96013b0375
The current z_clock_uptime() call (recently renamed from _get_elapsed_program_time) requires the driver to track a full 64 bit uptime value in ticks, which is entirely separate from the one the kernel is already keeping. Don't do that. Just ask the drivers to track uptime since the last call to z_clock_announce(), since that is going to map better to built-in hardware capability. Obviously existing drivers already have this feature, so they're actually getting slightly larger in order to implement the new API in terms of the old one. But future drivers will thank us. Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
80 lines
1.6 KiB
C
80 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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u32_t z_clock_elapsed(void)
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{
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return 0;
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}
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