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/* * carl9170 firmware - used by the ar9170 wireless device * * Clock, Timer & Timing * * Copyright (c) 2000-2005 ZyDAS Technology Corporation * Copyright (c) 2007-2009 Atheros Communications, Inc. * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> * Copyright 2009-2011 Christian Lamparter <chunkeey@googlemail.com> * * This program 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. * * This program 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 this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef __CARL9170FW_TIMER_H #define __CARL9170FW_TIMER_H #include "config.h" enum cpu_clock_t { AHB_40MHZ_OSC = 0, AHB_20_22MHZ = 1, AHB_40_44MHZ = 2, AHB_80_88MHZ = 3 }; static inline __inline uint32_t get_clock_counter(void) { return (get(AR9170_TIMER_REG_CLOCK_HIGH) << 16) | get(AR9170_TIMER_REG_CLOCK_LOW); } /* * works only up to 97 secs [44 MHz] or 107 secs for 40 MHz * Also, the delay wait will be affected by 2.4GHz<->5GHz * band changes. */ static inline __inline bool is_after_msecs(const uint32_t t0, const uint32_t msecs) { return ((get_clock_counter() - t0) / 1000) > (msecs * fw.ticks_per_usec); } /* * Note: Be careful with [u]delay. They won't service the * hardware watchdog timer. It might trigger if you * wait long enough. Also they don't terminate if sec is * above 97 sec [44MHz] or more than 107 sec [40MHz]. */ static inline __inline void delay(const uint32_t msec) { uint32_t t1, t2, dt, wt; wt = msec * fw.ticks_per_usec; t1 = get_clock_counter(); while (1) { t2 = get_clock_counter(); dt = (t2 - t1) / 1000; if (dt >= wt) break; } } static inline __inline void udelay(const uint32_t usec) { uint32_t t1, t2, dt; t1 = get_clock_counter(); while (1) { t2 = get_clock_counter(); dt = (t2 - t1); if (dt >= (usec * fw.ticks_per_usec)) break; } } void clock_set(enum cpu_clock_t _clock, bool on); #endif /* __CARL9170FW_TIMER_H */