76 lines
1.6 KiB
C
76 lines
1.6 KiB
C
/*
|
|
* drivers/char/hw_random/ixp4xx-rng.c
|
|
*
|
|
* RNG driver for Intel IXP4xx family of NPUs
|
|
*
|
|
* Author: Deepak Saxena <dsaxena@plexity.net>
|
|
*
|
|
* Copyright 2005 (c) MontaVista Software, Inc.
|
|
*
|
|
* Fixes by Michael Buesch
|
|
*
|
|
* This file is licensed under the terms of the GNU General Public
|
|
* License version 2. This program is licensed "as is" without any
|
|
* warranty of any kind, whether express or implied.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/init.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/hw_random.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <mach/hardware.h>
|
|
|
|
|
|
static int ixp4xx_rng_data_read(struct hwrng *rng, u32 *buffer)
|
|
{
|
|
void __iomem * rng_base = (void __iomem *)rng->priv;
|
|
|
|
*buffer = __raw_readl(rng_base);
|
|
|
|
return 4;
|
|
}
|
|
|
|
static struct hwrng ixp4xx_rng_ops = {
|
|
.name = "ixp4xx",
|
|
.data_read = ixp4xx_rng_data_read,
|
|
};
|
|
|
|
static int __init ixp4xx_rng_init(void)
|
|
{
|
|
void __iomem * rng_base;
|
|
int err;
|
|
|
|
if (!cpu_is_ixp46x()) /* includes IXP455 */
|
|
return -ENOSYS;
|
|
|
|
rng_base = ioremap(0x70002100, 4);
|
|
if (!rng_base)
|
|
return -ENOMEM;
|
|
ixp4xx_rng_ops.priv = (unsigned long)rng_base;
|
|
err = hwrng_register(&ixp4xx_rng_ops);
|
|
if (err)
|
|
iounmap(rng_base);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __exit ixp4xx_rng_exit(void)
|
|
{
|
|
void __iomem * rng_base = (void __iomem *)ixp4xx_rng_ops.priv;
|
|
|
|
hwrng_unregister(&ixp4xx_rng_ops);
|
|
iounmap(rng_base);
|
|
}
|
|
|
|
module_init(ixp4xx_rng_init);
|
|
module_exit(ixp4xx_rng_exit);
|
|
|
|
MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
|
|
MODULE_DESCRIPTION("H/W Pseudo-Random Number Generator (RNG) driver for IXP45x/46x");
|
|
MODULE_LICENSE("GPL");
|