X-Git-Url: https://git.kernelconcepts.de/?p=karo-tx-uboot.git;a=blobdiff_plain;f=common%2Fenv_mmc.c;h=204d23b31a89e88ee22582964cd56681c66cabd8;hp=cc288d487c2e0d7d05df001154d1e4470d47fb74;hb=452a2722ecee9ed9644d6fc7c8d570d725cfdb82;hpb=bfc7bea6adc46e1db2f5a5e3464d7652ed67c864

diff --git a/common/env_mmc.c b/common/env_mmc.c
index cc288d487c..204d23b31a 100644
--- a/common/env_mmc.c
+++ b/common/env_mmc.c
@@ -1,23 +1,7 @@
 /*
- * (C) Copyright 2008-2010 Freescale Semiconductor, Inc.
+ * (C) Copyright 2008-2011 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
+ * SPDX-License-Identifier:	GPL-2.0+ 
  */
 
 /* #define DEBUG */
@@ -29,41 +13,56 @@
 #include <linux/stddef.h>
 #include <malloc.h>
 #include <mmc.h>
+#include <search.h>
+#include <errno.h>
 
-/* references to names in env_common.c */
-extern uchar default_environment[];
+#if defined(CONFIG_ENV_SIZE_REDUND) &&  \
+	(CONFIG_ENV_SIZE_REDUND != CONFIG_ENV_SIZE)
+#error CONFIG_ENV_SIZE_REDUND should be the same as CONFIG_ENV_SIZE
+#endif
 
 char *env_name_spec = "MMC";
 
 #ifdef ENV_IS_EMBEDDED
-extern uchar environment[];
-env_t *env_ptr = (env_t *)(&environment[0]);
+env_t *env_ptr = &environment;
 #else /* ! ENV_IS_EMBEDDED */
-env_t *env_ptr = NULL;
+env_t *env_ptr;
 #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)
+#if !defined(CONFIG_ENV_OFFSET)
+#define CONFIG_ENV_OFFSET 0
+#endif
+
+__weak int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
 {
-	return *((uchar *)(gd->env_addr + index));
+	s64 offset;
+
+	offset = CONFIG_ENV_OFFSET;
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	if (copy)
+		offset = CONFIG_ENV_OFFSET_REDUND;
+#endif
+
+	if (offset < 0)
+		offset += mmc->capacity;
+
+	*env_addr = offset;
+
+	return 0;
 }
 
 int env_init(void)
 {
 	/* use default */
-	gd->env_addr = (ulong)&default_environment[0];
-	gd->env_valid = 1;
+	gd->env_addr	= (ulong)&default_environment[0];
+	gd->env_valid	= 1;
 
 	return 0;
 }
 
-int init_mmc_for_env(struct mmc *mmc)
+static int init_mmc_for_env(struct mmc *mmc)
 {
 	if (!mmc) {
 		puts("No MMC card found\n");
@@ -72,21 +71,39 @@ int init_mmc_for_env(struct mmc *mmc)
 
 	if (mmc_init(mmc)) {
 		puts("MMC init failed\n");
-		return  -1;
+		return -1;
 	}
 
+#ifdef CONFIG_SYS_MMC_ENV_PART
+	if (CONFIG_SYS_MMC_ENV_PART != mmc->part_num) {
+		if (mmc_switch_part(CONFIG_SYS_MMC_ENV_DEV,
+				    CONFIG_SYS_MMC_ENV_PART)) {
+			puts("MMC partition switch failed\n");
+			return -1;
+		}
+	}
+#endif
+
 	return 0;
 }
 
-#ifdef CONFIG_CMD_SAVEENV
+static void fini_mmc_for_env(struct mmc *mmc)
+{
+#ifdef CONFIG_SYS_MMC_ENV_PART
+	if (CONFIG_SYS_MMC_ENV_PART != mmc->part_num)
+		mmc_switch_part(CONFIG_SYS_MMC_ENV_DEV,
+				mmc->part_num);
+#endif
+}
 
-inline int write_env(struct mmc *mmc, unsigned long size,
-			unsigned long offset, const void *buffer)
+#ifdef CONFIG_CMD_SAVEENV
+static 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;
+	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);
@@ -94,31 +111,72 @@ inline int write_env(struct mmc *mmc, unsigned long size,
 	return (n == blk_cnt) ? 0 : -1;
 }
 
+#ifdef CONFIG_ENV_OFFSET_REDUND
+static unsigned char env_flags;
+#endif
+
 int saveenv(void)
 {
+	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
+	ssize_t	len;
+	char	*res;
 	struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
+	u32	offset;
+	int	ret, copy = 0;
 
