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89 lines
2.4 KiB
89 lines
2.4 KiB
13 years ago
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/*
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* carl9170 firmware - used by the ar9170 wireless device
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*
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* Clock, Timer & Timing
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*
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* Copyright (c) 2000-2005 ZyDAS Technology Corporation
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* Copyright (c) 2007-2009 Atheros Communications, Inc.
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* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
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* Copyright 2009-2011 Christian Lamparter <chunkeey@googlemail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef __CARL9170FW_TIMER_H
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#define __CARL9170FW_TIMER_H
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#include "config.h"
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enum cpu_clock_t {
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AHB_40MHZ_OSC = 0,
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AHB_20_22MHZ = 1,
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AHB_40_44MHZ = 2,
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AHB_80_88MHZ = 3
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};
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static inline __inline uint32_t get_clock_counter(void)
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{
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return (get(AR9170_TIMER_REG_CLOCK_HIGH) << 16) | get(AR9170_TIMER_REG_CLOCK_LOW);
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}
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/*
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* works only up to 97 secs [44 MHz] or 107 secs for 40 MHz
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* Also, the delay wait will be affected by 2.4GHz<->5GHz
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* band changes.
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*/
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static inline __inline bool is_after_msecs(const uint32_t t0, const uint32_t msecs)
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{
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return ((get_clock_counter() - t0) / 1000) > (msecs * fw.ticks_per_usec);
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}
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/*
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* Note: Be careful with [u]delay. They won't service the
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* hardware watchdog timer. It might trigger if you
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* wait long enough. Also they don't terminate if sec is
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* above 97 sec [44MHz] or more than 107 sec [40MHz].
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*/
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static inline __inline void delay(const uint32_t msec)
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{
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uint32_t t1, t2, dt, wt;
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wt = msec * fw.ticks_per_usec;
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t1 = get_clock_counter();
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while (1) {
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t2 = get_clock_counter();
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dt = (t2 - t1) / 1000;
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if (dt >= wt)
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break;
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}
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}
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static inline __inline void udelay(const uint32_t usec)
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{
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uint32_t t1, t2, dt;
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t1 = get_clock_counter();
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while (1) {
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t2 = get_clock_counter();
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dt = (t2 - t1);
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if (dt >= (usec * fw.ticks_per_usec))
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break;
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}
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}
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void clock_set(enum cpu_clock_t _clock, bool on);
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#endif /* __CARL9170FW_TIMER_H */
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