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1 // SPDX-License-Identifier: GPL-2.0+
2 /* Framework for configuring and reading PHY devices
3  * Based on code in sungem_phy.c and gianfar_phy.c
4  *
5  * Author: Andy Fleming
6  *
7  * Copyright (c) 2004 Freescale Semiconductor, Inc.
8  * Copyright (c) 2006, 2007  Maciej W. Rozycki
9  */
10 
11 #include <linux/kernel.h>
12 #include <linux/string.h>
13 #include <linux/errno.h>
14 #include <linux/unistd.h>
15 #include <linux/interrupt.h>
16 #include <linux/delay.h>
17 #include <linux/netdevice.h>
18 #include <linux/netlink.h>
19 #include <linux/etherdevice.h>
20 #include <linux/skbuff.h>
21 #include <linux/mm.h>
22 #include <linux/module.h>
23 #include <linux/mii.h>
24 #include <linux/ethtool.h>
25 #include <linux/ethtool_netlink.h>
26 #include <linux/phy.h>
27 #include <linux/phy_led_triggers.h>
28 #include <linux/sfp.h>
29 #include <linux/workqueue.h>
30 #include <linux/mdio.h>
31 #include <linux/io.h>
32 #include <linux/uaccess.h>
33 #include <linux/atomic.h>
34 #include <net/netlink.h>
35 #include <net/genetlink.h>
36 #include <net/sock.h>
37 
38 #define PHY_STATE_TIME	HZ
39 
40 #define PHY_STATE_STR(_state)			\
41 	case PHY_##_state:			\
42 		return __stringify(_state);	\
43 
phy_state_to_str(enum phy_state st)44 static const char *phy_state_to_str(enum phy_state st)
45 {
46 	switch (st) {
47 	PHY_STATE_STR(DOWN)
48 	PHY_STATE_STR(READY)
49 	PHY_STATE_STR(UP)
50 	PHY_STATE_STR(RUNNING)
51 	PHY_STATE_STR(NOLINK)
52 	PHY_STATE_STR(CABLETEST)
53 	PHY_STATE_STR(HALTED)
54 	}
55 
56 	return NULL;
57 }
58 
phy_link_up(struct phy_device * phydev)59 static void phy_link_up(struct phy_device *phydev)
60 {
61 	phydev->phy_link_change(phydev, true);
62 	phy_led_trigger_change_speed(phydev);
63 }
64 
phy_link_down(struct phy_device * phydev)65 static void phy_link_down(struct phy_device *phydev)
66 {
67 	phydev->phy_link_change(phydev, false);
68 	phy_led_trigger_change_speed(phydev);
69 }
70 
phy_pause_str(struct phy_device * phydev)71 static const char *phy_pause_str(struct phy_device *phydev)
72 {
73 	bool local_pause, local_asym_pause;
74 
75 	if (phydev->autoneg == AUTONEG_DISABLE)
76 		goto no_pause;
77 
78 	local_pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
79 					phydev->advertising);
80 	local_asym_pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
81 					     phydev->advertising);
82 
83 	if (local_pause && phydev->pause)
84 		return "rx/tx";
85 
86 	if (local_asym_pause && phydev->asym_pause) {
87 		if (local_pause)
88 			return "rx";
89 		if (phydev->pause)
90 			return "tx";
91 	}
92 
93 no_pause:
94 	return "off";
95 }
96 
97 /**
98  * phy_print_status - Convenience function to print out the current phy status
99  * @phydev: the phy_device struct
100  */
phy_print_status(struct phy_device * phydev)101 void phy_print_status(struct phy_device *phydev)
102 {
103 	if (phydev->link) {
104 		netdev_info(phydev->attached_dev,
105 			"Link is Up - %s/%s %s- flow control %s\n",
106 			phy_speed_to_str(phydev->speed),
107 			phy_duplex_to_str(phydev->duplex),
108 			phydev->downshifted_rate ? "(downshifted) " : "",
109 			phy_pause_str(phydev));
110 	} else	{
111 		netdev_info(phydev->attached_dev, "Link is Down\n");
112 	}
113 }
114 EXPORT_SYMBOL(phy_print_status);
115 
116 /**
117  * phy_clear_interrupt - Ack the phy device's interrupt
118  * @phydev: the phy_device struct
119  *
120  * If the @phydev driver has an ack_interrupt function, call it to
121  * ack and clear the phy device's interrupt.
122  *
123  * Returns 0 on success or < 0 on error.
124  */
phy_clear_interrupt(struct phy_device * phydev)125 static int phy_clear_interrupt(struct phy_device *phydev)
126 {
127 	if (phydev->drv->ack_interrupt)
128 		return phydev->drv->ack_interrupt(phydev);
129 
130 	return 0;
131 }
132 
133 /**
134  * phy_config_interrupt - configure the PHY device for the requested interrupts
135  * @phydev: the phy_device struct
136  * @interrupts: interrupt flags to configure for this @phydev
137  *
138  * Returns 0 on success or < 0 on error.
139  */
phy_config_interrupt(struct phy_device * phydev,bool interrupts)140 static int phy_config_interrupt(struct phy_device *phydev, bool interrupts)
141 {
142 	phydev->interrupts = interrupts ? 1 : 0;
143 	if (phydev->drv->config_intr)
144 		return phydev->drv->config_intr(phydev);
145 
146 	return 0;
147 }
148 
149 /**
150  * phy_restart_aneg - restart auto-negotiation
151  * @phydev: target phy_device struct
152  *
153  * Restart the autonegotiation on @phydev.  Returns >= 0 on success or
154  * negative errno on error.
155  */
phy_restart_aneg(struct phy_device * phydev)156 int phy_restart_aneg(struct phy_device *phydev)
157 {
158 	int ret;
159 
160 	if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
161 		ret = genphy_c45_restart_aneg(phydev);
162 	else
163 		ret = genphy_restart_aneg(phydev);
164 
165 	return ret;
166 }
167 EXPORT_SYMBOL_GPL(phy_restart_aneg);
168 
169 /**
170  * phy_aneg_done - return auto-negotiation status
171  * @phydev: target phy_device struct
172  *
173  * Description: Return the auto-negotiation status from this @phydev
174  * Returns > 0 on success or < 0 on error. 0 means that auto-negotiation
175  * is still pending.
176  */
phy_aneg_done(struct phy_device * phydev)177 int phy_aneg_done(struct phy_device *phydev)
178 {
179 	if (phydev->drv && phydev->drv->aneg_done)
180 		return phydev->drv->aneg_done(phydev);
181 	else if (phydev->is_c45)
182 		return genphy_c45_aneg_done(phydev);
183 	else
184 		return genphy_aneg_done(phydev);
185 }
186 EXPORT_SYMBOL(phy_aneg_done);
187 
188 /**
189  * phy_find_valid - find a PHY setting that matches the requested parameters
190  * @speed: desired speed
191  * @duplex: desired duplex
192  * @supported: mask of supported link modes
193  *
194  * Locate a supported phy setting that is, in priority order:
195  * - an exact match for the specified speed and duplex mode
196  * - a match for the specified speed, or slower speed
197  * - the slowest supported speed
198  * Returns the matched phy_setting entry, or %NULL if no supported phy
199  * settings were found.
