mirror of
https://github.com/zephyrproject-rtos/zephyr
synced 2025-09-01 10:15:57 +00:00
4344e27c26
Update reserved function names starting with one underscore, replacing them as follows: '_k_' with 'z_' '_K_' with 'Z_' '_handler_' with 'z_handl_' '_Cstart' with 'z_cstart' '_Swap' with 'z_swap' This renaming is done on both global and those static function names in kernel/include and include/. Other static function names in kernel/ are renamed by removing the leading underscore. Other function names not starting with any prefix listed above are renamed starting with a 'z_' or 'Z_' prefix. Function names starting with two or three leading underscores are not automatcally renamed since these names will collide with the variants with two or three leading underscores. Various generator scripts have also been updated as well as perf, linker and usb files. These are drivers/serial/uart_handlers.c include/linker/kobject-text.ld kernel/include/syscall_handler.h scripts/gen_kobject_list.py scripts/gen_syscall_header.py Signed-off-by: Patrik Flykt <patrik.flykt@intel.com>
129 lines
2.7 KiB
C
129 lines
2.7 KiB
C
/*
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* Copyright (c) 2018 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <drivers/system_timer.h>
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#include <sys_clock.h>
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#include <spinlock.h>
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#include <xtensa_rtos.h>
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#define TIMER_IRQ UTIL_CAT(XCHAL_TIMER, \
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UTIL_CAT(CONFIG_XTENSA_TIMER_ID, _INTERRUPT))
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#define CYC_PER_TICK (CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC \
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/ CONFIG_SYS_CLOCK_TICKS_PER_SEC)
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#define MAX_TICKS ((0xffffffffu - CYC_PER_TICK) / CYC_PER_TICK)
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#define MIN_DELAY 1000
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static struct k_spinlock lock;
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static unsigned int last_count;
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static void set_ccompare(u32_t val)
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{
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__asm__ volatile ("wsr.CCOMPARE" STRINGIFY(CONFIG_XTENSA_TIMER_ID) " %0"
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:: "r"(val));
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}
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static u32_t ccount(void)
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{
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u32_t val;
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__asm__ volatile ("rsr.CCOUNT %0" : "=r"(val));
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return val;
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}
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static void ccompare_isr(void *arg)
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{
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ARG_UNUSED(arg);
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k_spinlock_key_t key = k_spin_lock(&lock);
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u32_t curr = ccount();
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u32_t dticks = (curr - last_count) / CYC_PER_TICK;
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last_count += dticks * CYC_PER_TICK;
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if (!IS_ENABLED(CONFIG_TICKLESS_KERNEL) ||
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IS_ENABLED(CONFIG_QEMU_TICKLESS_WORKAROUND)) {
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u32_t next = last_count + CYC_PER_TICK;
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if ((s32_t)(next - curr) < MIN_DELAY) {
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next += CYC_PER_TICK;
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}
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set_ccompare(next);
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}
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k_spin_unlock(&lock, key);
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z_clock_announce(IS_ENABLED(CONFIG_TICKLESS_KERNEL) ? dticks : 1);
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}
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/* The legacy Xtensa platform code handles the timer interrupt via a
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* special path and must find it via this name. Remove once ASM2 is
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* pervasive.
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*/
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#ifndef CONFIG_XTENSA_ASM2
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void _timer_int_handler(void *arg)
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{
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return ccompare_isr(arg);
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}
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#endif
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int z_clock_driver_init(struct device *device)
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{
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IRQ_CONNECT(TIMER_IRQ, 0, ccompare_isr, 0, 0);
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set_ccompare(ccount() + CYC_PER_TICK);
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irq_enable(TIMER_IRQ);
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return 0;
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}
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void z_clock_set_timeout(s32_t ticks, bool idle)
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{
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ARG_UNUSED(idle);
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#if defined(CONFIG_TICKLESS_KERNEL) && !defined(CONFIG_QEMU_TICKLESS_WORKAROUND)
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ticks = ticks == K_FOREVER ? MAX_TICKS : ticks;
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ticks = MAX(MIN(ticks - 1, (s32_t)MAX_TICKS), 0);
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k_spinlock_key_t key = k_spin_lock(&lock);
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u32_t curr = ccount(), cyc;
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/* Round up to next tick boundary */
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cyc = ticks * CYC_PER_TICK + (curr - last_count) + (CYC_PER_TICK - 1);
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cyc = (cyc / CYC_PER_TICK) * CYC_PER_TICK;
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cyc += last_count;
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if ((cyc - curr) < MIN_DELAY) {
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cyc += CYC_PER_TICK;
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}
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set_ccompare(cyc);
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k_spin_unlock(&lock, key);
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#endif
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}
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u32_t z_clock_elapsed(void)
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{
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if (!IS_ENABLED(CONFIG_TICKLESS_KERNEL)) {
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return 0;
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}
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k_spinlock_key_t key = k_spin_lock(&lock);
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u32_t ret = (ccount() - last_count) / CYC_PER_TICK;
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k_spin_unlock(&lock, key);
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return ret;
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}
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u32_t z_timer_cycle_get_32(void)
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{
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return ccount();
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}
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#ifdef CONFIG_SMP
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void smp_timer_init(void)
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{
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set_ccompare(ccount() + CYC_PER_TICK);
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irq_enable(TIMER_IRQ);
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}
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#endif
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