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