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118 lines
2.8 KiB
118 lines
2.8 KiB
/****************************************************************************/ |
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/* |
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* uclinux.c -- generic memory mapped MTD driver for uclinux |
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* |
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* (C) Copyright 2002, Greg Ungerer ([email protected]) |
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* |
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* License: GPL |
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*/ |
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/****************************************************************************/ |
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#include <linux/moduleparam.h> |
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#include <linux/types.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/fs.h> |
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#include <linux/mm.h> |
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#include <linux/major.h> |
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#include <linux/mtd/mtd.h> |
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#include <linux/mtd/map.h> |
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#include <linux/mtd/partitions.h> |
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#include <asm/io.h> |
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#include <asm/sections.h> |
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/****************************************************************************/ |
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#ifdef CONFIG_MTD_ROM |
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#define MAP_NAME "rom" |
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#else |
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#define MAP_NAME "ram" |
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#endif |
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static struct map_info uclinux_ram_map = { |
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.name = MAP_NAME, |
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.size = 0, |
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}; |
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static unsigned long physaddr = -1; |
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module_param(physaddr, ulong, S_IRUGO); |
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static struct mtd_info *uclinux_ram_mtdinfo; |
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/****************************************************************************/ |
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static const struct mtd_partition uclinux_romfs[] = { |
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{ .name = "ROMfs" } |
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}; |
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#define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs) |
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/****************************************************************************/ |
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static int uclinux_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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*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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/****************************************************************************/ |
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static int __init uclinux_mtd_init(void) |
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{ |
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struct mtd_info *mtd; |
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struct map_info *mapp; |
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mapp = &uclinux_ram_map; |
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if (physaddr == -1) |
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mapp->phys = (resource_size_t)__bss_stop; |
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else |
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mapp->phys = physaddr; |
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if (!mapp->size) |
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mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8)))); |
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mapp->bankwidth = 4; |
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printk("uclinux[mtd]: probe address=0x%x size=0x%x\n", |
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(int) mapp->phys, (int) mapp->size); |
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/* |
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* The filesystem is guaranteed to be in direct mapped memory. It is |
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* directly following the kernels own bss region. Following the same |
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* mechanism used by architectures setting up traditional initrds we |
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* use phys_to_virt to get the virtual address of its start. |
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*/ |
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mapp->virt = phys_to_virt(mapp->phys); |
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if (mapp->virt == 0) { |
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printk("uclinux[mtd]: no virtual mapping?\n"); |
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return(-EIO); |
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} |
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simple_map_init(mapp); |
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mtd = do_map_probe("map_" MAP_NAME, mapp); |
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if (!mtd) { |
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printk("uclinux[mtd]: failed to find a mapping?\n"); |
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return(-ENXIO); |
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} |
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mtd->owner = THIS_MODULE; |
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mtd->_point = uclinux_point; |
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mtd->priv = mapp; |
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uclinux_ram_mtdinfo = mtd; |
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mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS); |
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return(0); |
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} |
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device_initcall(uclinux_mtd_init); |
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/****************************************************************************/
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