95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
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/*
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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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* $Id: map_rom.c,v 1.23 2005/01/05 18:05:12 dwmw2 Exp $
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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/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/compatmac.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 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 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 = kmalloc(sizeof(*mtd), GFP_KERNEL);
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if (!mtd)
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return NULL;
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memset(mtd, 0, sizeof(*mtd));
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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->read = maprom_read;
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mtd->write = maprom_write;
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mtd->sync = maprom_nop;
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mtd->flags = MTD_CAP_ROM;
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mtd->erasesize = 131072;
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while(mtd->size & (mtd->erasesize - 1))
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mtd->erasesize >>= 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_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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printk(KERN_NOTICE "maprom_write called\n");
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return -EIO;
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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 <dwmw2@infradead.org>");
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MODULE_DESCRIPTION("MTD chip driver for ROM chips");
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