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/* SPDX-License-Identifier: BSD-2-Clause */
/* ckinit.c
*
* This file provides a template for the clock device driver initialization.
*
* Modified for sun4v - niagara
*/
/*
* Copyright (c) 2010 Gedare Bloom.
*
* 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 <stdlib.h>
#include <rtems.h>
#include <bsp.h>
#include <bspopts.h>
#include <boot/ofw.h>
#include <rtems/bspIo.h>
/* This is default frequency for simics simulator of niagara. Use the
* get_Frequency function to determine the CPU clock frequency at runtime.
*/
#define CPU_FREQ (5000000)
uint64_t sparc64_cycles_per_tick;
/* TICK_CMPR and STICK_CMPR trigger soft interrupt 14 */
#define CLOCK_VECTOR SPARC_SYNCHRONOUS_TRAP(0x4E)
static unsigned int get_Frequency(void)
{
phandle root = ofw_find_device("/");
unsigned int freq;
if (ofw_get_property(root, "clock-frequency", &freq, sizeof(freq)) <= 0) {
printk("Unable to determine frequency, default: 0x%x\n",CPU_FREQ);
return CPU_FREQ;
}
return freq;
}
#define Clock_driver_support_at_tick(arg) \
Clock_driver_support_at_tick_helper()
static void Clock_driver_support_at_tick_helper(void)
{
uint64_t tick_reg;
int bit_mask;
uint64_t pil_reg;
bit_mask = SPARC_SOFTINT_TM_MASK | SPARC_SOFTINT_SM_MASK | (1<<14);
sparc64_clear_interrupt_bits(bit_mask);
sparc64_get_pil(pil_reg);
if(pil_reg == 0xe) { /* 0xe is the tick compare interrupt (softint(14)) */
pil_reg--;
sparc64_set_pil(pil_reg); /* enable the next timer interrupt */
}
/* Note: sun4v uses stick_cmpr for clock driver for M5 simulator, which
* does not currently have tick_cmpr implemented */
/* TODO: this could be more efficiently implemented as a single assembly
* inline */
#if defined (SUN4U)
sparc64_read_tick(tick_reg);
#elif defined (SUN4V)
sparc64_read_stick(tick_reg);
#endif
tick_reg &= ~(1UL<<63); /* mask out NPT bit, prevents int_dis from being set */
tick_reg += sparc64_cycles_per_tick;
#if defined (SUN4U)
sparc64_write_tick_cmpr(tick_reg);
#elif defined (SUN4V)
sparc64_write_stick_cmpr(tick_reg);
#endif
}
#define Clock_driver_support_install_isr(_new) \
set_vector( _new, CLOCK_VECTOR, 1 )
static void Clock_driver_support_initialize_hardware(void)
{
uint64_t tick_reg;
int bit_mask;
bit_mask = SPARC_SOFTINT_TM_MASK | SPARC_SOFTINT_SM_MASK | (1<<14);
sparc64_clear_interrupt_bits(bit_mask);
sparc64_cycles_per_tick =
rtems_configuration_get_microseconds_per_tick()*(get_Frequency()/1000000);
#if defined (SUN4U)
sparc64_read_tick(tick_reg);
#elif defined (SUN4V)
sparc64_read_stick(tick_reg);
#endif
tick_reg &= ~(1UL<<63); /* mask out NPT bit, prevents int_dis from being set */
tick_reg += sparc64_cycles_per_tick;
#if defined (SUN4U)
sparc64_write_tick_cmpr(tick_reg);
#elif defined (SUN4V)
sparc64_write_stick_cmpr(tick_reg);
#endif
}
#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER
#include "../../../shared/dev/clock/clockimpl.h"
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