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Diffstat (limited to 'drivers/mtd/chips/map_rom.c')
-rw-r--r--drivers/mtd/chips/map_rom.c133
1 files changed, 133 insertions, 0 deletions
diff --git a/drivers/mtd/chips/map_rom.c b/drivers/mtd/chips/map_rom.c
new file mode 100644
index 0000000000..0823b15aaa
--- /dev/null
+++ b/drivers/mtd/chips/map_rom.c
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Common code to handle map devices which are simple ROM
+ * (C) 2000 Red Hat.
+ */
+
+#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/of.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.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 int maprom_point (struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, void **virt, resource_size_t *phys);
+static int maprom_unpoint(struct mtd_info *mtd, loff_t from, size_t len);
+
+
+static struct mtd_chip_driver maprom_chipdrv = {
+ .probe = map_rom_probe,
+ .name = "map_rom",
+ .module = THIS_MODULE
+};
+
+static unsigned int default_erasesize(struct map_info *map)
+{
+ const __be32 *erase_size = NULL;
+
+ erase_size = of_get_property(map->device_node, "erase-size", NULL);
+
+ return !erase_size ? map->size : be32_to_cpu(*erase_size);
+}
+
+static struct mtd_info *map_rom_probe(struct map_info *map)
+{
+ struct mtd_info *mtd;
+
+ mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);
+ if (!mtd)
+ return NULL;
+
+ map->fldrv = &maprom_chipdrv;
+ mtd->priv = map;
+ mtd->name = map->name;
+ mtd->type = MTD_ROM;
+ mtd->size = map->size;
+ mtd->_point = maprom_point;
+ mtd->_unpoint = maprom_unpoint;
+ mtd->_read = maprom_read;
+ mtd->_write = maprom_write;
+ mtd->_sync = maprom_nop;
+ mtd->_erase = maprom_erase;
+ mtd->flags = MTD_CAP_ROM;
+ mtd->erasesize = default_erasesize(map);
+ mtd->writesize = 1;
+ mtd->writebufsize = 1;
+
+ __module_get(THIS_MODULE);
+ return mtd;
+}
+
+
+static int maprom_point(struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, void **virt, resource_size_t *phys)
+{
+ struct map_info *map = mtd->priv;
+
+ if (!map->virt)
+ return -EINVAL;
+ *virt = map->virt + from;
+ if (phys)
+ *phys = map->phys + from;
+ *retlen = len;
+ return 0;
+}
+
+static int maprom_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
+{
+ return 0;
+}
+
+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)
+{
+ 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)
+{
+ 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");