xref: /openbmc/u-boot/common/miiphyutil.c (revision 83bf0057) 
1 /*
2  * (C) Copyright 2001
3  * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
4  *
5  * SPDX-License-Identifier:	GPL-2.0+
6  */
7 
8 /*
9  * This provides a bit-banged interface to the ethernet MII management
10  * channel.
11  */
12 
13 #include <common.h>
14 #include <dm.h>
15 #include <miiphy.h>
16 #include <phy.h>
17 
18 #include <asm/types.h>
19 #include <linux/list.h>
20 #include <malloc.h>
21 #include <net.h>
22 
23 /* local debug macro */
24 #undef MII_DEBUG
25 
26 #undef debug
27 #ifdef MII_DEBUG
28 #define debug(fmt, args...)	printf(fmt, ##args)
29 #else
30 #define debug(fmt, args...)
31 #endif /* MII_DEBUG */
32 
33 static struct list_head mii_devs;
34 static struct mii_dev *current_mii;
35 
36 /*
37  * Lookup the mii_dev struct by the registered device name.
38  */
39 struct mii_dev *miiphy_get_dev_by_name(const char *devname)
40 {
41 	struct list_head *entry;
42 	struct mii_dev *dev;
43 
44 	if (!devname) {
45 		printf("NULL device name!\n");
46 		return NULL;
47 	}
48 
49 	list_for_each(entry, &mii_devs) {
50 		dev = list_entry(entry, struct mii_dev, link);
51 		if (strcmp(dev->name, devname) == 0)
52 			return dev;
53 	}
54 
55 	return NULL;
56 }
57 
58 /*****************************************************************************
59  *
60  * Initialize global data. Need to be called before any other miiphy routine.
61  */
62 void miiphy_init(void)
63 {
64 	INIT_LIST_HEAD(&mii_devs);
65 	current_mii = NULL;
66 }
67 
68 static int legacy_miiphy_read(struct mii_dev *bus, int addr, int devad, int reg)
69 {
70 	unsigned short val;
71 	int ret;
72 	struct legacy_mii_dev *ldev = bus->priv;
73 
74 	ret = ldev->read(bus->name, addr, reg, &val);
75 
76 	return ret ? -1 : (int)val;
77 }
78 
79 static int legacy_miiphy_write(struct mii_dev *bus, int addr, int devad,
80 				int reg, u16 val)
81 {
82 	struct legacy_mii_dev *ldev = bus->priv;
83 
84 	return ldev->write(bus->name, addr, reg, val);
85 }
86 
87 /*****************************************************************************
88  *
89  * Register read and write MII access routines for the device <name>.
90  * This API is now deprecated. Please use mdio_alloc and mdio_register, instead.
91  */
92 void miiphy_register(const char *name,
93 		      int (*read)(const char *devname, unsigned char addr,
94 				   unsigned char reg, unsigned short *value),
95 		      int (*write)(const char *devname, unsigned char addr,
96 				    unsigned char reg, unsigned short value))
97 {
98 	struct mii_dev *new_dev;
99 	struct legacy_mii_dev *ldev;
100 
101 	BUG_ON(strlen(name) >= MDIO_NAME_LEN);
102 
103 	/* check if we have unique name */
104 	new_dev = miiphy_get_dev_by_name(name);
105 	if (new_dev) {
106 		printf("miiphy_register: non unique device name '%s'\n", name);
107 		return;
108 	}
109 
110 	/* allocate memory */
111 	new_dev = mdio_alloc();
112 	ldev = malloc(sizeof(*ldev));
113 
114 	if (new_dev == NULL || ldev == NULL) {
115 		printf("miiphy_register: cannot allocate memory for '%s'\n",
116 			name);
117 		return;
118 	}
119 
120 	/* initalize mii_dev struct fields */
121 	new_dev->read = legacy_miiphy_read;
122 	new_dev->write = legacy_miiphy_write;
123 	strncpy(new_dev->name, name, MDIO_NAME_LEN);
124 	new_dev->name[MDIO_NAME_LEN - 1] = 0;
125 	ldev->read = read;
126 	ldev->write = write;
127 	new_dev->priv = ldev;
128 
129 	debug("miiphy_register: added '%s', read=0x%08lx, write=0x%08lx\n",
