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https://github.com/zephyrproject-rtos/zephyr
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e08d07c97d
Some arches may want to define this as an inline function, or define in core arch code instead of timer driver code. Unfortunately, this means we need to remove from the footprint tests, but this is not typically a large function. Issue: ZEP-1546 Change-Id: Ic0d7a33507da855995838f4703d872cd613a2ca2 Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
75 lines
1.6 KiB
C
75 lines
1.6 KiB
C
/*
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* Copyright (c) 2016 Jean-Paul Etienne <fractalclone@gmail.com>
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <kernel.h>
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#include <arch/cpu.h>
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#include <device.h>
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#include <system_timer.h>
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#include <board.h>
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/* Timer Ctrl Bitfields */
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#define TIMER_CTRL_EN (1 << 0) /* Timer Enable Bit */
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#define TIMER_CTRL_PRE(x) (((x) & 0x07) << 3) /* Prescaler Value */
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typedef struct {
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uint32_t val;
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uint32_t ctrl;
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uint32_t cmp;
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} pulpino_timer_t;
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static volatile pulpino_timer_t *timer = (pulpino_timer_t *)PULP_TIMER_A_BASE;
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static uint32_t accumulated_cycle_count;
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static void pulpino_timer_irq_handler(void *unused)
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{
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ARG_UNUSED(unused);
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/* Reset counter */
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timer->val = 0;
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accumulated_cycle_count += sys_clock_hw_cycles_per_tick;
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_sys_clock_tick_announce();
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}
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#ifdef CONFIG_TICKLESS_IDLE
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#error "Tickless idle not yet implemented for pulpino timer"
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#endif
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int _sys_clock_driver_init(struct device *device)
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{
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ARG_UNUSED(device);
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IRQ_CONNECT(PULP_TIMER_A_CMP_IRQ, 0,
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pulpino_timer_irq_handler, NULL, 0);
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irq_enable(PULP_TIMER_A_CMP_IRQ);
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/*
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* Initialize timer.
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* Reset counter and set timer to generate interrupt
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* every sys_clock_hw_cycles_per_tick
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*/
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timer->val = 0;
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timer->cmp = sys_clock_hw_cycles_per_tick;
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timer->ctrl = TIMER_CTRL_EN;
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return 0;
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}
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/**
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*
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* @brief Read the platform's timer hardware
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*
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* This routine returns the current time in terms of timer hardware clock
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* cycles.
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*
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* @return up counter of elapsed clock cycles
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*/
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uint32_t _timer_cycle_get_32(void)
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{
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return accumulated_cycle_count + timer->val;
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}
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