xref: /openbmc/u-boot/drivers/net/phy/phy.c (revision c32a6fd07b1839e4a45729587ebc8e1c55601a4d)
1 /*
2  * Generic PHY Management code
3  *
4  * SPDX-License-Identifier:	GPL-2.0+
5  *
6  * Copyright 2011 Freescale Semiconductor, Inc.
7  * author Andy Fleming
8  *
9  * Based loosely off of Linux's PHY Lib
10  */
11 
12 #include <config.h>
13 #include <common.h>
14 #include <console.h>
15 #include <dm.h>
16 #include <malloc.h>
17 #include <net.h>
18 #include <command.h>
19 #include <miiphy.h>
20 #include <phy.h>
21 #include <errno.h>
22 #include <linux/err.h>
23 #include <linux/compiler.h>
24 
25 DECLARE_GLOBAL_DATA_PTR;
26 
27 /* Generic PHY support and helper functions */
28 
29 /**
30  * genphy_config_advert - sanitize and advertise auto-negotation parameters
31  * @phydev: target phy_device struct
32  *
33  * Description: Writes MII_ADVERTISE with the appropriate values,
34  *   after sanitizing the values to make sure we only advertise
35  *   what is supported.  Returns < 0 on error, 0 if the PHY's advertisement
36  *   hasn't changed, and > 0 if it has changed.
37  */
38 static int genphy_config_advert(struct phy_device *phydev)
39 {
40 	u32 advertise;
41 	int oldadv, adv, bmsr;
42 	int err, changed = 0;
43 
44 	/* Only allow advertising what this PHY supports */
45 	phydev->advertising &= phydev->supported;
46 	advertise = phydev->advertising;
47 
48 	/* Setup standard advertisement */
49 	adv = phy_read(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE);
50 	oldadv = adv;
51 
52 	if (adv < 0)
53 		return adv;
54 
55 	adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
56 		 ADVERTISE_PAUSE_ASYM);
57 	if (advertise & ADVERTISED_10baseT_Half)
58 		adv |= ADVERTISE_10HALF;
59 	if (advertise & ADVERTISED_10baseT_Full)
60 		adv |= ADVERTISE_10FULL;
61 	if (advertise & ADVERTISED_100baseT_Half)
62 		adv |= ADVERTISE_100HALF;
63 	if (advertise & ADVERTISED_100baseT_Full)
64 		adv |= ADVERTISE_100FULL;
65 	if (advertise & ADVERTISED_Pause)
66 		adv |= ADVERTISE_PAUSE_CAP;
67 	if (advertise & ADVERTISED_Asym_Pause)
68 		adv |= ADVERTISE_PAUSE_ASYM;
69 	if (advertise & ADVERTISED_1000baseX_Half)
70 		adv |= ADVERTISE_1000XHALF;
71 	if (advertise & ADVERTISED_1000baseX_Full)
72 		adv |= ADVERTISE_1000XFULL;
73 
74 	if (adv != oldadv) {
75 		err = phy_write(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE, adv);
76 
77 		if (err < 0)
78 			return err;
79 		changed = 1;
80 	}
81 
82 	bmsr = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
83 	if (bmsr < 0)
84 		return bmsr;
85 
86 	/* Per 802.3-2008, Section 22.2.4.2.16 Extended status all
87 	 * 1000Mbits/sec capable PHYs shall have the BMSR_ESTATEN bit set to a
88 	 * logical 1.
