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Add linux-next specific files for 20110831
[linux-2.6/next.git] / drivers / net / phy / dp83640.c
blobcb6e0b486b1e220864ba72c60decf9f53b0a05c2
1 /*
2 * Driver for the National Semiconductor DP83640 PHYTER
3 *
4 * Copyright (C) 2010 OMICRON electronics GmbH
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20 #include <linux/ethtool.h>
21 #include <linux/kernel.h>
22 #include <linux/list.h>
23 #include <linux/mii.h>
24 #include <linux/module.h>
25 #include <linux/net_tstamp.h>
26 #include <linux/netdevice.h>
27 #include <linux/phy.h>
28 #include <linux/ptp_classify.h>
29 #include <linux/ptp_clock_kernel.h>
30
31 #include "dp83640_reg.h"
32
33 #define DP83640_PHY_ID 0x20005ce1
34 #define PAGESEL 0x13
35 #define LAYER4 0x02
36 #define LAYER2 0x01
37 #define MAX_RXTS 64
38 #define N_EXT_TS 1
39 #define PSF_PTPVER 2
40 #define PSF_EVNT 0x4000
41 #define PSF_RX 0x2000
42 #define PSF_TX 0x1000
43 #define EXT_EVENT 1
44 #define EXT_GPIO 1
45 #define CAL_EVENT 2
46 #define CAL_GPIO 9
47 #define CAL_TRIGGER 2
48
49 /* phyter seems to miss the mark by 16 ns */
50 #define ADJTIME_FIX 16
51
52 #if defined(__BIG_ENDIAN)
53 #define ENDIAN_FLAG 0
54 #elif defined(__LITTLE_ENDIAN)
55 #define ENDIAN_FLAG PSF_ENDIAN
56 #endif
57
58 #define SKB_PTP_TYPE(__skb) (*(unsigned int *)((__skb)->cb))
59
60 struct phy_rxts {
61 u16 ns_lo; /* ns[15:0] */
62 u16 ns_hi; /* overflow[1:0], ns[29:16] */
63 u16 sec_lo; /* sec[15:0] */
64 u16 sec_hi; /* sec[31:16] */
65 u16 seqid; /* sequenceId[15:0] */
66 u16 msgtype; /* messageType[3:0], hash[11:0] */
67 };
68
69 struct phy_txts {
70 u16 ns_lo; /* ns[15:0] */
71 u16 ns_hi; /* overflow[1:0], ns[29:16] */
72 u16 sec_lo; /* sec[15:0] */
73 u16 sec_hi; /* sec[31:16] */
74 };
75
76 struct rxts {
77 struct list_head list;
78 unsigned long tmo;
79 u64 ns;
80 u16 seqid;
81 u8 msgtype;
82 u16 hash;
83 };
84
85 struct dp83640_clock;
86
87 struct dp83640_private {
88 struct list_head list;
89 struct dp83640_clock *clock;
90 struct phy_device *phydev;
91 struct work_struct ts_work;
92 int hwts_tx_en;
93 int hwts_rx_en;
94 int layer;
95 int version;
96 /* remember state of cfg0 during calibration */
97 int cfg0;
98 /* remember the last event time stamp */
99 struct phy_txts edata;
100 /* list of rx timestamps */
101 struct list_head rxts;
102 struct list_head rxpool;
103 struct rxts rx_pool_data[MAX_RXTS];
104 /* protects above three fields from concurrent access */
105 spinlock_t rx_lock;
106 /* queues of incoming and outgoing packets */
107 struct sk_buff_head rx_queue;
108 struct sk_buff_head tx_queue;
109 };
110
111 struct dp83640_clock {
112 /* keeps the instance in the 'phyter_clocks' list */
113 struct list_head list;
114 /* we create one clock instance per MII bus */
115 struct mii_bus *bus;
116 /* protects extended registers from concurrent access */
117 struct mutex extreg_lock;
118 /* remembers which page was last selected */
119 int page;
120 /* our advertised capabilities */
121 struct ptp_clock_info caps;
122 /* protects the three fields below from concurrent access */
123 struct mutex clock_lock;
124 /* the one phyter from which we shall read */
125 struct dp83640_private *chosen;
126 /* list of the other attached phyters, not chosen */
127 struct list_head phylist;
128 /* reference to our PTP hardware clock */
129 struct ptp_clock *ptp_clock;
130 };
131
132 /* globals */
133
134 static int chosen_phy = -1;
135 static ushort cal_gpio = 4;
136
137 module_param(chosen_phy, int, 0444);
138 module_param(cal_gpio, ushort, 0444);
139
140 MODULE_PARM_DESC(chosen_phy, \
141 "The address of the PHY to use for the ancillary clock features");
142 MODULE_PARM_DESC(cal_gpio, \
143 "Which GPIO line to use for synchronizing multiple PHYs");
144
