486 строки
12 KiB
C
486 строки
12 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: Kamil Alkhouri <kamil.alkhouri@hs-offenburg.de>
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* Kurt Kanzenbach <kurt@linutronix.de>
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*/
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#include <linux/ptp_classify.h>
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#include "hellcreek.h"
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#include "hellcreek_hwtstamp.h"
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#include "hellcreek_ptp.h"
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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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{
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struct hellcreek *hellcreek = ds->priv;
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info->phc_index = hellcreek->ptp_clock ?
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ptp_clock_index(hellcreek->ptp_clock) : -1;
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info->so_timestamping = SOF_TIMESTAMPING_TX_HARDWARE |
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SOF_TIMESTAMPING_RX_HARDWARE |
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SOF_TIMESTAMPING_RAW_HARDWARE;
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/* enabled tx timestamping */
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info->tx_types = BIT(HWTSTAMP_TX_ON);
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/* L2 & L4 PTPv2 event rx messages are timestamped */
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info->rx_filters = BIT(HWTSTAMP_FILTER_PTP_V2_EVENT);
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return 0;
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}
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/* Enabling/disabling TX and RX HW timestamping for different PTP messages is
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* not available in the switch. Thus, this function only serves as a check if
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* the user requested what is actually available or not
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*/
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static int hellcreek_set_hwtstamp_config(struct hellcreek *hellcreek, int port,
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struct hwtstamp_config *config)
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{
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struct hellcreek_port_hwtstamp *ps =
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&hellcreek->ports[port].port_hwtstamp;
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bool tx_tstamp_enable = false;
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bool rx_tstamp_enable = false;
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/* Interaction with the timestamp hardware is prevented here. It is
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* enabled when this config function ends successfully
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*/
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clear_bit_unlock(HELLCREEK_HWTSTAMP_ENABLED, &ps->state);
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/* Reserved for future extensions */
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if (config->flags)
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return -EINVAL;
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switch (config->tx_type) {
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case HWTSTAMP_TX_ON:
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tx_tstamp_enable = true;
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break;
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/* TX HW timestamping can't be disabled on the switch */
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case HWTSTAMP_TX_OFF:
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config->tx_type = HWTSTAMP_TX_ON;
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break;
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default:
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return -ERANGE;
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}
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switch (config->rx_filter) {
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/* RX HW timestamping can't be disabled on the switch */
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case HWTSTAMP_FILTER_NONE:
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config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
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break;
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case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
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case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
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case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
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case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
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case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
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case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
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case HWTSTAMP_FILTER_PTP_V2_EVENT:
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case HWTSTAMP_FILTER_PTP_V2_SYNC:
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case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
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config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
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rx_tstamp_enable = true;
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break;
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/* RX HW timestamping can't be enabled for all messages on the switch */
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case HWTSTAMP_FILTER_ALL:
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config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
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break;
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default:
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return -ERANGE;
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}
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if (!tx_tstamp_enable)
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return -ERANGE;
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if (!rx_tstamp_enable)
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return -ERANGE;
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/* If this point is reached, then the requested hwtstamp config is
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* compatible with the hwtstamp offered by the switch. Therefore,
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* enable the interaction with the HW timestamping
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*/
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set_bit(HELLCREEK_HWTSTAMP_ENABLED, &ps->state);
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return 0;
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}
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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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{
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struct hellcreek *hellcreek = ds->priv;
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struct hellcreek_port_hwtstamp *ps;
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struct hwtstamp_config config;
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int err;
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ps = &hellcreek->ports[port].port_hwtstamp;
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if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
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return -EFAULT;
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err = hellcreek_set_hwtstamp_config(hellcreek, port, &config);
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if (err)
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return err;
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/* Save the chosen configuration to be returned later */
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memcpy(&ps->tstamp_config, &config, sizeof(config));
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return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
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-EFAULT : 0;
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}
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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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{
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struct hellcreek *hellcreek = ds->priv;
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struct hellcreek_port_hwtstamp *ps;
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struct hwtstamp_config *config;
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ps = &hellcreek->ports[port].port_hwtstamp;
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config = &ps->tstamp_config;
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return copy_to_user(ifr->ifr_data, config, sizeof(*config)) ?
