1 // SPDX-License-Identifier: GPL-2.0-only
3 * Clause 45 PHY support
5 #include <linux/ethtool.h>
6 #include <linux/export.h>
7 #include <linux/mdio.h>
12 * genphy_c45_setup_forced - configures a forced speed
13 * @phydev: target phy_device struct
15 int genphy_c45_pma_setup_forced(struct phy_device *phydev)
17 int ctrl1, ctrl2, ret;
19 /* Half duplex is not supported */
20 if (phydev->duplex != DUPLEX_FULL)
23 ctrl1 = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1);
27 ctrl2 = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL2);
31 ctrl1 &= ~MDIO_CTRL1_SPEEDSEL;
33 * PMA/PMD type selection is 1.7.5:0 not 1.7.3:0. See 45.2.1.6.1
34 * in 802.3-2012 and 802.3-2015.
36 ctrl2 &= ~(MDIO_PMA_CTRL2_TYPE | 0x30);
38 switch (phydev->speed) {
40 ctrl2 |= MDIO_PMA_CTRL2_10BT;
43 ctrl1 |= MDIO_PMA_CTRL1_SPEED100;
44 ctrl2 |= MDIO_PMA_CTRL2_100BTX;
47 ctrl1 |= MDIO_PMA_CTRL1_SPEED1000;
48 /* Assume 1000base-T */
49 ctrl2 |= MDIO_PMA_CTRL2_1000BT;
52 ctrl1 |= MDIO_CTRL1_SPEED2_5G;
53 /* Assume 2.5Gbase-T */
54 ctrl2 |= MDIO_PMA_CTRL2_2_5GBT;
57 ctrl1 |= MDIO_CTRL1_SPEED5G;
59 ctrl2 |= MDIO_PMA_CTRL2_5GBT;
62 ctrl1 |= MDIO_CTRL1_SPEED10G;
63 /* Assume 10Gbase-T */
64 ctrl2 |= MDIO_PMA_CTRL2_10GBT;
70 ret = phy_write_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1, ctrl1);
74 ret = phy_write_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL2, ctrl2);
78 return genphy_c45_an_disable_aneg(phydev);
80 EXPORT_SYMBOL_GPL(genphy_c45_pma_setup_forced);
83 * genphy_c45_an_config_aneg - configure advertisement registers
84 * @phydev: target phy_device struct
86 * Configure advertisement registers based on modes set in phydev->advertising
88 * Returns negative errno code on failure, 0 if advertisement didn't change,
89 * or 1 if advertised modes changed.
91 int genphy_c45_an_config_aneg(struct phy_device *phydev)
96 linkmode_and(phydev->advertising, phydev->advertising,
99 changed = genphy_config_eee_advert(phydev);
101 adv = linkmode_adv_to_mii_adv_t(phydev->advertising);
103 ret = phy_modify_mmd_changed(phydev, MDIO_MMD_AN, MDIO_AN_ADVERTISE,
104 ADVERTISE_ALL | ADVERTISE_100BASE4 |
105 ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM,
112 adv = linkmode_adv_to_mii_10gbt_adv_t(phydev->advertising);
114 ret = phy_modify_mmd_changed(phydev, MDIO_MMD_AN, MDIO_AN_10GBT_CTRL,
115 MDIO_AN_10GBT_CTRL_ADV10G |
116 MDIO_AN_10GBT_CTRL_ADV5G |
117 MDIO_AN_10GBT_CTRL_ADV2_5G, adv);
125 EXPORT_SYMBOL_GPL(genphy_c45_an_config_aneg);
128 * genphy_c45_an_disable_aneg - disable auto-negotiation
129 * @phydev: target phy_device struct
131 * Disable auto-negotiation in the Clause 45 PHY. The link parameters
132 * parameters are controlled through the PMA/PMD MMD registers.
134 * Returns zero on success, negative errno code on failure.
136 int genphy_c45_an_disable_aneg(struct phy_device *phydev)
139 return phy_clear_bits_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1,
140 MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART);
142 EXPORT_SYMBOL_GPL(genphy_c45_an_disable_aneg);
145 * genphy_c45_restart_aneg - Enable and restart auto-negotiation
146 * @phydev: target phy_device struct
148 * This assumes that the auto-negotiation MMD is present.
150 * Enable and restart auto-negotiation.
152 int genphy_c45_restart_aneg(struct phy_device *phydev)
154 return phy_set_bits_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1,
155 MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART);
157 EXPORT_SYMBOL_GPL(genphy_c45_restart_aneg);
160 * genphy_c45_check_and_restart_aneg - Enable and restart auto-negotiation
161 * @phydev: target phy_device struct
162 * @restart: whether aneg restart is requested
164 * This assumes that the auto-negotiation MMD is present.
166 * Check, and restart auto-negotiation if needed.
168 int genphy_c45_check_and_restart_aneg(struct phy_device *phydev, bool restart)
173 /* Configure and restart aneg if it wasn't set before */
174 ret = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1);
178 if (!(ret & MDIO_AN_CTRL1_ENABLE))
183 return genphy_c45_restart_aneg(phydev);
187 EXPORT_SYMBOL_GPL(genphy_c45_check_and_restart_aneg);
190 * genphy_c45_aneg_done - return auto-negotiation complete status
191 * @phydev: target phy_device struct
193 * This assumes that the auto-negotiation MMD is present.