200  */
201 static const struct phy_setting *
phy_find_valid(int speed,int duplex,unsigned long * supported)202 phy_find_valid(int speed, int duplex, unsigned long *supported)
203 {
204 	return phy_lookup_setting(speed, duplex, supported, false);
205 }
206 
207 /**
208  * phy_supported_speeds - return all speeds currently supported by a phy device
209  * @phy: The phy device to return supported speeds of.
210  * @speeds: buffer to store supported speeds in.
211  * @size:   size of speeds buffer.
212  *
213  * Description: Returns the number of supported speeds, and fills the speeds
214  * buffer with the supported speeds. If speeds buffer is too small to contain
215  * all currently supported speeds, will return as many speeds as can fit.
216  */
phy_supported_speeds(struct phy_device * phy,unsigned int * speeds,unsigned int size)217 unsigned int phy_supported_speeds(struct phy_device *phy,
218 				  unsigned int *speeds,
219 				  unsigned int size)
220 {
221 	return phy_speeds(speeds, size, phy->supported);
222 }
223 
224 /**
225  * phy_check_valid - check if there is a valid PHY setting which matches
226  *		     speed, duplex, and feature mask
227  * @speed: speed to match
228  * @duplex: duplex to match
229  * @features: A mask of the valid settings
230  *
231  * Description: Returns true if there is a valid setting, false otherwise.
232  */
phy_check_valid(int speed,int duplex,unsigned long * features)233 static inline bool phy_check_valid(int speed, int duplex,
234 				   unsigned long *features)
235 {
236 	return !!phy_lookup_setting(speed, duplex, features, true);
237 }
238 
239 /**
240  * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
241  * @phydev: the target phy_device struct
242  *
243  * Description: Make sure the PHY is set to supported speeds and
244  *   duplexes.  Drop down by one in this order:  1000/FULL,
245  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
246  */
phy_sanitize_settings(struct phy_device * phydev)247 static void phy_sanitize_settings(struct phy_device *phydev)
248 {
249 	const struct phy_setting *setting;
250 
251 	setting = phy_find_valid(phydev->speed, phydev->duplex,
252 				 phydev->supported);
253 	if (setting) {
254 		phydev->speed = setting->speed;
255 		phydev->duplex = setting->duplex;
256 	} else {
257 		/* We failed to find anything (no supported speeds?) */
258 		phydev->speed = SPEED_UNKNOWN;
259 		phydev->duplex = DUPLEX_UNKNOWN;
260 	}
261 }
262 
phy_ethtool_ksettings_get(struct phy_device * phydev,struct ethtool_link_ksettings * cmd)263 void phy_ethtool_ksettings_get(struct phy_device *phydev,
264 			       struct ethtool_link_ksettings *cmd)
265 {
266 	mutex_lock(&phydev->lock);
267 	linkmode_copy(cmd->link_modes.supported, phydev->supported);
268 	linkmode_copy(cmd->link_modes.advertising, phydev->advertising);
269 	linkmode_copy(cmd->link_modes.lp_advertising, phydev->lp_advertising);
270 
271 	cmd->base.speed = phydev->speed;
272 	cmd->base.duplex = phydev->duplex;
273 	cmd->base.master_slave_cfg = phydev->master_slave_get;
274 	cmd->base.master_slave_state = phydev->master_slave_state;
275 	if (phydev->interface == PHY_INTERFACE_MODE_MOCA)
276 		cmd->base.port = PORT_BNC;
277 	else
278 		cmd->base.port = phydev->port;
279 	cmd->base.transceiver = phy_is_internal(phydev) ?
280 				XCVR_INTERNAL : XCVR_EXTERNAL;
281 	cmd->base.phy_address = phydev->mdio.addr;
282 	cmd->base.autoneg = phydev->autoneg;
283 	cmd->base.eth_tp_mdix_ctrl = phydev->mdix_ctrl;
284 	cmd->base.eth_tp_mdix = phydev->mdix;
285 	mutex_unlock(&phydev->lock);
286 }
287 EXPORT_SYMBOL(phy_ethtool_ksettings_get);
288 
289 /**
290  * phy_mii_ioctl - generic PHY MII ioctl interface
291  * @phydev: the phy_device struct
292  * @ifr: &struct ifreq for socket ioctl's
293  * @cmd: ioctl cmd to execute
294  *
295  * Note that this function is currently incompatible with the
296  * PHYCONTROL layer.  It changes registers without regard to
297  * current state.  Use at own risk.
298  */
phy_mii_ioctl(struct phy_device * phydev,struct ifreq * ifr,int cmd)299 int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
300 {
301 	struct mii_ioctl_data *mii_data = if_mii(ifr);
302 	u16 val = mii_data->val_in;
303 	bool change_autoneg = false;
304 	int prtad, devad;
305 
306 	switch (cmd) {
307 	case SIOCGMIIPHY:
308 		mii_data->phy_id = phydev->mdio.addr;
309 		fallthrough;
310 
311 	case SIOCGMIIREG:
312 		if (mdio_phy_id_is_c45(mii_data->phy_id)) {
313 			prtad = mdio_phy_id_prtad(mii_data->phy_id);
314 			devad = mdio_phy_id_devad(mii_data->phy_id);
315 			devad = mdiobus_c45_addr(devad, mii_data->reg_num);
316 		} else {
317 			prtad = mii_data->phy_id;
318 			devad = mii_data->reg_num;
319 		}
320 		mii_data->val_out = mdiobus_read(phydev->mdio.bus, prtad,
321 						 devad);
322 		return 0;
323 
324 	case SIOCSMIIREG:
325 		if (mdio_phy_id_is_c45(mii_data->phy_id)) {
326 			prtad = mdio_phy_id_prtad(mii_data->phy_id);
327 			devad = mdio_phy_id_devad(mii_data->phy_id);
328 			devad = mdiobus_c45_addr(devad, mii_data->reg_num);
329 		} else {
330 			prtad = mii_data->phy_id;
331 			devad = mii_data->reg_num;
332 		}
333 		if (prtad == phydev->mdio.addr) {
334 			switch (devad) {
335 			case MII_BMCR:
336 				if ((val & (BMCR_RESET | BMCR_ANENABLE)) == 0) {
337 					if (phydev->autoneg == AUTONEG_ENABLE)
338 						change_autoneg = true;
339 					phydev->autoneg = AUTONEG_DISABLE;
340 					if (val & BMCR_FULLDPLX)
341 						phydev->duplex = DUPLEX_FULL;
342 					else
343 						phydev->duplex = DUPLEX_HALF;
344 					if (val & BMCR_SPEED1000)
345 						phydev->speed = SPEED_1000;
346 					else if (val & BMCR_SPEED100)
347 						phydev->speed = SPEED_100;
348 					else phydev->speed = SPEED_10;
349 				}
350 				else {
351 					if (phydev->autoneg == AUTONEG_DISABLE)
352 						change_autoneg = true;
353 					phydev->autoneg = AUTONEG_ENABLE;
354 				}
355 				break;
356 			case MII_ADVERTISE:
357 				mii_adv_mod_linkmode_adv_t(phydev->advertising,
358 							   val);
359 				change_autoneg = true;
360 				break;
361 			case MII_CTRL1000:
362 				mii_ctrl1000_mod_linkmode_adv_t(phydev->advertising,
363 							        val);
364 				change_autoneg = true;
365 				break;
366 			default:
367 				/* do nothing */
368 				break;
369 			}
370 		}
371 
372 		mdiobus_write(phydev->mdio.bus, prtad, devad, val);
373 
374 		if (prtad == phydev->mdio.addr &&
375 		    devad == MII_BMCR &&
376 		    val & BMCR_RESET)
377 			return phy_init_hw(phydev);
378 
379 		if (change_autoneg)
380 			return phy_start_aneg(phydev);
381 
382 		return 0;
383 
384 	case SIOCSHWTSTAMP:
385 		if (phydev->mii_ts && phydev->mii_ts->hwtstamp)
386 			return phydev->mii_ts->hwtstamp(phydev->mii_ts, ifr);
387 		fallthrough;
388 
389 	default:
390 		return -EOPNOTSUPP;
391 	}
392 }
393 EXPORT_SYMBOL(phy_mii_ioctl);
394 
395 /**
396  * phy_do_ioctl - generic ndo_do_ioctl implementation
397  * @dev: the net_device struct
398  * @ifr: &struct ifreq for socket ioctl's
399  * @cmd: ioctl cmd to execute
400  */
phy_do_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)401 int phy_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
402 {
403 	if (!dev->phydev)
404 		return -ENODEV;
405 
406 	return phy_mii_ioctl(dev->phydev, ifr, cmd);
407 }
408 EXPORT_SYMBOL(phy_do_ioctl);
409 
410 /**
411  * phy_do_ioctl_running - generic ndo_do_ioctl implementation but test first
412  *
413  * @dev: the net_device struct
414  * @ifr: &struct ifreq for socket ioctl's
415  * @cmd: ioctl cmd to execute
416  *
417  * Same as phy_do_ioctl, but ensures that net_device is running before
418  * handling the ioctl.
