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132 lines
3.1 KiB
132 lines
3.1 KiB
/* |
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* Common code to handle map devices which are simple ROM |
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* (C) 2000 Red Hat. GPL'd. |
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*/ |
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <asm/io.h> |
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#include <asm/byteorder.h> |
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#include <linux/errno.h> |
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#include <linux/slab.h> |
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#include <linux/init.h> |
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#include <linux/of.h> |
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#include <linux/mtd/mtd.h> |
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#include <linux/mtd/map.h> |
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static int maprom_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *); |
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static int maprom_write (struct mtd_info *, loff_t, size_t, size_t *, const u_char *); |
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static void maprom_nop (struct mtd_info *); |
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static struct mtd_info *map_rom_probe(struct map_info *map); |
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static int maprom_erase (struct mtd_info *mtd, struct erase_info *info); |
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static int maprom_point (struct mtd_info *mtd, loff_t from, size_t len, |
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size_t *retlen, void **virt, resource_size_t *phys); |
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static int maprom_unpoint(struct mtd_info *mtd, loff_t from, size_t len); |
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static struct mtd_chip_driver maprom_chipdrv = { |
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.probe = map_rom_probe, |
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.name = "map_rom", |
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.module = THIS_MODULE |
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}; |
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static unsigned int default_erasesize(struct map_info *map) |
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{ |
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const __be32 *erase_size = NULL; |
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erase_size = of_get_property(map->device_node, "erase-size", NULL); |
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return !erase_size ? map->size : be32_to_cpu(*erase_size); |
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} |
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static struct mtd_info *map_rom_probe(struct map_info *map) |
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{ |
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struct mtd_info *mtd; |
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mtd = kzalloc(sizeof(*mtd), GFP_KERNEL); |
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if (!mtd) |
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return NULL; |
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map->fldrv = &maprom_chipdrv; |
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mtd->priv = map; |
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mtd->name = map->name; |
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mtd->type = MTD_ROM; |
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mtd->size = map->size; |
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mtd->_point = maprom_point; |
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mtd->_unpoint = maprom_unpoint; |
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mtd->_read = maprom_read; |
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mtd->_write = maprom_write; |
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mtd->_sync = maprom_nop; |
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mtd->_erase = maprom_erase; |
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mtd->flags = MTD_CAP_ROM; |
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mtd->erasesize = default_erasesize(map); |
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mtd->writesize = 1; |
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mtd->writebufsize = 1; |
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__module_get(THIS_MODULE); |
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return mtd; |
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} |
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static int maprom_point(struct mtd_info *mtd, loff_t from, size_t len, |
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size_t *retlen, void **virt, resource_size_t *phys) |
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{ |
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struct map_info *map = mtd->priv; |
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if (!map->virt) |
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return -EINVAL; |
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*virt = map->virt + from; |
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if (phys) |
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*phys = map->phys + from; |
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*retlen = len; |
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return 0; |
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} |
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static int maprom_unpoint(struct mtd_info *mtd, loff_t from, size_t len) |
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{ |
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return 0; |
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} |
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static int maprom_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) |
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{ |
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struct map_info *map = mtd->priv; |
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map_copy_from(map, buf, from, len); |
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*retlen = len; |
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return 0; |
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} |
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static void maprom_nop(struct mtd_info *mtd) |
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{ |
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/* Nothing to see here */ |
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} |
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static int maprom_write (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf) |
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{ |
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return -EROFS; |
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} |
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static int maprom_erase (struct mtd_info *mtd, struct erase_info *info) |
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{ |
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/* We do our best 8) */ |
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return -EROFS; |
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} |
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static int __init map_rom_init(void) |
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{ |
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register_mtd_chip_driver(&maprom_chipdrv); |
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return 0; |
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} |
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static void __exit map_rom_exit(void) |
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{ |
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unregister_mtd_chip_driver(&maprom_chipdrv); |
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} |
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module_init(map_rom_init); |
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module_exit(map_rom_exit); |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("David Woodhouse <[email protected]>"); |
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MODULE_DESCRIPTION("MTD chip driver for ROM chips");
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