1 // SPDX-License-Identifier: GPL-2.0
2 /* Texas Instruments K3 AM65 Ethernet QoS submodule
3  * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
4  *
5  * quality of service module includes:
6  * Enhanced Scheduler Traffic (EST - P802.1Qbv/D2.2)
7  */
8 
9 #include <linux/pm_runtime.h>
10 #include <linux/time.h>
11 
12 #include "am65-cpsw-nuss.h"
13 #include "am65-cpsw-qos.h"
14 #include "am65-cpts.h"
15 
16 #define AM65_CPSW_REG_CTL			0x004
17 #define AM65_CPSW_PN_REG_CTL			0x004
18 #define AM65_CPSW_PN_REG_FIFO_STATUS		0x050
19 #define AM65_CPSW_PN_REG_EST_CTL		0x060
20 
21 /* AM65_CPSW_REG_CTL register fields */
22 #define AM65_CPSW_CTL_EST_EN			BIT(18)
23 
24 /* AM65_CPSW_PN_REG_CTL register fields */
25 #define AM65_CPSW_PN_CTL_EST_PORT_EN		BIT(17)
26 
27 /* AM65_CPSW_PN_REG_EST_CTL register fields */
28 #define AM65_CPSW_PN_EST_ONEBUF			BIT(0)
29 #define AM65_CPSW_PN_EST_BUFSEL			BIT(1)
30 #define AM65_CPSW_PN_EST_TS_EN			BIT(2)
31 #define AM65_CPSW_PN_EST_TS_FIRST		BIT(3)
32 #define AM65_CPSW_PN_EST_ONEPRI			BIT(4)
33 #define AM65_CPSW_PN_EST_TS_PRI_MSK		GENMASK(7, 5)
34 
35 /* AM65_CPSW_PN_REG_FIFO_STATUS register fields */
36 #define AM65_CPSW_PN_FST_TX_PRI_ACTIVE_MSK	GENMASK(7, 0)
37 #define AM65_CPSW_PN_FST_TX_E_MAC_ALLOW_MSK	GENMASK(15, 8)
38 #define AM65_CPSW_PN_FST_EST_CNT_ERR		BIT(16)
39 #define AM65_CPSW_PN_FST_EST_ADD_ERR		BIT(17)
40 #define AM65_CPSW_PN_FST_EST_BUFACT		BIT(18)
41 
42 /* EST FETCH COMMAND RAM */
43 #define AM65_CPSW_FETCH_RAM_CMD_NUM		0x80
44 #define AM65_CPSW_FETCH_CNT_MSK			GENMASK(21, 8)
45 #define AM65_CPSW_FETCH_CNT_MAX			(AM65_CPSW_FETCH_CNT_MSK >> 8)
46 #define AM65_CPSW_FETCH_CNT_OFFSET		8
47 #define AM65_CPSW_FETCH_ALLOW_MSK		GENMASK(7, 0)
48 #define AM65_CPSW_FETCH_ALLOW_MAX		AM65_CPSW_FETCH_ALLOW_MSK
49 
50 enum timer_act {
51 	TACT_PROG,		/* need program timer */
52 	TACT_NEED_STOP,		/* need stop first */
53 	TACT_SKIP_PROG,		/* just buffer can be updated */
54 };
55 
56 static int am65_cpsw_port_est_enabled(struct am65_cpsw_port *port)
57 {
58 	return port->qos.est_oper || port->qos.est_admin;
59 }
60 
61 static void am65_cpsw_est_enable(struct am65_cpsw_common *common, int enable)
62 {
63 	u32 val;
64 
65 	val = readl(common->cpsw_base + AM65_CPSW_REG_CTL);
66 
67 	if (enable)
68 		val |= AM65_CPSW_CTL_EST_EN;
69 	else
70 		val &= ~AM65_CPSW_CTL_EST_EN;
71 
72 	writel(val, common->cpsw_base + AM65_CPSW_REG_CTL);
73 	common->est_enabled = enable;
74 }
75 
76 static void am65_cpsw_port_est_enable(struct am65_cpsw_port *port, int enable)
77 {
78 	u32 val;
79 
80 	val = readl(port->port_base + AM65_CPSW_PN_REG_CTL);
81 	if (enable)
82 		val |= AM65_CPSW_PN_CTL_EST_PORT_EN;
83 	else
84 		val &= ~AM65_CPSW_PN_CTL_EST_PORT_EN;
85 
86 	writel(val, port->port_base + AM65_CPSW_PN_REG_CTL);
87 }
88 
89 /* target new EST RAM buffer, actual toggle happens after cycle completion */
90 static void am65_cpsw_port_est_assign_buf_num(struct net_device *ndev,
91 					      int buf_num)
92 {
93 	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
94 	u32 val;
95 
96 	val = readl(port->port_base + AM65_CPSW_PN_REG_EST_CTL);
97 	if (buf_num)
98 		val |= AM65_CPSW_PN_EST_BUFSEL;
99 	else
100 		val &= ~AM65_CPSW_PN_EST_BUFSEL;
101 
102 	writel(val, port->port_base + AM65_CPSW_PN_REG_EST_CTL);
103 }
104 
105 /* am65_cpsw_port_est_is_swapped() - Indicate if h/w is transitioned
106  * admin -> oper or not
107  *
108  * Return true if already transitioned. i.e oper is equal to admin and buf
109  * numbers match (est_oper->buf match with est_admin->buf).
