102 lines
2.7 KiB
C
102 lines
2.7 KiB
C
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/*
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* Copyright (c) 2008 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <sys/types.h>
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#include <err.h>
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#include <kernel/thread.h>
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#include <debug.h>
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#include <platform.h>
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#include <platform/interrupts.h>
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#include <platform/timer.h>
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#include <platform/integrator.h>
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#include "platform_p.h"
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static time_t system_time = 0;
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static time_t tick_interval;
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static uint32_t ticks_per_interval;
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static platform_timer_callback t_callback;
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static void *callback_arg;
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status_t platform_set_periodic_timer(platform_timer_callback callback, void *arg, time_t interval)
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{
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#if 0
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enter_critical_section();
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t_callback = callback;
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callback_arg = arg;
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tick_interval = interval;
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ticks_per_interval = interval * 32768 / 1000; // interval is in ms
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OS_TIMER_CTRL_REG = 0; // stop it
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OS_TIMER_TICK_VALUE_REG = ticks_per_interval;
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OS_TIMER_CTRL_REG = (1<<3) | (1<<2) | (1<<1) | (1<<0);
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exit_critical_section();
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#endif
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return NO_ERROR;
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}
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time_t current_time(void)
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{
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#if 0
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time_t t;
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uint32_t delta_ticks;
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uint32_t delta_ticks2;
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retry:
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delta_ticks = OS_TIMER_TICK_COUNTER_REG;
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t = system_time;
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delta_ticks2 = OS_TIMER_TICK_COUNTER_REG;
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if (delta_ticks2 > delta_ticks)
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goto retry;
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t += ((ticks_per_interval - delta_ticks2) * tick_interval) / ticks_per_interval;
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return t;
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#else
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static time_t time = 0;
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return time++;
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#endif
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}
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static enum handler_return os_timer_tick(void *arg)
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{
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system_time += tick_interval;
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// dprintf("os_timer_tick %d\n", system_time);
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return t_callback(callback_arg, system_time);
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}
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void platform_init_timer(void)
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{
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#if 0
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OS_TIMER_CTRL_REG = 0; // stop the timer if it's already running
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register_int_handler(IRQ_OS_TIMER, &os_timer_tick, NULL);
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unmask_interrupt(IRQ_OS_TIMER, NULL);
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#endif
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}
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