2 * Core PHY library, taken from phy.c
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
9 #include <linux/export.h>
10 #include <linux/phy.h>
12 const char *phy_speed_to_str(int speed)
44 return "Unsupported (update phy-core.c)";
47 EXPORT_SYMBOL_GPL(phy_speed_to_str);
49 const char *phy_duplex_to_str(unsigned int duplex)
51 if (duplex == DUPLEX_HALF)
53 if (duplex == DUPLEX_FULL)
55 if (duplex == DUPLEX_UNKNOWN)
57 return "Unsupported (update phy-core.c)";
59 EXPORT_SYMBOL_GPL(phy_duplex_to_str);
61 /* A mapping of all SUPPORTED settings to speed/duplex. This table
62 * must be grouped by speed and sorted in descending match priority
63 * - iow, descending speed. */
64 static const struct phy_setting settings[] = {
67 .speed = SPEED_100000,
68 .duplex = DUPLEX_FULL,
69 .bit = ETHTOOL_LINK_MODE_100000baseCR4_Full_BIT,
72 .speed = SPEED_100000,
73 .duplex = DUPLEX_FULL,
74 .bit = ETHTOOL_LINK_MODE_100000baseKR4_Full_BIT,
77 .speed = SPEED_100000,
78 .duplex = DUPLEX_FULL,
79 .bit = ETHTOOL_LINK_MODE_100000baseLR4_ER4_Full_BIT,
82 .speed = SPEED_100000,
83 .duplex = DUPLEX_FULL,
84 .bit = ETHTOOL_LINK_MODE_100000baseSR4_Full_BIT,
89 .duplex = DUPLEX_FULL,
90 .bit = ETHTOOL_LINK_MODE_56000baseCR4_Full_BIT,
94 .duplex = DUPLEX_FULL,
95 .bit = ETHTOOL_LINK_MODE_56000baseKR4_Full_BIT,
99 .duplex = DUPLEX_FULL,
100 .bit = ETHTOOL_LINK_MODE_56000baseLR4_Full_BIT,
103 .speed = SPEED_56000,
104 .duplex = DUPLEX_FULL,
105 .bit = ETHTOOL_LINK_MODE_56000baseSR4_Full_BIT,
109 .speed = SPEED_50000,
110 .duplex = DUPLEX_FULL,
111 .bit = ETHTOOL_LINK_MODE_50000baseCR2_Full_BIT,
114 .speed = SPEED_50000,
115 .duplex = DUPLEX_FULL,
116 .bit = ETHTOOL_LINK_MODE_50000baseKR2_Full_BIT,
119 .speed = SPEED_50000,
120 .duplex = DUPLEX_FULL,
121 .bit = ETHTOOL_LINK_MODE_50000baseSR2_Full_BIT,
125 .speed = SPEED_40000,
126 .duplex = DUPLEX_FULL,
127 .bit = ETHTOOL_LINK_MODE_40000baseCR4_Full_BIT,
130 .speed = SPEED_40000,
131 .duplex = DUPLEX_FULL,
132 .bit = ETHTOOL_LINK_MODE_40000baseKR4_Full_BIT,
135 .speed = SPEED_40000,
136 .duplex = DUPLEX_FULL,
137 .bit = ETHTOOL_LINK_MODE_40000baseLR4_Full_BIT,
140 .speed = SPEED_40000,
141 .duplex = DUPLEX_FULL,
142 .bit = ETHTOOL_LINK_MODE_40000baseSR4_Full_BIT,
146 .speed = SPEED_25000,
147 .duplex = DUPLEX_FULL,
148 .bit = ETHTOOL_LINK_MODE_25000baseCR_Full_BIT,
151 .speed = SPEED_25000,
152 .duplex = DUPLEX_FULL,
153 .bit = ETHTOOL_LINK_MODE_25000baseKR_Full_BIT,
156 .speed = SPEED_25000,
157 .duplex = DUPLEX_FULL,
158 .bit = ETHTOOL_LINK_MODE_25000baseSR_Full_BIT,
163 .speed = SPEED_20000,
164 .duplex = DUPLEX_FULL,
