1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (C) 2018 MOSER-BAER AG
4 //
5
6 #define pr_fmt(fmt) "InES_PTP: " fmt
7
8 #include <linux/ethtool.h>
9 #include <linux/export.h>
10 #include <linux/if_vlan.h>
11 #include <linux/mii_timestamper.h>
12 #include <linux/module.h>
13 #include <linux/net_tstamp.h>
14 #include <linux/of.h>
15 #include <linux/of_address.h>
16 #include <linux/of_irq.h>
17 #include <linux/phy.h>
18 #include <linux/platform_device.h>
19 #include <linux/ptp_classify.h>
20 #include <linux/ptp_clock_kernel.h>
21 #include <linux/stddef.h>
22
23 MODULE_DESCRIPTION("Driver for the ZHAW InES PTP time stamping IP core");
24 MODULE_AUTHOR("Richard Cochran <richardcochran@gmail.com>");
25 MODULE_VERSION("1.0");
26 MODULE_LICENSE("GPL");
27
28 /* GLOBAL register */
29 #define MCAST_MAC_SELECT_SHIFT 2
30 #define MCAST_MAC_SELECT_MASK 0x3
31 #define IO_RESET BIT(1)
32 #define PTP_RESET BIT(0)
33
34 /* VERSION register */
35 #define IF_MAJOR_VER_SHIFT 12
36 #define IF_MAJOR_VER_MASK 0xf
37 #define IF_MINOR_VER_SHIFT 8
38 #define IF_MINOR_VER_MASK 0xf
39 #define FPGA_MAJOR_VER_SHIFT 4
40 #define FPGA_MAJOR_VER_MASK 0xf
41 #define FPGA_MINOR_VER_SHIFT 0
42 #define FPGA_MINOR_VER_MASK 0xf
43
44 /* INT_STAT register */
45 #define RX_INTR_STATUS_3 BIT(5)
46 #define RX_INTR_STATUS_2 BIT(4)
47 #define RX_INTR_STATUS_1 BIT(3)
48 #define TX_INTR_STATUS_3 BIT(2)
49 #define TX_INTR_STATUS_2 BIT(1)
50 #define TX_INTR_STATUS_1 BIT(0)
51
52 /* INT_MSK register */
53 #define RX_INTR_MASK_3 BIT(5)
54 #define RX_INTR_MASK_2 BIT(4)
55 #define RX_INTR_MASK_1 BIT(3)
56 #define TX_INTR_MASK_3 BIT(2)
57 #define TX_INTR_MASK_2 BIT(1)
58 #define TX_INTR_MASK_1 BIT(0)
59
60 /* BUF_STAT register */
61 #define RX_FIFO_NE_3 BIT(5)
62 #define RX_FIFO_NE_2 BIT(4)
63 #define RX_FIFO_NE_1 BIT(3)
64 #define TX_FIFO_NE_3 BIT(2)
65 #define TX_FIFO_NE_2 BIT(1)
66 #define TX_FIFO_NE_1 BIT(0)
67
68 /* PORT_CONF register */
69 #define CM_ONE_STEP BIT(6)
70 #define PHY_SPEED_SHIFT 4
71 #define PHY_SPEED_MASK 0x3
72 #define P2P_DELAY_WR_POS_SHIFT 2
73 #define P2P_DELAY_WR_POS_MASK 0x3
74 #define PTP_MODE_SHIFT 0
75 #define PTP_MODE_MASK 0x3
76
77 /* TS_STAT_TX register */
78 #define TS_ENABLE BIT(15)
79 #define DATA_READ_POS_SHIFT 8
80 #define DATA_READ_POS_MASK 0x1f
81 #define DISCARDED_EVENTS_SHIFT 4
82 #define DISCARDED_EVENTS_MASK 0xf
83
84 #define INES_N_PORTS 3
85 #define INES_REGISTER_SIZE 0x80
86 #define INES_PORT_OFFSET 0x20
87 #define INES_PORT_SIZE 0x20
88 #define INES_FIFO_DEPTH 90
89 #define INES_MAX_EVENTS 100
90
91 #define BC_PTP_V1 0
92 #define BC_PTP_V2 1
93 #define TC_E2E_PTP_V2 2
94 #define TC_P2P_PTP_V2 3
95
96 #define PHY_SPEED_10 0
97 #define PHY_SPEED_100 1
98 #define PHY_SPEED_1000 2
99
100 #define PORT_CONF \
101 ((PHY_SPEED_1000 << PHY_SPEED_SHIFT) | (BC_PTP_V2 << PTP_MODE_SHIFT))
102
103 #define ines_read32(s, r) __raw_readl((void __iomem *)&s->regs->r)
104 #define ines_write32(s, v, r) __raw_writel(v, (void __iomem *)&s->regs->r)
105
106 #define MESSAGE_TYPE_SYNC 1
107 #define MESSAGE_TYPE_P_DELAY_REQ 2
108 #define MESSAGE_TYPE_P_DELAY_RESP 3
109 #define MESSAGE_TYPE_DELAY_REQ 4
110
111 static LIST_HEAD(ines_clocks);
112 static DEFINE_MUTEX(ines_clocks_lock);
113
114 struct ines_global_regs {
115 u32 id;
116 u32 test;