145 /* a list of clocks and a mutex to protect it */
146 static LIST_HEAD(phyter_clocks);
147 static DEFINE_MUTEX(phyter_clocks_lock);
148
149 static void rx_timestamp_work(struct work_struct *work);
150
151 /* extended register access functions */
152
153 #define BROADCAST_ADDR 31
154
155 static inline int broadcast_write(struct mii_bus *bus, u32 regnum, u16 val)
156 {
157 return mdiobus_write(bus, BROADCAST_ADDR, regnum, val);
158 }
159
160 /* Caller must hold extreg_lock. */
161 static int ext_read(struct phy_device *phydev, int page, u32 regnum)
162 {
163 struct dp83640_private *dp83640 = phydev->priv;
164 int val;
165
166 if (dp83640->clock->page != page) {
167 broadcast_write(phydev->bus, PAGESEL, page);
168 dp83640->clock->page = page;
169 }
170 val = phy_read(phydev, regnum);
171
172 return val;
173 }
174
175 /* Caller must hold extreg_lock. */
176 static void ext_write(int broadcast, struct phy_device *phydev,
177 int page, u32 regnum, u16 val)
178 {
179 struct dp83640_private *dp83640 = phydev->priv;
180
181 if (dp83640->clock->page != page) {
182 broadcast_write(phydev->bus, PAGESEL, page);
183 dp83640->clock->page = page;
184 }
185 if (broadcast)
186 broadcast_write(phydev->bus, regnum, val);
187 else
188 phy_write(phydev, regnum, val);
189 }
190
191 /* Caller must hold extreg_lock. */
192 static int tdr_write(int bc, struct phy_device *dev,
193 const struct timespec *ts, u16 cmd)
194 {
195 ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_nsec & 0xffff);/* ns[15:0] */
196 ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_nsec >> 16); /* ns[31:16] */
197 ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_sec & 0xffff); /* sec[15:0] */
198 ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_sec >> 16); /* sec[31:16]*/
199
200 ext_write(bc, dev, PAGE4, PTP_CTL, cmd);
201
202 return 0;
203 }
204
205 /* convert phy timestamps into driver timestamps */
206
207 static void phy2rxts(struct phy_rxts *p, struct rxts *rxts)
208 {
209 u32 sec;
210
211 sec = p->sec_lo;
212 sec |= p->sec_hi << 16;
213
214 rxts->ns = p->ns_lo;
215 rxts->ns |= (p->ns_hi & 0x3fff) << 16;
216 rxts->ns += ((u64)sec) * 1000000000ULL;
217 rxts->seqid = p->seqid;
218 rxts->msgtype = (p->msgtype >> 12) & 0xf;
219 rxts->hash = p->msgtype & 0x0fff;
220 rxts->tmo = jiffies + 2;
221 }
222
223 static u64 phy2txts(struct phy_txts *p)
224 {
225 u64 ns;
226 u32 sec;
227
228 sec = p->sec_lo;
229 sec |= p->sec_hi << 16;
230
231 ns = p->ns_lo;
232 ns |= (p->ns_hi & 0x3fff) << 16;
233 ns += ((u64)sec) * 1000000000ULL;
234
235 return ns;
236 }
237
238 /* ptp clock methods */
239
240 static int ptp_dp83640_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
241 {
242 struct dp83640_clock *clock =
243 container_of(ptp, struct dp83640_clock, caps);
244 struct phy_device *phydev = clock->chosen->phydev;
245 u64 rate;
246 int neg_adj = 0;
247 u16 hi, lo;
248
249 if (ppb < 0) {
250 neg_adj = 1;
251 ppb = -ppb;
252 }
253 rate = ppb;
254 rate <<= 26;
255 rate = div_u64(rate, 1953125);
256
257 hi = (rate >> 16) & PTP_RATE_HI_MASK;
258 if (neg_adj)
259 hi |= PTP_RATE_DIR;
260
261 lo = rate & 0xffff;
262
263 mutex_lock(&clock->extreg_lock);
264
265 ext_write(1, phydev, PAGE4, PTP_RATEH, hi);
266 ext_write(1, phydev, PAGE4, PTP_RATEL, lo);
267
268 mutex_unlock(&clock->extreg_lock);
269
270 return 0;
271 }
272
273 static int ptp_dp83640_adjtime(struct ptp_clock_info *ptp, s64 delta)
274 {
275 struct dp83640_clock *clock =
276 container_of(ptp, struct dp83640_clock, caps);
277 struct phy_device *phydev = clock->chosen->phydev;
278 struct timespec ts;
279 int err;
280
281 delta += ADJTIME_FIX;
282
283 ts = ns_to_timespec(delta);
284
285 mutex_lock(&clock->extreg_lock);
286
287 err = tdr_write(1, phydev, &ts, PTP_STEP_CLK);
288
289 mutex_unlock(&clock->extreg_lock);
290
291 return err;
292 }
