Release 4.15 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/mm.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;

static unsigned long writebuf_size = 64;

#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");
module_param(writebuf_size, ulong, 0);
MODULE_PARM_DESC(writebuf_size, "Device write buf size in Bytes (Default: 64)");
#endif

// We could store these in the mtd structure, but we only support 1 device..

static struct mtd_info *mtd_info;



static int check_offs_len(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
	int ret = 0;

	/* Start address must align on block boundary */
	if (mtd_mod_by_eb(ofs, mtd)) {
		pr_debug("%s: unaligned address\n", __func__);
		ret = -EINVAL;
	}

	/* Length must align on block boundary */
	if (mtd_mod_by_eb(len, mtd)) {
		pr_debug("%s: length not block aligned\n", __func__);
		ret = -EINVAL;
	}

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dongsheng Yang
73
100.00%
1
100.00%
Total
73
100.00%
1
100.00%



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
48
68.57%
1
33.33%
Dongsheng Yang
19
27.14%
1
33.33%
David Woodhouse
3
4.29%
1
33.33%
Total
70
100.00%
3
100.00%



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;

	if (phys) {
		/* limit retlen to the number of contiguous physical pages */
		unsigned long page_ofs = offset_in_page(*virt);
		void *addr = *virt - page_ofs;
		unsigned long pfn1, pfn0 = vmalloc_to_pfn(addr);

		*phys = __pfn_to_phys(pfn0) + page_ofs;
		len += page_ofs;
		while (len > PAGE_SIZE) {
			len -= PAGE_SIZE;
			addr += PAGE_SIZE;
			pfn0++;
			pfn1 = vmalloc_to_pfn(addr);
			if (pfn1 != pfn0) {
				*retlen = addr - *virt;
				break;
			}
		}
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nico Pitre
94
66.67%
1
33.33%
Linus Torvalds (pre-git)
40
28.37%
1
33.33%
Jared Hulbert
7
4.96%
1
33.33%
Total
141
100.00%
3
100.00%



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
9
45.00%
1
33.33%
Artem B. Bityutskiy
6
30.00%
1
33.33%
David Woodhouse
5
25.00%
1
33.33%
Total
20
100.00%
3
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
46
100.00%
1
100.00%
Total
46
100.00%
1
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
51
100.00%
1
100.00%
Total
51
100.00%
1
100.00%



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
28
87.50%
1
33.33%
Linus Torvalds
3
9.38%
1
33.33%
Jamie Iles
1
3.12%
1
33.33%
Total
32
100.00%
3
100.00%



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 = writebuf_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 (mtd_device_register(mtd, NULL, 0))
		return -EIO;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Woodhouse
78
56.12%
2
20.00%
Linus Torvalds (pre-git)
37
26.62%
1
10.00%
Artem B. Bityutskiy
16
11.51%
3
30.00%
Jamie Iles
5
3.60%
1
10.00%
Alexander Stein
1
0.72%
1
10.00%
Linus Torvalds
1
0.72%
1
10.00%
Brian Norris
1
0.72%
1
10.00%
Total
139
100.00%
10
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Woodhouse
86
68.80%
2
40.00%
Linus Torvalds (pre-git)
33
26.40%
1
20.00%
Linus Torvalds
4
3.20%
1
20.00%
Jörn Engel
2
1.60%
1
20.00%
Total
125
100.00%
5
100.00%


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");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
320
38.28%
1
4.55%
David Woodhouse
192
22.97%
4
18.18%
Nico Pitre
97
11.60%
1
4.55%
Dongsheng Yang
92
11.00%
1
4.55%
Linus Torvalds
50
5.98%
3
13.64%
Alexander Stein
24
2.87%
1
4.55%
Artem B. Bityutskiy
22
2.63%
4
18.18%
Jörn Engel
13
1.56%
1
4.55%
Andrew Morton
8
0.96%
1
4.55%
Jared Hulbert
7
0.84%
1
4.55%
Jamie Iles
6
0.72%
1
4.55%
Adrian Bunk
4
0.48%
2
9.09%
Brian Norris
1
0.12%
1
4.55%
Total
836
100.00%
22
100.00%
Directory: drivers/mtd/devices

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.