/*

* Copyright (c) 2016, Intel Corporation

* 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 Intel Corporation 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.

*

* Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>

*/

#include <xtensa/xtruntime.h>

#include <xtensa/hal.h>

#include <arch/timer.h>

#include <platform/memory.h>

#include <platform/interrupt.h>

#include <platform/timer.h>

#include <sof/mailbox.h>

#include <sof/debug.h>

#include <sof/timer.h>

#include <sof/interrupt.h>

#include <stdint.h>

#include <errno.h>

struct timer_data {

void (*handler2)(void *arg);

void *arg2;

};

static struct timer_data xtimer[3] = {};

void timer_64_handler(void *arg)

{

struct timer *timer = arg;

struct timer_data *tdata = timer->timer_data;

uint32_t ccompare;

/* get comparator value - will tell us timeout reason */

switch (timer->id) {

case TIMER0:

ccompare = xthal_get_ccompare(0);

break;

case TIMER1:

ccompare = xthal_get_ccompare(1);

break;

case TIMER2:

ccompare = xthal_get_ccompare(2);

break;

default:

return;

}

/* is this a 32 bit rollover ? */

if (ccompare == 1) {

/* roll over the timer */

timer->hitime++;

arch_timer_clear(timer);

} else {

/* no roll over, run the handler */

tdata->handler2(tdata->arg2);

}

/* get next timeout value */

if (timer->hitimeout == timer->hitime) {

/* timeout is in this 32 bit period */

ccompare = timer->lowtimeout;

} else {

/* timeout is in another 32 bit period */

ccompare = 1;

}

switch (timer->id) {

case TIMER0:

xthal_set_ccompare(0, ccompare);

break;

case TIMER1:

xthal_set_ccompare(1, ccompare);

break;

case TIMER2:

xthal_set_ccompare(2, ccompare);

break;

default:

return;

}

}

int timer64_register(struct timer *timer, void(*handler)(void *arg), void *arg)

{

struct timer_data *tdata;

switch (timer->id) {

case TIMER0:

tdata = &xtimer[0];

break;

case TIMER1:

tdata = &xtimer[1];

break;

case TIMER2:

tdata = &xtimer[2];

break;

default:

return -EINVAL;

}

tdata->handler2 = handler;

tdata->arg2 = arg;

timer->timer_data = tdata;

timer->hitime = 0;

timer->hitimeout = 0;

return 0;

}

uint64_t arch_timer_get_system(struct timer *timer)

{

uint64_t time;

uint32_t flags;

uint32_t low;

uint32_t high;

uint32_t ccompare;

switch (timer->id) {

case TIMER0:

ccompare = xthal_get_ccompare(0);

break;

case TIMER1:

ccompare = xthal_get_ccompare(1);

break;

case TIMER2:

ccompare = xthal_get_ccompare(2);

break;

default:

return 0;

}

flags = arch_interrupt_global_disable();

/* read low 32 bits */

low = xthal_get_ccount();

/* check and see whether 32bit IRQ is pending for timer */

if (arch_interrupt_get_status() & (1 << timer->irq) && ccompare == 1) {

/* yes, overflow has occured but handler has not run */

high = timer->hitime + 1;

} else {

/* no overflow */

high = timer->hitime;

}

time = ((uint64_t)high << 32) | low;

arch_interrupt_global_enable(flags);

return time;

}

int arch_timer_set(struct timer *timer, uint64_t ticks)

{

uint32_t time = 1;

uint32_t hitimeout = ticks >> 32;

uint32_t flags;

/* value of 1 represents rollover */

if ((ticks & 0xffffffff) == 0x1)

ticks++;

flags = arch_interrupt_global_disable();

/* same hi 64 bit context as ticks ? */

if (hitimeout < timer->hitime) {

/* cant be in the past */

arch_interrupt_global_enable(flags);

return -EINVAL;

} else {

/* set for checking at next timeout */

time = ticks;

timer->hitimeout = hitimeout;

timer->lowtimeout = ticks;

}

switch (timer->id) {

case TIMER0:

xthal_set_ccompare(0, time);

break;

case TIMER1:

xthal_set_ccompare(1, time);

break;

case TIMER2:

xthal_set_ccompare(2, time);

break;

default:

return -EINVAL;

}

arch_interrupt_global_enable(flags);

return 0;

}

void timer_unregister(struct timer *timer)

{

interrupt_unregister(timer->irq);

}

void timer_enable(struct timer *timer)

{

interrupt_enable(timer->irq);

}

void timer_disable(struct timer *timer)

{

interrupt_disable(timer->irq);

}