xgbe-ptp.c

  1// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-3-Clause)
  2/*
  3 * Copyright (c) 2014-2025, Advanced Micro Devices, Inc.
  4 * Copyright (c) 2014, Synopsys, Inc.
  5 * All rights reserved
  6 */
  7
  8#include <linux/clk.h>
  9#include <linux/clocksource.h>
 10#include <linux/ptp_clock_kernel.h>
 11#include <linux/net_tstamp.h>
 12
 13#include "xgbe.h"
 14#include "xgbe-common.h"
 15
 16static int xgbe_adjfine(struct ptp_clock_info *info, long scaled_ppm)
 17{
 18	struct xgbe_prv_data *pdata = container_of(info,
 19						   struct xgbe_prv_data,
 20						   ptp_clock_info);
 21	unsigned long flags;
 22	u64 addend;
 23
 24	addend = adjust_by_scaled_ppm(pdata->tstamp_addend, scaled_ppm);
 25
 26	spin_lock_irqsave(&pdata->tstamp_lock, flags);
 27
 28	xgbe_update_tstamp_addend(pdata, addend);
 29
 30	spin_unlock_irqrestore(&pdata->tstamp_lock, flags);
 31
 32	return 0;
 33}
 34
 35static int xgbe_adjtime(struct ptp_clock_info *info, s64 delta)
 36{
 37	struct xgbe_prv_data *pdata = container_of(info,
 38						   struct xgbe_prv_data,
 39						   ptp_clock_info);
 40	unsigned int neg_adjust = 0;
 41	unsigned int sec, nsec;
 42	u32 quotient, reminder;
 43	unsigned long flags;
 44
 45	if (delta < 0) {
 46		neg_adjust = 1;
 47		delta = -delta;
 48	}
 49
 50	quotient = div_u64_rem(delta, 1000000000ULL, &reminder);
 51	sec = quotient;
 52	nsec = reminder;
 53
 54	/* Negative adjustment for Hw timer register. */
 55	if (neg_adjust) {
 56		sec = -sec;
 57		if (XGMAC_IOREAD_BITS(pdata, MAC_TSCR, TSCTRLSSR))
 58			nsec = (1000000000UL - nsec);
 59		else
 60			nsec = (0x80000000UL - nsec);
 61	}
 62	nsec = (neg_adjust << 31) | nsec;
 63
 64	spin_lock_irqsave(&pdata->tstamp_lock, flags);
 65	xgbe_update_tstamp_time(pdata, sec, nsec);
 66	spin_unlock_irqrestore(&pdata->tstamp_lock, flags);
 67
 68	return 0;
 69}
 70
 71static int xgbe_gettimex(struct ptp_clock_info *info, struct timespec64 *ts,
 72			 struct ptp_system_timestamp *sts)
 73{
 74	struct xgbe_prv_data *pdata = container_of(info,
 75						   struct xgbe_prv_data,
 76						   ptp_clock_info);
 77	unsigned long flags;
 78	u64 nsec;
 79
 80	spin_lock_irqsave(&pdata->tstamp_lock, flags);
 81	ptp_read_system_prets(sts);
 82	nsec = xgbe_get_tstamp_time(pdata);
 83	ptp_read_system_postts(sts);
 84	spin_unlock_irqrestore(&pdata->tstamp_lock, flags);
 85
 86	*ts = ns_to_timespec64(nsec);
 87
 88	return 0;
 89}
 90
 91static int xgbe_settime(struct ptp_clock_info *info,
 92			const struct timespec64 *ts)
 93{
 94	struct xgbe_prv_data *pdata = container_of(info,
 95						   struct xgbe_prv_data,
 96						   ptp_clock_info);
 97	unsigned long flags;
 98
 99	spin_lock_irqsave(&pdata->tstamp_lock, flags);
100	xgbe_set_tstamp_time(pdata, ts->tv_sec, ts->tv_nsec);
101	spin_unlock_irqrestore(&pdata->tstamp_lock, flags);
102
103	return 0;
104}
105
106static int xgbe_enable(struct ptp_clock_info *info,
107		       struct ptp_clock_request *request, int on)
108{
109	struct xgbe_prv_data *pdata = container_of(info, struct xgbe_prv_data,
110						   ptp_clock_info);
111	struct xgbe_pps_config *pps_cfg;
112	unsigned long flags;
113	int ret;
114
115	dev_dbg(pdata->dev, "rq->type %d on %d\n", request->type, on);
116
117	if (request->type != PTP_CLK_REQ_PEROUT)
118		return -EOPNOTSUPP;
119
120	pps_cfg = &pdata->pps[request->perout.index];
121
122	pps_cfg->start.tv_sec = request->perout.start.sec;
123	pps_cfg->start.tv_nsec = request->perout.start.nsec;
124	pps_cfg->period.tv_sec = request->perout.period.sec;
125	pps_cfg->period.tv_nsec = request->perout.period.nsec;
126
127	spin_lock_irqsave(&pdata->tstamp_lock, flags);
128	ret = xgbe_pps_config(pdata, pps_cfg, request->perout.index, on);
129	spin_unlock_irqrestore(&pdata->tstamp_lock, flags);
130
131	return ret;
132}
133
134void xgbe_ptp_register(struct xgbe_prv_data *pdata)
135{
136	struct ptp_clock_info *info = &pdata->ptp_clock_info;
137	struct ptp_clock *clock;
138
139	snprintf(info->name, sizeof(info->name), "%s",
140		 netdev_name(pdata->netdev));
141	info->owner = THIS_MODULE;
142	info->max_adj = pdata->ptpclk_rate;
143	info->adjfine = xgbe_adjfine;
144	info->adjtime = xgbe_adjtime;
145	info->gettimex64 = xgbe_gettimex;
146	info->settime64 = xgbe_settime;
147	info->n_per_out = pdata->hw_feat.pps_out_num;
148	info->n_ext_ts = pdata->hw_feat.aux_snap_num;
149	info->enable = xgbe_enable;
150
151	clock = ptp_clock_register(info, pdata->dev);
152	if (IS_ERR(clock)) {
153		dev_err(pdata->dev, "ptp_clock_register failed\n");
154		return;
155	}
156
157	pdata->ptp_clock = clock;
158
159	/* Disable all timestamping to start */
160	XGMAC_IOWRITE(pdata, MAC_TSCR, 0);
161	pdata->tstamp_config.tx_type = HWTSTAMP_TX_OFF;
162	pdata->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
163}
164
165void xgbe_ptp_unregister(struct xgbe_prv_data *pdata)
166{
167	if (pdata->ptp_clock)
168		ptp_clock_unregister(pdata->ptp_clock);
169}