1 files changed, 32 insertions, 13 deletions

diff --git a/drivers/mtd/chips/map_rom.c b/drivers/mtd/chips/map_rom.c
index 624c12c232c..47a43cf7e5c 100644
--- a/drivers/mtd/chips/map_rom.c
+++ b/drivers/mtd/chips/map_rom.c
@@ -1,7 +1,6 @@
 /*
  * Common code to handle map devices which are simple ROM
  * (C) 2000 Red Hat. GPL'd.
- * $Id: map_rom.c,v 1.23 2005/01/05 18:05:12 dwmw2 Exp $
  */
 
 #include <linux/module.h>
@@ -14,12 +13,14 @@
 #include <linux/init.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/map.h>
-#include <linux/mtd/compatmac.h>
 
 static int maprom_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
 static int maprom_write (struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
 static void maprom_nop (struct mtd_info *);
 static struct mtd_info *map_rom_probe(struct map_info *map);
+static int maprom_erase (struct mtd_info *mtd, struct erase_info *info);
+static unsigned long maprom_unmapped_area(struct mtd_info *, unsigned long,
+					  unsigned long, unsigned long);
 
 static struct mtd_chip_driver maprom_chipdrv = {
 	.probe	= map_rom_probe,
@@ -31,30 +32,43 @@ static struct mtd_info *map_rom_probe(struct map_info *map)
 {
 	struct mtd_info *mtd;
 
-	mtd = kmalloc(sizeof(*mtd), GFP_KERNEL);
+	mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);
 	if (!mtd)
 		return NULL;
 
-	memset(mtd, 0, sizeof(*mtd));
-
 	map->fldrv = &maprom_chipdrv;
 	mtd->priv = map;
 	mtd->name = map->name;
 	mtd->type = MTD_ROM;
 	mtd->size = map->size;
-	mtd->read = maprom_read;
-	mtd->write = maprom_write;
-	mtd->sync = maprom_nop;
+	mtd->_get_unmapped_area = maprom_unmapped_area;
+	mtd->_read = maprom_read;
+	mtd->_write = maprom_write;
+	mtd->_sync = maprom_nop;
+	mtd->_erase = maprom_erase;
 	mtd->flags = MTD_CAP_ROM;
-	mtd->erasesize = 131072;
- 	while(mtd->size & (mtd->erasesize - 1))
-		mtd->erasesize >>= 1;
+	mtd->erasesize = map->size;
+	mtd->writesize = 1;
 
 	__module_get(THIS_MODULE);
 	return mtd;
 }
 
 
+/*
+ * Allow NOMMU mmap() to directly map the device (if not NULL)
+ * - return the address to which the offset maps
+ * - return -ENOSYS to indicate refusal to do the mapping
+ */
+static unsigned long maprom_unmapped_area(struct mtd_info *mtd,
+					  unsigned long len,
+					  unsigned long offset,
+					  unsigned long flags)
+{
+	struct map_info *map = mtd->priv;
+	return (unsigned long) map->virt + offset;
+}
+
 static int maprom_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
 {
 	struct map_info *map = mtd->priv;
@@ -71,8 +85,13 @@ static void maprom_nop(struct mtd_info *mtd)
 
 static int maprom_write (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
 {
-	printk(KERN_NOTICE "maprom_write called\n");
-	return -EIO;
+	return -EROFS;
+}
+
+static int maprom_erase (struct mtd_info *mtd, struct erase_info *info)
+{
+	/* We do our best 8) */
+	return -EROFS;
 }
 
 static int __init map_rom_init(void)