?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / net / phy / dp83640.c
blobba3c59147aa7eecda0e6cf1ff344caa498eb91fd
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 6
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 CAL_EVENT 7
45 #define CAL_TRIGGER 7
46 #define PER_TRIGGER 6
47
48 /* phyter seems to miss the mark by 16 ns */
49 #define ADJTIME_FIX 16
50
51 #if defined(__BIG_ENDIAN)
52 #define ENDIAN_FLAG 0
53 #elif defined(__LITTLE_ENDIAN)
54 #define ENDIAN_FLAG PSF_ENDIAN
55 #endif
56
57 #define SKB_PTP_TYPE(__skb) (*(unsigned int *)((__skb)->cb))
58
59 struct phy_rxts {
60 u16 ns_lo; /* ns[15:0] */
61 u16 ns_hi; /* overflow[1:0], ns[29:16] */
62 u16 sec_lo; /* sec[15:0] */
63 u16 sec_hi; /* sec[31:16] */
64 u16 seqid; /* sequenceId[15:0] */
65 u16 msgtype; /* messageType[3:0], hash[11:0] */
66 };
67
68 struct phy_txts {
69 u16 ns_lo; /* ns[15:0] */
70 u16 ns_hi; /* overflow[1:0], ns[29:16] */
71 u16 sec_lo; /* sec[15:0] */
72 u16 sec_hi; /* sec[31:16] */
73 };
74
75 struct rxts {
76 struct list_head list;
77 unsigned long tmo;
78 u64 ns;
79 u16 seqid;
80 u8 msgtype;
81 u16 hash;
82 };
83
84 struct dp83640_clock;
85
86 struct dp83640_private {
87 struct list_head list;
88 struct dp83640_clock *clock;
89 struct phy_device *phydev;
90 struct work_struct ts_work;
91 int hwts_tx_en;
92 int hwts_rx_en;
93 int layer;
94 int version;
95 /* remember state of cfg0 during calibration */
96 int cfg0;
97 /* remember the last event time stamp */
98 struct phy_txts edata;
99 /* list of rx timestamps */
100 struct list_head rxts;
101 struct list_head rxpool;
102 struct rxts rx_pool_data[MAX_RXTS];
103 /* protects above three fields from concurrent access */
104 spinlock_t rx_lock;
105 /* queues of incoming and outgoing packets */
106 struct sk_buff_head rx_queue;
107 struct sk_buff_head tx_queue;
108 };
109
110 struct dp83640_clock {
111 /* keeps the instance in the 'phyter_clocks' list */
112 struct list_head list;
113 /* we create one clock instance per MII bus */
114 struct mii_bus *bus;
115 /* protects extended registers from concurrent access */
116 struct mutex extreg_lock;
117 /* remembers which page was last selected */
118 int page;
119 /* our advertised capabilities */
120 struct ptp_clock_info caps;
121 /* protects the three fields below from concurrent access */
122 struct mutex clock_lock;
123 /* the one phyter from which we shall read */
124 struct dp83640_private *chosen;
125 /* list of the other attached phyters, not chosen */
126 struct list_head phylist;
127 /* reference to our PTP hardware clock */
128 struct ptp_clock *ptp_clock;
129 };
130
131 /* globals */
132
133 enum {
134 CALIBRATE_GPIO,
135 PEROUT_GPIO,
136 EXTTS0_GPIO,
137 EXTTS1_GPIO,
138 EXTTS2_GPIO,
139 EXTTS3_GPIO,
140 EXTTS4_GPIO,
141 EXTTS5_GPIO,
142 GPIO_TABLE_SIZE
143 };
144
145 static int chosen_phy = -1;
146 static ushort gpio_tab[GPIO_TABLE_SIZE] = {
147 1, 2, 3, 4, 8, 9, 10, 11
148 };
149
150 module_param(chosen_phy, int, 0444);
151 module_param_array(gpio_tab, ushort, NULL, 0444);
152
153 MODULE_PARM_DESC(chosen_phy, \
154 "The address of the PHY to use for the ancillary clock features");
155 MODULE_PARM_DESC(gpio_tab, \
156 "Which GPIO line to use for which purpose: cal,perout,extts1,...,extts6");
157
158 /* a list of clocks and a mutex to protect it */
159 static LIST_HEAD(phyter_clocks);
160 static DEFINE_MUTEX(phyter_clocks_lock);
161
162 static void rx_timestamp_work(struct work_struct *work);
163
164 /* extended register access functions */
165
166 #define BROADCAST_ADDR 31
167
168 static inline int broadcast_write(struct mii_bus *bus, u32 regnum, u16 val)
169 {
170 return mdiobus_write(bus, BROADCAST_ADDR, regnum, val);
171 }
172
173 /* Caller must hold extreg_lock. */
174 static int ext_read(struct phy_device *phydev, int page, u32 regnum)
175 {
176 struct dp83640_private *dp83640 = phydev->priv;
177 int val;
178
179 if (dp83640->clock->page != page) {
180 broadcast_write(phydev->bus, PAGESEL, page);
181 dp83640->clock->page = page;