165 .bit = ETHTOOL_LINK_MODE_20000baseKR2_Full_BIT,
168 .speed = SPEED_20000,
169 .duplex = DUPLEX_FULL,
170 .bit = ETHTOOL_LINK_MODE_20000baseMLD2_Full_BIT,
174 .speed = SPEED_10000,
175 .duplex = DUPLEX_FULL,
176 .bit = ETHTOOL_LINK_MODE_10000baseCR_Full_BIT,
179 .speed = SPEED_10000,
180 .duplex = DUPLEX_FULL,
181 .bit = ETHTOOL_LINK_MODE_10000baseER_Full_BIT,
184 .speed = SPEED_10000,
185 .duplex = DUPLEX_FULL,
186 .bit = ETHTOOL_LINK_MODE_10000baseKR_Full_BIT,
189 .speed = SPEED_10000,
190 .duplex = DUPLEX_FULL,
191 .bit = ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT,
194 .speed = SPEED_10000,
195 .duplex = DUPLEX_FULL,
196 .bit = ETHTOOL_LINK_MODE_10000baseLR_Full_BIT,
199 .speed = SPEED_10000,
200 .duplex = DUPLEX_FULL,
201 .bit = ETHTOOL_LINK_MODE_10000baseLRM_Full_BIT,
204 .speed = SPEED_10000,
205 .duplex = DUPLEX_FULL,
206 .bit = ETHTOOL_LINK_MODE_10000baseR_FEC_BIT,
209 .speed = SPEED_10000,
210 .duplex = DUPLEX_FULL,
211 .bit = ETHTOOL_LINK_MODE_10000baseSR_Full_BIT,
214 .speed = SPEED_10000,
215 .duplex = DUPLEX_FULL,
216 .bit = ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
221 .duplex = DUPLEX_FULL,
222 .bit = ETHTOOL_LINK_MODE_5000baseT_Full_BIT,
228 .duplex = DUPLEX_FULL,
229 .bit = ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
233 .duplex = DUPLEX_FULL,
234 .bit = ETHTOOL_LINK_MODE_2500baseX_Full_BIT,
239 .duplex = DUPLEX_FULL,
240 .bit = ETHTOOL_LINK_MODE_1000baseKX_Full_BIT,
244 .duplex = DUPLEX_FULL,
245 .bit = ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
249 .duplex = DUPLEX_HALF,
250 .bit = ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
254 .duplex = DUPLEX_FULL,
255 .bit = ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
260 .duplex = DUPLEX_FULL,
261 .bit = ETHTOOL_LINK_MODE_100baseT_Full_BIT,
265 .duplex = DUPLEX_HALF,
266 .bit = ETHTOOL_LINK_MODE_100baseT_Half_BIT,
271 .duplex = DUPLEX_FULL,
272 .bit = ETHTOOL_LINK_MODE_10baseT_Full_BIT,
276 .duplex = DUPLEX_HALF,
277 .bit = ETHTOOL_LINK_MODE_10baseT_Half_BIT,
282 * phy_lookup_setting - lookup a PHY setting
283 * @speed: speed to match
284 * @duplex: duplex to match
285 * @mask: allowed link modes
286 * @exact: an exact match is required
288 * Search the settings array for a setting that matches the speed and
289 * duplex, and which is supported.
291 * If @exact is unset, either an exact match or %NULL for no match will
294 * If @exact is set, an exact match, the fastest supported setting at
295 * or below the specified speed, the slowest supported setting, or if
296 * they all fail, %NULL will be returned.
