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
17 #include <asm/types.h>
18 #include <linux/list.h>
22 /* local debug macro */
27 #define debug(fmt, args...) printf(fmt, ##args)
29 #define debug(fmt, args...)
30 #endif /* MII_DEBUG */
32 static struct list_head mii_devs;
33 static struct mii_dev *current_mii;
36 * Lookup the mii_dev struct by the registered device name.
38 struct mii_dev *miiphy_get_dev_by_name(const char *devname)
40 struct list_head *entry;
44 printf("NULL device name!\n");
48 list_for_each(entry, &mii_devs) {
49 dev = list_entry(entry, struct mii_dev, link);
50 if (strcmp(dev->name, devname) == 0)
57 /*****************************************************************************
59 * Initialize global data. Need to be called before any other miiphy routine.
61 void miiphy_init(void)
63 INIT_LIST_HEAD(&mii_devs);
67 static int legacy_miiphy_read(struct mii_dev *bus, int addr, int devad, int reg)
71 struct legacy_mii_dev *ldev = bus->priv;
73 ret = ldev->read(bus->name, addr, reg, &val);
75 return ret ? -1 : (int)val;
78 static int legacy_miiphy_write(struct mii_dev *bus, int addr, int devad,
81 struct legacy_mii_dev *ldev = bus->priv;
83 return ldev->write(bus->name, addr, reg, val);
86 /*****************************************************************************
88 * Register read and write MII access routines for the device <name>.
89 * This API is now deprecated. Please use mdio_alloc and mdio_register, instead.
91 void miiphy_register(const char *name,
92 int (*read)(const char *devname, unsigned char addr,
93 unsigned char reg, unsigned short *value),
94 int (*write)(const char *devname, unsigned char addr,
95 unsigned char reg, unsigned short value))
97 struct mii_dev *new_dev;
98 struct legacy_mii_dev *ldev;
100 BUG_ON(strlen(name) >= MDIO_NAME_LEN);
102 /* check if we have unique name */
103 new_dev = miiphy_get_dev_by_name(name);
105 printf("miiphy_register: non unique device name '%s'\n", name);
109 /* allocate memory */
110 new_dev = mdio_alloc();
111 ldev = malloc(sizeof(*ldev));
113 if (new_dev == NULL || ldev == NULL) {
114 printf("miiphy_register: cannot allocate memory for '%s'\n",
119 /* initalize mii_dev struct fields */
120 new_dev->read = legacy_miiphy_read;
121 new_dev->write = legacy_miiphy_write;
122 strncpy(new_dev->name, name, MDIO_NAME_LEN);
123 new_dev->name[MDIO_NAME_LEN - 1] = 0;
126 new_dev->priv = ldev;
128 debug("miiphy_register: added '%s', read=0x%08lx, write=0x%08lx\n",
129 new_dev->name, ldev->read, ldev->write);
131 /* add it to the list */
132 list_add_tail(&new_dev->link, &mii_devs);
135 current_mii = new_dev;
138 struct mii_dev *mdio_alloc(void)
142 bus = malloc(sizeof(*bus));
146 memset(bus, 0, sizeof(*bus));
148 /* initalize mii_dev struct fields */
149 INIT_LIST_HEAD(&bus->link);
154 int mdio_register(struct mii_dev *bus)
156 if (!bus || !bus->name || !bus->read || !bus->write)
159 /* check if we have unique name */
160 if (miiphy_get_dev_by_name(bus->name)) {
161 printf("mdio_register: non unique device name '%s'\n",
166 /* add it to the list */
167 list_add_tail(&bus->link, &mii_devs);
175 void mdio_list_devices(void)
177 struct list_head *entry;
179 list_for_each(entry, &mii_devs) {
181 struct mii_dev *bus = list_entry(entry, struct mii_dev, link);
183 printf("%s:\n", bus->name);
185 for (i = 0; i < PHY_MAX_ADDR; i++) {
186 struct phy_device *phydev = bus->phymap[i];
189 printf("%d - %s", i, phydev->drv->name);
192 printf(" <--> %s\n", phydev->dev->name);
200 int miiphy_set_current_dev(const char *devname)
204 dev = miiphy_get_dev_by_name(devname);
210 printf("No such device: %s\n", devname);
215 struct mii_dev *mdio_get_current_dev(void)
220 struct phy_device *mdio_phydev_for_ethname(const char *ethname)
222 struct list_head *entry;
225 list_for_each(entry, &mii_devs) {
227 bus = list_entry(entry, struct mii_dev, link);
229 for (i = 0; i < PHY_MAX_ADDR; i++) {
230 if (!bus->phymap[i] || !bus->phymap[i]->dev)
233 if (strcmp(bus->phymap[i]->dev->name, ethname) == 0)
234 return bus->phymap[i];
238 printf("%s is not a known ethernet\n", ethname);
242 const char *miiphy_get_current_dev(void)
245 return current_mii->name;
250 static struct mii_dev *miiphy_get_active_dev(const char *devname)
252 /* If the current mii is the one we want, return it */
254 if (strcmp(current_mii->name, devname) == 0)
257 /* Otherwise, set the active one to the one we want */
258 if (miiphy_set_current_dev(devname))
264 /*****************************************************************************
266 * Read to variable <value> from the PHY attached to device <devname>,
267 * use PHY address <addr> and register <reg>.