182 }
183 val = phy_read(phydev, regnum);
184
185 return val;
186 }
187
188 /* Caller must hold extreg_lock. */
189 static void ext_write(int broadcast, struct phy_device *phydev,
190 int page, u32 regnum, u16 val)
191 {
192 struct dp83640_private *dp83640 = phydev->priv;
193
194 if (dp83640->clock->page != page) {
195 broadcast_write(phydev->bus, PAGESEL, page);
196 dp83640->clock->page = page;
197 }
198 if (broadcast)
199 broadcast_write(phydev->bus, regnum, val);
200 else
201 phy_write(phydev, regnum, val);
202 }
203
204 /* Caller must hold extreg_lock. */
205 static int tdr_write(int bc, struct phy_device *dev,
206 const struct timespec *ts, u16 cmd)
207 {
208 ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_nsec & 0xffff);/* ns[15:0] */
209 ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_nsec >> 16); /* ns[31:16] */
210 ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_sec & 0xffff); /* sec[15:0] */
211 ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_sec >> 16); /* sec[31:16]*/
212
213 ext_write(bc, dev, PAGE4, PTP_CTL, cmd);
214
215 return 0;
216 }
217
218 /* convert phy timestamps into driver timestamps */
219
220 static void phy2rxts(struct phy_rxts *p, struct rxts *rxts)
221 {
222 u32 sec;
223
224 sec = p->sec_lo;
225 sec |= p->sec_hi << 16;
226
227 rxts->ns = p->ns_lo;
228 rxts->ns |= (p->ns_hi & 0x3fff) << 16;
229 rxts->ns += ((u64)sec) * 1000000000ULL;
230 rxts->seqid = p->seqid;
231 rxts->msgtype = (p->msgtype >> 12) & 0xf;
232 rxts->hash = p->msgtype & 0x0fff;
233 rxts->tmo = jiffies + 2;
234 }
235
236 static u64 phy2txts(struct phy_txts *p)
237 {
238 u64 ns;
239 u32 sec;
240
241 sec = p->sec_lo;
242 sec |= p->sec_hi << 16;
243
244 ns = p->ns_lo;
245 ns |= (p->ns_hi & 0x3fff) << 16;
246 ns += ((u64)sec) * 1000000000ULL;
247
248 return ns;
249 }
250
251 static void periodic_output(struct dp83640_clock *clock,
252 struct ptp_clock_request *clkreq, bool on)
253 {
254 struct dp83640_private *dp83640 = clock->chosen;
255 struct phy_device *phydev = dp83640->phydev;
256 u32 sec, nsec, period;
257 u16 gpio, ptp_trig, trigger, val;
258
259 gpio = on ? gpio_tab[PEROUT_GPIO] : 0;
260 trigger = PER_TRIGGER;
261
262 ptp_trig = TRIG_WR |
263 (trigger & TRIG_CSEL_MASK) << TRIG_CSEL_SHIFT |
264 (gpio & TRIG_GPIO_MASK) << TRIG_GPIO_SHIFT |
265 TRIG_PER |
266 TRIG_PULSE;
267
268 val = (trigger & TRIG_SEL_MASK) << TRIG_SEL_SHIFT;
269
270 if (!on) {
271 val |= TRIG_DIS;
272 mutex_lock(&clock->extreg_lock);
273 ext_write(0, phydev, PAGE5, PTP_TRIG, ptp_trig);
274 ext_write(0, phydev, PAGE4, PTP_CTL, val);
275 mutex_unlock(&clock->extreg_lock);
276 return;
277 }
278
279 sec = clkreq->perout.start.sec;
280 nsec = clkreq->perout.start.nsec;
281 period = clkreq->perout.period.sec * 1000000000UL;
282 period += clkreq->perout.period.nsec;
283
284 mutex_lock(&clock->extreg_lock);
285
286 ext_write(0, phydev, PAGE5, PTP_TRIG, ptp_trig);
287
288 /*load trigger*/
289 val |= TRIG_LOAD;
290 ext_write(0, phydev, PAGE4, PTP_CTL, val);
291 ext_write(0, phydev, PAGE4, PTP_TDR, nsec & 0xffff); /* ns[15:0] */
292 ext_write(0, phydev, PAGE4, PTP_TDR, nsec >> 16); /* ns[31:16] */
293 ext_write(0, phydev, PAGE4, PTP_TDR, sec & 0xffff); /* sec[15:0] */
294 ext_write(0, phydev, PAGE4, PTP_TDR, sec >> 16); /* sec[31:16] */
295 ext_write(0, phydev, PAGE4, PTP_TDR, period & 0xffff); /* ns[15:0] */
296 ext_write(0, phydev, PAGE4, PTP_TDR, period >> 16); /* ns[31:16] */
297
298 /*enable trigger*/
299 val &= ~TRIG_LOAD;
300 val |= TRIG_EN;
301 ext_write(0, phydev, PAGE4, PTP_CTL, val);
302
303 mutex_unlock(&clock->extreg_lock);
304 }
305
306 /* ptp clock methods */
307
308 static int ptp_dp83640_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
309 {
310 struct dp83640_clock *clock =
311 container_of(ptp, struct dp83640_clock, caps);
312 struct phy_device *phydev = clock->chosen->phydev;
313 u64 rate;
314 int neg_adj = 0;
315 u16 hi, lo;
316
317 if (ppb < 0) {
318 neg_adj = 1;
319 ppb = -ppb;
320 }
321 rate = ppb;
322 rate <<= 26;
