134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
/*
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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 <reg.h>
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#include <debug.h>
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#include <kernel/thread.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/omap3.h>
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#include "platform_p.h"
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static time_t tick_interval;
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static platform_timer_callback t_callback;
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static void *callback_arg;
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/* timer 2 */
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static const ulong timer_base = OMAP34XX_GPT2;
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#define TIMER_TICK_RATE 32768
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#define TIMER_REG(reg) *REG32(timer_base + (reg))
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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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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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uint32_t ticks_per_interval = (uint64_t)interval * TIMER_TICK_RATE / 1000; // interval is in ms
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TIMER_REG(TCLR) = 0; // stop the timer
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TIMER_REG(TLDR) = -ticks_per_interval;
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TIMER_REG(TTGR) = 1;
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TIMER_REG(TIER) = 0x2;
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TIMER_REG(TCLR) = 0x3; // autoreload, start
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unmask_interrupt(GPT2_IRQ);
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exit_critical_section();
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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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uint32_t delta_ticks;
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uint32_t delta_ticks2;
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retry:
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delta_ticks = *REG32(TIMER32K_CR);
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delta_ticks2 = *REG32(TIMER32K_CR);
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if (delta_ticks2 != delta_ticks)
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goto retry;
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uint64_t longtime = delta_ticks * 1000ULL / 32768ULL;
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return (time_t)longtime;
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}
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bigtime_t current_time_hires(void)
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{
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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 = *REG32(TIMER32K_CR);
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delta_ticks2 = *REG32(TIMER32K_CR);
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if (delta_ticks2 != delta_ticks)
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goto retry;
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uint64_t longtime = delta_ticks * 1000000ULL / 32768ULL;
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return (bigtime_t)longtime;
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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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TIMER_REG(TISR) = TIMER_REG(TISR);
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return t_callback(callback_arg, current_time());
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}
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void platform_init_timer(void)
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{
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/* GPT2 */
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RMWREG32(CM_CLKSEL_PER, 0, 1, 1);
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RMWREG32(CM_ICLKEN_PER, 3, 1, 1);
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RMWREG32(CM_FCLKEN_PER, 3, 1, 1);
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// reset the GP timer
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TIMER_REG(TIOCP_CFG) = 0x2;
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while ((TIMER_REG(TISTAT) & 1) == 0)
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;
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// set GPT2-9 clock inputs over to 32k
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*REG32(CM_CLKSEL_PER) = 0;
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// disable ints
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TIMER_REG(TIER) = 0;
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TIMER_REG(TISR) = 0x7; // clear any pending bits
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// XXX make sure 32K timer is running
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register_int_handler(GPT2_IRQ, &os_timer_tick, NULL);
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}
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void platform_halt_timers(void)
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{
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TIMER_REG(TCLR) = 0;
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}
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