xref: /openbmc/u-boot/drivers/net/phy/phy.c (revision 2f6ed3b8)
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 = BMCR_ANRESTART;
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 ((phydev->autoneg == AUTONEG_ENABLE) &&
239 	    !(mii_reg & BMSR_ANEGCOMPLETE)) {
240 		int i = 0;
241 
242 		printf("%s Waiting for PHY auto negotiation to complete",
243 			phydev->dev->name);
244 		while (!(mii_reg & BMSR_ANEGCOMPLETE)) {
245 			/*
246 			 * Timeout reached ?
247 			 */
248 			if (i > PHY_ANEG_TIMEOUT) {
249 				printf(" TIMEOUT !\n");
250 				phydev->link = 0;
251 				return 0;
252 			}
253 
254 			if (ctrlc()) {
255 				puts("user interrupt!\n");
256 				phydev->link = 0;
257 				return -EINTR;
258 			}
259 
260 			if ((i++ % 500) == 0)
261 				printf(".");
262 
263 			udelay(1000);	/* 1 ms */
264 			mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
265 		}
266 		printf(" done\n");
267 		phydev->link = 1;
268 	} else {
269 		/* Read the link a second time to clear the latched state */
270 		mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
271 
272 		if (mii_reg & BMSR_LSTATUS)
273 			phydev->link = 1;
274 		else
275 			phydev->link = 0;
276 	}
277 
278 	return 0;
279 }
280 
281 /*
282  * Generic function which updates the speed and duplex.  If
283  * autonegotiation is enabled, it uses the AND of the link
284  * partner's advertised capabilities and our advertised
285  * capabilities.  If autonegotiation is disabled, we use the
286  * appropriate bits in the control register.
287  *
288  * Stolen from Linux's mii.c and phy_device.c
289  */
290 int genphy_parse_link(struct phy_device *phydev)
291 {
292 	int mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
293 
294 	/* We're using autonegotiation */
295 	if (phydev->autoneg == AUTONEG_ENABLE) {
296 		u32 lpa = 0;
297 		int gblpa = 0;
298 		u32 estatus = 0;
299 
300 		/* Check for gigabit capability */
301 		if (phydev->supported & (SUPPORTED_1000baseT_Full |
302 					SUPPORTED_1000baseT_Half)) {
303 			/* We want a list of states supported by
304 			 * both PHYs in the link
305 			 */
306 			gblpa = phy_read(phydev, MDIO_DEVAD_NONE, MII_STAT1000);
307 			if (gblpa < 0) {
308 				debug("Could not read MII_STAT1000. Ignoring gigabit capability\n");
309 				gblpa = 0;
310 			}
311 			gblpa &= phy_read(phydev,
312 					MDIO_DEVAD_NONE, MII_CTRL1000) << 2;
313 		}
314 
315 		/* Set the baseline so we only have to set them
316 		 * if they're different
317 		 */
318 		phydev->speed = SPEED_10;
319 		phydev->duplex = DUPLEX_HALF;
320 
321 		/* Check the gigabit fields */
322 		if (gblpa & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD)) {
323 			phydev->speed = SPEED_1000;
324 
325 			if (gblpa & PHY_1000BTSR_1000FD)
326 				phydev->duplex = DUPLEX_FULL;
327 
328 			/* We're done! */
329 			return 0;
330 		}
331 
332 		lpa = phy_read(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE);
333 		lpa &= phy_read(phydev, MDIO_DEVAD_NONE, MII_LPA);
334 
335 		if (lpa & (LPA_100FULL | LPA_100HALF)) {
336 			phydev->speed = SPEED_100;
337 
338 			if (lpa & LPA_100FULL)
339 				phydev->duplex = DUPLEX_FULL;
340 
341 		} else if (lpa & LPA_10FULL)
342 			phydev->duplex = DUPLEX_FULL;
343 
344 		/*
345 		 * Extended status may indicate that the PHY supports
346 		 * 1000BASE-T/X even though the 1000BASE-T registers
347 		 * are missing. In this case we can't tell whether the
348 		 * peer also supports it, so we only check extended
349 		 * status if the 1000BASE-T registers are actually
350 		 * missing.
