|
1 /******************************************************************************* |
|
2 |
|
3 Intel PRO/1000 Linux driver |
|
4 Copyright(c) 1999 - 2013 Intel Corporation. |
|
5 |
|
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. |
|
9 |
|
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 |
|
13 more details. |
|
14 |
|
15 You should have received a copy of the GNU General Public License along with |
|
16 this program; if not, write to the Free Software Foundation, Inc., |
|
17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
|
18 |
|
19 The full GNU General Public License is included in this distribution in |
|
20 the file called "COPYING". |
|
21 |
|
22 Contact Information: |
|
23 Linux NICS <linux.nics@intel.com> |
|
24 e1000-devel Mailing List <e1000-devel@lists.sourceforge.net> |
|
25 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 |
|
26 |
|
27 *******************************************************************************/ |
|
28 |
|
29 /* PTP 1588 Hardware Clock (PHC) |
|
30 * Derived from PTP Hardware Clock driver for Intel 82576 and 82580 (igb) |
|
31 * Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com> |
|
32 */ |
|
33 |
|
34 #include "e1000-3.12-ethercat.h" |
|
35 |
|
36 /** |
|
37 * e1000e_phc_adjfreq - adjust the frequency of the hardware clock |
|
38 * @ptp: ptp clock structure |
|
39 * @delta: Desired frequency change in parts per billion |
|
40 * |
|
41 * Adjust the frequency of the PHC cycle counter by the indicated delta from |
|
42 * the base frequency. |
|
43 **/ |
|
44 static int e1000e_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta) |
|
45 { |
|
46 struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter, |
|
47 ptp_clock_info); |
|
48 struct e1000_hw *hw = &adapter->hw; |
|
49 bool neg_adj = false; |
|
50 u64 adjustment; |
|
51 u32 timinca, incvalue; |
|
52 s32 ret_val; |
|
53 |
|
54 if ((delta > ptp->max_adj) || (delta <= -1000000000)) |
|
55 return -EINVAL; |
|
56 |
|
57 if (delta < 0) { |
|
58 neg_adj = true; |
|
59 delta = -delta; |
|
60 } |
|
61 |
|
62 /* Get the System Time Register SYSTIM base frequency */ |
|
63 ret_val = e1000e_get_base_timinca(adapter, &timinca); |
|
64 if (ret_val) |
|
65 return ret_val; |
|
66 |
|
67 incvalue = timinca & E1000_TIMINCA_INCVALUE_MASK; |
|
68 |
|
69 adjustment = incvalue; |
|
70 adjustment *= delta; |
|
71 adjustment = div_u64(adjustment, 1000000000); |
|
72 |
|
73 incvalue = neg_adj ? (incvalue - adjustment) : (incvalue + adjustment); |
|
74 |
|
75 timinca &= ~E1000_TIMINCA_INCVALUE_MASK; |
|
76 timinca |= incvalue; |
|
77 |
|
78 ew32(TIMINCA, timinca); |
|
79 |
|
80 return 0; |
|
81 } |
|
82 |
|
83 /** |
|
84 * e1000e_phc_adjtime - Shift the time of the hardware clock |
|
85 * @ptp: ptp clock structure |
|
86 * @delta: Desired change in nanoseconds |
|
87 * |
|
88 * Adjust the timer by resetting the timecounter structure. |
|
89 **/ |
|
90 static int e1000e_phc_adjtime(struct ptp_clock_info *ptp, s64 delta) |
|
91 { |
|
92 struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter, |
|
93 ptp_clock_info); |
