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    Subject[patch 7/9] Add ixp4xx HW RNG driver
    Signed-off-by: Michael Buesch <mb@bu3sch.de>
    Index: hwrng/drivers/char/hw_random/Kconfig
    ===================================================================
    --- hwrng.orig/drivers/char/hw_random/Kconfig 2006-05-08 00:12:20.000000000 +0200
    +++ hwrng/drivers/char/hw_random/Kconfig 2006-05-08 00:15:58.000000000 +0200
    @@ -61,3 +61,16 @@
    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.
    Index: hwrng/drivers/char/hw_random/Makefile
    ===================================================================
    --- hwrng.orig/drivers/char/hw_random/Makefile 2006-05-08 00:12:12.000000000 +0200
    +++ hwrng/drivers/char/hw_random/Makefile 2006-05-08 00:15:42.000000000 +0200
    @@ -7,3 +7,4 @@
    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
    Index: hwrng/drivers/char/hw_random/ixp4xx-rng.c
    ===================================================================
    --- /dev/null 1970-01-01 00:00:00.000000000 +0000
    +++ hwrng/drivers/char/hw_random/ixp4xx-rng.c 2006-05-08 00:12:34.000000000 +0200
    @@ -0,0 +1,73 @@
    +/*
    + * 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");
    --

    -
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