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