mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
3431ca4837
Currently, the meaning of the value returned by RTC_VL_READ is undocumented and left to the driver implementation. In order to get more meaningful values, define a set of values to use as to make clear to userspace what is the status of the various voltages feeding the RTC. Link: https://lore.kernel.org/r/20191214220259.621996-2-alexandre.belloni@bootlin.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
114 lines
4.2 KiB
C
114 lines
4.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
|
|
/*
|
|
* Generic RTC interface.
|
|
* This version contains the part of the user interface to the Real Time Clock
|
|
* service. It is used with both the legacy mc146818 and also EFI
|
|
* Struct rtc_time and first 12 ioctl by Paul Gortmaker, 1996 - separated out
|
|
* from <linux/mc146818rtc.h> to this file for 2.4 kernels.
|
|
*
|
|
* Copyright (C) 1999 Hewlett-Packard Co.
|
|
* Copyright (C) 1999 Stephane Eranian <eranian@hpl.hp.com>
|
|
*/
|
|
#ifndef _UAPI_LINUX_RTC_H_
|
|
#define _UAPI_LINUX_RTC_H_
|
|
|
|
/*
|
|
* The struct used to pass data via the following ioctl. Similar to the
|
|
* struct tm in <time.h>, but it needs to be here so that the kernel
|
|
* source is self contained, allowing cross-compiles, etc. etc.
|
|
*/
|
|
|
|
struct rtc_time {
|
|
int tm_sec;
|
|
int tm_min;
|
|
int tm_hour;
|
|
int tm_mday;
|
|
int tm_mon;
|
|
int tm_year;
|
|
int tm_wday;
|
|
int tm_yday;
|
|
int tm_isdst;
|
|
};
|
|
|
|
/*
|
|
* This data structure is inspired by the EFI (v0.92) wakeup
|
|
* alarm API.
|
|
*/
|
|
struct rtc_wkalrm {
|
|
unsigned char enabled; /* 0 = alarm disabled, 1 = alarm enabled */
|
|
unsigned char pending; /* 0 = alarm not pending, 1 = alarm pending */
|
|
struct rtc_time time; /* time the alarm is set to */
|
|
};
|
|
|
|
/*
|
|
* Data structure to control PLL correction some better RTC feature
|
|
* pll_value is used to get or set current value of correction,
|
|
* the rest of the struct is used to query HW capabilities.
|
|
* This is modeled after the RTC used in Q40/Q60 computers but
|
|
* should be sufficiently flexible for other devices
|
|
*
|
|
* +ve pll_value means clock will run faster by
|
|
* pll_value*pll_posmult/pll_clock
|
|
* -ve pll_value means clock will run slower by
|
|
* pll_value*pll_negmult/pll_clock
|
|
*/
|
|
|
|
struct rtc_pll_info {
|
|
int pll_ctrl; /* placeholder for fancier control */
|
|
int pll_value; /* get/set correction value */
|
|
int pll_max; /* max +ve (faster) adjustment value */
|
|
int pll_min; /* max -ve (slower) adjustment value */
|
|
int pll_posmult; /* factor for +ve correction */
|
|
int pll_negmult; /* factor for -ve correction */
|
|
long pll_clock; /* base PLL frequency */
|
|
};
|
|
|
|
/*
|
|
* ioctl calls that are permitted to the /dev/rtc interface, if
|
|
* any of the RTC drivers are enabled.
|
|
*/
|
|
|
|
#define RTC_AIE_ON _IO('p', 0x01) /* Alarm int. enable on */
|
|
#define RTC_AIE_OFF _IO('p', 0x02) /* ... off */
|
|
#define RTC_UIE_ON _IO('p', 0x03) /* Update int. enable on */
|
|
#define RTC_UIE_OFF _IO('p', 0x04) /* ... off */
|
|
#define RTC_PIE_ON _IO('p', 0x05) /* Periodic int. enable on */
|
|
#define RTC_PIE_OFF _IO('p', 0x06) /* ... off */
|
|
#define RTC_WIE_ON _IO('p', 0x0f) /* Watchdog int. enable on */
|
|
#define RTC_WIE_OFF _IO('p', 0x10) /* ... off */
|
|
|
|
#define RTC_ALM_SET _IOW('p', 0x07, struct rtc_time) /* Set alarm time */
|
|
#define RTC_ALM_READ _IOR('p', 0x08, struct rtc_time) /* Read alarm time */
|
|
#define RTC_RD_TIME _IOR('p', 0x09, struct rtc_time) /* Read RTC time */
|
|
#define RTC_SET_TIME _IOW('p', 0x0a, struct rtc_time) /* Set RTC time */
|
|
#define RTC_IRQP_READ _IOR('p', 0x0b, unsigned long) /* Read IRQ rate */
|
|
#define RTC_IRQP_SET _IOW('p', 0x0c, unsigned long) /* Set IRQ rate */
|
|
#define RTC_EPOCH_READ _IOR('p', 0x0d, unsigned long) /* Read epoch */
|
|
#define RTC_EPOCH_SET _IOW('p', 0x0e, unsigned long) /* Set epoch */
|
|
|
|
#define RTC_WKALM_SET _IOW('p', 0x0f, struct rtc_wkalrm)/* Set wakeup alarm*/
|
|
#define RTC_WKALM_RD _IOR('p', 0x10, struct rtc_wkalrm)/* Get wakeup alarm*/
|
|
|
|
#define RTC_PLL_GET _IOR('p', 0x11, struct rtc_pll_info) /* Get PLL correction */
|
|
#define RTC_PLL_SET _IOW('p', 0x12, struct rtc_pll_info) /* Set PLL correction */
|
|
|
|
#define RTC_VL_DATA_INVALID BIT(0) /* Voltage too low, RTC data is invalid */
|
|
#define RTC_VL_BACKUP_LOW BIT(1) /* Backup voltage is low */
|
|
#define RTC_VL_BACKUP_EMPTY BIT(2) /* Backup empty or not present */
|
|
#define RTC_VL_ACCURACY_LOW BIT(3) /* Voltage is low, RTC accuracy is reduced */
|
|
|
|
#define RTC_VL_READ _IOR('p', 0x13, unsigned int) /* Voltage low detection */
|
|
#define RTC_VL_CLR _IO('p', 0x14) /* Clear voltage low information */
|
|
|
|
/* interrupt flags */
|
|
#define RTC_IRQF 0x80 /* Any of the following is active */
|
|
#define RTC_PF 0x40 /* Periodic interrupt */
|
|
#define RTC_AF 0x20 /* Alarm interrupt */
|
|
#define RTC_UF 0x10 /* Update interrupt for 1Hz RTC */
|
|
|
|
|
|
#define RTC_MAX_FREQ 8192
|
|
|
|
|
|
#endif /* _UAPI_LINUX_RTC_H_ */
|