ixp4xx-rng.c
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/*
* 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");