117 u32 global;
118 u32 version;
119 u32 test2;
120 u32 int_stat;
121 u32 int_msk;
122 u32 buf_stat;
123 };
124
125 struct ines_port_registers {
126 u32 port_conf;
127 u32 p_delay;
128 u32 ts_stat_tx;
129 u32 ts_stat_rx;
130 u32 ts_tx;
131 u32 ts_rx;
132 };
133
134 struct ines_timestamp {
135 struct list_head list;
136 unsigned long tmo;
137 u16 tag;
138 u64 sec;
139 u64 nsec;
140 u64 clkid;
141 u16 portnum;
142 u16 seqid;
143 };
144
145 struct ines_port {
146 struct ines_port_registers *regs;
147 struct mii_timestamper mii_ts;
148 struct ines_clock *clock;
149 bool rxts_enabled;
150 bool txts_enabled;
151 unsigned int index;
152 struct delayed_work ts_work;
153 /* lock protects event list and tx_skb */
154 spinlock_t lock;
155 struct sk_buff *tx_skb;
156 struct list_head events;
157 struct list_head pool;
158 struct ines_timestamp pool_data[INES_MAX_EVENTS];
159 };
160
161 struct ines_clock {
162 struct ines_port port[INES_N_PORTS];
163 struct ines_global_regs __iomem *regs;
164 void __iomem *base;
165 struct device_node *node;
166 struct device *dev;
167 struct list_head list;
168 };
169
170 static bool ines_match(struct sk_buff *skb, unsigned int ptp_class,
171 struct ines_timestamp *ts, struct device *dev);
172 static int ines_rxfifo_read(struct ines_port *port);
173 static u64 ines_rxts64(struct ines_port *port, unsigned int words);
174 static bool ines_timestamp_expired(struct ines_timestamp *ts);
175 static u64 ines_txts64(struct ines_port *port, unsigned int words);
176 static void ines_txtstamp_work(struct work_struct *work);
177 static bool is_sync_pdelay_resp(struct sk_buff *skb, int type);
178 static u8 tag_to_msgtype(u8 tag);
179
ines_clock_cleanup(struct ines_clock * clock)180 static void ines_clock_cleanup(struct ines_clock *clock)
181 {
182 struct ines_port *port;
183 int i;
184
185 for (i = 0; i < INES_N_PORTS; i++) {
186 port = &clock->port[i];
187 cancel_delayed_work_sync(&port->ts_work);
188 }
189 }
190
ines_clock_init(struct ines_clock * clock,struct device * device,void __iomem * addr)191 static int ines_clock_init(struct ines_clock *clock, struct device *device,
192 void __iomem *addr)
193 {
194 struct device_node *node = device->of_node;
195 unsigned long port_addr;
196 struct ines_port *port;
197 int i, j;
198
199 INIT_LIST_HEAD(&clock->list);
200 clock->node = node;
201 clock->dev = device;
202 clock->base = addr;
203 clock->regs = clock->base;
204
205 for (i = 0; i < INES_N_PORTS; i++) {
206 port = &clock->port[i];
207 port_addr = (unsigned long) clock->base +
208 INES_PORT_OFFSET + i * INES_PORT_SIZE;
209 port->regs = (struct ines_port_registers *) port_addr;
210 port->clock = clock;
211 port->index = i;
212 INIT_DELAYED_WORK(&port->ts_work, ines_txtstamp_work);
213 spin_lock_init(&port->lock);
214 INIT_LIST_HEAD(&port->events);
215 INIT_LIST_HEAD(&port->pool);
216 for (j = 0; j < INES_MAX_EVENTS; j++)
217 list_add(&port->pool_data[j].list, &port->pool);
218 }
219
220 ines_write32(clock, 0xBEEF, test);
221 ines_write32(clock, 0xBEEF, test2);
222
223 dev_dbg(device, "ID 0x%x\n", ines_read32(clock, id));
224 dev_dbg(device, "TEST 0x%x\n", ines_read32(clock, test));
225 dev_dbg(device, "VERSION 0x%x\n", ines_read32(clock, version));
226 dev_dbg(device, "TEST2 0x%x\n", ines_read32(clock, test2));
