From 59da721a2288b8aec751a2716f7ab60f2ea0c925 Mon Sep 17 00:00:00 2001
From: Nicolas Pitre <nico@cam.org>
Date: Sat, 6 Aug 2005 05:51:33 +0100
Subject: [PATCH] [JFFS2] Teach JFFS2 about Sibley flash

Intels Sibley flash needs JFFS2 write buffer functionality

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 fs/jffs2/fs.c       | 16 ++++++++++++++--
 fs/jffs2/os-linux.h | 13 +++++++++++--
 fs/jffs2/wbuf.c     | 22 +++++++++++++++++++++-
 3 files changed, 46 insertions(+), 5 deletions(-)

diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c
index cc18b92234c..79b4bdc76f7 100644
--- a/fs/jffs2/fs.c
+++ b/fs/jffs2/fs.c
@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: fs.c,v 1.61 2005/07/24 15:29:56 dedekind Exp $
+ * $Id: fs.c,v 1.62 2005/08/06 04:51:30 nico Exp $
  *
  */
 
@@ -664,7 +664,14 @@ static int jffs2_flash_setup(struct jffs2_sb_info *c) {
 		if (ret)
 			return ret;
 	}
-	
+
+	/* and Intel "Sibley" flash */
+	if (jffs2_nor_wbuf_flash(c)) {
+		ret = jffs2_nor_wbuf_flash_setup(c);
+		if (ret)
+			return ret;
+	}
+
 	return ret;
 }
 
@@ -683,4 +690,9 @@ void jffs2_flash_cleanup(struct jffs2_sb_info *c) {
 	if (jffs2_dataflash(c)) {
 		jffs2_dataflash_cleanup(c);
 	}
+
+	/* and Intel "Sibley" flash */
+	if (jffs2_nor_wbuf_flash(c)) {
+		jffs2_nor_wbuf_flash_cleanup(c);
+	}
 }
diff --git a/fs/jffs2/os-linux.h b/fs/jffs2/os-linux.h
index 0fc952eaf8c..c3c1619fb13 100644
--- a/fs/jffs2/os-linux.h
+++ b/fs/jffs2/os-linux.h
@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: os-linux.h,v 1.59 2005/07/17 11:13:46 dedekind Exp $
+ * $Id: os-linux.h,v 1.60 2005/08/06 04:51:30 nico Exp $
  *
  */
 
@@ -85,16 +85,21 @@ static inline void jffs2_init_inode_info(struct jffs2_inode_info *f)
 #define jffs2_wbuf_process NULL
 #define jffs2_nor_ecc(c) (0)
 #define jffs2_dataflash(c) (0)
+#define jffs2_nor_wbuf_flash(c) (0)
 #define jffs2_nor_ecc_flash_setup(c) (0)
 #define jffs2_nor_ecc_flash_cleanup(c) do {} while (0)
 #define jffs2_dataflash_setup(c) (0)
 #define jffs2_dataflash_cleanup(c) do {} while (0)
+#define jffs2_nor_wbuf_flash_setup(c) (0)
+#define jffs2_nor_wbuf_flash_cleanup(c) do {} while (0)
 
 #else /* NAND and/or ECC'd NOR support present */
 
 #define jffs2_is_writebuffered(c) (c->wbuf != NULL)
 #define SECTOR_ADDR(x) ( ((unsigned long)(x) / (unsigned long)(c->sector_size)) * c->sector_size )
-#define jffs2_can_mark_obsolete(c) ((c->mtd->type == MTD_NORFLASH && !(c->mtd->flags & MTD_ECC)) || c->mtd->type == MTD_RAM)
+#define jffs2_can_mark_obsolete(c) \
+  ((c->mtd->type == MTD_NORFLASH && !(c->mtd->flags & (MTD_ECC|MTD_PROGRAM_REGIONS))) || \
+   c->mtd->type == MTD_RAM)
 #define jffs2_cleanmarker_oob(c) (c->mtd->type == MTD_NANDFLASH)
 
 #define jffs2_flash_write_oob(c, ofs, len, retlen, buf) ((c)->mtd->write_oob((c)->mtd, ofs, len, retlen, buf))
@@ -124,6 +129,10 @@ void jffs2_nor_ecc_flash_cleanup(struct jffs2_sb_info *c);
 int jffs2_dataflash_setup(struct jffs2_sb_info *c);
 void jffs2_dataflash_cleanup(struct jffs2_sb_info *c);
 
+#define jffs2_nor_wbuf_flash(c) (c->mtd->type == MTD_NORFLASH && (c->mtd->flags & MTD_PROGRAM_REGIONS))
+int jffs2_nor_wbuf_flash_setup(struct jffs2_sb_info *c);
+void jffs2_nor_wbuf_flash_cleanup(struct jffs2_sb_info *c);
+
 #endif /* WRITEBUFFER */
 
 /* erase.c */
diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
index 251ac3d86f9..8c06d3a2b17 100644
--- a/fs/jffs2/wbuf.c
+++ b/fs/jffs2/wbuf.c
@@ -9,7 +9,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: wbuf.c,v 1.96 2005/07/22 10:32:08 dedekind Exp $
+ * $Id: wbuf.c,v 1.97 2005/08/06 04:51:30 nico Exp $
  *
  */
 
@@ -1235,3 +1235,23 @@ int jffs2_nor_ecc_flash_setup(struct jffs2_sb_info *c) {
 void jffs2_nor_ecc_flash_cleanup(struct jffs2_sb_info *c) {
 	kfree(c->wbuf);
 }
+
+int jffs2_nor_wbuf_flash_setup(struct jffs2_sb_info *c) {
+	/* Cleanmarker currently occupies a whole programming region */
+	c->cleanmarker_size = MTD_PROGREGION_SIZE(c->mtd);
+
+	/* Initialize write buffer */
+	init_rwsem(&c->wbuf_sem);
+	c->wbuf_pagesize = MTD_PROGREGION_SIZE(c->mtd);
+	c->wbuf_ofs = 0xFFFFFFFF;
+
+	c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
+	if (!c->wbuf)
+		return -ENOMEM;
+
+	return 0;
+}
+
+void jffs2_nor_wbuf_flash_cleanup(struct jffs2_sb_info *c) {
+	kfree(c->wbuf);
+}
-- 
2.11.4.GIT