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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/arch/m68k/kernel/time.c
4 *
5 * Copyright (C) 1991, 1992, 1995 Linus Torvalds
6 *
7 * This file contains the m68k-specific time handling details.
8 * Most of the stuff is located in the machine specific files.
9 *
10 * 1997-09-10 Updated NTP code according to technical memorandum Jan '96
11 * "A Kernel Model for Precision Timekeeping" by Dave Mills
12 */
13
14#include <linux/errno.h>
15#include <linux/export.h>
16#include <linux/module.h>
17#include <linux/sched.h>
18#include <linux/sched/loadavg.h>
19#include <linux/kernel.h>
20#include <linux/param.h>
21#include <linux/string.h>
22#include <linux/mm.h>
23#include <linux/rtc.h>
24#include <linux/platform_device.h>
25
26#include <asm/machdep.h>
27#include <asm/io.h>
28#include <asm/irq_regs.h>
29
30#include <linux/time.h>
31#include <linux/timex.h>
32#include <linux/profile.h>
33
34
35unsigned long (*mach_random_get_entropy)(void);
36EXPORT_SYMBOL_GPL(mach_random_get_entropy);
37
38#ifdef CONFIG_HEARTBEAT
39void timer_heartbeat(void)
40{
41 /* use power LED as a heartbeat instead -- much more useful
42 for debugging -- based on the version for PReP by Cort */
43 /* acts like an actual heart beat -- ie thump-thump-pause... */
44 if (mach_heartbeat) {
45 static unsigned cnt = 0, period = 0, dist = 0;
46
47 if (cnt == 0 || cnt == dist)
48 mach_heartbeat( 1 );
49 else if (cnt == 7 || cnt == dist+7)
50 mach_heartbeat( 0 );
51
52 if (++cnt > period) {
53 cnt = 0;
54 /* The hyperbolic function below modifies the heartbeat period
55 * length in dependency of the current (5min) load. It goes
56 * through the points f(0)=126, f(1)=86, f(5)=51,
57 * f(inf)->30. */
58 period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30;
59 dist = period / 4;
60 }
61 }
62}
63#endif /* CONFIG_HEARTBEAT */
64
65#ifdef CONFIG_M68KCLASSIC
66/* machine dependent timer functions */
67int (*mach_hwclk) (int, struct rtc_time*);
68EXPORT_SYMBOL(mach_hwclk);
69
70int (*mach_get_rtc_pll)(struct rtc_pll_info *);
71int (*mach_set_rtc_pll)(struct rtc_pll_info *);
72EXPORT_SYMBOL(mach_get_rtc_pll);
73EXPORT_SYMBOL(mach_set_rtc_pll);
74
75#if !IS_BUILTIN(CONFIG_RTC_DRV_GENERIC)
76void read_persistent_clock64(struct timespec64 *ts)
77{
78 struct rtc_time time;
79
80 ts->tv_sec = 0;
81 ts->tv_nsec = 0;
82
83 if (!mach_hwclk)
84 return;
85
86 mach_hwclk(0, &time);
87
88 ts->tv_sec = mktime64(time.tm_year + 1900, time.tm_mon + 1, time.tm_mday,
89 time.tm_hour, time.tm_min, time.tm_sec);
90}
91#endif
92
93#if IS_ENABLED(CONFIG_RTC_DRV_GENERIC)
94static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm)
95{
96 mach_hwclk(0, tm);
97 return 0;
98}
99
100static int rtc_generic_set_time(struct device *dev, struct rtc_time *tm)
101{
102 if (mach_hwclk(1, tm) < 0)
103 return -EOPNOTSUPP;
104 return 0;
105}
106
107static int rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
108{
109 struct rtc_pll_info pll;
110 struct rtc_pll_info __user *argp = (void __user *)arg;
111
112 switch (cmd) {
113 case RTC_PLL_GET:
114 if (!mach_get_rtc_pll || mach_get_rtc_pll(&pll))
115 return -EINVAL;
116 return copy_to_user(argp, &pll, sizeof pll) ? -EFAULT : 0;
117
118 case RTC_PLL_SET:
119 if (!mach_set_rtc_pll)
120 return -EINVAL;
121 if (!capable(CAP_SYS_TIME))
122 return -EACCES;
123 if (copy_from_user(&pll, argp, sizeof(pll)))
124 return -EFAULT;
125 return mach_set_rtc_pll(&pll);
126 }
127
128 return -ENOIOCTLCMD;
129}
130
131static const struct rtc_class_ops generic_rtc_ops = {
132 .ioctl = rtc_ioctl,
133 .read_time = rtc_generic_get_time,
134 .set_time = rtc_generic_set_time,
135};
136
137static int __init rtc_init(void)
138{
139 struct platform_device *pdev;
140
141 if (!mach_hwclk)
142 return -ENODEV;
143
144 pdev = platform_device_register_data(NULL, "rtc-generic", -1,
145 &generic_rtc_ops,
146 sizeof(generic_rtc_ops));
147 return PTR_ERR_OR_ZERO(pdev);
148}
149
150module_init(rtc_init);
151#endif /* CONFIG_RTC_DRV_GENERIC */
152#endif /* CONFIG M68KCLASSIC */
153
154void __init time_init(void)
155{
156 mach_sched_init();
157}
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>
14#include <linux/export.h>
15#include <linux/module.h>
16#include <linux/sched.h>
17#include <linux/sched/loadavg.h>
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
33
34unsigned long (*mach_random_get_entropy)(void);
35EXPORT_SYMBOL_GPL(mach_random_get_entropy);
36
37
38/*
39 * timer_interrupt() needs to keep up the real-time clock,
40 * as well as call the "xtime_update()" routine every clocktick
41 */
42static 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
74void 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
90#if defined(CONFIG_ARCH_USES_GETTIMEOFFSET) && IS_ENABLED(CONFIG_RTC_DRV_GENERIC)
91static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm)
92{
93 mach_hwclk(0, tm);
94 return 0;
95}
96
97static 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
104static 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
128static const struct rtc_class_ops generic_rtc_ops = {
129 .ioctl = rtc_ioctl,
130 .read_time = rtc_generic_get_time,
131 .set_time = rtc_generic_set_time,
132};
133
134static int __init rtc_init(void)
135{
136 struct platform_device *pdev;
137
138 if (!mach_hwclk)
139 return -ENODEV;
140
141 pdev = platform_device_register_data(NULL, "rtc-generic", -1,
142 &generic_rtc_ops,
143 sizeof(generic_rtc_ops));
144 return PTR_ERR_OR_ZERO(pdev);
145}
146
147module_init(rtc_init);
148
149#endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */
150
151void __init time_init(void)
152{
153 mach_sched_init(timer_interrupt);
154}