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path: root/drivers/mtd/chips/map_rom.c
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Diffstat (limited to 'drivers/mtd/chips/map_rom.c')
-rw-r--r--drivers/mtd/chips/map_rom.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/mtd/chips/map_rom.c b/drivers/mtd/chips/map_rom.c
index c76d6e5f47e..076090a67b9 100644
--- a/drivers/mtd/chips/map_rom.c
+++ b/drivers/mtd/chips/map_rom.c
@@ -20,6 +20,8 @@ static int maprom_write (struct mtd_info *, loff_t, size_t, size_t *, const u_ch
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,
@@ -40,6 +42,7 @@ static struct mtd_info *map_rom_probe(struct map_info *map)
mtd->name = map->name;
mtd->type = MTD_ROM;
mtd->size = map->size;
+ mtd->get_unmapped_area = maprom_unmapped_area;
mtd->read = maprom_read;
mtd->write = maprom_write;
mtd->sync = maprom_nop;
@@ -53,6 +56,20 @@ static struct mtd_info *map_rom_probe(struct map_info *map)
}
+/*
+ * 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;