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/*
* drivers/net/ubi32-eth.c
* Ubicom32 hardware random number generator driver.
*
* (C) Copyright 2009, Ubicom, Inc.
*
* This file is part of the Ubicom32 Linux Kernel Port.
*
* The Ubicom32 Linux Kernel Port is free software: you can redistribute
* it and/or modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, either version 2 of the
* License, or (at your option) any later version.
*
* The Ubicom32 Linux Kernel Port is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the Ubicom32 Linux Kernel Port. If not,
* see <http://www.gnu.org/licenses/>.
*
* Ubicom32 implementation derived from (with many thanks):
* arch/m68knommu
* arch/blackfin
* arch/parisc
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/hw_random.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/ip5000.h>
#define MODULE_NAME "ubicom32_rng"
static int ubicom32_rng_data_present(struct hwrng *rng, int wait)
{
int data, i;
for (i = 0; i < 20; i++) {
data = *(int *)(TIMER_BASE + TIMER_TRN);
if (data || !wait)
break;
udelay(10);
}
return data;
}
static int ubicom32_rng_data_read(struct hwrng *rng, u32 *data)
{
*data = *(int *)(TIMER_BASE + TIMER_TRN);
return 4;
}
static int ubicom32_rng_init(struct hwrng *rng)
{
printk(KERN_INFO "ubicom32 rng init\n");
*(int *)(TIMER_BASE + TIMER_TRN_CFG) = TIMER_TRN_CFG_ENABLE_OSC;
return 0;
}
static void ubicom32_rng_cleanup(struct hwrng *rng)
{
printk(KERN_INFO "ubicom32 rng cleanup\n");
*(int *)(TIMER_BASE + TIMER_TRN_CFG) = 0;
}
static struct hwrng ubicom32_rng = {
.name = MODULE_NAME,
.init = ubicom32_rng_init,
.cleanup = ubicom32_rng_cleanup,
.data_present = ubicom32_rng_data_present,
.data_read = ubicom32_rng_data_read,
.priv = 0,
};
static int __init mod_init(void)
{
int err;
printk(KERN_INFO "ubicom32 rng started\n");
err = hwrng_register(&ubicom32_rng);
if (err) {
printk(KERN_ERR "ubicom32 rng register failed (%d)\n",
err);
}
return err;
}
static void __exit mod_exit(void)
{
printk(KERN_INFO "ubicom32 rng stopped\n");
hwrng_unregister(&ubicom32_rng);
}
module_init(mod_init);
module_exit(mod_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ubicom, Inc.");
MODULE_DESCRIPTION("H/W rng driver for ubicom32 processor");
MODULE_VERSION("1:1.0.a");
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