110  * false if before transition. i.e oper is not equal to admin, (i.e a
111  * previous admin command is waiting to be transitioned to oper state
112  * and est_oper->buf not match with est_oper->buf).
113  */
114 static int am65_cpsw_port_est_is_swapped(struct net_device *ndev, int *oper,
115 					 int *admin)
116 {
117 	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
118 	u32 val;
119 
120 	val = readl(port->port_base + AM65_CPSW_PN_REG_FIFO_STATUS);
121 	*oper = !!(val & AM65_CPSW_PN_FST_EST_BUFACT);
122 
123 	val = readl(port->port_base + AM65_CPSW_PN_REG_EST_CTL);
124 	*admin = !!(val & AM65_CPSW_PN_EST_BUFSEL);
125 
126 	return *admin == *oper;
127 }
128 
129 /* am65_cpsw_port_est_get_free_buf_num() - Get free buffer number for
130  * Admin to program the new schedule.
131  *
132  * Logic as follows:-
133  * If oper is same as admin, return the other buffer (!oper) as the admin
134  * buffer.  If oper is not the same, driver let the current oper to continue
135  * as it is in the process of transitioning from admin -> oper. So keep the
136  * oper by selecting the same oper buffer by writing to EST_BUFSEL bit in
137  * EST CTL register. In the second iteration they will match and code returns.
138  * The actual buffer to write command is selected later before it is ready
139  * to update the schedule.
140  */
141 static int am65_cpsw_port_est_get_free_buf_num(struct net_device *ndev)
142 {
143 	int oper, admin;
144 	int roll = 2;
145 
146 	while (roll--) {
147 		if (am65_cpsw_port_est_is_swapped(ndev, &oper, &admin))
148 			return !oper;
149 
150 		/* admin is not set, so hinder transition as it's not allowed
151 		 * to touch memory in-flight, by targeting same oper buf.
