[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / mtd / devices / mtdram.c

/*
 * mtdram - a test mtd device
 * $Id: mtdram.c,v 1.37 2005/04/21 03:42:11 joern Exp $
 * 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/config.h>
#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>

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, u_char **mtdbuf)
{
	if (from + len > mtd->size)
		return -EINVAL;

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

static void ram_unpoint(struct mtd_info *mtd, u_char * addr, 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->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
c13cbf3b	3	* $Id: mtdram.c,v 1.37 2005/04/21 03:42:11 joern Exp $
1da177e4 LT	4	* Author: Alexander Larsson <alex@cendio.se>
	5	*
	6	* Copyright (c) 1999 Alexander Larsson <alex@cendio.se>
c13cbf3b	7	* Copyright (c) 2005 Joern Engel <joern@wh.fh-wedel.de>
1da177e4 LT	8	*
	9	* This code is GPL
	10	*
	11	*/
	12
	13	#include <linux/config.h>
	14	#include <linux/module.h>
	15	#include <linux/slab.h>
	16	#include <linux/ioport.h>
	17	#include <linux/vmalloc.h>
	18	#include <linux/init.h>
	19	#include <linux/mtd/compatmac.h>
	20	#include <linux/mtd/mtd.h>
	21
1da177e4 LT	22	static unsigned long total_size = CONFIG_MTDRAM_TOTAL_SIZE;
1da177e4 LT	23	static unsigned long erase_size = CONFIG_MTDRAM_ERASE_SIZE;
1da177e4 LT	24	#define MTDRAM_TOTAL_SIZE (total_size * 1024)
1da177e4 LT	25	#define MTDRAM_ERASE_SIZE (erase_size * 1024)
1da177e4	26
c13cbf3b JE	27	#ifdef MODULE
	28	module_param(total_size, ulong, 0);
	29	MODULE_PARM_DESC(total_size, "Total device size in KiB");
	30	module_param(erase_size, ulong, 0);
	31	MODULE_PARM_DESC(erase_size, "Device erase block size in KiB");
	32	#endif
1da177e4 LT	33
	34	// We could store these in the mtd structure, but we only support 1 device..
	35	static struct mtd_info *mtd_info;
	36
c13cbf3b	37	static int ram_erase(struct mtd_info mtd, struct erase_info instr)
1da177e4	38	{
c13cbf3b JE	39	if (instr->addr + instr->len > mtd->size)
	40	return -EINVAL;
	41
	42	memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
	43
	44	instr->state = MTD_ERASE_DONE;
	45	mtd_erase_callback(instr);
	46
	47	return 0;
1da177e4 LT	48	}
1da177e4 LT	49
c13cbf3b JE	50	static int ram_point(struct mtd_info *mtd, loff_t from, size_t len,
c13cbf3b JE	51	size_t retlen, u_char *mtdbuf)
1da177e4	52	{
c13cbf3b JE	53	if (from + len > mtd->size)
	54	return -EINVAL;
	55
	56	*mtdbuf = mtd->priv + from;
	57	*retlen = len;
	58	return 0;
1da177e4 LT	59	}
1da177e4 LT	60
c13cbf3b JE	61	static void ram_unpoint(struct mtd_info mtd, u_char addr, loff_t from,
c13cbf3b JE	62	size_t len)
1da177e4	63	{
1da177e4 LT	64	}
	65
	66	static int ram_read(struct mtd_info *mtd, loff_t from, size_t len,
c13cbf3b	67	size_t retlen, u_char buf)
1da177e4	68	{
c13cbf3b JE	69	if (from + len > mtd->size)
c13cbf3b JE	70	return -EINVAL;
1da177e4	71
c13cbf3b	72	memcpy(buf, mtd->priv + from, len);
1da177e4	73
c13cbf3b JE	74	*retlen = len;
c13cbf3b JE	75	return 0;
1da177e4 LT	76	}
	77
	78	static int ram_write(struct mtd_info *mtd, loff_t to, size_t len,
c13cbf3b	79	size_t retlen, const u_char buf)
1da177e4	80	{
c13cbf3b JE	81	if (to + len > mtd->size)
c13cbf3b JE	82	return -EINVAL;
1da177e4	83
c13cbf3b	84	memcpy((char *)mtd->priv + to, buf, len);
1da177e4	85
c13cbf3b JE	86	*retlen = len;
c13cbf3b JE	87	return 0;
1da177e4 LT	88	}
	89
	90	static void __exit cleanup_mtdram(void)
	91	{
c13cbf3b JE	92	if (mtd_info) {
c13cbf3b JE	93	del_mtd_device(mtd_info);
f9101210	94	vfree(mtd_info->priv);
c13cbf3b JE	95	kfree(mtd_info);
c13cbf3b JE	96	}
1da177e4 LT	97	}
1da177e4 LT	98
c13cbf3b JE	99	int mtdram_init_device(struct mtd_info mtd, void mapped_address,
c13cbf3b JE	100	unsigned long size, char *name)
1da177e4	101	{
c13cbf3b JE	102	memset(mtd, 0, sizeof(*mtd));
	103
	104	/* Setup the MTD structure */
	105	mtd->name = name;
	106	mtd->type = MTD_RAM;
	107	mtd->flags = MTD_CAP_RAM;
	108	mtd->size = size;
	109	mtd->erasesize = MTDRAM_ERASE_SIZE;
	110	mtd->priv = mapped_address;
	111
	112	mtd->owner = THIS_MODULE;
	113	mtd->erase = ram_erase;
	114	mtd->point = ram_point;
	115	mtd->unpoint = ram_unpoint;
	116	mtd->read = ram_read;
	117	mtd->write = ram_write;
	118
	119	if (add_mtd_device(mtd)) {
	120	return -EIO;
	121	}
	122
	123	return 0;
1da177e4	124	}
1da177e4 LT	125
	126	static int __init init_mtdram(void)
	127	{
c13cbf3b JE	128	void *addr;
	129	int err;
	130
	131	if (!total_size)
	132	return -EINVAL;
	133
	134	/* Allocate some memory */
	135	mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
	136	if (!mtd_info)
	137	return -ENOMEM;
	138
	139	addr = vmalloc(MTDRAM_TOTAL_SIZE);
	140	if (!addr) {
	141	kfree(mtd_info);
	142	mtd_info = NULL;
	143	return -ENOMEM;
	144	}
	145	err = mtdram_init_device(mtd_info, addr, MTDRAM_TOTAL_SIZE, "mtdram test device");
	146	if (err) {
	147	vfree(addr);
	148	kfree(mtd_info);
	149	mtd_info = NULL;
	150	return err;
	151	}
	152	memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
	153	return err;
1da177e4	154	}
1da177e4 LT	155
	156	module_init(init_mtdram);
	157	module_exit(cleanup_mtdram);
	158
	159	MODULE_LICENSE("GPL");
	160	MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>");
	161	MODULE_DESCRIPTION("Simulated MTD driver for testing");