89 	 */
90 	if (!(bmsr & BMSR_ESTATEN))
91 		return changed;
92 
93 	/* Configure gigabit if it's supported */
94 	adv = phy_read(phydev, MDIO_DEVAD_NONE, MII_CTRL1000);
95 	oldadv = adv;
96 
97 	if (adv < 0)
98 		return adv;
99 
100 	adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
101 
102 	if (phydev->supported & (SUPPORTED_1000baseT_Half |
103 				SUPPORTED_1000baseT_Full)) {
104 		if (advertise & SUPPORTED_1000baseT_Half)
105 			adv |= ADVERTISE_1000HALF;
106 		if (advertise & SUPPORTED_1000baseT_Full)
107 			adv |= ADVERTISE_1000FULL;
108 	}
109 
110 	if (adv != oldadv)
111 		changed = 1;
112 
113 	err = phy_write(phydev, MDIO_DEVAD_NONE, MII_CTRL1000, adv);
114 	if (err < 0)
115 		return err;
116 
117 	return changed;
118 }
119 
120 
121 /**
122  * genphy_setup_forced - configures/forces speed/duplex from @phydev
123  * @phydev: target phy_device struct
124  *
125  * Description: Configures MII_BMCR to force speed/duplex
126  *   to the values in phydev. Assumes that the values are valid.
127  */
128 static int genphy_setup_forced(struct phy_device *phydev)
129 {
130 	int err;
131 	int ctl = 0;
132 
133 	phydev->pause = phydev->asym_pause = 0;
134 
135 	if (SPEED_1000 == phydev->speed)
136 		ctl |= BMCR_SPEED1000;
137 	else if (SPEED_100 == phydev->speed)
138 		ctl |= BMCR_SPEED100;
139 
140 	if (DUPLEX_FULL == phydev->duplex)
141 		ctl |= BMCR_FULLDPLX;
142 
143 	err = phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, ctl);
144 
145 	return err;
146 }
147 
148 
149 /**
150  * genphy_restart_aneg - Enable and Restart Autonegotiation
151  * @phydev: target phy_device struct
152  */
153 int genphy_restart_aneg(struct phy_device *phydev)
154 {
155 	int ctl;
156 
157 	ctl = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
158 
159 	if (ctl < 0)
160 		return ctl;
161 
162 	ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
163 
164 	/* Don't isolate the PHY if we're negotiating */
165 	ctl &= ~(BMCR_ISOLATE);
166 
167 	ctl = phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, ctl);
168 
169 	return ctl;
170 }
171 
172 
173 /**
174  * genphy_config_aneg - restart auto-negotiation or write BMCR
175  * @phydev: target phy_device struct
176  *
177  * Description: If auto-negotiation is enabled, we configure the
178  *   advertising, and then restart auto-negotiation.  If it is not
179  *   enabled, then we write the BMCR.
180  */
181 int genphy_config_aneg(struct phy_device *phydev)
182 {
183 	int result;
184 
185 	if (AUTONEG_ENABLE != phydev->autoneg)
186 		return genphy_setup_forced(phydev);
187 
188 	result = genphy_config_advert(phydev);
189 
190 	if (result < 0) /* error */
191 		return result;
192 
193 	if (result == 0) {
194 		/* Advertisment hasn't changed, but maybe aneg was never on to
195 		 * begin with?  Or maybe phy was isolated? */
196 		int ctl = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
197 
198 		if (ctl < 0)
199 			return ctl;
200 
201 		if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
202 			result = 1; /* do restart aneg */
203 	}
204 
205 	/* Only restart aneg if we are advertising something different
206 	 * than we were before.	 */
207 	if (result > 0)
208 		result = genphy_restart_aneg(phydev);
209 
210 	return result;
211 }
212 
213 /**
214  * genphy_update_link - update link status in @phydev
215  * @phydev: target phy_device struct
216  *
217  * Description: Update the value in phydev->link to reflect the
218  *   current link value.  In order to do this, we need to read
219  *   the status register twice, keeping the second value.
