1 files changed, 94 insertions, 0 deletions

diff --git a/drivers/mtd/chips/map_rom.c b/drivers/mtd/chips/map_rom.c
new file mode 100644
index 000000000000..624c12c232c8
--- /dev/null
+++ b/drivers/mtd/chips/map_rom.c
@@ -0,0 +1,94 @@
+/*
+ * 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>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <asm/io.h>
+#include <asm/byteorder.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#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 struct mtd_chip_driver maprom_chipdrv = {
+        .probe  = map_rom_probe,
+        .name   = "map_rom",
+        .module = THIS_MODULE
+};
+
+static struct mtd_info *map_rom_probe(struct map_info *map)
+{
+        struct mtd_info *mtd;
+
+        mtd = kmalloc(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->flags = MTD_CAP_ROM;
+        mtd->erasesize = 131072;
+        while(mtd->size & (mtd->erasesize - 1))
+                mtd->erasesize >>= 1;
+
+        __module_get(THIS_MODULE);
+        return mtd;
+}
+
+
+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;
+
+        map_copy_from(map, buf, from, len);
+        *retlen = len;
+        return 0;
+}
+
+static void maprom_nop(struct mtd_info *mtd)
+{
+        /* Nothing to see here */
+}
+
+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;
+}
+
+static int __init map_rom_init(void)
+{
+        register_mtd_chip_driver(&maprom_chipdrv);
+        return 0;
+}
+
+static void __exit map_rom_exit(void)
+{
+        unregister_mtd_chip_driver(&maprom_chipdrv);
+}
+
+module_init(map_rom_init);
+module_exit(map_rom_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
+MODULE_DESCRIPTION("MTD chip driver for ROM chips");