1 /* PTP 1588 clock using the Renesas Ethernet AVB
3 * Copyright (C) 2013-2015 Renesas Electronics Corporation
4 * Copyright (C) 2015 Renesas Solutions Corp.
5 * Copyright (C) 2015 Cogent Embedded, Inc. <source@cogentembedded.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
15 static int ravb_ptp_tcr_request(struct ravb_private *priv, u32 request)
17 struct net_device *ndev = priv->ndev;
20 error = ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
24 ravb_write(ndev, ravb_read(ndev, GCCR) | request, GCCR);
25 return ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
28 /* Caller must hold the lock */
29 static int ravb_ptp_time_read(struct ravb_private *priv, struct timespec64 *ts)
31 struct net_device *ndev = priv->ndev;
34 error = ravb_ptp_tcr_request(priv, GCCR_TCR_CAPTURE);
38 ts->tv_nsec = ravb_read(ndev, GCT0);
39 ts->tv_sec = ravb_read(ndev, GCT1) |
40 ((s64)ravb_read(ndev, GCT2) << 32);
45 /* Caller must hold the lock */
46 static int ravb_ptp_time_write(struct ravb_private *priv,
47 const struct timespec64 *ts)
49 struct net_device *ndev = priv->ndev;
53 error = ravb_ptp_tcr_request(priv, GCCR_TCR_RESET);
57 gccr = ravb_read(ndev, GCCR);
60 ravb_write(ndev, ts->tv_nsec, GTO0);
61 ravb_write(ndev, ts->tv_sec, GTO1);
62 ravb_write(ndev, (ts->tv_sec >> 32) & 0xffff, GTO2);
63 ravb_write(ndev, gccr | GCCR_LTO, GCCR);
68 /* Caller must hold the lock */
69 static int ravb_ptp_update_compare(struct ravb_private *priv, u32 ns)
71 struct net_device *ndev = priv->ndev;
72 /* When the comparison value (GPTC.PTCV) is in range of
73 * [x-1 to x+1] (x is the configured increment value in
74 * GTI.TIV), it may happen that a comparison match is
75 * not detected when the timer wraps around.
77 u32 gti_ns_plus_1 = (priv->ptp.current_addend >> 20) + 1;
80 if (ns < gti_ns_plus_1)
82 else if (ns > 0 - gti_ns_plus_1)
83 ns = 0 - gti_ns_plus_1;
85 gccr = ravb_read(ndev, GCCR);
88 ravb_write(ndev, ns, GPTC);
89 ravb_write(ndev, gccr | GCCR_LPTC, GCCR);
94 /* PTP clock operations */
95 static int ravb_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
97 struct ravb_private *priv = container_of(ptp, struct ravb_private,
99 struct net_device *ndev = priv->ndev;
102 bool neg_adj = false;
109 addend = priv->ptp.default_addend;
110 diff = div_u64((u64)addend * ppb, NSEC_PER_SEC);
112 addend = neg_adj ? addend - diff : addend + diff;
114 spin_lock_irqsave(&priv->lock, flags);
116 priv->ptp.current_addend = addend;
118 gccr = ravb_read(ndev, GCCR);
121 ravb_write(ndev, addend & GTI_TIV, GTI);
122 ravb_write(ndev, gccr | GCCR_LTI, GCCR);
124 spin_unlock_irqrestore(&priv->lock, flags);
129 static int ravb_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
131 struct ravb_private *priv = container_of(ptp, struct ravb_private,
133 struct timespec64 ts;
137 spin_lock_irqsave(&priv->lock, flags);
138 error = ravb_ptp_time_read(priv, &ts);
140 u64 now = ktime_to_ns(timespec64_to_ktime(ts));
142 ts = ns_to_timespec64(now + delta);
143 error = ravb_ptp_time_write(priv, &ts);
145 spin_unlock_irqrestore(&priv->lock, flags);
150 static int ravb_ptp_gettime64(struct ptp_clock_info *ptp, struct timespec64 *ts)
152 struct ravb_private *priv = container_of(ptp, struct ravb_private,
157 spin_lock_irqsave(&priv->lock, flags);
158 error = ravb_ptp_time_read(priv, ts);
159 spin_unlock_irqrestore(&priv->lock, flags);
164 static int ravb_ptp_settime64(struct ptp_clock_info *ptp,
165 const struct timespec64 *ts)
167 struct ravb_private *priv = container_of(ptp, struct ravb_private,
172 spin_lock_irqsave(&priv->lock, flags);
173 error = ravb_ptp_time_write(priv, ts);