298 const struct phy_setting *
299 phy_lookup_setting(int speed, int duplex, const unsigned long *mask, bool exact)
301 const struct phy_setting *p, *match = NULL, *last = NULL;
304 for (i = 0, p = settings; i < ARRAY_SIZE(settings); i++, p++) {
305 if (p->bit < __ETHTOOL_LINK_MODE_MASK_NBITS &&
306 test_bit(p->bit, mask)) {
308 if (p->speed == speed && p->duplex == duplex) {
309 /* Exact match for speed and duplex */
313 if (!match && p->speed <= speed)
317 if (p->speed < speed)
323 if (!match && !exact)
328 EXPORT_SYMBOL_GPL(phy_lookup_setting);
330 size_t phy_speeds(unsigned int *speeds, size_t size,
336 for (i = 0, count = 0; i < ARRAY_SIZE(settings) && count < size; i++)
337 if (settings[i].bit < __ETHTOOL_LINK_MODE_MASK_NBITS &&
338 test_bit(settings[i].bit, mask) &&
339 (count == 0 || speeds[count - 1] != settings[i].speed))
340 speeds[count++] = settings[i].speed;
346 * phy_resolve_aneg_linkmode - resolve the advertisements into phy settings
347 * @phydev: The phy_device struct
349 * Resolve our and the link partner advertisements into their corresponding
350 * speed and duplex. If full duplex was negotiated, extract the pause mode
351 * from the link partner mask.
353 void phy_resolve_aneg_linkmode(struct phy_device *phydev)
355 __ETHTOOL_DECLARE_LINK_MODE_MASK(common);
357 linkmode_and(common, phydev->lp_advertising, phydev->advertising);
359 if (linkmode_test_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT, common)) {
360 phydev->speed = SPEED_10000;
361 phydev->duplex = DUPLEX_FULL;
362 } else if (linkmode_test_bit(ETHTOOL_LINK_MODE_5000baseT_Full_BIT,
364 phydev->speed = SPEED_5000;
365 phydev->duplex = DUPLEX_FULL;
366 } else if (linkmode_test_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
368 phydev->speed = SPEED_2500;
369 phydev->duplex = DUPLEX_FULL;
370 } else if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
372 phydev->speed = SPEED_1000;
373 phydev->duplex = DUPLEX_FULL;
374 } else if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
376 phydev->speed = SPEED_1000;
377 phydev->duplex = DUPLEX_HALF;
378 } else if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
380 phydev->speed = SPEED_100;
381 phydev->duplex = DUPLEX_FULL;
382 } else if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
384 phydev->speed = SPEED_100;
385 phydev->duplex = DUPLEX_HALF;
386 } else if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
388 phydev->speed = SPEED_10;
389 phydev->duplex = DUPLEX_FULL;
390 } else if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
392 phydev->speed = SPEED_10;
393 phydev->duplex = DUPLEX_HALF;
396 if (phydev->duplex == DUPLEX_FULL) {
397 phydev->pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
398 phydev->lp_advertising);
399 phydev->asym_pause = linkmode_test_bit(
400 ETHTOOL_LINK_MODE_Asym_Pause_BIT,
401 phydev->lp_advertising);
404 EXPORT_SYMBOL_GPL(phy_resolve_aneg_linkmode);
406 static void mmd_phy_indirect(struct mii_bus *bus, int phy_addr, int devad,
409 /* Write the desired MMD Devad */
410 __mdiobus_write(bus, phy_addr, MII_MMD_CTRL, devad);
412 /* Write the desired MMD register address */
413 __mdiobus_write(bus, phy_addr, MII_MMD_DATA, regnum);
415 /* Select the Function : DATA with no post increment */
416 __mdiobus_write(bus, phy_addr, MII_MMD_CTRL,
417 devad | MII_MMD_CTRL_NOINCR);
421 * phy_read_mmd - Convenience function for reading a register
422 * from an MMD on a given PHY.