195 * Reads the status register from the auto-negotiation MMD, returning:
196 * - positive if auto-negotiation is complete
197 * - negative errno code on error
200 int genphy_c45_aneg_done(struct phy_device *phydev)
202 int val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
204 return val < 0 ? val : val & MDIO_AN_STAT1_COMPLETE ? 1 : 0;
206 EXPORT_SYMBOL_GPL(genphy_c45_aneg_done);
209 * genphy_c45_read_link - read the overall link status from the MMDs
210 * @phydev: target phy_device struct
212 * Read the link status from the specified MMDs, and if they all indicate
213 * that the link is up, set phydev->link to 1. If an error is encountered,
214 * a negative errno will be returned, otherwise zero.
216 int genphy_c45_read_link(struct phy_device *phydev)
218 u32 mmd_mask = MDIO_DEVS_PMAPMD;
222 if (phydev->c45_ids.devices_in_package & MDIO_DEVS_AN) {
223 val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1);
227 /* Autoneg is being started, therefore disregard current
228 * link status and report link as down.
230 if (val & MDIO_AN_CTRL1_RESTART) {
236 while (mmd_mask && link) {
237 devad = __ffs(mmd_mask);
238 mmd_mask &= ~BIT(devad);
240 /* The link state is latched low so that momentary link
241 * drops can be detected. Do not double-read the status
242 * in polling mode to detect such short link drops except
243 * the link was already down.
245 if (!phy_polling_mode(phydev) || !phydev->link) {
246 val = phy_read_mmd(phydev, devad, MDIO_STAT1);
249 else if (val & MDIO_STAT1_LSTATUS)
253 val = phy_read_mmd(phydev, devad, MDIO_STAT1);
257 if (!(val & MDIO_STAT1_LSTATUS))
265 EXPORT_SYMBOL_GPL(genphy_c45_read_link);
268 * genphy_c45_read_lpa - read the link partner advertisement and pause
269 * @phydev: target phy_device struct
271 * Read the Clause 45 defined base (7.19) and 10G (7.33) status registers,
272 * filling in the link partner advertisement, pause and asym_pause members
273 * in @phydev. This assumes that the auto-negotiation MMD is present, and
274 * the backplane bit (7.48.0) is clear. Clause 45 PHY drivers are expected
275 * to fill in the remainder of the link partner advert from vendor registers.
277 int genphy_c45_read_lpa(struct phy_device *phydev)
281 val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
285 if (!(val & MDIO_AN_STAT1_COMPLETE)) {
286 linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
287 phydev->lp_advertising);
288 mii_10gbt_stat_mod_linkmode_lpa_t(phydev->lp_advertising, 0);
289 mii_adv_mod_linkmode_adv_t(phydev->lp_advertising, 0);
291 phydev->asym_pause = 0;
296 linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->lp_advertising,
297 val & MDIO_AN_STAT1_LPABLE);
299 /* Read the link partner's base page advertisement */
300 val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_LPA);
304 mii_adv_mod_linkmode_adv_t(phydev->lp_advertising, val);
305 phydev->pause = val & LPA_PAUSE_CAP ? 1 : 0;
306 phydev->asym_pause = val & LPA_PAUSE_ASYM ? 1 : 0;
308 /* Read the link partner's 10G advertisement */
309 val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_10GBT_STAT);
313 mii_10gbt_stat_mod_linkmode_lpa_t(phydev->lp_advertising, val);
317 EXPORT_SYMBOL_GPL(genphy_c45_read_lpa);
320 * genphy_c45_read_pma - read link speed etc from PMA
321 * @phydev: target phy_device struct
323 int genphy_c45_read_pma(struct phy_device *phydev)
327 linkmode_zero(phydev->lp_advertising);
329 val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1);
333 switch (val & MDIO_CTRL1_SPEEDSEL) {
335 phydev->speed = SPEED_10;
337 case MDIO_PMA_CTRL1_SPEED100:
338 phydev->speed = SPEED_100;
340 case MDIO_PMA_CTRL1_SPEED1000:
341 phydev->speed = SPEED_1000;
343 case MDIO_CTRL1_SPEED2_5G:
344 phydev->speed = SPEED_2500;
346 case MDIO_CTRL1_SPEED5G:
347 phydev->speed = SPEED_5000;
349 case MDIO_CTRL1_SPEED10G:
350 phydev->speed = SPEED_10000;
353 phydev->speed = SPEED_UNKNOWN;
357 phydev->duplex = DUPLEX_FULL;
361 EXPORT_SYMBOL_GPL(genphy_c45_read_pma);
364 * genphy_c45_read_mdix - read mdix status from PMA
365 * @phydev: target phy_device struct
367 int genphy_c45_read_mdix(struct phy_device *phydev)
371 if (phydev->speed == SPEED_10000) {
372 val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD,
373 MDIO_PMA_10GBT_SWAPPOL);
378 case MDIO_PMA_10GBT_SWAPPOL_ABNX | MDIO_PMA_10GBT_SWAPPOL_CDNX:
379 phydev->mdix = ETH_TP_MDI;
383 phydev->mdix = ETH_TP_MDI_X;
387 phydev->mdix = ETH_TP_MDI_INVALID;
394 EXPORT_SYMBOL_GPL(genphy_c45_read_mdix);
397 * genphy_c45_pma_read_abilities - read supported link modes from PMA
398 * @phydev: target phy_device struct
400 * Read the supported link modes from the PMA Status 2 (1.8) register. If bit
401 * 1.8.9 is set, the list of supported modes is build using the values in the
402 * PMA Extended Abilities (1.11) register, indicating 1000BASET an 10G related
403 * modes. If bit 1.11.14 is set, then the list is also extended with the modes
404 * in the 2.5G/5G PMA Extended register (1.21), indicating if 2.5GBASET and
405 * 5GBASET are supported.