220  */
221 int genphy_update_link(struct phy_device *phydev)
222 {
223 	unsigned int mii_reg;
224 
225 	/*
226 	 * Wait if the link is up, and autonegotiation is in progress
227 	 * (ie - we're capable and it's not done)
228 	 */
229 	mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
230 
231 	/*
232 	 * If we already saw the link up, and it hasn't gone down, then
233 	 * we don't need to wait for autoneg again
234 	 */
235 	if (phydev->link && mii_reg & BMSR_LSTATUS)
236 		return 0;
237 
238 	if ((mii_reg & BMSR_ANEGCAPABLE) && !(mii_reg & BMSR_ANEGCOMPLETE)) {
239 		int i = 0;
240 
241 		printf("%s Waiting for PHY auto negotiation to complete",
242 			phydev->dev->name);
243 		while (!(mii_reg & BMSR_ANEGCOMPLETE)) {
244 			/*
245 			 * Timeout reached ?
246 			 */
247 			if (i > PHY_ANEG_TIMEOUT) {
248 				printf(" TIMEOUT !\n");
249 				phydev->link = 0;
250 				return 0;
251 			}
252 
253 			if (ctrlc()) {
254 				puts("user interrupt!\n");
255 				phydev->link = 0;
256 				return -EINTR;
257 			}
258 
259 			if ((i++ % 500) == 0)
260 				printf(".");
261 
262 			udelay(1000);	/* 1 ms */
263 			mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
264 		}
265 		printf(" done\n");
266 		phydev->link = 1;
267 	} else {
268 		/* Read the link a second time to clear the latched state */
269 		mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
270 
271 		if (mii_reg & BMSR_LSTATUS)
272 			phydev->link = 1;
273 		else
274 			phydev->link = 0;
275 	}
276 
277 	return 0;
278 }
279 
280 /*
281  * Generic function which updates the speed and duplex.  If
282  * autonegotiation is enabled, it uses the AND of the link
283  * partner's advertised capabilities and our advertised
284  * capabilities.  If autonegotiation is disabled, we use the
285  * appropriate bits in the control register.
286  *
287  * Stolen from Linux's mii.c and phy_device.c
288  */
289 int genphy_parse_link(struct phy_device *phydev)
290 {
291 	int mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
292 
293 	/* We're using autonegotiation */
294 	if (phydev->supported & SUPPORTED_Autoneg) {
295 		u32 lpa = 0;
296 		int gblpa = 0;
297 		u32 estatus = 0;
298 
299 		/* Check for gigabit capability */
300 		if (phydev->supported & (SUPPORTED_1000baseT_Full |
301 					SUPPORTED_1000baseT_Half)) {
302 			/* We want a list of states supported by
303 			 * both PHYs in the link
304 			 */
305 			gblpa = phy_read(phydev, MDIO_DEVAD_NONE, MII_STAT1000);
306 			if (gblpa < 0) {
307 				debug("Could not read MII_STAT1000. Ignoring gigabit capability\n");
308 				gblpa = 0;
309 			}
310 			gblpa &= phy_read(phydev,
311 					MDIO_DEVAD_NONE, MII_CTRL1000) << 2;
312 		}
313 
314 		/* Set the baseline so we only have to set them
315 		 * if they're different
316 		 */
317 		phydev->speed = SPEED_10;
318 		phydev->duplex = DUPLEX_HALF;
319 
320 		/* Check the gigabit fields */
321 		if (gblpa & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD)) {
322 			phydev->speed = SPEED_1000;
323 
324 			if (gblpa & PHY_1000BTSR_1000FD)
325 				phydev->duplex = DUPLEX_FULL;
326 
327 			/* We're done! */
328 			return 0;
329 		}
330 
331 		lpa = phy_read(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE);
332 		lpa &= phy_read(phydev, MDIO_DEVAD_NONE, MII_LPA);
333 
334 		if (lpa & (LPA_100FULL | LPA_100HALF)) {
335 			phydev->speed = SPEED_100;
336 
337 			if (lpa & LPA_100FULL)
338 				phydev->duplex = DUPLEX_FULL;
339 
340 		} else if (lpa & LPA_10FULL)
341 			phydev->duplex = DUPLEX_FULL;
342 
343 		/*
344 		 * Extended status may indicate that the PHY supports
345 		 * 1000BASE-T/X even though the 1000BASE-T registers
346 		 * are missing. In this case we can't tell whether the
347 		 * peer also supports it, so we only check extended
348 		 * status if the 1000BASE-T registers are actually
349 		 * missing.
