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