You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
164 lines
3.5 KiB
164 lines
3.5 KiB
/*
|
|
* 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");
|
|
|