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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/mtd/chips/map_rom.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/mtd/chips/map_rom.c')
-rw-r--r-- | kernel/drivers/mtd/chips/map_rom.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/kernel/drivers/mtd/chips/map_rom.c b/kernel/drivers/mtd/chips/map_rom.c new file mode 100644 index 000000000..e67f73ab4 --- /dev/null +++ b/kernel/drivers/mtd/chips/map_rom.c @@ -0,0 +1,124 @@ +/* + * Common code to handle map devices which are simple ROM + * (C) 2000 Red Hat. GPL'd. + */ + +#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 unsigned long maprom_unmapped_area(struct mtd_info *, unsigned long, + unsigned long, unsigned long); + +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->_get_unmapped_area = maprom_unmapped_area; + 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; +} + + +/* + * Allow NOMMU mmap() to directly map the device (if not NULL) + * - return the address to which the offset maps + * - return -ENOSYS to indicate refusal to do the mapping + */ +static unsigned long maprom_unmapped_area(struct mtd_info *mtd, + unsigned long len, + unsigned long offset, + unsigned long flags) +{ + struct map_info *map = mtd->priv; + return (unsigned long) map->virt + offset; +} + +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"); |