419  */
phy_do_ioctl_running(struct net_device * dev,struct ifreq * ifr,int cmd)420 int phy_do_ioctl_running(struct net_device *dev, struct ifreq *ifr, int cmd)
421 {
422 	if (!netif_running(dev))
423 		return -ENODEV;
424 
425 	return phy_do_ioctl(dev, ifr, cmd);
426 }
427 EXPORT_SYMBOL(phy_do_ioctl_running);
428 
429 /**
430  * phy_queue_state_machine - Trigger the state machine to run soon
431  *
432  * @phydev: the phy_device struct
433  * @jiffies: Run the state machine after these jiffies
434  */
phy_queue_state_machine(struct phy_device * phydev,unsigned long jiffies)435 void phy_queue_state_machine(struct phy_device *phydev, unsigned long jiffies)
436 {
437 	mod_delayed_work(system_power_efficient_wq, &phydev->state_queue,
438 			 jiffies);
439 }
440 EXPORT_SYMBOL(phy_queue_state_machine);
441 
442 /**
443  * phy_queue_state_machine - Trigger the state machine to run now
444  *
445  * @phydev: the phy_device struct
446  */
phy_trigger_machine(struct phy_device * phydev)447 static void phy_trigger_machine(struct phy_device *phydev)
448 {
449 	phy_queue_state_machine(phydev, 0);
450 }
451 
phy_abort_cable_test(struct phy_device * phydev)452 static void phy_abort_cable_test(struct phy_device *phydev)
453 {
454 	int err;
455 
456 	ethnl_cable_test_finished(phydev);
457 
458 	err = phy_init_hw(phydev);
459 	if (err)
460 		phydev_err(phydev, "Error while aborting cable test");
461 }
462 
463 /**
464  * phy_ethtool_get_strings - Get the statistic counter names
465  *
466  * @phydev: the phy_device struct
467  * @data: Where to put the strings
468  */
phy_ethtool_get_strings(struct phy_device * phydev,u8 * data)469 int phy_ethtool_get_strings(struct phy_device *phydev, u8 *data)
470 {
471 	if (!phydev->drv)
472 		return -EIO;
473 
474 	mutex_lock(&phydev->lock);
475 	phydev->drv->get_strings(phydev, data);
476 	mutex_unlock(&phydev->lock);
477 
478 	return 0;
479 }
480 EXPORT_SYMBOL(phy_ethtool_get_strings);
481 
482 /**
483  * phy_ethtool_get_sset_count - Get the number of statistic counters
484  *
485  * @phydev: the phy_device struct
486  */
phy_ethtool_get_sset_count(struct phy_device * phydev)487 int phy_ethtool_get_sset_count(struct phy_device *phydev)
488 {
489 	int ret;
490 
491 	if (!phydev->drv)
492 		return -EIO;
493 
494 	if (phydev->drv->get_sset_count &&
495 	    phydev->drv->get_strings &&
496 	    phydev->drv->get_stats) {
497 		mutex_lock(&phydev->lock);
498 		ret = phydev->drv->get_sset_count(phydev);
499 		mutex_unlock(&phydev->lock);
500 
501 		return ret;
502 	}
503 
504 	return -EOPNOTSUPP;
505 }
506 EXPORT_SYMBOL(phy_ethtool_get_sset_count);
507 
508 /**
509  * phy_ethtool_get_stats - Get the statistic counters
510  *
511  * @phydev: the phy_device struct
512  * @stats: What counters to get
513  * @data: Where to store the counters
514  */
phy_ethtool_get_stats(struct phy_device * phydev,struct ethtool_stats * stats,u64 * data)515 int phy_ethtool_get_stats(struct phy_device *phydev,
516 			  struct ethtool_stats *stats, u64 *data)
517 {
518 	if (!phydev->drv)
519 		return -EIO;
520 
521 	mutex_lock(&phydev->lock);
522 	phydev->drv->get_stats(phydev, stats, data);
523 	mutex_unlock(&phydev->lock);
524 
525 	return 0;
526 }
527 EXPORT_SYMBOL(phy_ethtool_get_stats);
528 
529 /**
530  * phy_start_cable_test - Start a cable test
531  *
532  * @phydev: the phy_device struct
533  * @extack: extack for reporting useful error messages
534  */
phy_start_cable_test(struct phy_device * phydev,struct netlink_ext_ack * extack)535 int phy_start_cable_test(struct phy_device *phydev,
536 			 struct netlink_ext_ack *extack)
537 {
538 	struct net_device *dev = phydev->attached_dev;
539 	int err = -ENOMEM;
540 
541 	if (!(phydev->drv &&
542 	      phydev->drv->cable_test_start &&
543 	      phydev->drv->cable_test_get_status)) {
544 		NL_SET_ERR_MSG(extack,
545 			       "PHY driver does not support cable testing");
546 		return -EOPNOTSUPP;
547 	}
548 
549 	mutex_lock(&phydev->lock);
550 	if (phydev->state == PHY_CABLETEST) {
551 		NL_SET_ERR_MSG(extack,
552 			       "PHY already performing a test");
553 		err = -EBUSY;
554 		goto out;
555 	}
556 
557 	if (phydev->state < PHY_UP ||
558 	    phydev->state > PHY_CABLETEST) {
559 		NL_SET_ERR_MSG(extack,
560 			       "PHY not configured. Try setting interface up");
561 		err = -EBUSY;
562 		goto out;
563 	}
564 
565 	err = ethnl_cable_test_alloc(phydev, ETHTOOL_MSG_CABLE_TEST_NTF);
566 	if (err)
567 		goto out;
568 
569 	/* Mark the carrier down until the test is complete */
570 	phy_link_down(phydev);
571 
572 	netif_testing_on(dev);
573 	err = phydev->drv->cable_test_start(phydev);
574 	if (err) {
575 		netif_testing_off(dev);
576 		phy_link_up(phydev);
577 		goto out_free;
578 	}
579 
580 	phydev->state = PHY_CABLETEST;
581 
582 	if (phy_polling_mode(phydev))
583 		phy_trigger_machine(phydev);
584 
585 	mutex_unlock(&phydev->lock);
586 
587 	return 0;
588 
589 out_free:
