tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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}