summaryrefslogtreecommitdiffstats
path: root/drivers/net/ethernet/amd/xgbe/xgbe-ptp.c
blob: f326178ef3760122f034a27d5c5afeda4eb9aa70 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
/*
 * AMD 10Gb Ethernet driver
 *
 * This file is available to you under your choice of the following two
 * licenses:
 *
 * License 1: GPLv2
 *
 * Copyright (c) 2014 Advanced Micro Devices, Inc.
 *
 * This file is free software; you may copy, redistribute and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or (at
 * your option) any later version.
 *
 * This file is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *     The Synopsys DWC ETHER XGMAC Software Driver and documentation
 *     (hereinafter "Software") is an unsupported proprietary work of Synopsys,
 *     Inc. unless otherwise expressly agreed to in writing between Synopsys
 *     and you.
 *
 *     The Software IS NOT an item of Licensed Software or Licensed Product
 *     under any End User Software License Agreement or Agreement for Licensed
 *     Product with Synopsys or any supplement thereto.  Permission is hereby
 *     granted, free of charge, to any person obtaining a copy of this software
 *     annotated with this license and the Software, to deal in the Software
 *     without restriction, including without limitation the rights to use,
 *     copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 *     of the Software, and to permit persons to whom the Software is furnished
 *     to do so, subject to the following conditions:
 *
 *     The above copyright notice and this permission notice shall be included
 *     in all copies or substantial portions of the Software.
 *
 *     THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
 *     BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 *     TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 *     PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
 *     BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *     SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *     INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 *     THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 * License 2: Modified BSD
 *
 * Copyright (c) 2014 Advanced Micro Devices, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Advanced Micro Devices, Inc. nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *     The Synopsys DWC ETHER XGMAC Software Driver and documentation
 *     (hereinafter "Software") is an unsupported proprietary work of Synopsys,
 *     Inc. unless otherwise expressly agreed to in writing between Synopsys
 *     and you.
 *
 *     The Software IS NOT an item of Licensed Software or Licensed Product
 *     under any End User Software License Agreement or Agreement for Licensed
 *     Product with Synopsys or any supplement thereto.  Permission is hereby
 *     granted, free of charge, to any person obtaining a copy of this software
 *     annotated with this license and the Software, to deal in the Software
 *     without restriction, including without limitation the rights to use,
 *     copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 *     of the Software, and to permit persons to whom the Software is furnished
 *     to do so, subject to the following conditions:
 *
 *     The above copyright notice and this permission notice shall be included
 *     in all copies or substantial portions of the Software.
 *
 *     THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
 *     BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 *     TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 *     PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
 *     BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *     SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *     INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 *     THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/clk.h>
#include <linux/clocksource.h>
#include <linux/ptp_clock_kernel.h>
#include <linux/net_tstamp.h>

#include "xgbe.h"
#include "xgbe-common.h"

static cycle_t xgbe_cc_read(const struct cyclecounter *cc)
{
	struct xgbe_prv_data *pdata = container_of(cc,
						   struct xgbe_prv_data,
						   tstamp_cc);
	u64 nsec;

	nsec = pdata->hw_if.get_tstamp_time(pdata);

	return nsec;
}

static int xgbe_adjfreq(struct ptp_clock_info *info, s32 delta)
{
	struct xgbe_prv_data *pdata = container_of(info,
						   struct xgbe_prv_data,
						   ptp_clock_info);
	unsigned long flags;
	u64 adjust;
	u32 addend, diff;
	unsigned int neg_adjust = 0;

	if (delta < 0) {
		neg_adjust = 1;
		delta = -delta;
	}

	adjust = pdata->tstamp_addend;
	adjust *= delta;
	diff = div_u64(adjust, 1000000000UL);

	addend = (neg_adjust) ? pdata->tstamp_addend - diff :
				pdata->tstamp_addend + diff;

	spin_lock_irqsave(&pdata->tstamp_lock, flags);

