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m_I|+ /* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright (c) 2020 Pengutronix, Marc Kleine-Budde
* Copyright (c) 2021 Vincent Mailhol
*/
#ifndef _CAN_BITTIMING_H
#define _CAN_BITTIMING_H
#include
#include
#define CAN_SYNC_SEG 1
#define CAN_BITRATE_UNSET 0
#define CAN_BITRATE_UNKNOWN (-1U)
#define CAN_CTRLMODE_TDC_MASK \
(CAN_CTRLMODE_TDC_AUTO | CAN_CTRLMODE_TDC_MANUAL)
/*
* struct can_tdc - CAN FD Transmission Delay Compensation parameters
*
* At high bit rates, the propagation delay from the TX pin to the RX
* pin of the transceiver causes measurement errors: the sample point
* on the RX pin might occur on the previous bit.
*
* To solve this issue, ISO 11898-1 introduces in section 11.3.3
* "Transmitter delay compensation" a SSP (Secondary Sample Point)
* equal to the distance from the start of the bit time on the TX pin
* to the actual measurement on the RX pin.
*
* This structure contains the parameters to calculate that SSP.
*
* -+----------- one bit ----------+-- TX pin
* |<--- Sample Point --->|
*
* --+----------- one bit ----------+-- RX pin
* |<-------- TDCV -------->|
* |<------- TDCO ------->|
* |<----------- Secondary Sample Point ---------->|
*
* To increase precision, contrary to the other bittiming parameters
* which are measured in time quanta, the TDC parameters are measured
* in clock periods (also referred as "minimum time quantum" in ISO
* 11898-1).
*
* @tdcv: Transmitter Delay Compensation Value. The time needed for
* the signal to propagate, i.e. the distance, in clock periods,
* from the start of the bit on the TX pin to when it is received
* on the RX pin. @tdcv depends on the controller modes:
*
* CAN_CTRLMODE_TDC_AUTO is set: The transceiver dynamically
* measures @tdcv for each transmitted CAN FD frame and the
* value provided here should be ignored.
*
* CAN_CTRLMODE_TDC_MANUAL is set: use the fixed provided @tdcv
* value.
*
* N.B. CAN_CTRLMODE_TDC_AUTO and CAN_CTRLMODE_TDC_MANUAL are
* mutually exclusive. Only one can be set at a time. If both
* CAN_TDC_CTRLMODE_AUTO and CAN_TDC_CTRLMODE_MANUAL are unset,
* TDC is disabled and all the values of this structure should be
* ignored.
*
* @tdco: Transmitter Delay Compensa