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
xgbe_adjfine(struct ptp_clock_info * info,long scaled_ppm)16 static 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
xgbe_adjtime(struct ptp_clock_info * info,s64 delta)35 static 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
xgbe_gettimex(struct ptp_clock_info * info,struct timespec64 * ts,struct ptp_system_timestamp * sts)71 static 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
xgbe_settime(struct ptp_clock_info * info,const struct timespec64 * ts)91 static 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
xgbe_enable(struct ptp_clock_info * info,struct ptp_clock_request * request,int on)106 static int xgbe_enable(struct ptp_clock_info *info,
107 struct ptp_clock_request *request, int on)
108 {
109 return -EOPNOTSUPP;
110 }
111
xgbe_ptp_register(struct xgbe_prv_data * pdata)112 void xgbe_ptp_register(struct xgbe_prv_data *pdata)
113 {
114 struct ptp_clock_info *info = &pdata->ptp_clock_info;
115 struct ptp_clock *clock;
116
117 snprintf(info->name, sizeof(info->name), "%s",
118 netdev_name(pdata->netdev));
119 info->owner = THIS_MODULE;
120 info->max_adj = pdata->ptpclk_rate;
121 info->adjfine = xgbe_adjfine;
122 info->adjtime = xgbe_adjtime;
123 info->gettimex64 = xgbe_gettimex;
124 info->settime64 = xgbe_settime;
125 info->enable = xgbe_enable;
126
127 clock = ptp_clock_register(info, pdata->dev);
128 if (IS_ERR(clock)) {
129 dev_err(pdata->dev, "ptp_clock_register failed\n");
130 return;
131 }
132
133 pdata->ptp_clock = clock;
134
135 /* Disable all timestamping to start */
136 XGMAC_IOWRITE(pdata, MAC_TSCR, 0);
137 pdata->tstamp_config.tx_type = HWTSTAMP_TX_OFF;
138 pdata->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
139 }
140
xgbe_ptp_unregister(struct xgbe_prv_data * pdata)141 void xgbe_ptp_unregister(struct xgbe_prv_data *pdata)
142 {
143 if (pdata->ptp_clock)
144 ptp_clock_unregister(pdata->ptp_clock);
145 }
146