| 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 | |
| 30 | spinlock_t crypto_ubicom32_lock; |
| 31 | bool crypto_ubicom32_inited = false; |
| 32 | volatile bool crypto_ubicom32_on = false; |
| 33 | volatile unsigned long crypto_ubicom32_last_use; |
| 34 | |
| 35 | struct timer_list crypto_ubicom32_ps_timer; |
| 36 | void 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 | |