227
228 for (i = 0; i < INES_N_PORTS; i++) {
229 port = &clock->port[i];
230 ines_write32(port, PORT_CONF, port_conf);
231 }
232
233 return 0;
234 }
235
ines_find_port(struct device_node * node,u32 index)236 static struct ines_port *ines_find_port(struct device_node *node, u32 index)
237 {
238 struct ines_port *port = NULL;
239 struct ines_clock *clock;
240 struct list_head *this;
241
242 mutex_lock(&ines_clocks_lock);
243 list_for_each(this, &ines_clocks) {
244 clock = list_entry(this, struct ines_clock, list);
245 if (clock->node == node) {
246 port = &clock->port[index];
247 break;
248 }
249 }
250 mutex_unlock(&ines_clocks_lock);
251 return port;
252 }
253
ines_find_rxts(struct ines_port * port,struct sk_buff * skb,int type)254 static u64 ines_find_rxts(struct ines_port *port, struct sk_buff *skb, int type)
255 {
256 struct list_head *this, *next;
257 struct ines_timestamp *ts;
258 unsigned long flags;
259 u64 ns = 0;
260
261 if (type == PTP_CLASS_NONE)
262 return 0;
263
264 spin_lock_irqsave(&port->lock, flags);
265 ines_rxfifo_read(port);
266 list_for_each_safe(this, next, &port->events) {
267 ts = list_entry(this, struct ines_timestamp, list);
268 if (ines_timestamp_expired(ts)) {
269 list_del_init(&ts->list);
270 list_add(&ts->list, &port->pool);
271 continue;
272 }
273 if (ines_match(skb, type, ts, port->clock->dev)) {
274 ns = ts->sec * 1000000000ULL + ts->nsec;
275 list_del_init(&ts->list);
276 list_add(&ts->list, &port->pool);
277 break;
278 }
279 }
280 spin_unlock_irqrestore(&port->lock, flags);
281
282 return ns;
283 }
284
ines_find_txts(struct ines_port * port,struct sk_buff * skb)285 static u64 ines_find_txts(struct ines_port *port, struct sk_buff *skb)
286 {
287 unsigned int class = ptp_classify_raw(skb), i;
288 u32 data_rd_pos, buf_stat, mask, ts_stat_tx;
289 struct ines_timestamp ts;
290 unsigned long flags;
291 u64 ns = 0;
292
293 mask = TX_FIFO_NE_1 << port->index;
294
295 spin_lock_irqsave(&port->lock, flags);
296
297 for (i = 0; i < INES_FIFO_DEPTH; i++) {
298
299 buf_stat = ines_read32(port->clock, buf_stat);
300 if (!(buf_stat & mask)) {
301 dev_dbg(port->clock->dev,
302 "Tx timestamp FIFO unexpectedly empty\n");
303 break;
304 }
305 ts_stat_tx = ines_read32(port, ts_stat_tx);
306 data_rd_pos = (ts_stat_tx >> DATA_READ_POS_SHIFT) &
307 DATA_READ_POS_MASK;
308 if (data_rd_pos) {
309 dev_err(port->clock->dev,
310 "unexpected Tx read pos %u\n", data_rd_pos);
311 break;
312 }
313
314 ts.tag = ines_read32(port, ts_tx);
315 ts.sec = ines_txts64(port, 3);
316 ts.nsec = ines_txts64(port, 2);
317 ts.clkid = ines_txts64(port, 4);
318 ts.portnum = ines_read32(port, ts_tx);
319 ts.seqid = ines_read32(port, ts_tx);
320
321 if (ines_match(skb, class, &ts, port->clock->dev)) {
322 ns = ts.sec * 1000000000ULL + ts.nsec;
323 break;
324 }
325 }
326
327 spin_unlock_irqrestore(&port->lock, flags);
328 return ns;
329 }
330
ines_hwtstamp(struct mii_timestamper * mii_ts,struct ifreq * ifr)331 static int ines_hwtstamp(struct mii_timestamper *mii_ts, struct ifreq *ifr)
332 {
333 struct ines_port *port = container_of(mii_ts, struct ines_port, mii_ts);
334 u32 cm_one_step = 0, port_conf, ts_stat_rx, ts_stat_tx;
335 struct hwtstamp_config cfg;
336 unsigned long flags;
337
338 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
