diff options
Diffstat (limited to 'drivers/mtd/maps/uclinux.c')
| -rw-r--r-- | drivers/mtd/maps/uclinux.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/drivers/mtd/maps/uclinux.c b/drivers/mtd/maps/uclinux.c new file mode 100644 index 000000000..c1af83db5 --- /dev/null +++ b/drivers/mtd/maps/uclinux.c @@ -0,0 +1,143 @@ +/****************************************************************************/ + +/* + * uclinux.c -- generic memory mapped MTD driver for uclinux + * + * (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com) + */ + +/****************************************************************************/ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/fs.h> +#include <linux/mm.h> +#include <linux/major.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/map.h> +#include <linux/mtd/partitions.h> +#include <asm/io.h> +#include <asm/sections.h> + +/****************************************************************************/ + +#ifdef CONFIG_MTD_ROM +#define MAP_NAME "rom" +#else +#define MAP_NAME "ram" +#endif + +/* + * Blackfin uses uclinux_ram_map during startup, so it must not be static. + * Provide a dummy declaration to make sparse happy. + */ +extern struct map_info uclinux_ram_map; + +struct map_info uclinux_ram_map = { + .name = MAP_NAME, + .size = 0, +}; + +static unsigned long physaddr = -1; +module_param(physaddr, ulong, S_IRUGO); + +static struct mtd_info *uclinux_ram_mtdinfo; + +/****************************************************************************/ + +static struct mtd_partition uclinux_romfs[] = { + { .name = "ROMfs" } +}; + +#define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs) + +/****************************************************************************/ + +static int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len, + size_t *retlen, void **virt, resource_size_t *phys) +{ + struct map_info *map = mtd->priv; + *virt = map->virt + from; + if (phys) + *phys = map->phys + from; + *retlen = len; + return(0); +} + +/****************************************************************************/ + +static int __init uclinux_mtd_init(void) +{ + struct mtd_info *mtd; + struct map_info *mapp; + + mapp = &uclinux_ram_map; + + if (physaddr == -1) + mapp->phys = (resource_size_t)__bss_stop; + else + mapp->phys = physaddr; + + if (!mapp->size) + mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8)))); + mapp->bankwidth = 4; + + printk("uclinux[mtd]: probe address=0x%x size=0x%x\n", + (int) mapp->phys, (int) mapp->size); + + /* + * The filesystem is guaranteed to be in direct mapped memory. It is + * directly following the kernels own bss region. Following the same + * mechanism used by architectures setting up traditional initrds we + * use phys_to_virt to get the virtual address of its start. + */ + mapp->virt = phys_to_virt(mapp->phys); + + if (mapp->virt == 0) { + printk("uclinux[mtd]: no virtual mapping?\n"); + return(-EIO); + } + + simple_map_init(mapp); + + mtd = do_map_probe("map_" MAP_NAME, mapp); + if (!mtd) { + printk("uclinux[mtd]: failed to find a mapping?\n"); + return(-ENXIO); + } + + mtd->owner = THIS_MODULE; + mtd->_point = uclinux_point; + mtd->priv = mapp; + + uclinux_ram_mtdinfo = mtd; + mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS); + + return(0); +} + +/****************************************************************************/ + +static void __exit uclinux_mtd_cleanup(void) +{ + if (uclinux_ram_mtdinfo) { + mtd_device_unregister(uclinux_ram_mtdinfo); + map_destroy(uclinux_ram_mtdinfo); + uclinux_ram_mtdinfo = NULL; + } + if (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 MTD for uClinux"); + +/****************************************************************************/ |