323 rate = div_u64(rate, 1953125);
324
325 hi = (rate >> 16) & PTP_RATE_HI_MASK;
326 if (neg_adj)
327 hi |= PTP_RATE_DIR;
328
329 lo = rate & 0xffff;
330
331 mutex_lock(&clock->extreg_lock);
332
333 ext_write(1, phydev, PAGE4, PTP_RATEH, hi);
334 ext_write(1, phydev, PAGE4, PTP_RATEL, lo);
335
336 mutex_unlock(&clock->extreg_lock);
337
338 return 0;
339 }
340
341 static int ptp_dp83640_adjtime(struct ptp_clock_info *ptp, s64 delta)
342 {
343 struct dp83640_clock *clock =
344 container_of(ptp, struct dp83640_clock, caps);
345 struct phy_device *phydev = clock->chosen->phydev;
346 struct timespec ts;
347 int err;
348
349 delta += ADJTIME_FIX;
350
351 ts = ns_to_timespec(delta);
352
353 mutex_lock(&clock->extreg_lock);
354
355 err = tdr_write(1, phydev, &ts, PTP_STEP_CLK);
356
357 mutex_unlock(&clock->extreg_lock);
358
359 return err;
360 }
361
362 static int ptp_dp83640_gettime(struct ptp_clock_info *ptp, struct timespec *ts)
363 {
364 struct dp83640_clock *clock =
365 container_of(ptp, struct dp83640_clock, caps);
366 struct phy_device *phydev = clock->chosen->phydev;
367 unsigned int val[4];
368
369 mutex_lock(&clock->extreg_lock);
370
371 ext_write(0, phydev, PAGE4, PTP_CTL, PTP_RD_CLK);
372
373 val[0] = ext_read(phydev, PAGE4, PTP_TDR); /* ns[15:0] */
374 val[1] = ext_read(phydev, PAGE4, PTP_TDR); /* ns[31:16] */
375 val[2] = ext_read(phydev, PAGE4, PTP_TDR); /* sec[15:0] */
376 val[3] = ext_read(phydev, PAGE4, PTP_TDR); /* sec[31:16] */
377
378 mutex_unlock(&clock->extreg_lock);
379
380 ts->tv_nsec = val[0] | (val[1] << 16);
381 ts->tv_sec = val[2] | (val[3] << 16);
382
383 return 0;
384 }
385
386 static int ptp_dp83640_settime(struct ptp_clock_info *ptp,
387 const struct timespec *ts)
388 {
389 struct dp83640_clock *clock =
390 container_of(ptp, struct dp83640_clock, caps);
391 struct phy_device *phydev = clock->chosen->phydev;
392 int err;
393
394 mutex_lock(&clock->extreg_lock);
395
396 err = tdr_write(1, phydev, ts, PTP_LOAD_CLK);
397
398 mutex_unlock(&clock->extreg_lock);
399
400 return err;
401 }
402
403 static int ptp_dp83640_enable(struct ptp_clock_info *ptp,
404 struct ptp_clock_request *rq, int on)
405 {
406 struct dp83640_clock *clock =
407 container_of(ptp, struct dp83640_clock, caps);
408 struct phy_device *phydev = clock->chosen->phydev;
409 int index;
410 u16 evnt, event_num, gpio_num;
411
412 switch (rq->type) {
413 case PTP_CLK_REQ_EXTTS:
414 index = rq->extts.index;
415 if (index < 0 || index >= N_EXT_TS)
416 return -EINVAL;
417 event_num = EXT_EVENT + index;
418 evnt = EVNT_WR | (event_num & EVNT_SEL_MASK) << EVNT_SEL_SHIFT;
419 if (on) {
420 gpio_num = gpio_tab[EXTTS0_GPIO + index];
421 evnt |= (gpio_num & EVNT_GPIO_MASK) << EVNT_GPIO_SHIFT;
422 evnt |= EVNT_RISE;
423 }
424 ext_write(0, phydev, PAGE5, PTP_EVNT, evnt);
425 return 0;
426
427 case PTP_CLK_REQ_PEROUT:
428 if (rq->perout.index != 0)
429 return -EINVAL;
430 periodic_output(clock, rq, on);
431 return 0;
432
433 default:
434 break;
435 }
436
437 return -EOPNOTSUPP;
438 }
439
440 static u8 status_frame_dst[6] = { 0x01, 0x1B, 0x19, 0x00, 0x00, 0x00 };
441 static u8 status_frame_src[6] = { 0x08, 0x00, 0x17, 0x0B, 0x6B, 0x0F };
442
443 static void enable_status_frames(struct phy_device *phydev, bool on)
444 {
445 u16 cfg0 = 0, ver;
446
447 if (on)
448 cfg0 = PSF_EVNT_EN | PSF_RXTS_EN | PSF_TXTS_EN | ENDIAN_FLAG;
449
450 ver = (PSF_PTPVER & VERSIONPTP_MASK) << VERSIONPTP_SHIFT;
451
452 ext_write(0, phydev, PAGE5, PSF_CFG0, cfg0);
453 ext_write(0, phydev, PAGE6, PSF_CFG1, ver);
454
455 if (!phydev->attached_dev) {
456 pr_warning("dp83640: expected to find an attached netdevice\n");
457 return;
458 }
459
460 if (on) {
461 if (dev_mc_add(phydev->attached_dev, status_frame_dst))
462 pr_warning("dp83640: failed to add mc address\n");
463 } else {
464 if (dev_mc_del(phydev->attached_dev, status_frame_dst))
465 pr_warning("dp83640: failed to delete mc address\n");
466 }
467 }
468
469 static bool is_status_frame(struct sk_buff *skb, int type)
470 {
471 struct ethhdr *h = eth_hdr(skb);
