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/*
* Copyright (c) 2011 - 2014 The Linux Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of The Linux Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 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 <device/mmio.h>
#include <delay.h>
#include <soc/iomap.h>
#include <soc/ipq_timer.h>
#include <timer.h>
#define GCNT_FREQ_MHZ 48
#define TIMER_TICKS(us) (GCNT_FREQ_MHZ * (us))
#define TIMER_USECS(ticks) ((ticks) / GCNT_FREQ_MHZ)
/**
* init_timer - initialize timer
*/
void init_timer(void)
{
/* disable timer */
write32(GCNT_CNTCR, 0);
/* Reset the counters to zero */
write32(GCNT_GLB_CNTCV_LO, 0);
write32(GCNT_GLB_CNTCV_HI, 0);
/* Enable timer */
write32(GCNT_CNTCR, 1);
}
static inline uint64_t read_gcnt_val(void)
{
uint32_t hi, lo;
do {
hi = read32(GCNT_CNTCV_HI);
lo = read32(GCNT_CNTCV_LO);
} while (hi != read32(GCNT_CNTCV_HI));
return ((((uint64_t)hi) << 32) | lo);
}
/**
* udelay - generates micro second delay.
* @param usec: delay duration in microseconds
*/
void udelay(unsigned usec)
{
uint64_t expire;
expire = read_gcnt_val() + TIMER_TICKS(usec);
while (expire >= read_gcnt_val())
;
}
void timer_monotonic_get(struct mono_time *mt)
{
mono_time_set_usecs(mt, TIMER_USECS(read_gcnt_val()));
}
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