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9#include <linux/bug.h>
10#include <linux/clockchips.h>
11#include <linux/types.h>
12#include <linux/kernel.h>
13#include <linux/init.h>
14#include <linux/sched.h>
15#include <linux/param.h>
16#include <linux/time.h>
17#include <linux/timex.h>
18#include <linux/smp.h>
19#include <linux/spinlock.h>
20#include <linux/export.h>
21#include <linux/cpufreq.h>
22#include <linux/delay.h>
23
24#include <asm/cpu-features.h>
25#include <asm/cpu-type.h>
26#include <asm/div64.h>
27#include <asm/time.h>
28
29#ifdef CONFIG_CPU_FREQ
30
31static DEFINE_PER_CPU(unsigned long, pcp_lpj_ref);
32static DEFINE_PER_CPU(unsigned long, pcp_lpj_ref_freq);
33static unsigned long glb_lpj_ref;
34static unsigned long glb_lpj_ref_freq;
35
36static int cpufreq_callback(struct notifier_block *nb,
37 unsigned long val, void *data)
38{
39 struct cpufreq_freqs *freq = data;
40 struct cpumask *cpus = freq->policy->cpus;
41 unsigned long lpj;
42 int cpu;
43
44
45
46
47
48 if (freq->flags & CPUFREQ_CONST_LOOPS)
49 return NOTIFY_OK;
50
51
52 if (!glb_lpj_ref) {
53 glb_lpj_ref = boot_cpu_data.udelay_val;
54 glb_lpj_ref_freq = freq->old;
55
56 for_each_online_cpu(cpu) {
57 per_cpu(pcp_lpj_ref, cpu) =
58 cpu_data[cpu].udelay_val;
59 per_cpu(pcp_lpj_ref_freq, cpu) = freq->old;
60 }
61 }
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63
64
65
66
67 if ((val == CPUFREQ_PRECHANGE && freq->old < freq->new) ||
68 (val == CPUFREQ_POSTCHANGE && freq->old > freq->new)) {
69 loops_per_jiffy = cpufreq_scale(glb_lpj_ref,
70 glb_lpj_ref_freq,
71 freq->new);
72
73 for_each_cpu(cpu, cpus) {
74 lpj = cpufreq_scale(per_cpu(pcp_lpj_ref, cpu),
75 per_cpu(pcp_lpj_ref_freq, cpu),
76 freq->new);
77 cpu_data[cpu].udelay_val = (unsigned int)lpj;
78 }
79 }
80
81 return NOTIFY_OK;
82}
83
84static struct notifier_block cpufreq_notifier = {
85 .notifier_call = cpufreq_callback,
86};
87
88static int __init register_cpufreq_notifier(void)
89{
90 return cpufreq_register_notifier(&cpufreq_notifier,
91 CPUFREQ_TRANSITION_NOTIFIER);
92}
93core_initcall(register_cpufreq_notifier);
94
95#endif
96
97
98
99
100DEFINE_SPINLOCK(rtc_lock);
101EXPORT_SYMBOL(rtc_lock);
102
103static int null_perf_irq(void)
104{
105 return 0;
106}
107
108int (*perf_irq)(void) = null_perf_irq;
109
110EXPORT_SYMBOL(perf_irq);
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122
123unsigned int mips_hpt_frequency;
124EXPORT_SYMBOL_GPL(mips_hpt_frequency);
125
126static __init int cpu_has_mfc0_count_bug(void)
127{
128 switch (current_cpu_type()) {
129 case CPU_R4000PC:
130 case CPU_R4000SC:
131 case CPU_R4000MC:
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136
137 return 1;
138
139 case CPU_R4400PC:
140 case CPU_R4400SC:
141 case CPU_R4400MC:
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147 return 1;
148 }
149
150 return 0;
151}
152
153void __init time_init(void)
154{
155 plat_time_init();
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164
165 if (mips_clockevent_init() != 0 || !cpu_has_mfc0_count_bug())
166 init_mips_clocksource();
167}
168