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