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13#include "ravb.h"
14
15static int ravb_ptp_tcr_request(struct ravb_private *priv, u32 request)
16{
17 struct net_device *ndev = priv->ndev;
18 int error;
19
20 error = ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
21 if (error)
22 return error;
23
24 ravb_write(ndev, ravb_read(ndev, GCCR) | request, GCCR);
25 return ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
26}
27
28
29static int ravb_ptp_time_read(struct ravb_private *priv, struct timespec64 *ts)
30{
31 struct net_device *ndev = priv->ndev;
32 int error;
33
34 error = ravb_ptp_tcr_request(priv, GCCR_TCR_CAPTURE);
35 if (error)
36 return error;
37
38 ts->tv_nsec = ravb_read(ndev, GCT0);
39 ts->tv_sec = ravb_read(ndev, GCT1) |
40 ((s64)ravb_read(ndev, GCT2) << 32);
41
42 return 0;
43}
44
45
46static int ravb_ptp_time_write(struct ravb_private *priv,
47 const struct timespec64 *ts)
48{
49 struct net_device *ndev = priv->ndev;
50 int error;
51 u32 gccr;
52
53 error = ravb_ptp_tcr_request(priv, GCCR_TCR_RESET);
54 if (error)
55 return error;
56
57 gccr = ravb_read(ndev, GCCR);
58 if (gccr & GCCR_LTO)
59 return -EBUSY;
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);
64
65 return 0;
66}
67
68
69static int ravb_ptp_update_compare(struct ravb_private *priv, u32 ns)
70{
71 struct net_device *ndev = priv->ndev;
72
73
74
75
76
77 u32 gti_ns_plus_1 = (priv->ptp.current_addend >> 20) + 1;
78 u32 gccr;
79
80 if (ns < gti_ns_plus_1)
81 ns = gti_ns_plus_1;
82 else if (ns > 0 - gti_ns_plus_1)
83 ns = 0 - gti_ns_plus_1;
84
85 gccr = ravb_read(ndev, GCCR);
86 if (gccr & GCCR_LPTC)
87 return -EBUSY;
88 ravb_write(ndev, ns, GPTC);
89 ravb_write(ndev, gccr | GCCR_LPTC, GCCR);
90
91 return 0;
92}
93
94
95static int ravb_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
96{
97 struct ravb_private *priv = container_of(ptp, struct ravb_private,
98 ptp.info);
99 struct net_device *ndev = priv->ndev;
100 unsigned long flags;
101 u32 diff, addend;
102 bool neg_adj = false;
103 u32 gccr;
104
105 if (ppb < 0) {
106 neg_adj = true;
107 ppb = -ppb;
108 }
109 addend = priv->ptp.default_addend;
110 diff = div_u64((u64)addend * ppb, NSEC_PER_SEC);
111
112 addend = neg_adj ? addend - diff : addend + diff;
113
114 spin_lock_irqsave(&priv->lock, flags);
115
116 priv->ptp.current_addend = addend;
117
118 gccr = ravb_read(ndev, GCCR);
119 if (gccr & GCCR_LTI) {
120 spin_unlock_irqrestore(&priv->lock, flags);
121 return -EBUSY;
122 }
123 ravb_write(ndev, addend & GTI_TIV, GTI);
124 ravb_write(ndev, gccr | GCCR_LTI, GCCR);
125
126 spin_unlock_irqrestore(&priv->lock, flags);
127
128 return 0;
129}
130
131static int ravb_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
132{
133 struct ravb_private *priv = container_of(ptp, struct ravb_private,
134 ptp.info);
135 struct timespec64 ts;
136 unsigned long flags;
137 int error;
138
139 spin_lock_irqsave(&priv->lock, flags);
140 error = ravb_ptp_time_read(priv, &ts);
141 if (!error) {
142 u64 now = ktime_to_ns(timespec64_to_ktime(ts));
143
144 ts = ns_to_timespec64(now + delta);
145 error = ravb_ptp_time_write(priv, &ts);
146 }
147 spin_unlock_irqrestore(&priv->lock, flags);
148
149 return error;
150}
151
152static int ravb_ptp_gettime64(struct ptp_clock_info *ptp, struct timespec64 *ts)
153{
154 struct ravb_private *priv = container_of(ptp, struct ravb_private,
155 ptp.info);
156 unsigned long flags;
157 int error;
158
159 spin_lock_irqsave(&priv->lock, flags);
160 error = ravb_ptp_time_read(priv, ts);
161 spin_unlock_irqrestore(&priv->lock, flags);
162
163 return error;
164}
165
166static int ravb_ptp_settime64(struct ptp_clock_info *ptp,
167 const struct timespec64 *ts)
168{
169 struct ravb_private *priv = container_of(ptp, struct ravb_private,
170 ptp.info);
171 unsigned long flags;
172 int error;
173
174 spin_lock_irqsave(&priv->lock, flags);
175 error = ravb_ptp_time_write(priv, ts);
176 spin_unlock_irqrestore(&priv->lock, flags);
177
178 return error;
179}
180
181static int ravb_ptp_extts(struct ptp_clock_info *ptp,
182 struct ptp_extts_request *req, int on)
183{
184 struct ravb_private *priv = container_of(ptp, struct ravb_private,
185 ptp.info);
186 struct net_device *ndev = priv->ndev;
187 unsigned long flags;
188 u32 gic;
189
190 if (req->index)
191 return -EINVAL;
192
193 if (priv->ptp.extts[req->index] == on)
194 return 0;
195 priv->ptp.extts[req->index] = on;
196
197 spin_lock_irqsave(&priv->lock, flags);
198 gic = ravb_read(ndev, GIC);
199 if (on)
200 gic |= GIC_PTCE;
201 else
202 gic &= ~GIC_PTCE;
203 ravb_write(ndev, gic, GIC);
204 mmiowb();
205 spin_unlock_irqrestore(&priv->lock, flags);
206
207 return 0;
208}
209
210static int ravb_ptp_perout(struct ptp_clock_info *ptp,
211 struct ptp_perout_request *req, int on)
212{
213 struct ravb_private *priv = container_of(ptp, struct ravb_private,
214 ptp.info);
215 struct net_device *ndev = priv->ndev;
216 struct ravb_ptp_perout *perout;
217 unsigned long flags;
218 int error = 0;
219 u32 gic;
220
221 if (req->index)
222 return -EINVAL;
223
224 if (on) {
225 u64 start_ns;
226 u64 period_ns;
227
228 start_ns = req->start.sec * NSEC_PER_SEC + req->start.nsec;
229 period_ns = req->period.sec * NSEC_PER_SEC + req->period.nsec;
230
231 if (start_ns > U32_MAX) {
232 netdev_warn(ndev,
233 "ptp: start value (nsec) is over limit. Maximum size of start is only 32 bits\n");
234 return -ERANGE;
235 }
236
237 if (period_ns > U32_MAX) {
238 netdev_warn(ndev,
239 "ptp: period value (nsec) is over limit. Maximum size of period is only 32 bits\n");
240 return -ERANGE;
241 }
242
243 spin_lock_irqsave(&priv->lock, flags);
244
245 perout = &priv->ptp.perout[req->index];
246 perout->target = (u32)start_ns;
247 perout->period = (u32)period_ns;
248 error = ravb_ptp_update_compare(priv, (u32)start_ns);
249 if (!error) {
250
251 gic = ravb_read(ndev, GIC);
252 gic |= GIC_PTME;
253 ravb_write(ndev, gic, GIC);
254 }
255 } else {
256 spin_lock_irqsave(&priv->lock, flags);
257
258 perout = &priv->ptp.perout[req->index];
259 perout->period = 0;
260
261
262 gic = ravb_read(ndev, GIC);
263 gic &= ~GIC_PTME;
264 ravb_write(ndev, gic, GIC);
265 }
266 mmiowb();
267 spin_unlock_irqrestore(&priv->lock, flags);
268
269 return error;
270}
271
272static int ravb_ptp_enable(struct ptp_clock_info *ptp,
273 struct ptp_clock_request *req, int on)
274{
275 switch (req->type) {
276 case PTP_CLK_REQ_EXTTS:
277 return ravb_ptp_extts(ptp, &req->extts, on);
278 case PTP_CLK_REQ_PEROUT:
279 return ravb_ptp_perout(ptp, &req->perout, on);
280 default:
281 return -EOPNOTSUPP;
282 }
283}
284
285static const struct ptp_clock_info ravb_ptp_info = {
286 .owner = THIS_MODULE,
287 .name = "ravb clock",
288 .max_adj = 50000000,
289 .n_ext_ts = N_EXT_TS,
290 .n_per_out = N_PER_OUT,
291 .adjfreq = ravb_ptp_adjfreq,
292 .adjtime = ravb_ptp_adjtime,
293 .gettime64 = ravb_ptp_gettime64,
294 .settime64 = ravb_ptp_settime64,
295 .enable = ravb_ptp_enable,
296};
297
298
299irqreturn_t ravb_ptp_interrupt(struct net_device *ndev)
300{
301 struct ravb_private *priv = netdev_priv(ndev);
302 u32 gis = ravb_read(ndev, GIS);
303
304 gis &= ravb_read(ndev, GIC);
305 if (gis & GIS_PTCF) {
306 struct ptp_clock_event event;
307
308 event.type = PTP_CLOCK_EXTTS;
309 event.index = 0;
310 event.timestamp = ravb_read(ndev, GCPT);
311 ptp_clock_event(priv->ptp.clock, &event);
312 }
313 if (gis & GIS_PTMF) {
314 struct ravb_ptp_perout *perout = priv->ptp.perout;
315
316 if (perout->period) {
317 perout->target += perout->period;
318 ravb_ptp_update_compare(priv, perout->target);
319 }
320 }
321
322 if (gis) {
323 ravb_write(ndev, ~gis, GIS);
324 return IRQ_HANDLED;
325 }
326
327 return IRQ_NONE;
328}
329
330void ravb_ptp_init(struct net_device *ndev, struct platform_device *pdev)
331{
332 struct ravb_private *priv = netdev_priv(ndev);
333 unsigned long flags;
334 u32 gccr;
335
336 priv->ptp.info = ravb_ptp_info;
337
338 priv->ptp.default_addend = ravb_read(ndev, GTI);
339 priv->ptp.current_addend = priv->ptp.default_addend;
340
341 spin_lock_irqsave(&priv->lock, flags);
342 ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
343 gccr = ravb_read(ndev, GCCR) & ~GCCR_TCSS;
344 ravb_write(ndev, gccr | GCCR_TCSS_ADJGPTP, GCCR);
345 mmiowb();
346 spin_unlock_irqrestore(&priv->lock, flags);
347
348 priv->ptp.clock = ptp_clock_register(&priv->ptp.info, &pdev->dev);
349}
350
351void ravb_ptp_stop(struct net_device *ndev)
352{
353 struct ravb_private *priv = netdev_priv(ndev);
354
355 ravb_write(ndev, 0, GIC);
356 ravb_write(ndev, 0, GIS);
357
358 ptp_clock_unregister(priv->ptp.clock);
359}
360
