%s\" from %s%d:%d... ",
-                       CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
+                       file, CONFIG_ENV_FAT_INTERFACE, dev, part);
                return 1;
        }
 
+#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
+       gd->env_valid = (gd->env_valid == ENV_REDUND) ? ENV_VALID : ENV_REDUND;
+#endif
+
        return 0;
 }
 
 #ifdef LOADENV
 static int env_fat_load(void)
 {
-       ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
+       ALLOC_CACHE_ALIGN_BUFFER(char, buf1, CONFIG_ENV_SIZE);
+#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
+       ALLOC_CACHE_ALIGN_BUFFER(char, buf2, CONFIG_ENV_SIZE);
+       int err2;
+#endif
        struct blk_desc *dev_desc = NULL;
        struct disk_partition info;
        int dev, part;
-       int err;
+       int err1;
 
 #ifdef CONFIG_MMC
        if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "mmc"))
@@ -124,8 +140,15 @@ static int env_fat_load(void)
                goto err_env_relocate;
        }
 
-       err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE);
-       if (err == -1) {
+       err1 = file_fat_read(CONFIG_ENV_FAT_FILE, buf1, CONFIG_ENV_SIZE);
+#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
+       err2 = file_fat_read(CONFIG_ENV_FAT_FILE_REDUND, buf2, CONFIG_ENV_SIZE);
+
+       err1 = (err1 >= 0) ? 0 : -1;
+       err2 = (err2 >= 0) ? 0 : -1;
+       return env_import_redund(buf1, err1, buf2, err2, H_EXTERNAL);
+#else
+       if (err1 < 0) {
                /*
                 * This printf is embedded in the messages from env_save that
                 * will calling it. The missing \n is intentional.
@@ -135,7 +158,8 @@ static int env_fat_load(void)
                goto err_env_relocate;
        }
 
-       return env_import(buf, 1, H_EXTERNAL);
+       return env_import(buf1, 1, H_EXTERNAL);
+#endif
 
 err_env_relocate:
        env_set_default(NULL, 0);