155 lines
3.7 KiB
C
155 lines
3.7 KiB
C
/*
|
|
* Copyright (c) 2017 Oticon A/S
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
/**
|
|
* Driver for the timer model of the POSIX native_posix board
|
|
* It provides the interfaces required by the kernel and the sanity testcases
|
|
* It also provides a custom k_busy_wait() which can be used with the
|
|
* POSIX arch and InfClock SOC
|
|
*/
|
|
|
|
#include "zephyr/types.h"
|
|
#include "irq.h"
|
|
#include "device.h"
|
|
#include "drivers/system_timer.h"
|
|
#include "sys_clock.h"
|
|
#include "timer_model.h"
|
|
#include "soc.h"
|
|
#include "posix_trace.h"
|
|
|
|
#include "legacy_api.h"
|
|
|
|
static u64_t tick_period; /* System tick period in number of hw cycles */
|
|
static s64_t silent_ticks;
|
|
static s32_t _sys_idle_elapsed_ticks = 1;
|
|
|
|
/**
|
|
* Return the current HW cycle counter
|
|
* (number of microseconds since boot in 32bits)
|
|
*/
|
|
u32_t _timer_cycle_get_32(void)
|
|
{
|
|
return hwm_get_time();
|
|
}
|
|
|
|
#ifdef CONFIG_TICKLESS_IDLE
|
|
|
|
/*
|
|
* Do not raise another ticker interrupt until the sys_ticks'th one
|
|
* e.g. if sys_ticks is 10, do not raise the next 9 ones
|
|
*
|
|
* if sys_ticks is K_FOREVER (or another negative number),
|
|
* we will effectively silence the tick interrupts forever
|
|
*/
|
|
void _timer_idle_enter(s32_t sys_ticks)
|
|
{
|
|
if (silent_ticks > 0) { /* LCOV_EXCL_BR_LINE */
|
|
/* LCOV_EXCL_START */
|
|
posix_print_warning("native timer: Re-entering idle mode with "
|
|
"%i ticks pending\n",
|
|
silent_ticks);
|
|
z_clock_idle_exit();
|
|
/* LCOV_EXCL_STOP */
|
|
}
|
|
if (sys_ticks < 0) {
|
|
silent_ticks = INT64_MAX;
|
|
} else if (sys_ticks > 0) {
|
|
silent_ticks = sys_ticks - 1;
|
|
} else {
|
|
silent_ticks = 0;
|
|
}
|
|
hwtimer_set_silent_ticks(silent_ticks);
|
|
}
|
|
|
|
/*
|
|
* Exit from idle mode
|
|
*
|
|
* If we have been silent for a number of ticks, announce immediately to the
|
|
* kernel how many silent ticks have passed.
|
|
* If this is called due to the 1st non silent timer interrupt, sp_timer_isr()
|
|
* will be called right away, which will announce that last (non silent) one.
|
|
*
|
|
* Note that we do not assume this function is called before the interrupt is
|
|
* raised (the interrupt can handle it announcing all ticks)
|
|
*/
|
|
void z_clock_idle_exit(void)
|
|
{
|
|
silent_ticks -= hwtimer_get_pending_silent_ticks();
|
|
if (silent_ticks > 0) {
|
|
_sys_idle_elapsed_ticks = silent_ticks;
|
|
z_clock_announce(_sys_idle_elapsed_ticks);
|
|
}
|
|
silent_ticks = 0;
|
|
hwtimer_set_silent_ticks(0);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* Interrupt handler for the timer interrupt
|
|
* Announce to the kernel that a tick has passed
|
|
*/
|
|
static void sp_timer_isr(void *arg)
|
|
{
|
|
ARG_UNUSED(arg);
|
|
_sys_idle_elapsed_ticks = silent_ticks + 1;
|
|
silent_ticks = 0;
|
|
z_clock_announce(_sys_idle_elapsed_ticks);
|
|
}
|
|
|
|
/*
|
|
* Enable the hw timer, setting its tick period, and setup its interrupt
|
|
*/
|
|
int z_clock_driver_init(struct device *device)
|
|
{
|
|
ARG_UNUSED(device);
|
|
|
|
tick_period = 1000000ul / CONFIG_SYS_CLOCK_TICKS_PER_SEC;
|
|
|
|
hwtimer_enable(tick_period);
|
|
|
|
IRQ_CONNECT(TIMER_TICK_IRQ, 1, sp_timer_isr, 0, 0);
|
|
irq_enable(TIMER_TICK_IRQ);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
#if defined(CONFIG_ARCH_HAS_CUSTOM_BUSY_WAIT)
|
|
/**
|
|
* Replacement to the kernel k_busy_wait()
|
|
* Will block this thread (and therefore the whole zephyr) during usec_to_wait
|
|
*
|
|
* Note that interrupts may be received in the meanwhile and that therefore this
|
|
* thread may loose context
|
|
*/
|
|
void k_busy_wait(u32_t usec_to_wait)
|
|
{
|
|
u64_t time_end = hwm_get_time() + usec_to_wait;
|
|
|
|
while (hwm_get_time() < time_end) {
|
|
/*There may be wakes due to other interrupts*/
|
|
hwtimer_wake_in_time(time_end);
|
|
posix_halt_cpu();
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#if defined(CONFIG_SYSTEM_CLOCK_DISABLE)
|
|
/**
|
|
*
|
|
* @brief Stop announcing sys ticks into the kernel
|
|
*
|
|
* Disable the system ticks generation
|
|
*
|
|
* @return N/A
|
|
*/
|
|
void sys_clock_disable(void)
|
|
{
|
|
irq_disable(TIMER_TICK_IRQ);
|
|
hwtimer_set_silent_ticks(INT64_MAX);
|
|
}
|
|
#endif /* CONFIG_SYSTEM_CLOCK_DISABLE */
|