351 		 */
352 		if ((mii_reg & BMSR_ESTATEN) && !(mii_reg & BMSR_ERCAP))
353 			estatus = phy_read(phydev, MDIO_DEVAD_NONE,
354 					   MII_ESTATUS);
355 
356 		if (estatus & (ESTATUS_1000_XFULL | ESTATUS_1000_XHALF |
357 				ESTATUS_1000_TFULL | ESTATUS_1000_THALF)) {
358 			phydev->speed = SPEED_1000;
359 			if (estatus & (ESTATUS_1000_XFULL | ESTATUS_1000_TFULL))
360 				phydev->duplex = DUPLEX_FULL;
361 		}
362 
363 	} else {
364 		u32 bmcr = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
365 
366 		phydev->speed = SPEED_10;
367 		phydev->duplex = DUPLEX_HALF;
368 
369 		if (bmcr & BMCR_FULLDPLX)
370 			phydev->duplex = DUPLEX_FULL;
371 
372 		if (bmcr & BMCR_SPEED1000)
373 			phydev->speed = SPEED_1000;
374 		else if (bmcr & BMCR_SPEED100)
375 			phydev->speed = SPEED_100;
376 	}
377 
378 	return 0;
379 }
380 
381 int genphy_config(struct phy_device *phydev)
382 {
383 	int val;
384 	u32 features;
385 
386 	features = (SUPPORTED_TP | SUPPORTED_MII
387 			| SUPPORTED_AUI | SUPPORTED_FIBRE |
388 			SUPPORTED_BNC);
389 
390 	/* Do we support autonegotiation? */
391 	val = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
392 
393 	if (val < 0)
394 		return val;
395 
396 	if (val & BMSR_ANEGCAPABLE)
397 		features |= SUPPORTED_Autoneg;
398 
399 	if (val & BMSR_100FULL)
400 		features |= SUPPORTED_100baseT_Full;
401 	if (val & BMSR_100HALF)
402 		features |= SUPPORTED_100baseT_Half;
403 	if (val & BMSR_10FULL)
404 		features |= SUPPORTED_10baseT_Full;
405 	if (val & BMSR_10HALF)
406 		features |= SUPPORTED_10baseT_Half;
407 
408 	if (val & BMSR_ESTATEN) {
409 		val = phy_read(phydev, MDIO_DEVAD_NONE, MII_ESTATUS);
410 
411 		if (val < 0)
412 			return val;
413 
414 		if (val & ESTATUS_1000_TFULL)
415 			features |= SUPPORTED_1000baseT_Full;
416 		if (val & ESTATUS_1000_THALF)
417 			features |= SUPPORTED_1000baseT_Half;
418 		if (val & ESTATUS_1000_XFULL)
419 			features |= SUPPORTED_1000baseX_Full;
420 		if (val & ESTATUS_1000_XHALF)
421 			features |= SUPPORTED_1000baseX_Half;
422 	}
423 
424 	phydev->supported &= features;
425 	phydev->advertising &= features;
426 
427 	genphy_config_aneg(phydev);
428 
429 	return 0;
430 }
431 
432 int genphy_startup(struct phy_device *phydev)
433 {
434 	genphy_update_link(phydev);
435 	genphy_parse_link(phydev);
436 
437 	return 0;
438 }
439 
