1 // SPDX-License-Identifier: GPL-2.0+
3 * Core PHY library, taken from phy.c
5 #include <linux/export.h>
9 const char *phy_speed_to_str(int speed)
11 BUILD_BUG_ON_MSG(__ETHTOOL_LINK_MODE_MASK_NBITS != 90,
12 "Enum ethtool_link_mode_bit_indices and phylib are out of sync. "
13 "If a speed or mode has been added please update phy_speed_to_str "
14 "and the PHY settings array.\n");
50 return "Unsupported (update phy-core.c)";
53 EXPORT_SYMBOL_GPL(phy_speed_to_str);
55 const char *phy_duplex_to_str(unsigned int duplex)
57 if (duplex == DUPLEX_HALF)
59 if (duplex == DUPLEX_FULL)
61 if (duplex == DUPLEX_UNKNOWN)
63 return "Unsupported (update phy-core.c)";
65 EXPORT_SYMBOL_GPL(phy_duplex_to_str);
67 /* A mapping of all SUPPORTED settings to speed/duplex. This table
68 * must be grouped by speed and sorted in descending match priority
69 * - iow, descending speed. */
71 #define PHY_SETTING(s, d, b) { .speed = SPEED_ ## s, .duplex = DUPLEX_ ## d, \
72 .bit = ETHTOOL_LINK_MODE_ ## b ## _BIT}
74 static const struct phy_setting settings[] = {
76 PHY_SETTING( 400000, FULL, 400000baseCR8_Full ),
77 PHY_SETTING( 400000, FULL, 400000baseKR8_Full ),
78 PHY_SETTING( 400000, FULL, 400000baseLR8_ER8_FR8_Full ),
79 PHY_SETTING( 400000, FULL, 400000baseDR8_Full ),
80 PHY_SETTING( 400000, FULL, 400000baseSR8_Full ),
81 PHY_SETTING( 400000, FULL, 400000baseCR4_Full ),
82 PHY_SETTING( 400000, FULL, 400000baseKR4_Full ),
83 PHY_SETTING( 400000, FULL, 400000baseLR4_ER4_FR4_Full ),
84 PHY_SETTING( 400000, FULL, 400000baseDR4_Full ),
85 PHY_SETTING( 400000, FULL, 400000baseSR4_Full ),
87 PHY_SETTING( 200000, FULL, 200000baseCR4_Full ),
88 PHY_SETTING( 200000, FULL, 200000baseKR4_Full ),
89 PHY_SETTING( 200000, FULL, 200000baseLR4_ER4_FR4_Full ),
90 PHY_SETTING( 200000, FULL, 200000baseDR4_Full ),
91 PHY_SETTING( 200000, FULL, 200000baseSR4_Full ),
92 PHY_SETTING( 200000, FULL, 200000baseCR2_Full ),
93 PHY_SETTING( 200000, FULL, 200000baseKR2_Full ),
94 PHY_SETTING( 200000, FULL, 200000baseLR2_ER2_FR2_Full ),
95 PHY_SETTING( 200000, FULL, 200000baseDR2_Full ),
96 PHY_SETTING( 200000, FULL, 200000baseSR2_Full ),
98 PHY_SETTING( 100000, FULL, 100000baseCR4_Full ),
99 PHY_SETTING( 100000, FULL, 100000baseKR4_Full ),
100 PHY_SETTING( 100000, FULL, 100000baseLR4_ER4_Full ),
101 PHY_SETTING( 100000, FULL, 100000baseSR4_Full ),
102 PHY_SETTING( 100000, FULL, 100000baseCR2_Full ),
103 PHY_SETTING( 100000, FULL, 100000baseKR2_Full ),
104 PHY_SETTING( 100000, FULL, 100000baseLR2_ER2_FR2_Full ),
105 PHY_SETTING( 100000, FULL, 100000baseDR2_Full ),
106 PHY_SETTING( 100000, FULL, 100000baseSR2_Full ),
107 PHY_SETTING( 100000, FULL, 100000baseCR_Full ),
108 PHY_SETTING( 100000, FULL, 100000baseKR_Full ),
109 PHY_SETTING( 100000, FULL, 100000baseLR_ER_FR_Full ),
