diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/mtd/maps/uclinux.c |
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/maps/uclinux.c')
-rw-r--r-- | drivers/mtd/maps/uclinux.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/mtd/maps/uclinux.c b/drivers/mtd/maps/uclinux.c new file mode 100644 index 000000000000..811d92e5f5b1 --- /dev/null +++ b/drivers/mtd/maps/uclinux.c @@ -0,0 +1,127 @@ +/****************************************************************************/ + +/* + * uclinux.c -- generic memory mapped MTD driver for uclinux + * + * (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com) + * + * $Id: uclinux.c,v 1.10 2005/01/05 18:05:13 dwmw2 Exp $ + */ + +/****************************************************************************/ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/fs.h> +#include <linux/major.h> +#include <linux/root_dev.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/map.h> +#include <linux/mtd/partitions.h> +#include <asm/io.h> + +/****************************************************************************/ + + +/****************************************************************************/ + +struct map_info uclinux_ram_map = { + .name = "RAM", +}; + +struct mtd_info *uclinux_ram_mtdinfo; + +/****************************************************************************/ + +struct mtd_partition uclinux_romfs[] = { + { .name = "ROMfs" } +}; + +#define NUM_PARTITIONS (sizeof(uclinux_romfs) / sizeof(uclinux_romfs[0])) + +/****************************************************************************/ + +int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len, + size_t *retlen, u_char **mtdbuf) +{ + struct map_info *map = mtd->priv; + *mtdbuf = (u_char *) (map->virt + ((int) from)); + *retlen = len; + return(0); +} + +/****************************************************************************/ + +int __init uclinux_mtd_init(void) +{ + struct mtd_info *mtd; + struct map_info *mapp; + extern char _ebss; + + mapp = &uclinux_ram_map; + mapp->phys = (unsigned long) &_ebss; + mapp->size = PAGE_ALIGN(*((unsigned long *)((&_ebss) + 8))); + mapp->bankwidth = 4; + + printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n", + (int) mapp->map_priv_2, (int) mapp->size); + + mapp->virt = ioremap_nocache(mapp->phys, mapp->size); + + if (mapp->virt == 0) { + printk("uclinux[mtd]: ioremap_nocache() failed\n"); + return(-EIO); + } + + simple_map_init(mapp); + + mtd = do_map_probe("map_ram", mapp); + if (!mtd) { + printk("uclinux[mtd]: failed to find a mapping?\n"); + iounmap(mapp->virt); + return(-ENXIO); + } + + mtd->owner = THIS_MODULE; + mtd->point = uclinux_point; + mtd->priv = mapp; + + uclinux_ram_mtdinfo = mtd; + add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS); + + printk("uclinux[mtd]: set %s to be root filesystem\n", + uclinux_romfs[0].name); + ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, 0); + put_mtd_device(mtd); + + return(0); +} + +/****************************************************************************/ + +void __exit uclinux_mtd_cleanup(void) +{ + if (uclinux_ram_mtdinfo) { + del_mtd_partitions(uclinux_ram_mtdinfo); + map_destroy(uclinux_ram_mtdinfo); + uclinux_ram_mtdinfo = NULL; + } + if (uclinux_ram_map.map_priv_1) { + iounmap((void *) uclinux_ram_map.virt); + uclinux_ram_map.virt = 0; + } +} + +/****************************************************************************/ + +module_init(uclinux_mtd_init); +module_exit(uclinux_mtd_cleanup); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>"); +MODULE_DESCRIPTION("Generic RAM based MTD for uClinux"); + +/****************************************************************************/ |