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87194abaa5
Some of the files in mtd/chips do not have a SPDX license header, presumably because the text string "GPL'd" didn't parse with Thomas rulesets for magic license tagging. Fix this, the code is initially from RedHat which clearly targeted the Linux kernel and intended it to be GPLv2. In any case the original author appears to be David Woodhouse who can then confirm this. Cc: David Woodhouse <dwmw2@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20230603185200.3571174-1-linus.walleij@linaro.org
133 lines
3.1 KiB
C
133 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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.
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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 <dwmw2@infradead.org>");
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MODULE_DESCRIPTION("MTD chip driver for ROM chips");
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