env: Add support for UBI environment

UBI is a better place for the environment on NAND devices because it
handles wear-leveling and bad blocks.

Gluebi is needed in Linux to access the env as an MTD partition.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>

6 files changed, 144 insertions, 2 deletions

diff --git a/README b/README
index da8b68a5a9..93c700947a 100644
--- a/README
+++ b/README
@@ -3548,6 +3548,27 @@ but it can not erase, write this NOR flash by SRIO or PCIE interface.
 	environment. If redundant environment is used, it will be copied to
 	CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
 
+- CONFIG_ENV_IS_IN_UBI:
+
+	Define this if you have an UBI volume that you want to use for the
+	environment.  This has the benefit of wear-leveling the environment
+	accesses, which is important on NAND.
+
+	- CONFIG_ENV_UBI_PART:
+
+	  Define this to a string that is the mtd partition containing the UBI.
+
+	- CONFIG_ENV_UBI_VOLUME:
+
+	  Define this to the name of the volume that you want to store the
+	  environment in.
+
+	- CONFIG_UBI_SILENCE_MSG
+	- CONFIG_UBIFS_SILENCE_MSG
+
+	  You will probably want to define these to avoid a really noisy system
+	  when storing the env in UBI.
+
 - CONFIG_SYS_SPI_INIT_OFFSET
 
 	Defines offset to the initial SPI buffer area in DPRAM. The
diff --git a/common/Makefile b/common/Makefile
index f6313110c9..0e0fff1ffa 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -66,6 +66,7 @@ COBJS-$(CONFIG_ENV_IS_IN_NVRAM) += env_nvram.o
 COBJS-$(CONFIG_ENV_IS_IN_ONENAND) += env_onenand.o
 COBJS-$(CONFIG_ENV_IS_IN_SPI_FLASH) += env_sf.o
 COBJS-$(CONFIG_ENV_IS_IN_REMOTE) += env_remote.o
+COBJS-$(CONFIG_ENV_IS_IN_UBI) += env_ubi.o
 COBJS-$(CONFIG_ENV_IS_NOWHERE) += env_nowhere.o
 
 # command
diff --git a/common/cmd_nvedit.c b/common/cmd_nvedit.c
index fab8694621..afa128ece2 100644
--- a/common/cmd_nvedit.c
+++ b/common/cmd_nvedit.c
@@ -62,9 +62,10 @@ DECLARE_GLOBAL_DATA_PTR;
 	!defined(CONFIG_ENV_IS_IN_ONENAND)	&& \
 	!defined(CONFIG_ENV_IS_IN_SPI_FLASH)	&& \
 	!defined(CONFIG_ENV_IS_IN_REMOTE)	&& \
+	!defined(CONFIG_ENV_IS_IN_UBI)		&& \
 	!defined(CONFIG_ENV_IS_NOWHERE)
 # error Define one of CONFIG_ENV_IS_IN_{EEPROM|FLASH|DATAFLASH|ONENAND|\
-SPI_FLASH|NVRAM|MMC|FAT|REMOTE} or CONFIG_ENV_IS_NOWHERE
+SPI_FLASH|NVRAM|MMC|FAT|REMOTE|UBI} or CONFIG_ENV_IS_NOWHERE
 #endif
 
