1 // SPDX-License-Identifier: GPL-2.0-only 1 // SPDX-License-Identifier: GPL-2.0-only
2 /* 2 /*
3 * Copyright (C) 2012 Regents of the Universit !! 3 * linux/arch/m68k/kernel/time.c
4 * Copyright (C) 2017 SiFive !! 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
5 */ 12 */
6 13
7 #include <linux/acpi.h> !! 14 #include <linux/errno.h>
8 #include <linux/of_clk.h> !! 15 #include <linux/export.h>
9 #include <linux/clockchips.h> !! 16 #include <linux/module.h>
10 #include <linux/clocksource.h> !! 17 #include <linux/sched.h>
11 #include <linux/delay.h> !! 18 #include <linux/sched/loadavg.h>
12 #include <asm/sbi.h> !! 19 #include <linux/kernel.h>
13 #include <asm/processor.h> !! 20 #include <linux/param.h>
14 #include <asm/timex.h> !! 21 #include <linux/string.h>
15 #include <asm/paravirt.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>
16 33
17 unsigned long riscv_timebase __ro_after_init; <<
18 EXPORT_SYMBOL_GPL(riscv_timebase); <<
19 34
20 void __init time_init(void) !! 35 unsigned long (*mach_random_get_entropy)(void);
>> 36 EXPORT_SYMBOL_GPL(mach_random_get_entropy);
>> 37
>> 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 }
>> 62 }
>> 63 #endif /* CONFIG_HEARTBEAT */
>> 64
>> 65 #ifdef CONFIG_M68KCLASSIC
>> 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)
21 { 77 {
22 struct device_node *cpu; !! 78 struct rtc_time time;
23 struct acpi_table_rhct *rhct; <<
24 acpi_status status; <<
25 u32 prop; <<
26 <<
27 if (acpi_disabled) { <<
28 cpu = of_find_node_by_path("/c <<
29 if (!cpu || of_property_read_u <<
30 panic("RISC-V system w <<
31 <<
32 of_node_put(cpu); <<
33 riscv_timebase = prop; <<
34 of_clk_init(NULL); <<
35 } else { <<
36 status = acpi_get_table(ACPI_S <<
37 if (ACPI_FAILURE(status)) <<
38 panic("RISC-V ACPI sys <<
39 79
40 riscv_timebase = rhct->time_ba !! 80 ts->tv_sec = 0;
41 acpi_put_table((struct acpi_ta !! 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)
>> 94 static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm)
>> 95 {
>> 96 mach_hwclk(0, tm);
>> 97 return 0;
>> 98 }
>> 99
>> 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 }
>> 106
>> 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
>> 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);
42 } 126 }
43 127
44 lpj_fine = riscv_timebase / HZ; !! 128 return -ENOIOCTLCMD;
>> 129 }
45 130
46 timer_probe(); !! 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 };
47 136
48 tick_setup_hrtimer_broadcast(); !! 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);
>> 148 }
>> 149
>> 150 module_init(rtc_init);
>> 151 #endif /* CONFIG_RTC_DRV_GENERIC */
>> 152 #endif /* CONFIG M68KCLASSIC */
49 153
50 pv_time_init(); !! 154 void __init time_init(void)
>> 155 {
>> 156 mach_sched_init();
51 } 157 }
52 158
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