3 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
5 * SPDX-License-Identifier: GPL-2.0+
9 * This provides a bit-banged interface to the ethernet MII management
18 #include <asm/types.h>
19 #include <linux/list.h>
23 /* local debug macro */
28 #define debug(fmt, args...) printf(fmt, ##args)
30 #define debug(fmt, args...)
31 #endif /* MII_DEBUG */
33 static struct list_head mii_devs;
34 static struct mii_dev *current_mii;
37 * Lookup the mii_dev struct by the registered device name.
39 struct mii_dev *miiphy_get_dev_by_name(const char *devname)
41 struct list_head *entry;
45 printf("NULL device name!\n");
49 list_for_each(entry, &mii_devs) {
50 dev = list_entry(entry, struct mii_dev, link);
51 if (strcmp(dev->name, devname) == 0)
58 /*****************************************************************************
60 * Initialize global data. Need to be called before any other miiphy routine.
62 void miiphy_init(void)
64 INIT_LIST_HEAD(&mii_devs);
68 static int legacy_miiphy_read(struct mii_dev *bus, int addr, int devad, int reg)
72 struct legacy_mii_dev *ldev = bus->priv;
74 ret = ldev->read(bus->name, addr, reg, &val);
76 return ret ? -1 : (int)val;
79 static int legacy_miiphy_write(struct mii_dev *bus, int addr, int devad,
82 struct legacy_mii_dev *ldev = bus->priv;
84 return ldev->write(bus->name, addr, reg, val);
87 /*****************************************************************************
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.
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))
98 struct mii_dev *new_dev;
99 struct legacy_mii_dev *ldev;
101 BUG_ON(strlen(name) >= MDIO_NAME_LEN);
103 /* check if we have unique name */
104 new_dev = miiphy_get_dev_by_name(name);
106 printf("miiphy_register: non unique device name '%s'\n", name);
110 /* allocate memory */
111 new_dev = mdio_alloc();
112 ldev = malloc(sizeof(*ldev));
114 if (new_dev == NULL || ldev == NULL) {
115 printf("miiphy_register: cannot allocate memory for '%s'\n",
122 /* initalize mii_dev struct fields */
123 new_dev->read = legacy_miiphy_read;
124 new_dev->write = legacy_miiphy_write;
125 strncpy(new_dev->name, name, MDIO_NAME_LEN);
126 new_dev->name[MDIO_NAME_LEN - 1] = 0;
129 new_dev->priv = ldev;
131 debug("miiphy_register: added '%s', read=0x%08lx, write=0x%08lx\n",
132 new_dev->name, ldev->read, ldev->write);
134 /* add it to the list */
135 list_add_tail(&new_dev->link, &mii_devs);
138 current_mii = new_dev;
141 struct mii_dev *mdio_alloc(void)
145 bus = malloc(sizeof(*bus));
149 memset(bus, 0, sizeof(*bus));
151 /* initalize mii_dev struct fields */
152 INIT_LIST_HEAD(&bus->link);
157 void mdio_free(struct mii_dev *bus)
162 int mdio_register(struct mii_dev *bus)
164 if (!bus || !bus->read || !bus->write)
167 /* check if we have unique name */
168 if (miiphy_get_dev_by_name(bus->name)) {
169 printf("mdio_register: non unique device name '%s'\n",
174 /* add it to the list */
175 list_add_tail(&bus->link, &mii_devs);
183 int mdio_unregister(struct mii_dev *bus)
188 /* delete it from the list */
189 list_del(&bus->link);
191 if (current_mii == bus)
197 void mdio_list_devices(void)
199 struct list_head *entry;
201 list_for_each(entry, &mii_devs) {
203 struct mii_dev *bus = list_entry(entry, struct mii_dev, link);
205 printf("%s:\n", bus->name);
207 for (i = 0; i < PHY_MAX_ADDR; i++) {
208 struct phy_device *phydev = bus->phymap[i];
211 printf("%d - %s", i, phydev->drv->name);
214 printf(" <--> %s\n", phydev->dev->name);
222 int miiphy_set_current_dev(const char *devname)
226 dev = miiphy_get_dev_by_name(devname);
232 printf("No such device: %s\n", devname);
237 struct mii_dev *mdio_get_current_dev(void)
242 struct phy_device *mdio_phydev_for_ethname(const char *ethname)
244 struct list_head *entry;
247 list_for_each(entry, &mii_devs) {
249 bus = list_entry(entry, struct mii_dev, link);
251 for (i = 0; i < PHY_MAX_ADDR; i++) {
252 if (!bus->phymap[i] || !bus->phymap[i]->dev)
255 if (strcmp(bus->phymap[i]->dev->name, ethname) == 0)
256 return bus->phymap[i];
260 printf("%s is not a known ethernet\n", ethname);
264 const char *miiphy_get_current_dev(void)
267 return current_mii->name;
272 static struct mii_dev *miiphy_get_active_dev(const char *devname)
274 /* If the current mii is the one we want, return it */
276 if (strcmp(current_mii->name, devname) == 0)
279 /* Otherwise, set the active one to the one we want */
280 if (miiphy_set_current_dev(devname))
286 /*****************************************************************************
288 * Read to variable <value> from the PHY attached to device <devname>,
289 * use PHY address <addr> and register <reg>.