339 return -EFAULT;
340
341 /* reserved for future extensions */
342 if (cfg.flags)
343 return -EINVAL;
344
345 switch (cfg.tx_type) {
346 case HWTSTAMP_TX_OFF:
347 ts_stat_tx = 0;
348 break;
349 case HWTSTAMP_TX_ON:
350 ts_stat_tx = TS_ENABLE;
351 break;
352 case HWTSTAMP_TX_ONESTEP_P2P:
353 ts_stat_tx = TS_ENABLE;
354 cm_one_step = CM_ONE_STEP;
355 break;
356 default:
357 return -ERANGE;
358 }
359
360 switch (cfg.rx_filter) {
361 case HWTSTAMP_FILTER_NONE:
362 ts_stat_rx = 0;
363 break;
364 case HWTSTAMP_FILTER_ALL:
365 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
366 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
367 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
368 return -ERANGE;
369 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
370 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
371 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
372 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
373 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
374 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
375 case HWTSTAMP_FILTER_PTP_V2_EVENT:
376 case HWTSTAMP_FILTER_PTP_V2_SYNC:
377 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
378 ts_stat_rx = TS_ENABLE;
379 cfg.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
380 break;
381 default:
382 return -ERANGE;
383 }
384
385 spin_lock_irqsave(&port->lock, flags);
386
387 port_conf = ines_read32(port, port_conf);
388 port_conf &= ~CM_ONE_STEP;
389 port_conf |= cm_one_step;
390
391 ines_write32(port, port_conf, port_conf);
392 ines_write32(port, ts_stat_rx, ts_stat_rx);
393 ines_write32(port, ts_stat_tx, ts_stat_tx);
394
395 port->rxts_enabled = ts_stat_rx == TS_ENABLE;
396 port->txts_enabled = ts_stat_tx == TS_ENABLE;
397
398 spin_unlock_irqrestore(&port->lock, flags);
399
400 return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? -EFAULT : 0;
401 }
402
ines_link_state(struct mii_timestamper * mii_ts,struct phy_device * phydev)403 static void ines_link_state(struct mii_timestamper *mii_ts,
404 struct phy_device *phydev)
405 {
406 struct ines_port *port = container_of(mii_ts, struct ines_port, mii_ts);
407 u32 port_conf, speed_conf;
408 unsigned long flags;
409
410 switch (phydev->speed) {
411 case SPEED_10:
412 speed_conf = PHY_SPEED_10 << PHY_SPEED_SHIFT;
413 break;
414 case SPEED_100:
415 speed_conf = PHY_SPEED_100 << PHY_SPEED_SHIFT;
416 break;
417 case SPEED_1000:
418 speed_conf = PHY_SPEED_1000 << PHY_SPEED_SHIFT;
419 break;
420 default:
421 dev_err(port->clock->dev, "bad speed: %d\n", phydev->speed);
422 return;
423 }
424 spin_lock_irqsave(&port->lock, flags);
425
426 port_conf = ines_read32(port, port_conf);
427 port_conf &= ~(0x3 << PHY_SPEED_SHIFT);
428 port_conf |= speed_conf;
429
430 ines_write32(port, port_conf, port_conf);
431
432 spin_unlock_irqrestore(&port->lock, flags);
433 }
434
ines_match(struct sk_buff * skb,unsigned int ptp_class,struct ines_timestamp * ts,struct device * dev)435 static bool ines_match(struct sk_buff *skb, unsigned int ptp_class,
436 struct ines_timestamp *ts, struct device *dev)
437 {
438 struct ptp_header *hdr;
439 u16 portn, seqid;
440 u8 msgtype;
441 u64 clkid;
442
443 if (unlikely(ptp_class & PTP_CLASS_V1))
444 return false;
445