350 		 */
351 		if ((mii_reg & BMSR_ESTATEN) && !(mii_reg & BMSR_ERCAP))
352 			estatus = phy_read(phydev, MDIO_DEVAD_NONE,
353 					   MII_ESTATUS);
354 
355 		if (estatus & (ESTATUS_1000_XFULL | ESTATUS_1000_XHALF |
356 				ESTATUS_1000_TFULL | ESTATUS_1000_THALF)) {
357 			phydev->speed = SPEED_1000;
358 			if (estatus & (ESTATUS_1000_XFULL | ESTATUS_1000_TFULL))
359 				phydev->duplex = DUPLEX_FULL;
360 		}
361 
362 	} else {
363 		u32 bmcr = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
364 
365 		phydev->speed = SPEED_10;
366 		phydev->duplex = DUPLEX_HALF;
367 
368 		if (bmcr & BMCR_FULLDPLX)
369 			phydev->duplex = DUPLEX_FULL;
370 
371 		if (bmcr & BMCR_SPEED1000)
372 			phydev->speed = SPEED_1000;
373 		else if (bmcr & BMCR_SPEED100)
374 			phydev->speed = SPEED_100;
375 	}
376 
377 	return 0;
378 }
379 
380 int genphy_config(struct phy_device *phydev)
381 {
382 	int val;
383 	u32 features;
384 
385 	features = (SUPPORTED_TP | SUPPORTED_MII
386 			| SUPPORTED_AUI | SUPPORTED_FIBRE |
387 			SUPPORTED_BNC);
388 
389 	/* Do we support autonegotiation? */
390 	val = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
391 
392 	if (val < 0)
393 		return val;
394 
395 	if (val & BMSR_ANEGCAPABLE)
396 		features |= SUPPORTED_Autoneg;
397 
398 	if (val & BMSR_100FULL)
399 		features |= SUPPORTED_100baseT_Full;
400 	if (val & BMSR_100HALF)
401 		features |= SUPPORTED_100baseT_Half;
402 	if (val & BMSR_10FULL)
403 		features |= SUPPORTED_10baseT_Full;
404 	if (val & BMSR_10HALF)
405 		features |= SUPPORTED_10baseT_Half;
406 
407 	if (val & BMSR_ESTATEN) {
408 		val = phy_read(phydev, MDIO_DEVAD_NONE, MII_ESTATUS);
409 
410 		if (val < 0)
411 			return val;
412 
413 		if (val & ESTATUS_1000_TFULL)
414 			features |= SUPPORTED_1000baseT_Full;
415 		if (val & ESTATUS_1000_THALF)
416 			features |= SUPPORTED_1000baseT_Half;
417 		if (val & ESTATUS_1000_XFULL)
418 			features |= SUPPORTED_1000baseX_Full;
419 		if (val & ESTATUS_1000_XHALF)
420 			features |= SUPPORTED_1000baseX_Half;
421 	}
422 
423 	phydev->supported &= features;
424 	phydev->advertising &= features;
425 
426 	genphy_config_aneg(phydev);
427 
428 	return 0;
429 }
430 
431 int genphy_startup(struct phy_device *phydev)
432 {
433 	genphy_update_link(phydev);
434 	genphy_parse_link(phydev);
435 
436 	return 0;
437 }
438 
