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1da177e4 LT |
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 | ||
1da177e4 LT |
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> | |
1da177e4 LT |
28 | |
29 | #include <linux/timex.h> | |
30 | ||
31 | #define TICK_SIZE (tick_nsec / 1000) | |
32 | ||
1da177e4 LT |
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 | ||
7d12e780 | 43 | static irqreturn_t timer_interrupt(int irq, void *dummy); |
1da177e4 LT |
44 | |
45 | static struct irqaction timer_irq = { | |
a2e170ea | 46 | .handler = timer_interrupt, |
a2e170ea | 47 | .name = "timer", |
1da177e4 LT |
48 | }; |
49 | ||
1da177e4 LT |
50 | /* |
51 | * timer_interrupt() needs to keep up the real-time clock, | |
57464bd8 | 52 | * as well as call the "xtime_update()" routine every clocktick |
1da177e4 | 53 | */ |
7d12e780 | 54 | static irqreturn_t timer_interrupt(int irq, void *dummy) |
1da177e4 | 55 | { |
aa02cd2d | 56 | profile_tick(CPU_PROFILING); |
1da177e4 | 57 | |
57464bd8 | 58 | xtime_update(1); |
1da177e4 | 59 | |
1da177e4 LT |
60 | #ifdef CONFIG_HEARTBEAT |
61 | static unsigned short n; | |
62 | n++; | |
63 | __set_LEDS(n); | |
64 | #endif /* CONFIG_HEARTBEAT */ | |
65 | ||
aa02cd2d PZ |
66 | update_process_times(user_mode(get_irq_regs())); |
67 | ||
1da177e4 LT |
68 | return IRQ_HANDLED; |
69 | } | |
70 | ||
71 | void 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 | ||
739b2711 JS |
87 | |
88 | void read_persistent_clock(struct timespec *ts) | |
1da177e4 LT |
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 */ | |
761a7e35 | 96 | /* very strange errors */ |
1da177e4 LT |
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; | |
739b2711 JS |
104 | ts->tv_sec = mktime(year, mon, day, hour, min, sec); |
105 | ts->tv_nsec = 0; | |
106 | } | |
1da177e4 | 107 | |
739b2711 JS |
108 | void time_init(void) |
109 | { | |
1da177e4 LT |
110 | /* install scheduling interrupt handler */ |
111 | setup_irq(IRQ_CPU_TIMER0, &timer_irq); | |
112 | ||
113 | time_divisor_init(); | |
114 | } | |
115 | ||
1da177e4 LT |
116 | /* |
117 | * Scheduler clock - returns current time in nanosec units. | |
118 | */ | |
119 | unsigned long long sched_clock(void) | |
120 | { | |
121 | return jiffies_64 * (1000000000 / HZ); | |
122 | } |