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-EFAULT : 0;
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}
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/* Returns a pointer to the PTP header if the caller should time stamp, or NULL
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* if the caller should not.
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*/
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static struct ptp_header *hellcreek_should_tstamp(struct hellcreek *hellcreek,
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int port, struct sk_buff *skb,
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unsigned int type)
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{
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struct hellcreek_port_hwtstamp *ps =
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&hellcreek->ports[port].port_hwtstamp;
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struct ptp_header *hdr;
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hdr = ptp_parse_header(skb, type);
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if (!hdr)
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return NULL;
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if (!test_bit(HELLCREEK_HWTSTAMP_ENABLED, &ps->state))
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return NULL;
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return hdr;
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}
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static u64 hellcreek_get_reserved_field(const struct ptp_header *hdr)
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{
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return be32_to_cpu(hdr->reserved2);
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}
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static void hellcreek_clear_reserved_field(struct ptp_header *hdr)
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{
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hdr->reserved2 = 0;
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}
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static int hellcreek_ptp_hwtstamp_available(struct hellcreek *hellcreek,
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unsigned int ts_reg)
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{
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u16 status;
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status = hellcreek_ptp_read(hellcreek, ts_reg);
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if (status & PR_TS_STATUS_TS_LOST)
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dev_err(hellcreek->dev,
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"Tx time stamp lost! This should never happen!\n");
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/* If hwtstamp is not available, this means the previous hwtstamp was
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* successfully read, and the one we need is not yet available
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*/
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return (status & PR_TS_STATUS_TS_AVAIL) ? 1 : 0;
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}
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/* Get nanoseconds timestamp from timestamping unit */
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static u64 hellcreek_ptp_hwtstamp_read(struct hellcreek *hellcreek,
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unsigned int ts_reg)
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{
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u16 nsl, nsh;
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nsh = hellcreek_ptp_read(hellcreek, ts_reg);
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nsh = hellcreek_ptp_read(hellcreek, ts_reg);
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nsh = hellcreek_ptp_read(hellcreek, ts_reg);
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nsh = hellcreek_ptp_read(hellcreek, ts_reg);
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nsl = hellcreek_ptp_read(hellcreek, ts_reg);
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return (u64)nsl | ((u64)nsh << 16);
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}
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static int hellcreek_txtstamp_work(struct hellcreek *hellcreek,
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struct hellcreek_port_hwtstamp *ps, int port)
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{
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struct skb_shared_hwtstamps shhwtstamps;
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unsigned int status_reg, data_reg;
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struct sk_buff *tmp_skb;
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int ts_status;
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u64 ns = 0;
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if (!ps->tx_skb)
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return 0;
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switch (port) {
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case 2:
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status_reg = PR_TS_TX_P1_STATUS_C;
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data_reg = PR_TS_TX_P1_DATA_C;
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break;
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case 3:
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status_reg = PR_TS_TX_P2_STATUS_C;
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data_reg = PR_TS_TX_P2_DATA_C;
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break;
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default:
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dev_err(hellcreek->dev, "Wrong port for timestamping!\n");
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return 0;
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}
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ts_status = hellcreek_ptp_hwtstamp_available(hellcreek, status_reg);
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/* Not available yet? */
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if (ts_status == 0) {
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/* Check whether the operation of reading the tx timestamp has
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* exceeded its allowed period
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*/
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if (time_is_before_jiffies(ps->tx_tstamp_start +
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TX_TSTAMP_TIMEOUT)) {
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dev_err(hellcreek->dev,
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"Timeout while waiting for Tx timestamp!\n");
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goto free_and_clear_skb;
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}
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/* The timestamp should be available quickly, while getting it
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* in high priority. Restart the work
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*/