293
294 static int ptp_dp83640_gettime(struct ptp_clock_info *ptp, struct timespec *ts)
295 {
296 struct dp83640_clock *clock =
297 container_of(ptp, struct dp83640_clock, caps);
298 struct phy_device *phydev = clock->chosen->phydev;
299 unsigned int val[4];
300
301 mutex_lock(&clock->extreg_lock);
302
303 ext_write(0, phydev, PAGE4, PTP_CTL, PTP_RD_CLK);
304
305 val[0] = ext_read(phydev, PAGE4, PTP_TDR); /* ns[15:0] */
306 val[1] = ext_read(phydev, PAGE4, PTP_TDR); /* ns[31:16] */
307 val[2] = ext_read(phydev, PAGE4, PTP_TDR); /* sec[15:0] */
308 val[3] = ext_read(phydev, PAGE4, PTP_TDR); /* sec[31:16] */
309
310 mutex_unlock(&clock->extreg_lock);
311
312 ts->tv_nsec = val[0] | (val[1] << 16);
313 ts->tv_sec = val[2] | (val[3] << 16);
314
315 return 0;
316 }
317
318 static int ptp_dp83640_settime(struct ptp_clock_info *ptp,
319 const struct timespec *ts)
320 {
321 struct dp83640_clock *clock =
322 container_of(ptp, struct dp83640_clock, caps);
323 struct phy_device *phydev = clock->chosen->phydev;
324 int err;
325
326 mutex_lock(&clock->extreg_lock);
327
328 err = tdr_write(1, phydev, ts, PTP_LOAD_CLK);
329
330 mutex_unlock(&clock->extreg_lock);
331
332 return err;
333 }
334
335 static int ptp_dp83640_enable(struct ptp_clock_info *ptp,
336 struct ptp_clock_request *rq, int on)
337 {
338 struct dp83640_clock *clock =
339 container_of(ptp, struct dp83640_clock, caps);
340 struct phy_device *phydev = clock->chosen->phydev;
341 u16 evnt;
342
343 switch (rq->type) {
344 case PTP_CLK_REQ_EXTTS:
345 if (rq->extts.index != 0)
346 return -EINVAL;
347 evnt = EVNT_WR | (EXT_EVENT & EVNT_SEL_MASK) << EVNT_SEL_SHIFT;
348 if (on) {
349 evnt |= (EXT_GPIO & EVNT_GPIO_MASK) << EVNT_GPIO_SHIFT;
350 evnt |= EVNT_RISE;
351 }
352 ext_write(0, phydev, PAGE5, PTP_EVNT, evnt);
353 return 0;
354 default:
355 break;
356 }
357
358 return -EOPNOTSUPP;
359 }
360
361 static u8 status_frame_dst[6] = { 0x01, 0x1B, 0x19, 0x00, 0x00, 0x00 };
362 static u8 status_frame_src[6] = { 0x08, 0x00, 0x17, 0x0B, 0x6B, 0x0F };
363
364 static void enable_status_frames(struct phy_device *phydev, bool on)
365 {
366 u16 cfg0 = 0, ver;
367
368 if (on)
369 cfg0 = PSF_EVNT_EN | PSF_RXTS_EN | PSF_TXTS_EN | ENDIAN_FLAG;
370
371 ver = (PSF_PTPVER & VERSIONPTP_MASK) << VERSIONPTP_SHIFT;
372
373 ext_write(0, phydev, PAGE5, PSF_CFG0, cfg0);
374 ext_write(0, phydev, PAGE6, PSF_CFG1, ver);
375
376 if (!phydev->attached_dev) {
377 pr_warning("dp83640: expected to find an attached netdevice\n");
378 return;
379 }
380
381 if (on) {
382 if (dev_mc_add(phydev->attached_dev, status_frame_dst))
383 pr_warning("dp83640: failed to add mc address\n");
384 } else {
385 if (dev_mc_del(phydev->attached_dev, status_frame_dst))
386 pr_warning("dp83640: failed to delete mc address\n");
387 }
388 }
389
390 static bool is_status_frame(struct sk_buff *skb, int type)
391 {
392 struct ethhdr *h = eth_hdr(skb);
393
394 if (PTP_CLASS_V2_L2 == type &&
395 !memcmp(h->h_source, status_frame_src, sizeof(status_frame_src)))
396 return true;
397 else
398 return false;
399 }
400
401 static int expired(struct rxts *rxts)
402 {
403 return time_after(jiffies, rxts->tmo);
404 }
405
406 /* Caller must hold rx_lock. */
407 static void prune_rx_ts(struct dp83640_private *dp83640)
408 {
409 struct list_head *this, *next;
410 struct rxts *rxts;
411
412 list_for_each_safe(this, next, &dp83640->rxts) {
413 rxts = list_entry(this, struct rxts, list);
414 if (expired(rxts)) {
415 list_del_init(&rxts->list);
416 list_add(&rxts->list, &dp83640->rxpool);
417 }
418 }
419 }
420
421 /* synchronize the phyters so they act as one clock */
422
423 static void enable_broadcast(struct phy_device *phydev, int init_page, int on)
424 {
425 int val;
426 phy_write(phydev, PAGESEL, 0);
427 val = phy_read(phydev, PHYCR2);
428 if (on)
429 val |= BC_WRITE;
