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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2290aefa2e
Various CAN or CAN-FD IP may be able to run at a faster rate than what the transceiver the CAN node is connected to. This can lead to unexpected errors. However, CAN transceivers typically have fixed limitations and provide no means to discover these limitations at runtime. Therefore, add support for a can-transceiver node that can be reused by other CAN peripheral drivers to determine for both CAN and CAN-FD what the max bitrate that can be used. If the user tries to configure CAN to pass these maximum bitrates it will throw an error. Also add support for reading bitrate_max via the netlink interface. Reviewed-by: Suman Anna <s-anna@ti.com> Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com> [nsekhar@ti.com: fix build error with !CONFIG_OF] Signed-off-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Faiz Abbas <faiz_abbas@ti.com> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
145 lines
3.9 KiB
C
145 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* linux/can/netlink.h
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*
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* Definitions for the CAN netlink interface
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*
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* Copyright (c) 2009 Wolfgang Grandegger <wg@grandegger.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the version 2 of the GNU General Public License
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* as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _UAPI_CAN_NETLINK_H
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#define _UAPI_CAN_NETLINK_H
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#include <linux/types.h>
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/*
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* CAN bit-timing parameters
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*
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* For further information, please read chapter "8 BIT TIMING
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* REQUIREMENTS" of the "Bosch CAN Specification version 2.0"
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* at http://www.semiconductors.bosch.de/pdf/can2spec.pdf.
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*/
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struct can_bittiming {
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__u32 bitrate; /* Bit-rate in bits/second */
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__u32 sample_point; /* Sample point in one-tenth of a percent */
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__u32 tq; /* Time quanta (TQ) in nanoseconds */
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__u32 prop_seg; /* Propagation segment in TQs */
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__u32 phase_seg1; /* Phase buffer segment 1 in TQs */
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__u32 phase_seg2; /* Phase buffer segment 2 in TQs */
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__u32 sjw; /* Synchronisation jump width in TQs */
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__u32 brp; /* Bit-rate prescaler */
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};
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/*
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* CAN harware-dependent bit-timing constant
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*
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* Used for calculating and checking bit-timing parameters
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*/
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struct can_bittiming_const {
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char name[16]; /* Name of the CAN controller hardware */
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__u32 tseg1_min; /* Time segement 1 = prop_seg + phase_seg1 */
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__u32 tseg1_max;
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__u32 tseg2_min; /* Time segement 2 = phase_seg2 */
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__u32 tseg2_max;
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__u32 sjw_max; /* Synchronisation jump width */
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__u32 brp_min; /* Bit-rate prescaler */
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__u32 brp_max;
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__u32 brp_inc;
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};
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/*
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* CAN clock parameters
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*/
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struct can_clock {
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__u32 freq; /* CAN system clock frequency in Hz */
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};
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/*
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* CAN operational and error states
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*/
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enum can_state {
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CAN_STATE_ERROR_ACTIVE = 0, /* RX/TX error count < 96 */
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CAN_STATE_ERROR_WARNING, /* RX/TX error count < 128 */
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CAN_STATE_ERROR_PASSIVE, /* RX/TX error count < 256 */
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CAN_STATE_BUS_OFF, /* RX/TX error count >= 256 */
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CAN_STATE_STOPPED, /* Device is stopped */
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CAN_STATE_SLEEPING, /* Device is sleeping */
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CAN_STATE_MAX
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};
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/*
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* CAN bus error counters
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*/
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struct can_berr_counter {
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__u16 txerr;
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__u16 rxerr;
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};
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/*
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* CAN controller mode
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*/
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struct can_ctrlmode {
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__u32 mask;
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__u32 flags;
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};
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#define CAN_CTRLMODE_LOOPBACK 0x01 /* Loopback mode */
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#define CAN_CTRLMODE_LISTENONLY 0x02 /* Listen-only mode */
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#define CAN_CTRLMODE_3_SAMPLES 0x04 /* Triple sampling mode */
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#define CAN_CTRLMODE_ONE_SHOT 0x08 /* One-Shot mode */
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#define CAN_CTRLMODE_BERR_REPORTING 0x10 /* Bus-error reporting */
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#define CAN_CTRLMODE_FD 0x20 /* CAN FD mode */
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#define CAN_CTRLMODE_PRESUME_ACK 0x40 /* Ignore missing CAN ACKs */
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#define CAN_CTRLMODE_FD_NON_ISO 0x80 /* CAN FD in non-ISO mode */
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/*
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* CAN device statistics
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*/
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struct can_device_stats {
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__u32 bus_error; /* Bus errors */
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__u32 error_warning; /* Changes to error warning state */
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__u32 error_passive; /* Changes to error passive state */
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__u32 bus_off; /* Changes to bus off state */
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__u32 arbitration_lost; /* Arbitration lost errors */
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__u32 restarts; /* CAN controller re-starts */
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};
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/*
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* CAN netlink interface
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*/
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enum {
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IFLA_CAN_UNSPEC,
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IFLA_CAN_BITTIMING,
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IFLA_CAN_BITTIMING_CONST,
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IFLA_CAN_CLOCK,
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IFLA_CAN_STATE,
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IFLA_CAN_CTRLMODE,
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IFLA_CAN_RESTART_MS,
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IFLA_CAN_RESTART,
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IFLA_CAN_BERR_COUNTER,
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IFLA_CAN_DATA_BITTIMING,
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IFLA_CAN_DATA_BITTIMING_CONST,
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IFLA_CAN_TERMINATION,
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IFLA_CAN_TERMINATION_CONST,
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IFLA_CAN_BITRATE_CONST,
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IFLA_CAN_DATA_BITRATE_CONST,
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IFLA_CAN_BITRATE_MAX,
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__IFLA_CAN_MAX
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};
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#define IFLA_CAN_MAX (__IFLA_CAN_MAX - 1)
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/* u16 termination range: 1..65535 Ohms */
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#define CAN_TERMINATION_DISABLED 0
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#endif /* !_UAPI_CAN_NETLINK_H */
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