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Linux/arch/frv/kernel/time.c

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  1 /* time.c: FRV arch-specific time handling
  2  *
  3  * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  * - Derived from arch/m68k/kernel/time.c
  6  *
  7  * This program is free software; you can redistribute it and/or
  8  * modify it under the terms of the GNU General Public License
  9  * as published by the Free Software Foundation; either version
 10  * 2 of the License, or (at your option) any later version.
 11  */
 12 
 13 #include <linux/module.h>
 14 #include <linux/errno.h>
 15 #include <linux/sched.h>
 16 #include <linux/kernel.h>
 17 #include <linux/param.h>
 18 #include <linux/string.h>
 19 #include <linux/interrupt.h>
 20 #include <linux/profile.h>
 21 #include <linux/irq.h>
 22 #include <linux/mm.h>
 23 
 24 #include <asm/io.h>
 25 #include <asm/timer-regs.h>
 26 #include <asm/mb-regs.h>
 27 #include <asm/mb86943a.h>
 28 
 29 #include <linux/timex.h>
 30 
 31 #define TICK_SIZE (tick_nsec / 1000)
 32 
 33 unsigned long __nongprelbss __clkin_clock_speed_HZ;
 34 unsigned long __nongprelbss __ext_bus_clock_speed_HZ;
 35 unsigned long __nongprelbss __res_bus_clock_speed_HZ;
 36 unsigned long __nongprelbss __sdram_clock_speed_HZ;
 37 unsigned long __nongprelbss __core_bus_clock_speed_HZ;
 38 unsigned long __nongprelbss __core_clock_speed_HZ;
 39 unsigned long __nongprelbss __dsu_clock_speed_HZ;
 40 unsigned long __nongprelbss __serial_clock_speed_HZ;
 41 unsigned long __delay_loops_MHz;
 42 
 43 static irqreturn_t timer_interrupt(int irq, void *dummy);
 44 
 45 static struct irqaction timer_irq  = {
 46         .handler = timer_interrupt,
 47         .flags = IRQF_DISABLED,
 48         .name = "timer",
 49 };
 50 
 51 /*
 52  * timer_interrupt() needs to keep up the real-time clock,
 53  * as well as call the "xtime_update()" routine every clocktick
 54  */
 55 static irqreturn_t timer_interrupt(int irq, void *dummy)
 56 {
 57         profile_tick(CPU_PROFILING);
 58 
 59         xtime_update(1);
 60 
 61 #ifdef CONFIG_HEARTBEAT
 62         static unsigned short n;
 63         n++;
 64         __set_LEDS(n);
 65 #endif /* CONFIG_HEARTBEAT */
 66 
 67         update_process_times(user_mode(get_irq_regs()));
 68 
 69         return IRQ_HANDLED;
 70 }
 71 
 72 void time_divisor_init(void)
 73 {
 74         unsigned short base, pre, prediv;
 75 
 76         /* set the scheduling timer going */
 77         pre = 1;
 78         prediv = 4;
 79         base = __res_bus_clock_speed_HZ / pre / HZ / (1 << prediv);
 80 
 81         __set_TPRV(pre);
 82         __set_TxCKSL_DATA(0, prediv);
 83         __set_TCTR(TCTR_SC_CTR0 | TCTR_RL_RW_LH8 | TCTR_MODE_2);
 84         __set_TCSR_DATA(0, base & 0xff);
 85         __set_TCSR_DATA(0, base >> 8);
 86 }
 87 
 88 
 89 void read_persistent_clock(struct timespec *ts)
 90 {
 91         unsigned int year, mon, day, hour, min, sec;
 92 
 93         extern void arch_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec);
 94 
 95         /* FIX by dqg : Set to zero for platforms that don't have tod */
 96         /* without this time is undefined and can overflow time_t, causing  */
 97         /* very strange errors */
 98         year = 1980;
 99         mon = day = 1;
100         hour = min = sec = 0;
101         arch_gettod (&year, &mon, &day, &hour, &min, &sec);
102 
103         if ((year += 1900) < 1970)
104                 year += 100;
105         ts->tv_sec = mktime(year, mon, day, hour, min, sec);
106         ts->tv_nsec = 0;
107 }
108 
109 void time_init(void)
110 {
111         /* install scheduling interrupt handler */
112         setup_irq(IRQ_CPU_TIMER0, &timer_irq);
113 
114         time_divisor_init();
115 }
116 
117 /*
118  * Scheduler clock - returns current time in nanosec units.
119  */
120 unsigned long long sched_clock(void)
121 {
122         return jiffies_64 * (1000000000 / HZ);
123 }
124 

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