Save environment data to mmc.

This patch is to save environment data to mmc card.
It uses interfaces defined in generic mmc.

Signed-off-by: Terry Lv <r65388@freescale.com>
Acked-by: Stefano Babic <sbabic@denx.de>

1 files changed, 153 insertions, 0 deletions

diff --git a/common/env_mmc.c b/common/env_mmc.c
new file mode 100644
index 0000000..14203b6
--- /dev/null
+++ b/common/env_mmc.c
@@ -0,0 +1,153 @@
+/*
+ * (C) Copyright 2008-2010 Freescale Semiconductor, Inc.
+ *
+ * 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
+ */
+
+/* #define DEBUG */
+
+#include <common.h>
+
+#include <command.h>
+#include <environment.h>
+#include <linux/stddef.h>
+#include <malloc.h>
+#include <mmc.h>
+
+/* references to names in env_common.c */
+extern uchar default_environment[];
+
+char *env_name_spec = "MMC";
+
+#ifdef ENV_IS_EMBEDDED
+extern uchar environment[];
+env_t *env_ptr = (env_t *)(&environment[0]);
+#else /* ! ENV_IS_EMBEDDED */
+env_t *env_ptr = NULL;
+#endif /* ENV_IS_EMBEDDED */
+
+/* local functions */
+#if !defined(ENV_IS_EMBEDDED)
+static void use_default(void);
+#endif
+
+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;
+}
+
+int init_mmc_for_env(struct mmc *mmc)
+{
+	if (!mmc) {
+		puts("No MMC card found\n");
+		return -1;
+	}
+
+	if (mmc_init(mmc)) {
+		puts("MMC init failed\n");
+		return  -1;
+	}
+
+	return 0;
+}
+
+#ifdef CONFIG_CMD_SAVEENV
+
+inline int write_env(struct mmc *mmc, unsigned long size,
+			unsigned long offset, const void *buffer)
+{
+	uint blk_start, blk_cnt, n;
+
+	blk_start = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
+	blk_cnt   = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
+
+	n = mmc->block_dev.block_write(CONFIG_SYS_MMC_ENV_DEV, blk_start,
+					blk_cnt, (u_char *)buffer);
+
+	return (n == blk_cnt) ? 0 : -1;
+}
+
+int saveenv(void)
+{
+	struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
+
+	if (init_mmc_for_env(mmc))
+		return 1;
+
+	printf("Writing to MMC(%d)... ", CONFIG_SYS_MMC_ENV_DEV);
+	if (write_env(mmc, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, env_ptr)) {
+		puts("failed\n");
+		return 1;
+	}
+
+	puts("done\n");
+	return 0;
+}
+#endif /* CONFIG_CMD_SAVEENV */
+
+inline int read_env(struct mmc *mmc, unsigned long size,
+			unsigned long offset, const void *buffer)
+{
+	uint blk_start, blk_cnt, n;
+
+	blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
+	blk_cnt   = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
+
+	n = mmc->block_dev.block_read(CONFIG_SYS_MMC_ENV_DEV, blk_start,
+					blk_cnt, (uchar *)buffer);
+
+	return (n == blk_cnt) ? 0 : -1;
+}
+
+void env_relocate_spec(void)
+{
+#if !defined(ENV_IS_EMBEDDED)
+	struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
+
+	if (init_mmc_for_env(mmc))
+		return;
+
+	if (read_env(mmc, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, env_ptr))
+		return use_default();
+
+	if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
+		return use_default();
+
+	gd->env_valid = 1;
+#endif
+}
+
+#if !defined(ENV_IS_EMBEDDED)
+static void use_default()
+{
+	puts ("*** Warning - bad CRC or MMC, using default environment\n\n");
+	set_default_env();
+}
+#endif