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sched: Support adding timers to the start of timer_list

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If sched_add_timer() is called on a timer that would make it the new
head of the list, then add it and signal the board code that the timer
should be rescheduled.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2017-07-27 12:19:09 -04:00
parent 62f77f6bc5
commit 6a63c27542
7 changed files with 62 additions and 45 deletions
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24
src/sam3x8e/timer.c
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@@ -1,6 +1,6 @@
// SAM3x8e timer interrupt scheduling
//
// Copyright (C) 2016 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2016,2017 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
@@ -9,7 +9,7 @@
#include "board/timer_irq.h" // timer_dispatch_many
#include "command.h" // DECL_SHUTDOWN
#include "sam3x8e.h" // TC0
#include "sched.h" // sched_timer_kick
#include "sched.h" // DECL_INIT
// Set the next irq time
static void
@@ -32,6 +32,14 @@ timer_read_time(void)
return TC0->TC_CHANNEL[0].TC_CV;
}
// Activate timer dispatch as soon as possible
void
timer_kick(void)
{
timer_set(timer_read_time() + 50);
TC0->TC_CHANNEL[0].TC_SR; // read to clear irq pending
}
void
timer_init(void)
{
@@ -39,27 +47,17 @@ timer_init(void)
// Reset the timer
tc->TC_CCR = TC_CCR_CLKDIS;
tc->TC_IDR = 0xFFFFFFFF;
tc->TC_SR;
// Enable it
PMC->PMC_PCER0 = 1 << ID_TC0;
tc->TC_CMR = TC_CMR_WAVE | TC_CMR_WAVSEL_UP | TC_CMR_TCCLKS_TIMER_CLOCK1;
tc->TC_IER = TC_IER_CPAS;
NVIC_SetPriority(TC0_IRQn, 1);
NVIC_EnableIRQ(TC0_IRQn);
timer_set(1);
timer_kick();
tc->TC_CCR = TC_CCR_CLKEN | TC_CCR_SWTRG;
}
DECL_INIT(timer_init);
void
timer_shutdown(void)
{
// Reenable timer irq
timer_set(timer_read_time() + 50);
TC0->TC_CHANNEL[0].TC_SR; // read to clear irq pending
}
DECL_SHUTDOWN(timer_shutdown);
// IRQ handler
void __visible __aligned(16) // aligning helps stabilize perf benchmarks
TC0_Handler(void)