472
473 if (PTP_CLASS_V2_L2 == type &&
474 !memcmp(h->h_source, status_frame_src, sizeof(status_frame_src)))
475 return true;
476 else
477 return false;
478 }
479
480 static int expired(struct rxts *rxts)
481 {
482 return time_after(jiffies, rxts->tmo);
483 }
484
485 /* Caller must hold rx_lock. */
486 static void prune_rx_ts(struct dp83640_private *dp83640)
487 {
488 struct list_head *this, *next;
489 struct rxts *rxts;
490
491 list_for_each_safe(this, next, &dp83640->rxts) {
492 rxts = list_entry(this, struct rxts, list);
493 if (expired(rxts)) {
494 list_del_init(&rxts->list);
495 list_add(&rxts->list, &dp83640->rxpool);
496 }
497 }
498 }
499
500 /* synchronize the phyters so they act as one clock */
501
502 static void enable_broadcast(struct phy_device *phydev, int init_page, int on)
503 {
504 int val;
505 phy_write(phydev, PAGESEL, 0);
506 val = phy_read(phydev, PHYCR2);
507 if (on)
508 val |= BC_WRITE;
509 else
510 val &= ~BC_WRITE;
511 phy_write(phydev, PHYCR2, val);
512 phy_write(phydev, PAGESEL, init_page);
513 }
514
515 static void recalibrate(struct dp83640_clock *clock)
516 {
517 s64 now, diff;
518 struct phy_txts event_ts;
519 struct timespec ts;
520 struct list_head *this;
521 struct dp83640_private *tmp;
522 struct phy_device *master = clock->chosen->phydev;
523 u16 cal_gpio, cfg0, evnt, ptp_trig, trigger, val;
524
525 trigger = CAL_TRIGGER;
526 cal_gpio = gpio_tab[CALIBRATE_GPIO];
527
528 mutex_lock(&clock->extreg_lock);
529
530 /*
531 * enable broadcast, disable status frames, enable ptp clock
532 */
533 list_for_each(this, &clock->phylist) {
534 tmp = list_entry(this, struct dp83640_private, list);
535 enable_broadcast(tmp->phydev, clock->page, 1);
536 tmp->cfg0 = ext_read(tmp->phydev, PAGE5, PSF_CFG0);
537 ext_write(0, tmp->phydev, PAGE5, PSF_CFG0, 0);
538 ext_write(0, tmp->phydev, PAGE4, PTP_CTL, PTP_ENABLE);
539 }
540 enable_broadcast(master, clock->page, 1);
541 cfg0 = ext_read(master, PAGE5, PSF_CFG0);
542 ext_write(0, master, PAGE5, PSF_CFG0, 0);
543 ext_write(0, master, PAGE4, PTP_CTL, PTP_ENABLE);
544
545 /*
546 * enable an event timestamp
547 */
548 evnt = EVNT_WR | EVNT_RISE | EVNT_SINGLE;
549 evnt |= (CAL_EVENT & EVNT_SEL_MASK) << EVNT_SEL_SHIFT;
550 evnt |= (cal_gpio & EVNT_GPIO_MASK) << EVNT_GPIO_SHIFT;
551
552 list_for_each(this, &clock->phylist) {
553 tmp = list_entry(this, struct dp83640_private, list);
554 ext_write(0, tmp->phydev, PAGE5, PTP_EVNT, evnt);
555 }
556 ext_write(0, master, PAGE5, PTP_EVNT, evnt);
557
558 /*
559 * configure a trigger
560 */
561 ptp_trig = TRIG_WR | TRIG_IF_LATE | TRIG_PULSE;
562 ptp_trig |= (trigger & TRIG_CSEL_MASK) << TRIG_CSEL_SHIFT;
563 ptp_trig |= (cal_gpio & TRIG_GPIO_MASK) << TRIG_GPIO_SHIFT;
564 ext_write(0, master, PAGE5, PTP_TRIG, ptp_trig);
565
566 /* load trigger */
567 val = (trigger & TRIG_SEL_MASK) << TRIG_SEL_SHIFT;
568 val |= TRIG_LOAD;
569 ext_write(0, master, PAGE4, PTP_CTL, val);
570
571 /* enable trigger */
572 val &= ~TRIG_LOAD;
573 val |= TRIG_EN;
574 ext_write(0, master, PAGE4, PTP_CTL, val);
575
576 /* disable trigger */
577 val = (trigger & TRIG_SEL_MASK) << TRIG_SEL_SHIFT;
578 val |= TRIG_DIS;
579 ext_write(0, master, PAGE4, PTP_CTL, val);
580
581 /*
582 * read out and correct offsets
583 */
584 val = ext_read(master, PAGE4, PTP_STS);
585 pr_info("master PTP_STS 0x%04hx", val);
586 val = ext_read(master, PAGE4, PTP_ESTS);
587 pr_info("master PTP_ESTS 0x%04hx", val);
588 event_ts.ns_lo = ext_read(master, PAGE4, PTP_EDATA);
589 event_ts.ns_hi = ext_read(master, PAGE4, PTP_EDATA);
590 event_ts.sec_lo = ext_read(master, PAGE4, PTP_EDATA);
591 event_ts.sec_hi = ext_read(master, PAGE4, PTP_EDATA);
592 now = phy2txts(&event_ts);
593
594 list_for_each(this, &clock->phylist) {
595 tmp = list_entry(this, struct dp83640_private, list);
596 val = ext_read(tmp->phydev, PAGE4, PTP_STS);
597 pr_info("slave PTP_STS 0x%04hx", val);
598 val = ext_read(tmp->phydev, PAGE4, PTP_ESTS);
599 pr_info("slave PTP_ESTS 0x%04hx", val);
