cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ip30-timer.c (1661B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * ip30-timer.c: Clocksource/clockevent support for the
      4 *               HEART chip in SGI Octane (IP30) systems.
      5 *
      6 * Copyright (C) 2004-2007 Stanislaw Skowronek <skylark@unaligned.org>
      7 * Copyright (C) 2009 Johannes Dickgreber <tanzy@gmx.de>
      8 * Copyright (C) 2011 Joshua Kinard <kumba@gentoo.org>
      9 */
     10
     11#include <linux/clocksource.h>
     12#include <linux/cpumask.h>
     13#include <linux/init.h>
     14#include <linux/kernel.h>
     15#include <linux/percpu.h>
     16#include <linux/sched_clock.h>
     17
     18#include <asm/time.h>
     19#include <asm/cevt-r4k.h>
     20#include <asm/sgi/heart.h>
     21
     22static u64 ip30_heart_counter_read(struct clocksource *cs)
     23{
     24	return heart_read(&heart_regs->count);
     25}
     26
     27struct clocksource ip30_heart_clocksource = {
     28	.name	= "HEART",
     29	.rating	= 400,
     30	.read	= ip30_heart_counter_read,
     31	.mask	= CLOCKSOURCE_MASK(52),
     32	.flags	= (CLOCK_SOURCE_IS_CONTINUOUS | CLOCK_SOURCE_VALID_FOR_HRES),
     33};
     34
     35static u64 notrace ip30_heart_read_sched_clock(void)
     36{
     37	return heart_read(&heart_regs->count);
     38}
     39
     40static void __init ip30_heart_clocksource_init(void)
     41{
     42	struct clocksource *cs = &ip30_heart_clocksource;
     43
     44	clocksource_register_hz(cs, HEART_CYCLES_PER_SEC);
     45
     46	sched_clock_register(ip30_heart_read_sched_clock, 52,
     47			     HEART_CYCLES_PER_SEC);
     48}
     49
     50void __init plat_time_init(void)
     51{
     52	int irq = get_c0_compare_int();
     53
     54	cp0_timer_irq_installed = 1;
     55	c0_compare_irqaction.percpu_dev_id = &mips_clockevent_device;
     56	c0_compare_irqaction.flags &= ~IRQF_SHARED;
     57	irq_set_handler(irq, handle_percpu_devid_irq);
     58	irq_set_percpu_devid(irq);
     59	setup_percpu_irq(irq, &c0_compare_irqaction);
     60	enable_percpu_irq(irq, IRQ_TYPE_NONE);
     61
     62	ip30_heart_clocksource_init();
     63}