110 PHY_SETTING( 100000, FULL, 100000baseDR_Full ),
111 PHY_SETTING( 100000, FULL, 100000baseSR_Full ),
113 PHY_SETTING( 56000, FULL, 56000baseCR4_Full ),
114 PHY_SETTING( 56000, FULL, 56000baseKR4_Full ),
115 PHY_SETTING( 56000, FULL, 56000baseLR4_Full ),
116 PHY_SETTING( 56000, FULL, 56000baseSR4_Full ),
118 PHY_SETTING( 50000, FULL, 50000baseCR2_Full ),
119 PHY_SETTING( 50000, FULL, 50000baseKR2_Full ),
120 PHY_SETTING( 50000, FULL, 50000baseSR2_Full ),
121 PHY_SETTING( 50000, FULL, 50000baseCR_Full ),
122 PHY_SETTING( 50000, FULL, 50000baseKR_Full ),
123 PHY_SETTING( 50000, FULL, 50000baseLR_ER_FR_Full ),
124 PHY_SETTING( 50000, FULL, 50000baseDR_Full ),
125 PHY_SETTING( 50000, FULL, 50000baseSR_Full ),
127 PHY_SETTING( 40000, FULL, 40000baseCR4_Full ),
128 PHY_SETTING( 40000, FULL, 40000baseKR4_Full ),
129 PHY_SETTING( 40000, FULL, 40000baseLR4_Full ),
130 PHY_SETTING( 40000, FULL, 40000baseSR4_Full ),
132 PHY_SETTING( 25000, FULL, 25000baseCR_Full ),
133 PHY_SETTING( 25000, FULL, 25000baseKR_Full ),
134 PHY_SETTING( 25000, FULL, 25000baseSR_Full ),
136 PHY_SETTING( 20000, FULL, 20000baseKR2_Full ),
137 PHY_SETTING( 20000, FULL, 20000baseMLD2_Full ),
139 PHY_SETTING( 10000, FULL, 10000baseCR_Full ),
140 PHY_SETTING( 10000, FULL, 10000baseER_Full ),
141 PHY_SETTING( 10000, FULL, 10000baseKR_Full ),
142 PHY_SETTING( 10000, FULL, 10000baseKX4_Full ),
143 PHY_SETTING( 10000, FULL, 10000baseLR_Full ),
144 PHY_SETTING( 10000, FULL, 10000baseLRM_Full ),
145 PHY_SETTING( 10000, FULL, 10000baseR_FEC ),
146 PHY_SETTING( 10000, FULL, 10000baseSR_Full ),
147 PHY_SETTING( 10000, FULL, 10000baseT_Full ),
149 PHY_SETTING( 5000, FULL, 5000baseT_Full ),
151 PHY_SETTING( 2500, FULL, 2500baseT_Full ),
152 PHY_SETTING( 2500, FULL, 2500baseX_Full ),
154 PHY_SETTING( 1000, FULL, 1000baseKX_Full ),
155 PHY_SETTING( 1000, FULL, 1000baseT_Full ),
156 PHY_SETTING( 1000, HALF, 1000baseT_Half ),
157 PHY_SETTING( 1000, FULL, 1000baseT1_Full ),
158 PHY_SETTING( 1000, FULL, 1000baseX_Full ),
160 PHY_SETTING( 100, FULL, 100baseT_Full ),
161 PHY_SETTING( 100, FULL, 100baseT1_Full ),
162 PHY_SETTING( 100, HALF, 100baseT_Half ),
164 PHY_SETTING( 10, FULL, 10baseT_Full ),
165 PHY_SETTING( 10, HALF, 10baseT_Half ),
170 * phy_lookup_setting - lookup a PHY setting
171 * @speed: speed to match
172 * @duplex: duplex to match
173 * @mask: allowed link modes
174 * @exact: an exact match is required
176 * Search the settings array for a setting that matches the speed and
177 * duplex, and which is supported.
179 * If @exact is unset, either an exact match or %NULL for no match will
182 * If @exact is set, an exact match, the fastest supported setting at
183 * or below the specified speed, the slowest supported setting, or if
184 * they all fail, %NULL will be returned.
