mirror of https://github.com/marqs85/ossc.git
111 lines
4.7 KiB
C
111 lines
4.7 KiB
C
/******************************************************************************
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* *
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* License Agreement *
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* *
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* Copyright (c) 2003 Altera Corporation, San Jose, California, USA. *
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* All rights reserved. *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the "Software"), *
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* to deal in the Software without restriction, including without limitation *
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, *
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* and/or sell copies of the Software, and to permit persons to whom the *
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* Software is furnished to do so, subject to the following conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in *
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* 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, EXPRESS OR *
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *
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* DEALINGS IN THE SOFTWARE. *
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* *
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* This agreement shall be governed in all respects by the laws of the State *
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* of California and by the laws of the United States of America. *
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* *
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* Altera does not recommend, suggest or require that this reference design *
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* file be used in conjunction or combination with any other product. *
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******************************************************************************/
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#include <string.h>
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#include "sys/alt_alarm.h"
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#include "sys/alt_irq.h"
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#include "altera_avalon_timer.h"
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#include "altera_avalon_timer_regs.h"
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#include "alt_types.h"
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#include "sys/alt_log_printf.h"
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/*
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* alt_avalon_timer_sc_irq() is the interrupt handler used for the system
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* clock. This is called periodically when a timer interrupt occurs. The
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* function first clears the interrupt condition, and then calls the
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* alt_tick() function to notify the system that a timer tick has occurred.
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*
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* alt_tick() increments the system tick count, and updates any registered
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* alarms, see alt_tick.c for further details.
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*/
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#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT
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static void alt_avalon_timer_sc_irq (void* base)
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#else
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static void alt_avalon_timer_sc_irq (void* base, alt_u32 id)
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#endif
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{
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alt_irq_context cpu_sr;
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/* clear the interrupt */
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IOWR_ALTERA_AVALON_TIMER_STATUS (base, 0);
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/*
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* Dummy read to ensure IRQ is negated before the ISR returns.
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* The control register is read because reading the status
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* register has side-effects per the register map documentation.
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*/
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IORD_ALTERA_AVALON_TIMER_CONTROL (base);
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/* ALT_LOG - see altera_hal/HAL/inc/sys/alt_log_printf.h */
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ALT_LOG_SYS_CLK_HEARTBEAT();
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/*
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* Notify the system of a clock tick. disable interrupts
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* during this time to safely support ISR preemption
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*/
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cpu_sr = alt_irq_disable_all();
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alt_tick ();
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alt_irq_enable_all(cpu_sr);
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}
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/*
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* alt_avalon_timer_sc_init() is called to initialise the timer that will be
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* used to provide the periodic system clock. This is called from the
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* auto-generated alt_sys_init() function.
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*/
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void alt_avalon_timer_sc_init (void* base, alt_u32 irq_controller_id,
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alt_u32 irq, alt_u32 freq)
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{
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/* set the system clock frequency */
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alt_sysclk_init (freq);
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/* set to free running mode */
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IOWR_ALTERA_AVALON_TIMER_CONTROL (base,
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ALTERA_AVALON_TIMER_CONTROL_ITO_MSK |
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ALTERA_AVALON_TIMER_CONTROL_CONT_MSK |
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ALTERA_AVALON_TIMER_CONTROL_START_MSK);
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/* register the interrupt handler, and enable the interrupt */
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#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT
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alt_ic_isr_register(irq_controller_id, irq, alt_avalon_timer_sc_irq,
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base, NULL);
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#else
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alt_irq_register (irq, base, alt_avalon_timer_sc_irq);
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#endif
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}
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