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f0d4ba9eff
The switch has the ability to take hardware generated time stamps per port for PTPv2 event messages in Rx and Tx direction. That is useful for achieving needed time synchronization precision for TSN devices/switches. So add support for it. There are two directions: * RX The switch has a single register per port to capture a timestamp. That mechanism is not used due to correlation problems. If the software processing is too slow and a PTPv2 event message is received before the previous one has been processed, false timestamps will be captured. Therefore, the switch can do "inline" timestamping which means it can insert the nanoseconds part of the timestamp directly into the PTPv2 event message. The reserved field (4 bytes) is leveraged for that. This might not be in accordance with (older) PTP standards, but is the only way to get reliable results. * TX In Tx direction there is no correlation problem, because the software and the driver has to ensure that only one event message is "on the fly". However, the switch provides also a mechanism to check whether a timestamp is lost. That can only happen when a timestamp is read and at this point another message is timestamped. So, that lost bit is checked just in case to indicate to the user that the driver or the software is somewhat buggy. Signed-off-by: Kamil Alkhouri <kamil.alkhouri@hs-offenburg.de> Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de> Acked-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
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/*
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* DSA driver for:
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* Hirschmann Hellcreek TSN switch.
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*
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* Copyright (C) 2019,2020 Hochschule Offenburg
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* Copyright (C) 2019,2020 Linutronix GmbH
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* Authors: Kurt Kanzenbach <kurt@linutronix.de>
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* Kamil Alkhouri <kamil.alkhouri@hs-offenburg.de>
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*/
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#ifndef _HELLCREEK_HWTSTAMP_H_
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#define _HELLCREEK_HWTSTAMP_H_
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#include <net/dsa.h>
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#include "hellcreek.h"
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/* Timestamp Register */
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#define PR_TS_RX_P1_STATUS_C (0x1d * 2)
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#define PR_TS_RX_P1_DATA_C (0x1e * 2)
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#define PR_TS_TX_P1_STATUS_C (0x1f * 2)
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#define PR_TS_TX_P1_DATA_C (0x20 * 2)
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#define PR_TS_RX_P2_STATUS_C (0x25 * 2)
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#define PR_TS_RX_P2_DATA_C (0x26 * 2)
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#define PR_TS_TX_P2_STATUS_C (0x27 * 2)
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#define PR_TS_TX_P2_DATA_C (0x28 * 2)
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#define PR_TS_STATUS_TS_AVAIL BIT(2)
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#define PR_TS_STATUS_TS_LOST BIT(3)
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#define SKB_PTP_TYPE(__skb) (*(unsigned int *)((__skb)->cb))
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/* TX_TSTAMP_TIMEOUT: This limits the time spent polling for a TX
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* timestamp. When working properly, hardware will produce a timestamp
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* within 1ms. Software may enounter delays, so the timeout is set
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* accordingly.
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*/
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#define TX_TSTAMP_TIMEOUT msecs_to_jiffies(40)
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int hellcreek_port_hwtstamp_set(struct dsa_switch *ds, int port,
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struct ifreq *ifr);
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int hellcreek_port_hwtstamp_get(struct dsa_switch *ds, int port,
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struct ifreq *ifr);
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bool hellcreek_port_rxtstamp(struct dsa_switch *ds, int port,
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struct sk_buff *clone, unsigned int type);
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bool hellcreek_port_txtstamp(struct dsa_switch *ds, int port,
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struct sk_buff *clone, unsigned int type);
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int hellcreek_get_ts_info(struct dsa_switch *ds, int port,
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struct ethtool_ts_info *info);
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long hellcreek_hwtstamp_work(struct ptp_clock_info *ptp);
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int hellcreek_hwtstamp_setup(struct hellcreek *chip);
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void hellcreek_hwtstamp_free(struct hellcreek *chip);
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#endif /* _HELLCREEK_HWTSTAMP_H_ */
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