1 // SPDX-License-Identifier: GPL-2.0-only 1 // SPDX-License-Identifier: GPL-2.0-only
2 /* 2 /*
3 * linux/arch/arm/kernel/time.c !! 3 * linux/arch/m68k/kernel/time.c
4 * 4 *
5 * Copyright (C) 1991, 1992, 1995 Linus Torv 5 * Copyright (C) 1991, 1992, 1995 Linus Torvalds
6 * Modifications for ARM (C) 1994-2001 Russel <<
7 * 6 *
8 * This file contains the ARM-specific time h !! 7 * This file contains the m68k-specific time handling details.
9 * reading the RTC at bootup, etc... !! 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
10 */ 12 */
11 #include <linux/clockchips.h> !! 13
12 #include <linux/clocksource.h> <<
13 #include <linux/errno.h> 14 #include <linux/errno.h>
14 #include <linux/export.h> 15 #include <linux/export.h>
15 #include <linux/init.h> !! 16 #include <linux/module.h>
16 #include <linux/interrupt.h> <<
17 #include <linux/irq.h> <<
18 #include <linux/kernel.h> <<
19 #include <linux/of_clk.h> <<
20 #include <linux/profile.h> <<
21 #include <linux/sched.h> 17 #include <linux/sched.h>
22 #include <linux/sched_clock.h> !! 18 #include <linux/sched/loadavg.h>
23 #include <linux/smp.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
24 #include <linux/time.h> 30 #include <linux/time.h>
25 #include <linux/timex.h> 31 #include <linux/timex.h>
26 #include <linux/timer.h> !! 32 #include <linux/profile.h>
27 33
28 #include <asm/mach/arch.h> <<
29 #include <asm/mach/time.h> <<
30 #include <asm/stacktrace.h> <<
31 #include <asm/thread_info.h> <<
32 34
33 #if defined(CONFIG_RTC_DRV_CMOS) || defined(CO !! 35 unsigned long (*mach_random_get_entropy)(void);
34 defined(CONFIG_NVRAM) || defined(CONFIG_NV !! 36 EXPORT_SYMBOL_GPL(mach_random_get_entropy);
35 /* this needs a better home */ <<
36 DEFINE_SPINLOCK(rtc_lock); <<
37 EXPORT_SYMBOL(rtc_lock); <<
38 #endif /* pc-style 'CMOS' RTC support */ <<
39 37
40 /* change this if you have some constant time !! 38 #ifdef CONFIG_HEARTBEAT
41 #define USECS_PER_JIFFY (1000000/HZ) !! 39 void 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 */
42 64
43 #ifdef CONFIG_SMP !! 65 #ifdef CONFIG_M68KCLASSIC
44 unsigned long profile_pc(struct pt_regs *regs) !! 66 /* machine dependent timer functions */
>> 67 int (*mach_hwclk) (int, struct rtc_time*);
>> 68 EXPORT_SYMBOL(mach_hwclk);
>> 69
>> 70 int (*mach_get_rtc_pll)(struct rtc_pll_info *);
>> 71 int (*mach_set_rtc_pll)(struct rtc_pll_info *);
>> 72 EXPORT_SYMBOL(mach_get_rtc_pll);
>> 73 EXPORT_SYMBOL(mach_set_rtc_pll);
>> 74
>> 75 #if !IS_BUILTIN(CONFIG_RTC_DRV_GENERIC)
>> 76 void read_persistent_clock64(struct timespec64 *ts)
45 { 77 {
46 struct stackframe frame; !! 78 struct rtc_time time;
>> 79
>> 80 ts->tv_sec = 0;
>> 81 ts->tv_nsec = 0;
47 82
48 if (!in_lock_functions(regs->ARM_pc)) !! 83 if (!mach_hwclk)
49 return regs->ARM_pc; !! 84 return;
50 85
51 arm_get_current_stackframe(regs, &fram !! 86 mach_hwclk(0, &time);
52 do { <<
53 int ret = unwind_frame(&frame) <<
54 if (ret < 0) <<
55 return 0; <<
56 } while (in_lock_functions(frame.pc)); <<
57 87
58 return frame.pc; !! 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);
59 } 90 }
60 EXPORT_SYMBOL(profile_pc); <<
61 #endif 91 #endif
62 92
63 static void dummy_clock_access(struct timespec !! 93 #if IS_ENABLED(CONFIG_RTC_DRV_GENERIC)
>> 94 static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm)
64 { 95 {
65 ts->tv_sec = 0; !! 96 mach_hwclk(0, tm);
66 ts->tv_nsec = 0; !! 97 return 0;
67 } 98 }
68 99
69 static clock_access_fn __read_persistent_clock !! 100 static int rtc_generic_set_time(struct device *dev, struct rtc_time *tm)
70 <<
71 void read_persistent_clock64(struct timespec64 <<
72 { 101 {
73 __read_persistent_clock(ts); !! 102 if (mach_hwclk(1, tm) < 0)
>> 103 return -EOPNOTSUPP;
>> 104 return 0;
74 } 105 }
75 106
76 int __init register_persistent_clock(clock_acc !! 107 static int rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
77 { 108 {
78 /* Only allow the clockaccess function !! 109 struct rtc_pll_info pll;
79 if (__read_persistent_clock == dummy_c !! 110 struct rtc_pll_info __user *argp = (void __user *)arg;
80 if (read_persistent) !! 111
81 __read_persistent_cloc !! 112 switch (cmd) {
82 return 0; !! 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);
83 } 126 }
84 127
85 return -EINVAL; !! 128 return -ENOIOCTLCMD;
>> 129 }
>> 130
>> 131 static 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
>> 137 static 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);
86 } 148 }
87 149
>> 150 module_init(rtc_init);
>> 151 #endif /* CONFIG_RTC_DRV_GENERIC */
>> 152 #endif /* CONFIG M68KCLASSIC */
>> 153
88 void __init time_init(void) 154 void __init time_init(void)
89 { 155 {
90 if (machine_desc->init_time) { !! 156 mach_sched_init();
91 machine_desc->init_time(); <<
92 } else { <<
93 #ifdef CONFIG_COMMON_CLK <<
94 of_clk_init(NULL); <<
95 #endif <<
96 timer_probe(); <<
97 tick_setup_hrtimer_broadcast() <<
98 } <<
99 } 157 }
100 158
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