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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2011, 2017 embedded brains GmbH & Co. KG
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <rtems/timecounter.h>
#include <libcpu/powerpc-utility.h>
#include <bsp.h>
#include <bsp/irq.h>
/* This is defined in dev/clock/clockimpl.h */
static rtems_isr Clock_isr(void *arg);
static struct timecounter t32mppc_clock_tc;
#define CLOCK_DRIVER_USE_ONLY_BOOT_PROCESSOR
void t32mppc_decrementer_dispatch(void)
{
PPC_SET_SPECIAL_PURPOSE_REGISTER(BOOKE_TSR, BOOKE_TSR_DIS);
Clock_isr(NULL);
}
static uint32_t t32mppc_clock_get_timecount(struct timecounter *tc)
{
return ppc_time_base();
}
static void t32mppc_clock_initialize(void)
{
uint64_t frequency = bsp_time_base_frequency / 10;
uint32_t us_per_tick = rtems_configuration_get_microseconds_per_tick();
uint32_t interval = (uint32_t) ((frequency * us_per_tick) / 1000000);
PPC_SET_SPECIAL_PURPOSE_REGISTER(BOOKE_DECAR, interval - 1);
PPC_SET_SPECIAL_PURPOSE_REGISTER_BITS(
BOOKE_TCR,
BOOKE_TCR_DIE | BOOKE_TCR_ARE
);
ppc_set_decrementer_register(interval - 1);
t32mppc_clock_tc.tc_get_timecount = t32mppc_clock_get_timecount;
t32mppc_clock_tc.tc_counter_mask = 0xffffffff;
t32mppc_clock_tc.tc_frequency = bsp_time_base_frequency;
t32mppc_clock_tc.tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER;
rtems_timecounter_install(&t32mppc_clock_tc);
}
#define Clock_driver_support_initialize_hardware() \
t32mppc_clock_initialize()
/* Include shared source clock driver code */
#include "../../../shared/dev/clock/clockimpl.h"
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