439 int genphy_shutdown(struct phy_device *phydev)
440 {
441 	return 0;
442 }
443 
444 static struct phy_driver genphy_driver = {
445 	.uid		= 0xffffffff,
446 	.mask		= 0xffffffff,
447 	.name		= "Generic PHY",
448 	.features	= PHY_GBIT_FEATURES | SUPPORTED_MII |
449 			  SUPPORTED_AUI | SUPPORTED_FIBRE |
450 			  SUPPORTED_BNC,
451 	.config		= genphy_config,
452 	.startup	= genphy_startup,
453 	.shutdown	= genphy_shutdown,
454 };
455 
456 static LIST_HEAD(phy_drivers);
457 
458 int phy_init(void)
459 {
460 #ifdef CONFIG_PHY_AQUANTIA
461 	phy_aquantia_init();
462 #endif
463 #ifdef CONFIG_PHY_ATHEROS
464 	phy_atheros_init();
465 #endif
466 #ifdef CONFIG_PHY_BROADCOM
467 	phy_broadcom_init();
468 #endif
469 #ifdef CONFIG_PHY_CORTINA
470 	phy_cortina_init();
471 #endif
472 #ifdef CONFIG_PHY_DAVICOM
473 	phy_davicom_init();
474 #endif
475 #ifdef CONFIG_PHY_ET1011C
476 	phy_et1011c_init();
477 #endif
478 #ifdef CONFIG_PHY_LXT
479 	phy_lxt_init();
480 #endif
481 #ifdef CONFIG_PHY_MARVELL
482 	phy_marvell_init();
483 #endif
484 #ifdef CONFIG_PHY_MICREL
485 	phy_micrel_init();
486 #endif
487 #ifdef CONFIG_PHY_NATSEMI
488 	phy_natsemi_init();
489 #endif
490 #ifdef CONFIG_PHY_REALTEK
491 	phy_realtek_init();
492 #endif
493 #ifdef CONFIG_PHY_SMSC
494 	phy_smsc_init();
495 #endif
496 #ifdef CONFIG_PHY_TERANETICS
497 	phy_teranetics_init();
498 #endif
499 #ifdef CONFIG_PHY_TI
500 	phy_ti_init();
501 #endif
502 #ifdef CONFIG_PHY_VITESSE
503 	phy_vitesse_init();
504 #endif
505 
506 	return 0;
507 }
508 
509 int phy_register(struct phy_driver *drv)
510 {
511 	INIT_LIST_HEAD(&drv->list);
512 	list_add_tail(&drv->list, &phy_drivers);
513 
514 #ifdef CONFIG_NEEDS_MANUAL_RELOC
515 	if (drv->probe)
516 		drv->probe += gd->reloc_off;
517 	if (drv->config)
518 		drv->config += gd->reloc_off;
519 	if (drv->startup)
520 		drv->startup += gd->reloc_off;
521 	if (drv->shutdown)
522 		drv->shutdown += gd->reloc_off;
523 	if (drv->readext)
524 		drv->readext += gd->reloc_off;
525 	if (drv->writeext)
526 		drv->writeext += gd->reloc_off;
527 #endif
528 	return 0;
529 }
530 
531 int phy_set_supported(struct phy_device *phydev, u32 max_speed)
532 {
533 	/* The default values for phydev->supported are provided by the PHY
534 	 * driver "features" member, we want to reset to sane defaults first
535 	 * before supporting higher speeds.