440 int genphy_shutdown(struct phy_device *phydev)
441 {
442 	return 0;
443 }
444 
445 static struct phy_driver genphy_driver = {
446 	.uid		= 0xffffffff,
447 	.mask		= 0xffffffff,
448 	.name		= "Generic PHY",
449 	.features	= PHY_GBIT_FEATURES | SUPPORTED_MII |
450 			  SUPPORTED_AUI | SUPPORTED_FIBRE |
451 			  SUPPORTED_BNC,
452 	.config		= genphy_config,
453 	.startup	= genphy_startup,
454 	.shutdown	= genphy_shutdown,
455 };
456 
457 static LIST_HEAD(phy_drivers);
458 
459 int phy_init(void)
460 {
461 #ifdef CONFIG_PHY_AQUANTIA
462 	phy_aquantia_init();
463 #endif
464 #ifdef CONFIG_PHY_ATHEROS
465 	phy_atheros_init();
466 #endif
467 #ifdef CONFIG_PHY_BROADCOM
468 	phy_broadcom_init();
469 #endif
470 #ifdef CONFIG_PHY_CORTINA
471 	phy_cortina_init();
472 #endif
473 #ifdef CONFIG_PHY_DAVICOM
474 	phy_davicom_init();
475 #endif
476 #ifdef CONFIG_PHY_ET1011C
477 	phy_et1011c_init();
478 #endif
479 #ifdef CONFIG_PHY_LXT
480 	phy_lxt_init();
481 #endif
482 #ifdef CONFIG_PHY_MARVELL
483 	phy_marvell_init();
484 #endif
485 #ifdef CONFIG_PHY_MICREL
486 	phy_micrel_init();
487 #endif
488 #ifdef CONFIG_PHY_NATSEMI
489 	phy_natsemi_init();
490 #endif
491 #ifdef CONFIG_PHY_REALTEK
492 	phy_realtek_init();
493 #endif
494 #ifdef CONFIG_PHY_SMSC
495 	phy_smsc_init();
496 #endif
497 #ifdef CONFIG_PHY_TERANETICS
498 	phy_teranetics_init();
499 #endif
500 #ifdef CONFIG_PHY_TI
501 	phy_ti_init();
502 #endif
503 #ifdef CONFIG_PHY_VITESSE
504 	phy_vitesse_init();
505 #endif
506 
507 	return 0;
508 }
509 
510 int phy_register(struct phy_driver *drv)
511 {
512 	INIT_LIST_HEAD(&drv->list);
513 	list_add_tail(&drv->list, &phy_drivers);
514 
515 #ifdef CONFIG_NEEDS_MANUAL_RELOC
516 	if (drv->probe)
517 		drv->probe += gd->reloc_off;
518 	if (drv->config)
519 		drv->config += gd->reloc_off;
520 	if (drv->startup)
521 		drv->startup += gd->reloc_off;
522 	if (drv->shutdown)
523 		drv->shutdown += gd->reloc_off;
524 	if (drv->readext)
525 		drv->readext += gd->reloc_off;
526 	if (drv->writeext)
527 		drv->writeext += gd->reloc_off;
528 #endif
529 	return 0;
530 }
531 
532 int phy_set_supported(struct phy_device *phydev, u32 max_speed)
533 {
534 	/* The default values for phydev->supported are provided by the PHY
535 	 * driver "features" member, we want to reset to sane defaults first
536 	 * before supporting higher speeds.