291 * This API is deprecated. Use phy_read on a phy_device found via phy_connect
296 int miiphy_read(const char *devname, unsigned char addr, unsigned char reg,
297 unsigned short *value)
302 bus = miiphy_get_active_dev(devname);
306 ret = bus->read(bus, addr, MDIO_DEVAD_NONE, reg);
310 *value = (unsigned short)ret;
314 /*****************************************************************************
316 * Write <value> to the PHY attached to device <devname>,
317 * use PHY address <addr> and register <reg>.
319 * This API is deprecated. Use phy_write on a phy_device found by phy_connect
324 int miiphy_write(const char *devname, unsigned char addr, unsigned char reg,
325 unsigned short value)
329 bus = miiphy_get_active_dev(devname);
331 return bus->write(bus, addr, MDIO_DEVAD_NONE, reg, value);
336 /*****************************************************************************
338 * Print out list of registered MII capable devices.
340 void miiphy_listdev(void)
342 struct list_head *entry;
345 puts("MII devices: ");
346 list_for_each(entry, &mii_devs) {
347 dev = list_entry(entry, struct mii_dev, link);
348 printf("'%s' ", dev->name);
353 printf("Current device: '%s'\n", current_mii->name);
356 /*****************************************************************************
358 * Read the OUI, manufacture's model number, and revision number.
360 * OUI: 22 bits (unsigned int)
361 * Model: 6 bits (unsigned char)
362 * Revision: 4 bits (unsigned char)
364 * This API is deprecated.
369 int miiphy_info(const char *devname, unsigned char addr, unsigned int *oui,
370 unsigned char *model, unsigned char *rev)
372 unsigned int reg = 0;
375 if (miiphy_read(devname, addr, MII_PHYSID2, &tmp) != 0) {
376 debug("PHY ID register 2 read failed\n");
381 debug("MII_PHYSID2 @ 0x%x = 0x%04x\n", addr, reg);
384 /* No physical device present at this address */
388 if (miiphy_read(devname, addr, MII_PHYSID1, &tmp) != 0) {
389 debug("PHY ID register 1 read failed\n");
393 debug("PHY_PHYIDR[1,2] @ 0x%x = 0x%08x\n", addr, reg);
396 *model = (unsigned char)((reg >> 4) & 0x0000003F);
397 *rev = (unsigned char)(reg & 0x0000000F);
401 #ifndef CONFIG_PHYLIB
402 /*****************************************************************************
406 * This API is deprecated. Use PHYLIB.
411 int miiphy_reset(const char *devname, unsigned char addr)
416 if (miiphy_read(devname, addr, MII_BMCR, ®) != 0) {
417 debug("PHY status read failed\n");
420 if (miiphy_write(devname, addr, MII_BMCR, reg | BMCR_RESET) != 0) {
421 debug("PHY reset failed\n");
424 #ifdef CONFIG_PHY_RESET_DELAY
425 udelay(CONFIG_PHY_RESET_DELAY); /* Intel LXT971A needs this */
428 * Poll the control register for the reset bit to go to 0 (it is
429 * auto-clearing). This should happen within 0.5 seconds per the
433 while (((reg & 0x8000) != 0) && timeout--) {
434 if (miiphy_read(devname, addr, MII_BMCR, ®) != 0) {
435 debug("PHY status read failed\n");
440 if ((reg & 0x8000) == 0) {
443 puts("PHY reset timed out\n");
450 /*****************************************************************************
452 * Determine the ethernet speed (10/100/1000). Return 10 on error.