446 hdr = ptp_parse_header(skb, ptp_class);
447 if (!hdr)
448 return false;
449
450 msgtype = ptp_get_msgtype(hdr, ptp_class);
451 clkid = be64_to_cpup((__be64 *)&hdr->source_port_identity.clock_identity.id[0]);
452 portn = be16_to_cpu(hdr->source_port_identity.port_number);
453 seqid = be16_to_cpu(hdr->sequence_id);
454
455 if (tag_to_msgtype(ts->tag & 0x7) != msgtype) {
456 dev_dbg(dev, "msgtype mismatch ts %hhu != skb %hhu\n",
457 tag_to_msgtype(ts->tag & 0x7), msgtype);
458 return false;
459 }
460 if (ts->clkid != clkid) {
461 dev_dbg(dev, "clkid mismatch ts %llx != skb %llx\n",
462 ts->clkid, clkid);
463 return false;
464 }
465 if (ts->portnum != portn) {
466 dev_dbg(dev, "portn mismatch ts %hu != skb %hu\n",
467 ts->portnum, portn);
468 return false;
469 }
470 if (ts->seqid != seqid) {
471 dev_dbg(dev, "seqid mismatch ts %hu != skb %hu\n",
472 ts->seqid, seqid);
473 return false;
474 }
475
476 return true;
477 }
478
ines_rxtstamp(struct mii_timestamper * mii_ts,struct sk_buff * skb,int type)479 static bool ines_rxtstamp(struct mii_timestamper *mii_ts,
480 struct sk_buff *skb, int type)
481 {
482 struct ines_port *port = container_of(mii_ts, struct ines_port, mii_ts);
483 struct skb_shared_hwtstamps *ssh;
484 u64 ns;
485
486 if (!port->rxts_enabled)
487 return false;
488
489 ns = ines_find_rxts(port, skb, type);
490 if (!ns)
491 return false;
492
493 ssh = skb_hwtstamps(skb);
494 ssh->hwtstamp = ns_to_ktime(ns);
495 netif_rx(skb);
496
497 return true;
498 }
499
ines_rxfifo_read(struct ines_port * port)500 static int ines_rxfifo_read(struct ines_port *port)
501 {
502 u32 data_rd_pos, buf_stat, mask, ts_stat_rx;
503 struct ines_timestamp *ts;
504 unsigned int i;
505
506 mask = RX_FIFO_NE_1 << port->index;
507
508 for (i = 0; i < INES_FIFO_DEPTH; i++) {
509 if (list_empty(&port->pool)) {
510 dev_err(port->clock->dev, "event pool is empty\n");
511 return -1;
512 }
513 buf_stat = ines_read32(port->clock, buf_stat);
514 if (!(buf_stat & mask))
515 break;
516
517 ts_stat_rx = ines_read32(port, ts_stat_rx);
518 data_rd_pos = (ts_stat_rx >> DATA_READ_POS_SHIFT) &
519 DATA_READ_POS_MASK;
520 if (data_rd_pos) {
521 dev_err(port->clock->dev, "unexpected Rx read pos %u\n",
522 data_rd_pos);
523 break;
524 }
525
526 ts = list_first_entry(&port->pool, struct ines_timestamp, list);
527 ts->tmo = jiffies + HZ;
528 ts->tag = ines_read32(port, ts_rx);
529 ts->sec = ines_rxts64(port, 3);
530 ts->nsec = ines_rxts64(port, 2);
531 ts->clkid = ines_rxts64(port, 4);
532 ts->portnum = ines_read32(port, ts_rx);
533 ts->seqid = ines_read32(port, ts_rx);
534
535 list_del_init(&ts->list);
536 list_add_tail(&ts->list, &port->events);
537 }
538
539 return 0;
540 }
541
ines_rxts64(struct ines_port * port,unsigned int words)542 static u64 ines_rxts64(struct ines_port *port, unsigned int words)
543 {
544 unsigned int i;
545 u64 result;
546 u16 word;
547
548 word = ines_read32(port, ts_rx);
549 result = word;
550 words--;
551 for (i = 0; i < words; i++) {
552 word = ines_read32(port, ts_rx);
553 result <<= 16;
554 result |= word;
555 }
556 return result;
557 }
558
ines_timestamp_expired(struct ines_timestamp * ts)559 static bool ines_timestamp_expired(struct ines_timestamp *ts)
560 {
561 return time_after(jiffies, ts->tmo);
562 }
563