537 	 */
538 	phydev->supported &= PHY_DEFAULT_FEATURES;
539 
540 	switch (max_speed) {
541 	default:
542 		return -ENOTSUPP;
543 	case SPEED_1000:
544 		phydev->supported |= PHY_1000BT_FEATURES;
545 		/* fall through */
546 	case SPEED_100:
547 		phydev->supported |= PHY_100BT_FEATURES;
548 		/* fall through */
549 	case SPEED_10:
550 		phydev->supported |= PHY_10BT_FEATURES;
551 	}
552 
553 	return 0;
554 }
555 
556 static int phy_probe(struct phy_device *phydev)
557 {
558 	int err = 0;
559 
560 	phydev->advertising = phydev->supported = phydev->drv->features;
561 	phydev->mmds = phydev->drv->mmds;
562 
563 	if (phydev->drv->probe)
564 		err = phydev->drv->probe(phydev);
565 
566 	return err;
567 }
568 
569 static struct phy_driver *generic_for_interface(phy_interface_t interface)
570 {
571 #ifdef CONFIG_PHYLIB_10G
572 	if (is_10g_interface(interface))
573 		return &gen10g_driver;
574 #endif
575 
576 	return &genphy_driver;
577 }
578 
579 static struct phy_driver *get_phy_driver(struct phy_device *phydev,
580 				phy_interface_t interface)
581 {
582 	struct list_head *entry;
583 	int phy_id = phydev->phy_id;
584 	struct phy_driver *drv = NULL;
585 
586 	list_for_each(entry, &phy_drivers) {
587 		drv = list_entry(entry, struct phy_driver, list);
588 		if ((drv->uid & drv->mask) == (phy_id & drv->mask))
589 			return drv;
590 	}
591 
592 	/* If we made it here, there's no driver for this PHY */
593 	return generic_for_interface(interface);
594 }
595 
596 static struct phy_device *phy_device_create(struct mii_dev *bus, int addr,
597 					    u32 phy_id,
598 					    phy_interface_t interface)
599 {
600 	struct phy_device *dev;
601 
602 	/* We allocate the device, and initialize the
603 	 * default values */
604 	dev = malloc(sizeof(*dev));
605 	if (!dev) {
606 		printf("Failed to allocate PHY device for %s:%d\n",
607 			bus->name, addr);
608 		return NULL;
609 	}
610 
611 	memset(dev, 0, sizeof(*dev));
612 
613 	dev->duplex = -1;
614 	dev->link = 0;
615 	dev->interface = interface;
616 
617 	dev->autoneg = AUTONEG_ENABLE;
618 
619 	dev->addr = addr;
620 	dev->phy_id = phy_id;
621 	dev->bus = bus;
622 
623 	dev->drv = get_phy_driver(dev, interface);
624 
625 	phy_probe(dev);
626 
627 	bus->phymap[addr] = dev;
628 
629 	return dev;
630 }
631 
632 /**
633  * get_phy_id - reads the specified addr for its ID.
634  * @bus: the target MII bus
635  * @addr: PHY address on the MII bus
636  * @phy_id: where to store the ID retrieved.
637  *
638  * Description: Reads the ID registers of the PHY at @addr on the
639  *   @bus, stores it in @phy_id and returns zero on success.
640  */
641 int __weak get_phy_id(struct mii_dev *bus, int addr, int devad, u32 *phy_id)
642 {
643 	int phy_reg;
644 
645 	/* Grab the bits from PHYIR1, and put them
646 	 * in the upper half */
647 	phy_reg = bus->read(bus, addr, devad, MII_PHYSID1);
648 
649 	if (phy_reg < 0)
650 		return -EIO;
651 
652 	*phy_id = (phy_reg & 0xffff) << 16;
653 
654 	/* Grab the bits from PHYIR2, and put them in the lower half */
655 	phy_reg = bus->read(bus, addr, devad, MII_PHYSID2);
656 
657 	if (phy_reg < 0)
658 		return -EIO;
659 
660 	*phy_id |= (phy_reg & 0xffff);
661 
662 	return 0;
663 }
664 