590 	ethnl_cable_test_free(phydev);
591 out:
592 	mutex_unlock(&phydev->lock);
593 
594 	return err;
595 }
596 EXPORT_SYMBOL(phy_start_cable_test);
597 
598 /**
599  * phy_start_cable_test_tdr - Start a raw TDR cable test
600  *
601  * @phydev: the phy_device struct
602  * @extack: extack for reporting useful error messages
603  * @config: Configuration of the test to run
604  */
phy_start_cable_test_tdr(struct phy_device * phydev,struct netlink_ext_ack * extack,const struct phy_tdr_config * config)605 int phy_start_cable_test_tdr(struct phy_device *phydev,
606 			     struct netlink_ext_ack *extack,
607 			     const struct phy_tdr_config *config)
608 {
609 	struct net_device *dev = phydev->attached_dev;
610 	int err = -ENOMEM;
611 
612 	if (!(phydev->drv &&
613 	      phydev->drv->cable_test_tdr_start &&
614 	      phydev->drv->cable_test_get_status)) {
615 		NL_SET_ERR_MSG(extack,
616 			       "PHY driver does not support cable test TDR");
617 		return -EOPNOTSUPP;
618 	}
619 
620 	mutex_lock(&phydev->lock);
621 	if (phydev->state == PHY_CABLETEST) {
622 		NL_SET_ERR_MSG(extack,
623 			       "PHY already performing a test");
624 		err = -EBUSY;
625 		goto out;
626 	}
627 
628 	if (phydev->state < PHY_UP ||
629 	    phydev->state > PHY_CABLETEST) {
630 		NL_SET_ERR_MSG(extack,
631 			       "PHY not configured. Try setting interface up");
632 		err = -EBUSY;
633 		goto out;
634 	}
635 
636 	err = ethnl_cable_test_alloc(phydev, ETHTOOL_MSG_CABLE_TEST_TDR_NTF);
637 	if (err)
638 		goto out;
639 
640 	/* Mark the carrier down until the test is complete */
641 	phy_link_down(phydev);
642 
643 	netif_testing_on(dev);
644 	err = phydev->drv->cable_test_tdr_start(phydev, config);
645 	if (err) {
646 		netif_testing_off(dev);
647 		phy_link_up(phydev);
648 		goto out_free;
649 	}
650 
651 	phydev->state = PHY_CABLETEST;
652 
653 	if (phy_polling_mode(phydev))
654 		phy_trigger_machine(phydev);
655 
656 	mutex_unlock(&phydev->lock);
657 
658 	return 0;
659 
660 out_free:
661 	ethnl_cable_test_free(phydev);
662 out:
663 	mutex_unlock(&phydev->lock);
664 
665 	return err;
666 }
667 EXPORT_SYMBOL(phy_start_cable_test_tdr);
668 
phy_config_aneg(struct phy_device * phydev)669 static int phy_config_aneg(struct phy_device *phydev)
670 {
671 	if (phydev->drv->config_aneg)
672 		return phydev->drv->config_aneg(phydev);
673 
674 	/* Clause 45 PHYs that don't implement Clause 22 registers are not
675 	 * allowed to call genphy_config_aneg()
676 	 */
677 	if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
678 		return genphy_c45_config_aneg(phydev);
679 
680 	return genphy_config_aneg(phydev);
681 }
682 
683 /**
684  * phy_check_link_status - check link status and set state accordingly
685  * @phydev: the phy_device struct
686  *
687  * Description: Check for link and whether autoneg was triggered / is running
688  * and set state accordingly
689  */
phy_check_link_status(struct phy_device * phydev)690 static int phy_check_link_status(struct phy_device *phydev)
691 {
692 	int err;
693 
694 	WARN_ON(!mutex_is_locked(&phydev->lock));
695 
696 	/* Keep previous state if loopback is enabled because some PHYs
697 	 * report that Link is Down when loopback is enabled.
698 	 */
699 	if (phydev->loopback_enabled)
700 		return 0;
701 
702 	err = phy_read_status(phydev);
703 	if (err)
704 		return err;
705 
706 	if (phydev->link && phydev->state != PHY_RUNNING) {
707 		phy_check_downshift(phydev);
708 		phydev->state = PHY_RUNNING;
709 		phy_link_up(phydev);
710 	} else if (!phydev->link && phydev->state != PHY_NOLINK) {
711 		phydev->state = PHY_NOLINK;
712 		phy_link_down(phydev);
713 	}
714 
715 	return 0;
716 }
717 
718 /**
719  * _phy_start_aneg - start auto-negotiation for this PHY device
720  * @phydev: the phy_device struct
721  *
722  * Description: Sanitizes the settings (if we're not autonegotiating
723  *   them), and then calls the driver's config_aneg function.
724  *   If the PHYCONTROL Layer is operating, we change the state to
725  *   reflect the beginning of Auto-negotiation or forcing.
726  */
_phy_start_aneg(struct phy_device * phydev)727 static int _phy_start_aneg(struct phy_device *phydev)
728 {
729 	int err;
730 
731 	lockdep_assert_held(&phydev->lock);
732 
733 	if (!phydev->drv)
734 		return -EIO;
735 
736 	if (AUTONEG_DISABLE == phydev->autoneg)
737 		phy_sanitize_settings(phydev);
738 
739 	err = phy_config_aneg(phydev);
740 	if (err < 0)
741 		return err;
742 
743 	if (phy_is_started(phydev))
744 		err = phy_check_link_status(phydev);
745 
746 	return err;
747 }
748 
749 /**
750  * phy_start_aneg - start auto-negotiation for this PHY device
751  * @phydev: the phy_device struct
752  *
753  * Description: Sanitizes the settings (if we're not autonegotiating
754  *   them), and then calls the driver's config_aneg function.
755  *   If the PHYCONTROL Layer is operating, we change the state to
756  *   reflect the beginning of Auto-negotiation or forcing.