536 	 */
537 	phydev->supported &= PHY_DEFAULT_FEATURES;
538 
539 	switch (max_speed) {
540 	default:
541 		return -ENOTSUPP;
542 	case SPEED_1000:
543 		phydev->supported |= PHY_1000BT_FEATURES;
544 		/* fall through */
545 	case SPEED_100:
546 		phydev->supported |= PHY_100BT_FEATURES;
547 		/* fall through */
548 	case SPEED_10:
549 		phydev->supported |= PHY_10BT_FEATURES;
550 	}
551 
552 	return 0;
553 }
554 
555 static int phy_probe(struct phy_device *phydev)
556 {
557 	int err = 0;
558 
559 	phydev->advertising = phydev->supported = phydev->drv->features;
560 	phydev->mmds = phydev->drv->mmds;
561 
562 	if (phydev->drv->probe)
563 		err = phydev->drv->probe(phydev);
564 
565 	return err;
566 }
567 
568 static struct phy_driver *generic_for_interface(phy_interface_t interface)
569 {
570 #ifdef CONFIG_PHYLIB_10G
571 	if (is_10g_interface(interface))
572 		return &gen10g_driver;
573 #endif
574 
575 	return &genphy_driver;
576 }
577 
578 static struct phy_driver *get_phy_driver(struct phy_device *phydev,
579 				phy_interface_t interface)
580 {
581 	struct list_head *entry;
582 	int phy_id = phydev->phy_id;
583 	struct phy_driver *drv = NULL;
584 
585 	list_for_each(entry, &phy_drivers) {
586 		drv = list_entry(entry, struct phy_driver, list);
587 		if ((drv->uid & drv->mask) == (phy_id & drv->mask))
588 			return drv;
589 	}
590 
591 	/* If we made it here, there's no driver for this PHY */
592 	return generic_for_interface(interface);
593 }
594 
595 static struct phy_device *phy_device_create(struct mii_dev *bus, int addr,
596 					    u32 phy_id,
597 					    phy_interface_t interface)
598 {
599 	struct phy_device *dev;
600 
601 	/* We allocate the device, and initialize the
602 	 * default values */
603 	dev = malloc(sizeof(*dev));
604 	if (!dev) {
605 		printf("Failed to allocate PHY device for %s:%d\n",
606 			bus->name, addr);
607 		return NULL;
608 	}
609 
610 	memset(dev, 0, sizeof(*dev));
611 
612 	dev->duplex = -1;
613 	dev->link = 0;
614 	dev->interface = interface;
615 
616 	dev->autoneg = AUTONEG_ENABLE;
617 
618 	dev->addr = addr;
619 	dev->phy_id = phy_id;
620 	dev->bus = bus;
621 
622 	dev->drv = get_phy_driver(dev, interface);
623 
624 	phy_probe(dev);
625 
626 	bus->phymap[addr] = dev;
627 
628 	return dev;
629 }
630 
631 /**
632  * get_phy_id - reads the specified addr for its ID.
633  * @bus: the target MII bus
634  * @addr: PHY address on the MII bus
635  * @phy_id: where to store the ID retrieved.
636  *
637  * Description: Reads the ID registers of the PHY at @addr on the
638  *   @bus, stores it in @phy_id and returns zero on success.
639  */
640 int __weak get_phy_id(struct mii_dev *bus, int addr, int devad, u32 *phy_id)
641 {
642 	int phy_reg;
643 
644 	/* Grab the bits from PHYIR1, and put them
645 	 * in the upper half */
646 	phy_reg = bus->read(bus, addr, devad, MII_PHYSID1);
647 
648 	if (phy_reg < 0)
649 		return -EIO;
650 
651 	*phy_id = (phy_reg & 0xffff) << 16;
652 
653 	/* Grab the bits from PHYIR2, and put them in the lower half */
654 	phy_reg = bus->read(bus, addr, devad, MII_PHYSID2);
655 
656 	if (phy_reg < 0)
657 		return -EIO;
658 
659 	*phy_id |= (phy_reg & 0xffff);
660 