665 static struct phy_device *create_phy_by_mask(struct mii_dev *bus,
666 		unsigned phy_mask, int devad, phy_interface_t interface)
667 {
668 	u32 phy_id = 0xffffffff;
669 	while (phy_mask) {
670 		int addr = ffs(phy_mask) - 1;
671 		int r = get_phy_id(bus, addr, devad, &phy_id);
672 		/* If the PHY ID is mostly f's, we didn't find anything */
673 		if (r == 0 && (phy_id & 0x1fffffff) != 0x1fffffff)
674 			return phy_device_create(bus, addr, phy_id, interface);
675 		phy_mask &= ~(1 << addr);
676 	}
677 	return NULL;
678 }
679 
680 static struct phy_device *search_for_existing_phy(struct mii_dev *bus,
681 		unsigned phy_mask, phy_interface_t interface)
682 {
683 	/* If we have one, return the existing device, with new interface */
684 	while (phy_mask) {
685 		int addr = ffs(phy_mask) - 1;
686 		if (bus->phymap[addr]) {
687 			bus->phymap[addr]->interface = interface;
688 			return bus->phymap[addr];
689 		}
690 		phy_mask &= ~(1 << addr);
691 	}
692 	return NULL;
693 }
694 
695 static struct phy_device *get_phy_device_by_mask(struct mii_dev *bus,
696 		unsigned phy_mask, phy_interface_t interface)
697 {
698 	int i;
699 	struct phy_device *phydev;
700 
701 	phydev = search_for_existing_phy(bus, phy_mask, interface);
702 	if (phydev)
703 		return phydev;
704 	/* Try Standard (ie Clause 22) access */
705 	/* Otherwise we have to try Clause 45 */
706 	for (i = 0; i < 5; i++) {
707 		phydev = create_phy_by_mask(bus, phy_mask,
708 				i ? i : MDIO_DEVAD_NONE, interface);
709 		if (IS_ERR(phydev))
710 			return NULL;
711 		if (phydev)
712 			return phydev;
713 	}
714 
715 	debug("\n%s PHY: ", bus->name);
716 	while (phy_mask) {
717 		int addr = ffs(phy_mask) - 1;
718 		debug("%d ", addr);
719 		phy_mask &= ~(1 << addr);
720 	}
721 	debug("not found\n");
722 
723 	return NULL;
724 }
725 
726 /**
727  * get_phy_device - reads the specified PHY device and returns its @phy_device struct
728  * @bus: the target MII bus
729  * @addr: PHY address on the MII bus
730  *
731  * Description: Reads the ID registers of the PHY at @addr on the
732  *   @bus, then allocates and returns the phy_device to represent it.
733  */
734 static struct phy_device *get_phy_device(struct mii_dev *bus, int addr,
735 					 phy_interface_t interface)
736 {
737 	return get_phy_device_by_mask(bus, 1 << addr, interface);
738 }
739 
740 int phy_reset(struct phy_device *phydev)
741 {
742 	int reg;
743 	int timeout = 500;
744 	int devad = MDIO_DEVAD_NONE;
745 
746 	if (phydev->flags & PHY_FLAG_BROKEN_RESET)
747 		return 0;
748 
749 #ifdef CONFIG_PHYLIB_10G
750 	/* If it's 10G, we need to issue reset through one of the MMDs */
751 	if (is_10g_interface(phydev->interface)) {
752 		if (!phydev->mmds)
753 			gen10g_discover_mmds(phydev);
754 
755 		devad = ffs(phydev->mmds) - 1;
756 	}
757 #endif
758 
759 	if (phy_write(phydev, devad, MII_BMCR, BMCR_RESET) < 0) {
760 		debug("PHY reset failed\n");
761 		return -1;
762 	}
763 
764 #ifdef CONFIG_PHY_RESET_DELAY
765 	udelay(CONFIG_PHY_RESET_DELAY);	/* Intel LXT971A needs this */
766 #endif
767 	/*
768 	 * Poll the control register for the reset bit to go to 0 (it is
769 	 * auto-clearing).  This should happen within 0.5 seconds per the
770 	 * IEEE spec.
