1a1a9539ea
Rename timer driver API functions to be consistent. ADD DOCS TO THE HEADER so implementations understand what the requirements are. Remove some unused functions that don't need declarations here. Also removes the per-platform #if's around the power control callback in favor of a weak-linked noop function in the driver initialization (adds a few bytes of code to default platforms -- we'll live, I think). Signed-off-by: Andy Ross <andrew.j.ross@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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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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z_clock_announce(1);
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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 z_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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u32_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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