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88 lines
2.3 KiB
88 lines
2.3 KiB
// 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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