1 // SPDX-License-Identifier: GPL-2.0-or-later !! 1 // SPDX-License-Identifier: GPL-2.0-only
2 /* 2 /*
3 * Copyright 2001 MontaVista Software Inc. !! 3 * linux/arch/m68k/kernel/time.c
4 * Author: Jun Sun, jsun@mvista.com or jsun@ju <<
5 * Copyright (c) 2003, 2004 Maciej W. Rozycki <<
6 * 4 *
7 * Common time service routines for MIPS machi !! 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
8 */ 12 */
9 #include <linux/bug.h> !! 13
10 #include <linux/clockchips.h> !! 14 #include <linux/errno.h>
11 #include <linux/types.h> !! 15 #include <linux/export.h>
12 #include <linux/kernel.h> !! 16 #include <linux/module.h>
13 #include <linux/init.h> <<
14 #include <linux/sched.h> 17 #include <linux/sched.h>
>> 18 #include <linux/sched/loadavg.h>
>> 19 #include <linux/kernel.h>
15 #include <linux/param.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
16 #include <linux/time.h> 30 #include <linux/time.h>
17 #include <linux/timex.h> 31 #include <linux/timex.h>
18 #include <linux/smp.h> !! 32 #include <linux/profile.h>
19 #include <linux/spinlock.h> <<
20 #include <linux/export.h> <<
21 #include <linux/cpufreq.h> <<
22 #include <linux/delay.h> <<
23 33
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 <<
31 static DEFINE_PER_CPU(unsigned long, pcp_lpj_r <<
32 static DEFINE_PER_CPU(unsigned long, pcp_lpj_r <<
33 static unsigned long glb_lpj_ref; <<
34 static unsigned long glb_lpj_ref_freq; <<
35 <<
36 static int cpufreq_callback(struct notifier_bl <<
37 unsigned long val, <<
38 { <<
39 struct cpufreq_freqs *freq = data; <<
40 struct cpumask *cpus = freq->policy->c <<
41 unsigned long lpj; <<
42 int cpu; <<
43 <<
44 /* <<
45 * Skip lpj numbers adjustment if the <<
46 * the loops delay. (Is this possible? <<
47 */ <<
48 if (freq->flags & CPUFREQ_CONST_LOOPS) <<
49 return NOTIFY_OK; <<
50 <<
51 /* Save the initial values of the lpje <<
52 if (!glb_lpj_ref) { <<
53 glb_lpj_ref = boot_cpu_data.ud <<
54 glb_lpj_ref_freq = freq->old; <<
55 <<
56 for_each_online_cpu(cpu) { <<
57 per_cpu(pcp_lpj_ref, c <<
58 cpu_data[cpu]. <<
59 per_cpu(pcp_lpj_ref_fr <<
60 } <<
61 } <<
62 34
63 /* !! 35 unsigned long (*mach_random_get_entropy)(void);
64 * Adjust global lpj variable and per- !! 36 EXPORT_SYMBOL_GPL(mach_random_get_entropy);
65 * accordance with the new CPU frequen <<
66 */ <<
67 if ((val == CPUFREQ_PRECHANGE && freq <<
68 (val == CPUFREQ_POSTCHANGE && freq <<
69 loops_per_jiffy = cpufreq_scal <<
70 <<
71 <<
72 <<
73 for_each_cpu(cpu, cpus) { <<
74 lpj = cpufreq_scale(pe <<
75 pe <<
76 fr <<
77 cpu_data[cpu].udelay_v <<
78 } <<
79 } <<
80 37
81 return NOTIFY_OK; !! 38 #ifdef CONFIG_HEARTBEAT
>> 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 }
82 } 62 }
>> 63 #endif /* CONFIG_HEARTBEAT */
83 64
84 static struct notifier_block cpufreq_notifier !! 65 #ifdef CONFIG_M68KCLASSIC
85 .notifier_call = cpufreq_callback, !! 66 /* machine dependent timer functions */
86 }; !! 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);
87 74
88 static int __init register_cpufreq_notifier(vo !! 75 #if !IS_BUILTIN(CONFIG_RTC_DRV_GENERIC)
