forked from Imagelibrary/rtems
0149e6e749
Updates the recently merged relicensed files with the 2-Clause BSD SPDX annotation. Closes #5208.
112 lines
3.7 KiB
C
112 lines
3.7 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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*
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* @ingroup RTEMSDriverClockImpl
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*
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* @brief This source file contains the implementation of the BCM2835 Clock
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* Driver.
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*/
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/*
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* Copyright (C) 2013 Alan Cudmore
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* Copyright (C) 2016 Pavel Pisa
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <rtems.h>
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#include <bsp.h>
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#include <bsp/irq.h>
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#include <bsp/irq-generic.h>
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#include <bsp/raspberrypi.h>
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#include <rtems/timecounter.h>
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static struct timecounter raspberrypi_tc;
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static uint32_t raspberrypi_clock_get_timecount(struct timecounter *tc)
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{
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return BCM2835_REG(BCM2835_GPU_TIMER_CLO);
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}
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static void raspberrypi_clock_at_tick(void)
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{
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uint32_t act_val;
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uint32_t next_cmp = BCM2835_REG(BCM2835_GPU_TIMER_C3);
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next_cmp += rtems_configuration_get_microseconds_per_tick();
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BCM2835_REG(BCM2835_GPU_TIMER_C3) = next_cmp;
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act_val = BCM2835_REG(BCM2835_GPU_TIMER_CLO);
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/*
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* Clear interrupt only if there is time left to the next tick.
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* If time of the next tick has already passed then interrupt
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* request stays active and fires immediately after current tick
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* processing is finished.
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*/
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if ((int32_t)(next_cmp - act_val) > 0)
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BCM2835_REG(BCM2835_GPU_TIMER_CS) = BCM2835_GPU_TIMER_CS_M3;
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}
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static void raspberrypi_clock_handler_install_isr(
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rtems_interrupt_handler clock_isr
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)
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{
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rtems_status_code sc = RTEMS_SUCCESSFUL;
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sc = rtems_interrupt_handler_install(
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BCM2835_IRQ_ID_GPU_TIMER_M3,
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"Clock",
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RTEMS_INTERRUPT_UNIQUE,
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clock_isr,
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NULL
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);
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if ( sc != RTEMS_SUCCESSFUL ) {
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rtems_fatal_error_occurred(0xdeadbeef);
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}
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}
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static void raspberrypi_clock_initialize_hardware(void)
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{
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uint32_t next_cmp = BCM2835_REG(BCM2835_GPU_TIMER_CLO);
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next_cmp += rtems_configuration_get_microseconds_per_tick();
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BCM2835_REG(BCM2835_GPU_TIMER_C3) = next_cmp;
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BCM2835_REG(BCM2835_GPU_TIMER_CS) = BCM2835_GPU_TIMER_CS_M3;
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raspberrypi_tc.tc_get_timecount = raspberrypi_clock_get_timecount;
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raspberrypi_tc.tc_counter_mask = 0xffffffff;
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raspberrypi_tc.tc_frequency = 1000000; /* 1 MHz */
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raspberrypi_tc.tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER;
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rtems_timecounter_install(&raspberrypi_tc);
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}
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#define Clock_driver_support_at_tick(arg) raspberrypi_clock_at_tick()
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#define Clock_driver_support_initialize_hardware() raspberrypi_clock_initialize_hardware()
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#define Clock_driver_support_install_isr(clock_isr) \
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raspberrypi_clock_handler_install_isr(clock_isr)
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#define CLOCK_DRIVER_USE_ONLY_BOOT_PROCESSOR 1
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#include "../../../shared/dev/clock/clockimpl.h"
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