9c92ab6191
Based on 1 normalized pattern(s): this software is licensed under the terms of the gnu general public license version 2 as published by the free software foundation and may be copied distributed and modified under those terms this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 285 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141900.642774971@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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*
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* Copyright (C) 2015 Numascale AS. All rights reserved.
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*/
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#include <linux/clockchips.h>
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#include <asm/irq.h>
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#include <asm/numachip/numachip.h>
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#include <asm/numachip/numachip_csr.h>
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static DEFINE_PER_CPU(struct clock_event_device, numachip2_ced);
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static cycles_t numachip2_timer_read(struct clocksource *cs)
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{
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return numachip2_read64_lcsr(NUMACHIP2_TIMER_NOW);
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}
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static struct clocksource numachip2_clocksource = {
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.name = "numachip2",
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.rating = 295,
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.read = numachip2_timer_read,
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.mask = CLOCKSOURCE_MASK(64),
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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.mult = 1,
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.shift = 0,
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};
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static int numachip2_set_next_event(unsigned long delta, struct clock_event_device *ced)
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{
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numachip2_write64_lcsr(NUMACHIP2_TIMER_DEADLINE + numachip2_timer(),
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delta);
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return 0;
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}
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static const struct clock_event_device numachip2_clockevent __initconst = {
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.name = "numachip2",
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.rating = 400,
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.set_next_event = numachip2_set_next_event,
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.features = CLOCK_EVT_FEAT_ONESHOT,
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.mult = 1,
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.shift = 0,
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.min_delta_ns = 1250,
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.min_delta_ticks = 1250,
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.max_delta_ns = LONG_MAX,
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.max_delta_ticks = LONG_MAX,
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};
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static void numachip_timer_interrupt(void)
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{
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struct clock_event_device *ced = this_cpu_ptr(&numachip2_ced);
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ced->event_handler(ced);
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}
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static __init void numachip_timer_each(struct work_struct *work)
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{
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unsigned local_apicid = __this_cpu_read(x86_cpu_to_apicid) & 0xff;
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struct clock_event_device *ced = this_cpu_ptr(&numachip2_ced);
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/* Setup IPI vector to local core and relative timing mode */
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numachip2_write64_lcsr(NUMACHIP2_TIMER_INT + numachip2_timer(),
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(3 << 22) | (X86_PLATFORM_IPI_VECTOR << 14) |
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(local_apicid << 6));
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*ced = numachip2_clockevent;
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ced->cpumask = cpumask_of(smp_processor_id());
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clockevents_register_device(ced);
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}
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static int __init numachip_timer_init(void)
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{
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if (numachip_system != 2)
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return -ENODEV;
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/* Reset timer */
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numachip2_write64_lcsr(NUMACHIP2_TIMER_RESET, 0);
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clocksource_register_hz(&numachip2_clocksource, NSEC_PER_SEC);
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/* Setup per-cpu clockevents */
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x86_platform_ipi_callback = numachip_timer_interrupt;
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schedule_on_each_cpu(&numachip_timer_each);
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return 0;
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}
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arch_initcall(numachip_timer_init);
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