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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/mtd/chips/map_rom.c | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/mtd/chips/map_rom.c')
-rw-r--r-- | drivers/mtd/chips/map_rom.c | 94 |
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 0000000..624c12c --- /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"); |