407 int genphy_c45_pma_read_abilities(struct phy_device *phydev)
411 linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported);
412 if (phydev->c45_ids.devices_in_package & MDIO_DEVS_AN) {
413 val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
417 if (val & MDIO_AN_STAT1_ABLE)
418 linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
422 val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_STAT2);
426 linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseSR_Full_BIT,
428 val & MDIO_PMA_STAT2_10GBSR);
430 linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseLR_Full_BIT,
432 val & MDIO_PMA_STAT2_10GBLR);
434 linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseER_Full_BIT,
436 val & MDIO_PMA_STAT2_10GBER);
438 if (val & MDIO_PMA_STAT2_EXTABLE) {
439 val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_EXTABLE);
443 linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseLRM_Full_BIT,
445 val & MDIO_PMA_EXTABLE_10GBLRM);
446 linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
448 val & MDIO_PMA_EXTABLE_10GBT);
449 linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT,
451 val & MDIO_PMA_EXTABLE_10GBKX4);
452 linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseKR_Full_BIT,
454 val & MDIO_PMA_EXTABLE_10GBKR);
455 linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
457 val & MDIO_PMA_EXTABLE_1000BT);
458 linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseKX_Full_BIT,
460 val & MDIO_PMA_EXTABLE_1000BKX);
462 linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
464 val & MDIO_PMA_EXTABLE_100BTX);
465 linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
467 val & MDIO_PMA_EXTABLE_100BTX);
469 linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
471 val & MDIO_PMA_EXTABLE_10BT);
472 linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
474 val & MDIO_PMA_EXTABLE_10BT);
476 if (val & MDIO_PMA_EXTABLE_NBT) {
477 val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD,
478 MDIO_PMA_NG_EXTABLE);
482 linkmode_mod_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
484 val & MDIO_PMA_NG_EXTABLE_2_5GBT);
486 linkmode_mod_bit(ETHTOOL_LINK_MODE_5000baseT_Full_BIT,
488 val & MDIO_PMA_NG_EXTABLE_5GBT);
494 EXPORT_SYMBOL_GPL(genphy_c45_pma_read_abilities);
497 * genphy_c45_read_status - read PHY status
498 * @phydev: target phy_device struct
500 * Reads status from PHY and sets phy_device members accordingly.
502 int genphy_c45_read_status(struct phy_device *phydev)
506 ret = genphy_c45_read_link(phydev);
510 phydev->speed = SPEED_UNKNOWN;
511 phydev->duplex = DUPLEX_UNKNOWN;
513 phydev->asym_pause = 0;
515 if (phydev->autoneg == AUTONEG_ENABLE) {
516 ret = genphy_c45_read_lpa(phydev);
520 phy_resolve_aneg_linkmode(phydev);
522 ret = genphy_c45_read_pma(phydev);
527 EXPORT_SYMBOL_GPL(genphy_c45_read_status);
530 * genphy_c45_config_aneg - restart auto-negotiation or forced setup
531 * @phydev: target phy_device struct
533 * Description: If auto-negotiation is enabled, we configure the
534 * advertising, and then restart auto-negotiation. If it is not
535 * enabled, then we force a configuration.
537 int genphy_c45_config_aneg(struct phy_device *phydev)
539 bool changed = false;
542 if (phydev->autoneg == AUTONEG_DISABLE)
543 return genphy_c45_pma_setup_forced(phydev);
545 ret = genphy_c45_an_config_aneg(phydev);
551 return genphy_c45_check_and_restart_aneg(phydev, changed);
553 EXPORT_SYMBOL_GPL(genphy_c45_config_aneg);
555 /* The gen10g_* functions are the old Clause 45 stub */
557 int gen10g_config_aneg(struct phy_device *phydev)
561 EXPORT_SYMBOL_GPL(gen10g_config_aneg);
563 struct phy_driver genphy_c45_driver = {
564 .phy_id = 0xffffffff,
565 .phy_id_mask = 0xffffffff,
566 .name = "Generic Clause 45 PHY",
567 .read_status = genphy_c45_read_status,