|
94 unsigned long flags; |
|
95 s64 now; |
|
96 |
|
97 spin_lock_irqsave(&adapter->systim_lock, flags); |
|
98 now = timecounter_read(&adapter->tc); |
|
99 now += delta; |
|
100 timecounter_init(&adapter->tc, &adapter->cc, now); |
|
101 spin_unlock_irqrestore(&adapter->systim_lock, flags); |
|
102 |
|
103 return 0; |
|
104 } |
|
105 |
|
106 /** |
|
107 * e1000e_phc_gettime - Reads the current time from the hardware clock |
|
108 * @ptp: ptp clock structure |
|
109 * @ts: timespec structure to hold the current time value |
|
110 * |
|
111 * Read the timecounter and return the correct value in ns after converting |
|
112 * it into a struct timespec. |
|
113 **/ |
|
114 static int e1000e_phc_gettime(struct ptp_clock_info *ptp, struct timespec *ts) |
|
115 { |
|
116 struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter, |
|
117 ptp_clock_info); |
|
118 unsigned long flags; |
|
119 u32 remainder; |
|
120 u64 ns; |
|
121 |
|
122 spin_lock_irqsave(&adapter->systim_lock, flags); |
|
123 ns = timecounter_read(&adapter->tc); |
|
124 spin_unlock_irqrestore(&adapter->systim_lock, flags); |
|
125 |
|
126 ts->tv_sec = div_u64_rem(ns, NSEC_PER_SEC, &remainder); |
|
127 ts->tv_nsec = remainder; |
|
128 |
|
129 return 0; |
|
130 } |
|
131 |
|
132 /** |
|
133 * e1000e_phc_settime - Set the current time on the hardware clock |
|
134 * @ptp: ptp clock structure |
|
135 * @ts: timespec containing the new time for the cycle counter |
|
136 * |
|
137 * Reset the timecounter to use a new base value instead of the kernel |
|
138 * wall timer value. |
|
139 **/ |
|
140 static int e1000e_phc_settime(struct ptp_clock_info *ptp, |
|
141 const struct timespec *ts) |
|
142 { |
|
143 struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter, |
|
144 ptp_clock_info); |
|
145 unsigned long flags; |
|
146 u64 ns; |
|
147 |
|
148 ns = timespec_to_ns(ts); |
|
149 |
|
150 /* reset the timecounter */ |
|
151 spin_lock_irqsave(&adapter->systim_lock, flags); |
|
152 timecounter_init(&adapter->tc, &adapter->cc, ns); |
|
153 spin_unlock_irqrestore(&adapter->systim_lock, flags); |
|
154 |
|
155 return 0; |
|
156 } |
|
157 |
|
158 /** |
|
159 * e1000e_phc_enable - enable or disable an ancillary feature |
|
160 * @ptp: ptp clock structure |
|
161 * @request: Desired resource to enable or disable |
|
162 * @on: Caller passes one to enable or zero to disable |
|
163 * |
|
164 * Enable (or disable) ancillary features of the PHC subsystem. |
|
165 * Currently, no ancillary features are supported. |
|
166 **/ |
|
167 static int e1000e_phc_enable(struct ptp_clock_info __always_unused *ptp, |
|
168 struct ptp_clock_request __always_unused *request, |
|
169 int __always_unused on) |
|
170 { |
|
171 return -EOPNOTSUPP; |
|
172 } |
|
173 |
|
174 static void e1000e_systim_overflow_work(struct work_struct *work) |
|
175 { |
|
176 struct e1000_adapter *adapter = container_of(work, struct e1000_adapter, |
|
177 systim_overflow_work.work); |
|
178 struct e1000_hw *hw = &adapter->hw; |
|
179 struct timespec ts; |
|
180 |
|
