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fa7f9e7f GU |
1 | /* |
2 | * linux/arch/m68k/kernel/time.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992, 1995 Linus Torvalds | |
5 | * | |
6 | * This file contains the m68k-specific time handling details. | |
7 | * Most of the stuff is located in the machine specific files. | |
8 | * | |
9 | * 1997-09-10 Updated NTP code according to technical memorandum Jan '96 | |
10 | * "A Kernel Model for Precision Timekeeping" by Dave Mills | |
11 | */ | |
12 | ||
13 | #include <linux/errno.h> | |
5bc8c7cd | 14 | #include <linux/export.h> |
fa7f9e7f GU |
15 | #include <linux/module.h> |
16 | #include <linux/sched.h> | |
4f17722c | 17 | #include <linux/sched/loadavg.h> |
fa7f9e7f GU |
18 | #include <linux/kernel.h> |
19 | #include <linux/param.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/rtc.h> | |
23 | #include <linux/platform_device.h> | |
24 | ||
25 | #include <asm/machdep.h> | |
26 | #include <asm/io.h> | |
27 | #include <asm/irq_regs.h> | |
28 | ||
29 | #include <linux/time.h> | |
30 | #include <linux/timex.h> | |
31 | #include <linux/profile.h> | |
32 | ||
017cecee GU |
33 | |
34 | unsigned long (*mach_random_get_entropy)(void); | |
5bc8c7cd | 35 | EXPORT_SYMBOL_GPL(mach_random_get_entropy); |
017cecee GU |
36 | |
37 | ||
fa7f9e7f GU |
38 | /* |
39 | * timer_interrupt() needs to keep up the real-time clock, | |
40 | * as well as call the "xtime_update()" routine every clocktick | |
41 | */ | |
42 | static irqreturn_t timer_interrupt(int irq, void *dummy) | |
43 | { | |
44 | xtime_update(1); | |
45 | update_process_times(user_mode(get_irq_regs())); | |
46 | profile_tick(CPU_PROFILING); | |
47 | ||
48 | #ifdef CONFIG_HEARTBEAT | |
49 | /* use power LED as a heartbeat instead -- much more useful | |
50 | for debugging -- based on the version for PReP by Cort */ | |
51 | /* acts like an actual heart beat -- ie thump-thump-pause... */ | |
52 | if (mach_heartbeat) { | |
53 | static unsigned cnt = 0, period = 0, dist = 0; | |
54 | ||
55 | if (cnt == 0 || cnt == dist) | |
56 | mach_heartbeat( 1 ); | |
57 | else if (cnt == 7 || cnt == dist+7) | |
58 | mach_heartbeat( 0 ); | |
59 | ||
60 | if (++cnt > period) { | |
61 | cnt = 0; | |
62 | /* The hyperbolic function below modifies the heartbeat period | |
63 | * length in dependency of the current (5min) load. It goes | |
64 | * through the points f(0)=126, f(1)=86, f(5)=51, | |
65 | * f(inf)->30. */ | |
66 | period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30; | |
67 | dist = period / 4; | |
68 | } | |
69 | } | |
70 | #endif /* CONFIG_HEARTBEAT */ | |
71 | return IRQ_HANDLED; | |
72 | } | |
73 | ||
74 | void read_persistent_clock(struct timespec *ts) | |
75 | { | |
76 | struct rtc_time time; | |
77 | ts->tv_sec = 0; | |
78 | ts->tv_nsec = 0; | |
79 | ||
80 | if (mach_hwclk) { | |
81 | mach_hwclk(0, &time); | |
82 | ||
83 | if ((time.tm_year += 1900) < 1970) | |
84 | time.tm_year += 100; | |
85 | ts->tv_sec = mktime(time.tm_year, time.tm_mon, time.tm_mday, | |
86 | time.tm_hour, time.tm_min, time.tm_sec); | |
87 | } | |
88 | } | |
89 | ||
923c904c AB |
90 | #if defined(CONFIG_ARCH_USES_GETTIMEOFFSET) && IS_ENABLED(CONFIG_RTC_DRV_GENERIC) |
91 | static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm) | |
92 | { | |
93 | mach_hwclk(0, tm); | |
94 | return rtc_valid_tm(tm); | |
95 | } | |
96 | ||
97 | static int rtc_generic_set_time(struct device *dev, struct rtc_time *tm) | |
98 | { | |
99 | if (mach_hwclk(1, tm) < 0) | |
100 | return -EOPNOTSUPP; | |
101 | return 0; | |
102 | } | |
103 | ||
598e8a1f AB |
104 | static int rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) |
105 | { | |
106 | struct rtc_pll_info pll; | |
107 | struct rtc_pll_info __user *argp = (void __user *)arg; | |
108 | ||
109 | switch (cmd) { | |
110 | case RTC_PLL_GET: | |
111 | if (!mach_get_rtc_pll || mach_get_rtc_pll(&pll)) | |
112 | return -EINVAL; | |
113 | return copy_to_user(argp, &pll, sizeof pll) ? -EFAULT : 0; | |
114 | ||
115 | case RTC_PLL_SET: | |
116 | if (!mach_set_rtc_pll) | |
117 | return -EINVAL; | |
118 | if (!capable(CAP_SYS_TIME)) | |
119 | return -EACCES; | |
120 | if (copy_from_user(&pll, argp, sizeof(pll))) | |
121 | return -EFAULT; | |
122 | return mach_set_rtc_pll(&pll); | |
123 | } | |
124 | ||
125 | return -ENOIOCTLCMD; | |
126 | } | |
127 | ||
923c904c | 128 | static const struct rtc_class_ops generic_rtc_ops = { |
598e8a1f | 129 | .ioctl = rtc_ioctl, |
923c904c AB |
130 | .read_time = rtc_generic_get_time, |
131 | .set_time = rtc_generic_set_time, | |
132 | }; | |
fa7f9e7f | 133 | |
fa7f9e7f GU |
134 | static int __init rtc_init(void) |
135 | { | |
136 | struct platform_device *pdev; | |
137 | ||
138 | if (!mach_hwclk) | |
139 | return -ENODEV; | |
140 | ||
923c904c AB |
141 | pdev = platform_device_register_data(NULL, "rtc-generic", -1, |
142 | &generic_rtc_ops, | |
143 | sizeof(generic_rtc_ops)); | |
8c6ffba0 | 144 | return PTR_ERR_OR_ZERO(pdev); |
fa7f9e7f GU |
145 | } |
146 | ||
147 | module_init(rtc_init); | |
148 | ||
b13b3f51 | 149 | #endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */ |
7b1f6207 SW |
150 | |
151 | void __init time_init(void) | |
152 | { | |
7b1f6207 SW |
153 | mach_sched_init(timer_interrupt); |
154 | } |