/* * 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; 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 Random Number Generator (RNG) driver for IXP4xx"); MODULE_LICENSE("GPL");