661 	return 0;
662 }
663 
664 static struct phy_device *create_phy_by_mask(struct mii_dev *bus,
665 		unsigned phy_mask, int devad, phy_interface_t interface)
666 {
667 	u32 phy_id = 0xffffffff;
668 	while (phy_mask) {
669 		int addr = ffs(phy_mask) - 1;
670 		int r = get_phy_id(bus, addr, devad, &phy_id);
671 		/* If the PHY ID is mostly f's, we didn't find anything */
672 		if (r == 0 && (phy_id & 0x1fffffff) != 0x1fffffff)
673 			return phy_device_create(bus, addr, phy_id, interface);
674 		phy_mask &= ~(1 << addr);
675 	}
676 	return NULL;
677 }
678 
679 static struct phy_device *search_for_existing_phy(struct mii_dev *bus,
680 		unsigned phy_mask, phy_interface_t interface)
681 {
682 	/* If we have one, return the existing device, with new interface */
683 	while (phy_mask) {
684 		int addr = ffs(phy_mask) - 1;
685 		if (bus->phymap[addr]) {
686 			bus->phymap[addr]->interface = interface;
687 			return bus->phymap[addr];
688 		}
689 		phy_mask &= ~(1 << addr);
690 	}
691 	return NULL;
692 }
693 
694 static struct phy_device *get_phy_device_by_mask(struct mii_dev *bus,
695 		unsigned phy_mask, phy_interface_t interface)
696 {
697 	int i;
698 	struct phy_device *phydev;
699 
700 	phydev = search_for_existing_phy(bus, phy_mask, interface);
701 	if (phydev)
702 		return phydev;
703 	/* Try Standard (ie Clause 22) access */
704 	/* Otherwise we have to try Clause 45 */
705 	for (i = 0; i < 5; i++) {
706 		phydev = create_phy_by_mask(bus, phy_mask,
707 				i ? i : MDIO_DEVAD_NONE, interface);
708 		if (IS_ERR(phydev))
709 			return NULL;
710 		if (phydev)
711 			return phydev;
712 	}
713 
714 	debug("\n%s PHY: ", bus->name);
715 	while (phy_mask) {
716 		int addr = ffs(phy_mask) - 1;
717 		debug("%d ", addr);
718 		phy_mask &= ~(1 << addr);
719 	}
720 	debug("not found\n");
721 
722 	return NULL;
723 }
724 
725 /**
726  * get_phy_device - reads the specified PHY device and returns its @phy_device struct
727  * @bus: the target MII bus
728  * @addr: PHY address on the MII bus
729  *
730  * Description: Reads the ID registers of the PHY at @addr on the
731  *   @bus, then allocates and returns the phy_device to represent it.
732  */
733 static struct phy_device *get_phy_device(struct mii_dev *bus, int addr,
734 					 phy_interface_t interface)
735 {
736 	return get_phy_device_by_mask(bus, 1 << addr, interface);
737 }
738 
739 int phy_reset(struct phy_device *phydev)
740 {
741 	int reg;
742 	int timeout = 500;
743 	int devad = MDIO_DEVAD_NONE;
744 
745 #ifdef CONFIG_PHYLIB_10G
746 	/* If it's 10G, we need to issue reset through one of the MMDs */
747 	if (is_10g_interface(phydev->interface)) {
748 		if (!phydev->mmds)
749 			gen10g_discover_mmds(phydev);
750 
751 		devad = ffs(phydev->mmds) - 1;
752 	}
753 #endif
754 
755 	if (phy_write(phydev, devad, MII_BMCR, BMCR_RESET) < 0) {
756 		debug("PHY reset failed\n");
757 		return -1;
758 	}
759 
760 #ifdef CONFIG_PHY_RESET_DELAY
761 	udelay(CONFIG_PHY_RESET_DELAY);	/* Intel LXT971A needs this */
762 #endif
763 	/*
764 	 * Poll the control register for the reset bit to go to 0 (it is
765 	 * auto-clearing).  This should happen within 0.5 seconds per the
766 	 * IEEE spec.