757  */
phy_start_aneg(struct phy_device * phydev)758 int phy_start_aneg(struct phy_device *phydev)
759 {
760 	int err;
761 
762 	mutex_lock(&phydev->lock);
763 	err = _phy_start_aneg(phydev);
764 	mutex_unlock(&phydev->lock);
765 
766 	return err;
767 }
768 EXPORT_SYMBOL(phy_start_aneg);
769 
phy_poll_aneg_done(struct phy_device * phydev)770 static int phy_poll_aneg_done(struct phy_device *phydev)
771 {
772 	unsigned int retries = 100;
773 	int ret;
774 
775 	do {
776 		msleep(100);
777 		ret = phy_aneg_done(phydev);
778 	} while (!ret && --retries);
779 
780 	if (!ret)
781 		return -ETIMEDOUT;
782 
783 	return ret < 0 ? ret : 0;
784 }
785 
phy_ethtool_ksettings_set(struct phy_device * phydev,const struct ethtool_link_ksettings * cmd)786 int phy_ethtool_ksettings_set(struct phy_device *phydev,
787 			      const struct ethtool_link_ksettings *cmd)
788 {
789 	__ETHTOOL_DECLARE_LINK_MODE_MASK(advertising);
790 	u8 autoneg = cmd->base.autoneg;
791 	u8 duplex = cmd->base.duplex;
792 	u32 speed = cmd->base.speed;
793 
794 	if (cmd->base.phy_address != phydev->mdio.addr)
795 		return -EINVAL;
796 
797 	linkmode_copy(advertising, cmd->link_modes.advertising);
798 
799 	/* We make sure that we don't pass unsupported values in to the PHY */
800 	linkmode_and(advertising, advertising, phydev->supported);
801 
802 	/* Verify the settings we care about. */
803 	if (autoneg != AUTONEG_ENABLE && autoneg != AUTONEG_DISABLE)
804 		return -EINVAL;
805 
806 	if (autoneg == AUTONEG_ENABLE && linkmode_empty(advertising))
807 		return -EINVAL;
808 
809 	if (autoneg == AUTONEG_DISABLE &&
810 	    ((speed != SPEED_1000 &&
811 	      speed != SPEED_100 &&
812 	      speed != SPEED_10) ||
813 	     (duplex != DUPLEX_HALF &&
814 	      duplex != DUPLEX_FULL)))
815 		return -EINVAL;
816 
817 	mutex_lock(&phydev->lock);
818 	phydev->autoneg = autoneg;
819 
820 	if (autoneg == AUTONEG_DISABLE) {
821 		phydev->speed = speed;
822 		phydev->duplex = duplex;
823 	}
824 
825 	linkmode_copy(phydev->advertising, advertising);
826 
827 	linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
828 			 phydev->advertising, autoneg == AUTONEG_ENABLE);
829 
830 	phydev->master_slave_set = cmd->base.master_slave_cfg;
831 	phydev->mdix_ctrl = cmd->base.eth_tp_mdix_ctrl;
832 
833 	/* Restart the PHY */
834 	if (phy_is_started(phydev)) {
835 		phydev->state = PHY_UP;
836 		phy_trigger_machine(phydev);
837 	} else {
838 		_phy_start_aneg(phydev);
839 	}
840 
841 	mutex_unlock(&phydev->lock);
842 	return 0;
843 }
844 EXPORT_SYMBOL(phy_ethtool_ksettings_set);
845 
846 /**
847  * phy_speed_down - set speed to lowest speed supported by both link partners
848  * @phydev: the phy_device struct
849  * @sync: perform action synchronously
850  *
851  * Description: Typically used to save energy when waiting for a WoL packet
852  *
853  * WARNING: Setting sync to false may cause the system being unable to suspend
854  * in case the PHY generates an interrupt when finishing the autonegotiation.
855  * This interrupt may wake up the system immediately after suspend.
856  * Therefore use sync = false only if you're sure it's safe with the respective
857  * network chip.
858  */
phy_speed_down(struct phy_device * phydev,bool sync)859 int phy_speed_down(struct phy_device *phydev, bool sync)
860 {
861 	__ETHTOOL_DECLARE_LINK_MODE_MASK(adv_tmp);
862 	int ret;
863 
864 	if (phydev->autoneg != AUTONEG_ENABLE)
865 		return 0;
866 
867 	linkmode_copy(adv_tmp, phydev->advertising);
868 
869 	ret = phy_speed_down_core(phydev);
870 	if (ret)
871 		return ret;
872 
873 	linkmode_copy(phydev->adv_old, adv_tmp);
874 
875 	if (linkmode_equal(phydev->advertising, adv_tmp))
876 		return 0;
877 
878 	ret = phy_config_aneg(phydev);
879 	if (ret)
880 		return ret;
881 
882 	return sync ? phy_poll_aneg_done(phydev) : 0;
883 }
884 EXPORT_SYMBOL_GPL(phy_speed_down);
885 
886 /**
887  * phy_speed_up - (re)set advertised speeds to all supported speeds
888  * @phydev: the phy_device struct
889  *
890  * Description: Used to revert the effect of phy_speed_down
891  */
phy_speed_up(struct phy_device * phydev)892 int phy_speed_up(struct phy_device *phydev)
893 {
894 	__ETHTOOL_DECLARE_LINK_MODE_MASK(adv_tmp);
895 
896 	if (phydev->autoneg != AUTONEG_ENABLE)
897 		return 0;
898 
899 	if (linkmode_empty(phydev->adv_old))
900 		return 0;
901 
902 	linkmode_copy(adv_tmp, phydev->advertising);
903 	linkmode_copy(phydev->advertising, phydev->adv_old);
904 	linkmode_zero(phydev->adv_old);
905 
906 	if (linkmode_equal(phydev->advertising, adv_tmp))
907 		return 0;
908 
909 	return phy_config_aneg(phydev);
910 }
911 EXPORT_SYMBOL_GPL(phy_speed_up);
912 
913 /**
914  * phy_start_machine - start PHY state machine tracking
915  * @phydev: the phy_device struct
916  *
917  * Description: The PHY infrastructure can run a state machine
918  *   which tracks whether the PHY is starting up, negotiating,
919  *   etc.  This function starts the delayed workqueue which tracks
920  *   the state of the PHY. If you want to maintain your own state machine,
921  *   do not call this function.
922  */
phy_start_machine(struct phy_device * phydev)923 void phy_start_machine(struct phy_device *phydev)
924 {
925 	phy_trigger_machine(phydev);
926 }
927 EXPORT_SYMBOL_GPL(phy_start_machine);
928 
929 /**
930  * phy_stop_machine - stop the PHY state machine tracking
931  * @phydev: target phy_device struct
932  *
933  * Description: Stops the state machine delayed workqueue, sets the
934  *   state to UP (unless it wasn't up yet). This function must be
935  *   called BEFORE phy_detach.
936  */
phy_stop_machine(struct phy_device * phydev)937 void phy_stop_machine(struct phy_device *phydev)
938 {
939 	cancel_delayed_work_sync(&phydev->state_queue);
940 
941 	mutex_lock(&phydev->lock);
942 	if (phy_is_started(phydev))
943 		phydev->state = PHY_UP;
944 	mutex_unlock(&phydev->lock);
945 }
946 
947 /**
948  * phy_error - enter HALTED state for this PHY device
949  * @phydev: target phy_device struct
950  *
951  * Moves the PHY to the HALTED state in response to a read
952  * or write error, and tells the controller the link is down.