430 else
431 val &= ~BC_WRITE;
432 phy_write(phydev, PHYCR2, val);
433 phy_write(phydev, PAGESEL, init_page);
434 }
435
436 static void recalibrate(struct dp83640_clock *clock)
437 {
438 s64 now, diff;
439 struct phy_txts event_ts;
440 struct timespec ts;
441 struct list_head *this;
442 struct dp83640_private *tmp;
443 struct phy_device *master = clock->chosen->phydev;
444 u16 cfg0, evnt, ptp_trig, trigger, val;
445
446 trigger = CAL_TRIGGER;
447
448 mutex_lock(&clock->extreg_lock);
449
450 /*
451 * enable broadcast, disable status frames, enable ptp clock
452 */
453 list_for_each(this, &clock->phylist) {
454 tmp = list_entry(this, struct dp83640_private, list);
455 enable_broadcast(tmp->phydev, clock->page, 1);
456 tmp->cfg0 = ext_read(tmp->phydev, PAGE5, PSF_CFG0);
457 ext_write(0, tmp->phydev, PAGE5, PSF_CFG0, 0);
458 ext_write(0, tmp->phydev, PAGE4, PTP_CTL, PTP_ENABLE);
459 }
460 enable_broadcast(master, clock->page, 1);
461 cfg0 = ext_read(master, PAGE5, PSF_CFG0);
462 ext_write(0, master, PAGE5, PSF_CFG0, 0);
463 ext_write(0, master, PAGE4, PTP_CTL, PTP_ENABLE);
464
465 /*
466 * enable an event timestamp
467 */
468 evnt = EVNT_WR | EVNT_RISE | EVNT_SINGLE;
469 evnt |= (CAL_EVENT & EVNT_SEL_MASK) << EVNT_SEL_SHIFT;
470 evnt |= (cal_gpio & EVNT_GPIO_MASK) << EVNT_GPIO_SHIFT;
471
472 list_for_each(this, &clock->phylist) {
473 tmp = list_entry(this, struct dp83640_private, list);
474 ext_write(0, tmp->phydev, PAGE5, PTP_EVNT, evnt);
475 }
476 ext_write(0, master, PAGE5, PTP_EVNT, evnt);
477
478 /*
479 * configure a trigger
480 */
481 ptp_trig = TRIG_WR | TRIG_IF_LATE | TRIG_PULSE;
482 ptp_trig |= (trigger & TRIG_CSEL_MASK) << TRIG_CSEL_SHIFT;
483 ptp_trig |= (cal_gpio & TRIG_GPIO_MASK) << TRIG_GPIO_SHIFT;
484 ext_write(0, master, PAGE5, PTP_TRIG, ptp_trig);
485
486 /* load trigger */
487 val = (trigger & TRIG_SEL_MASK) << TRIG_SEL_SHIFT;
488 val |= TRIG_LOAD;
489 ext_write(0, master, PAGE4, PTP_CTL, val);
490
491 /* enable trigger */
492 val &= ~TRIG_LOAD;
493 val |= TRIG_EN;
494 ext_write(0, master, PAGE4, PTP_CTL, val);
495
496 /* disable trigger */
497 val = (trigger & TRIG_SEL_MASK) << TRIG_SEL_SHIFT;
498 val |= TRIG_DIS;
499 ext_write(0, master, PAGE4, PTP_CTL, val);
500
501 /*
502 * read out and correct offsets
503 */
504 val = ext_read(master, PAGE4, PTP_STS);
505 pr_info("master PTP_STS 0x%04hx", val);
506 val = ext_read(master, PAGE4, PTP_ESTS);
507 pr_info("master PTP_ESTS 0x%04hx", val);
508 event_ts.ns_lo = ext_read(master, PAGE4, PTP_EDATA);
509 event_ts.ns_hi = ext_read(master, PAGE4, PTP_EDATA);
510 event_ts.sec_lo = ext_read(master, PAGE4, PTP_EDATA);
511 event_ts.sec_hi = ext_read(master, PAGE4, PTP_EDATA);
512 now = phy2txts(&event_ts);
513
514 list_for_each(this, &clock->phylist) {
515 tmp = list_entry(this, struct dp83640_private, list);
516 val = ext_read(tmp->phydev, PAGE4, PTP_STS);
517 pr_info("slave PTP_STS 0x%04hx", val);
518 val = ext_read(tmp->phydev, PAGE4, PTP_ESTS);
519 pr_info("slave PTP_ESTS 0x%04hx", val);
520 event_ts.ns_lo = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
521 event_ts.ns_hi = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
522 event_ts.sec_lo = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
523 event_ts.sec_hi = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
524 diff = now - (s64) phy2txts(&event_ts);
525 pr_info("slave offset %lld nanoseconds\n", diff);
526 diff += ADJTIME_FIX;
527 ts = ns_to_timespec(diff);
528 tdr_write(0, tmp->phydev, &ts, PTP_STEP_CLK);
529 }
530
531 /*
532 * restore status frames
533 */
534 list_for_each(this, &clock->phylist) {
535 tmp = list_entry(this, struct dp83640_private, list);
536 ext_write(0, tmp->phydev, PAGE5, PSF_CFG0, tmp->cfg0);
537 }
538 ext_write(0, master, PAGE5, PSF_CFG0, cfg0);
539
