patch-2.4.19 linux-2.4.19/drivers/mtd/mtdpart.c

• Lines: 133
• Date: Fri Aug 2 17:39:44 2002
• Orig file: linux-2.4.18/drivers/mtd/mtdpart.c
• Orig date: Thu Oct 4 15:14:59 2001

diff -urN linux-2.4.18/drivers/mtd/mtdpart.c linux-2.4.19/drivers/mtd/mtdpart.c
@@ -5,8 +5,12 @@
  *
  * This code is GPL
  *
- * $Id: mtdpart.c,v 1.23 2001/10/02 15:05:11 dwmw2 Exp $
- */
+ * $Id: mtdpart.c,v 1.27 2002/03/08 16:34:35 rkaiser Exp $
+ * - with protection register access removed until that code is merged in 2.4.
+ *
+ * 	02-21-2002	Thomas Gleixner <gleixner@autronix.de>
+ *			added support for read_oob, write_oob
+ */	
 
 #include <linux/module.h>
 #include <linux/types.h>
@@ -28,6 +32,7 @@
 	u_int32_t offset;
 	int index;
 	struct list_head list;
+	int registered;
 };
 
 /*
@@ -54,6 +59,18 @@
 					len, retlen, buf);
 }
 
+static int part_read_oob (struct mtd_info *mtd, loff_t from, size_t len, 
+			size_t *retlen, u_char *buf)
+{
+	struct mtd_part *part = PART(mtd);
+	if (from >= mtd->size)
+		len = 0;
+	else if (from + len > mtd->size)
+		len = mtd->size - from;
+	return part->master->read_oob (part->master, from + part->offset, 
+					len, retlen, buf);
+}
+
 static int part_write (struct mtd_info *mtd, loff_t to, size_t len,
 			size_t *retlen, const u_char *buf)
 {
@@ -68,6 +85,20 @@
 					len, retlen, buf);
 }
 
+static int part_write_oob (struct mtd_info *mtd, loff_t to, size_t len,
+			size_t *retlen, const u_char *buf)
+{
+	struct mtd_part *part = PART(mtd);
+	if (!(mtd->flags & MTD_WRITEABLE))
+		return -EROFS;
+	if (to >= mtd->size)
+		len = 0;
+	else if (to + len > mtd->size)
+		len = mtd->size - to;
+	return part->master->write_oob (part->master, to + part->offset, 
+					len, retlen, buf);
+}
+
 static int part_writev (struct mtd_info *mtd,  const struct iovec *vecs,
 			 unsigned long count, loff_t to, size_t *retlen)
 {
@@ -148,7 +179,8 @@
 		if (slave->master == master) {
 			struct list_head *prev = node->prev;
 			__list_del(prev, node->next);
-			del_mtd_device(&slave->mtd);
+			if(slave->registered)
+				del_mtd_device(&slave->mtd);
 			kfree(slave);
 			node = prev;
 		}
@@ -198,18 +230,21 @@
 
 		slave->mtd.name = parts[i].name;
 		slave->mtd.bank_size = master->bank_size;
-
 		slave->mtd.module = master->module;
 
 		slave->mtd.read = part_read;
 		slave->mtd.write = part_write;
+
+		if (master->read_oob)
+			slave->mtd.read_oob = part_read_oob;
+		if (master->write_oob)
+			slave->mtd.write_oob = part_write_oob;
 		if (master->sync)
 			slave->mtd.sync = part_sync;
 		if (!i && master->suspend && master->resume) {
 				slave->mtd.suspend = part_suspend;
 				slave->mtd.resume = part_resume;
 		}
-
 		if (master->writev)
 			slave->mtd.writev = part_writev;
 		if (master->readv)
@@ -225,6 +260,15 @@
 
 		if (slave->offset == MTDPART_OFS_APPEND)
 			slave->offset = cur_offset;
+		if (slave->offset == MTDPART_OFS_NXTBLK) {
+			u_int32_t emask = master->erasesize-1;
+			slave->offset = (cur_offset + emask) & ~emask;
+			if (slave->offset != cur_offset) {
+				printk(KERN_NOTICE "Moving partition %d: "
+				       "0x%08x -> 0x%08x\n", i,
+				       cur_offset, slave->offset);
+			}
+		}
 		if (slave->mtd.size == MTDPART_SIZ_FULL)
 			slave->mtd.size = master->size - slave->offset;
 		cur_offset = slave->offset + slave->mtd.size;
@@ -279,8 +323,17 @@
 				parts[i].name);
 		}
 
-		/* register our partition */
-		add_mtd_device(&slave->mtd);
+		if(parts[i].mtdp)
+		{	/* store the object pointer (caller may or may not register it */
+			*parts[i].mtdp = &slave->mtd;
+			slave->registered = 0;
+		}
+		else
+		{
+			/* register our partition */
+			add_mtd_device(&slave->mtd);
+			slave->registered = 1;
+		}
 	}
 
 	return 0;