	pdata->hw_if.update_tstamp_addend(pdata, addend);

	spin_unlock_irqrestore(&pdata->tstamp_lock, flags);

	return 0;
}

static int xgbe_adjtime(struct ptp_clock_info *info, s64 delta)
{
	struct xgbe_prv_data *pdata = container_of(info,
						   struct xgbe_prv_data,
						   ptp_clock_info);
	unsigned long flags;

	spin_lock_irqsave(&pdata->tstamp_lock, flags);
	timecounter_adjtime(&pdata->tstamp_tc, delta);
	spin_unlock_irqrestore(&pdata->tstamp_lock, flags);

	return 0;
}

static int xgbe_gettime(struct ptp_clock_info *info, struct timespec *ts)
{
	struct xgbe_prv_data *pdata = container_of(info,
						   struct xgbe_prv_data,
						   ptp_clock_info);
	unsigned long flags;
	u64 nsec;

	spin_lock_irqsave(&pdata->tstamp_lock, flags);

	nsec = timecounter_read(&pdata->tstamp_tc);

	spin_unlock_irqrestore(&pdata->tstamp_lock, flags);

	*ts = ns_to_timespec(nsec);

	return 0;
}

static int xgbe_settime(struct ptp_clock_info *info, const struct timespec *ts)
{
	struct xgbe_prv_data *pdata = container_of(info,
						   struct xgbe_prv_data,
						   ptp_clock_info);
	unsigned long flags;
	u64 nsec;

	nsec = timespec_to_ns(ts);

	spin_lock_irqsave(&pdata->tstamp_lock, flags);

	timecounter_init(&pdata->tstamp_tc, &pdata->tstamp_cc, nsec);

	spin_unlock_irqrestore(&pdata->tstamp_lock, flags);

	return 0;
}

static int xgbe_enable(struct ptp_clock_info *info,
		       struct ptp_clock_request *request, int on)
{
	return -EOPNOTSUPP;
}

void xgbe_ptp_register(struct xgbe_prv_data *pdata)
{
	struct ptp_clock_info *info = &pdata->ptp_clock_info;
	struct ptp_clock *clock;
	struct cyclecounter *cc = &pdata->tstamp_cc;
	u64 dividend;

	snprintf(info->name, sizeof(info->name), "%s",
		 netdev_name(pdata->netdev));
	info->owner = THIS_MODULE;
	info->max_adj = pdata->ptpclk_rate;
	info->adjfreq = xgbe_adjfreq;
	info->adjtime = xgbe_adjtime;
	info->gettime = xgbe_gettime;
	info->settime = xgbe_settime;
	info->enable = xgbe_enable;

	clock = ptp_clock_register(info, pdata->dev);
	if (IS_ERR(clock)) {
		dev_err(pdata->dev, "ptp_clock_register failed\n");
		return;
	}

	pdata->ptp_clock = clock;

	/* Calculate the addend:
	 *   addend = 2^32 / (PTP ref clock / 50Mhz)
	 *          = (2^32 * 50Mhz) / PTP ref clock
	 */
	dividend = 50000000;
	dividend <<= 32;
	pdata->tstamp_addend = div_u64(dividend, pdata->ptpclk_rate);

	/* Setup the timecounter */
	cc->read = xgbe_cc_read;
	cc->mask = CLOCKSOURCE_MASK(64);
	cc->mult = 1;
	cc->shift = 0;

	timecounter_init(&pdata->tstamp_tc, &pdata->tstamp_cc,
			 ktime_to_ns(ktime_get_real()));

	/* Disable all timestamping to start */
	XGMAC_IOWRITE(pdata, MAC_TCR, 0);
	pdata->tstamp_config.tx_type = HWTSTAMP_TX_OFF;
	pdata->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
}

void xgbe_ptp_unregister(struct xgbe_prv_data *pdata)
{
	if (pdata->ptp_clock)
		ptp_clock_unregister(pdata->ptp_clock);
}