[mirror_ubuntu-bionic-kernel.git] / drivers / mtd / maps / uclinux.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");

/****************************************************************************/
Commit	Line	Data
1da177e4 LT	1	/****************************************************************************/
	2
	3	/*
	4	* uclinux.c -- generic memory mapped MTD driver for uclinux
	5	*
	6	* (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com)
1da177e4 LT	7	*/
	8
	9	/****************************************************************************/
	10
1da177e4 LT	11	#include <linux/module.h>
	12	#include <linux/types.h>
	13	#include <linux/init.h>
	14	#include <linux/kernel.h>
	15	#include <linux/fs.h>
27ac792c	16	#include <linux/mm.h>
1da177e4	17	#include <linux/major.h>
1da177e4 LT	18	#include <linux/mtd/mtd.h>
	19	#include <linux/mtd/map.h>
	20	#include <linux/mtd/partitions.h>
	21	#include <asm/io.h>
363737d6	22	#include <asm/sections.h>
1da177e4	23
1da177e4 LT	24	/****************************************************************************/
1da177e4 LT	25
81f53ff8 UKK	26	#ifdef CONFIG_MTD_ROM
	27	#define MAP_NAME "rom"
	28	#else
	29	#define MAP_NAME "ram"
	30	#endif
	31
44fe63fc UKK	32	/*
	33	* Blackfin uses uclinux_ram_map during startup, so it must not be static.
	34	* Provide a dummy declaration to make sparse happy.
	35	*/
	36	extern struct map_info uclinux_ram_map;
	37
1da177e4	38	struct map_info uclinux_ram_map = {
81f53ff8	39	.name = MAP_NAME,
fa254ecb	40	.size = 0,
1da177e4 LT	41	};
1da177e4 LT	42
81f53ff8 UKK	43	static unsigned long physaddr = -1;
	44	module_param(physaddr, ulong, S_IRUGO);
	45
9f31f4b9	46	static struct mtd_info *uclinux_ram_mtdinfo;
1da177e4 LT	47
	48	/****************************************************************************/
	49
9f31f4b9	50	static struct mtd_partition uclinux_romfs[] = {
1da177e4 LT	51	{ .name = "ROMfs" }
	52	};
	53
87d10f3c	54	#define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs)
1da177e4 LT	55
	56	/****************************************************************************/
	57
9f31f4b9	58	static int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,
a98889f3	59	size_t retlen, void virt, resource_size_t phys)
1da177e4 LT	60	{
1da177e4 LT	61	struct map_info *map = mtd->priv;
a98889f3 JH	62	*virt = map->virt + from;
	63	if (phys)
	64	*phys = map->phys + from;
1da177e4 LT	65	*retlen = len;
	66	return(0);
	67	}
	68
	69	/****************************************************************************/
	70
769455e2	71	static int __init uclinux_mtd_init(void)
1da177e4 LT	72	{
	73	struct mtd_info *mtd;
	74	struct map_info *mapp;
1da177e4 LT	75
1da177e4 LT	76	mapp = &uclinux_ram_map;
81f53ff8 UKK	77
	78	if (physaddr == -1)
	79	mapp->phys = (resource_size_t)__bss_stop;
	80	else
	81	mapp->phys = physaddr;
	82
fa254ecb MF	83	if (!mapp->size)
fa254ecb MF	84	mapp->size = PAGE_ALIGN(ntohl(((unsigned long )(mapp->phys + 8))));
1da177e4 LT	85	mapp->bankwidth = 4;
1da177e4 LT	86
81f53ff8	87	printk("uclinux[mtd]: probe address=0x%x size=0x%x\n",
f6515db4	88	(int) mapp->phys, (int) mapp->size);
1da177e4	89
08a3c4bc GU	90	/*
	91	* The filesystem is guaranteed to be in direct mapped memory. It is
	92	* directly following the kernels own bss region. Following the same
	93	* mechanism used by architectures setting up traditional initrds we
	94	* use phys_to_virt to get the virtual address of its start.
	95	*/
	96	mapp->virt = phys_to_virt(mapp->phys);
1da177e4 LT	97
1da177e4 LT	98	if (mapp->virt == 0) {
08a3c4bc	99	printk("uclinux[mtd]: no virtual mapping?\n");
1da177e4 LT	100	return(-EIO);
	101	}
	102
	103	simple_map_init(mapp);
	104
81f53ff8	105	mtd = do_map_probe("map_" MAP_NAME, mapp);
1da177e4 LT	106	if (!mtd) {
1da177e4 LT	107	printk("uclinux[mtd]: failed to find a mapping?\n");
1da177e4 LT	108	return(-ENXIO);
1da177e4 LT	109	}
69f34c98	110
1da177e4	111	mtd->owner = THIS_MODULE;
3c3c10bb	112	mtd->_point = uclinux_point;
1da177e4 LT	113	mtd->priv = mapp;
	114
	115	uclinux_ram_mtdinfo = mtd;
5e7e9686	116	mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS);
1da177e4	117
1da177e4 LT	118	return(0);
	119	}
	120
	121	/****************************************************************************/
	122
769455e2	123	static void __exit uclinux_mtd_cleanup(void)
1da177e4 LT	124	{
1da177e4 LT	125	if (uclinux_ram_mtdinfo) {
5e7e9686	126	mtd_device_unregister(uclinux_ram_mtdinfo);
1da177e4 LT	127	map_destroy(uclinux_ram_mtdinfo);
	128	uclinux_ram_mtdinfo = NULL;
	129	}
08a3c4bc	130	if (uclinux_ram_map.virt)
1da177e4	131	uclinux_ram_map.virt = 0;
1da177e4 LT	132	}
	133
	134	/****************************************************************************/
	135
	136	module_init(uclinux_mtd_init);
	137	module_exit(uclinux_mtd_cleanup);
	138
	139	MODULE_LICENSE("GPL");
	140	MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
81f53ff8	141	MODULE_DESCRIPTION("Generic MTD for uClinux");
1da177e4 LT	142
1da177e4 LT	143	/****************************************************************************/