454 int miiphy_speed(const char *devname, unsigned char addr)
458 #if defined(CONFIG_PHY_GIGE)
462 * Check for 1000BASE-X. If it is supported, then assume that the speed
465 if (miiphy_is_1000base_x(devname, addr))
469 * No 1000BASE-X, so assume 1000BASE-T/100BASE-TX/10BASE-T register set.
471 /* Check for 1000BASE-T. */
472 if (miiphy_read(devname, addr, MII_STAT1000, &btsr)) {
473 printf("PHY 1000BT status");
474 goto miiphy_read_failed;
476 if (btsr != 0xFFFF &&
477 (btsr & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD)))
479 #endif /* CONFIG_PHY_GIGE */
481 /* Check Basic Management Control Register first. */
482 if (miiphy_read(devname, addr, MII_BMCR, &bmcr)) {
484 goto miiphy_read_failed;
486 /* Check if auto-negotiation is on. */
487 if (bmcr & BMCR_ANENABLE) {
488 /* Get auto-negotiation results. */
489 if (miiphy_read(devname, addr, MII_LPA, &anlpar)) {
490 printf("PHY AN speed");
491 goto miiphy_read_failed;
493 return (anlpar & LPA_100) ? _100BASET : _10BASET;
495 /* Get speed from basic control settings. */
496 return (bmcr & BMCR_SPEED100) ? _100BASET : _10BASET;
499 printf(" read failed, assuming 10BASE-T\n");
503 /*****************************************************************************
505 * Determine full/half duplex. Return half on error.
507 int miiphy_duplex(const char *devname, unsigned char addr)
511 #if defined(CONFIG_PHY_GIGE)
514 /* Check for 1000BASE-X. */
515 if (miiphy_is_1000base_x(devname, addr)) {
517 if (miiphy_read(devname, addr, MII_LPA, &anlpar)) {
518 printf("1000BASE-X PHY AN duplex");
519 goto miiphy_read_failed;
523 * No 1000BASE-X, so assume 1000BASE-T/100BASE-TX/10BASE-T register set.
525 /* Check for 1000BASE-T. */
526 if (miiphy_read(devname, addr, MII_STAT1000, &btsr)) {
527 printf("PHY 1000BT status");
528 goto miiphy_read_failed;
530 if (btsr != 0xFFFF) {
531 if (btsr & PHY_1000BTSR_1000FD) {
533 } else if (btsr & PHY_1000BTSR_1000HD) {
537 #endif /* CONFIG_PHY_GIGE */
539 /* Check Basic Management Control Register first. */
540 if (miiphy_read(devname, addr, MII_BMCR, &bmcr)) {
542 goto miiphy_read_failed;
544 /* Check if auto-negotiation is on. */
545 if (bmcr & BMCR_ANENABLE) {
546 /* Get auto-negotiation results. */
547 if (miiphy_read(devname, addr, MII_LPA, &anlpar)) {
548 puts("PHY AN duplex");
549 goto miiphy_read_failed;
551 return (anlpar & (LPA_10FULL | LPA_100FULL)) ?
554 /* Get speed from basic control settings. */
555 return (bmcr & BMCR_FULLDPLX) ? FULL : HALF;
558 printf(" read failed, assuming half duplex\n");
562 /*****************************************************************************
564 * Return 1 if PHY supports 1000BASE-X, 0 if PHY supports 10BASE-T/100BASE-TX/
565 * 1000BASE-T, or on error.
567 int miiphy_is_1000base_x(const char *devname, unsigned char addr)
569 #if defined(CONFIG_PHY_GIGE)
572 if (miiphy_read(devname, addr, MII_ESTATUS, &exsr)) {
573 printf("PHY extended status read failed, assuming no "
577 return 0 != (exsr & (ESTATUS_1000XF | ESTATUS_1000XH));
583 #ifdef CONFIG_SYS_FAULT_ECHO_LINK_DOWN
584 /*****************************************************************************
586 * Determine link status
588 int miiphy_link(const char *devname, unsigned char addr)
592 /* dummy read; needed to latch some phys */
593 (void)miiphy_read(devname, addr, MII_BMSR, ®);
594 if (miiphy_read(devname, addr, MII_BMSR, ®)) {
595 puts("MII_BMSR read failed, assuming no link\n");
599 /* Determine if a link is active */
600 if ((reg & BMSR_LSTATUS) != 0) {