540 mutex_unlock(&clock->extreg_lock);
541 }
542
543 /* time stamping methods */
544
545 static int decode_evnt(struct dp83640_private *dp83640,
546 void *data, u16 ests)
547 {
548 struct phy_txts *phy_txts;
549 struct ptp_clock_event event;
550 int words = (ests >> EVNT_TS_LEN_SHIFT) & EVNT_TS_LEN_MASK;
551 u16 ext_status = 0;
552
553 if (ests & MULT_EVNT) {
554 ext_status = *(u16 *) data;
555 data += sizeof(ext_status);
556 }
557
558 phy_txts = data;
559
560 switch (words) { /* fall through in every case */
561 case 3:
562 dp83640->edata.sec_hi = phy_txts->sec_hi;
563 case 2:
564 dp83640->edata.sec_lo = phy_txts->sec_lo;
565 case 1:
566 dp83640->edata.ns_hi = phy_txts->ns_hi;
567 case 0:
568 dp83640->edata.ns_lo = phy_txts->ns_lo;
569 }
570
571 event.type = PTP_CLOCK_EXTTS;
572 event.index = 0;
573 event.timestamp = phy2txts(&dp83640->edata);
574
575 ptp_clock_event(dp83640->clock->ptp_clock, &event);
576
577 words = ext_status ? words + 2 : words + 1;
578 return words * sizeof(u16);
579 }
580
581 static void decode_rxts(struct dp83640_private *dp83640,
582 struct phy_rxts *phy_rxts)
583 {
584 struct rxts *rxts;
585 unsigned long flags;
586
587 spin_lock_irqsave(&dp83640->rx_lock, flags);
588
589 prune_rx_ts(dp83640);
590
591 if (list_empty(&dp83640->rxpool)) {
592 pr_warning("dp83640: rx timestamp pool is empty\n");
593 goto out;
594 }
595 rxts = list_first_entry(&dp83640->rxpool, struct rxts, list);
596 list_del_init(&rxts->list);
597 phy2rxts(phy_rxts, rxts);
598 list_add_tail(&rxts->list, &dp83640->rxts);
599 out:
600 spin_unlock_irqrestore(&dp83640->rx_lock, flags);
601 }
602
603 static void decode_txts(struct dp83640_private *dp83640,
604 struct phy_txts *phy_txts)
605 {
606 struct skb_shared_hwtstamps shhwtstamps;
607 struct sk_buff *skb;
608 u64 ns;
609
610 /* We must already have the skb that triggered this. */
611
612 skb = skb_dequeue(&dp83640->tx_queue);
613
614 if (!skb) {
615 pr_warning("dp83640: have timestamp but tx_queue empty\n");
616 return;
617 }
618 ns = phy2txts(phy_txts);
619 memset(&shhwtstamps, 0, sizeof(shhwtstamps));
620 shhwtstamps.hwtstamp = ns_to_ktime(ns);
621 skb_complete_tx_timestamp(skb, &shhwtstamps);
622 }
623
624 static void decode_status_frame(struct dp83640_private *dp83640,
625 struct sk_buff *skb)
626 {
627 struct phy_rxts *phy_rxts;
628 struct phy_txts *phy_txts;
629 u8 *ptr;
630 int len, size;
631 u16 ests, type;
632
633 ptr = skb->data + 2;
634
635 for (len = skb_headlen(skb) - 2; len > sizeof(type); len -= size) {
636
637 type = *(u16 *)ptr;
638 ests = type & 0x0fff;
639 type = type & 0xf000;
640 len -= sizeof(type);
641 ptr += sizeof(type);
642
643 if (PSF_RX == type && len >= sizeof(*phy_rxts)) {
644
645 phy_rxts = (struct phy_rxts *) ptr;
646 decode_rxts(dp83640, phy_rxts);
647 size = sizeof(*phy_rxts);
648
649 } else if (PSF_TX == type && len >= sizeof(*phy_txts)) {
650
651 phy_txts = (struct phy_txts *) ptr;
652 decode_txts(dp83640, phy_txts);
653 size = sizeof(*phy_txts);
654
655 } else if (PSF_EVNT == type && len >= sizeof(*phy_txts)) {
656
657 size = decode_evnt(dp83640, ptr, ests);
658
659 } else {
660 size = 0;
661 break;
662 }
663 ptr += size;
664 }
665 }
666
667 static int match(struct sk_buff *skb, unsigned int type, struct rxts *rxts)
668 {
669 u16 *seqid;
670 unsigned int offset;
671 u8 *msgtype, *data = skb_mac_header(skb);
672
673 /* check sequenceID, messageType, 12 bit hash of offset 20-29 */
674
675 switch (type) {
676 case PTP_CLASS_V1_IPV4:
677 case PTP_CLASS_V2_IPV4:
678 offset = ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
679 break;
680 case PTP_CLASS_V1_IPV6:
681 case PTP_CLASS_V2_IPV6:
682 offset = OFF_PTP6;
683 break;
684 case PTP_CLASS_V2_L2:
685 offset = ETH_HLEN;
686 break;
687 case PTP_CLASS_V2_VLAN:
688 offset = ETH_HLEN + VLAN_HLEN;
689 break;
690 default:
