// SPDX-License-Identifier: GPL-2.0-only/* * * Copyright (C) 2015 Numascale AS. All rights reserved. */ #include <linux/clockchips.h> #include <asm/irq.h>#include <asm/numachip/numachip.h>#include <asm/numachip/numachip_csr.h> static DEFINE_PER_CPU(struct clock_event_device, numachip2_ced); static cycles_t numachip2_timer_read(struct clocksource *cs){	return numachip2_read64_lcsr(NUMACHIP2_TIMER_NOW);} static struct clocksource numachip2_clocksource = {	.name            = "numachip2",	.rating          = 295,	.read            = numachip2_timer_read,	.mask            = CLOCKSOURCE_MASK(64),	.flags           = CLOCK_SOURCE_IS_CONTINUOUS,	.mult            = 1,	.shift           = 0,}; static int numachip2_set_next_event(unsigned long delta, struct clock_event_device *ced){	numachip2_write64_lcsr(NUMACHIP2_TIMER_DEADLINE + numachip2_timer(),		delta);	return 0;} static const struct clock_event_device numachip2_clockevent __initconst = {	.name            = "numachip2",	.rating          = 400,	.set_next_event  = numachip2_set_next_event,	.features        = CLOCK_EVT_FEAT_ONESHOT,	.mult            = 1,	.shift           = 0,	.min_delta_ns    = 1250,	.min_delta_ticks = 1250,	.max_delta_ns    = LONG_MAX,	.max_delta_ticks = LONG_MAX,}; static void numachip_timer_interrupt(void){	struct clock_event_device *ced = this_cpu_ptr(&numachip2_ced); 	ced->event_handler(ced);} static __init void numachip_timer_each(struct work_struct *work){	unsigned local_apicid = __this_cpu_read(x86_cpu_to_apicid) & 0xff;	struct clock_event_device *ced = this_cpu_ptr(&numachip2_ced); 	/* Setup IPI vector to local core and relative timing mode */	numachip2_write64_lcsr(NUMACHIP2_TIMER_INT + numachip2_timer(),		(3 << 22) | (X86_PLATFORM_IPI_VECTOR << 14) |		(local_apicid << 6)); 	*ced = numachip2_clockevent;	ced->cpumask = cpumask_of(smp_processor_id());	clockevents_register_device(ced);} static int __init numachip_timer_init(void){	if (numachip_system != 2)		return -ENODEV; 	/* Reset timer */	numachip2_write64_lcsr(NUMACHIP2_TIMER_RESET, 0);	clocksource_register_hz(&numachip2_clocksource, NSEC_PER_SEC); 	/* Setup per-cpu clockevents */	x86_platform_ipi_callback = numachip_timer_interrupt;	schedule_on_each_cpu(&numachip_timer_each); 	return 0;} arch_initcall(numachip_timer_init);