423 * @phydev: The phy_device struct
424 * @devad: The MMD to read from (0..31)
425 * @regnum: The register on the MMD to read (0..65535)
427 * Same rules as for phy_read();
429 int phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum)
433 if (regnum > (u16)~0 || devad > 32)
436 if (phydev->drv->read_mmd) {
437 val = phydev->drv->read_mmd(phydev, devad, regnum);
438 } else if (phydev->is_c45) {
439 u32 addr = MII_ADDR_C45 | (devad << 16) | (regnum & 0xffff);
441 val = mdiobus_read(phydev->mdio.bus, phydev->mdio.addr, addr);
443 struct mii_bus *bus = phydev->mdio.bus;
444 int phy_addr = phydev->mdio.addr;
446 mutex_lock(&bus->mdio_lock);
447 mmd_phy_indirect(bus, phy_addr, devad, regnum);
449 /* Read the content of the MMD's selected register */
450 val = __mdiobus_read(bus, phy_addr, MII_MMD_DATA);
451 mutex_unlock(&bus->mdio_lock);
455 EXPORT_SYMBOL(phy_read_mmd);
458 * phy_write_mmd - Convenience function for writing a register
459 * on an MMD on a given PHY.
460 * @phydev: The phy_device struct
461 * @devad: The MMD to read from
462 * @regnum: The register on the MMD to read
463 * @val: value to write to @regnum
465 * Same rules as for phy_write();
467 int phy_write_mmd(struct phy_device *phydev, int devad, u32 regnum, u16 val)
471 if (regnum > (u16)~0 || devad > 32)
474 if (phydev->drv->write_mmd) {
475 ret = phydev->drv->write_mmd(phydev, devad, regnum, val);
476 } else if (phydev->is_c45) {
477 u32 addr = MII_ADDR_C45 | (devad << 16) | (regnum & 0xffff);
479 ret = mdiobus_write(phydev->mdio.bus, phydev->mdio.addr,
482 struct mii_bus *bus = phydev->mdio.bus;
483 int phy_addr = phydev->mdio.addr;
485 mutex_lock(&bus->mdio_lock);
486 mmd_phy_indirect(bus, phy_addr, devad, regnum);
488 /* Write the data into MMD's selected register */
489 __mdiobus_write(bus, phy_addr, MII_MMD_DATA, val);
490 mutex_unlock(&bus->mdio_lock);
496 EXPORT_SYMBOL(phy_write_mmd);
499 * __phy_modify() - Convenience function for modifying a PHY register
500 * @phydev: a pointer to a &struct phy_device
501 * @regnum: register number
502 * @mask: bit mask of bits to clear
503 * @set: bit mask of bits to set
505 * Unlocked helper function which allows a PHY register to be modified as
506 * new register value = (old register value & ~mask) | set
508 int __phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
512 ret = __phy_read(phydev, regnum);
516 ret = __phy_write(phydev, regnum, (ret & ~mask) | set);
518 return ret < 0 ? ret : 0;
520 EXPORT_SYMBOL_GPL(__phy_modify);
523 * phy_modify - Convenience function for modifying a given PHY register
524 * @phydev: the phy_device struct
525 * @regnum: register number to write
526 * @mask: bit mask of bits to clear
527 * @set: new value of bits set in mask to write to @regnum
529 * NOTE: MUST NOT be called from interrupt context,
530 * because the bus read/write functions may wait for an interrupt
531 * to conclude the operation.
533 int phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
537 mutex_lock(&phydev->mdio.bus->mdio_lock);
538 ret = __phy_modify(phydev, regnum, mask, set);
539 mutex_unlock(&phydev->mdio.bus->mdio_lock);
543 EXPORT_SYMBOL_GPL(phy_modify);
545 static int __phy_read_page(struct phy_device *phydev)
547 return phydev->drv->read_page(phydev);
550 static int __phy_write_page(struct phy_device *phydev, int page)
552 return phydev->drv->write_page(phydev, page);
556 * phy_save_page() - take the bus lock and save the current page
557 * @phydev: a pointer to a &struct phy_device
559 * Take the MDIO bus lock, and return the current page number. On error,
560 * returns a negative errno. phy_restore_page() must always be called
561 * after this, irrespective of success or failure of this call.