691 return 0;
692 }
693
694 if (skb->len + ETH_HLEN < offset + OFF_PTP_SEQUENCE_ID + sizeof(*seqid))
695 return 0;
696
697 if (unlikely(type & PTP_CLASS_V1))
698 msgtype = data + offset + OFF_PTP_CONTROL;
699 else
700 msgtype = data + offset;
701
702 seqid = (u16 *)(data + offset + OFF_PTP_SEQUENCE_ID);
703
704 return (rxts->msgtype == (*msgtype & 0xf) &&
705 rxts->seqid == ntohs(*seqid));
706 }
707
708 static void dp83640_free_clocks(void)
709 {
710 struct dp83640_clock *clock;
711 struct list_head *this, *next;
712
713 mutex_lock(&phyter_clocks_lock);
714
715 list_for_each_safe(this, next, &phyter_clocks) {
716 clock = list_entry(this, struct dp83640_clock, list);
717 if (!list_empty(&clock->phylist)) {
718 pr_warning("phy list non-empty while unloading");
719 BUG();
720 }
721 list_del(&clock->list);
722 mutex_destroy(&clock->extreg_lock);
723 mutex_destroy(&clock->clock_lock);
724 put_device(&clock->bus->dev);
725 kfree(clock);
726 }
727
728 mutex_unlock(&phyter_clocks_lock);
729 }
730
731 static void dp83640_clock_init(struct dp83640_clock *clock, struct mii_bus *bus)
732 {
733 INIT_LIST_HEAD(&clock->list);
734 clock->bus = bus;
735 mutex_init(&clock->extreg_lock);
736 mutex_init(&clock->clock_lock);
737 INIT_LIST_HEAD(&clock->phylist);
738 clock->caps.owner = THIS_MODULE;
739 sprintf(clock->caps.name, "dp83640 timer");
740 clock->caps.max_adj = 1953124;
741 clock->caps.n_alarm = 0;
742 clock->caps.n_ext_ts = N_EXT_TS;
743 clock->caps.n_per_out = 0;
744 clock->caps.pps = 0;
745 clock->caps.adjfreq = ptp_dp83640_adjfreq;
746 clock->caps.adjtime = ptp_dp83640_adjtime;
747 clock->caps.gettime = ptp_dp83640_gettime;
748 clock->caps.settime = ptp_dp83640_settime;
749 clock->caps.enable = ptp_dp83640_enable;
750 /*
751 * Get a reference to this bus instance.
752 */
753 get_device(&bus->dev);
754 }
755
756 static int choose_this_phy(struct dp83640_clock *clock,
757 struct phy_device *phydev)
758 {
759 if (chosen_phy == -1 && !clock->chosen)
760 return 1;
761
762 if (chosen_phy == phydev->addr)
763 return 1;
764
765 return 0;
766 }
767
768 static struct dp83640_clock *dp83640_clock_get(struct dp83640_clock *clock)
769 {
770 if (clock)
771 mutex_lock(&clock->clock_lock);
772 return clock;
773 }
774
775 /*
776 * Look up and lock a clock by bus instance.
777 * If there is no clock for this bus, then create it first.
778 */
779 static struct dp83640_clock *dp83640_clock_get_bus(struct mii_bus *bus)
780 {
781 struct dp83640_clock *clock = NULL, *tmp;
782 struct list_head *this;
783
784 mutex_lock(&phyter_clocks_lock);
785
786 list_for_each(this, &phyter_clocks) {
787 tmp = list_entry(this, struct dp83640_clock, list);
788 if (tmp->bus == bus) {
789 clock = tmp;
790 break;
791 }
792 }
793 if (clock)
794 goto out;
795
796 clock = kzalloc(sizeof(struct dp83640_clock), GFP_KERNEL);
797 if (!clock)
798 goto out;
799
800 dp83640_clock_init(clock, bus);
801 list_add_tail(&phyter_clocks, &clock->list);
802 out:
803 mutex_unlock(&phyter_clocks_lock);
804
805 return dp83640_clock_get(clock);
806 }
807
808 static void dp83640_clock_put(struct dp83640_clock *clock)
809 {
810 mutex_unlock(&clock->clock_lock);
811 }
812
813 static int dp83640_probe(struct phy_device *phydev)
814 {
815 struct dp83640_clock *clock;
816 struct dp83640_private *dp83640;
817 int err = -ENOMEM, i;
818
819 if (phydev->addr == BROADCAST_ADDR)
820 return 0;
821
822 clock = dp83640_clock_get_bus(phydev->bus);
823 if (!clock)
824 goto no_clock;
825
826 dp83640 = kzalloc(sizeof(struct dp83640_private), GFP_KERNEL);
827 if (!dp83640)
828 goto no_memory;
829
830 dp83640->phydev = phydev;
831 INIT_WORK(&dp83640->ts_work, rx_timestamp_work);
832
833 INIT_LIST_HEAD(&dp83640->rxts);
834 INIT_LIST_HEAD(&dp83640->rxpool);
835 for (i = 0; i < MAX_RXTS; i++)