600 event_ts.ns_lo = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
601 event_ts.ns_hi = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
602 event_ts.sec_lo = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
603 event_ts.sec_hi = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
604 diff = now - (s64) phy2txts(&event_ts);
605 pr_info("slave offset %lld nanoseconds\n", diff);
606 diff += ADJTIME_FIX;
607 ts = ns_to_timespec(diff);
608 tdr_write(0, tmp->phydev, &ts, PTP_STEP_CLK);
609 }
610
611 /*
612 * restore status frames
613 */
614 list_for_each(this, &clock->phylist) {
615 tmp = list_entry(this, struct dp83640_private, list);
616 ext_write(0, tmp->phydev, PAGE5, PSF_CFG0, tmp->cfg0);
617 }
618 ext_write(0, master, PAGE5, PSF_CFG0, cfg0);
619
620 mutex_unlock(&clock->extreg_lock);
621 }
622
623 /* time stamping methods */
624
625 static inline u16 exts_chan_to_edata(int ch)
626 {
627 return 1 << ((ch + EXT_EVENT) * 2);
628 }
629
630 static int decode_evnt(struct dp83640_private *dp83640,
631 void *data, u16 ests)
632 {
633 struct phy_txts *phy_txts;
634 struct ptp_clock_event event;
635 int i, parsed;
636 int words = (ests >> EVNT_TS_LEN_SHIFT) & EVNT_TS_LEN_MASK;
637 u16 ext_status = 0;
638
639 if (ests & MULT_EVNT) {
640 ext_status = *(u16 *) data;
641 data += sizeof(ext_status);
642 }
643
644 phy_txts = data;
645
646 switch (words) { /* fall through in every case */
647 case 3:
648 dp83640->edata.sec_hi = phy_txts->sec_hi;
649 case 2:
650 dp83640->edata.sec_lo = phy_txts->sec_lo;
651 case 1:
652 dp83640->edata.ns_hi = phy_txts->ns_hi;
653 case 0:
654 dp83640->edata.ns_lo = phy_txts->ns_lo;
655 }
656
657 if (ext_status) {
658 parsed = words + 2;
659 } else {
660 parsed = words + 1;
661 i = ((ests >> EVNT_NUM_SHIFT) & EVNT_NUM_MASK) - EXT_EVENT;
662 ext_status = exts_chan_to_edata(i);
663 }
664
665 event.type = PTP_CLOCK_EXTTS;
666 event.timestamp = phy2txts(&dp83640->edata);
667
668 for (i = 0; i < N_EXT_TS; i++) {
669 if (ext_status & exts_chan_to_edata(i)) {
670 event.index = i;
671 ptp_clock_event(dp83640->clock->ptp_clock, &event);
672 }
673 }
674
675 return parsed * sizeof(u16);
676 }
677
678 static void decode_rxts(struct dp83640_private *dp83640,
679 struct phy_rxts *phy_rxts)
680 {
681 struct rxts *rxts;
682 unsigned long flags;
683
684 spin_lock_irqsave(&dp83640->rx_lock, flags);
685
686 prune_rx_ts(dp83640);
687
688 if (list_empty(&dp83640->rxpool)) {
689 pr_debug("dp83640: rx timestamp pool is empty\n");
690 goto out;
691 }
692 rxts = list_first_entry(&dp83640->rxpool, struct rxts, list);
693 list_del_init(&rxts->list);
694 phy2rxts(phy_rxts, rxts);
695 list_add_tail(&rxts->list, &dp83640->rxts);
696 out:
697 spin_unlock_irqrestore(&dp83640->rx_lock, flags);
698 }
699
700 static void decode_txts(struct dp83640_private *dp83640,
701 struct phy_txts *phy_txts)
702 {
703 struct skb_shared_hwtstamps shhwtstamps;
704 struct sk_buff *skb;
705 u64 ns;
706
707 /* We must already have the skb that triggered this. */
708
709 skb = skb_dequeue(&dp83640->tx_queue);
710
711 if (!skb) {
712 pr_debug("dp83640: have timestamp but tx_queue empty\n");
713 return;
714 }
715 ns = phy2txts(phy_txts);
716 memset(&shhwtstamps, 0, sizeof(shhwtstamps));
717 shhwtstamps.hwtstamp = ns_to_ktime(ns);
718 skb_complete_tx_timestamp(skb, &shhwtstamps);
719 }
720
721 static void decode_status_frame(struct dp83640_private *dp83640,
722 struct sk_buff *skb)
723 {
724 struct phy_rxts *phy_rxts;
725 struct phy_txts *phy_txts;
726 u8 *ptr;
727 int len, size;
728 u16 ests, type;
729
730 ptr = skb->data + 2;
731
732 for (len = skb_headlen(skb) - 2; len > sizeof(type); len -= size) {
733
734 type = *(u16 *)ptr;
735 ests = type & 0x0fff;
736 type = type & 0xf000;
737 len -= sizeof(type);
738 ptr += sizeof(type);
739
740 if (PSF_RX == type && len >= sizeof(*phy_rxts)) {
741
742 phy_rxts = (struct phy_rxts *) ptr;
743 decode_rxts(dp83640, phy_rxts);
744 size = sizeof(*phy_rxts);
745
746 } else if (PSF_TX == type && len >= sizeof(*phy_txts)) {
747
748 phy_txts = (struct phy_txts *) ptr;
