| /****************************************************************************/ |
| |
| /* |
| * uclinux.c -- generic memory mapped MTD driver for uclinux |
| * |
| * (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com) |
| * |
| * License: GPL |
| */ |
| |
| /****************************************************************************/ |
| |
| #include <linux/moduleparam.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 const 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); |
| } |
| device_initcall(uclinux_mtd_init); |
| |
| /****************************************************************************/ |