[mirror_ubuntu-artful-kernel.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)
{
	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 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)
{
	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) {
		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, 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 JE	37	if (instr->addr + instr->len > mtd->size)
	38	return -EINVAL;
	39
	40	memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
	41
	42	instr->state = MTD_ERASE_DONE;
	43	mtd_erase_callback(instr);
	44
	45	return 0;
1da177e4 LT	46	}
1da177e4 LT	47
c13cbf3b	48	static int ram_point(struct mtd_info *mtd, loff_t from, size_t len,
a98889f3	49	size_t retlen, void virt, resource_size_t phys)
1da177e4	50	{
c13cbf3b JE	51	if (from + len > mtd->size)
	52	return -EINVAL;
	53
a98889f3 JH	54	/* can we return a physical address with this driver? */
	55	if (phys)
	56	return -EINVAL;
	57
	58	*virt = mtd->priv + from;
c13cbf3b JE	59	*retlen = len;
c13cbf3b JE	60	return 0;
1da177e4 LT	61	}
1da177e4 LT	62
5e4e6e3f	63	static int ram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
1da177e4	64	{
5e4e6e3f	65	return 0;
1da177e4 LT	66	}
1da177e4 LT	67
402d3265 DH	68	/*
	69	* Allow NOMMU mmap() to directly map the device (if not NULL)
	70	* - return the address to which the offset maps
	71	* - return -ENOSYS to indicate refusal to do the mapping
	72	*/
	73	static unsigned long ram_get_unmapped_area(struct mtd_info *mtd,
	74	unsigned long len,
	75	unsigned long offset,
	76	unsigned long flags)
	77	{
	78	return (unsigned long) mtd->priv + offset;
	79	}
	80
1da177e4	81	static int ram_read(struct mtd_info *mtd, loff_t from, size_t len,
c13cbf3b	82	size_t retlen, u_char buf)
1da177e4	83	{
c13cbf3b JE	84	if (from + len > mtd->size)
c13cbf3b JE	85	return -EINVAL;
1da177e4	86
c13cbf3b	87	memcpy(buf, mtd->priv + from, len);
1da177e4	88
c13cbf3b JE	89	*retlen = len;
c13cbf3b JE	90	return 0;
1da177e4 LT	91	}
	92
	93	static int ram_write(struct mtd_info *mtd, loff_t to, size_t len,
c13cbf3b	94	size_t retlen, const u_char buf)
1da177e4	95	{
c13cbf3b JE	96	if (to + len > mtd->size)
c13cbf3b JE	97	return -EINVAL;
1da177e4	98
c13cbf3b	99	memcpy((char *)mtd->priv + to, buf, len);
1da177e4	100
c13cbf3b JE	101	*retlen = len;
c13cbf3b JE	102	return 0;
1da177e4 LT	103	}
	104
	105	static void __exit cleanup_mtdram(void)
	106	{
c13cbf3b	107	if (mtd_info) {
ee0e87b1	108	mtd_device_unregister(mtd_info);
f9101210	109	vfree(mtd_info->priv);
c13cbf3b JE	110	kfree(mtd_info);
c13cbf3b JE	111	}
1da177e4 LT	112	}
1da177e4 LT	113
c13cbf3b JE	114	int mtdram_init_device(struct mtd_info mtd, void mapped_address,
c13cbf3b JE	115	unsigned long size, char *name)
1da177e4	116	{
c13cbf3b JE	117	memset(mtd, 0, sizeof(*mtd));
	118
	119	/* Setup the MTD structure */
	120	mtd->name = name;
21c8db9e	121	mtd->type = MTD_RAM;
c13cbf3b JE	122	mtd->flags = MTD_CAP_RAM;
c13cbf3b JE	123	mtd->size = size;
783ed81f	124	mtd->writesize = 1;
07be303d	125	mtd->writebufsize = 64; /* Mimic CFI NOR flashes */
c13cbf3b JE	126	mtd->erasesize = MTDRAM_ERASE_SIZE;
	127	mtd->priv = mapped_address;
	128
	129	mtd->owner = THIS_MODULE;
3c3c10bb AB	130	mtd->_erase = ram_erase;
	131	mtd->_point = ram_point;
	132	mtd->_unpoint = ram_unpoint;
	133	mtd->_get_unmapped_area = ram_get_unmapped_area;
	134	mtd->_read = ram_read;
	135	mtd->_write = ram_write;
c13cbf3b	136
ee0e87b1	137	if (mtd_device_register(mtd, NULL, 0))
c13cbf3b	138	return -EIO;
c13cbf3b JE	139
c13cbf3b JE	140	return 0;
1da177e4	141	}
1da177e4 LT	142
	143	static int __init init_mtdram(void)
	144	{
c13cbf3b JE	145	void *addr;
	146	int err;
	147
	148	if (!total_size)
	149	return -EINVAL;
	150
	151	/* Allocate some memory */
	152	mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
	153	if (!mtd_info)
	154	return -ENOMEM;
	155
	156	addr = vmalloc(MTDRAM_TOTAL_SIZE);
	157	if (!addr) {
	158	kfree(mtd_info);
	159	mtd_info = NULL;
	160	return -ENOMEM;
	161	}
	162	err = mtdram_init_device(mtd_info, addr, MTDRAM_TOTAL_SIZE, "mtdram test device");
	163	if (err) {
	164	vfree(addr);
	165	kfree(mtd_info);
	166	mtd_info = NULL;
	167	return err;
	168	}
	169	memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
	170	return err;
1da177e4	171	}
1da177e4 LT	172
	173	module_init(init_mtdram);
	174	module_exit(cleanup_mtdram);
	175
	176	MODULE_LICENSE("GPL");
	177	MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>");
	178	MODULE_DESCRIPTION("Simulated MTD driver for testing");