mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-14 16:32:49 +02:00
106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
|
/*
|
||
|
|
* 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");
|