130 	       new_dev->name, ldev->read, ldev->write);
131 
132 	/* add it to the list */
133 	list_add_tail(&new_dev->link, &mii_devs);
134 
135 	if (!current_mii)
136 		current_mii = new_dev;
137 }
138 
139 struct mii_dev *mdio_alloc(void)
140 {
141 	struct mii_dev *bus;
142 
143 	bus = malloc(sizeof(*bus));
144 	if (!bus)
145 		return bus;
146 
147 	memset(bus, 0, sizeof(*bus));
148 
149 	/* initalize mii_dev struct fields */
150 	INIT_LIST_HEAD(&bus->link);
151 
152 	return bus;
153 }
154 
155 void mdio_free(struct mii_dev *bus)
156 {
157 	free(bus);
158 }
159 
160 int mdio_register(struct mii_dev *bus)
161 {
162 	if (!bus || !bus->name || !bus->read || !bus->write)
163 		return -1;
164 
165 	/* check if we have unique name */
166 	if (miiphy_get_dev_by_name(bus->name)) {
167 		printf("mdio_register: non unique device name '%s'\n",
168 			bus->name);
169 		return -1;
170 	}
171 
172 	/* add it to the list */
173 	list_add_tail(&bus->link, &mii_devs);
174 
175 	if (!current_mii)
176 		current_mii = bus;
177 
178 	return 0;
179 }
180 
181 int mdio_unregister(struct mii_dev *bus)
182 {
183 	if (!bus)
184 		return 0;
185 
186 	/* delete it from the list */
187 	list_del(&bus->link);
188 
189 	if (current_mii == bus)
190 		current_mii = NULL;
191 
192 	return 0;
193 }
194 
195 void mdio_list_devices(void)
196 {
197 	struct list_head *entry;
198 
199 	list_for_each(entry, &mii_devs) {
200 		int i;
201 		struct mii_dev *bus = list_entry(entry, struct mii_dev, link);
202 
203 		printf("%s:\n", bus->name);
204 
205 		for (i = 0; i < PHY_MAX_ADDR; i++) {
206 			struct phy_device *phydev = bus->phymap[i];
207 
208 			if (phydev) {
209 				printf("%d - %s", i, phydev->drv->name);
210 
211 				if (phydev->dev)
212 					printf(" <--> %s\n", phydev->dev->name);
213 				else
214 					printf("\n");
215 			}
216 		}
217 	}
218 }
219 
220 int miiphy_set_current_dev(const char *devname)
221 {
222 	struct mii_dev *dev;
223 
224 	dev = miiphy_get_dev_by_name(devname);
225 	if (dev) {
226 		current_mii = dev;
227 		return 0;
228 	}
229 
230 	printf("No such device: %s\n", devname);
231 
232 	return 1;
233 }
234 
235 struct mii_dev *mdio_get_current_dev(void)
236 {
237 	return current_mii;
238 }
239 
240 struct phy_device *mdio_phydev_for_ethname(const char *ethname)
241 {
242 	struct list_head *entry;
243 	struct mii_dev *bus;
244 
245 	list_for_each(entry, &mii_devs) {
246 		int i;
247 		bus = list_entry(entry, struct mii_dev, link);
248 
249 		for (i = 0; i < PHY_MAX_ADDR; i++) {
250 			if (!bus->phymap[i] || !bus->phymap[i]->dev)
251 				continue;
252 
253 			if (strcmp(bus->phymap[i]->dev->name, ethname) == 0)
254 				return bus->phymap[i];
255 		}
256 	}
257 
258 	printf("%s is not a known ethernet\n", ethname);
259 	return NULL;
260 }
261 
262 const char *miiphy_get_current_dev(void)
263 {
264 	if (current_mii)
265 		return current_mii->name;
266 
267 	return NULL;
268 }
269 
270 static struct mii_dev *miiphy_get_active_dev(const char *devname)
271 {
272 	/* If the current mii is the one we want, return it */
273 	if (current_mii)
274 		if (strcmp(current_mii->name, devname) == 0)
275 			return current_mii;
276 
277 	/* Otherwise, set the active one to the one we want */
278 	if (miiphy_set_current_dev(devname))
279 		return NULL;
280 	else
281 		return current_mii;
282 }
283 
284 /*****************************************************************************
285  *
286  * Read to variable <value> from the PHY attached to device <devname>,
287  * use PHY address <addr> and register <reg>.