269 * This API is deprecated. Use phy_read on a phy_device found via phy_connect
274 int miiphy_read(const char *devname, unsigned char addr, unsigned char reg,
275 unsigned short *value)
280 bus = miiphy_get_active_dev(devname);
284 ret = bus->read(bus, addr, MDIO_DEVAD_NONE, reg);
288 *value = (unsigned short)ret;
292 /*****************************************************************************
294 * Write <value> to the PHY attached to device <devname>,
295 * use PHY address <addr> and register <reg>.
297 * This API is deprecated. Use phy_write on a phy_device found by phy_connect
302 int miiphy_write(const char *devname, unsigned char addr, unsigned char reg,
303 unsigned short value)
307 bus = miiphy_get_active_dev(devname);
309 return bus->write(bus, addr, MDIO_DEVAD_NONE, reg, value);
314 /*****************************************************************************
316 * Print out list of registered MII capable devices.
318 void miiphy_listdev(void)
320 struct list_head *entry;
323 puts("MII devices: ");
324 list_for_each(entry, &mii_devs) {
325 dev = list_entry(entry, struct mii_dev, link);
326 printf("'%s' ", dev->name);
331 printf("Current device: '%s'\n", current_mii->name);
334 /*****************************************************************************
336 * Read the OUI, manufacture's model number, and revision number.
338 * OUI: 22 bits (unsigned int)
339 * Model: 6 bits (unsigned char)
340 * Revision: 4 bits (unsigned char)
342 * This API is deprecated.
347 int miiphy_info(const char *devname, unsigned char addr, unsigned int *oui,
348 unsigned char *model, unsigned char *rev)
350 unsigned int reg = 0;
353 if (miiphy_read(devname, addr, MII_PHYSID2, &tmp) != 0) {
354 debug("PHY ID register 2 read failed\n");
359 debug("MII_PHYSID2 @ 0x%x = 0x%04x\n", addr, reg);
362 /* No physical device present at this address */
366 if (miiphy_read(devname, addr, MII_PHYSID1, &tmp) != 0) {
367 debug("PHY ID register 1 read failed\n");
371 debug("PHY_PHYIDR[1,2] @ 0x%x = 0x%08x\n", addr, reg);
374 *model = (unsigned char)((reg >> 4) & 0x0000003F);
375 *rev = (unsigned char)(reg & 0x0000000F);
379 #ifndef CONFIG_PHYLIB
380 /*****************************************************************************
384 * This API is deprecated. Use PHYLIB.
389 int miiphy_reset(const char *devname, unsigned char addr)
394 if (miiphy_read(devname, addr, MII_BMCR, ®) != 0) {
395 debug("PHY status read failed\n");
398 if (miiphy_write(devname, addr, MII_BMCR, reg | BMCR_RESET) != 0) {
399 debug("PHY reset failed\n");
402 #ifdef CONFIG_PHY_RESET_DELAY
403 udelay(CONFIG_PHY_RESET_DELAY); /* Intel LXT971A needs this */
406 * Poll the control register for the reset bit to go to 0 (it is
407 * auto-clearing). This should happen within 0.5 seconds per the
411 while (((reg & 0x8000) != 0) && timeout--) {
412 if (miiphy_read(devname, addr, MII_BMCR, ®) != 0) {
413 debug("PHY status read failed\n");
418 if ((reg & 0x8000) == 0) {
421 puts("PHY reset timed out\n");
428 /*****************************************************************************
430 * Determine the ethernet speed (10/100/1000). Return 10 on error.
