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Commit d7174bcb authored by Michael Buesch's avatar Michael Buesch Committed by Linus Torvalds
Browse files

[PATCH] Add ixp4xx HW RNG driver 



Signed-off-by: default avatarMichael Buesch <mb@bu3sch.de>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 13523363

drivers/char/hw_random/Kconfig

+13 −0
Original line number Diff line number Diff line
@@ -61,3 +61,16 @@ config HW_RANDOM_VIA 
	  module will be called via-rng.



	  If unsure, say Y.



config HW_RANDOM_IXP4XX

	tristate "Intel IXP4xx NPU HW Random Number Generator support"

	depends on HW_RANDOM && ARCH_IXP4XX

	default y

	---help---

	  This driver provides kernel-side support for the Random

	  Number Generator hardware found on the Intel IXP4xx NPU.



	  To compile this driver as a module, choose M here: the

	  module will be called ixp4xx-rng.



	  If unsure, say Y.

drivers/char/hw_random/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -7,3 +7,4 @@ obj-$(CONFIG_HW_RANDOM_INTEL) += intel-rng.o 
obj-$(CONFIG_HW_RANDOM_AMD) += amd-rng.o

obj-$(CONFIG_HW_RANDOM_GEODE) += geode-rng.o

obj-$(CONFIG_HW_RANDOM_VIA) += via-rng.o

obj-$(CONFIG_HW_RANDOM_IXP4XX) += ixp4xx-rng.o

drivers/char/hw_random/ixp4xx-rng.c

0 → 100644
+73 −0
Original line number Diff line number Diff line 
/*

 * drivers/char/rng/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/config.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 <asm/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;



	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);

}



subsys_initcall(ixp4xx_rng_init);

module_exit(ixp4xx_rng_exit);



MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");

MODULE_DESCRIPTION("H/W Random Number Generator (RNG) driver for IXP4xx");

MODULE_LICENSE("GPL");