953  * Must not be called from interrupt context, or while the
954  * phydev->lock is held.
955  */
phy_error(struct phy_device * phydev)956 static void phy_error(struct phy_device *phydev)
957 {
958 	WARN_ON(1);
959 
960 	mutex_lock(&phydev->lock);
961 	phydev->state = PHY_HALTED;
962 	mutex_unlock(&phydev->lock);
963 
964 	phy_trigger_machine(phydev);
965 }
966 
967 /**
968  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
969  * @phydev: target phy_device struct
970  */
phy_disable_interrupts(struct phy_device * phydev)971 int phy_disable_interrupts(struct phy_device *phydev)
972 {
973 	int err;
974 
975 	/* Disable PHY interrupts */
976 	err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
977 	if (err)
978 		return err;
979 
980 	/* Clear the interrupt */
981 	return phy_clear_interrupt(phydev);
982 }
983 
984 /**
985  * phy_interrupt - PHY interrupt handler
986  * @irq: interrupt line
987  * @phy_dat: phy_device pointer
988  *
989  * Description: Handle PHY interrupt
990  */
phy_interrupt(int irq,void * phy_dat)991 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
992 {
993 	struct phy_device *phydev = phy_dat;
994 	struct phy_driver *drv = phydev->drv;
995 
996 	if (drv->handle_interrupt)
997 		return drv->handle_interrupt(phydev);
998 
999 	if (drv->did_interrupt && !drv->did_interrupt(phydev))
1000 		return IRQ_NONE;
1001 
1002 	/* reschedule state queue work to run as soon as possible */
1003 	phy_trigger_machine(phydev);
1004 
1005 	/* did_interrupt() may have cleared the interrupt already */
1006 	if (!drv->did_interrupt && phy_clear_interrupt(phydev)) {
1007 		phy_error(phydev);
1008 		return IRQ_NONE;
1009 	}
1010 
1011 	return IRQ_HANDLED;
1012 }
1013 
1014 /**
1015  * phy_enable_interrupts - Enable the interrupts from the PHY side
1016  * @phydev: target phy_device struct
1017  */
phy_enable_interrupts(struct phy_device * phydev)1018 static int phy_enable_interrupts(struct phy_device *phydev)
1019 {
1020 	int err = phy_clear_interrupt(phydev);
1021 
1022 	if (err < 0)
1023 		return err;
1024 
1025 	return phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
1026 }
1027 
1028 /**
1029  * phy_request_interrupt - request and enable interrupt for a PHY device
1030  * @phydev: target phy_device struct
1031  *
1032  * Description: Request and enable the interrupt for the given PHY.
1033  *   If this fails, then we set irq to PHY_POLL.
1034  *   This should only be called with a valid IRQ number.
1035  */
phy_request_interrupt(struct phy_device * phydev)1036 void phy_request_interrupt(struct phy_device *phydev)
1037 {
1038 	int err;
1039 
1040 	err = request_threaded_irq(phydev->irq, NULL, phy_interrupt,
1041 				   IRQF_ONESHOT | IRQF_SHARED,
1042 				   phydev_name(phydev), phydev);
1043 	if (err) {
1044 		phydev_warn(phydev, "Error %d requesting IRQ %d, falling back to polling\n",
1045 			    err, phydev->irq);
1046 		phydev->irq = PHY_POLL;
1047 	} else {
1048 		if (phy_enable_interrupts(phydev)) {
1049 			phydev_warn(phydev, "Can't enable interrupt, falling back to polling\n");
1050 			phy_free_interrupt(phydev);
1051 			phydev->irq = PHY_POLL;
1052 		}
1053 	}
1054 }
1055 EXPORT_SYMBOL(phy_request_interrupt);
1056 
1057 /**
1058  * phy_free_interrupt - disable and free interrupt for a PHY device
1059  * @phydev: target phy_device struct
1060  *
1061  * Description: Disable and free the interrupt for the given PHY.
1062  *   This should only be called with a valid IRQ number.
1063  */
phy_free_interrupt(struct phy_device * phydev)1064 void phy_free_interrupt(struct phy_device *phydev)
1065 {
1066 	phy_disable_interrupts(phydev);
1067 	free_irq(phydev->irq, phydev);
1068 }
1069 EXPORT_SYMBOL(phy_free_interrupt);
1070 
1071 /**
1072  * phy_stop - Bring down the PHY link, and stop checking the status
1073  * @phydev: target phy_device struct
1074  */
phy_stop(struct phy_device * phydev)1075 void phy_stop(struct phy_device *phydev)
1076 {
1077 	struct net_device *dev = phydev->attached_dev;
1078 
1079 	if (!phy_is_started(phydev) && phydev->state != PHY_DOWN) {
1080 		WARN(1, "called from state %s\n",
1081 		     phy_state_to_str(phydev->state));
1082 		return;
1083 	}
1084 
1085 	mutex_lock(&phydev->lock);
1086 
1087 	if (phydev->state == PHY_CABLETEST) {
1088 		phy_abort_cable_test(phydev);
1089 		netif_testing_off(dev);
1090 	}
1091 
1092 	if (phydev->sfp_bus)
1093 		sfp_upstream_stop(phydev->sfp_bus);
1094 
1095 	phydev->state = PHY_HALTED;
1096 
1097 	mutex_unlock(&phydev->lock);
1098 
1099 	phy_state_machine(&phydev->state_queue.work);
1100 	phy_stop_machine(phydev);
1101 
1102 	/* Cannot call flush_scheduled_work() here as desired because
1103 	 * of rtnl_lock(), but PHY_HALTED shall guarantee irq handler
1104 	 * will not reenable interrupts.
1105 	 */
1106 }
1107 EXPORT_SYMBOL(phy_stop);
1108 
1109 /**
1110  * phy_start - start or restart a PHY device
1111  * @phydev: target phy_device struct
1112  *
1113  * Description: Indicates the attached device's readiness to
1114  *   handle PHY-related work.  Used during startup to start the
1115  *   PHY, and after a call to phy_stop() to resume operation.
1116  *   Also used to indicate the MDIO bus has cleared an error
1117  *   condition.