836 list_add(&dp83640->rx_pool_data[i].list, &dp83640->rxpool);
837
838 phydev->priv = dp83640;
839
840 spin_lock_init(&dp83640->rx_lock);
841 skb_queue_head_init(&dp83640->rx_queue);
842 skb_queue_head_init(&dp83640->tx_queue);
843
844 dp83640->clock = clock;
845
846 if (choose_this_phy(clock, phydev)) {
847 clock->chosen = dp83640;
848 clock->ptp_clock = ptp_clock_register(&clock->caps);
849 if (IS_ERR(clock->ptp_clock)) {
850 err = PTR_ERR(clock->ptp_clock);
851 goto no_register;
852 }
853 } else
854 list_add_tail(&dp83640->list, &clock->phylist);
855
856 if (clock->chosen && !list_empty(&clock->phylist))
857 recalibrate(clock);
858 else
859 enable_broadcast(dp83640->phydev, clock->page, 1);
860
861 dp83640_clock_put(clock);
862 return 0;
863
864 no_register:
865 clock->chosen = NULL;
866 kfree(dp83640);
867 no_memory:
868 dp83640_clock_put(clock);
869 no_clock:
870 return err;
871 }
872
873 static void dp83640_remove(struct phy_device *phydev)
874 {
875 struct dp83640_clock *clock;
876 struct list_head *this, *next;
877 struct dp83640_private *tmp, *dp83640 = phydev->priv;
878
879 if (phydev->addr == BROADCAST_ADDR)
880 return;
881
882 enable_status_frames(phydev, false);
883 cancel_work_sync(&dp83640->ts_work);
884
885 clock = dp83640_clock_get(dp83640->clock);
886
887 if (dp83640 == clock->chosen) {
888 ptp_clock_unregister(clock->ptp_clock);
889 clock->chosen = NULL;
890 } else {
891 list_for_each_safe(this, next, &clock->phylist) {
892 tmp = list_entry(this, struct dp83640_private, list);
893 if (tmp == dp83640) {
894 list_del_init(&tmp->list);
895 break;
896 }
897 }
898 }
899
900 dp83640_clock_put(clock);
901 kfree(dp83640);
902 }
903
904 static int dp83640_hwtstamp(struct phy_device *phydev, struct ifreq *ifr)
905 {
906 struct dp83640_private *dp83640 = phydev->priv;
907 struct hwtstamp_config cfg;
908 u16 txcfg0, rxcfg0;
909
910 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
911 return -EFAULT;
912
913 if (cfg.flags) /* reserved for future extensions */
914 return -EINVAL;
915
916 switch (cfg.tx_type) {
917 case HWTSTAMP_TX_OFF:
918 dp83640->hwts_tx_en = 0;
919 break;
920 case HWTSTAMP_TX_ON:
921 dp83640->hwts_tx_en = 1;
922 break;
923 default:
924 return -ERANGE;
925 }
926
927 switch (cfg.rx_filter) {
928 case HWTSTAMP_FILTER_NONE:
929 dp83640->hwts_rx_en = 0;
930 dp83640->layer = 0;
931 dp83640->version = 0;
932 break;
933 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
934 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
935 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
936 dp83640->hwts_rx_en = 1;
937 dp83640->layer = LAYER4;
938 dp83640->version = 1;
939 break;
940 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
941 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
942 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
943 dp83640->hwts_rx_en = 1;
944 dp83640->layer = LAYER4;
945 dp83640->version = 2;
946 break;
947 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
948 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
949 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
950 dp83640->hwts_rx_en = 1;
951 dp83640->layer = LAYER2;
952 dp83640->version = 2;
953 break;
954 case HWTSTAMP_FILTER_PTP_V2_EVENT:
955 case HWTSTAMP_FILTER_PTP_V2_SYNC:
956 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
957 dp83640->hwts_rx_en = 1;
958 dp83640->layer = LAYER4|LAYER2;
959 dp83640->version = 2;
960 break;
961 default:
962 return -ERANGE;
963 }
964
965 txcfg0 = (dp83640->version & TX_PTP_VER_MASK) << TX_PTP_VER_SHIFT;
966 rxcfg0 = (dp83640->version & TX_PTP_VER_MASK) << TX_PTP_VER_SHIFT;
967
968 if (dp83640->layer & LAYER2) {
969 txcfg0 |= TX_L2_EN;
970 rxcfg0 |= RX_L2_EN;
971 }
972 if (dp83640->layer & LAYER4) {
973 txcfg0 |= TX_IPV6_EN | TX_IPV4_EN;
974 rxcfg0 |= RX_IPV6_EN | RX_IPV4_EN;
975 }
976