186 const struct phy_setting *
187 phy_lookup_setting(int speed, int duplex, const unsigned long *mask, bool exact)
189 const struct phy_setting *p, *match = NULL, *last = NULL;
192 for (i = 0, p = settings; i < ARRAY_SIZE(settings); i++, p++) {
193 if (p->bit < __ETHTOOL_LINK_MODE_MASK_NBITS &&
194 test_bit(p->bit, mask)) {
196 if (p->speed == speed && p->duplex == duplex) {
197 /* Exact match for speed and duplex */
201 if (!match && p->speed <= speed)
205 if (p->speed < speed)
211 if (!match && !exact)
216 EXPORT_SYMBOL_GPL(phy_lookup_setting);
218 size_t phy_speeds(unsigned int *speeds, size_t size,
224 for (i = 0, count = 0; i < ARRAY_SIZE(settings) && count < size; i++)
225 if (settings[i].bit < __ETHTOOL_LINK_MODE_MASK_NBITS &&
226 test_bit(settings[i].bit, mask) &&
227 (count == 0 || speeds[count - 1] != settings[i].speed))
228 speeds[count++] = settings[i].speed;
233 static int __set_linkmode_max_speed(u32 max_speed, unsigned long *addr)
235 const struct phy_setting *p;
238 for (i = 0, p = settings; i < ARRAY_SIZE(settings); i++, p++) {
239 if (p->speed > max_speed)
240 linkmode_clear_bit(p->bit, addr);
248 static int __set_phy_supported(struct phy_device *phydev, u32 max_speed)
250 return __set_linkmode_max_speed(max_speed, phydev->supported);
253 int phy_set_max_speed(struct phy_device *phydev, u32 max_speed)
257 err = __set_phy_supported(phydev, max_speed);
261 phy_advertise_supported(phydev);
265 EXPORT_SYMBOL(phy_set_max_speed);
267 void of_set_phy_supported(struct phy_device *phydev)
269 struct device_node *node = phydev->mdio.dev.of_node;
272 if (!IS_ENABLED(CONFIG_OF_MDIO))
278 if (!of_property_read_u32(node, "max-speed", &max_speed))
279 __set_phy_supported(phydev, max_speed);
282 void of_set_phy_eee_broken(struct phy_device *phydev)
284 struct device_node *node = phydev->mdio.dev.of_node;
287 if (!IS_ENABLED(CONFIG_OF_MDIO))
293 if (of_property_read_bool(node, "eee-broken-100tx"))
294 broken |= MDIO_EEE_100TX;
295 if (of_property_read_bool(node, "eee-broken-1000t"))
296 broken |= MDIO_EEE_1000T;
297 if (of_property_read_bool(node, "eee-broken-10gt"))
298 broken |= MDIO_EEE_10GT;
299 if (of_property_read_bool(node, "eee-broken-1000kx"))
300 broken |= MDIO_EEE_1000KX;
301 if (of_property_read_bool(node, "eee-broken-10gkx4"))
302 broken |= MDIO_EEE_10GKX4;
303 if (of_property_read_bool(node, "eee-broken-10gkr"))
304 broken |= MDIO_EEE_10GKR;
306 phydev->eee_broken_modes = broken;
309 void phy_resolve_aneg_pause(struct phy_device *phydev)
311 if (phydev->duplex == DUPLEX_FULL) {
312 phydev->pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
313 phydev->lp_advertising);
314 phydev->asym_pause = linkmode_test_bit(
315 ETHTOOL_LINK_MODE_Asym_Pause_BIT,
316 phydev->lp_advertising);
319 EXPORT_SYMBOL_GPL(phy_resolve_aneg_pause);
322 * phy_resolve_aneg_linkmode - resolve the advertisements into phy settings
323 * @phydev: The phy_device struct
325 * Resolve our and the link partner advertisements into their corresponding
326 * speed and duplex. If full duplex was negotiated, extract the pause mode
327 * from the link partner mask.