181 adapter->ptp_clock_info.gettime(&adapter->ptp_clock_info, &ts); |
|
182 |
|
183 e_dbg("SYSTIM overflow check at %ld.%09lu\n", ts.tv_sec, ts.tv_nsec); |
|
184 |
|
185 schedule_delayed_work(&adapter->systim_overflow_work, |
|
186 E1000_SYSTIM_OVERFLOW_PERIOD); |
|
187 } |
|
188 |
|
189 static const struct ptp_clock_info e1000e_ptp_clock_info = { |
|
190 .owner = THIS_MODULE, |
|
191 .n_alarm = 0, |
|
192 .n_ext_ts = 0, |
|
193 .n_per_out = 0, |
|
194 .pps = 0, |
|
195 .adjfreq = e1000e_phc_adjfreq, |
|
196 .adjtime = e1000e_phc_adjtime, |
|
197 .gettime = e1000e_phc_gettime, |
|
198 .settime = e1000e_phc_settime, |
|
199 .enable = e1000e_phc_enable, |
|
200 }; |
|
201 |
|
202 /** |
|
203 * e1000e_ptp_init - initialize PTP for devices which support it |
|
204 * @adapter: board private structure |
|
205 * |
|
206 * This function performs the required steps for enabling PTP support. |
|
207 * If PTP support has already been loaded it simply calls the cyclecounter |
|
208 * init routine and exits. |
|
209 **/ |
|
210 void e1000e_ptp_init(struct e1000_adapter *adapter) |
|
211 { |
|
212 struct e1000_hw *hw = &adapter->hw; |
|
213 |
|
214 adapter->ptp_clock = NULL; |
|
215 |
|
216 if (!(adapter->flags & FLAG_HAS_HW_TIMESTAMP)) |
|
217 return; |
|
218 |
|
219 adapter->ptp_clock_info = e1000e_ptp_clock_info; |
|
220 |
|
221 snprintf(adapter->ptp_clock_info.name, |
|
222 sizeof(adapter->ptp_clock_info.name), "%pm", |
|
223 adapter->netdev->perm_addr); |
|
224 |
|
225 switch (hw->mac.type) { |
|
226 case e1000_pch2lan: |
|
227 case e1000_pch_lpt: |
|
228 if ((hw->mac.type != e1000_pch_lpt) || |
|
229 (er32(TSYNCRXCTL) & E1000_TSYNCRXCTL_SYSCFI)) { |
|
230 adapter->ptp_clock_info.max_adj = 24000000 - 1; |
|
231 break; |
|
232 } |
|
233 /* fall-through */ |
|
234 case e1000_82574: |
|
235 case e1000_82583: |
|
236 adapter->ptp_clock_info.max_adj = 600000000 - 1; |
|
237 break; |
|
238 default: |
|
239 break; |
|
240 } |
|
241 |
|
242 INIT_DELAYED_WORK(&adapter->systim_overflow_work, |
|
243 e1000e_systim_overflow_work); |
|
244 |
|
245 schedule_delayed_work(&adapter->systim_overflow_work, |
|
246 E1000_SYSTIM_OVERFLOW_PERIOD); |
|
247 |
|
248 adapter->ptp_clock = ptp_clock_register(&adapter->ptp_clock_info, |
|
249 &adapter->pdev->dev); |
|
250 if (IS_ERR(adapter->ptp_clock)) { |
|
251 adapter->ptp_clock = NULL; |
|
252 e_err("ptp_clock_register failed\n"); |
|
253 } else { |
|
254 e_info("registered PHC clock\n"); |
|
255 } |
|
256 } |
|
257 |
|
258 /** |
|
259 * e1000e_ptp_remove - disable PTP device and stop the overflow check |
|
260 * @adapter: board private structure |
|
261 * |
|
262 * Stop the PTP support, and cancel the delayed work. |
|
263 **/ |
|
264 void e1000e_ptp_remove(struct e1000_adapter *adapter) |
|
265 { |
|
266 if (!(adapter->flags & FLAG_HAS_HW_TIMESTAMP)) |
|
267 return; |
|
268 |
|
269 cancel_delayed_work_sync(&adapter->systim_overflow_work); |
|
270 |
|
271 if (adapter->ptp_clock) { |
|
272 ptp_clock_unregister(adapter->ptp_clock); |
|
273 adapter->ptp_clock = NULL; |
|
274 e_info("removed PHC\n"); |
|
275 } |
|
276 } |