152 		 */
153 		am65_cpsw_port_est_assign_buf_num(ndev, oper);
154 
155 		dev_info(&ndev->dev,
156 			 "Prev. EST admin cycle is in transit %d -> %d\n",
157 			 oper, admin);
158 	}
159 
160 	return admin;
161 }
162 
163 static void am65_cpsw_admin_to_oper(struct net_device *ndev)
164 {
165 	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
166 
167 	if (port->qos.est_oper)
168 		devm_kfree(&ndev->dev, port->qos.est_oper);
169 
170 	port->qos.est_oper = port->qos.est_admin;
171 	port->qos.est_admin = NULL;
172 }
173 
174 static void am65_cpsw_port_est_get_buf_num(struct net_device *ndev,
175 					   struct am65_cpsw_est *est_new)
176 {
177 	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
178 	u32 val;
179 
180 	val = readl(port->port_base + AM65_CPSW_PN_REG_EST_CTL);
181 	val &= ~AM65_CPSW_PN_EST_ONEBUF;
182 	writel(val, port->port_base + AM65_CPSW_PN_REG_EST_CTL);
183 
184 	est_new->buf = am65_cpsw_port_est_get_free_buf_num(ndev);
185 
186 	/* rolled buf num means changed buf while configuring */
187 	if (port->qos.est_oper && port->qos.est_admin &&
188 	    est_new->buf == port->qos.est_oper->buf)
189 		am65_cpsw_admin_to_oper(ndev);
190 }
191 
192 static void am65_cpsw_est_set(struct net_device *ndev, int enable)
193 {
194 	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
195 	struct am65_cpsw_common *common = port->common;
196 	int common_enable = 0;
197 	int i;
198 
199 	am65_cpsw_port_est_enable(port, enable);
200 
201 	for (i = 0; i < common->port_num; i++)
202 		common_enable |= am65_cpsw_port_est_enabled(&common->ports[i]);
203 
204 	common_enable |= enable;
205 	am65_cpsw_est_enable(common, common_enable);
206 }
207 
208 /* This update is supposed to be used in any routine before getting real state
209  * of admin -> oper transition, particularly it's supposed to be used in some
210  * generic routine for providing real state to Taprio Qdisc.
211  */
212 static void am65_cpsw_est_update_state(struct net_device *ndev)
213 {
214 	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
215 	int oper, admin;
216 
217 	if (!port->qos.est_admin)
218 		return;
219 
220 	if (!am65_cpsw_port_est_is_swapped(ndev, &oper, &admin))
221 		return;
222 
223 	am65_cpsw_admin_to_oper(ndev);
224 }
225 
226 /* Fetch command count it's number of bytes in Gigabit mode or nibbles in
227  * 10/100Mb mode. So, having speed and time in ns, recalculate ns to number of
228  * bytes/nibbles that can be sent while transmission on given speed.
229  */
230 static int am65_est_cmd_ns_to_cnt(u64 ns, int link_speed)
231 {
232 	u64 temp;
233 
234 	temp = ns * link_speed;
235 	if (link_speed < SPEED_1000)
236 		temp <<= 1;
237 
238 	return DIV_ROUND_UP(temp, 8 * 1000);
239 }
240 
241 static void __iomem *am65_cpsw_est_set_sched_cmds(void __iomem *addr,
242 						  int fetch_cnt,
243 						  int fetch_allow)
244 {
245 	u32 prio_mask, cmd_fetch_cnt, cmd;
246 
247 	do {
248 		if (fetch_cnt > AM65_CPSW_FETCH_CNT_MAX) {
249 			fetch_cnt -= AM65_CPSW_FETCH_CNT_MAX;
250 			cmd_fetch_cnt = AM65_CPSW_FETCH_CNT_MAX;
251 		} else {
252 			cmd_fetch_cnt = fetch_cnt;
253 			/* fetch count can't be less than 16? */
254 			if (cmd_fetch_cnt && cmd_fetch_cnt < 16)
255 				cmd_fetch_cnt = 16;
256 
257 			fetch_cnt = 0;
258 		}
259 
260 		prio_mask = fetch_allow & AM65_CPSW_FETCH_ALLOW_MSK;
261 		cmd = (cmd_fetch_cnt << AM65_CPSW_FETCH_CNT_OFFSET) | prio_mask;
262 
263 		writel(cmd, addr);
264 		addr += 4;