977 if (dp83640->hwts_tx_en)
978 txcfg0 |= TX_TS_EN;
979
980 if (dp83640->hwts_rx_en)
981 rxcfg0 |= RX_TS_EN;
982
983 mutex_lock(&dp83640->clock->extreg_lock);
984
985 if (dp83640->hwts_tx_en || dp83640->hwts_rx_en) {
986 enable_status_frames(phydev, true);
987 ext_write(0, phydev, PAGE4, PTP_CTL, PTP_ENABLE);
988 }
989
990 ext_write(0, phydev, PAGE5, PTP_TXCFG0, txcfg0);
991 ext_write(0, phydev, PAGE5, PTP_RXCFG0, rxcfg0);
992
993 mutex_unlock(&dp83640->clock->extreg_lock);
994
995 return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? -EFAULT : 0;
996 }
997
998 static void rx_timestamp_work(struct work_struct *work)
999 {
1000 struct dp83640_private *dp83640 =
1001 container_of(work, struct dp83640_private, ts_work);
1002 struct list_head *this, *next;
1003 struct rxts *rxts;
1004 struct skb_shared_hwtstamps *shhwtstamps;
1005 struct sk_buff *skb;
1006 unsigned int type;
1007 unsigned long flags;
1008
1009 /* Deliver each deferred packet, with or without a time stamp. */
1010
1011 while ((skb = skb_dequeue(&dp83640->rx_queue)) != NULL) {
1012 type = SKB_PTP_TYPE(skb);
1013 spin_lock_irqsave(&dp83640->rx_lock, flags);
1014 list_for_each_safe(this, next, &dp83640->rxts) {
1015 rxts = list_entry(this, struct rxts, list);
1016 if (match(skb, type, rxts)) {
1017 shhwtstamps = skb_hwtstamps(skb);
1018 memset(shhwtstamps, 0, sizeof(*shhwtstamps));
1019 shhwtstamps->hwtstamp = ns_to_ktime(rxts->ns);
1020 list_del_init(&rxts->list);
1021 list_add(&rxts->list, &dp83640->rxpool);
1022 break;
1023 }
1024 }
1025 spin_unlock_irqrestore(&dp83640->rx_lock, flags);
1026 netif_rx(skb);
1027 }
1028
1029 /* Clear out expired time stamps. */
1030
1031 spin_lock_irqsave(&dp83640->rx_lock, flags);
1032 prune_rx_ts(dp83640);
1033 spin_unlock_irqrestore(&dp83640->rx_lock, flags);
1034 }
1035
1036 static bool dp83640_rxtstamp(struct phy_device *phydev,
1037 struct sk_buff *skb, int type)
1038 {
1039 struct dp83640_private *dp83640 = phydev->priv;
1040
1041 if (!dp83640->hwts_rx_en)
1042 return false;
1043
1044 if (is_status_frame(skb, type)) {
1045 decode_status_frame(dp83640, skb);
1046 kfree_skb(skb);
1047 return true;
1048 }
1049
1050 SKB_PTP_TYPE(skb) = type;
1051 skb_queue_tail(&dp83640->rx_queue, skb);
1052 schedule_work(&dp83640->ts_work);
1053
1054 return true;
1055 }
1056
1057 static void dp83640_txtstamp(struct phy_device *phydev,
1058 struct sk_buff *skb, int type)
1059 {
1060 struct dp83640_private *dp83640 = phydev->priv;
1061
1062 if (!dp83640->hwts_tx_en) {
1063 kfree_skb(skb);
1064 return;
1065 }
1066 skb_queue_tail(&dp83640->tx_queue, skb);
1067 schedule_work(&dp83640->ts_work);
1068 }
1069
1070 static struct phy_driver dp83640_driver = {
1071 .phy_id = DP83640_PHY_ID,
1072 .phy_id_mask = 0xfffffff0,
1073 .name = "NatSemi DP83640",
1074 .features = PHY_BASIC_FEATURES,
1075 .flags = 0,
1076 .probe = dp83640_probe,
1077 .remove = dp83640_remove,
1078 .config_aneg = genphy_config_aneg,
1079 .read_status = genphy_read_status,
1080 .hwtstamp = dp83640_hwtstamp,
1081 .rxtstamp = dp83640_rxtstamp,
1082 .txtstamp = dp83640_txtstamp,
1083 .driver = {.owner = THIS_MODULE,}
1084 };
1085
1086 static int __init dp83640_init(void)
1087 {
1088 return phy_driver_register(&dp83640_driver);
1089 }
1090
1091 static void __exit dp83640_exit(void)
1092 {
1093 dp83640_free_clocks();
1094 phy_driver_unregister(&dp83640_driver);
1095 }
1096
1097 MODULE_DESCRIPTION("National Semiconductor DP83640 PHY driver");
1098 MODULE_AUTHOR("Richard Cochran <richard.cochran@omicron.at>");
1099 MODULE_LICENSE("GPL");
1100
1101 module_init(dp83640_init);
1102 module_exit(dp83640_exit);
1103
1104 static struct mdio_device_id __maybe_unused dp83640_tbl[] = {
1105 { DP83640_PHY_ID, 0xfffffff0 },
1106 { }
1107 };
1108
1109 MODULE_DEVICE_TABLE(mdio, dp83640_tbl);
linux-next