mirror of
https://github.com/zephyrproject-rtos/zephyr
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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>
82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
/*
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* Copyright (c) 2017 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 <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 <altera_common.h>
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#include "altera_avalon_timer_regs.h"
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#include "altera_avalon_timer.h"
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#include "legacy_api.h"
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static u32_t accumulated_cycle_count;
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static s32_t _sys_idle_elapsed_ticks = 1;
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static void timer_irq_handler(void *unused)
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{
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ARG_UNUSED(unused);
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#ifdef CONFIG_EXECUTION_BENCHMARKING
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extern void read_timer_start_of_tick_handler(void);
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read_timer_start_of_tick_handler();
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#endif
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accumulated_cycle_count += sys_clock_hw_cycles_per_tick();
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/* Clear the interrupt */
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alt_handle_irq((void *)TIMER_0_BASE, TIMER_0_IRQ);
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z_clock_announce(_sys_idle_elapsed_ticks);
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#ifdef CONFIG_EXECUTION_BENCHMARKING
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extern void read_timer_end_of_tick_handler(void);
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read_timer_end_of_tick_handler();
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#endif
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}
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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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IOWR_ALTERA_AVALON_TIMER_PERIODL(TIMER_0_BASE,
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sys_clock_hw_cycles_per_tick() & 0xFFFF);
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IOWR_ALTERA_AVALON_TIMER_PERIODH(TIMER_0_BASE,
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(sys_clock_hw_cycles_per_tick() >> 16) & 0xFFFF);
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IRQ_CONNECT(TIMER_0_IRQ, 0, timer_irq_handler, NULL, 0);
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irq_enable(TIMER_0_IRQ);
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alt_avalon_timer_sc_init((void *)TIMER_0_BASE, 0,
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TIMER_0_IRQ, sys_clock_hw_cycles_per_tick());
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return 0;
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}
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u32_t _timer_cycle_get_32(void)
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{
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/* Per the Altera Embedded IP Peripherals guide, you cannot
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* use a timer instance for both the system clock and timestamps
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* at the same time.
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*
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* Having this function return accumulated_cycle_count + get_snapshot()
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* does not work reliably. It's possible for the current countdown
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* to reset to the next interval before the timer interrupt is
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* delivered (and accumulated cycle count gets updated). The result
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* is an unlucky call to this function will appear to jump backward
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* in time.
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*
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* To properly obtain timestamps, the CPU must be configured with
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* a second timer peripheral instance that is configured to
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* count down from some large initial 64-bit value. This
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* is currently unimplemented.
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*/
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return accumulated_cycle_count;
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}
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