174 spin_unlock_irqrestore(&priv->lock, flags);
179 static int ravb_ptp_extts(struct ptp_clock_info *ptp,
180 struct ptp_extts_request *req, int on)
182 struct ravb_private *priv = container_of(ptp, struct ravb_private,
184 struct net_device *ndev = priv->ndev;
191 if (priv->ptp.extts[req->index] == on)
193 priv->ptp.extts[req->index] = on;
195 spin_lock_irqsave(&priv->lock, flags);
196 gic = ravb_read(ndev, GIC);
201 ravb_write(ndev, gic, GIC);
203 spin_unlock_irqrestore(&priv->lock, flags);
208 static int ravb_ptp_perout(struct ptp_clock_info *ptp,
209 struct ptp_perout_request *req, int on)
211 struct ravb_private *priv = container_of(ptp, struct ravb_private,
213 struct net_device *ndev = priv->ndev;
214 struct ravb_ptp_perout *perout;
226 start_ns = req->start.sec * NSEC_PER_SEC + req->start.nsec;
227 period_ns = req->period.sec * NSEC_PER_SEC + req->period.nsec;
229 if (start_ns > U32_MAX) {
231 "ptp: start value (nsec) is over limit. Maximum size of start is only 32 bits\n");
235 if (period_ns > U32_MAX) {
237 "ptp: period value (nsec) is over limit. Maximum size of period is only 32 bits\n");
241 spin_lock_irqsave(&priv->lock, flags);
243 perout = &priv->ptp.perout[req->index];
244 perout->target = (u32)start_ns;
245 perout->period = (u32)period_ns;
246 error = ravb_ptp_update_compare(priv, (u32)start_ns);
248 /* Unmask interrupt */
249 gic = ravb_read(ndev, GIC);
251 ravb_write(ndev, gic, GIC);
254 spin_lock_irqsave(&priv->lock, flags);
256 perout = &priv->ptp.perout[req->index];
260 gic = ravb_read(ndev, GIC);
262 ravb_write(ndev, gic, GIC);
265 spin_unlock_irqrestore(&priv->lock, flags);
270 static int ravb_ptp_enable(struct ptp_clock_info *ptp,
271 struct ptp_clock_request *req, int on)
274 case PTP_CLK_REQ_EXTTS:
275 return ravb_ptp_extts(ptp, &req->extts, on);
276 case PTP_CLK_REQ_PEROUT:
277 return ravb_ptp_perout(ptp, &req->perout, on);
283 static const struct ptp_clock_info ravb_ptp_info = {
284 .owner = THIS_MODULE,
285 .name = "ravb clock",
287 .n_ext_ts = N_EXT_TS,
288 .n_per_out = N_PER_OUT,
289 .adjfreq = ravb_ptp_adjfreq,
290 .adjtime = ravb_ptp_adjtime,
291 .gettime64 = ravb_ptp_gettime64,
292 .settime64 = ravb_ptp_settime64,
293 .enable = ravb_ptp_enable,
296 /* Caller must hold the lock */
297 irqreturn_t ravb_ptp_interrupt(struct net_device *ndev)
299 struct ravb_private *priv = netdev_priv(ndev);
300 u32 gis = ravb_read(ndev, GIS);
302 gis &= ravb_read(ndev, GIC);
303 if (gis & GIS_PTCF) {
304 struct ptp_clock_event event;
306 event.type = PTP_CLOCK_EXTTS;
308 event.timestamp = ravb_read(ndev, GCPT);
309 ptp_clock_event(priv->ptp.clock, &event);
311 if (gis & GIS_PTMF) {
312 struct ravb_ptp_perout *perout = priv->ptp.perout;
314 if (perout->period) {
315 perout->target += perout->period;
316 ravb_ptp_update_compare(priv, perout->target);
321 ravb_write(ndev, ~gis, GIS);
328 void ravb_ptp_init(struct net_device *ndev, struct platform_device *pdev)
330 struct ravb_private *priv = netdev_priv(ndev);
334 priv->ptp.info = ravb_ptp_info;
336 priv->ptp.default_addend = ravb_read(ndev, GTI);
337 priv->ptp.current_addend = priv->ptp.default_addend;
339 spin_lock_irqsave(&priv->lock, flags);
340 ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
341 gccr = ravb_read(ndev, GCCR) & ~GCCR_TCSS;
342 ravb_write(ndev, gccr | GCCR_TCSS_ADJGPTP, GCCR);
344 spin_unlock_irqrestore(&priv->lock, flags);
346 priv->ptp.clock = ptp_clock_register(&priv->ptp.info, &pdev->dev);
349 void ravb_ptp_stop(struct net_device *ndev)
351 struct ravb_private *priv = netdev_priv(ndev);
353 ravb_write(ndev, 0, GIC);
354 ravb_write(ndev, 0, GIS);
356 ptp_clock_unregister(priv->ptp.clock);