44fe63fc0f
I was (at least) the second person trying to fix a warning by sparse, so document in the code why this is a bad idea and add an extern declaration to make sparse happy. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Mike Frysinger <vapier@gentoo.org> Acked-by: Greg Ungerer <gerg@uclinux.org> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
143 lines
3.5 KiB
C
143 lines
3.5 KiB
C
/****************************************************************************/
|
|
|
|
/*
|
|
* 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");
|
|
|
|
/****************************************************************************/
|