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/*
* Copyright (c) 2012 - 2013 The Linux Foundation. All rights reserved.
* Source : APQ8064 LK boot
*
* Copyright (c) 2011-2012, Code Aurora Forum. 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 Google, Inc. 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 BY THE COPYRIGHT HOLDERS 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
* 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 <delay.h>
#include <iomap.h>
#include <ipq_timer.h>
#include <timer.h>
#define GPT_FREQ_KHZ 32
#define GPT_FREQ (GPT_FREQ_KHZ * 1000) /* 32 KHz */
/**
* timer_init - initialize timer
*/
void init_timer(void)
{
writel(0, GPT_ENABLE);
writel(GPT_ENABLE_EN, GPT_ENABLE);
}
/**
* udelay - generates micro second delay.
* @usec: delay duration in microseconds
*
* With 32KHz clock, minimum possible delay is 31.25 Micro seconds and
* its multiples. In Rumi GPT clock is 32 KHz
*/
void udelay(unsigned usec)
{
unsigned val;
unsigned now, last;
unsigned runcount;
usec = (usec + GPT_FREQ_KHZ - 1) / GPT_FREQ_KHZ;
last = readl(GPT_COUNT_VAL);
runcount = last;
val = usec + last;
do {
now = readl(GPT_COUNT_VAL);
if (last > now)
runcount += ((GPT_FREQ - last) + now);
else
runcount += (now - last);
last = now;
} while (runcount < val);
}
#if 0
/*
* TODO(vbendeb) clean it up later.
* Compile out the below code but leave it for now in case it will become
* necessary later in order to make the platform fully functional.
*/
static unsigned long timestamp;
static unsigned long lastinc;
inline ulong gpt_to_sys_freq(unsigned int gpt)
{
/*
* get_timer() expects the timer increments to be in terms
* of CONFIG_SYS_HZ. Convert GPT timer values to CONFIG_SYS_HZ
* units.
*/
return (((ulong)gpt) / (GPT_FREQ / CONFIG_SYS_HZ));
}
/**
* get_timer_masked - returns current ticks
*
* Returns the current timer ticks, since boot.
*/
ulong get_timer_masked(void)
{
ulong now = gpt_to_sys_freq(readl(GPT_COUNT_VAL));
if (lastinc <= now) { /* normal mode (non roll) */
/* normal mode */
timestamp += now - lastinc;
/* move stamp forward with absolute diff ticks */
} else { /* we have overflow of the count down timer */
timestamp += now + (TIMER_LOAD_VAL - lastinc);
}
lastinc = now;
return timestamp;
}
unsigned long long get_ticks(void)
{
return readl(GPT_COUNT_VAL);
}
/*
* Return the number of timer ticks per second.
*/
ulong get_tbclk(void)
{
return GPT_FREQ;
}
#endif
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