265 	} while (fetch_cnt);
266 
267 	return addr;
268 }
269 
270 static int am65_cpsw_est_calc_cmd_num(struct net_device *ndev,
271 				      struct tc_taprio_qopt_offload *taprio,
272 				      int link_speed)
273 {
274 	int i, cmd_cnt, cmd_sum = 0;
275 	u32 fetch_cnt;
276 
277 	for (i = 0; i < taprio->num_entries; i++) {
278 		if (taprio->entries[i].command != TC_TAPRIO_CMD_SET_GATES) {
279 			dev_err(&ndev->dev, "Only SET command is supported");
280 			return -EINVAL;
281 		}
282 
283 		fetch_cnt = am65_est_cmd_ns_to_cnt(taprio->entries[i].interval,
284 						   link_speed);
285 
286 		cmd_cnt = DIV_ROUND_UP(fetch_cnt, AM65_CPSW_FETCH_CNT_MAX);
287 		if (!cmd_cnt)
288 			cmd_cnt++;
289 
290 		cmd_sum += cmd_cnt;
291 
292 		if (!fetch_cnt)
293 			break;
294 	}
295 
296 	return cmd_sum;
297 }
298 
299 static int am65_cpsw_est_check_scheds(struct net_device *ndev,
300 				      struct am65_cpsw_est *est_new)
301 {
302 	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
303 	int cmd_num;
304 
305 	cmd_num = am65_cpsw_est_calc_cmd_num(ndev, &est_new->taprio,
306 					     port->qos.link_speed);
307 	if (cmd_num < 0)
308 		return cmd_num;
309 
310 	if (cmd_num > AM65_CPSW_FETCH_RAM_CMD_NUM / 2) {
311 		dev_err(&ndev->dev, "No fetch RAM");
312 		return -ENOMEM;
313 	}
314 
315 	return 0;
316 }
317 
318 static void am65_cpsw_est_set_sched_list(struct net_device *ndev,
319 					 struct am65_cpsw_est *est_new)
320 {
321 	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
322 	u32 fetch_cnt, fetch_allow, all_fetch_allow = 0;
323 	void __iomem *ram_addr, *max_ram_addr;
324 	struct tc_taprio_sched_entry *entry;
325 	int i, ram_size;
326 
327 	ram_addr = port->fetch_ram_base;
328 	ram_size = AM65_CPSW_FETCH_RAM_CMD_NUM * 2;
329 	ram_addr += est_new->buf * ram_size;
330 
331 	max_ram_addr = ram_size + ram_addr;
332 	for (i = 0; i < est_new->taprio.num_entries; i++) {
333 		entry = &est_new->taprio.entries[i];
334 
335 		fetch_cnt = am65_est_cmd_ns_to_cnt(entry->interval,
336 						   port->qos.link_speed);
337 		fetch_allow = entry->gate_mask;
338 		if (fetch_allow > AM65_CPSW_FETCH_ALLOW_MAX)
339 			dev_dbg(&ndev->dev, "fetch_allow > 8 bits: %d\n",
340 				fetch_allow);
341 
342 		ram_addr = am65_cpsw_est_set_sched_cmds(ram_addr, fetch_cnt,
343 							fetch_allow);
344 
345 		if (!fetch_cnt && i < est_new->taprio.num_entries - 1) {
346 			dev_info(&ndev->dev,
347 				 "next scheds after %d have no impact", i + 1);
348 			break;
349 		}
350 
351 		all_fetch_allow |= fetch_allow;
352 	}
353 
354 	/* end cmd, enabling non-timed queues for potential over cycle time */
355 	if (ram_addr < max_ram_addr)
356 		writel(~all_fetch_allow & AM65_CPSW_FETCH_ALLOW_MSK, ram_addr);
357 }
358 
359 /**
360  * Enable ESTf periodic output, set cycle start time and interval.
361  */
362 static int am65_cpsw_timer_set(struct net_device *ndev,
363 			       struct am65_cpsw_est *est_new)
364 {
365 	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
366 	struct am65_cpsw_common *common = port->common;
367 	struct am65_cpts *cpts = common->cpts;
368 	struct am65_cpts_estf_cfg cfg;
369 
370 	cfg.ns_period = est_new->taprio.cycle_time;
371 	cfg.ns_start = est_new->taprio.base_time;
372 
373 	return am65_cpts_estf_enable(cpts, port->port_id - 1, &cfg);
374 }
375 
376 static void am65_cpsw_timer_stop(struct net_device *ndev)
377 {
378 	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
379 	struct am65_cpts *cpts = port->common->cpts;
