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/* SPDX-License-Identifier: ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) */
/*
* Copyright (C) 2022-2024 OpenSynergy GmbH
* Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
*/
#ifndef _LINUX_VIRTIO_RTC_H
#define _LINUX_VIRTIO_RTC_H
#include <linux/types.h>
/* alarm feature */
#define VIRTIO_RTC_F_ALARM 0
/* read request message types */
#define VIRTIO_RTC_REQ_READ 0x0001
#define VIRTIO_RTC_REQ_READ_CROSS 0x0002
/* control request message types */
#define VIRTIO_RTC_REQ_CFG 0x1000
#define VIRTIO_RTC_REQ_CLOCK_CAP 0x1001
#define VIRTIO_RTC_REQ_CROSS_CAP 0x1002
#define VIRTIO_RTC_REQ_READ_ALARM 0x1003
#define VIRTIO_RTC_REQ_SET_ALARM 0x1004
#define VIRTIO_RTC_REQ_SET_ALARM_ENABLED 0x1005
/* alarmq message types */
#define VIRTIO_RTC_NOTIF_ALARM 0x2000
/* Message headers */
/** common request header */
struct virtio_rtc_req_head {
__le16 msg_type;
__u8 reserved[6];
};
/** common response header */
struct virtio_rtc_resp_head {
#define VIRTIO_RTC_S_OK 0
#define VIRTIO_RTC_S_EOPNOTSUPP 2
#define VIRTIO_RTC_S_ENODEV 3
#define VIRTIO_RTC_S_EINVAL 4
#define VIRTIO_RTC_S_EIO 5
__u8 status;
__u8 reserved[7];
};
/** common notification header */
struct virtio_rtc_notif_head {
__le16 msg_type;
__u8 reserved[6];
};
/* read requests */
/* VIRTIO_RTC_REQ_READ message */
struct virtio_rtc_req_read {
struct virtio_rtc_req_head head;
__le16 clock_id;
__u8 reserved[6];
};
struct virtio_rtc_resp_read {
struct virtio_rtc_resp_head head;
__le64 clock_reading;
};
/* VIRTIO_RTC_REQ_READ_CROSS message */
struct virtio_rtc_req_read_cross {
struct virtio_rtc_req_head head;
__le16 clock_id;
/* Arm Generic Timer Counter-timer Virtual Count Register (CNTVCT_EL0) */
#define VIRTIO_RTC_COUNTER_ARM_VCT 0
/* x86 Time-Stamp Counter */
#define VIRTIO_RTC_COUNTER_X86_TSC 1
/* Invalid */
#define VIRTIO_RTC_COUNTER_INVALID 0xFF
__u8 hw_counter;
__u8 reserved[5];
};
struct virtio_rtc_resp_read_cross {
struct virtio_rtc_resp_head head;
__le64 clock_reading;
__le64 counter_cycles;
};
/* control requests */
/* VIRTIO_RTC_REQ_CFG message */
struct virtio_rtc_req_cfg {
struct virtio_rtc_req_head head;
/* no request params */
};
struct virtio_rtc_resp_cfg {
struct virtio_rtc_resp_head head;
/** # of clocks -> clock ids < num_clocks are valid */
__le16 num_clocks;
__u8 reserved[6];
};
/* VIRTIO_RTC_REQ_CLOCK_CAP message */
struct virtio_rtc_req_clock_cap {
struct virtio_rtc_req_head head;
__le16 clock_id;
__u8 reserved[6];
};
struct virtio_rtc_resp_clock_cap {
struct virtio_rtc_resp_head head;
#define VIRTIO_RTC_CLOCK_UTC 0
#define VIRTIO_RTC_CLOCK_TAI 1
#define VIRTIO_RTC_CLOCK_MONOTONIC 2
#define VIRTIO_RTC_CLOCK_UTC_SMEARED 3
#define VIRTIO_RTC_CLOCK_UTC_MAYBE_SMEARED 4
