From 5779d8d985d95104ad74332f5fa3cb6c67645509 Mon Sep 17 00:00:00 2001
From: wdenk <wdenk>
Date: Sat, 6 Dec 2003 23:55:10 +0000
Subject: =?UTF-8?q?*=20Patch=20by=20Nicolas=20Lacressonni=E8re,=2012=20Nov?=
 =?UTF-8?q?=202003:=20=20=20update=20for=20for=20Atmel=20AT91RM9200DK=20de?=
 =?UTF-8?q?velopment=20kit:=20=20=20-=20support=20for=20environment=20vari?=
 =?UTF-8?q?ables=20in=20DataFlash=20=20=20-=20Atmel=20DataFlash=20AT45DB12?=
 =?UTF-8?q?82=20support?=
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* Patch by Jeff Carr, 11 Nov 2003:
  add support for new version of 8270 processors

* Patches by George G. Davis, 05 Nov 2003:
  - only pass the ARM linux initrd tag to the kernel when an initrd
    is actually present
  - update omap1510inn configuration file
---
 common/env_dataflash.c | 104 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 common/env_dataflash.c

(limited to 'common/env_dataflash.c')

diff --git a/common/env_dataflash.c b/common/env_dataflash.c
new file mode 100644
index 0000000000..8bfbbc943e
--- /dev/null
+++ b/common/env_dataflash.c
@@ -0,0 +1,104 @@
+/* LowLevel function for DataFlash environment support
+ * Author : Gilles Gastaldi (Atmel)
+ *
+ * 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>
+
+#if defined(CFG_ENV_IS_IN_DATAFLASH) /* Environment is in DataFlash */
+
+#include <command.h>
+#include <environment.h>
+#include <linux/stddef.h>
+#include <malloc.h>
+#include <dataflash.h>
+
+env_t *env_ptr = NULL;
+
+char * env_name_spec = "dataflash";
+
+extern int read_dataflash (unsigned long addr, unsigned long size, char
+*result);
+extern int write_dataflash (unsigned long addr_dest, unsigned long addr_src,
+		     unsigned long size);
+extern int AT91F_DataflashInit (void);
+extern uchar default_environment[];
+/* extern int default_environment_size; */
+
+
+uchar env_get_char_spec (int index)
+{
+	uchar c;
+	read_dataflash (CFG_ENV_ADDR+index+offsetof(env_t,data),1,&c);
+	return (c);
+}
+
+void env_relocate_spec (void)
+{
+	read_dataflash (CFG_ENV_ADDR,CFG_ENV_SIZE,(uchar *)env_ptr);
+}
+
+int saveenv(void)
+{
+/* env must be copied to do not alter env structure in memory*/
+unsigned char temp[CFG_ENV_SIZE];
+int i;
+	memcpy(temp, env_ptr, CFG_ENV_SIZE);
+	return write_dataflash (CFG_ENV_ADDR, (unsigned long)temp, CFG_ENV_SIZE);
+}
+
+/************************************************************************
+ * Initialize Environment use
+ *
+ * We are still running from ROM, so data use is limited
+ * Use a (moderately small) buffer on the stack
+ */
+int env_init(void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	ulong crc, len, new;
+	unsigned off;
+	uchar buf[64];
+	if (gd->env_valid == 0){
+		AT91F_DataflashInit();	/* prepare for DATAFLASH read/write */
+
+		/* read old CRC */
+		read_dataflash (CFG_ENV_ADDR+offsetof(env_t,crc),sizeof(ulong),&crc);
+		new = 0;
+		len = ENV_SIZE;
+		off = offsetof(env_t,data);
+		while (len > 0) {
+			int n = (len > sizeof(buf)) ? sizeof(buf) : len;
+			read_dataflash (CFG_ENV_ADDR+off,n , buf);
+			new = crc32 (new, buf, n);
+			len -= n;
+			off += n;
+		}
+		if (crc == new) {
+			gd->env_addr  = offsetof(env_t,data);
+			gd->env_valid = 1;
+		} else {
+			gd->env_addr  = (ulong)&default_environment[0];
+			gd->env_valid = 0;
+		}
+	}
+
+ 	return (0);
+}
+
+#endif /* CFG_ENV_IS_IN_DATAFLASH */
-- 
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