749 decode_txts(dp83640, phy_txts);
750 size = sizeof(*phy_txts);
751
752 } else if (PSF_EVNT == type && len >= sizeof(*phy_txts)) {
753
754 size = decode_evnt(dp83640, ptr, ests);
755
756 } else {
757 size = 0;
758 break;
759 }
760 ptr += size;
761 }
762 }
763
764 static int is_sync(struct sk_buff *skb, int type)
765 {
766 u8 *data = skb->data, *msgtype;
767 unsigned int offset = 0;
768
769 switch (type) {
770 case PTP_CLASS_V1_IPV4:
771 case PTP_CLASS_V2_IPV4:
772 offset = ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
773 break;
774 case PTP_CLASS_V1_IPV6:
775 case PTP_CLASS_V2_IPV6:
776 offset = OFF_PTP6;
777 break;
778 case PTP_CLASS_V2_L2:
779 offset = ETH_HLEN;
780 break;
781 case PTP_CLASS_V2_VLAN:
782 offset = ETH_HLEN + VLAN_HLEN;
783 break;
784 default:
785 return 0;
786 }
787
788 if (type & PTP_CLASS_V1)
789 offset += OFF_PTP_CONTROL;
790
791 if (skb->len < offset + 1)
792 return 0;
793
794 msgtype = data + offset;
795
796 return (*msgtype & 0xf) == 0;
797 }
798
799 static int match(struct sk_buff *skb, unsigned int type, struct rxts *rxts)
800 {
801 u16 *seqid;
802 unsigned int offset;
803 u8 *msgtype, *data = skb_mac_header(skb);
804
805 /* check sequenceID, messageType, 12 bit hash of offset 20-29 */
806
807 switch (type) {
808 case PTP_CLASS_V1_IPV4:
809 case PTP_CLASS_V2_IPV4:
810 offset = ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
811 break;
812 case PTP_CLASS_V1_IPV6:
813 case PTP_CLASS_V2_IPV6:
814 offset = OFF_PTP6;
815 break;
816 case PTP_CLASS_V2_L2:
817 offset = ETH_HLEN;
818 break;
819 case PTP_CLASS_V2_VLAN:
820 offset = ETH_HLEN + VLAN_HLEN;
821 break;
822 default:
823 return 0;
824 }
825
826 if (skb->len + ETH_HLEN < offset + OFF_PTP_SEQUENCE_ID + sizeof(*seqid))
827 return 0;
828
829 if (unlikely(type & PTP_CLASS_V1))
830 msgtype = data + offset + OFF_PTP_CONTROL;
831 else
832 msgtype = data + offset;
833
834 seqid = (u16 *)(data + offset + OFF_PTP_SEQUENCE_ID);
835
836 return (rxts->msgtype == (*msgtype & 0xf) &&
837 rxts->seqid == ntohs(*seqid));
838 }
839
840 static void dp83640_free_clocks(void)
841 {
842 struct dp83640_clock *clock;
843 struct list_head *this, *next;
844
845 mutex_lock(&phyter_clocks_lock);
846
847 list_for_each_safe(this, next, &phyter_clocks) {
848 clock = list_entry(this, struct dp83640_clock, list);
849 if (!list_empty(&clock->phylist)) {
850 pr_warning("phy list non-empty while unloading");
851 BUG();
852 }
853 list_del(&clock->list);
854 mutex_destroy(&clock->extreg_lock);
855 mutex_destroy(&clock->clock_lock);
856 put_device(&clock->bus->dev);
857 kfree(clock);
858 }
859
860 mutex_unlock(&phyter_clocks_lock);
861 }
862
863 static void dp83640_clock_init(struct dp83640_clock *clock, struct mii_bus *bus)
864 {
865 INIT_LIST_HEAD(&clock->list);
866 clock->bus = bus;
867 mutex_init(&clock->extreg_lock);
868 mutex_init(&clock->clock_lock);
869 INIT_LIST_HEAD(&clock->phylist);
870 clock->caps.owner = THIS_MODULE;
871 sprintf(clock->caps.name, "dp83640 timer");
872 clock->caps.max_adj = 1953124;
873 clock->caps.n_alarm = 0;
874 clock->caps.n_ext_ts = N_EXT_TS;
875 clock->caps.n_per_out = 1;
876 clock->caps.pps = 0;
877 clock->caps.adjfreq = ptp_dp83640_adjfreq;
878 clock->caps.adjtime = ptp_dp83640_adjtime;
879 clock->caps.gettime = ptp_dp83640_gettime;
880 clock->caps.settime = ptp_dp83640_settime;
881 clock->caps.enable = ptp_dp83640_enable;
882 /*
883 * Get a reference to this bus instance.
884 */
885 get_device(&bus->dev);
886 }
887
888 static int choose_this_phy(struct dp83640_clock *clock,
889 struct phy_device *phydev)
890 {
891 if (chosen_phy == -1 && !clock->chosen)
892 return 1;
893
894 if (chosen_phy == phydev->addr)
895 return 1;
896
897 return 0;
898 }
899
900 static struct dp83640_clock *dp83640_clock_get(struct dp83640_clock *clock)
901 {
902 if (clock)
903 mutex_lock(&clock->clock_lock);
904 return clock;
905 }
906
907 /*
908 * Look up and lock a clock by bus instance.
909 * If there is no clock for this bus, then create it first.