432 int miiphy_speed(const char *devname, unsigned char addr)
436 #if defined(CONFIG_PHY_GIGE)
440 * Check for 1000BASE-X. If it is supported, then assume that the speed
443 if (miiphy_is_1000base_x(devname, addr))
447 * No 1000BASE-X, so assume 1000BASE-T/100BASE-TX/10BASE-T register set.
449 /* Check for 1000BASE-T. */
450 if (miiphy_read(devname, addr, MII_STAT1000, &btsr)) {
451 printf("PHY 1000BT status");
452 goto miiphy_read_failed;
454 if (btsr != 0xFFFF &&
455 (btsr & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD)))
457 #endif /* CONFIG_PHY_GIGE */
459 /* Check Basic Management Control Register first. */
460 if (miiphy_read(devname, addr, MII_BMCR, &bmcr)) {
462 goto miiphy_read_failed;
464 /* Check if auto-negotiation is on. */
465 if (bmcr & BMCR_ANENABLE) {
466 /* Get auto-negotiation results. */
467 if (miiphy_read(devname, addr, MII_LPA, &anlpar)) {
468 printf("PHY AN speed");
469 goto miiphy_read_failed;
471 return (anlpar & LPA_100) ? _100BASET : _10BASET;
473 /* Get speed from basic control settings. */
474 return (bmcr & BMCR_SPEED100) ? _100BASET : _10BASET;
477 printf(" read failed, assuming 10BASE-T\n");
481 /*****************************************************************************
483 * Determine full/half duplex. Return half on error.
485 int miiphy_duplex(const char *devname, unsigned char addr)
489 #if defined(CONFIG_PHY_GIGE)
492 /* Check for 1000BASE-X. */
493 if (miiphy_is_1000base_x(devname, addr)) {
495 if (miiphy_read(devname, addr, MII_LPA, &anlpar)) {
496 printf("1000BASE-X PHY AN duplex");
497 goto miiphy_read_failed;
501 * No 1000BASE-X, so assume 1000BASE-T/100BASE-TX/10BASE-T register set.
503 /* Check for 1000BASE-T. */
504 if (miiphy_read(devname, addr, MII_STAT1000, &btsr)) {
505 printf("PHY 1000BT status");
506 goto miiphy_read_failed;
508 if (btsr != 0xFFFF) {
509 if (btsr & PHY_1000BTSR_1000FD) {
511 } else if (btsr & PHY_1000BTSR_1000HD) {
515 #endif /* CONFIG_PHY_GIGE */
517 /* Check Basic Management Control Register first. */
518 if (miiphy_read(devname, addr, MII_BMCR, &bmcr)) {
520 goto miiphy_read_failed;
522 /* Check if auto-negotiation is on. */
523 if (bmcr & BMCR_ANENABLE) {
524 /* Get auto-negotiation results. */
525 if (miiphy_read(devname, addr, MII_LPA, &anlpar)) {
526 puts("PHY AN duplex");
527 goto miiphy_read_failed;
529 return (anlpar & (LPA_10FULL | LPA_100FULL)) ?
532 /* Get speed from basic control settings. */
533 return (bmcr & BMCR_FULLDPLX) ? FULL : HALF;
536 printf(" read failed, assuming half duplex\n");
540 /*****************************************************************************
542 * Return 1 if PHY supports 1000BASE-X, 0 if PHY supports 10BASE-T/100BASE-TX/
543 * 1000BASE-T, or on error.
545 int miiphy_is_1000base_x(const char *devname, unsigned char addr)
547 #if defined(CONFIG_PHY_GIGE)
550 if (miiphy_read(devname, addr, MII_ESTATUS, &exsr)) {
551 printf("PHY extended status read failed, assuming no "
555 return 0 != (exsr & (ESTATUS_1000XF | ESTATUS_1000XH));
561 #ifdef CONFIG_SYS_FAULT_ECHO_LINK_DOWN
562 /*****************************************************************************
564 * Determine link status
566 int miiphy_link(const char *devname, unsigned char addr)
570 /* dummy read; needed to latch some phys */
571 (void)miiphy_read(devname, addr, MII_BMSR, ®);
572 if (miiphy_read(devname, addr, MII_BMSR, ®)) {
573 puts("MII_BMSR read failed, assuming no link\n");
577 /* Determine if a link is active */
578 if ((reg & BMSR_LSTATUS) != 0) {