767 	 */
768 	reg = phy_read(phydev, devad, MII_BMCR);
769 	while ((reg & BMCR_RESET) && timeout--) {
770 		reg = phy_read(phydev, devad, MII_BMCR);
771 
772 		if (reg < 0) {
773 			debug("PHY status read failed\n");
774 			return -1;
775 		}
776 		udelay(1000);
777 	}
778 
779 	if (reg & BMCR_RESET) {
780 		puts("PHY reset timed out\n");
781 		return -1;
782 	}
783 
784 	return 0;
785 }
786 
787 int miiphy_reset(const char *devname, unsigned char addr)
788 {
789 	struct mii_dev *bus = miiphy_get_dev_by_name(devname);
790 	struct phy_device *phydev;
791 
792 	/*
793 	 * miiphy_reset was only used on standard PHYs, so we'll fake it here.
794 	 * If later code tries to connect with the right interface, this will
795 	 * be corrected by get_phy_device in phy_connect()
796 	 */
797 	phydev = get_phy_device(bus, addr, PHY_INTERFACE_MODE_MII);
798 
799 	return phy_reset(phydev);
800 }
801 
802 struct phy_device *phy_find_by_mask(struct mii_dev *bus, unsigned phy_mask,
803 		phy_interface_t interface)
804 {
805 	/* Reset the bus */
806 	if (bus->reset) {
807 		bus->reset(bus);
808 
809 		/* Wait 15ms to make sure the PHY has come out of hard reset */
810 		udelay(15000);
811 	}
812 
813 	return get_phy_device_by_mask(bus, phy_mask, interface);
814 }
815 
816 #ifdef CONFIG_DM_ETH
817 void phy_connect_dev(struct phy_device *phydev, struct udevice *dev)
818 #else
819 void phy_connect_dev(struct phy_device *phydev, struct eth_device *dev)
820 #endif
821 {
822 	/* Soft Reset the PHY */
823 	phy_reset(phydev);
824 	if (phydev->dev && phydev->dev != dev) {
825 		printf("%s:%d is connected to %s.  Reconnecting to %s\n",
826 				phydev->bus->name, phydev->addr,
827 				phydev->dev->name, dev->name);
828 	}
829 	phydev->dev = dev;
830 	debug("%s connected to %s\n", dev->name, phydev->drv->name);
831 }
832 
833 #ifdef CONFIG_DM_ETH
834 struct phy_device *phy_connect(struct mii_dev *bus, int addr,
835 		struct udevice *dev, phy_interface_t interface)
836 #else
837 struct phy_device *phy_connect(struct mii_dev *bus, int addr,
838 		struct eth_device *dev, phy_interface_t interface)
839 #endif
840 {
841 	struct phy_device *phydev;
842 
843 	phydev = phy_find_by_mask(bus, 1 << addr, interface);
844 	if (phydev)
845 		phy_connect_dev(phydev, dev);
846 	else
847 		printf("Could not get PHY for %s: addr %d\n", bus->name, addr);
848 	return phydev;
849 }
850 
851 /*
852  * Start the PHY.  Returns 0 on success, or a negative error code.
853  */
854 int phy_startup(struct phy_device *phydev)
855 {
856 	if (phydev->drv->startup)
857 		return phydev->drv->startup(phydev);
858 
859 	return 0;
860 }
861 
862 __weak int board_phy_config(struct phy_device *phydev)
863 {
864 	if (phydev->drv->config)
865 		return phydev->drv->config(phydev);
866 	return 0;
867 }
868 
869 int phy_config(struct phy_device *phydev)
870 {
871 	/* Invoke an optional board-specific helper */
872 	board_phy_config(phydev);
873 
874 	return 0;
875 }
876 
877 int phy_shutdown(struct phy_device *phydev)
878 {
879 	if (phydev->drv->shutdown)
880 		phydev->drv->shutdown(phydev);
881 
882 	return 0;
883 }
884 
885 int phy_get_interface_by_name(const char *str)
886 {
887 	int i;
888 
889 	for (i = 0; i < PHY_INTERFACE_MODE_COUNT; i++) {
890 		if (!strcmp(str, phy_interface_strings[i]))
891 			return i;
892 	}
893 
894 	return -1;
895 }
896