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Linux/arch/mips/sgi-ip27/ip27-timer.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Copyright (C) 1999, 2000, 05, 06 Ralf Baechle (ralf@linux-mips.org)
  4  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
  5  */
  6 #include <linux/bcd.h>
  7 #include <linux/clockchips.h>
  8 #include <linux/init.h>
  9 #include <linux/kernel.h>
 10 #include <linux/sched.h>
 11 #include <linux/sched_clock.h>
 12 #include <linux/interrupt.h>
 13 #include <linux/kernel_stat.h>
 14 #include <linux/param.h>
 15 #include <linux/smp.h>
 16 #include <linux/time.h>
 17 #include <linux/timex.h>
 18 #include <linux/mm.h>
 19 #include <linux/platform_device.h>
 20 
 21 #include <asm/time.h>
 22 #include <asm/sgialib.h>
 23 #include <asm/sn/klconfig.h>
 24 #include <asm/sn/arch.h>
 25 #include <asm/sn/addrs.h>
 26 #include <asm/sn/agent.h>
 27 
 28 #include "ip27-common.h"
 29 
 30 static int rt_next_event(unsigned long delta, struct clock_event_device *evt)
 31 {
 32         unsigned int cpu = smp_processor_id();
 33         int slice = cputoslice(cpu);
 34         unsigned long cnt;
 35 
 36         cnt = LOCAL_HUB_L(PI_RT_COUNT);
 37         cnt += delta;
 38         LOCAL_HUB_S(PI_RT_COMPARE_A + PI_COUNT_OFFSET * slice, cnt);
 39 
 40         return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0;
 41 }
 42 
 43 static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent);
 44 static DEFINE_PER_CPU(char [11], hub_rt_name);
 45 
 46 static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id)
 47 {
 48         unsigned int cpu = smp_processor_id();
 49         struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
 50         int slice = cputoslice(cpu);
 51 
 52         /*
 53          * Ack
 54          */
 55         LOCAL_HUB_S(PI_RT_PEND_A + PI_COUNT_OFFSET * slice, 0);
 56         cd->event_handler(cd);
 57 
 58         return IRQ_HANDLED;
 59 }
 60 
 61 struct irqaction hub_rt_irqaction = {
 62         .handler        = hub_rt_counter_handler,
 63         .percpu_dev_id  = &hub_rt_clockevent,
 64         .flags          = IRQF_PERCPU | IRQF_TIMER,
 65         .name           = "hub-rt",
 66 };
 67 
 68 /*
 69  * This is a hack; we really need to figure these values out dynamically
 70  *
 71  * Since 800 ns works very well with various HUB frequencies, such as
 72  * 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time.
 73  *
 74  * Ralf: which clock rate is used to feed the counter?
 75  */
 76 #define NSEC_PER_CYCLE          800
 77 #define CYCLES_PER_SEC          (NSEC_PER_SEC / NSEC_PER_CYCLE)
 78 
 79 void hub_rt_clock_event_init(void)
 80 {
 81         unsigned int cpu = smp_processor_id();
 82         struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
 83         unsigned char *name = per_cpu(hub_rt_name, cpu);
 84 
 85         sprintf(name, "hub-rt %d", cpu);
 86         cd->name                = name;
 87         cd->features            = CLOCK_EVT_FEAT_ONESHOT;
 88         clockevent_set_clock(cd, CYCLES_PER_SEC);
 89         cd->max_delta_ns        = clockevent_delta2ns(0xfffffffffffff, cd);
 90         cd->max_delta_ticks     = 0xfffffffffffff;
 91         cd->min_delta_ns        = clockevent_delta2ns(0x300, cd);
 92         cd->min_delta_ticks     = 0x300;
 93         cd->rating              = 200;
 94         cd->irq                 = IP27_RT_TIMER_IRQ;
 95         cd->cpumask             = cpumask_of(cpu);
 96         cd->set_next_event      = rt_next_event;
 97         clockevents_register_device(cd);
 98 
 99         enable_percpu_irq(IP27_RT_TIMER_IRQ, IRQ_TYPE_NONE);
100 }
101 
102 static void __init hub_rt_clock_event_global_init(void)
103 {
104         irq_set_handler(IP27_RT_TIMER_IRQ, handle_percpu_devid_irq);
105         irq_set_percpu_devid(IP27_RT_TIMER_IRQ);
106         setup_percpu_irq(IP27_RT_TIMER_IRQ, &hub_rt_irqaction);
107 }
108 
109 static u64 hub_rt_read(struct clocksource *cs)
110 {
111         return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
112 }
113 
114 struct clocksource hub_rt_clocksource = {
115         .name   = "HUB-RT",
116         .rating = 200,
117         .read   = hub_rt_read,
118         .mask   = CLOCKSOURCE_MASK(52),
119         .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
120 };
121 
122 static u64 notrace hub_rt_read_sched_clock(void)
123 {
124         return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
125 }
126 
127 static void __init hub_rt_clocksource_init(void)
128 {
129         struct clocksource *cs = &hub_rt_clocksource;
130 
131         clocksource_register_hz(cs, CYCLES_PER_SEC);
132 
133         sched_clock_register(hub_rt_read_sched_clock, 52, CYCLES_PER_SEC);
134 }
135 
136 void __init plat_time_init(void)
137 {
138         hub_rt_clocksource_init();
139         hub_rt_clock_event_global_init();
140         hub_rt_clock_event_init();
141 }
142 
143 void hub_rtc_init(nasid_t nasid)
144 {
145 
146         /*
147          * We only need to initialize the current node.
148          * If this is not the current node then it is a cpuless
149          * node and timeouts will not happen there.
150          */
151         if (get_nasid() == nasid) {
152                 LOCAL_HUB_S(PI_RT_EN_A, 1);
153                 LOCAL_HUB_S(PI_RT_EN_B, 1);
154                 LOCAL_HUB_S(PI_PROF_EN_A, 0);
155                 LOCAL_HUB_S(PI_PROF_EN_B, 0);
156                 LOCAL_HUB_S(PI_RT_COUNT, 0);
157                 LOCAL_HUB_S(PI_RT_PEND_A, 0);
158                 LOCAL_HUB_S(PI_RT_PEND_B, 0);
159         }
160 }
161 

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