380 
381 	am65_cpts_estf_disable(cpts, port->port_id - 1);
382 }
383 
384 static enum timer_act am65_cpsw_timer_act(struct net_device *ndev,
385 					  struct am65_cpsw_est *est_new)
386 {
387 	struct tc_taprio_qopt_offload *taprio_oper, *taprio_new;
388 	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
389 	struct am65_cpts *cpts = port->common->cpts;
390 	u64 cur_time;
391 	s64 diff;
392 
393 	if (!port->qos.est_oper)
394 		return TACT_PROG;
395 
396 	taprio_new = &est_new->taprio;
397 	taprio_oper = &port->qos.est_oper->taprio;
398 
399 	if (taprio_new->cycle_time != taprio_oper->cycle_time)
400 		return TACT_NEED_STOP;
401 
402 	/* in order to avoid timer reset get base_time form oper taprio */
403 	if (!taprio_new->base_time && taprio_oper)
404 		taprio_new->base_time = taprio_oper->base_time;
405 
406 	if (taprio_new->base_time == taprio_oper->base_time)
407 		return TACT_SKIP_PROG;
408 
409 	/* base times are cycle synchronized */
410 	diff = taprio_new->base_time - taprio_oper->base_time;
411 	diff = diff < 0 ? -diff : diff;
412 	if (diff % taprio_new->cycle_time)
413 		return TACT_NEED_STOP;
414 
415 	cur_time = am65_cpts_ns_gettime(cpts);
416 	if (taprio_new->base_time <= cur_time + taprio_new->cycle_time)
417 		return TACT_SKIP_PROG;
418 
419 	/* TODO: Admin schedule at future time is not currently supported */
420 	return TACT_NEED_STOP;
421 }
422 
423 static void am65_cpsw_stop_est(struct net_device *ndev)
424 {
425 	am65_cpsw_est_set(ndev, 0);
426 	am65_cpsw_timer_stop(ndev);
427 }
428 
429 static void am65_cpsw_purge_est(struct net_device *ndev)
430 {
431 	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
432 
433 	am65_cpsw_stop_est(ndev);
434 
435 	if (port->qos.est_admin)
436 		devm_kfree(&ndev->dev, port->qos.est_admin);
437 
438 	if (port->qos.est_oper)
439 		devm_kfree(&ndev->dev, port->qos.est_oper);
440 
441 	port->qos.est_oper = NULL;
442 	port->qos.est_admin = NULL;
443 }
444 
445 static int am65_cpsw_configure_taprio(struct net_device *ndev,
446 				      struct am65_cpsw_est *est_new)
447 {
448 	struct am65_cpsw_common *common = am65_ndev_to_common(ndev);
449 	struct am65_cpts *cpts = common->cpts;
450 	int ret = 0, tact = TACT_PROG;
451 
452 	am65_cpsw_est_update_state(ndev);
453 
454 	if (!est_new->taprio.enable) {
455 		am65_cpsw_stop_est(ndev);
456 		return ret;
457 	}
458 
459 	ret = am65_cpsw_est_check_scheds(ndev, est_new);
460 	if (ret < 0)
461 		return ret;
462 
463 	tact = am65_cpsw_timer_act(ndev, est_new);
464 	if (tact == TACT_NEED_STOP) {
465 		dev_err(&ndev->dev,
466 			"Can't toggle estf timer, stop taprio first");
467 		return -EINVAL;
468 	}
469 
470 	if (tact == TACT_PROG)
471 		am65_cpsw_timer_stop(ndev);
472 
473 	if (!est_new->taprio.base_time)
474 		est_new->taprio.base_time = am65_cpts_ns_gettime(cpts);
475 
476 	am65_cpsw_port_est_get_buf_num(ndev, est_new);
477 	am65_cpsw_est_set_sched_list(ndev, est_new);
478 	am65_cpsw_port_est_assign_buf_num(ndev, est_new->buf);
479 
480 	am65_cpsw_est_set(ndev, est_new->taprio.enable);
481 
482 	if (tact == TACT_PROG) {
483 		ret = am65_cpsw_timer_set(ndev, est_new);
484 		if (ret) {
485 			dev_err(&ndev->dev, "Failed to set cycle time");
486 			return ret;
487 		}
488 	}
489 
490 	return ret;
491 }
492 
493 static void am65_cpsw_cp_taprio(struct tc_taprio_qopt_offload *from,
494 				struct tc_taprio_qopt_offload *to)
495 {
496 	int i;
497 
498 	*to = *from;