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return 1;
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}
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mutex_lock(&hellcreek->ptp_lock);
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ns = hellcreek_ptp_hwtstamp_read(hellcreek, data_reg);
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ns += hellcreek_ptp_gettime_seconds(hellcreek, ns);
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mutex_unlock(&hellcreek->ptp_lock);
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/* Now we have the timestamp in nanoseconds, store it in the correct
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* structure in order to send it to the user
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*/
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memset(&shhwtstamps, 0, sizeof(shhwtstamps));
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shhwtstamps.hwtstamp = ns_to_ktime(ns);
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tmp_skb = ps->tx_skb;
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ps->tx_skb = NULL;
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/* skb_complete_tx_timestamp() frees up the client to make another
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* timestampable transmit. We have to be ready for it by clearing the
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* ps->tx_skb "flag" beforehand
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*/
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clear_bit_unlock(HELLCREEK_HWTSTAMP_TX_IN_PROGRESS, &ps->state);
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/* Deliver a clone of the original outgoing tx_skb with tx hwtstamp */
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skb_complete_tx_timestamp(tmp_skb, &shhwtstamps);
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return 0;
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free_and_clear_skb:
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dev_kfree_skb_any(ps->tx_skb);
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ps->tx_skb = NULL;
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clear_bit_unlock(HELLCREEK_HWTSTAMP_TX_IN_PROGRESS, &ps->state);
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return 0;
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}
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static void hellcreek_get_rxts(struct hellcreek *hellcreek,
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struct hellcreek_port_hwtstamp *ps,
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struct sk_buff *skb, struct sk_buff_head *rxq,
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int port)
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{
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struct skb_shared_hwtstamps *shwt;
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struct sk_buff_head received;
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unsigned long flags;
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/* The latched timestamp belongs to one of the received frames. */
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__skb_queue_head_init(&received);
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/* Lock & disable interrupts */
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spin_lock_irqsave(&rxq->lock, flags);
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/* Add the reception queue "rxq" to the "received" queue an reintialize
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* "rxq". From now on, we deal with "received" not with "rxq"
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*/
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skb_queue_splice_tail_init(rxq, &received);
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spin_unlock_irqrestore(&rxq->lock, flags);
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for (; skb; skb = __skb_dequeue(&received)) {
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struct ptp_header *hdr;
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unsigned int type;
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u64 ns;
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/* Get nanoseconds from ptp packet */
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type = SKB_PTP_TYPE(skb);
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hdr = ptp_parse_header(skb, type);
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ns = hellcreek_get_reserved_field(hdr);
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hellcreek_clear_reserved_field(hdr);
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/* Add seconds part */
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mutex_lock(&hellcreek->ptp_lock);
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ns += hellcreek_ptp_gettime_seconds(hellcreek, ns);
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mutex_unlock(&hellcreek->ptp_lock);
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/* Save time stamp */
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shwt = skb_hwtstamps(skb);
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memset(shwt, 0, sizeof(*shwt));
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shwt->hwtstamp = ns_to_ktime(ns);
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netif_rx_ni(skb);
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}
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}
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static void hellcreek_rxtstamp_work(struct hellcreek *hellcreek,
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struct hellcreek_port_hwtstamp *ps,
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int port)
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{
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struct sk_buff *skb;
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skb = skb_dequeue(&ps->rx_queue);
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if (skb)
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hellcreek_get_rxts(hellcreek, ps, skb, &ps->rx_queue, port);
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}
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long hellcreek_hwtstamp_work(struct ptp_clock_info *ptp)
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{
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struct hellcreek *hellcreek = ptp_to_hellcreek(ptp);
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struct dsa_switch *ds = hellcreek->ds;
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int i, restart = 0;
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for (i = 0; i < ds->num_ports; i++) {
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struct hellcreek_port_hwtstamp *ps;
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if (!dsa_is_user_port(ds, i))
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continue;
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ps = &hellcreek->ports[i].port_hwtstamp;
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if (test_bit(HELLCREEK_HWTSTAMP_TX_IN_PROGRESS, &ps->state))
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restart |= hellcreek_txtstamp_work(hellcreek, ps, i);