__u8 type;
#define VIRTIO_RTC_SMEAR_UNSPECIFIED 0
#define VIRTIO_RTC_SMEAR_NOON_LINEAR 1
#define VIRTIO_RTC_SMEAR_UTC_SLS 2
__u8 leap_second_smearing;
#define VIRTIO_RTC_FLAG_ALARM_CAP (1 << 0)
__u8 flags;
__u8 reserved[5];
};
/* VIRTIO_RTC_REQ_CROSS_CAP message */
struct virtio_rtc_req_cross_cap {
struct virtio_rtc_req_head head;
__le16 clock_id;
__u8 hw_counter;
__u8 reserved[5];
};
struct virtio_rtc_resp_cross_cap {
struct virtio_rtc_resp_head head;
#define VIRTIO_RTC_FLAG_CROSS_CAP (1 << 0)
__u8 flags;
__u8 reserved[7];
};
/* VIRTIO_RTC_REQ_READ_ALARM message */
struct virtio_rtc_req_read_alarm {
struct virtio_rtc_req_head head;
__le16 clock_id;
__u8 reserved[6];
};
struct virtio_rtc_resp_read_alarm {
struct virtio_rtc_resp_head head;
__le64 alarm_time;
#define VIRTIO_RTC_FLAG_ALARM_ENABLED (1 << 0)
__u8 flags;
__u8 reserved[7];
};
/* VIRTIO_RTC_REQ_SET_ALARM message */
struct virtio_rtc_req_set_alarm {
struct virtio_rtc_req_head head;
__le64 alarm_time;
__le16 clock_id;
/* flag VIRTIO_RTC_FLAG_ALARM_ENABLED */
__u8 flags;
__u8 reserved[5];
};
struct virtio_rtc_resp_set_alarm {
struct virtio_rtc_resp_head head;
/* no response params */
};
/* VIRTIO_RTC_REQ_SET_ALARM_ENABLED message */
struct virtio_rtc_req_set_alarm_enabled {
struct virtio_rtc_req_head head;
__le16 clock_id;
/* flag VIRTIO_RTC_ALARM_ENABLED */
__u8 flags;
__u8 reserved[5];
};
struct virtio_rtc_resp_set_alarm_enabled {
struct virtio_rtc_resp_head head;
/* no response params */
};
/** Union of request types for requestq */
union virtio_rtc_req_requestq {
struct virtio_rtc_req_read read;
struct virtio_rtc_req_read_cross read_cross;
struct virtio_rtc_req_cfg cfg;
struct virtio_rtc_req_clock_cap clock_cap;
struct virtio_rtc_req_cross_cap cross_cap;
struct virtio_rtc_req_read_alarm read_alarm;
struct virtio_rtc_req_set_alarm set_alarm;
struct virtio_rtc_req_set_alarm_enabled set_alarm_enabled;
};
/** Union of response types for requestq */
union virtio_rtc_resp_requestq {
struct virtio_rtc_resp_read read;
struct virtio_rtc_resp_read_cross read_cross;
struct virtio_rtc_resp_cfg cfg;
struct virtio_rtc_resp_clock_cap clock_cap;
struct virtio_rtc_resp_cross_cap cross_cap;
struct virtio_rtc_resp_read_alarm read_alarm;
struct virtio_rtc_resp_set_alarm set_alarm;
struct virtio_rtc_resp_set_alarm_enabled set_alarm_enabled;
};
/* alarmq notifications */
/* VIRTIO_RTC_NOTIF_ALARM notification */
struct virtio_rtc_notif_alarm {
struct virtio_rtc_notif_head head;
__le16 clock_id;
__u8 reserved[6];
};
/** Union of notification types for alarmq */
union virtio_rtc_notif_alarmq {
struct virtio_rtc_notif_alarm alarm;
};
#endif /* _LINUX_VIRTIO_RTC_H */
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