 	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)) {
+	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);
+		ret = 1;
+		goto fini;
+	}
+
+	env_new->crc = crc32(0, &env_new->data[0], ENV_SIZE);
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	env_new->flags	= ++env_flags; /* increase the serial */
+
+	if (gd->env_valid == 1)
+		copy = 1;
+#endif
+
+	if (mmc_get_env_addr(mmc, copy, &offset)) {
+		ret = 1;
+		goto fini;
+	}
+
+	printf("Writing to %sMMC(%d)... ", copy ? "redundant " : "",
+	       CONFIG_SYS_MMC_ENV_DEV);
+	if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {
 		puts("failed\n");
-		return 1;
+		ret = 1;
+		goto fini;
 	}
 
 	puts("done\n");
-	return 0;
+	ret = 0;
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	gd->env_valid = gd->env_valid == 2 ? 1 : 2;
+#endif
+
+fini:
+	fini_mmc_for_env(mmc);
+	return ret;
 }
 #endif /* CONFIG_CMD_SAVEENV */
 
-inline int read_env(struct mmc *mmc, unsigned long size,
-			unsigned long offset, const void *buffer)
+static 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;
+	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);
@@ -126,27 +184,123 @@ inline int read_env(struct mmc *mmc, unsigned long size,
 	return (n == blk_cnt) ? 0 : -1;
 }
 
+#ifdef CONFIG_ENV_OFFSET_REDUND
 void env_relocate_spec(void)
 {
 #if !defined(ENV_IS_EMBEDDED)
 	struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
+	u32 offset1, offset2;
+	int read1_fail = 0, read2_fail = 0;
+	int crc1_ok = 0, crc2_ok = 0;
+	env_t *ep;
+	int ret;
+
+	ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env1, 1);
+	ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env2, 1);
+
+	if (tmp_env1 == NULL || tmp_env2 == NULL) {
+		puts("Can't allocate buffers for environment\n");
+		ret = 1;
+		goto err;
+	}
 
-	if (init_mmc_for_env(mmc))
-		return;
+	if (init_mmc_for_env(mmc)) {
+		ret = 1;
+		goto err;
+	}
+
+	if (mmc_get_env_addr(mmc, 0, &offset1) ||
+	    mmc_get_env_addr(mmc, 1, &offset2)) {
+		ret = 1;
+		goto fini;
+	}
+
+	read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);
+	read2_fail = read_env(mmc, CONFIG_ENV_SIZE, offset2, tmp_env2);
+
+	if (read1_fail && read2_fail)
+		puts("*** Error - No Valid Environment Area found\n");
+	else if (read1_fail || read2_fail)
+		puts("*** Warning - some problems detected "
+		     "reading environment; recovered successfully\n");
+
+	crc1_ok = !read1_fail &&
+		(crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
+	crc2_ok = !read2_fail &&
+		(crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
+
+	if (!crc1_ok && !crc2_ok) {
+		ret = 1;
+		goto fini;
+	} else if (crc1_ok && !crc2_ok) {
+		gd->env_valid = 1;
+	} else if (!crc1_ok && crc2_ok) {
+		gd->env_valid = 2;
+	} else {
+		/* both ok - check serial */
+		if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
+			gd->env_valid = 2;
+		else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
+			gd->env_valid = 1;
+		else if (tmp_env1->flags > tmp_env2->flags)
+			gd->env_valid = 1;
+		else if (tmp_env2->flags > tmp_env1->flags)
+			gd->env_valid = 2;
+		else /* flags are equal - almost impossible */
+			gd->env_valid = 1;
+	}
+
+	free(env_ptr);
+
+	if (gd->env_valid == 1)
+		ep = tmp_env1;
+	else
+		ep = tmp_env2;
 
-	if (read_env(mmc, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, env_ptr))
-		return use_default();
+	env_flags = ep->flags;
+	env_import((char *)ep, 0);
+	ret = 0;
 
-	if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
-		return use_default();
+fini:
+	fini_mmc_for_env(mmc);
+err:
+	if (ret)
+		set_default_env(NULL);
 
-	gd->env_valid = 1;
 #endif
 }
-
-#if !defined(ENV_IS_EMBEDDED)
-static void use_default()
+#else /* ! CONFIG_ENV_OFFSET_REDUND */
+void env_relocate_spec(void)
 {
-	set_default_env(NULL);
-}
+#if !defined(ENV_IS_EMBEDDED)
+	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
+	struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
+	u32 offset;
+	int ret;
+
+	if (init_mmc_for_env(mmc)) {
+		ret = 1;
+		goto err;
+	}
+
+	if (mmc_get_env_addr(mmc, 0, &offset)) {
+		ret = 1;
+		goto fini;
+	}
+
+	if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
+		ret = 1;
+		goto fini;
+	}
+
+	env_import(buf, 1);
+	ret = 0;
+
+fini:
+	fini_mmc_for_env(mmc);
+err:
+	if (ret)
+		set_default_env(NULL);
 #endif
+}
+#endif /* CONFIG_ENV_OFFSET_REDUND */