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hellcreek_rxtstamp_work(hellcreek, ps, i);
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}
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return restart ? 1 : -1;
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}
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void hellcreek_port_txtstamp(struct dsa_switch *ds, int port,
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struct sk_buff *skb)
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{
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struct hellcreek *hellcreek = ds->priv;
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struct hellcreek_port_hwtstamp *ps;
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struct ptp_header *hdr;
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struct sk_buff *clone;
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unsigned int type;
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ps = &hellcreek->ports[port].port_hwtstamp;
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type = ptp_classify_raw(skb);
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if (type == PTP_CLASS_NONE)
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return;
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/* Make sure the message is a PTP message that needs to be timestamped
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* and the interaction with the HW timestamping is enabled. If not, stop
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* here
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*/
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hdr = hellcreek_should_tstamp(hellcreek, port, skb, type);
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if (!hdr)
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return;
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clone = skb_clone_sk(skb);
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if (!clone)
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return;
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if (test_and_set_bit_lock(HELLCREEK_HWTSTAMP_TX_IN_PROGRESS,
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&ps->state)) {
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kfree_skb(clone);
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return;
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}
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ps->tx_skb = clone;
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/* store the number of ticks occurred since system start-up till this
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* moment
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*/
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ps->tx_tstamp_start = jiffies;
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ptp_schedule_worker(hellcreek->ptp_clock, 0);
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}
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bool hellcreek_port_rxtstamp(struct dsa_switch *ds, int port,
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struct sk_buff *skb, unsigned int type)
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{
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struct hellcreek *hellcreek = ds->priv;
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struct hellcreek_port_hwtstamp *ps;
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struct ptp_header *hdr;
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ps = &hellcreek->ports[port].port_hwtstamp;
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/* This check only fails if the user did not initialize hardware
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* timestamping beforehand.
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*/
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if (ps->tstamp_config.rx_filter != HWTSTAMP_FILTER_PTP_V2_EVENT)
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return false;
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/* Make sure the message is a PTP message that needs to be timestamped
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* and the interaction with the HW timestamping is enabled. If not, stop
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* here
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*/
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hdr = hellcreek_should_tstamp(hellcreek, port, skb, type);
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if (!hdr)
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return false;
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SKB_PTP_TYPE(skb) = type;
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skb_queue_tail(&ps->rx_queue, skb);
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ptp_schedule_worker(hellcreek->ptp_clock, 0);
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return true;
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}
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static void hellcreek_hwtstamp_port_setup(struct hellcreek *hellcreek, int port)
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{
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struct hellcreek_port_hwtstamp *ps =
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&hellcreek->ports[port].port_hwtstamp;
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skb_queue_head_init(&ps->rx_queue);
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}
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int hellcreek_hwtstamp_setup(struct hellcreek *hellcreek)
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{
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struct dsa_switch *ds = hellcreek->ds;
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int i;
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/* Initialize timestamping ports. */
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for (i = 0; i < ds->num_ports; ++i) {
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if (!dsa_is_user_port(ds, i))
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continue;
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hellcreek_hwtstamp_port_setup(hellcreek, i);
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}
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/* Select the synchronized clock as the source timekeeper for the
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* timestamps and enable inline timestamping.
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*/
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hellcreek_ptp_write(hellcreek, PR_SETTINGS_C_TS_SRC_TK_MASK |
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PR_SETTINGS_C_RES3TS,
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PR_SETTINGS_C);
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return 0;
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}
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void hellcreek_hwtstamp_free(struct hellcreek *hellcreek)
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{
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/* Nothing todo */
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}
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