910 */
911 static struct dp83640_clock *dp83640_clock_get_bus(struct mii_bus *bus)
912 {
913 struct dp83640_clock *clock = NULL, *tmp;
914 struct list_head *this;
915
916 mutex_lock(&phyter_clocks_lock);
917
918 list_for_each(this, &phyter_clocks) {
919 tmp = list_entry(this, struct dp83640_clock, list);
920 if (tmp->bus == bus) {
921 clock = tmp;
922 break;
923 }
924 }
925 if (clock)
926 goto out;
927
928 clock = kzalloc(sizeof(struct dp83640_clock), GFP_KERNEL);
929 if (!clock)
930 goto out;
931
932 dp83640_clock_init(clock, bus);
933 list_add_tail(&phyter_clocks, &clock->list);
934 out:
935 mutex_unlock(&phyter_clocks_lock);
936
937 return dp83640_clock_get(clock);
938 }
939
940 static void dp83640_clock_put(struct dp83640_clock *clock)
941 {
942 mutex_unlock(&clock->clock_lock);
943 }
944
945 static int dp83640_probe(struct phy_device *phydev)
946 {
947 struct dp83640_clock *clock;
948 struct dp83640_private *dp83640;
949 int err = -ENOMEM, i;
950
951 if (phydev->addr == BROADCAST_ADDR)
952 return 0;
953
954 clock = dp83640_clock_get_bus(phydev->bus);
955 if (!clock)
956 goto no_clock;
957
958 dp83640 = kzalloc(sizeof(struct dp83640_private), GFP_KERNEL);
959 if (!dp83640)
960 goto no_memory;
961
962 dp83640->phydev = phydev;
963 INIT_WORK(&dp83640->ts_work, rx_timestamp_work);
964
965 INIT_LIST_HEAD(&dp83640->rxts);
966 INIT_LIST_HEAD(&dp83640->rxpool);
967 for (i = 0; i < MAX_RXTS; i++)
968 list_add(&dp83640->rx_pool_data[i].list, &dp83640->rxpool);
969
970 phydev->priv = dp83640;
971
972 spin_lock_init(&dp83640->rx_lock);
973 skb_queue_head_init(&dp83640->rx_queue);
974 skb_queue_head_init(&dp83640->tx_queue);
975
976 dp83640->clock = clock;
977
978 if (choose_this_phy(clock, phydev)) {
979 clock->chosen = dp83640;
980 clock->ptp_clock = ptp_clock_register(&clock->caps);
981 if (IS_ERR(clock->ptp_clock)) {
982 err = PTR_ERR(clock->ptp_clock);
983 goto no_register;
984 }
985 } else
986 list_add_tail(&dp83640->list, &clock->phylist);
987
988 if (clock->chosen && !list_empty(&clock->phylist))
989 recalibrate(clock);
990 else
991 enable_broadcast(dp83640->phydev, clock->page, 1);
992
993 dp83640_clock_put(clock);
994 return 0;
995
996 no_register:
997 clock->chosen = NULL;
998 kfree(dp83640);
999 no_memory:
1000 dp83640_clock_put(clock);
1001 no_clock:
1002 return err;
1003 }
1004
1005 static void dp83640_remove(struct phy_device *phydev)
1006 {
1007 struct dp83640_clock *clock;
1008 struct list_head *this, *next;
1009 struct dp83640_private *tmp, *dp83640 = phydev->priv;
1010 struct sk_buff *skb;
1011
1012 if (phydev->addr == BROADCAST_ADDR)
1013 return;
1014
1015 enable_status_frames(phydev, false);
1016 cancel_work_sync(&dp83640->ts_work);
1017
1018 while ((skb = skb_dequeue(&dp83640->rx_queue)) != NULL)
1019 kfree_skb(skb);
1020
1021 while ((skb = skb_dequeue(&dp83640->tx_queue)) != NULL)
1022 skb_complete_tx_timestamp(skb, NULL);
1023
1024 clock = dp83640_clock_get(dp83640->clock);
1025
1026 if (dp83640 == clock->chosen) {
1027 ptp_clock_unregister(clock->ptp_clock);
1028 clock->chosen = NULL;
1029 } else {
1030 list_for_each_safe(this, next, &clock->phylist) {
1031 tmp = list_entry(this, struct dp83640_private, list);
1032 if (tmp == dp83640) {
1033 list_del_init(&tmp->list);
1034 break;
1035 }
1036 }
1037 }
1038
1039 dp83640_clock_put(clock);
1040 kfree(dp83640);
1041 }
1042
1043 static int dp83640_hwtstamp(struct phy_device *phydev, struct ifreq *ifr)
1044 {
1045 struct dp83640_private *dp83640 = phydev->priv;
1046 struct hwtstamp_config cfg;
1047 u16 txcfg0, rxcfg0;
1048
1049 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
1050 return -EFAULT;
1051
1052 if (cfg.flags) /* reserved for future extensions */
1053 return -EINVAL;
1054
1055 if (cfg.tx_type < 0 || cfg.tx_type > HWTSTAMP_TX_ONESTEP_SYNC)
1056 return -ERANGE;
1057
1058 dp83640->hwts_tx_en = cfg.tx_type;
1059
1060 switch (cfg.rx_filter) {
1061 case HWTSTAMP_FILTER_NONE:
1062 dp83640->hwts_rx_en = 0;
1063 dp83640->layer = 0;
1064 dp83640->version = 0;
1065 break;
1066 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
1067 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
1068 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
1069 dp83640->hwts_rx_en = 1;
1070 dp83640->layer = LAYER4;
1071 dp83640->version = 1;
1072 break;
1073 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
1074 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
1075 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
1076 dp83640->hwts_rx_en = 1;
1077 dp83640->layer = LAYER4;
1078 dp83640->version = 2;
1079 break;
1080 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
1081 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
1082 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
1083 dp83640->hwts_rx_en = 1;
1084 dp83640->layer = LAYER2;
1085 dp83640->version = 2;
1086 break;
