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