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ec693d47 AV |
1 | /* |
2 | * Copyright (c) 2012 Mellanox Technologies. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | * | |
32 | */ | |
33 | ||
34 | #include <linux/mlx4/device.h> | |
d9f39373 | 35 | #include <linux/clocksource.h> |
ec693d47 AV |
36 | |
37 | #include "mlx4_en.h" | |
38 | ||
ec693d47 AV |
39 | /* mlx4_en_read_clock - read raw cycle counter (to be used by time counter) |
40 | */ | |
41 | static cycle_t mlx4_en_read_clock(const struct cyclecounter *tc) | |
42 | { | |
43 | struct mlx4_en_dev *mdev = | |
44 | container_of(tc, struct mlx4_en_dev, cycles); | |
45 | struct mlx4_dev *dev = mdev->dev; | |
46 | ||
47 | return mlx4_read_clock(dev) & tc->mask; | |
48 | } | |
49 | ||
50 | u64 mlx4_en_get_cqe_ts(struct mlx4_cqe *cqe) | |
51 | { | |
52 | u64 hi, lo; | |
53 | struct mlx4_ts_cqe *ts_cqe = (struct mlx4_ts_cqe *)cqe; | |
54 | ||
55 | lo = (u64)be16_to_cpu(ts_cqe->timestamp_lo); | |
56 | hi = ((u64)be32_to_cpu(ts_cqe->timestamp_hi) + !lo) << 16; | |
57 | ||
58 | return hi | lo; | |
59 | } | |
60 | ||
61 | void mlx4_en_fill_hwtstamps(struct mlx4_en_dev *mdev, | |
62 | struct skb_shared_hwtstamps *hwts, | |
63 | u64 timestamp) | |
64 | { | |
ad7d4eae | 65 | unsigned long flags; |
ec693d47 AV |
66 | u64 nsec; |
67 | ||
ad7d4eae | 68 | read_lock_irqsave(&mdev->clock_lock, flags); |
ec693d47 | 69 | nsec = timecounter_cyc2time(&mdev->clock, timestamp); |
ad7d4eae | 70 | read_unlock_irqrestore(&mdev->clock_lock, flags); |
ec693d47 AV |
71 | |
72 | memset(hwts, 0, sizeof(struct skb_shared_hwtstamps)); | |
73 | hwts->hwtstamp = ns_to_ktime(nsec); | |
74 | } | |
75 | ||
ad7d4eae SB |
76 | /** |
77 | * mlx4_en_remove_timestamp - disable PTP device | |
78 | * @mdev: board private structure | |
79 | * | |
80 | * Stop the PTP support. | |
81 | **/ | |
82 | void mlx4_en_remove_timestamp(struct mlx4_en_dev *mdev) | |
83 | { | |
84 | if (mdev->ptp_clock) { | |
85 | ptp_clock_unregister(mdev->ptp_clock); | |
86 | mdev->ptp_clock = NULL; | |
87 | mlx4_info(mdev, "removed PHC\n"); | |
88 | } | |
89 | } | |
90 | ||
91 | void mlx4_en_ptp_overflow_check(struct mlx4_en_dev *mdev) | |
92 | { | |
93 | bool timeout = time_is_before_jiffies(mdev->last_overflow_check + | |
94 | mdev->overflow_period); | |
95 | unsigned long flags; | |
96 | ||
97 | if (timeout) { | |
98 | write_lock_irqsave(&mdev->clock_lock, flags); | |
99 | timecounter_read(&mdev->clock); | |
100 | write_unlock_irqrestore(&mdev->clock_lock, flags); | |
101 | mdev->last_overflow_check = jiffies; | |
102 | } | |
103 | } | |
104 | ||
105 | /** | |
106 | * mlx4_en_phc_adjfreq - adjust the frequency of the hardware clock | |
107 | * @ptp: ptp clock structure | |
108 | * @delta: Desired frequency change in parts per billion | |
109 | * | |
110 | * Adjust the frequency of the PHC cycle counter by the indicated delta from | |
111 | * the base frequency. | |
112 | **/ | |
113 | static int mlx4_en_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta) | |
114 | { | |
115 | u64 adj; | |
116 | u32 diff, mult; | |
117 | int neg_adj = 0; | |
118 | unsigned long flags; | |
119 | struct mlx4_en_dev *mdev = container_of(ptp, struct mlx4_en_dev, | |
120 | ptp_clock_info); | |