563 int phy_save_page(struct phy_device *phydev)
565 mutex_lock(&phydev->mdio.bus->mdio_lock);
566 return __phy_read_page(phydev);
568 EXPORT_SYMBOL_GPL(phy_save_page);
571 * phy_select_page() - take the bus lock, save the current page, and set a page
572 * @phydev: a pointer to a &struct phy_device
573 * @page: desired page
575 * Take the MDIO bus lock to protect against concurrent access, save the
576 * current PHY page, and set the current page. On error, returns a
577 * negative errno, otherwise returns the previous page number.
578 * phy_restore_page() must always be called after this, irrespective
579 * of success or failure of this call.
581 int phy_select_page(struct phy_device *phydev, int page)
585 oldpage = ret = phy_save_page(phydev);
589 if (oldpage != page) {
590 ret = __phy_write_page(phydev, page);
597 EXPORT_SYMBOL_GPL(phy_select_page);
600 * phy_restore_page() - restore the page register and release the bus lock
601 * @phydev: a pointer to a &struct phy_device
602 * @oldpage: the old page, return value from phy_save_page() or phy_select_page()
603 * @ret: operation's return code
605 * Release the MDIO bus lock, restoring @oldpage if it is a valid page.
606 * This function propagates the earliest error code from the group of
610 * @oldpage if it was a negative value, otherwise
611 * @ret if it was a negative errno value, otherwise
612 * phy_write_page()'s negative value if it were in error, otherwise
615 int phy_restore_page(struct phy_device *phydev, int oldpage, int ret)
620 r = __phy_write_page(phydev, oldpage);
622 /* Propagate the operation return code if the page write
625 if (ret >= 0 && r < 0)
628 /* Propagate the phy page selection error code */
632 mutex_unlock(&phydev->mdio.bus->mdio_lock);
636 EXPORT_SYMBOL_GPL(phy_restore_page);
639 * phy_read_paged() - Convenience function for reading a paged register
640 * @phydev: a pointer to a &struct phy_device
641 * @page: the page for the phy
642 * @regnum: register number
644 * Same rules as for phy_read().
646 int phy_read_paged(struct phy_device *phydev, int page, u32 regnum)
648 int ret = 0, oldpage;
650 oldpage = phy_select_page(phydev, page);
652 ret = __phy_read(phydev, regnum);
654 return phy_restore_page(phydev, oldpage, ret);
656 EXPORT_SYMBOL(phy_read_paged);
659 * phy_write_paged() - Convenience function for writing a paged register
660 * @phydev: a pointer to a &struct phy_device
661 * @page: the page for the phy
662 * @regnum: register number
663 * @val: value to write
665 * Same rules as for phy_write().
667 int phy_write_paged(struct phy_device *phydev, int page, u32 regnum, u16 val)
669 int ret = 0, oldpage;
671 oldpage = phy_select_page(phydev, page);
673 ret = __phy_write(phydev, regnum, val);
675 return phy_restore_page(phydev, oldpage, ret);
677 EXPORT_SYMBOL(phy_write_paged);
680 * phy_modify_paged() - Convenience function for modifying a paged register
681 * @phydev: a pointer to a &struct phy_device
682 * @page: the page for the phy
683 * @regnum: register number
684 * @mask: bit mask of bits to clear
685 * @set: bit mask of bits to set
687 * Same rules as for phy_read() and phy_write().
689 int phy_modify_paged(struct phy_device *phydev, int page, u32 regnum,
692 int ret = 0, oldpage;
694 oldpage = phy_select_page(phydev, page);
696 ret = __phy_modify(phydev, regnum, mask, set);
698 return phy_restore_page(phydev, oldpage, ret);
700 EXPORT_SYMBOL(phy_modify_paged);