android_kernel_motorola_sm6225/drivers/char/hw_random/ixp4xx-rng.c
Michael Buesch 56fb5fe9f1 [PATCH] Fix HWRNG built-in initcalls priority
This changes all HWRNG driver initcalls to module_init().  We must probe
the RNGs after the major kernel subsystems are already up and running (like
PCI).

This fixes Bug 7730.
http://bugzilla.kernel.org/show_bug.cgi?id=7730

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Cc: Jan Beulich <jbeulich@novell.com>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2007-01-11 18:18:21 -08:00

72 lines
1.6 KiB
C

/*
* 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 <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);
}
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");