161 lines
4.1 KiB
C
161 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 1999, 2000, 05, 06 Ralf Baechle (ralf@linux-mips.org)
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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*/
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#include <linux/bcd.h>
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#include <linux/clockchips.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/sched_clock.h>
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#include <linux/interrupt.h>
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#include <linux/kernel_stat.h>
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#include <linux/param.h>
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#include <linux/smp.h>
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#include <linux/time.h>
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#include <linux/timex.h>
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#include <linux/mm.h>
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#include <linux/platform_device.h>
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#include <asm/time.h>
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#include <asm/sgialib.h>
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#include <asm/sn/klconfig.h>
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#include <asm/sn/arch.h>
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#include <asm/sn/addrs.h>
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#include <asm/sn/agent.h>
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#include "ip27-common.h"
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static int rt_next_event(unsigned long delta, struct clock_event_device *evt)
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{
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unsigned int cpu = smp_processor_id();
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int slice = cputoslice(cpu);
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unsigned long cnt;
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cnt = LOCAL_HUB_L(PI_RT_COUNT);
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cnt += delta;
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LOCAL_HUB_S(PI_RT_COMPARE_A + PI_COUNT_OFFSET * slice, cnt);
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return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0;
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}
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static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent);
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static DEFINE_PER_CPU(char [11], hub_rt_name);
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static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id)
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{
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unsigned int cpu = smp_processor_id();
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struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
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int slice = cputoslice(cpu);
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/*
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* Ack
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*/
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LOCAL_HUB_S(PI_RT_PEND_A + PI_COUNT_OFFSET * slice, 0);
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cd->event_handler(cd);
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return IRQ_HANDLED;
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}
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struct irqaction hub_rt_irqaction = {
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.handler = hub_rt_counter_handler,
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.percpu_dev_id = &hub_rt_clockevent,
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.flags = IRQF_PERCPU | IRQF_TIMER,
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.name = "hub-rt",
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};
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/*
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* This is a hack; we really need to figure these values out dynamically
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*
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* Since 800 ns works very well with various HUB frequencies, such as
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* 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time.
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*
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* Ralf: which clock rate is used to feed the counter?
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*/
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#define NSEC_PER_CYCLE 800
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#define CYCLES_PER_SEC (NSEC_PER_SEC / NSEC_PER_CYCLE)
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void hub_rt_clock_event_init(void)
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{
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unsigned int cpu = smp_processor_id();
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struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
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unsigned char *name = per_cpu(hub_rt_name, cpu);
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sprintf(name, "hub-rt %d", cpu);
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cd->name = name;
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cd->features = CLOCK_EVT_FEAT_ONESHOT;
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clockevent_set_clock(cd, CYCLES_PER_SEC);
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cd->max_delta_ns = clockevent_delta2ns(0xfffffffffffff, cd);
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cd->max_delta_ticks = 0xfffffffffffff;
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cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
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cd->min_delta_ticks = 0x300;
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cd->rating = 200;
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cd->irq = IP27_RT_TIMER_IRQ;
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cd->cpumask = cpumask_of(cpu);
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cd->set_next_event = rt_next_event;
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clockevents_register_device(cd);
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enable_percpu_irq(IP27_RT_TIMER_IRQ, IRQ_TYPE_NONE);
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}
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static void __init hub_rt_clock_event_global_init(void)
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{
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irq_set_handler(IP27_RT_TIMER_IRQ, handle_percpu_devid_irq);
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irq_set_percpu_devid(IP27_RT_TIMER_IRQ);
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setup_percpu_irq(IP27_RT_TIMER_IRQ, &hub_rt_irqaction);
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}
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static u64 hub_rt_read(struct clocksource *cs)
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{
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return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
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}
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struct clocksource hub_rt_clocksource = {
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.name = "HUB-RT",
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.rating = 200,
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.read = hub_rt_read,
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.mask = CLOCKSOURCE_MASK(52),
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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};
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static u64 notrace hub_rt_read_sched_clock(void)
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{
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return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
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}
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static void __init hub_rt_clocksource_init(void)
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{
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struct clocksource *cs = &hub_rt_clocksource;
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clocksource_register_hz(cs, CYCLES_PER_SEC);
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sched_clock_register(hub_rt_read_sched_clock, 52, 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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hub_rt_clocksource_init();
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hub_rt_clock_event_global_init();
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hub_rt_clock_event_init();
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}
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void hub_rtc_init(nasid_t nasid)
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{
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/*
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* We only need to initialize the current node.
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* If this is not the current node then it is a cpuless
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* node and timeouts will not happen there.
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*/
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if (get_nasid() == nasid) {
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LOCAL_HUB_S(PI_RT_EN_A, 1);
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LOCAL_HUB_S(PI_RT_EN_B, 1);
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LOCAL_HUB_S(PI_PROF_EN_A, 0);
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LOCAL_HUB_S(PI_PROF_EN_B, 0);
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LOCAL_HUB_S(PI_RT_COUNT, 0);
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LOCAL_HUB_S(PI_RT_PEND_A, 0);
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LOCAL_HUB_S(PI_RT_PEND_B, 0);
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}
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}
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