121 | ||
122 | if (delta < 0) { | |
123 | neg_adj = 1; | |
124 | delta = -delta; | |
125 | } | |
126 | mult = mdev->nominal_c_mult; | |
127 | adj = mult; | |
128 | adj *= delta; | |
129 | diff = div_u64(adj, 1000000000ULL); | |
130 | ||
131 | write_lock_irqsave(&mdev->clock_lock, flags); | |
132 | timecounter_read(&mdev->clock); | |
133 | mdev->cycles.mult = neg_adj ? mult - diff : mult + diff; | |
134 | write_unlock_irqrestore(&mdev->clock_lock, flags); | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | /** | |
140 | * mlx4_en_phc_adjtime - Shift the time of the hardware clock | |
141 | * @ptp: ptp clock structure | |
142 | * @delta: Desired change in nanoseconds | |
143 | * | |
144 | * Adjust the timer by resetting the timecounter structure. | |
145 | **/ | |
146 | static int mlx4_en_phc_adjtime(struct ptp_clock_info *ptp, s64 delta) | |
147 | { | |
148 | struct mlx4_en_dev *mdev = container_of(ptp, struct mlx4_en_dev, | |
149 | ptp_clock_info); | |
150 | unsigned long flags; | |
ad7d4eae SB |
151 | |
152 | write_lock_irqsave(&mdev->clock_lock, flags); | |
ce51ff09 | 153 | timecounter_adjtime(&mdev->clock, delta); |
ad7d4eae SB |
154 | write_unlock_irqrestore(&mdev->clock_lock, flags); |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
159 | /** | |
160 | * mlx4_en_phc_gettime - Reads the current time from the hardware clock | |
161 | * @ptp: ptp clock structure | |
162 | * @ts: timespec structure to hold the current time value | |
163 | * | |
164 | * Read the timecounter and return the correct value in ns after converting | |
165 | * it into a struct timespec. | |
166 | **/ | |
167 | static int mlx4_en_phc_gettime(struct ptp_clock_info *ptp, struct timespec *ts) | |
168 | { | |
169 | struct mlx4_en_dev *mdev = container_of(ptp, struct mlx4_en_dev, | |
170 | ptp_clock_info); | |
171 | unsigned long flags; | |
172 | u32 remainder; | |
173 | u64 ns; | |
174 | ||
175 | write_lock_irqsave(&mdev->clock_lock, flags); | |
176 | ns = timecounter_read(&mdev->clock); | |
177 | write_unlock_irqrestore(&mdev->clock_lock, flags); | |
178 | ||
179 | ts->tv_sec = div_u64_rem(ns, NSEC_PER_SEC, &remainder); | |
180 | ts->tv_nsec = remainder; | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
185 | /** | |
186 | * mlx4_en_phc_settime - Set the current time on the hardware clock | |
187 | * @ptp: ptp clock structure | |
188 | * @ts: timespec containing the new time for the cycle counter | |
189 | * | |
190 | * Reset the timecounter to use a new base value instead of the kernel | |
191 | * wall timer value. | |
192 | **/ | |
193 | static int mlx4_en_phc_settime(struct ptp_clock_info *ptp, | |
194 | const struct timespec *ts) | |
195 | { | |
196 | struct mlx4_en_dev *mdev = container_of(ptp, struct mlx4_en_dev, | |
197 | ptp_clock_info); | |
198 | u64 ns = timespec_to_ns(ts); | |
199 | unsigned long flags; | |
200 | ||
201 | /* reset the timecounter */ | |
202 | write_lock_irqsave(&mdev->clock_lock, flags); | |
203 | timecounter_init(&mdev->clock, &mdev->cycles, ns); | |
204 | write_unlock_irqrestore(&mdev->clock_lock, flags); | |
205 | ||
206 | return 0; | |
207 | } | |
208 | ||
209 | /** | |
210 | * mlx4_en_phc_enable - enable or disable an ancillary feature | |
