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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
33unsigned long __nongprelbss __clkin_clock_speed_HZ;
34unsigned long __nongprelbss __ext_bus_clock_speed_HZ;
35unsigned long __nongprelbss __res_bus_clock_speed_HZ;
36unsigned long __nongprelbss __sdram_clock_speed_HZ;
37unsigned long __nongprelbss __core_bus_clock_speed_HZ;
38unsigned long __nongprelbss __core_clock_speed_HZ;
39unsigned long __nongprelbss __dsu_clock_speed_HZ;
40unsigned long __nongprelbss __serial_clock_speed_HZ;
41unsigned long __delay_loops_MHz;
42
43static irqreturn_t timer_interrupt(int irq, void *dummy);
44
45static 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 */
55static 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
72void 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
89void 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
109void 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 */
120unsigned long long sched_clock(void)
121{
122 return jiffies_64 * (1000000000 / HZ);
123}
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
33unsigned long __nongprelbss __clkin_clock_speed_HZ;
34unsigned long __nongprelbss __ext_bus_clock_speed_HZ;
35unsigned long __nongprelbss __res_bus_clock_speed_HZ;
36unsigned long __nongprelbss __sdram_clock_speed_HZ;
37unsigned long __nongprelbss __core_bus_clock_speed_HZ;
38unsigned long __nongprelbss __core_clock_speed_HZ;
39unsigned long __nongprelbss __dsu_clock_speed_HZ;
40unsigned long __nongprelbss __serial_clock_speed_HZ;
41unsigned long __delay_loops_MHz;
42
43static irqreturn_t timer_interrupt(int irq, void *dummy);
44
45static struct irqaction timer_irq = {
46 .handler = timer_interrupt,
47 .name = "timer",
48};
49
50/*
51 * timer_interrupt() needs to keep up the real-time clock,
52 * as well as call the "xtime_update()" routine every clocktick
53 */
54static irqreturn_t timer_interrupt(int irq, void *dummy)
55{
56 profile_tick(CPU_PROFILING);
57
58 xtime_update(1);
59
60#ifdef CONFIG_HEARTBEAT
61 static unsigned short n;
62 n++;
63 __set_LEDS(n);
64#endif /* CONFIG_HEARTBEAT */
65
66 update_process_times(user_mode(get_irq_regs()));
67
68 return IRQ_HANDLED;
69}
70
71void time_divisor_init(void)
72{
73 unsigned short base, pre, prediv;
74
75 /* set the scheduling timer going */
76 pre = 1;
77 prediv = 4;
78 base = __res_bus_clock_speed_HZ / pre / HZ / (1 << prediv);
79
80 __set_TPRV(pre);
81 __set_TxCKSL_DATA(0, prediv);
82 __set_TCTR(TCTR_SC_CTR0 | TCTR_RL_RW_LH8 | TCTR_MODE_2);
83 __set_TCSR_DATA(0, base & 0xff);
84 __set_TCSR_DATA(0, base >> 8);
85}
86
87
88void read_persistent_clock(struct timespec *ts)
89{
90 unsigned int year, mon, day, hour, min, sec;
91
92 extern void arch_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec);
93
94 /* FIX by dqg : Set to zero for platforms that don't have tod */
95 /* without this time is undefined and can overflow time_t, causing */
96 /* very strange errors */
97 year = 1980;
98 mon = day = 1;
99 hour = min = sec = 0;
100 arch_gettod (&year, &mon, &day, &hour, &min, &sec);
101
102 if ((year += 1900) < 1970)
103 year += 100;
104 ts->tv_sec = mktime(year, mon, day, hour, min, sec);
105 ts->tv_nsec = 0;
106}
107
108void time_init(void)
109{
110 /* install scheduling interrupt handler */
111 setup_irq(IRQ_CPU_TIMER0, &timer_irq);
112
113 time_divisor_init();
114}
115
116/*
117 * Scheduler clock - returns current time in nanosec units.
118 */
119unsigned long long sched_clock(void)
120{
121 return jiffies_64 * (1000000000 / HZ);
122}