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Linux/arch/mn10300/kernel/cevt-mn10300.c

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  1 /* MN10300 clockevents
  2  *
  3  * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
  4  * Written by Mark Salter (msalter@redhat.com)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public Licence
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the Licence, or (at your option) any later version.
 10  */
 11 #include <linux/clockchips.h>
 12 #include <linux/interrupt.h>
 13 #include <linux/percpu.h>
 14 #include <linux/smp.h>
 15 #include <asm/timex.h>
 16 #include "internal.h"
 17 
 18 #ifdef CONFIG_SMP
 19 #if (CONFIG_NR_CPUS > 2) && !defined(CONFIG_GEENERIC_CLOCKEVENTS_BROADCAST)
 20 #error "This doesn't scale well! Need per-core local timers."
 21 #endif
 22 #else /* CONFIG_SMP */
 23 #define stop_jiffies_counter1()
 24 #define reload_jiffies_counter1(x)
 25 #define TMJC1IRQ TMJCIRQ
 26 #endif
 27 
 28 
 29 static int next_event(unsigned long delta,
 30                       struct clock_event_device *evt)
 31 {
 32         unsigned int cpu = smp_processor_id();
 33 
 34         if (cpu == 0) {
 35                 stop_jiffies_counter();
 36                 reload_jiffies_counter(delta - 1);
 37         } else {
 38                 stop_jiffies_counter1();
 39                 reload_jiffies_counter1(delta - 1);
 40         }
 41         return 0;
 42 }
 43 
 44 static DEFINE_PER_CPU(struct clock_event_device, mn10300_clockevent_device);
 45 static DEFINE_PER_CPU(struct irqaction, timer_irq);
 46 
 47 static irqreturn_t timer_interrupt(int irq, void *dev_id)
 48 {
 49         struct clock_event_device *cd;
 50         unsigned int cpu = smp_processor_id();
 51 
 52         if (cpu == 0)
 53                 stop_jiffies_counter();
 54         else
 55                 stop_jiffies_counter1();
 56 
 57         cd = &per_cpu(mn10300_clockevent_device, cpu);
 58         cd->event_handler(cd);
 59 
 60         return IRQ_HANDLED;
 61 }
 62 
 63 static void event_handler(struct clock_event_device *dev)
 64 {
 65 }
 66 
 67 static inline void setup_jiffies_interrupt(int irq,
 68                                            struct irqaction *action)
 69 {
 70         u16 tmp;
 71         setup_irq(irq, action);
 72         set_intr_level(irq, NUM2GxICR_LEVEL(CONFIG_TIMER_IRQ_LEVEL));
 73         GxICR(irq) |= GxICR_ENABLE | GxICR_DETECT | GxICR_REQUEST;
 74         tmp = GxICR(irq);
 75 }
 76 
 77 int __init init_clockevents(void)
 78 {
 79         struct clock_event_device *cd;
 80         struct irqaction *iact;
 81         unsigned int cpu = smp_processor_id();
 82 
 83         cd = &per_cpu(mn10300_clockevent_device, cpu);
 84 
 85         if (cpu == 0) {
 86                 stop_jiffies_counter();
 87                 cd->irq = TMJCIRQ;
 88         } else {
 89                 stop_jiffies_counter1();
 90                 cd->irq = TMJC1IRQ;
 91         }
 92 
 93         cd->name                = "Timestamp";
 94         cd->features            = CLOCK_EVT_FEAT_ONESHOT;
 95 
 96         /* Calculate shift/mult. We want to spawn at least 1 second */
 97         clockevents_calc_mult_shift(cd, MN10300_JCCLK, 1);
 98 
 99         /* Calculate the min / max delta */
100         cd->max_delta_ns        = clockevent_delta2ns(TMJCBR_MAX, cd);
101         cd->max_delta_ticks     = TMJCBR_MAX;
102         cd->min_delta_ns        = clockevent_delta2ns(100, cd);
103         cd->min_delta_ticks     = 100;
104 
105         cd->rating              = 200;
106         cd->cpumask             = cpumask_of(smp_processor_id());
107         cd->event_handler       = event_handler;
108         cd->set_next_event      = next_event;
109 
110         iact = &per_cpu(timer_irq, cpu);
111         iact->flags = IRQF_SHARED | IRQF_TIMER;
112         iact->handler = timer_interrupt;
113 
114         clockevents_register_device(cd);
115 
116 #if defined(CONFIG_SMP) && !defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST)
117         /* setup timer irq affinity so it only runs on this cpu */
118         {
119                 struct irq_data *data;
120                 data = irq_get_irq_data(cd->irq);
121                 cpumask_copy(irq_data_get_affinity_mask(data), cpumask_of(cpu));
122                 iact->flags |= IRQF_NOBALANCING;
123         }
124 #endif
125 
126         if (cpu == 0) {
127                 reload_jiffies_counter(MN10300_JC_PER_HZ - 1);
128                 iact->name = "CPU0 Timer";
129         } else {
130                 reload_jiffies_counter1(MN10300_JC_PER_HZ - 1);
131                 iact->name = "CPU1 Timer";
132         }
133 
134         setup_jiffies_interrupt(cd->irq, iact);
135 
136         return 0;
137 }
138 

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