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/* Copyright (c) 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 Code Aurora Forum, 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 "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 <debug.h>
#include <reg.h>
#include <compiler.h>
#include <qtimer.h>
#include <platform/irqs.h>
#include <platform/iomap.h>
#include <platform/interrupts.h>
#include <qtimer_mmap_hw.h>
static platform_timer_callback timer_callback;
static void *timer_arg;
static time_t timer_interval;
/* time in ms from start of LK. */
static volatile uint32_t current_time;
static uint32_t tick_count;
extern void dsb();
static void qtimer_enable();
static enum handler_return qtimer_irq(void *arg)
{
current_time += timer_interval;
/* Program the down counter again to get
* an interrupt after timer_interval msecs
*/
writel(tick_count, QTMR_V1_CNTP_TVAL);
dsb();
return timer_callback(timer_arg, current_time);
}
/* Programs the Physical Secure Down counter timer.
* interval : Counter ticks till expiry interrupt is fired.
*/
void qtimer_set_physical_timer(time_t msecs_interval,
platform_timer_callback tmr_callback,
void *tmr_arg)
{
qtimer_disable();
/* Save the timer interval and call back data*/
tick_count = msecs_interval * qtimer_tick_rate() / 1000;;
timer_interval = msecs_interval;
timer_arg = tmr_arg;
timer_callback = tmr_callback;
/* Set Physical Down Counter */
writel(tick_count, QTMR_V1_CNTP_TVAL);
dsb();
register_int_handler(INT_QTMR_FRM_0_PHYSICAL_TIMER_EXP, qtimer_irq, 0);
unmask_interrupt(INT_QTMR_FRM_0_PHYSICAL_TIMER_EXP);
qtimer_enable();
}
/* Function to return the frequency of the timer */
uint32_t qtimer_get_frequency()
{
uint32_t freq;
/* Read the Global counter frequency */
/* freq = readl(QTMR_V1_CNTFRQ); */
/* TODO: remove this when bootchaint sets up the frequency. */
freq = 19200000;
return freq;
}
static void qtimer_enable()
{
uint32_t ctrl;
ctrl = readl(QTMR_V1_CNTP_CTL);
/* Program CTRL Register */
ctrl |= QTMR_TIMER_CTRL_ENABLE;
ctrl &= ~QTMR_TIMER_CTRL_INT_MASK;
writel(ctrl, QTMR_V1_CNTP_CTL);
dsb();
}
void qtimer_disable()
{
uint32_t ctrl;
ctrl = readl(QTMR_V1_CNTP_CTL);
/* program cntrl register */
ctrl &= ~QTMR_TIMER_CTRL_ENABLE;
ctrl |= QTMR_TIMER_CTRL_INT_MASK;
writel(ctrl, QTMR_V1_CNTP_CTL);
dsb();
}
inline __ALWAYS_INLINE uint64_t qtimer_get_phy_timer_cnt()
{
uint32_t phy_cnt_lo;
uint32_t phy_cnt_hi_1;
uint32_t phy_cnt_hi_2;
do {
phy_cnt_hi_1 = readl(QTMR_V1_CNTPCT_HI);
phy_cnt_lo = readl(QTMR_V1_CNTPCT_LO);
phy_cnt_hi_2 = readl(QTMR_V1_CNTPCT_HI);
} while (phy_cnt_hi_1 != phy_cnt_hi_2);
return ((uint64_t)phy_cnt_hi_1 << 32) | phy_cnt_lo;
}
uint32_t qtimer_current_time()
{
return current_time;
}