[deliverable/linux.git] / drivers / mtd / devices / mtdram.c

/*
 * mtdram - a test mtd device
 * Author: Alexander Larsson <alex@cendio.se>
 *
 * Copyright (c) 1999 Alexander Larsson <alex@cendio.se>
 * Copyright (c) 2005 Joern Engel <joern@wh.fh-wedel.de>
 *
 * This code is GPL
 *
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/mtdram.h>

static unsigned long total_size = CONFIG_MTDRAM_TOTAL_SIZE;
static unsigned long erase_size = CONFIG_MTDRAM_ERASE_SIZE;
#define MTDRAM_TOTAL_SIZE (total_size * 1024)
#define MTDRAM_ERASE_SIZE (erase_size * 1024)

#ifdef MODULE
module_param(total_size, ulong, 0);
MODULE_PARM_DESC(total_size, "Total device size in KiB");
module_param(erase_size, ulong, 0);
MODULE_PARM_DESC(erase_size, "Device erase block size in KiB");
#endif

// We could store these in the mtd structure, but we only support 1 device..
static struct mtd_info *mtd_info;

static int ram_erase(struct mtd_info *mtd, struct erase_info *instr)
{
	memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
	instr->state = MTD_ERASE_DONE;
	mtd_erase_callback(instr);
	return 0;
}

static int ram_point(struct mtd_info *mtd, loff_t from, size_t len,
		size_t *retlen, void **virt, resource_size_t *phys)
{
	*virt = mtd->priv + from;
	*retlen = len;
	return 0;
}

static int ram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
{
	return 0;
}

/*
 * Allow NOMMU mmap() to directly map the device (if not NULL)
 * - return the address to which the offset maps
 * - return -ENOSYS to indicate refusal to do the mapping
 */
static unsigned long ram_get_unmapped_area(struct mtd_info *mtd,
					   unsigned long len,
					   unsigned long offset,
					   unsigned long flags)
{
	return (unsigned long) mtd->priv + offset;
}

static int ram_read(struct mtd_info *mtd, loff_t from, size_t len,
		size_t *retlen, u_char *buf)
{
	memcpy(buf, mtd->priv + from, len);
	*retlen = len;
	return 0;
}

static int ram_write(struct mtd_info *mtd, loff_t to, size_t len,
		size_t *retlen, const u_char *buf)
{
	memcpy((char *)mtd->priv + to, buf, len);
	*retlen = len;
	return 0;
}

static void __exit cleanup_mtdram(void)
{
	if (mtd_info) {
		mtd_device_unregister(mtd_info);
		vfree(mtd_info->priv);
		kfree(mtd_info);
	}
}

int mtdram_init_device(struct mtd_info *mtd, void *mapped_address,
		unsigned long size, const char *name)
{
	memset(mtd, 0, sizeof(*mtd));

	/* Setup the MTD structure */
	mtd->name = name;
	mtd->type = MTD_RAM;
	mtd->flags = MTD_CAP_RAM;
	mtd->size = size;
	mtd->writesize = 1;
	mtd->writebufsize = 64; /* Mimic CFI NOR flashes */
	mtd->erasesize = MTDRAM_ERASE_SIZE;
	mtd->priv = mapped_address;

	mtd->owner = THIS_MODULE;
	mtd->_erase = ram_erase;
	mtd->_point = ram_point;
	mtd->_unpoint = ram_unpoint;
	mtd->_get_unmapped_area = ram_get_unmapped_area;
	mtd->_read = ram_read;
	mtd->_write = ram_write;

	if (mtd_device_register(mtd, NULL, 0))
		return -EIO;

	return 0;
}

static int __init init_mtdram(void)
{
	void *addr;
	int err;

	if (!total_size)
		return -EINVAL;

	/* Allocate some memory */
	mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
	if (!mtd_info)
		return -ENOMEM;

	addr = vmalloc(MTDRAM_TOTAL_SIZE);
	if (!addr) {
		kfree(mtd_info);
		mtd_info = NULL;
		return -ENOMEM;
	}
	err = mtdram_init_device(mtd_info, addr, MTDRAM_TOTAL_SIZE, "mtdram test device");
	if (err) {
		vfree(addr);
		kfree(mtd_info);
		mtd_info = NULL;
		return err;
	}
	memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
	return err;
}

