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