[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/compatmac.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)
{
	if (instr->addr + instr->len > mtd->size)
		return -EINVAL;

	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)
{
	if (from + len > mtd->size)
		return -EINVAL;

	/* can we return a physical address with this driver? */
	if (phys)
		return -EINVAL;

	*virt = mtd->priv + from;
	*retlen = len;
	return 0;
}

static void ram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
{
}

static int ram_read(struct mtd_info *mtd, loff_t from, size_t len,
		size_t *retlen, u_char *buf)
{
	if (from + len > mtd->size)
		return -EINVAL;

	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)
{
	if (to + len > mtd->size)
		return -EINVAL;

	memcpy((char *)mtd->priv + to, buf, len);

	*retlen = len;
	return 0;
}

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

int mtdram_init_device(struct mtd_info *mtd, void *mapped_address,
		unsigned long size, 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->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->read = ram_read;
	mtd->write = ram_write;

	if (add_mtd_device(mtd)) {
		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>
	17	#include <linux/mtd/compatmac.h>
	18	#include <linux/mtd/mtd.h>
456d9fc9	19	#include <linux/mtd/mtdram.h>
1da177e4	20
1da177e4 LT	21	static unsigned long total_size = CONFIG_MTDRAM_TOTAL_SIZE;
1da177e4 LT	22	static unsigned long erase_size = CONFIG_MTDRAM_ERASE_SIZE;
1da177e4 LT	23	#define MTDRAM_TOTAL_SIZE (total_size * 1024)
1da177e4 LT	24	#define MTDRAM_ERASE_SIZE (erase_size * 1024)
1da177e4	25
c13cbf3b JE	26	#ifdef MODULE
	27	module_param(total_size, ulong, 0);
	28	MODULE_PARM_DESC(total_size, "Total device size in KiB");
	29	module_param(erase_size, ulong, 0);
	30	MODULE_PARM_DESC(erase_size, "Device erase block size in KiB");
	31	#endif
1da177e4 LT	32
	33	// We could store these in the mtd structure, but we only support 1 device..
	34	static struct mtd_info *mtd_info;
	35
c13cbf3b	36	static int ram_erase(struct mtd_info mtd, struct erase_info instr)
1da177e4	37	{
c13cbf3b JE	38	if (instr->addr + instr->len > mtd->size)
	39	return -EINVAL;
	40
	41	memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
	42
	43	instr->state = MTD_ERASE_DONE;
	44	mtd_erase_callback(instr);
	45
	46	return 0;
1da177e4 LT	47	}
1da177e4 LT	48
c13cbf3b	49	static int ram_point(struct mtd_info *mtd, loff_t from, size_t len,
a98889f3	50	size_t retlen, void virt, resource_size_t phys)
1da177e4	51	{
c13cbf3b JE	52	if (from + len > mtd->size)
	53	return -EINVAL;
	54
a98889f3 JH	55	/* can we return a physical address with this driver? */
	56	if (phys)
	57	return -EINVAL;
	58
	59	*virt = mtd->priv + from;
c13cbf3b JE	60	*retlen = len;
c13cbf3b JE	61	return 0;
1da177e4 LT	62	}
1da177e4 LT	63
a98889f3	64	static void ram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
1da177e4	65	{
1da177e4 LT	66	}
	67
	68	static int ram_read(struct mtd_info *mtd, loff_t from, size_t len,
c13cbf3b	69	size_t retlen, u_char buf)
1da177e4	70	{
c13cbf3b JE	71	if (from + len > mtd->size)
c13cbf3b JE	72	return -EINVAL;
1da177e4	73
c13cbf3b	74	memcpy(buf, mtd->priv + from, len);
1da177e4	75
c13cbf3b JE	76	*retlen = len;
c13cbf3b JE	77	return 0;
1da177e4 LT	78	}
	79
	80	static int ram_write(struct mtd_info *mtd, loff_t to, size_t len,
c13cbf3b	81	size_t retlen, const u_char buf)
1da177e4	82	{
c13cbf3b JE	83	if (to + len > mtd->size)
c13cbf3b JE	84	return -EINVAL;
1da177e4	85
c13cbf3b	86	memcpy((char *)mtd->priv + to, buf, len);
1da177e4	87
c13cbf3b JE	88	*retlen = len;
c13cbf3b JE	89	return 0;
1da177e4 LT	90	}
	91
	92	static void __exit cleanup_mtdram(void)
	93	{
c13cbf3b JE	94	if (mtd_info) {
c13cbf3b JE	95	del_mtd_device(mtd_info);
f9101210	96	vfree(mtd_info->priv);
c13cbf3b JE	97	kfree(mtd_info);
c13cbf3b JE	98	}
1da177e4 LT	99	}
1da177e4 LT	100
c13cbf3b JE	101	int mtdram_init_device(struct mtd_info mtd, void mapped_address,
c13cbf3b JE	102	unsigned long size, char *name)
1da177e4	103	{
c13cbf3b JE	104	memset(mtd, 0, sizeof(*mtd));
	105
	106	/* Setup the MTD structure */
	107	mtd->name = name;
21c8db9e	108	mtd->type = MTD_RAM;
c13cbf3b JE	109	mtd->flags = MTD_CAP_RAM;
c13cbf3b JE	110	mtd->size = size;
783ed81f	111	mtd->writesize = 1;
c13cbf3b JE	112	mtd->erasesize = MTDRAM_ERASE_SIZE;
	113	mtd->priv = mapped_address;
	114
	115	mtd->owner = THIS_MODULE;
	116	mtd->erase = ram_erase;
	117	mtd->point = ram_point;
	118	mtd->unpoint = ram_unpoint;
	119	mtd->read = ram_read;
	120	mtd->write = ram_write;
	121
	122	if (add_mtd_device(mtd)) {
	123	return -EIO;
	124	}
	125
	126	return 0;
1da177e4	127	}
1da177e4 LT	128
	129	static int __init init_mtdram(void)
	130	{
c13cbf3b JE	131	void *addr;
	132	int err;
	133
	134	if (!total_size)
	135	return -EINVAL;
	136
	137	/* Allocate some memory */
	138	mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
	139	if (!mtd_info)
	140	return -ENOMEM;
	141
	142	addr = vmalloc(MTDRAM_TOTAL_SIZE);
	143	if (!addr) {
	144	kfree(mtd_info);
	145	mtd_info = NULL;
	146	return -ENOMEM;
	147	}
	148	err = mtdram_init_device(mtd_info, addr, MTDRAM_TOTAL_SIZE, "mtdram test device");
	149	if (err) {
	150	vfree(addr);
	151	kfree(mtd_info);
	152	mtd_info = NULL;
	153	return err;
	154	}
	155	memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
	156	return err;
1da177e4	157	}
1da177e4 LT	158
	159	module_init(init_mtdram);
	160	module_exit(cleanup_mtdram);
	161
	162	MODULE_LICENSE("GPL");
	163	MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>");
	164	MODULE_DESCRIPTION("Simulated MTD driver for testing");