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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
39/*
40 * timer_interrupt() needs to keep up the real-time clock,
41 * as well as call the "xtime_update()" routine every clocktick
42 */
43static irqreturn_t timer_interrupt(int irq, void *dummy)
44{
45 xtime_update(1);
46 update_process_times(user_mode(get_irq_regs()));
47 profile_tick(CPU_PROFILING);
48
49#ifdef CONFIG_HEARTBEAT
50 /* use power LED as a heartbeat instead -- much more useful
51 for debugging -- based on the version for PReP by Cort */
52 /* acts like an actual heart beat -- ie thump-thump-pause... */
53 if (mach_heartbeat) {
54 static unsigned cnt = 0, period = 0, dist = 0;
55
56 if (cnt == 0 || cnt == dist)
57 mach_heartbeat( 1 );
58 else if (cnt == 7 || cnt == dist+7)
59 mach_heartbeat( 0 );
60
61 if (++cnt > period) {
62 cnt = 0;
63 /* The hyperbolic function below modifies the heartbeat period
64 * length in dependency of the current (5min) load. It goes
65 * through the points f(0)=126, f(1)=86, f(5)=51,
66 * f(inf)->30. */
67 period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30;
68 dist = period / 4;
69 }
70 }
71#endif /* CONFIG_HEARTBEAT */
72 return IRQ_HANDLED;
73}
74
75#ifdef CONFIG_M68KCLASSIC
76#if !IS_BUILTIN(CONFIG_RTC_DRV_GENERIC)
77void read_persistent_clock64(struct timespec64 *ts)
78{
79 struct rtc_time time;
80
81 ts->tv_sec = 0;
82 ts->tv_nsec = 0;
83
84 if (!mach_hwclk)
85 return;
86
87 mach_hwclk(0, &time);
88
89 ts->tv_sec = mktime64(time.tm_year + 1900, time.tm_mon + 1, time.tm_mday,
90 time.tm_hour, time.tm_min, time.tm_sec);
91}
92#endif
93
94#if IS_ENABLED(CONFIG_RTC_DRV_GENERIC)
95static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm)
96{
97 mach_hwclk(0, tm);
98 return 0;
99}
100
101static int rtc_generic_set_time(struct device *dev, struct rtc_time *tm)
102{
103 if (mach_hwclk(1, tm) < 0)
104 return -EOPNOTSUPP;
105 return 0;
106}
107
108static int rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
109{
110 struct rtc_pll_info pll;
111 struct rtc_pll_info __user *argp = (void __user *)arg;
112
113 switch (cmd) {
114 case RTC_PLL_GET:
115 if (!mach_get_rtc_pll || mach_get_rtc_pll(&pll))
116 return -EINVAL;
117 return copy_to_user(argp, &pll, sizeof pll) ? -EFAULT : 0;
118
119 case RTC_PLL_SET:
120 if (!mach_set_rtc_pll)
121 return -EINVAL;
122 if (!capable(CAP_SYS_TIME))
123 return -EACCES;
124 if (copy_from_user(&pll, argp, sizeof(pll)))
125 return -EFAULT;
126 return mach_set_rtc_pll(&pll);
127 }
128
129 return -ENOIOCTLCMD;
130}
131
132static const struct rtc_class_ops generic_rtc_ops = {
133 .ioctl = rtc_ioctl,
134 .read_time = rtc_generic_get_time,
135 .set_time = rtc_generic_set_time,
136};
137
138static int __init rtc_init(void)
139{
140 struct platform_device *pdev;
141
142 if (!mach_hwclk)
143 return -ENODEV;
144
145 pdev = platform_device_register_data(NULL, "rtc-generic", -1,
146 &generic_rtc_ops,
147 sizeof(generic_rtc_ops));
148 return PTR_ERR_OR_ZERO(pdev);
149}
150
151module_init(rtc_init);
152#endif /* CONFIG_RTC_DRV_GENERIC */
153#endif /* CONFIG M68KCLASSIC */
154
155void __init time_init(void)
156{
157 mach_sched_init(timer_interrupt);
158}
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/module.h>
15#include <linux/sched.h>
16#include <linux/kernel.h>
17#include <linux/param.h>
18#include <linux/string.h>
19#include <linux/mm.h>
20#include <linux/rtc.h>
21#include <linux/platform_device.h>
22
23#include <asm/machdep.h>
24#include <asm/io.h>
25#include <asm/irq_regs.h>
26
27#include <linux/time.h>
28#include <linux/timex.h>
29#include <linux/profile.h>
30
31/*
32 * timer_interrupt() needs to keep up the real-time clock,
33 * as well as call the "xtime_update()" routine every clocktick
34 */
35static irqreturn_t timer_interrupt(int irq, void *dummy)
36{
37 xtime_update(1);
38 update_process_times(user_mode(get_irq_regs()));
39 profile_tick(CPU_PROFILING);
40
41#ifdef CONFIG_HEARTBEAT
42 /* use power LED as a heartbeat instead -- much more useful
43 for debugging -- based on the version for PReP by Cort */
44 /* acts like an actual heart beat -- ie thump-thump-pause... */
45 if (mach_heartbeat) {
46 static unsigned cnt = 0, period = 0, dist = 0;
47
48 if (cnt == 0 || cnt == dist)
49 mach_heartbeat( 1 );
50 else if (cnt == 7 || cnt == dist+7)
51 mach_heartbeat( 0 );
52
53 if (++cnt > period) {
54 cnt = 0;
55 /* The hyperbolic function below modifies the heartbeat period
56 * length in dependency of the current (5min) load. It goes
57 * through the points f(0)=126, f(1)=86, f(5)=51,
58 * f(inf)->30. */
59 period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30;
60 dist = period / 4;
61 }
62 }
63#endif /* CONFIG_HEARTBEAT */
64 return IRQ_HANDLED;
65}
66
67void read_persistent_clock(struct timespec *ts)
68{
69 struct rtc_time time;
70 ts->tv_sec = 0;
71 ts->tv_nsec = 0;
72
73 if (mach_hwclk) {
74 mach_hwclk(0, &time);
75
76 if ((time.tm_year += 1900) < 1970)
77 time.tm_year += 100;
78 ts->tv_sec = mktime(time.tm_year, time.tm_mon, time.tm_mday,
79 time.tm_hour, time.tm_min, time.tm_sec);
80 }
81}
82
83void __init time_init(void)
84{
85 mach_sched_init(timer_interrupt);
86}
87
88#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
89
90u32 arch_gettimeoffset(void)
91{
92 return mach_gettimeoffset() * 1000;
93}
94
95static int __init rtc_init(void)
96{
97 struct platform_device *pdev;
98
99 if (!mach_hwclk)
100 return -ENODEV;
101
102 pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0);
103 if (IS_ERR(pdev))
104 return PTR_ERR(pdev);
105
106 return 0;
107}
108
109module_init(rtc_init);
110
111#endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */