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20#include <linux/err.h>
21#include <linux/if.h>
22#include <linux/hrtimer.h>
23#include <linux/module.h>
24#include <linux/net_tstamp.h>
25#include <linux/ptp_classify.h>
26#include <linux/time.h>
27#include <linux/uaccess.h>
28#include <linux/workqueue.h>
29#include <linux/if_ether.h>
30#include <linux/if_vlan.h>
31
32#include "cpts.h"
33
34#ifdef CONFIG_TI_CPTS
35
36#define cpts_read32(c, r) __raw_readl(&c->reg->r)
37#define cpts_write32(c, v, r) __raw_writel(v, &c->reg->r)
38
39static int event_expired(struct cpts_event *event)
40{
41 return time_after(jiffies, event->tmo);
42}
43
44static int event_type(struct cpts_event *event)
45{
46 return (event->high >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK;
47}
48
49static int cpts_fifo_pop(struct cpts *cpts, u32 *high, u32 *low)
50{
51 u32 r = cpts_read32(cpts, intstat_raw);
52
53 if (r & TS_PEND_RAW) {
54 *high = cpts_read32(cpts, event_high);
55 *low = cpts_read32(cpts, event_low);
56 cpts_write32(cpts, EVENT_POP, event_pop);
57 return 0;
58 }
59 return -1;
60}
61
62
63
64
65static int cpts_fifo_read(struct cpts *cpts, int match)
66{
67 int i, type = -1;
68 u32 hi, lo;
69 struct cpts_event *event;
70
71 for (i = 0; i < CPTS_FIFO_DEPTH; i++) {
72 if (cpts_fifo_pop(cpts, &hi, &lo))
73 break;
74 if (list_empty(&cpts->pool)) {
75 pr_err("cpts: event pool is empty\n");
76 return -1;
77 }
78 event = list_first_entry(&cpts->pool, struct cpts_event, list);
79 event->tmo = jiffies + 2;
80 event->high = hi;
81 event->low = lo;
82 type = event_type(event);
83 switch (type) {
84 case CPTS_EV_PUSH:
85 case CPTS_EV_RX:
86 case CPTS_EV_TX:
87 list_del_init(&event->list);
88 list_add_tail(&event->list, &cpts->events);
89 break;
90 case CPTS_EV_ROLL:
91 case CPTS_EV_HALF:
92 case CPTS_EV_HW:
93 break;
94 default:
95 pr_err("cpts: unknown event type\n");
96 break;
97 }
98 if (type == match)
99 break;
100 }
101 return type == match ? 0 : -1;
102}
103
104static cycle_t cpts_systim_read(const struct cyclecounter *cc)
105{
106 u64 val = 0;
107 struct cpts_event *event;
108 struct list_head *this, *next;
109 struct cpts *cpts = container_of(cc, struct cpts, cc);
110
111 cpts_write32(cpts, TS_PUSH, ts_push);
112 if (cpts_fifo_read(cpts, CPTS_EV_PUSH))
113 pr_err("cpts: unable to obtain a time stamp\n");
114
115 list_for_each_safe(this, next, &cpts->events) {
116 event = list_entry(this, struct cpts_event, list);
117 if (event_type(event) == CPTS_EV_PUSH) {
118 list_del_init(&event->list);
119 list_add(&event->list, &cpts->pool);
120 val = event->low;
121 break;
122 }
123 }
124
125 return val;
126}
127
128
129
130static int cpts_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
131{
132 u64 adj;
133 u32 diff, mult;
134 int neg_adj = 0;
135 unsigned long flags;
136 struct cpts *cpts = container_of(ptp, struct cpts, info);
137
138 if (ppb < 0) {
139 neg_adj = 1;
140 ppb = -ppb;
141 }
142 mult = cpts->cc_mult;
143 adj = mult;
144 adj *= ppb;
145 diff = div_u64(adj, 1000000000ULL);
146
147 spin_lock_irqsave(&cpts->lock, flags);
148
149 timecounter_read(&cpts->tc);
150
151 cpts->cc.mult = neg_adj ? mult - diff : mult + diff;
152
153 spin_unlock_irqrestore(&cpts->lock, flags);
154
155 return 0;
156}
157
158static int cpts_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
159{
160 unsigned long flags;
161 struct cpts *cpts = container_of(ptp, struct cpts, info);
162
163 spin_lock_irqsave(&cpts->lock, flags);
164 timecounter_adjtime(&cpts->tc, delta);
165 spin_unlock_irqrestore(&cpts->lock, flags);
166
167 return 0;
168}
169
170static int cpts_ptp_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts)
171{
172 u64 ns;
173 unsigned long flags;
174 struct cpts *cpts = container_of(ptp, struct cpts, info);
175
176 spin_lock_irqsave(&cpts->lock, flags);
177 ns = timecounter_read(&cpts->tc);
178 spin_unlock_irqrestore(&cpts->lock, flags);
179
180 *ts = ns_to_timespec64(ns);
181
182 return 0;
183}
184
185static int cpts_ptp_settime(struct ptp_clock_info *ptp,
186 const struct timespec64 *ts)
187{
188 u64 ns;
189 unsigned long flags;
190 struct cpts *cpts = container_of(ptp, struct cpts, info);
191
192 ns = timespec64_to_ns(ts);
193
194 spin_lock_irqsave(&cpts->lock, flags);
195 timecounter_init(&cpts->tc, &cpts->cc, ns);
196 spin_unlock_irqrestore(&cpts->lock, flags);
197
198 return 0;
199}
200
201static int cpts_ptp_enable(struct ptp_clock_info *ptp,
202 struct ptp_clock_request *rq, int on)
203{
204 return -EOPNOTSUPP;
205}
206
207static struct ptp_clock_info cpts_info = {
208 .owner = THIS_MODULE,
209 .name = "CTPS timer",
210 .max_adj = 1000000,
211 .n_ext_ts = 0,
212 .n_pins = 0,
213 .pps = 0,
214 .adjfreq = cpts_ptp_adjfreq,
215 .adjtime = cpts_ptp_adjtime,
216 .gettime64 = cpts_ptp_gettime,
217 .settime64 = cpts_ptp_settime,
218 .enable = cpts_ptp_enable,
219};
220
221static void cpts_overflow_check(struct work_struct *work)
222{
223 struct timespec64 ts;
224 struct cpts *cpts = container_of(work, struct cpts, overflow_work.work);
225
226 cpts_write32(cpts, CPTS_EN, control);
227 cpts_write32(cpts, TS_PEND_EN, int_enable);
228 cpts_ptp_gettime(&cpts->info, &ts);
229 pr_debug("cpts overflow check at %lld.%09lu\n", ts.tv_sec, ts.tv_nsec);
230 schedule_delayed_work(&cpts->overflow_work, CPTS_OVERFLOW_PERIOD);
231}
232
233static void cpts_clk_init(struct device *dev, struct cpts *cpts)
234{
235 cpts->refclk = devm_clk_get(dev, "cpts");
236 if (IS_ERR(cpts->refclk)) {
237 dev_err(dev, "Failed to get cpts refclk\n");
238 cpts->refclk = NULL;
239 return;
240 }
241 clk_prepare_enable(cpts->refclk);
242}
243
244static void cpts_clk_release(struct cpts *cpts)
245{
246 clk_disable(cpts->refclk);
247}
248
249static int cpts_match(struct sk_buff *skb, unsigned int ptp_class,
250 u16 ts_seqid, u8 ts_msgtype)
251{
252 u16 *seqid;
253 unsigned int offset = 0;
254 u8 *msgtype, *data = skb->data;
255
256 if (ptp_class & PTP_CLASS_VLAN)
257 offset += VLAN_HLEN;
258
259 switch (ptp_class & PTP_CLASS_PMASK) {
260 case PTP_CLASS_IPV4:
261 offset += ETH_HLEN + IPV4_HLEN(data + offset) + UDP_HLEN;
262 break;
263 case PTP_CLASS_IPV6:
264 offset += ETH_HLEN + IP6_HLEN + UDP_HLEN;
265 break;
266 case PTP_CLASS_L2:
267 offset += ETH_HLEN;
268 break;
269 default:
270 return 0;
271 }
272
273 if (skb->len + ETH_HLEN < offset + OFF_PTP_SEQUENCE_ID + sizeof(*seqid))
274 return 0;
275
276 if (unlikely(ptp_class & PTP_CLASS_V1))
277 msgtype = data + offset + OFF_PTP_CONTROL;
278 else
279 msgtype = data + offset;
280
281 seqid = (u16 *)(data + offset + OFF_PTP_SEQUENCE_ID);
282
283 return (ts_msgtype == (*msgtype & 0xf) && ts_seqid == ntohs(*seqid));
284}
285
286static u64 cpts_find_ts(struct cpts *cpts, struct sk_buff *skb, int ev_type)
287{
288 u64 ns = 0;
289 struct cpts_event *event;
290 struct list_head *this, *next;
291 unsigned int class = ptp_classify_raw(skb);
292 unsigned long flags;
293 u16 seqid;
294 u8 mtype;
295
296 if (class == PTP_CLASS_NONE)
297 return 0;
298
299 spin_lock_irqsave(&cpts->lock, flags);
300 cpts_fifo_read(cpts, CPTS_EV_PUSH);
301 list_for_each_safe(this, next, &cpts->events) {
302 event = list_entry(this, struct cpts_event, list);
303 if (event_expired(event)) {
304 list_del_init(&event->list);
305 list_add(&event->list, &cpts->pool);
306 continue;
307 }
308 mtype = (event->high >> MESSAGE_TYPE_SHIFT) & MESSAGE_TYPE_MASK;
309 seqid = (event->high >> SEQUENCE_ID_SHIFT) & SEQUENCE_ID_MASK;
310 if (ev_type == event_type(event) &&
311 cpts_match(skb, class, seqid, mtype)) {
312 ns = timecounter_cyc2time(&cpts->tc, event->low);
313 list_del_init(&event->list);
314 list_add(&event->list, &cpts->pool);
315 break;
316 }
317 }
318 spin_unlock_irqrestore(&cpts->lock, flags);
319
320 return ns;
321}
322
323void cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb)
324{
325 u64 ns;
326 struct skb_shared_hwtstamps *ssh;
327
328 if (!cpts->rx_enable)
329 return;
330 ns = cpts_find_ts(cpts, skb, CPTS_EV_RX);
331 if (!ns)
332 return;
333 ssh = skb_hwtstamps(skb);
334 memset(ssh, 0, sizeof(*ssh));
335 ssh->hwtstamp = ns_to_ktime(ns);
336}
337
338void cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb)
339{
340 u64 ns;
341 struct skb_shared_hwtstamps ssh;
342
343 if (!(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS))
344 return;
345 ns = cpts_find_ts(cpts, skb, CPTS_EV_TX);
346 if (!ns)
347 return;
348 memset(&ssh, 0, sizeof(ssh));
349 ssh.hwtstamp = ns_to_ktime(ns);
350 skb_tstamp_tx(skb, &ssh);
351}
352
353#endif
354
355int cpts_register(struct device *dev, struct cpts *cpts,
356 u32 mult, u32 shift)
357{
358#ifdef CONFIG_TI_CPTS
359 int err, i;
360 unsigned long flags;
361
362 cpts->info = cpts_info;
363 cpts->clock = ptp_clock_register(&cpts->info, dev);
364 if (IS_ERR(cpts->clock)) {
365 err = PTR_ERR(cpts->clock);
366 cpts->clock = NULL;
367 return err;
368 }
369 spin_lock_init(&cpts->lock);
370
371 cpts->cc.read = cpts_systim_read;
372 cpts->cc.mask = CLOCKSOURCE_MASK(32);
373 cpts->cc_mult = mult;
374 cpts->cc.mult = mult;
375 cpts->cc.shift = shift;
376
377 INIT_LIST_HEAD(&cpts->events);
378 INIT_LIST_HEAD(&cpts->pool);
379 for (i = 0; i < CPTS_MAX_EVENTS; i++)
380 list_add(&cpts->pool_data[i].list, &cpts->pool);
381
382 cpts_clk_init(dev, cpts);
383 cpts_write32(cpts, CPTS_EN, control);
384 cpts_write32(cpts, TS_PEND_EN, int_enable);
385
386 spin_lock_irqsave(&cpts->lock, flags);
387 timecounter_init(&cpts->tc, &cpts->cc, ktime_to_ns(ktime_get_real()));
388 spin_unlock_irqrestore(&cpts->lock, flags);
389
390 INIT_DELAYED_WORK(&cpts->overflow_work, cpts_overflow_check);
391 schedule_delayed_work(&cpts->overflow_work, CPTS_OVERFLOW_PERIOD);
392
393 cpts->phc_index = ptp_clock_index(cpts->clock);
394#endif
395 return 0;
396}
397
398void cpts_unregister(struct cpts *cpts)
399{
400#ifdef CONFIG_TI_CPTS
401 if (cpts->clock) {
402 ptp_clock_unregister(cpts->clock);
403 cancel_delayed_work_sync(&cpts->overflow_work);
404 }
405 if (cpts->refclk)
406 cpts_clk_release(cpts);
407#endif
408}
409