329 void phy_resolve_aneg_linkmode(struct phy_device *phydev)
331 __ETHTOOL_DECLARE_LINK_MODE_MASK(common);
334 linkmode_and(common, phydev->lp_advertising, phydev->advertising);
336 for (i = 0; i < ARRAY_SIZE(settings); i++)
337 if (test_bit(settings[i].bit, common)) {
338 phydev->speed = settings[i].speed;
339 phydev->duplex = settings[i].duplex;
343 phy_resolve_aneg_pause(phydev);
345 EXPORT_SYMBOL_GPL(phy_resolve_aneg_linkmode);
348 * phy_check_downshift - check whether downshift occurred
349 * @phydev: The phy_device struct
351 * Check whether a downshift to a lower speed occurred. If this should be the
352 * case warn the user.
353 * Prerequisite for detecting downshift is that PHY driver implements the
354 * read_status callback and sets phydev->speed to the actual link speed.
356 void phy_check_downshift(struct phy_device *phydev)
358 __ETHTOOL_DECLARE_LINK_MODE_MASK(common);
359 int i, speed = SPEED_UNKNOWN;
361 phydev->downshifted_rate = 0;
363 if (phydev->autoneg == AUTONEG_DISABLE ||
364 phydev->speed == SPEED_UNKNOWN)
367 linkmode_and(common, phydev->lp_advertising, phydev->advertising);
369 for (i = 0; i < ARRAY_SIZE(settings); i++)
370 if (test_bit(settings[i].bit, common)) {
371 speed = settings[i].speed;
375 if (speed == SPEED_UNKNOWN || phydev->speed >= speed)
378 phydev_warn(phydev, "Downshift occurred from negotiated speed %s to actual speed %s, check cabling!\n",
379 phy_speed_to_str(speed), phy_speed_to_str(phydev->speed));
381 phydev->downshifted_rate = 1;
383 EXPORT_SYMBOL_GPL(phy_check_downshift);
385 static int phy_resolve_min_speed(struct phy_device *phydev, bool fdx_only)
387 __ETHTOOL_DECLARE_LINK_MODE_MASK(common);
388 int i = ARRAY_SIZE(settings);
390 linkmode_and(common, phydev->lp_advertising, phydev->advertising);
393 if (test_bit(settings[i].bit, common)) {
394 if (fdx_only && settings[i].duplex != DUPLEX_FULL)
396 return settings[i].speed;
400 return SPEED_UNKNOWN;
403 int phy_speed_down_core(struct phy_device *phydev)
405 int min_common_speed = phy_resolve_min_speed(phydev, true);
407 if (min_common_speed == SPEED_UNKNOWN)
410 return __set_linkmode_max_speed(min_common_speed, phydev->advertising);
413 static void mmd_phy_indirect(struct mii_bus *bus, int phy_addr, int devad,
416 /* Write the desired MMD Devad */
417 __mdiobus_write(bus, phy_addr, MII_MMD_CTRL, devad);
419 /* Write the desired MMD register address */
420 __mdiobus_write(bus, phy_addr, MII_MMD_DATA, regnum);
422 /* Select the Function : DATA with no post increment */
423 __mdiobus_write(bus, phy_addr, MII_MMD_CTRL,
424 devad | MII_MMD_CTRL_NOINCR);
428 * __phy_read_mmd - Convenience function for reading a register
429 * from an MMD on a given PHY.
430 * @phydev: The phy_device struct
431 * @devad: The MMD to read from (0..31)
432 * @regnum: The register on the MMD to read (0..65535)
434 * Same rules as for __phy_read();
436 int __phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum)
440 if (regnum > (u16)~0 || devad > 32)
443 if (phydev->drv && phydev->drv->read_mmd) {
444 val = phydev->drv->read_mmd(phydev, devad, regnum);
445 } else if (phydev->is_c45) {
446 val = __mdiobus_c45_read(phydev->mdio.bus, phydev->mdio.addr,
449 struct mii_bus *bus = phydev->mdio.bus;
450 int phy_addr = phydev->mdio.addr;
452 mmd_phy_indirect(bus, phy_addr, devad, regnum);
454 /* Read the content of the MMD's selected register */
455 val = __mdiobus_read(bus, phy_addr, MII_MMD_DATA);
459 EXPORT_SYMBOL(__phy_read_mmd);
462 * phy_read_mmd - Convenience function for reading a register
463 * from an MMD on a given PHY.