module_init(init_mtdram);
module_exit(cleanup_mtdram);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>");
MODULE_DESCRIPTION("Simulated MTD driver for testing");
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* mtdram - a test mtd device
1da177e4 LT	3	* Author: Alexander Larsson <alex@cendio.se>
	4	*
	5	* Copyright (c) 1999 Alexander Larsson <alex@cendio.se>
c13cbf3b	6	* Copyright (c) 2005 Joern Engel <joern@wh.fh-wedel.de>
1da177e4 LT	7	*
	8	* This code is GPL
	9	*
	10	*/
	11
1da177e4 LT	12	#include <linux/module.h>
	13	#include <linux/slab.h>
	14	#include <linux/ioport.h>
	15	#include <linux/vmalloc.h>
	16	#include <linux/init.h>
1da177e4	17	#include <linux/mtd/mtd.h>
456d9fc9	18	#include <linux/mtd/mtdram.h>
1da177e4	19
1da177e4 LT	20	static unsigned long total_size = CONFIG_MTDRAM_TOTAL_SIZE;
1da177e4 LT	21	static unsigned long erase_size = CONFIG_MTDRAM_ERASE_SIZE;
1da177e4 LT	22	#define MTDRAM_TOTAL_SIZE (total_size * 1024)
1da177e4 LT	23	#define MTDRAM_ERASE_SIZE (erase_size * 1024)
1da177e4	24
c13cbf3b JE	25	#ifdef MODULE
	26	module_param(total_size, ulong, 0);
	27	MODULE_PARM_DESC(total_size, "Total device size in KiB");
	28	module_param(erase_size, ulong, 0);
	29	MODULE_PARM_DESC(erase_size, "Device erase block size in KiB");
	30	#endif
1da177e4 LT	31
	32	// We could store these in the mtd structure, but we only support 1 device..
	33	static struct mtd_info *mtd_info;
	34
c13cbf3b	35	static int ram_erase(struct mtd_info mtd, struct erase_info instr)
1da177e4	36	{
c13cbf3b	37	memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
c13cbf3b JE	38	instr->state = MTD_ERASE_DONE;
c13cbf3b JE	39	mtd_erase_callback(instr);
c13cbf3b	40	return 0;
1da177e4 LT	41	}
1da177e4 LT	42
c13cbf3b	43	static int ram_point(struct mtd_info *mtd, loff_t from, size_t len,
a98889f3	44	size_t retlen, void virt, resource_size_t phys)
1da177e4	45	{
a98889f3	46	*virt = mtd->priv + from;
c13cbf3b JE	47	*retlen = len;
c13cbf3b JE	48	return 0;
1da177e4 LT	49	}
1da177e4 LT	50
5e4e6e3f	51	static int ram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
1da177e4	52	{
5e4e6e3f	53	return 0;
1da177e4 LT	54	}
1da177e4 LT	55
402d3265 DH	56	/*
	57	* Allow NOMMU mmap() to directly map the device (if not NULL)
	58	* - return the address to which the offset maps
	59	* - return -ENOSYS to indicate refusal to do the mapping
	60	*/
	61	static unsigned long ram_get_unmapped_area(struct mtd_info *mtd,
	62	unsigned long len,
	63	unsigned long offset,
	64	unsigned long flags)
	65	{
	66	return (unsigned long) mtd->priv + offset;
	67	}
	68
1da177e4	69	static int ram_read(struct mtd_info *mtd, loff_t from, size_t len,
c13cbf3b	70	size_t retlen, u_char buf)
1da177e4	71	{
c13cbf3b	72	memcpy(buf, mtd->priv + from, len);
c13cbf3b JE	73	*retlen = len;
c13cbf3b JE	74	return 0;
1da177e4 LT	75	}
	76
	77	static int ram_write(struct mtd_info *mtd, loff_t to, size_t len,
c13cbf3b	78	size_t retlen, const u_char buf)
1da177e4	79	{
c13cbf3b	80	memcpy((char *)mtd->priv + to, buf, len);
c13cbf3b JE	81	*retlen = len;
c13cbf3b JE	82	return 0;
1da177e4 LT	83	}
	84
	85	static void __exit cleanup_mtdram(void)
	86	{
c13cbf3b	87	if (mtd_info) {
ee0e87b1	88	mtd_device_unregister(mtd_info);
f9101210	89	vfree(mtd_info->priv);
c13cbf3b JE	90	kfree(mtd_info);
c13cbf3b JE	91	}
1da177e4 LT	92	}
1da177e4 LT	93
c13cbf3b	94	int mtdram_init_device(struct mtd_info mtd, void mapped_address,
0a8899b3	95	unsigned long size, const char *name)
1da177e4	96	{
c13cbf3b JE	97	memset(mtd, 0, sizeof(*mtd));
	98
	99	/* Setup the MTD structure */
	100	mtd->name = name;
21c8db9e	101	mtd->type = MTD_RAM;
c13cbf3b JE	102	mtd->flags = MTD_CAP_RAM;
c13cbf3b JE	103	mtd->size = size;
783ed81f	104	mtd->writesize = 1;
07be303d	105	mtd->writebufsize = 64; /* Mimic CFI NOR flashes */
c13cbf3b JE	106	mtd->erasesize = MTDRAM_ERASE_SIZE;
	107	mtd->priv = mapped_address;
	108
	109	mtd->owner = THIS_MODULE;
3c3c10bb AB	110	mtd->_erase = ram_erase;
	111	mtd->_point = ram_point;
	112	mtd->_unpoint = ram_unpoint;
	113	mtd->_get_unmapped_area = ram_get_unmapped_area;
	114	mtd->_read = ram_read;
	115	mtd->_write = ram_write;
c13cbf3b	116
ee0e87b1	117	if (mtd_device_register(mtd, NULL, 0))
c13cbf3b	118	return -EIO;
c13cbf3b JE	119
c13cbf3b JE	120	return 0;
1da177e4	121	}
1da177e4 LT	122
	123	static int __init init_mtdram(void)
	124	{
c13cbf3b JE	125	void *addr;
	126	int err;
	127
	128	if (!total_size)
	129	return -EINVAL;
	130
	131	/* Allocate some memory */
	132	mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
	133	if (!mtd_info)
	134	return -ENOMEM;
	135
	136	addr = vmalloc(MTDRAM_TOTAL_SIZE);
	137	if (!addr) {
	138	kfree(mtd_info);
	139	mtd_info = NULL;
	140	return -ENOMEM;
	141	}
	142	err = mtdram_init_device(mtd_info, addr, MTDRAM_TOTAL_SIZE, "mtdram test device");
	143	if (err) {
	144	vfree(addr);
	145	kfree(mtd_info);
	146	mtd_info = NULL;
	147	return err;
	148	}
	149	memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
	150	return err;
1da177e4	151	}
1da177e4 LT	152
	153	module_init(init_mtdram);
	154	module_exit(cleanup_mtdram);
	155
	156	MODULE_LICENSE("GPL");
	157	MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>");
	158	MODULE_DESCRIPTION("Simulated MTD driver for testing");