211 | * @ptp: ptp clock structure | |
212 | * @request: Desired resource to enable or disable | |
213 | * @on: Caller passes one to enable or zero to disable | |
214 | * | |
215 | * Enable (or disable) ancillary features of the PHC subsystem. | |
216 | * Currently, no ancillary features are supported. | |
217 | **/ | |
218 | static int mlx4_en_phc_enable(struct ptp_clock_info __always_unused *ptp, | |
219 | struct ptp_clock_request __always_unused *request, | |
220 | int __always_unused on) | |
221 | { | |
222 | return -EOPNOTSUPP; | |
223 | } | |
224 | ||
225 | static const struct ptp_clock_info mlx4_en_ptp_clock_info = { | |
226 | .owner = THIS_MODULE, | |
227 | .max_adj = 100000000, | |
228 | .n_alarm = 0, | |
229 | .n_ext_ts = 0, | |
230 | .n_per_out = 0, | |
4986b4f0 | 231 | .n_pins = 0, |
ad7d4eae SB |
232 | .pps = 0, |
233 | .adjfreq = mlx4_en_phc_adjfreq, | |
234 | .adjtime = mlx4_en_phc_adjtime, | |
235 | .gettime = mlx4_en_phc_gettime, | |
236 | .settime = mlx4_en_phc_settime, | |
237 | .enable = mlx4_en_phc_enable, | |
238 | }; | |
239 | ||
ec693d47 AV |
240 | void mlx4_en_init_timestamp(struct mlx4_en_dev *mdev) |
241 | { | |
242 | struct mlx4_dev *dev = mdev->dev; | |
ad7d4eae | 243 | unsigned long flags; |
2eebdde6 | 244 | u64 ns, zero = 0; |
ec693d47 | 245 | |
ad7d4eae SB |
246 | rwlock_init(&mdev->clock_lock); |
247 | ||
ec693d47 AV |
248 | memset(&mdev->cycles, 0, sizeof(mdev->cycles)); |
249 | mdev->cycles.read = mlx4_en_read_clock; | |
250 | mdev->cycles.mask = CLOCKSOURCE_MASK(48); | |
251 | /* Using shift to make calculation more accurate. Since current HW | |
252 | * clock frequency is 427 MHz, and cycles are given using a 48 bits | |
253 | * register, the biggest shift when calculating using u64, is 14 | |
254 | * (max_cycles * multiplier < 2^64) | |
255 | */ | |
256 | mdev->cycles.shift = 14; | |
257 | mdev->cycles.mult = | |
258 | clocksource_khz2mult(1000 * dev->caps.hca_core_clock, mdev->cycles.shift); | |
ad7d4eae | 259 | mdev->nominal_c_mult = mdev->cycles.mult; |
ec693d47 | 260 | |
ad7d4eae | 261 | write_lock_irqsave(&mdev->clock_lock, flags); |
ec693d47 AV |
262 | timecounter_init(&mdev->clock, &mdev->cycles, |
263 | ktime_to_ns(ktime_get_real())); | |
ad7d4eae | 264 | write_unlock_irqrestore(&mdev->clock_lock, flags); |
b6c39bfc AV |
265 | |
266 | /* Calculate period in seconds to call the overflow watchdog - to make | |
267 | * sure counter is checked at least once every wrap around. | |
268 | */ | |
2eebdde6 | 269 | ns = cyclecounter_cyc2ns(&mdev->cycles, mdev->cycles.mask, zero, &zero); |
fe86d714 ED |
270 | do_div(ns, NSEC_PER_SEC / 2 / HZ); |
271 | mdev->overflow_period = ns; | |
b6c39bfc | 272 | |
ad7d4eae SB |
273 | /* Configure the PHC */ |
274 | mdev->ptp_clock_info = mlx4_en_ptp_clock_info; | |
275 | snprintf(mdev->ptp_clock_info.name, 16, "mlx4 ptp"); | |
b6c39bfc | 276 | |
ad7d4eae SB |
277 | mdev->ptp_clock = ptp_clock_register(&mdev->ptp_clock_info, |
278 | &mdev->pdev->dev); | |
279 | if (IS_ERR(mdev->ptp_clock)) { | |
280 | mdev->ptp_clock = NULL; | |
281 | mlx4_err(mdev, "ptp_clock_register failed\n"); | |
282 | } else { | |
283 | mlx4_info(mdev, "registered PHC clock\n"); | |
b6c39bfc | 284 | } |
ad7d4eae | 285 | |
ec693d47 | 286 | } |