288  *
289  * This API is deprecated. Use phy_read on a phy_device found via phy_connect
290  *
291  * Returns:
292  *   0 on success
293  */
294 int miiphy_read(const char *devname, unsigned char addr, unsigned char reg,
295 		 unsigned short *value)
296 {
297 	struct mii_dev *bus;
298 	int ret;
299 
300 	bus = miiphy_get_active_dev(devname);
301 	if (!bus)
302 		return 1;
303 
304 	ret = bus->read(bus, addr, MDIO_DEVAD_NONE, reg);
305 	if (ret < 0)
306 		return 1;
307 
308 	*value = (unsigned short)ret;
309 	return 0;
310 }
311 
312 /*****************************************************************************
313  *
314  * Write <value> to the PHY attached to device <devname>,
315  * use PHY address <addr> and register <reg>.
316  *
317  * This API is deprecated. Use phy_write on a phy_device found by phy_connect
318  *
319  * Returns:
320  *   0 on success
321  */
322 int miiphy_write(const char *devname, unsigned char addr, unsigned char reg,
323 		  unsigned short value)
324 {
325 	struct mii_dev *bus;
326 
327 	bus = miiphy_get_active_dev(devname);
328 	if (bus)
329 		return bus->write(bus, addr, MDIO_DEVAD_NONE, reg, value);
330 
331 	return 1;
332 }
333 
334 /*****************************************************************************
335  *
336  * Print out list of registered MII capable devices.
337  */
338 void miiphy_listdev(void)
339 {
340 	struct list_head *entry;
341 	struct mii_dev *dev;
342 
343 	puts("MII devices: ");
344 	list_for_each(entry, &mii_devs) {
345 		dev = list_entry(entry, struct mii_dev, link);
346 		printf("'%s' ", dev->name);
347 	}
348 	puts("\n");
349 
350 	if (current_mii)
351 		printf("Current device: '%s'\n", current_mii->name);
352 }
353 
354 /*****************************************************************************
355  *
356  * Read the OUI, manufacture's model number, and revision number.
357  *
358  * OUI:     22 bits (unsigned int)
359  * Model:    6 bits (unsigned char)
360  * Revision: 4 bits (unsigned char)
361  *
362  * This API is deprecated.
363  *
364  * Returns:
365  *   0 on success
366  */
367 int miiphy_info(const char *devname, unsigned char addr, unsigned int *oui,
368 		 unsigned char *model, unsigned char *rev)
369 {
370 	unsigned int reg = 0;
371 	unsigned short tmp;
372 
373 	if (miiphy_read(devname, addr, MII_PHYSID2, &tmp) != 0) {
374 		debug("PHY ID register 2 read failed\n");
375 		return -1;
376 	}
377 	reg = tmp;
378 
379 	debug("MII_PHYSID2 @ 0x%x = 0x%04x\n", addr, reg);
380 
381 	if (reg == 0xFFFF) {
382 		/* No physical device present at this address */
383 		return -1;
384 	}
385 
386 	if (miiphy_read(devname, addr, MII_PHYSID1, &tmp) != 0) {
387 		debug("PHY ID register 1 read failed\n");
388 		return -1;
389 	}
390 	reg |= tmp << 16;
391 	debug("PHY_PHYIDR[1,2] @ 0x%x = 0x%08x\n", addr, reg);
392 
393 	*oui = (reg >> 10);
394 	*model = (unsigned char)((reg >> 4) & 0x0000003F);
395 	*rev = (unsigned char)(reg & 0x0000000F);
396 	return 0;
397 }
398 
399 #ifndef CONFIG_PHYLIB
400 /*****************************************************************************
401  *
402  * Reset the PHY.
