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/*
* Copyright (c) 2020, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#ifndef _LINUX_TEGRA_GTE_ENGINE_H
#define _LINUX_TEGRA_GTE_ENGINE_H
#include <linux/device.h>
struct tegra_gte_ev_desc {
int id;
int gid;
u32 ev_bit;
u32 slice;
};
/* GTE hardware timestamping event details */
struct tegra_gte_ev_detail {
u64 ts_raw; /* raw counter value */
u64 ts_ns; /* counter value converted into nano seconds */
int dir; /* direction of the event */
};
#ifdef CONFIG_TEGRA_HTS_GTE
/*
* GTE event registration function
*
* Parameters:
*
* Input:
* @np: device node of the interested GTE device
* @ev_id: event id
*
* Returns:
* Returns ERR_PTR in case of failure or valid
* struct tegra_gte_ev_desc for success.
*
* Note: API is not stable and subject to change.
*/
struct tegra_gte_ev_desc *tegra_gte_register_event(struct device_node *np,
u32 ev_id);
/*
* GTE event un-registration function
*
* Parameters:
*
* Input:
* @desc: This parameter should be the same as returned from register
*
* Returns:
* Returns 0 for success and any other value for the failure
*
* Note: API is not stable and subject to change.
*/
int tegra_gte_unregister_event(struct tegra_gte_ev_desc *desc);
/*
* GTE event retrieval function
*
* Parameters:
*
* Input:
* @desc: This parameter should be the same as returned from register
*
* Output:
* @hts: hts event details
*
* Returns:
* Returns 0 for success and any other value for the failure
*
* Note: API is not stable and subject to change.
*/
int tegra_gte_retrieve_event(const struct tegra_gte_ev_desc *desc,
struct tegra_gte_ev_detail *hts);
#else /* ! CONFIG_TEGRA_HTS_GTE */
static inline struct tegra_gte_ev_desc *tegra_gte_register_event(
struct device_node *np, u32 ev_id)
{
return ERR_PTR(-ENOSYS);
}
static inline int tegra_gte_unregister_event(struct tegra_gte_ev_desc *desc)
{
return -ENOSYS;
}
static inline int tegra_gte_retrieve_event(const struct tegra_gte_ev_desc *desc,
struct tegra_gte_ev_detail *hts)
{
return -ENOSYS;
}
#endif /* ! CONFIG_TEGRA_HTS_GTE */
#endif
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