ines_ts_info(struct mii_timestamper * mii_ts,struct ethtool_ts_info * info)564 static int ines_ts_info(struct mii_timestamper *mii_ts,
565 struct ethtool_ts_info *info)
566 {
567 info->so_timestamping =
568 SOF_TIMESTAMPING_TX_HARDWARE |
569 SOF_TIMESTAMPING_TX_SOFTWARE |
570 SOF_TIMESTAMPING_RX_HARDWARE |
571 SOF_TIMESTAMPING_RX_SOFTWARE |
572 SOF_TIMESTAMPING_SOFTWARE |
573 SOF_TIMESTAMPING_RAW_HARDWARE;
574
575 info->phc_index = -1;
576
577 info->tx_types =
578 (1 << HWTSTAMP_TX_OFF) |
579 (1 << HWTSTAMP_TX_ON) |
580 (1 << HWTSTAMP_TX_ONESTEP_P2P);
581
582 info->rx_filters =
583 (1 << HWTSTAMP_FILTER_NONE) |
584 (1 << HWTSTAMP_FILTER_PTP_V2_EVENT);
585
586 return 0;
587 }
588
ines_txts64(struct ines_port * port,unsigned int words)589 static u64 ines_txts64(struct ines_port *port, unsigned int words)
590 {
591 unsigned int i;
592 u64 result;
593 u16 word;
594
595 word = ines_read32(port, ts_tx);
596 result = word;
597 words--;
598 for (i = 0; i < words; i++) {
599 word = ines_read32(port, ts_tx);
600 result <<= 16;
601 result |= word;
602 }
603 return result;
604 }
605
ines_txts_onestep(struct ines_port * port,struct sk_buff * skb,int type)606 static bool ines_txts_onestep(struct ines_port *port, struct sk_buff *skb, int type)
607 {
608 unsigned long flags;
609 u32 port_conf;
610
611 spin_lock_irqsave(&port->lock, flags);
612 port_conf = ines_read32(port, port_conf);
613 spin_unlock_irqrestore(&port->lock, flags);
614
615 if (port_conf & CM_ONE_STEP)
616 return is_sync_pdelay_resp(skb, type);
617
618 return false;
619 }
620
ines_txtstamp(struct mii_timestamper * mii_ts,struct sk_buff * skb,int type)621 static void ines_txtstamp(struct mii_timestamper *mii_ts,
622 struct sk_buff *skb, int type)
623 {
624 struct ines_port *port = container_of(mii_ts, struct ines_port, mii_ts);
625 struct sk_buff *old_skb = NULL;
626 unsigned long flags;
627
628 if (!port->txts_enabled || ines_txts_onestep(port, skb, type)) {
629 kfree_skb(skb);
630 return;
631 }
632
633 spin_lock_irqsave(&port->lock, flags);
634
635 if (port->tx_skb)
636 old_skb = port->tx_skb;
637
638 port->tx_skb = skb;
639
640 spin_unlock_irqrestore(&port->lock, flags);
641
642 kfree_skb(old_skb);
643
644 schedule_delayed_work(&port->ts_work, 1);
645 }
646
ines_txtstamp_work(struct work_struct * work)647 static void ines_txtstamp_work(struct work_struct *work)
648 {
649 struct ines_port *port =
650 container_of(work, struct ines_port, ts_work.work);
651 struct skb_shared_hwtstamps ssh;
652 struct sk_buff *skb;
653 unsigned long flags;
654 u64 ns;
655
656 spin_lock_irqsave(&port->lock, flags);
657 skb = port->tx_skb;
658 port->tx_skb = NULL;
659 spin_unlock_irqrestore(&port->lock, flags);
660
661 ns = ines_find_txts(port, skb);
662 if (!ns) {
663 kfree_skb(skb);
664 return;
665 }
666 ssh.hwtstamp = ns_to_ktime(ns);
667 skb_complete_tx_timestamp(skb, &ssh);
668 }
669
is_sync_pdelay_resp(struct sk_buff * skb,int type)670 static bool is_sync_pdelay_resp(struct sk_buff *skb, int type)
671 {
672 struct ptp_header *hdr;
673 u8 msgtype;
674
675 hdr = ptp_parse_header(skb, type);
676 if (!hdr)
677 return false;
678
679 msgtype = ptp_get_msgtype(hdr, type);
680
681 switch (msgtype) {
682 case PTP_MSGTYPE_SYNC:
683 case PTP_MSGTYPE_PDELAY_RESP:
684 return true;
685 default:
686 return false;