499 	for (i = 0; i < from->num_entries; i++)
500 		to->entries[i] = from->entries[i];
501 }
502 
503 static int am65_cpsw_set_taprio(struct net_device *ndev, void *type_data)
504 {
505 	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
506 	struct tc_taprio_qopt_offload *taprio = type_data;
507 	struct am65_cpsw_est *est_new;
508 	int ret = 0;
509 
510 	if (taprio->cycle_time_extension) {
511 		dev_err(&ndev->dev, "Failed to set cycle time extension");
512 		return -EOPNOTSUPP;
513 	}
514 
515 	est_new = devm_kzalloc(&ndev->dev,
516 			       struct_size(est_new, taprio.entries, taprio->num_entries),
517 			       GFP_KERNEL);
518 	if (!est_new)
519 		return -ENOMEM;
520 
521 	am65_cpsw_cp_taprio(taprio, &est_new->taprio);
522 	ret = am65_cpsw_configure_taprio(ndev, est_new);
523 	if (!ret) {
524 		if (taprio->enable) {
525 			if (port->qos.est_admin)
526 				devm_kfree(&ndev->dev, port->qos.est_admin);
527 
528 			port->qos.est_admin = est_new;
529 		} else {
530 			devm_kfree(&ndev->dev, est_new);
531 			am65_cpsw_purge_est(ndev);
532 		}
533 	} else {
534 		devm_kfree(&ndev->dev, est_new);
535 	}
536 
537 	return ret;
538 }
539 
540 static void am65_cpsw_est_link_up(struct net_device *ndev, int link_speed)
541 {
542 	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
543 	ktime_t cur_time;
544 	s64 delta;
545 
546 	port->qos.link_speed = link_speed;
547 	if (!am65_cpsw_port_est_enabled(port))
548 		return;
549 
550 	if (port->qos.link_down_time) {
551 		cur_time = ktime_get();
552 		delta = ktime_us_delta(cur_time, port->qos.link_down_time);
553 		if (delta > USEC_PER_SEC) {
554 			dev_err(&ndev->dev,
555 				"Link has been lost too long, stopping TAS");
556 			goto purge_est;
557 		}
558 	}
559 
560 	return;
561 
562 purge_est:
563 	am65_cpsw_purge_est(ndev);
564 }
565 
566 static int am65_cpsw_setup_taprio(struct net_device *ndev, void *type_data)
567 {
568 	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
569 	struct am65_cpsw_common *common = port->common;
570 
571 	if (!IS_ENABLED(CONFIG_TI_AM65_CPSW_TAS))
572 		return -ENODEV;
573 
574 	if (!netif_running(ndev)) {
575 		dev_err(&ndev->dev, "interface is down, link speed unknown\n");
576 		return -ENETDOWN;
577 	}
578 
579 	if (common->pf_p0_rx_ptype_rrobin) {
580 		dev_err(&ndev->dev,
581 			"p0-rx-ptype-rrobin flag conflicts with taprio qdisc\n");
582 		return -EINVAL;
583 	}
584 
585 	if (port->qos.link_speed == SPEED_UNKNOWN)
586 		return -ENOLINK;
587 
588 	return am65_cpsw_set_taprio(ndev, type_data);
589 }
590 
591 int am65_cpsw_qos_ndo_setup_tc(struct net_device *ndev, enum tc_setup_type type,
592 			       void *type_data)
593 {
594 	switch (type) {
595 	case TC_SETUP_QDISC_TAPRIO:
596 		return am65_cpsw_setup_taprio(ndev, type_data);
597 	default:
598 		return -EOPNOTSUPP;
599 	}
600 }
601 
602 void am65_cpsw_qos_link_up(struct net_device *ndev, int link_speed)
603 {
604 	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
605 
606 	if (!IS_ENABLED(CONFIG_TI_AM65_CPSW_TAS))
607 		return;
608 
609 	am65_cpsw_est_link_up(ndev, link_speed);
610 	port->qos.link_down_time = 0;
611 }
612 
613 void am65_cpsw_qos_link_down(struct net_device *ndev)
614 {
615 	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
616 
617 	if (!IS_ENABLED(CONFIG_TI_AM65_CPSW_TAS))
618 		return;
619 
620 	if (!port->qos.link_down_time)
621 		port->qos.link_down_time = ktime_get();
622 
623 	port->qos.link_speed = SPEED_UNKNOWN;
624 }
625