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/*======================================================================
$Id: slram.c,v 1.10 2000/07/03 10:01:38 dwmw2 Exp $
======================================================================*/
#include <linux/module.h>
#include <asm/uaccess.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/major.h>
#include <linux/fs.h>
#include <linux/ioctl.h>
#include <linux/init.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/segment.h>
#include <stdarg.h>
#include <linux/mtd/mtd.h>
struct mypriv {
u_char *start;
u_char *end;
};
int physmem_erase (struct mtd_info *mtd, struct erase_info *instr);
int physmem_point (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf);
void physmem_unpoint (struct mtd_info *mtd, u_char *addr);
int physmem_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
int physmem_write (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
int physmem_erase (struct mtd_info *mtd, struct erase_info *instr)
{
struct mypriv *priv = mtd->priv;
if (instr->addr + instr->len > mtd->size)
return -EINVAL;
memset(priv->start + instr->addr, 0xff, instr->len);
/* This'll catch a few races. Free the thing before returning :)
* I don't feel at all ashamed. This kind of thing is possible anyway
* with flash, but unlikely.
*/
instr->state = MTD_ERASE_DONE;
if (instr->callback)
(*(instr->callback))(instr);
else
kfree(instr);
return 0;
}
int physmem_point (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf)
{
struct mypriv *priv = (struct mypriv *)mtd->priv;
*mtdbuf = priv->start + from;
*retlen = len;
return 0;
}
void physmem_unpoint (struct mtd_info *mtd, u_char *addr)
{
}
int physmem_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
{
struct mypriv *priv = (struct mypriv *)mtd->priv;
memcpy (buf, priv->start + from, len);
*retlen=len;
return 0;
}
int physmem_write (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
{
struct mypriv *priv = (struct mypriv *)mtd->priv;
memcpy (priv->start + to, buf, len);
*retlen=len;
return 0;
}
/*====================================================================*/
/* Place your defaults here */
static u_long start = 100663296;
static u_long length = 33554432;
static u_long end = 0;
#if LINUX_VERSION_CODE < 0x20300
#ifdef MODULE
#define init_slram init_module
#define cleanup_slram cleanup_module
#endif
#define __exit
#endif
#ifdef MODULE
MODULE_PARM(start,"l");
MODULE_PARM(length,"l");
MODULE_PARM(end,"l");
#endif
struct mtd_info *mymtd;
void __init mtd_slram_setup(char *str, int *ints)
{
if (ints[0] > 0)
start=ints[1];
if (ints[0] > 1)
length=ints[2];
}
int init_slram(void)
{
if (!start)
{
printk(KERN_NOTICE "physmem: No start address for memory device.\n");
return -EINVAL;
}
if (!length && !end)
{
printk(KERN_NOTICE "physmem: No length or endpointer given.\n");
return -EINVAL;
}
if (!end)
end = start + length;
if (!length)
length = end - start;
if (start + length != end)
{
printk(KERN_NOTICE "physmem: start(%lx) + length(%lx) != end(%lx) !\n",
start, length, end);
return -EINVAL;
}
mymtd = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
memset(mymtd, 0, sizeof(*mymtd));
if (mymtd)
{
memset((char *)mymtd, 0, sizeof(struct mtd_info));
mymtd->priv = (void *) kmalloc (sizeof(struct mypriv), GFP_KERNEL);
if (!mymtd->priv)
{
kfree(mymtd);
mymtd = NULL;
}
memset(mymtd->priv, 0, sizeof(struct mypriv));
}
if (!mymtd)
{
printk(KERN_NOTICE "physmem: Cannot allocate new MTD device.\n");
return -ENOMEM;
}
((struct mypriv *)mymtd->priv)->start = ioremap(start, length);
((struct mypriv *)mymtd->priv)->end = ((struct mypriv *)mymtd->priv)->start + length;
mymtd->name = "Raw memory";
mymtd->size = length;
mymtd->flags = MTD_CLEAR_BITS | MTD_SET_BITS | MTD_WRITEB_WRITEABLE | MTD_VOLATILE;
mymtd->erase = physmem_erase;
mymtd->point = physmem_point;
mymtd->unpoint = physmem_unpoint;
mymtd->read = physmem_read;
mymtd->write = physmem_write;
mymtd->module = THIS_MODULE;
mymtd->type = MTD_RAM;
mymtd->erasesize = 0x10000;
if (add_mtd_device(mymtd))
{
printk("Failed to register new device\n");
iounmap(((struct mypriv *)mymtd->priv)->start);
kfree(mymtd->priv);
kfree(mymtd);
return -EAGAIN;
}
printk("Registered physmem device from %dKb to %dKb\n",
(int)(start / 1024), (int)(end / 1024));
printk("Mapped from 0x%p to 0x%p\n",((struct mypriv *)mymtd->priv)->start,
((struct mypriv *)mymtd->priv)->end);
return 0;
}
static void __exit cleanup_slram(void)
{
iounmap(((struct mypriv *)mymtd->priv)->start);
kfree (mymtd->priv);
del_mtd_device(mymtd);
kfree(mymtd);
}
#if LINUX_VERSION_CODE > 0x20300
module_init(init_slram);
module_exit(cleanup_slram);
#endif
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