1118  */
phy_start(struct phy_device * phydev)1119 void phy_start(struct phy_device *phydev)
1120 {
1121 	mutex_lock(&phydev->lock);
1122 
1123 	if (phydev->state != PHY_READY && phydev->state != PHY_HALTED) {
1124 		WARN(1, "called from state %s\n",
1125 		     phy_state_to_str(phydev->state));
1126 		goto out;
1127 	}
1128 
1129 	if (phydev->sfp_bus)
1130 		sfp_upstream_start(phydev->sfp_bus);
1131 
1132 	/* if phy was suspended, bring the physical link up again */
1133 	__phy_resume(phydev);
1134 
1135 	phydev->state = PHY_UP;
1136 
1137 	phy_start_machine(phydev);
1138 out:
1139 	mutex_unlock(&phydev->lock);
1140 }
1141 EXPORT_SYMBOL(phy_start);
1142 
1143 /**
1144  * phy_state_machine - Handle the state machine
1145  * @work: work_struct that describes the work to be done
1146  */
phy_state_machine(struct work_struct * work)1147 void phy_state_machine(struct work_struct *work)
1148 {
1149 	struct delayed_work *dwork = to_delayed_work(work);
1150 	struct phy_device *phydev =
1151 			container_of(dwork, struct phy_device, state_queue);
1152 	struct net_device *dev = phydev->attached_dev;
1153 	bool needs_aneg = false, do_suspend = false;
1154 	enum phy_state old_state;
1155 	bool finished = false;
1156 	int err = 0;
1157 
1158 	mutex_lock(&phydev->lock);
1159 
1160 	old_state = phydev->state;
1161 
1162 	switch (phydev->state) {
1163 	case PHY_DOWN:
1164 	case PHY_READY:
1165 		break;
1166 	case PHY_UP:
1167 		needs_aneg = true;
1168 
1169 		break;
1170 	case PHY_NOLINK:
1171 	case PHY_RUNNING:
1172 		err = phy_check_link_status(phydev);
1173 		break;
1174 	case PHY_CABLETEST:
1175 		err = phydev->drv->cable_test_get_status(phydev, &finished);
1176 		if (err) {
1177 			phy_abort_cable_test(phydev);
1178 			netif_testing_off(dev);
1179 			needs_aneg = true;
1180 			phydev->state = PHY_UP;
1181 			break;
1182 		}
1183 
1184 		if (finished) {
1185 			ethnl_cable_test_finished(phydev);
1186 			netif_testing_off(dev);
1187 			needs_aneg = true;
1188 			phydev->state = PHY_UP;
1189 		}
1190 		break;
1191 	case PHY_HALTED:
1192 		if (phydev->link) {
1193 			phydev->link = 0;
1194 			phy_link_down(phydev);
1195 		}
1196 		do_suspend = true;
1197 		break;
1198 	}
1199 
1200 	mutex_unlock(&phydev->lock);
1201 
1202 	if (needs_aneg)
1203 		err = phy_start_aneg(phydev);
1204 	else if (do_suspend)
1205 		phy_suspend(phydev);
1206 
1207 	if (err < 0)
1208 		phy_error(phydev);
1209 
1210 	if (old_state != phydev->state) {
1211 		phydev_dbg(phydev, "PHY state change %s -> %s\n",
1212 			   phy_state_to_str(old_state),
1213 			   phy_state_to_str(phydev->state));
1214 		if (phydev->drv && phydev->drv->link_change_notify)
1215 			phydev->drv->link_change_notify(phydev);
1216 	}
1217 
1218 	/* Only re-schedule a PHY state machine change if we are polling the
1219 	 * PHY, if PHY_IGNORE_INTERRUPT is set, then we will be moving
1220 	 * between states from phy_mac_interrupt().
1221 	 *
1222 	 * In state PHY_HALTED the PHY gets suspended, so rescheduling the
1223 	 * state machine would be pointless and possibly error prone when
1224 	 * called from phy_disconnect() synchronously.
1225 	 */
1226 	mutex_lock(&phydev->lock);
1227 	if (phy_polling_mode(phydev) && phy_is_started(phydev))
1228 		phy_queue_state_machine(phydev, PHY_STATE_TIME);
1229 	mutex_unlock(&phydev->lock);
1230 }
1231 
1232 /**
1233  * phy_mac_interrupt - MAC says the link has changed
1234  * @phydev: phy_device struct with changed link
1235  *
1236  * The MAC layer is able to indicate there has been a change in the PHY link
1237  * status. Trigger the state machine and work a work queue.
1238  */
phy_mac_interrupt(struct phy_device * phydev)1239 void phy_mac_interrupt(struct phy_device *phydev)
1240 {
1241 	/* Trigger a state machine change */
1242 	phy_trigger_machine(phydev);
1243 }
1244 EXPORT_SYMBOL(phy_mac_interrupt);
1245 
mmd_eee_adv_to_linkmode(unsigned long * advertising,u16 eee_adv)1246 static void mmd_eee_adv_to_linkmode(unsigned long *advertising, u16 eee_adv)
1247 {
1248 	linkmode_zero(advertising);
1249 
1250 	if (eee_adv & MDIO_EEE_100TX)
1251 		linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
1252 				 advertising);
1253 	if (eee_adv & MDIO_EEE_1000T)
1254 		linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
1255 				 advertising);
1256 	if (eee_adv & MDIO_EEE_10GT)
1257 		linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
1258 				 advertising);
1259 	if (eee_adv & MDIO_EEE_1000KX)
1260 		linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseKX_Full_BIT,
1261 				 advertising);
1262 	if (eee_adv & MDIO_EEE_10GKX4)
1263 		linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT,
1264 				 advertising);
1265 	if (eee_adv & MDIO_EEE_10GKR)
1266 		linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseKR_Full_BIT,
1267 				 advertising);
1268 }
1269 
1270 /**
1271  * phy_init_eee - init and check the EEE feature
1272  * @phydev: target phy_device struct
1273  * @clk_stop_enable: PHY may stop the clock during LPI
1274  *
1275  * Description: it checks if the Energy-Efficient Ethernet (EEE)
1276  * is supported by looking at the MMD registers 3.20 and 7.60/61
1277  * and it programs the MMD register 3.0 setting the "Clock stop enable"
1278  * bit if required.
1279  */
phy_init_eee(struct phy_device * phydev,bool clk_stop_enable)1280 int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
1281 {
1282 	if (!phydev->drv)
1283 		return -EIO;
1284 
1285 	/* According to 802.3az,the EEE is supported only in full duplex-mode.
1286 	 */
1287 	if (phydev->duplex == DUPLEX_FULL) {
1288 		__ETHTOOL_DECLARE_LINK_MODE_MASK(common);
1289 		__ETHTOOL_DECLARE_LINK_MODE_MASK(lp);
1290 		__ETHTOOL_DECLARE_LINK_MODE_MASK(adv);
1291 		int eee_lp, eee_cap, eee_adv;
1292 		int status;
1293 		u32 cap;
1294 
1295 		/* Read phy status to properly get the right settings */
1296 		status = phy_read_status(phydev);
1297 		if (status)
1298 			return status;
1299 
1300 		/* First check if the EEE ability is supported */
1301 		eee_cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1302 		if (eee_cap <= 0)
1303 			goto eee_exit_err;
1304 
1305 		cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap);
1306 		if (!cap)
1307 			goto eee_exit_err;
1308 
1309 		/* Check which link settings negotiated and verify it in
1310 		 * the EEE advertising registers.
1311 		 */
1312 		eee_lp = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
1313 		if (eee_lp <= 0)
1314 			goto eee_exit_err;
1315 
1316 		eee_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1317 		if (eee_adv <= 0)
1318 			goto eee_exit_err;
1319 
1320 		mmd_eee_adv_to_linkmode(adv, eee_adv);
1321 		mmd_eee_adv_to_linkmode(lp, eee_lp);
1322 		linkmode_and(common, adv, lp);
1323 
1324 		if (!phy_check_valid(phydev->speed, phydev->duplex, common))
1325 			goto eee_exit_err;
1326 
1327 		if (clk_stop_enable)
1328 			/* Configure the PHY to stop receiving xMII
1329 			 * clock while it is signaling LPI.
