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fbd47be098
Adds complete support for hardware-based PTP (IEEE 1588) timestamping to the AMD XGBE driver. - Initialize and configure the MAC PTP registers based on link speed and reference clock. - Support both 50MHz and 125MHz PTP reference clocks. - Update the driver interface and version data to support PTP clock frequency selection. Signed-off-by: Raju Rangoju <Raju.Rangoju@amd.com> Link: https://patch.msgid.link/20250718185628.4038779-3-Raju.Rangoju@amd.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
145 lines
3.5 KiB
C
145 lines
3.5 KiB
C
// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-3-Clause)
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/*
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* Copyright (c) 2014-2025, Advanced Micro Devices, Inc.
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* Copyright (c) 2014, Synopsys, Inc.
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* All rights reserved
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*/
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#include <linux/clk.h>
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#include <linux/clocksource.h>
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#include <linux/ptp_clock_kernel.h>
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#include <linux/net_tstamp.h>
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#include "xgbe.h"
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#include "xgbe-common.h"
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static int xgbe_adjfine(struct ptp_clock_info *info, long scaled_ppm)
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{
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struct xgbe_prv_data *pdata = container_of(info,
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struct xgbe_prv_data,
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ptp_clock_info);
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unsigned long flags;
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u64 addend;
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addend = adjust_by_scaled_ppm(pdata->tstamp_addend, scaled_ppm);
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spin_lock_irqsave(&pdata->tstamp_lock, flags);
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xgbe_update_tstamp_addend(pdata, addend);
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spin_unlock_irqrestore(&pdata->tstamp_lock, flags);
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return 0;
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}
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static int xgbe_adjtime(struct ptp_clock_info *info, s64 delta)
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{
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struct xgbe_prv_data *pdata = container_of(info,
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struct xgbe_prv_data,
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ptp_clock_info);
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unsigned int neg_adjust = 0;
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unsigned int sec, nsec;
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u32 quotient, reminder;
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unsigned long flags;
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if (delta < 0) {
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neg_adjust = 1;
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delta = -delta;
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}
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quotient = div_u64_rem(delta, 1000000000ULL, &reminder);
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sec = quotient;
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nsec = reminder;
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/* Negative adjustment for Hw timer register. */
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if (neg_adjust) {
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sec = -sec;
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if (XGMAC_IOREAD_BITS(pdata, MAC_TSCR, TSCTRLSSR))
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nsec = (1000000000UL - nsec);
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else
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nsec = (0x80000000UL - nsec);
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}
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nsec = (neg_adjust << 31) | nsec;
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spin_lock_irqsave(&pdata->tstamp_lock, flags);
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xgbe_update_tstamp_time(pdata, sec, nsec);
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spin_unlock_irqrestore(&pdata->tstamp_lock, flags);
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return 0;
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}
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static int xgbe_gettimex(struct ptp_clock_info *info, struct timespec64 *ts,
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struct ptp_system_timestamp *sts)
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{
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struct xgbe_prv_data *pdata = container_of(info,
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struct xgbe_prv_data,
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ptp_clock_info);
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unsigned long flags;
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u64 nsec;
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spin_lock_irqsave(&pdata->tstamp_lock, flags);
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ptp_read_system_prets(sts);
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nsec = xgbe_get_tstamp_time(pdata);
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ptp_read_system_postts(sts);
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spin_unlock_irqrestore(&pdata->tstamp_lock, flags);
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*ts = ns_to_timespec64(nsec);
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return 0;
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}
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static int xgbe_settime(struct ptp_clock_info *info,
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const struct timespec64 *ts)
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{
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struct xgbe_prv_data *pdata = container_of(info,
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struct xgbe_prv_data,
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ptp_clock_info);
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unsigned long flags;
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spin_lock_irqsave(&pdata->tstamp_lock, flags);
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xgbe_set_tstamp_time(pdata, ts->tv_sec, ts->tv_nsec);
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spin_unlock_irqrestore(&pdata->tstamp_lock, flags);
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return 0;
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}
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static int xgbe_enable(struct ptp_clock_info *info,
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struct ptp_clock_request *request, int on)
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{
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return -EOPNOTSUPP;
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}
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void xgbe_ptp_register(struct xgbe_prv_data *pdata)
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{
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struct ptp_clock_info *info = &pdata->ptp_clock_info;
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struct ptp_clock *clock;
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snprintf(info->name, sizeof(info->name), "%s",
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netdev_name(pdata->netdev));
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info->owner = THIS_MODULE;
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info->max_adj = pdata->ptpclk_rate;
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info->adjfine = xgbe_adjfine;
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info->adjtime = xgbe_adjtime;
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info->gettimex64 = xgbe_gettimex;
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info->settime64 = xgbe_settime;
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info->enable = xgbe_enable;
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clock = ptp_clock_register(info, pdata->dev);
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if (IS_ERR(clock)) {
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dev_err(pdata->dev, "ptp_clock_register failed\n");
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return;
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}
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pdata->ptp_clock = clock;
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/* Disable all timestamping to start */
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XGMAC_IOWRITE(pdata, MAC_TSCR, 0);
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pdata->tstamp_config.tx_type = HWTSTAMP_TX_OFF;
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pdata->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
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}
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void xgbe_ptp_unregister(struct xgbe_prv_data *pdata)
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{
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if (pdata->ptp_clock)
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ptp_clock_unregister(pdata->ptp_clock);
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}
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