60 lines
2.3 KiB
C
60 lines
2.3 KiB
C
/*
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*
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* Copyright 2016 Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <assert.h>
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#include <libpayload.h>
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uint64_t timer_hz(void)
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{
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/* libc/time.c currently requires all timers to be at least 1MHz. */
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assert(CONFIG_LP_TIMER_GENERIC_HZ >= 1000000);
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return CONFIG_LP_TIMER_GENERIC_HZ;
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}
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uint64_t timer_raw_value(void)
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{
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uint64_t cur_tick;
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uint32_t count_h;
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uint32_t count_l;
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if (!CONFIG_LP_TIMER_GENERIC_HIGH_REG)
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return readl(phys_to_virt(CONFIG_LP_TIMER_GENERIC_REG));
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do {
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count_h = readl(phys_to_virt(CONFIG_LP_TIMER_GENERIC_HIGH_REG));
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count_l = readl(phys_to_virt(CONFIG_LP_TIMER_GENERIC_REG));
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cur_tick = readl(phys_to_virt(CONFIG_LP_TIMER_GENERIC_HIGH_REG));
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} while (cur_tick != count_h);
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return (cur_tick << 32) + count_l;
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}
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