464 * @phydev: The phy_device struct
465 * @devad: The MMD to read from
466 * @regnum: The register on the MMD to read
468 * Same rules as for phy_read();
470 int phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum)
474 phy_lock_mdio_bus(phydev);
475 ret = __phy_read_mmd(phydev, devad, regnum);
476 phy_unlock_mdio_bus(phydev);
480 EXPORT_SYMBOL(phy_read_mmd);
483 * __phy_write_mmd - Convenience function for writing a register
484 * on an MMD on a given PHY.
485 * @phydev: The phy_device struct
486 * @devad: The MMD to read from
487 * @regnum: The register on the MMD to read
488 * @val: value to write to @regnum
490 * Same rules as for __phy_write();
492 int __phy_write_mmd(struct phy_device *phydev, int devad, u32 regnum, u16 val)
496 if (regnum > (u16)~0 || devad > 32)
499 if (phydev->drv && phydev->drv->write_mmd) {
500 ret = phydev->drv->write_mmd(phydev, devad, regnum, val);
501 } else if (phydev->is_c45) {
502 ret = __mdiobus_c45_write(phydev->mdio.bus, phydev->mdio.addr,
505 struct mii_bus *bus = phydev->mdio.bus;
506 int phy_addr = phydev->mdio.addr;
508 mmd_phy_indirect(bus, phy_addr, devad, regnum);
510 /* Write the data into MMD's selected register */
511 __mdiobus_write(bus, phy_addr, MII_MMD_DATA, val);
517 EXPORT_SYMBOL(__phy_write_mmd);
520 * phy_write_mmd - Convenience function for writing a register
521 * on an MMD on a given PHY.
522 * @phydev: The phy_device struct
523 * @devad: The MMD to read from
524 * @regnum: The register on the MMD to read
525 * @val: value to write to @regnum
527 * Same rules as for phy_write();
529 int phy_write_mmd(struct phy_device *phydev, int devad, u32 regnum, u16 val)
533 phy_lock_mdio_bus(phydev);
534 ret = __phy_write_mmd(phydev, devad, regnum, val);
535 phy_unlock_mdio_bus(phydev);
539 EXPORT_SYMBOL(phy_write_mmd);
542 * phy_modify_changed - Function for modifying a PHY register
543 * @phydev: the phy_device struct
544 * @regnum: register number to modify
545 * @mask: bit mask of bits to clear
546 * @set: new value of bits set in mask to write to @regnum
548 * NOTE: MUST NOT be called from interrupt context,
549 * because the bus read/write functions may wait for an interrupt
550 * to conclude the operation.
552 * Returns negative errno, 0 if there was no change, and 1 in case of change
554 int phy_modify_changed(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
558 phy_lock_mdio_bus(phydev);
559 ret = __phy_modify_changed(phydev, regnum, mask, set);
560 phy_unlock_mdio_bus(phydev);
564 EXPORT_SYMBOL_GPL(phy_modify_changed);
567 * __phy_modify - Convenience function for modifying a PHY register
568 * @phydev: the phy_device struct
569 * @regnum: register number to modify
570 * @mask: bit mask of bits to clear
571 * @set: new value of bits set in mask to write to @regnum
573 * NOTE: MUST NOT be called from interrupt context,
574 * because the bus read/write functions may wait for an interrupt
575 * to conclude the operation.
577 int __phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
581 ret = __phy_modify_changed(phydev, regnum, mask, set);
583 return ret < 0 ? ret : 0;
585 EXPORT_SYMBOL_GPL(__phy_modify);
588 * phy_modify - Convenience function for modifying a given PHY register
589 * @phydev: the phy_device struct
590 * @regnum: register number to write
591 * @mask: bit mask of bits to clear
592 * @set: new value of bits set in mask to write to @regnum
594 * NOTE: MUST NOT be called from interrupt context,
595 * because the bus read/write functions may wait for an interrupt
596 * to conclude the operation.