771 	 */
772 	reg = phy_read(phydev, devad, MII_BMCR);
773 	while ((reg & BMCR_RESET) && timeout--) {
774 		reg = phy_read(phydev, devad, MII_BMCR);
775 
776 		if (reg < 0) {
777 			debug("PHY status read failed\n");
778 			return -1;
779 		}
780 		udelay(1000);
781 	}
782 
783 	if (reg & BMCR_RESET) {
784 		puts("PHY reset timed out\n");
785 		return -1;
786 	}
787 
788 	return 0;
789 }
790 
791 int miiphy_reset(const char *devname, unsigned char addr)
792 {
793 	struct mii_dev *bus = miiphy_get_dev_by_name(devname);
794 	struct phy_device *phydev;
795 
796 	/*
797 	 * miiphy_reset was only used on standard PHYs, so we'll fake it here.
798 	 * If later code tries to connect with the right interface, this will
799 	 * be corrected by get_phy_device in phy_connect()
800 	 */
801 	phydev = get_phy_device(bus, addr, PHY_INTERFACE_MODE_MII);
802 
803 	return phy_reset(phydev);
804 }
805 
806 struct phy_device *phy_find_by_mask(struct mii_dev *bus, unsigned phy_mask,
807 		phy_interface_t interface)
808 {
809 	/* Reset the bus */
810 	if (bus->reset) {
811 		bus->reset(bus);
812 
813 		/* Wait 15ms to make sure the PHY has come out of hard reset */
814 		udelay(15000);
815 	}
816 
817 	return get_phy_device_by_mask(bus, phy_mask, interface);
818 }
819 
820 #ifdef CONFIG_DM_ETH
821 void phy_connect_dev(struct phy_device *phydev, struct udevice *dev)
822 #else
823 void phy_connect_dev(struct phy_device *phydev, struct eth_device *dev)
824 #endif
825 {
826 	/* Soft Reset the PHY */
827 	phy_reset(phydev);
828 	if (phydev->dev && phydev->dev != dev) {
829 		printf("%s:%d is connected to %s.  Reconnecting to %s\n",
830 				phydev->bus->name, phydev->addr,
831 				phydev->dev->name, dev->name);
832 	}
833 	phydev->dev = dev;
834 	debug("%s connected to %s\n", dev->name, phydev->drv->name);
835 }
836 
837 #ifdef CONFIG_DM_ETH
838 struct phy_device *phy_connect(struct mii_dev *bus, int addr,
839 		struct udevice *dev, phy_interface_t interface)
840 #else
841 struct phy_device *phy_connect(struct mii_dev *bus, int addr,
842 		struct eth_device *dev, phy_interface_t interface)
843 #endif
844 {
845 	struct phy_device *phydev;
846 
847 	phydev = phy_find_by_mask(bus, 1 << addr, interface);
848 	if (phydev)
849 		phy_connect_dev(phydev, dev);
850 	else
851 		printf("Could not get PHY for %s: addr %d\n", bus->name, addr);
852 	return phydev;
853 }
854 
855 /*
856  * Start the PHY.  Returns 0 on success, or a negative error code.
857  */
858 int phy_startup(struct phy_device *phydev)
859 {
860 	if (phydev->drv->startup)
861 		return phydev->drv->startup(phydev);
862 
863 	return 0;
864 }
865 
866 __weak int board_phy_config(struct phy_device *phydev)
867 {
868 	if (phydev->drv->config)
869 		return phydev->drv->config(phydev);
870 	return 0;
871 }
872 
873 int phy_config(struct phy_device *phydev)
874 {
875 	/* Invoke an optional board-specific helper */
876 	board_phy_config(phydev);
877 
878 	return 0;
879 }
880 
881 int phy_shutdown(struct phy_device *phydev)
882 {
883 	if (phydev->drv->shutdown)
884 		phydev->drv->shutdown(phydev);
885 
886 	return 0;
887 }
888 
889 int phy_get_interface_by_name(const char *str)
890 {
891 	int i;
892 
893 	for (i = 0; i < PHY_INTERFACE_MODE_COUNT; i++) {
894 		if (!strcmp(str, phy_interface_strings[i]))
895 			return i;
896 	}
897 
898 	return -1;
899 }
900