687 }
688 }
689
tag_to_msgtype(u8 tag)690 static u8 tag_to_msgtype(u8 tag)
691 {
692 switch (tag) {
693 case MESSAGE_TYPE_SYNC:
694 return PTP_MSGTYPE_SYNC;
695 case MESSAGE_TYPE_P_DELAY_REQ:
696 return PTP_MSGTYPE_PDELAY_REQ;
697 case MESSAGE_TYPE_P_DELAY_RESP:
698 return PTP_MSGTYPE_PDELAY_RESP;
699 case MESSAGE_TYPE_DELAY_REQ:
700 return PTP_MSGTYPE_DELAY_REQ;
701 }
702 return 0xf;
703 }
704
ines_ptp_probe_channel(struct device * device,unsigned int index)705 static struct mii_timestamper *ines_ptp_probe_channel(struct device *device,
706 unsigned int index)
707 {
708 struct device_node *node = device->of_node;
709 struct ines_port *port;
710
711 if (index > INES_N_PORTS - 1) {
712 dev_err(device, "bad port index %u\n", index);
713 return ERR_PTR(-EINVAL);
714 }
715 port = ines_find_port(node, index);
716 if (!port) {
717 dev_err(device, "missing port index %u\n", index);
718 return ERR_PTR(-ENODEV);
719 }
720 port->mii_ts.rxtstamp = ines_rxtstamp;
721 port->mii_ts.txtstamp = ines_txtstamp;
722 port->mii_ts.hwtstamp = ines_hwtstamp;
723 port->mii_ts.link_state = ines_link_state;
724 port->mii_ts.ts_info = ines_ts_info;
725
726 return &port->mii_ts;
727 }
728
ines_ptp_release_channel(struct device * device,struct mii_timestamper * mii_ts)729 static void ines_ptp_release_channel(struct device *device,
730 struct mii_timestamper *mii_ts)
731 {
732 }
733
734 static struct mii_timestamping_ctrl ines_ctrl = {
735 .probe_channel = ines_ptp_probe_channel,
736 .release_channel = ines_ptp_release_channel,
737 };
738
ines_ptp_ctrl_probe(struct platform_device * pld)739 static int ines_ptp_ctrl_probe(struct platform_device *pld)
740 {
741 struct ines_clock *clock;
742 void __iomem *addr;
743 int err = 0;
744
745 addr = devm_platform_ioremap_resource(pld, 0);
746 if (IS_ERR(addr)) {
747 err = PTR_ERR(addr);
748 goto out;
749 }
750 clock = kzalloc(sizeof(*clock), GFP_KERNEL);
751 if (!clock) {
752 err = -ENOMEM;
753 goto out;
754 }
755 if (ines_clock_init(clock, &pld->dev, addr)) {
756 kfree(clock);
757 err = -ENOMEM;
758 goto out;
759 }
760 err = register_mii_tstamp_controller(&pld->dev, &ines_ctrl);
761 if (err) {
762 kfree(clock);
763 goto out;
764 }
765 mutex_lock(&ines_clocks_lock);
766 list_add_tail(&ines_clocks, &clock->list);
767 mutex_unlock(&ines_clocks_lock);
768
769 dev_set_drvdata(&pld->dev, clock);
770 out:
771 return err;
772 }
773
ines_ptp_ctrl_remove(struct platform_device * pld)774 static int ines_ptp_ctrl_remove(struct platform_device *pld)
775 {
776 struct ines_clock *clock = dev_get_drvdata(&pld->dev);
777
778 unregister_mii_tstamp_controller(&pld->dev);
779 mutex_lock(&ines_clocks_lock);
780 list_del(&clock->list);
781 mutex_unlock(&ines_clocks_lock);
782 ines_clock_cleanup(clock);
783 kfree(clock);
784 return 0;
785 }
786
787 static const struct of_device_id ines_ptp_ctrl_of_match[] = {
788 { .compatible = "ines,ptp-ctrl" },
789 { }
790 };
791
792 MODULE_DEVICE_TABLE(of, ines_ptp_ctrl_of_match);
793
794 static struct platform_driver ines_ptp_ctrl_driver = {
795 .probe = ines_ptp_ctrl_probe,
796 .remove = ines_ptp_ctrl_remove,
797 .driver = {
798 .name = "ines_ptp_ctrl",
799 .of_match_table = of_match_ptr(ines_ptp_ctrl_of_match),
800 },
801 };
802 module_platform_driver(ines_ptp_ctrl_driver);
803