1330 			 */
1331 			phy_set_bits_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1,
1332 					 MDIO_PCS_CTRL1_CLKSTOP_EN);
1333 
1334 		return 0; /* EEE supported */
1335 	}
1336 eee_exit_err:
1337 	return -EPROTONOSUPPORT;
1338 }
1339 EXPORT_SYMBOL(phy_init_eee);
1340 
1341 /**
1342  * phy_get_eee_err - report the EEE wake error count
1343  * @phydev: target phy_device struct
1344  *
1345  * Description: it is to report the number of time where the PHY
1346  * failed to complete its normal wake sequence.
1347  */
phy_get_eee_err(struct phy_device * phydev)1348 int phy_get_eee_err(struct phy_device *phydev)
1349 {
1350 	if (!phydev->drv)
1351 		return -EIO;
1352 
1353 	return phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_WK_ERR);
1354 }
1355 EXPORT_SYMBOL(phy_get_eee_err);
1356 
1357 /**
1358  * phy_ethtool_get_eee - get EEE supported and status
1359  * @phydev: target phy_device struct
1360  * @data: ethtool_eee data
1361  *
1362  * Description: it reportes the Supported/Advertisement/LP Advertisement
1363  * capabilities.
1364  */
phy_ethtool_get_eee(struct phy_device * phydev,struct ethtool_eee * data)1365 int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data)
1366 {
1367 	int val;
1368 
1369 	if (!phydev->drv)
1370 		return -EIO;
1371 
1372 	/* Get Supported EEE */
1373 	val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1374 	if (val < 0)
1375 		return val;
1376 	data->supported = mmd_eee_cap_to_ethtool_sup_t(val);
1377 
1378 	/* Get advertisement EEE */
1379 	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1380 	if (val < 0)
1381 		return val;
1382 	data->advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1383 	data->eee_enabled = !!data->advertised;
1384 
1385 	/* Get LP advertisement EEE */
1386 	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
1387 	if (val < 0)
1388 		return val;
1389 	data->lp_advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1390 
1391 	data->eee_active = !!(data->advertised & data->lp_advertised);
1392 
1393 	return 0;
1394 }
1395 EXPORT_SYMBOL(phy_ethtool_get_eee);
1396 
1397 /**
1398  * phy_ethtool_set_eee - set EEE supported and status
1399  * @phydev: target phy_device struct
1400  * @data: ethtool_eee data
1401  *
1402  * Description: it is to program the Advertisement EEE register.
1403  */
phy_ethtool_set_eee(struct phy_device * phydev,struct ethtool_eee * data)1404 int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
1405 {
1406 	int cap, old_adv, adv = 0, ret;
1407 
1408 	if (!phydev->drv)
1409 		return -EIO;
1410 
1411 	/* Get Supported EEE */
1412 	cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1413 	if (cap < 0)
1414 		return cap;
1415 
1416 	old_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1417 	if (old_adv < 0)
1418 		return old_adv;
1419 
1420 	if (data->eee_enabled) {
1421 		adv = !data->advertised ? cap :
1422 		      ethtool_adv_to_mmd_eee_adv_t(data->advertised) & cap;
1423 		/* Mask prohibited EEE modes */
1424 		adv &= ~phydev->eee_broken_modes;
1425 	}
1426 
1427 	if (old_adv != adv) {
1428 		ret = phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv);
1429 		if (ret < 0)
1430 			return ret;
1431 
1432 		/* Restart autonegotiation so the new modes get sent to the
1433 		 * link partner.
1434 		 */
1435 		if (phydev->autoneg == AUTONEG_ENABLE) {
1436 			ret = phy_restart_aneg(phydev);
1437 			if (ret < 0)
1438 				return ret;
1439 		}
1440 	}
1441 
1442 	return 0;
1443 }
1444 EXPORT_SYMBOL(phy_ethtool_set_eee);
1445 
1446 /**
1447  * phy_ethtool_set_wol - Configure Wake On LAN
1448  *
1449  * @phydev: target phy_device struct
1450  * @wol: Configuration requested
1451  */
phy_ethtool_set_wol(struct phy_device * phydev,struct ethtool_wolinfo * wol)1452 int phy_ethtool_set_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1453 {
1454 	if (phydev->drv && phydev->drv->set_wol)
1455 		return phydev->drv->set_wol(phydev, wol);
1456 
1457 	return -EOPNOTSUPP;
1458 }
1459 EXPORT_SYMBOL(phy_ethtool_set_wol);
1460 
1461 /**
1462  * phy_ethtool_get_wol - Get the current Wake On LAN configuration
1463  *
1464  * @phydev: target phy_device struct
1465  * @wol: Store the current configuration here
1466  */
phy_ethtool_get_wol(struct phy_device * phydev,struct ethtool_wolinfo * wol)1467 void phy_ethtool_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1468 {
1469 	if (phydev->drv && phydev->drv->get_wol)
1470 		phydev->drv->get_wol(phydev, wol);
1471 }
1472 EXPORT_SYMBOL(phy_ethtool_get_wol);
1473 
phy_ethtool_get_link_ksettings(struct net_device * ndev,struct ethtool_link_ksettings * cmd)1474 int phy_ethtool_get_link_ksettings(struct net_device *ndev,
1475 				   struct ethtool_link_ksettings *cmd)
1476 {
1477 	struct phy_device *phydev = ndev->phydev;
1478 
1479 	if (!phydev)
1480 		return -ENODEV;
1481 
1482 	phy_ethtool_ksettings_get(phydev, cmd);
1483 
1484 	return 0;
1485 }
1486 EXPORT_SYMBOL(phy_ethtool_get_link_ksettings);
1487 
phy_ethtool_set_link_ksettings(struct net_device * ndev,const struct ethtool_link_ksettings * cmd)1488 int phy_ethtool_set_link_ksettings(struct net_device *ndev,
1489 				   const struct ethtool_link_ksettings *cmd)
1490 {
1491 	struct phy_device *phydev = ndev->phydev;
1492 
1493 	if (!phydev)
1494 		return -ENODEV;
1495 
1496 	return phy_ethtool_ksettings_set(phydev, cmd);
1497 }
1498 EXPORT_SYMBOL(phy_ethtool_set_link_ksettings);
1499 
1500 /**
1501  * phy_ethtool_nway_reset - Restart auto negotiation
1502  * @ndev: Network device to restart autoneg for
1503  */
phy_ethtool_nway_reset(struct net_device * ndev)1504 int phy_ethtool_nway_reset(struct net_device *ndev)
1505 {
1506 	struct phy_device *phydev = ndev->phydev;
1507 
1508 	if (!phydev)
1509 		return -ENODEV;
1510 
1511 	if (!phydev->drv)
1512 		return -EIO;
1513 
1514 	return phy_restart_aneg(phydev);
1515 }
1516 EXPORT_SYMBOL(phy_ethtool_nway_reset);
1517