1087 case HWTSTAMP_FILTER_PTP_V2_EVENT:
1088 case HWTSTAMP_FILTER_PTP_V2_SYNC:
1089 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
1090 dp83640->hwts_rx_en = 1;
1091 dp83640->layer = LAYER4|LAYER2;
1092 dp83640->version = 2;
1093 break;
1094 default:
1095 return -ERANGE;
1096 }
1097
1098 txcfg0 = (dp83640->version & TX_PTP_VER_MASK) << TX_PTP_VER_SHIFT;
1099 rxcfg0 = (dp83640->version & TX_PTP_VER_MASK) << TX_PTP_VER_SHIFT;
1100
1101 if (dp83640->layer & LAYER2) {
1102 txcfg0 |= TX_L2_EN;
1103 rxcfg0 |= RX_L2_EN;
1104 }
1105 if (dp83640->layer & LAYER4) {
1106 txcfg0 |= TX_IPV6_EN | TX_IPV4_EN;
1107 rxcfg0 |= RX_IPV6_EN | RX_IPV4_EN;
1108 }
1109
1110 if (dp83640->hwts_tx_en)
1111 txcfg0 |= TX_TS_EN;
1112
1113 if (dp83640->hwts_tx_en == HWTSTAMP_TX_ONESTEP_SYNC)
1114 txcfg0 |= SYNC_1STEP | CHK_1STEP;
1115
1116 if (dp83640->hwts_rx_en)
1117 rxcfg0 |= RX_TS_EN;
1118
1119 mutex_lock(&dp83640->clock->extreg_lock);
1120
1121 if (dp83640->hwts_tx_en || dp83640->hwts_rx_en) {
1122 enable_status_frames(phydev, true);
1123 ext_write(0, phydev, PAGE4, PTP_CTL, PTP_ENABLE);
1124 }
1125
1126 ext_write(0, phydev, PAGE5, PTP_TXCFG0, txcfg0);
1127 ext_write(0, phydev, PAGE5, PTP_RXCFG0, rxcfg0);
1128
1129 mutex_unlock(&dp83640->clock->extreg_lock);
1130
1131 return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? -EFAULT : 0;
1132 }
1133
1134 static void rx_timestamp_work(struct work_struct *work)
1135 {
1136 struct dp83640_private *dp83640 =
1137 container_of(work, struct dp83640_private, ts_work);
1138 struct list_head *this, *next;
1139 struct rxts *rxts;
1140 struct skb_shared_hwtstamps *shhwtstamps;
1141 struct sk_buff *skb;
1142 unsigned int type;
1143 unsigned long flags;
1144
1145 /* Deliver each deferred packet, with or without a time stamp. */
1146
1147 while ((skb = skb_dequeue(&dp83640->rx_queue)) != NULL) {
1148 type = SKB_PTP_TYPE(skb);
1149 spin_lock_irqsave(&dp83640->rx_lock, flags);
1150 list_for_each_safe(this, next, &dp83640->rxts) {
1151 rxts = list_entry(this, struct rxts, list);
1152 if (match(skb, type, rxts)) {
1153 shhwtstamps = skb_hwtstamps(skb);
1154 memset(shhwtstamps, 0, sizeof(*shhwtstamps));
1155 shhwtstamps->hwtstamp = ns_to_ktime(rxts->ns);
1156 list_del_init(&rxts->list);
1157 list_add(&rxts->list, &dp83640->rxpool);
1158 break;
1159 }
1160 }
1161 spin_unlock_irqrestore(&dp83640->rx_lock, flags);
1162 netif_rx_ni(skb);
1163 }
1164
1165 /* Clear out expired time stamps. */
1166
1167 spin_lock_irqsave(&dp83640->rx_lock, flags);
1168 prune_rx_ts(dp83640);
1169 spin_unlock_irqrestore(&dp83640->rx_lock, flags);
1170 }
1171
1172 static bool dp83640_rxtstamp(struct phy_device *phydev,
1173 struct sk_buff *skb, int type)
1174 {
1175 struct dp83640_private *dp83640 = phydev->priv;
1176
1177 if (!dp83640->hwts_rx_en)
1178 return false;
1179
1180 if (is_status_frame(skb, type)) {
1181 decode_status_frame(dp83640, skb);
1182 kfree_skb(skb);
1183 return true;
1184 }
1185
1186 SKB_PTP_TYPE(skb) = type;
1187 skb_queue_tail(&dp83640->rx_queue, skb);
1188 schedule_work(&dp83640->ts_work);
1189
1190 return true;
1191 }
1192
1193 static void dp83640_txtstamp(struct phy_device *phydev,
1194 struct sk_buff *skb, int type)
1195 {
1196 struct dp83640_private *dp83640 = phydev->priv;
1197
1198 switch (dp83640->hwts_tx_en) {
1199
1200 case HWTSTAMP_TX_ONESTEP_SYNC:
1201 if (is_sync(skb, type)) {
1202 skb_complete_tx_timestamp(skb, NULL);
1203 return;
1204 }
1205 /* fall through */
1206 case HWTSTAMP_TX_ON:
1207 skb_queue_tail(&dp83640->tx_queue, skb);
1208 schedule_work(&dp83640->ts_work);
1209 break;
1210
1211 case HWTSTAMP_TX_OFF:
1212 default:
1213 skb_complete_tx_timestamp(skb, NULL);
1214 break;
1215 }
1216 }
1217
1218 static struct phy_driver dp83640_driver = {
1219 .phy_id = DP83640_PHY_ID,
1220 .phy_id_mask = 0xfffffff0,
1221 .name = "NatSemi DP83640",
1222 .features = PHY_BASIC_FEATURES,
1223 .flags = 0,
1224 .probe = dp83640_probe,
1225 .remove = dp83640_remove,
1226 .config_aneg = genphy_config_aneg,
1227 .read_status = genphy_read_status,
1228 .hwtstamp = dp83640_hwtstamp,
1229 .rxtstamp = dp83640_rxtstamp,
1230 .txtstamp = dp83640_txtstamp,
1231 .driver = {.owner = THIS_MODULE,}
1232 };
1233
1234 static int __init dp83640_init(void)
1235 {
1236 return phy_driver_register(&dp83640_driver);
1237 }
1238
1239 static void __exit dp83640_exit(void)
1240 {
1241 dp83640_free_clocks();
1242 phy_driver_unregister(&dp83640_driver);
1243 }
1244
1245 MODULE_DESCRIPTION("National Semiconductor DP83640 PHY driver");
1246 MODULE_AUTHOR("Richard Cochran <richard.cochran@omicron.at>");
1247 MODULE_LICENSE("GPL");
1248
1249 module_init(dp83640_init);
1250 module_exit(dp83640_exit);
1251
1252 static struct mdio_device_id __maybe_unused dp83640_tbl[] = {
1253 { DP83640_PHY_ID, 0xfffffff0 },
1254 { }
1255 };
1256
1257 MODULE_DEVICE_TABLE(mdio, dp83640_tbl);