403  *
404  * This API is deprecated. Use PHYLIB.
405  *
406  * Returns:
407  *   0 on success
408  */
409 int miiphy_reset(const char *devname, unsigned char addr)
410 {
411 	unsigned short reg;
412 	int timeout = 500;
413 
414 	if (miiphy_read(devname, addr, MII_BMCR, &reg) != 0) {
415 		debug("PHY status read failed\n");
416 		return -1;
417 	}
418 	if (miiphy_write(devname, addr, MII_BMCR, reg | BMCR_RESET) != 0) {
419 		debug("PHY reset failed\n");
420 		return -1;
421 	}
422 #ifdef CONFIG_PHY_RESET_DELAY
423 	udelay(CONFIG_PHY_RESET_DELAY);	/* Intel LXT971A needs this */
424 #endif
425 	/*
426 	 * Poll the control register for the reset bit to go to 0 (it is
427 	 * auto-clearing).  This should happen within 0.5 seconds per the
428 	 * IEEE spec.
429 	 */
430 	reg = 0x8000;
431 	while (((reg & 0x8000) != 0) && timeout--) {
432 		if (miiphy_read(devname, addr, MII_BMCR, &reg) != 0) {
433 			debug("PHY status read failed\n");
434 			return -1;
435 		}
436 		udelay(1000);
437 	}
438 	if ((reg & 0x8000) == 0) {
439 		return 0;
440 	} else {
441 		puts("PHY reset timed out\n");
442 		return -1;
443 	}
444 	return 0;
445 }
446 #endif /* !PHYLIB */
447 
448 /*****************************************************************************
449  *
450  * Determine the ethernet speed (10/100/1000).  Return 10 on error.
451  */
452 int miiphy_speed(const char *devname, unsigned char addr)
453 {
454 	u16 bmcr, anlpar;
455 
456 #if defined(CONFIG_PHY_GIGE)
457 	u16 btsr;
458 
459 	/*
460 	 * Check for 1000BASE-X.  If it is supported, then assume that the speed
461 	 * is 1000.
462 	 */
463 	if (miiphy_is_1000base_x(devname, addr))
464 		return _1000BASET;
465 
466 	/*
467 	 * No 1000BASE-X, so assume 1000BASE-T/100BASE-TX/10BASE-T register set.
468 	 */
469 	/* Check for 1000BASE-T. */
470 	if (miiphy_read(devname, addr, MII_STAT1000, &btsr)) {
471 		printf("PHY 1000BT status");
472 		goto miiphy_read_failed;
473 	}
474 	if (btsr != 0xFFFF &&
475 			(btsr & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD)))
476 		return _1000BASET;
477 #endif /* CONFIG_PHY_GIGE */
478 
479 	/* Check Basic Management Control Register first. */
480 	if (miiphy_read(devname, addr, MII_BMCR, &bmcr)) {
481 		printf("PHY speed");
482 		goto miiphy_read_failed;
483 	}
484 	/* Check if auto-negotiation is on. */
485 	if (bmcr & BMCR_ANENABLE) {
486 		/* Get auto-negotiation results. */
487 		if (miiphy_read(devname, addr, MII_LPA, &anlpar)) {
488 			printf("PHY AN speed");
489 			goto miiphy_read_failed;
490 		}
491 		return (anlpar & LPA_100) ? _100BASET : _10BASET;
492 	}
493 	/* Get speed from basic control settings. */
494 	return (bmcr & BMCR_SPEED100) ? _100BASET : _10BASET;
495 
496 miiphy_read_failed:
497 	printf(" read failed, assuming 10BASE-T\n");
498 	return _10BASET;
499 }
500 
501 /*****************************************************************************
502  *
503  * Determine full/half duplex.  Return half on error.