598 int phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
602 phy_lock_mdio_bus(phydev);
603 ret = __phy_modify(phydev, regnum, mask, set);
604 phy_unlock_mdio_bus(phydev);
608 EXPORT_SYMBOL_GPL(phy_modify);
611 * __phy_modify_mmd_changed - Function for modifying a register on MMD
612 * @phydev: the phy_device struct
613 * @devad: the MMD containing register to modify
614 * @regnum: register number to modify
615 * @mask: bit mask of bits to clear
616 * @set: new value of bits set in mask to write to @regnum
618 * Unlocked helper function which allows a MMD register to be modified as
619 * new register value = (old register value & ~mask) | set
621 * Returns negative errno, 0 if there was no change, and 1 in case of change
623 int __phy_modify_mmd_changed(struct phy_device *phydev, int devad, u32 regnum,
628 ret = __phy_read_mmd(phydev, devad, regnum);
632 new = (ret & ~mask) | set;
636 ret = __phy_write_mmd(phydev, devad, regnum, new);
638 return ret < 0 ? ret : 1;
640 EXPORT_SYMBOL_GPL(__phy_modify_mmd_changed);
643 * phy_modify_mmd_changed - Function for modifying a register on MMD
644 * @phydev: the phy_device struct
645 * @devad: the MMD containing register to modify
646 * @regnum: register number to modify
647 * @mask: bit mask of bits to clear
648 * @set: new value of bits set in mask to write to @regnum
650 * NOTE: MUST NOT be called from interrupt context,
651 * because the bus read/write functions may wait for an interrupt
652 * to conclude the operation.
654 * Returns negative errno, 0 if there was no change, and 1 in case of change
656 int phy_modify_mmd_changed(struct phy_device *phydev, int devad, u32 regnum,
661 phy_lock_mdio_bus(phydev);
662 ret = __phy_modify_mmd_changed(phydev, devad, regnum, mask, set);
663 phy_unlock_mdio_bus(phydev);
667 EXPORT_SYMBOL_GPL(phy_modify_mmd_changed);
670 * __phy_modify_mmd - Convenience function for modifying a register on MMD
671 * @phydev: the phy_device struct
672 * @devad: the MMD containing register to modify
673 * @regnum: register number to modify
674 * @mask: bit mask of bits to clear
675 * @set: new value of bits set in mask to write to @regnum
677 * NOTE: MUST NOT be called from interrupt context,
678 * because the bus read/write functions may wait for an interrupt
679 * to conclude the operation.
681 int __phy_modify_mmd(struct phy_device *phydev, int devad, u32 regnum,
686 ret = __phy_modify_mmd_changed(phydev, devad, regnum, mask, set);
688 return ret < 0 ? ret : 0;
690 EXPORT_SYMBOL_GPL(__phy_modify_mmd);
693 * phy_modify_mmd - Convenience function for modifying a register on MMD
694 * @phydev: the phy_device struct
695 * @devad: the MMD containing register to modify
696 * @regnum: register number to modify
697 * @mask: bit mask of bits to clear
698 * @set: new value of bits set in mask to write to @regnum
700 * NOTE: MUST NOT be called from interrupt context,
701 * because the bus read/write functions may wait for an interrupt
702 * to conclude the operation.
704 int phy_modify_mmd(struct phy_device *phydev, int devad, u32 regnum,
709 phy_lock_mdio_bus(phydev);
710 ret = __phy_modify_mmd(phydev, devad, regnum, mask, set);
711 phy_unlock_mdio_bus(phydev);
715 EXPORT_SYMBOL_GPL(phy_modify_mmd);
717 static int __phy_read_page(struct phy_device *phydev)
719 if (WARN_ONCE(!phydev->drv->read_page, "read_page callback not available, PHY driver not loaded?\n"))
722 return phydev->drv->read_page(phydev);
725 static int __phy_write_page(struct phy_device *phydev, int page)
727 if (WARN_ONCE(!phydev->drv->write_page, "write_page callback not available, PHY driver not loaded?\n"))
730 return phydev->drv->write_page(phydev, page);
734 * phy_save_page() - take the bus lock and save the current page
735 * @phydev: a pointer to a &struct phy_device
737 * Take the MDIO bus lock, and return the current page number. On error,
738 * returns a negative errno. phy_restore_page() must always be called
739 * after this, irrespective of success or failure of this call.