>> 76 void read_persistent_clock64(struct timespec64 *ts)
89 { 77 {
90 return cpufreq_register_notifier(&cpuf !! 78 struct rtc_time time;
91 CPUFR <<
92 } <<
93 core_initcall(register_cpufreq_notifier); <<
94 79
95 #endif /* CONFIG_CPU_FREQ */ !! 80 ts->tv_sec = 0;
>> 81 ts->tv_nsec = 0;
96 82
97 /* !! 83 if (!mach_hwclk)
98 * forward reference !! 84 return;
99 */ <<
100 DEFINE_SPINLOCK(rtc_lock); <<
101 EXPORT_SYMBOL(rtc_lock); <<
102 85
103 static int null_perf_irq(void) !! 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)
>> 94 static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm)
104 { 95 {
>> 96 mach_hwclk(0, tm);
105 return 0; 97 return 0;
106 } 98 }
107 99
108 int (*perf_irq)(void) = null_perf_irq; !! 100 static 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 }
109 106
110 EXPORT_SYMBOL(perf_irq); !! 107 static 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;
111 111
112 /* !! 112 switch (cmd) {
113 * time_init() - it does the following things. !! 113 case RTC_PLL_GET:
114 * !! 114 if (!mach_get_rtc_pll || mach_get_rtc_pll(&pll))
115 * 1) plat_time_init() - !! 115 return -EINVAL;
116 * a) (optional) set up RTC routines, !! 116 return copy_to_user(argp, &pll, sizeof pll) ? -EFAULT : 0;
117 * b) (optional) calibrate and set the mi !! 117
118 * (only needed if you intended to us !! 118 case RTC_PLL_SET:
119 * source) !! 119 if (!mach_set_rtc_pll)
120 * 2) calculate a couple of cached variables f !! 120 return -EINVAL;
121 */ !! 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 }
122 127
123 unsigned int mips_hpt_frequency; !! 128 return -ENOIOCTLCMD;
124 EXPORT_SYMBOL_GPL(mips_hpt_frequency); !! 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 };
125 136
126 static __init int cpu_has_mfc0_count_bug(void) !! 137 static int __init rtc_init(void)
127 { 138 {
128 switch (current_cpu_type()) { !! 139 struct platform_device *pdev;
129 case CPU_R4000PC: <<
130 case CPU_R4000SC: <<
131 case CPU_R4000MC: <<
132 /* <<
133 * V3.0 is documented as suffe <<
134 * Afaik this is the last vers <<
135 * were marketed as R4400. <<
136 */ <<
137 return 1; <<
138 <<
139 case CPU_R4400PC: <<
140 case CPU_R4400SC: <<
141 case CPU_R4400MC: <<
142 /* <<
143 * The published errata for th <<
144 * has the mfc0 from count bug <<
145 * produced. <<
146 */ <<
147 return 1; <<
148 } <<
149 140
150 return 0; !! 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);
151 } 148 }
152 149
>> 150 module_init(rtc_init);
>> 151 #endif /* CONFIG_RTC_DRV_GENERIC */
>> 152 #endif /* CONFIG M68KCLASSIC */
>> 153
153 void __init time_init(void) 154 void __init time_init(void)
154 { 155 {
155 plat_time_init(); !! 156 mach_sched_init();
156 <<
157 /* <<
158 * The use of the R4k timer as a clock <<
159 * if reading the Count register might <<
160 * interrupt, then we don't use the ti <<
161 * We may still use the timer as a clo <<
162 * timer interrupt isn't reliable; the <<
163 * matter then, because we don't use t <<
164 */ <<
165 if (mips_clockevent_init() != 0 || !cp <<
166 init_mips_clocksource(); <<
167 } 157 }
168 158
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