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