1 /*******************************************************************************
2 PTP 1588 clock using the STMMAC.
4 Copyright (C) 2013 Vayavya Labs Pvt Ltd
6 This program is free software; you can redistribute it and/or modify it
7 under the terms and conditions of the GNU General Public License,
8 version 2, as published by the Free Software Foundation.
10 This program is distributed in the hope it will be useful, but WITHOUT
11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 The full GNU General Public License is included in this distribution in
16 the file called "COPYING".
18 Author: Rayagond Kokatanur <rayagond@vayavyalabs.com>
19 *******************************************************************************/
21 #include "stmmac_ptp.h"
26 * @ptp: pointer to ptp_clock_info structure
27 * @ppb: desired period change in parts ber billion
29 * Description: this function will adjust the frequency of hardware clock.
31 static int stmmac_adjust_freq(struct ptp_clock_info *ptp, s32 ppb)
33 struct stmmac_priv *priv =
34 container_of(ptp, struct stmmac_priv, ptp_clock_ops);
45 addend = priv->default_addend;
48 diff = div_u64(adj, 1000000000ULL);
49 addend = neg_adj ? (addend - diff) : (addend + diff);
51 spin_lock_irqsave(&priv->ptp_lock, flags);
53 priv->hw->ptp->config_addend(priv->ptpaddr, addend);
55 spin_unlock_irqrestore(&priv->ptp_lock, flags);
63 * @ptp: pointer to ptp_clock_info structure
64 * @delta: desired change in nanoseconds
66 * Description: this function will shift/adjust the hardware clock time.
68 static int stmmac_adjust_time(struct ptp_clock_info *ptp, s64 delta)
70 struct stmmac_priv *priv =
71 container_of(ptp, struct stmmac_priv, ptp_clock_ops);
74 u32 quotient, reminder;
82 quotient = div_u64_rem(delta, 1000000000ULL, &reminder);
86 spin_lock_irqsave(&priv->ptp_lock, flags);
88 priv->hw->ptp->adjust_systime(priv->ptpaddr, sec, nsec, neg_adj,
89 priv->plat->has_gmac4);
91 spin_unlock_irqrestore(&priv->ptp_lock, flags);
99 * @ptp: pointer to ptp_clock_info structure
100 * @ts: pointer to hold time/result
102 * Description: this function will read the current time from the
103 * hardware clock and store it in @ts.
105 static int stmmac_get_time(struct ptp_clock_info *ptp, struct timespec64 *ts)
107 struct stmmac_priv *priv =
108 container_of(ptp, struct stmmac_priv, ptp_clock_ops);
112 spin_lock_irqsave(&priv->ptp_lock, flags);
114 ns = priv->hw->ptp->get_systime(priv->ptpaddr);
116 spin_unlock_irqrestore(&priv->ptp_lock, flags);
118 *ts = ns_to_timespec64(ns);
126 * @ptp: pointer to ptp_clock_info structure
127 * @ts: time value to set
129 * Description: this function will set the current time on the
132 static int stmmac_set_time(struct ptp_clock_info *ptp,
133 const struct timespec64 *ts)
135 struct stmmac_priv *priv =
136 container_of(ptp, struct stmmac_priv, ptp_clock_ops);
139 spin_lock_irqsave(&priv->ptp_lock, flags);
141 priv->hw->ptp->init_systime(priv->ptpaddr, ts->tv_sec, ts->tv_nsec);
143 spin_unlock_irqrestore(&priv->ptp_lock, flags);
148 static int stmmac_enable(struct ptp_clock_info *ptp,
149 struct ptp_clock_request *rq, int on)
154 /* structure describing a PTP hardware clock */
155 static const struct ptp_clock_info stmmac_ptp_clock_ops = {
156 .owner = THIS_MODULE,
157 .name = "stmmac_ptp_clock",
164 .adjfreq = stmmac_adjust_freq,
165 .adjtime = stmmac_adjust_time,
166 .gettime64 = stmmac_get_time,
167 .settime64 = stmmac_set_time,
168 .enable = stmmac_enable,
172 * stmmac_ptp_register
173 * @priv: driver private structure
174 * Description: this function will register the ptp clock driver
175 * to kernel. It also does some house keeping work.
177 void stmmac_ptp_register(struct stmmac_priv *priv)
179 spin_lock_init(&priv->ptp_lock);
180 priv->ptp_clock_ops = stmmac_ptp_clock_ops;
182 priv->ptp_clock = ptp_clock_register(&priv->ptp_clock_ops,
184 if (IS_ERR(priv->ptp_clock)) {
185 netdev_err(priv->dev, "ptp_clock_register failed\n");
186 priv->ptp_clock = NULL;
187 } else if (priv->ptp_clock)
188 netdev_info(priv->dev, "registered PTP clock\n");
192 * stmmac_ptp_unregister
193 * @priv: driver private structure
194 * Description: this function will remove/unregister the ptp clock driver
197 void stmmac_ptp_unregister(struct stmmac_priv *priv)
199 if (priv->ptp_clock) {
200 ptp_clock_unregister(priv->ptp_clock);
201 priv->ptp_clock = NULL;
202 pr_debug("Removed PTP HW clock successfully on %s\n",