 /*
diff --git a/common/env_ubi.c b/common/env_ubi.c
new file mode 100644
index 0000000000..0c592a6f63
--- /dev/null
+++ b/common/env_ubi.c
@@ -0,0 +1,103 @@
+/*
+ * (c) Copyright 2012 by National Instruments,
+ *        Joe Hershberger <joe.hershberger@ni.com>
+ *
+ * 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 <errno.h>
+#include <malloc.h>
+#include <search.h>
+#include <ubi_uboot.h>
+#undef crc32
+
+char *env_name_spec = "UBI";
+
+env_t *env_ptr;
+
+DECLARE_GLOBAL_DATA_PTR;
+
+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)
+{
+	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
+	ssize_t	len;
+	char *res;
+
+	res = (char *)&env_new->data;
+	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
+	if (len < 0) {
+		error("Cannot export environment: errno = %d\n", errno);
+		return 1;
+	}
+
+	if (ubi_part(CONFIG_ENV_UBI_PART, NULL)) {
+		printf("\n** Cannot find mtd partition \"%s\"\n",
+		       CONFIG_ENV_UBI_PART);
+		return 1;
+	}
+
+	env_new->crc = crc32(0, env_new->data, ENV_SIZE);
+
+	if (ubi_volume_write(CONFIG_ENV_UBI_VOLUME, (void *)env_new,
+			     CONFIG_ENV_SIZE)) {
+		printf("\n** Unable to write env to %s:%s **\n",
+		       CONFIG_ENV_UBI_PART, CONFIG_ENV_UBI_VOLUME);
+		return 1;
+	}
+
+	puts("done\n");
+	return 0;
+}
+#endif /* CONFIG_CMD_SAVEENV */
+
+void env_relocate_spec(void)
+{
+	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
+
+	if (ubi_part(CONFIG_ENV_UBI_PART, NULL)) {
+		printf("\n** Cannot find mtd partition \"%s\"\n",
+		       CONFIG_ENV_UBI_PART);
+		set_default_env(NULL);
+		return;
+	}
+
+	if (ubi_volume_read(CONFIG_ENV_UBI_VOLUME, (void *)&buf,
+			    CONFIG_ENV_SIZE)) {
+		printf("\n** Unable to read env from %s:%s **\n",
+		       CONFIG_ENV_UBI_PART, CONFIG_ENV_UBI_VOLUME);
+		set_default_env(NULL);
+		return;
+	}
+
+	env_import(buf, 1);
+}
diff --git a/include/environment.h b/include/environment.h
index e64b43d2d9..ece073fcc3 100644
--- a/include/environment.h
+++ b/include/environment.h
@@ -96,6 +96,21 @@ extern unsigned long nand_env_oob_offset;
 # endif
 #endif /* CONFIG_ENV_IS_IN_NAND */
 
+#if defined(CONFIG_ENV_IS_IN_UBI)
+# ifndef CONFIG_ENV_UBI_PART
+#  error "Need to define CONFIG_ENV_UBI_PART when using CONFIG_ENV_IS_IN_UBI"
+# endif
+# ifndef CONFIG_ENV_UBI_VOLUME
+#  error "Need to define CONFIG_ENV_UBI_VOLUME when using CONFIG_ENV_IS_IN_UBI"
+# endif
+# ifndef CONFIG_ENV_SIZE
+#  error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_UBI"
+# endif
+# ifndef CONFIG_CMD_UBI
+#  error "Need to define CONFIG_CMD_UBI when using CONFIG_ENV_IS_IN_UBI"
+# endif
+#endif /* CONFIG_ENV_IS_IN_UBI */
+
 /* Embedded env is only supported for some flash types */
 #ifdef CONFIG_ENV_IS_EMBEDDED
 # if	!defined(CONFIG_ENV_IS_IN_FLASH)	&& \
diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
index bf30234190..0dee682629 100644
--- a/tools/env/fw_env.c
+++ b/tools/env/fw_env.c
@@ -968,7 +968,8 @@ static int flash_read (int fd)
 		}
 		if (mtdinfo.type != MTD_NORFLASH &&
 		    mtdinfo.type != MTD_NANDFLASH &&
-		    mtdinfo.type != MTD_DATAFLASH) {
+		    mtdinfo.type != MTD_DATAFLASH &&
+		    mtdinfo.type != MTD_UBIVOLUME) {
 			fprintf (stderr, "Unsupported flash type %u on %s\n",
 				 mtdinfo.type, DEVNAME(dev_current));
 			return -1;