1/*
2 * arch/ubicom32/crypto/crypto_ubicom32.c
3 *   Generic code to support ubicom32 hardware crypto accelerator
4 *
5 * (C) Copyright 2009, Ubicom, Inc.
6 *
7 * This file is part of the Ubicom32 Linux Kernel Port.
8 *
9 * The Ubicom32 Linux Kernel Port is free software: you can redistribute
10 * it and/or modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation, either version 2 of the
12 * License, or (at your option) any later version.
13 *
14 * The Ubicom32 Linux Kernel Port is distributed in the hope that it
15 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
16 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
17 * the GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with the Ubicom32 Linux Kernel Port.  If not,
21 * see <http://www.gnu.org/licenses/>.
22 *
23 * Ubicom32 implementation derived from (with many thanks):
24 *   arch/m68knommu
25 *   arch/blackfin
26 *   arch/parisc
27 */
28#include "crypto_ubicom32.h"
29
30spinlock_t crypto_ubicom32_lock;
31bool crypto_ubicom32_inited = false;
32volatile bool crypto_ubicom32_on = false;
33volatile unsigned long crypto_ubicom32_last_use;
34
35struct timer_list crypto_ubicom32_ps_timer;
36void crypto_ubicom32_ps_check(unsigned long data)
37{
38	unsigned long idle_time = msecs_to_jiffies(HW_CRYPTO_PS_MAX_IDLE_MS);
39
40	BUG_ON(!crypto_ubicom32_on);
41
42	if (((jiffies - crypto_ubicom32_last_use) > idle_time) && spin_trylock_bh(&crypto_ubicom32_lock)) {
43                hw_crypto_turn_off();
44                spin_unlock_bh(&crypto_ubicom32_lock);
45		return;
46	}
47
48	/* keep monitoring */
49	hw_crypto_ps_start();
50}
51