// SPDX-License-Identifier: GPL-2.0 /* * ip30-timer.c: Clocksource/clockevent support for the * HEART chip in SGI Octane (IP30) systems. * * Copyright (C) 2004-2007 Stanislaw Skowronek <skylark@unaligned.org> * Copyright (C) 2009 Johannes Dickgreber <tanzy@gmx.de> * Copyright (C) 2011 Joshua Kinard <kumba@gentoo.org> */ #include <linux/clocksource.h> #include <linux/cpumask.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/percpu.h> #include <linux/sched_clock.h> #include <asm/time.h> #include <asm/cevt-r4k.h> #include <asm/sgi/heart.h> static u64 ip30_heart_counter_read(struct clocksource *cs) { return heart_read(&heart_regs->count); } struct clocksource ip30_heart_clocksource = { .name = "HEART", .rating = 400, .read = ip30_heart_counter_read, .mask = CLOCKSOURCE_MASK(52), .flags = (CLOCK_SOURCE_IS_CONTINUOUS | CLOCK_SOURCE_VALID_FOR_HRES), }; static u64 notrace ip30_heart_read_sched_clock(void) { return heart_read(&heart_regs->count); } static void __init ip30_heart_clocksource_init(void) { struct clocksource *cs = &ip30_heart_clocksource; clocksource_register_hz(cs, HEART_CYCLES_PER_SEC); sched_clock_register(ip30_heart_read_sched_clock, 52, HEART_CYCLES_PER_SEC); } void __init plat_time_init(void) { int irq = get_c0_compare_int(); cp0_timer_irq_installed = 1; c0_compare_irqaction.percpu_dev_id = &mips_clockevent_device; c0_compare_irqaction.flags &= ~IRQF_SHARED; irq_set_handler(irq, handle_percpu_devid_irq); irq_set_percpu_devid(irq); setup_percpu_irq(irq, &c0_compare_irqaction); enable_percpu_irq(irq, IRQ_TYPE_NONE); ip30_heart_clocksource_init(); }