1 // SPDX-License-Identifier: GPL-2.0
16 #include <linux/mtd/mtd.h>
17 #include <linux/mtd/map.h>
23 static int maprom_erase (struct mtd_info *mtd, struct erase_info *info);
24 static int maprom_point (struct mtd_info *mtd, loff_t from, size_t len,
26 static int maprom_unpoint(struct mtd_info *mtd, loff_t from, size_t len);
31 	.name	= "map_rom",
39 	erase_size = of_get_property(map->device_node, "erase-size", NULL);  in default_erasesize()
41 	return !erase_size ? map->size : be32_to_cpu(*erase_size);  in default_erasesize()
46 	struct mtd_info *mtd;  in map_rom_probe()  local
48 	mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);  in map_rom_probe()
49 	if (!mtd)  in map_rom_probe()
52 	map->fldrv = &maprom_chipdrv;  in map_rom_probe()
53 	mtd->priv = map;  in map_rom_probe()
54 	mtd->name = map->name;  in map_rom_probe()
55 	mtd->type = MTD_ROM;  in map_rom_probe()
56 	mtd->size = map->size;  in map_rom_probe()
57 	mtd->_point = maprom_point;  in map_rom_probe()
58 	mtd->_unpoint = maprom_unpoint;  in map_rom_probe()
59 	mtd->_read = maprom_read;  in map_rom_probe()
60 	mtd->_write = maprom_write;  in map_rom_probe()
61 	mtd->_sync = maprom_nop;  in map_rom_probe()
62 	mtd->_erase = maprom_erase;  in map_rom_probe()
63 	mtd->flags = MTD_CAP_ROM;  in map_rom_probe()
64 	mtd->erasesize = default_erasesize(map);  in map_rom_probe()
65 	mtd->writesize = 1;  in map_rom_probe()
66 	mtd->writebufsize = 1;  in map_rom_probe()
69 	return mtd;  in map_rom_probe()
73 static int maprom_point(struct mtd_info *mtd, loff_t from, size_t len,  in maprom_point()  argument
76 	struct map_info *map = mtd->priv;  in maprom_point()
78 	if (!map->virt)  in maprom_point()
79 		return -EINVAL;  in maprom_point()
80 	*virt = map->virt + from;  in maprom_point()
82 		*phys = map->phys + from;  in maprom_point()
87 static int maprom_unpoint(struct mtd_info *mtd, loff_t from, size_t len)  in maprom_unpoint()  argument
92 static int maprom_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)  in maprom_read()  argument
94 	struct map_info *map = mtd->priv;  in maprom_read()
101 static void maprom_nop(struct mtd_info *mtd)  in maprom_nop()  argument
106 static int maprom_write (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char …  in maprom_write()  argument
108 	return -EROFS;  in maprom_write()
111 static int maprom_erase (struct mtd_info *mtd, struct erase_info *info)  in maprom_erase()  argument
114 	return -EROFS;  in maprom_erase()
133 MODULE_DESCRIPTION("MTD chip driver for ROM chips");