504  */
505 int miiphy_duplex(const char *devname, unsigned char addr)
506 {
507 	u16 bmcr, anlpar;
508 
509 #if defined(CONFIG_PHY_GIGE)
510 	u16 btsr;
511 
512 	/* Check for 1000BASE-X. */
513 	if (miiphy_is_1000base_x(devname, addr)) {
514 		/* 1000BASE-X */
515 		if (miiphy_read(devname, addr, MII_LPA, &anlpar)) {
516 			printf("1000BASE-X PHY AN duplex");
517 			goto miiphy_read_failed;
518 		}
519 	}
520 	/*
521 	 * No 1000BASE-X, so assume 1000BASE-T/100BASE-TX/10BASE-T register set.
522 	 */
523 	/* Check for 1000BASE-T. */
524 	if (miiphy_read(devname, addr, MII_STAT1000, &btsr)) {
525 		printf("PHY 1000BT status");
526 		goto miiphy_read_failed;
527 	}
528 	if (btsr != 0xFFFF) {
529 		if (btsr & PHY_1000BTSR_1000FD) {
530 			return FULL;
531 		} else if (btsr & PHY_1000BTSR_1000HD) {
532 			return HALF;
533 		}
534 	}
535 #endif /* CONFIG_PHY_GIGE */
536 
537 	/* Check Basic Management Control Register first. */
538 	if (miiphy_read(devname, addr, MII_BMCR, &bmcr)) {
539 		puts("PHY duplex");
540 		goto miiphy_read_failed;
541 	}
542 	/* Check if auto-negotiation is on. */
543 	if (bmcr & BMCR_ANENABLE) {
544 		/* Get auto-negotiation results. */
545 		if (miiphy_read(devname, addr, MII_LPA, &anlpar)) {
546 			puts("PHY AN duplex");
547 			goto miiphy_read_failed;
548 		}
549 		return (anlpar & (LPA_10FULL | LPA_100FULL)) ?
550 		    FULL : HALF;
551 	}
552 	/* Get speed from basic control settings. */
553 	return (bmcr & BMCR_FULLDPLX) ? FULL : HALF;
554 
555 miiphy_read_failed:
556 	printf(" read failed, assuming half duplex\n");
557 	return HALF;
558 }
559 
560 /*****************************************************************************
561  *
562  * Return 1 if PHY supports 1000BASE-X, 0 if PHY supports 10BASE-T/100BASE-TX/
563  * 1000BASE-T, or on error.
564  */
565 int miiphy_is_1000base_x(const char *devname, unsigned char addr)
566 {
567 #if defined(CONFIG_PHY_GIGE)
568 	u16 exsr;
569 
570 	if (miiphy_read(devname, addr, MII_ESTATUS, &exsr)) {
571 		printf("PHY extended status read failed, assuming no "
572 			"1000BASE-X\n");
573 		return 0;
574 	}
575 	return 0 != (exsr & (ESTATUS_1000XF | ESTATUS_1000XH));
576 #else
577 	return 0;
578 #endif
579 }
580 
581 #ifdef CONFIG_SYS_FAULT_ECHO_LINK_DOWN
582 /*****************************************************************************
583  *
584  * Determine link status
585  */
586 int miiphy_link(const char *devname, unsigned char addr)
587 {
588 	unsigned short reg;
589 
590 	/* dummy read; needed to latch some phys */
591 	(void)miiphy_read(devname, addr, MII_BMSR, &reg);
592 	if (miiphy_read(devname, addr, MII_BMSR, &reg)) {
593 		puts("MII_BMSR read failed, assuming no link\n");
594 		return 0;
595 	}
596 
597 	/* Determine if a link is active */
598 	if ((reg & BMSR_LSTATUS) != 0) {
599 		return 1;
600 	} else {
601 		return 0;
602 	}
603 }
604 #endif
605