741 int phy_save_page(struct phy_device *phydev)
743 phy_lock_mdio_bus(phydev);
744 return __phy_read_page(phydev);
746 EXPORT_SYMBOL_GPL(phy_save_page);
749 * phy_select_page() - take the bus lock, save the current page, and set a page
750 * @phydev: a pointer to a &struct phy_device
751 * @page: desired page
753 * Take the MDIO bus lock to protect against concurrent access, save the
754 * current PHY page, and set the current page. On error, returns a
755 * negative errno, otherwise returns the previous page number.
756 * phy_restore_page() must always be called after this, irrespective
757 * of success or failure of this call.
759 int phy_select_page(struct phy_device *phydev, int page)
763 oldpage = ret = phy_save_page(phydev);
767 if (oldpage != page) {
768 ret = __phy_write_page(phydev, page);
775 EXPORT_SYMBOL_GPL(phy_select_page);
778 * phy_restore_page() - restore the page register and release the bus lock
779 * @phydev: a pointer to a &struct phy_device
780 * @oldpage: the old page, return value from phy_save_page() or phy_select_page()
781 * @ret: operation's return code
783 * Release the MDIO bus lock, restoring @oldpage if it is a valid page.
784 * This function propagates the earliest error code from the group of
788 * @oldpage if it was a negative value, otherwise
789 * @ret if it was a negative errno value, otherwise
790 * phy_write_page()'s negative value if it were in error, otherwise
793 int phy_restore_page(struct phy_device *phydev, int oldpage, int ret)
798 r = __phy_write_page(phydev, oldpage);
800 /* Propagate the operation return code if the page write
803 if (ret >= 0 && r < 0)
806 /* Propagate the phy page selection error code */
810 phy_unlock_mdio_bus(phydev);
814 EXPORT_SYMBOL_GPL(phy_restore_page);
817 * phy_read_paged() - Convenience function for reading a paged register
818 * @phydev: a pointer to a &struct phy_device
819 * @page: the page for the phy
820 * @regnum: register number
822 * Same rules as for phy_read().
824 int phy_read_paged(struct phy_device *phydev, int page, u32 regnum)
826 int ret = 0, oldpage;
828 oldpage = phy_select_page(phydev, page);
830 ret = __phy_read(phydev, regnum);
832 return phy_restore_page(phydev, oldpage, ret);
834 EXPORT_SYMBOL(phy_read_paged);
837 * phy_write_paged() - Convenience function for writing a paged register
838 * @phydev: a pointer to a &struct phy_device
839 * @page: the page for the phy
840 * @regnum: register number
841 * @val: value to write
843 * Same rules as for phy_write().
845 int phy_write_paged(struct phy_device *phydev, int page, u32 regnum, u16 val)
847 int ret = 0, oldpage;
849 oldpage = phy_select_page(phydev, page);
851 ret = __phy_write(phydev, regnum, val);
853 return phy_restore_page(phydev, oldpage, ret);
855 EXPORT_SYMBOL(phy_write_paged);
858 * phy_modify_paged_changed() - Function for modifying a paged register
859 * @phydev: a pointer to a &struct phy_device
860 * @page: the page for the phy
861 * @regnum: register number
862 * @mask: bit mask of bits to clear
863 * @set: bit mask of bits to set
865 * Returns negative errno, 0 if there was no change, and 1 in case of change
867 int phy_modify_paged_changed(struct phy_device *phydev, int page, u32 regnum,
870 int ret = 0, oldpage;
872 oldpage = phy_select_page(phydev, page);
874 ret = __phy_modify_changed(phydev, regnum, mask, set);
876 return phy_restore_page(phydev, oldpage, ret);
878 EXPORT_SYMBOL(phy_modify_paged_changed);
881 * phy_modify_paged() - Convenience function for modifying a paged register
882 * @phydev: a pointer to a &struct phy_device
883 * @page: the page for the phy
884 * @regnum: register number
885 * @mask: bit mask of bits to clear
886 * @set: bit mask of bits to set
888 * Same rules as for phy_read() and phy_write().
890 int phy_modify_paged(struct phy_device *phydev, int page, u32 regnum,
893 int ret = phy_modify_paged_changed(phydev, page, regnum, mask, set);
895 return ret < 0 ? ret : 0;
897 EXPORT_SYMBOL(phy_modify_paged);