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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u32_t val;
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u32_t ctrl;
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u32_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 u32_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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