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net: phy: add support for clause 37 auto-negotiation

This patch adds support for clause 37 1000Base-X auto-negotiation.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Tao Ren <taoren@fb.com>
Tested-by: René van Dorst <opensource@vdorst.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Heiner Kallweit 2019-10-22 11:31:07 -07:00 committed by David S. Miller
parent e7312efbd5
commit fa6e98cee5
2 changed files with 143 additions and 0 deletions

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@ -1607,6 +1607,40 @@ static int genphy_config_advert(struct phy_device *phydev)
return changed;
}
/**
* genphy_c37_config_advert - sanitize and advertise auto-negotiation parameters
* @phydev: target phy_device struct
*
* Description: Writes MII_ADVERTISE with the appropriate values,
* after sanitizing the values to make sure we only advertise
* what is supported. Returns < 0 on error, 0 if the PHY's advertisement
* hasn't changed, and > 0 if it has changed. This function is intended
* for Clause 37 1000Base-X mode.
*/
static int genphy_c37_config_advert(struct phy_device *phydev)
{
u16 adv = 0;
/* Only allow advertising what this PHY supports */
linkmode_and(phydev->advertising, phydev->advertising,
phydev->supported);
if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
phydev->advertising))
adv |= ADVERTISE_1000XFULL;
if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
phydev->advertising))
adv |= ADVERTISE_1000XPAUSE;
if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
phydev->advertising))
adv |= ADVERTISE_1000XPSE_ASYM;
return phy_modify_changed(phydev, MII_ADVERTISE,
ADVERTISE_1000XFULL | ADVERTISE_1000XPAUSE |
ADVERTISE_1000XHALF | ADVERTISE_1000XPSE_ASYM,
adv);
}
/**
* genphy_config_eee_advert - disable unwanted eee mode advertisement
* @phydev: target phy_device struct
@ -1715,6 +1749,54 @@ int __genphy_config_aneg(struct phy_device *phydev, bool changed)
}
EXPORT_SYMBOL(__genphy_config_aneg);
/**
* genphy_c37_config_aneg - restart auto-negotiation or write BMCR
* @phydev: target phy_device struct
*
* Description: If auto-negotiation is enabled, we configure the
* advertising, and then restart auto-negotiation. If it is not
* enabled, then we write the BMCR. This function is intended
* for use with Clause 37 1000Base-X mode.
*/
int genphy_c37_config_aneg(struct phy_device *phydev)
{
int err, changed;
if (phydev->autoneg != AUTONEG_ENABLE)
return genphy_setup_forced(phydev);
err = phy_modify(phydev, MII_BMCR, BMCR_SPEED1000 | BMCR_SPEED100,
BMCR_SPEED1000);
if (err)
return err;
changed = genphy_c37_config_advert(phydev);
if (changed < 0) /* error */
return changed;
if (!changed) {
/* Advertisement hasn't changed, but maybe aneg was never on to
* begin with? Or maybe phy was isolated?
*/
int ctl = phy_read(phydev, MII_BMCR);
if (ctl < 0)
return ctl;
if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
changed = 1; /* do restart aneg */
}
/* Only restart aneg if we are advertising something different
* than we were before.
*/
if (changed > 0)
return genphy_restart_aneg(phydev);
return 0;
}
EXPORT_SYMBOL(genphy_c37_config_aneg);
/**
* genphy_aneg_done - return auto-negotiation status
* @phydev: target phy_device struct
@ -1886,6 +1968,63 @@ int genphy_read_status(struct phy_device *phydev)
}
EXPORT_SYMBOL(genphy_read_status);
/**
* genphy_c37_read_status - check the link status and update current link state
* @phydev: target phy_device struct
*
* Description: Check the link, then figure out the current state
* by comparing what we advertise with what the link partner
* advertises. This function is for Clause 37 1000Base-X mode.
*/
int genphy_c37_read_status(struct phy_device *phydev)
{
int lpa, err, old_link = phydev->link;
/* Update the link, but return if there was an error */
err = genphy_update_link(phydev);
if (err)
return err;
/* why bother the PHY if nothing can have changed */
if (phydev->autoneg == AUTONEG_ENABLE && old_link && phydev->link)
return 0;
phydev->duplex = DUPLEX_UNKNOWN;
phydev->pause = 0;
phydev->asym_pause = 0;
if (phydev->autoneg == AUTONEG_ENABLE && phydev->autoneg_complete) {
lpa = phy_read(phydev, MII_LPA);
if (lpa < 0)
return lpa;
linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
phydev->lp_advertising, lpa & LPA_LPACK);
linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
phydev->lp_advertising, lpa & LPA_1000XFULL);
linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT,
phydev->lp_advertising, lpa & LPA_1000XPAUSE);
linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
phydev->lp_advertising,
lpa & LPA_1000XPAUSE_ASYM);
phy_resolve_aneg_linkmode(phydev);
} else if (phydev->autoneg == AUTONEG_DISABLE) {
int bmcr = phy_read(phydev, MII_BMCR);
if (bmcr < 0)
return bmcr;
if (bmcr & BMCR_FULLDPLX)
phydev->duplex = DUPLEX_FULL;
else
phydev->duplex = DUPLEX_HALF;
}
return 0;
}
EXPORT_SYMBOL(genphy_c37_read_status);
/**
* genphy_soft_reset - software reset the PHY via BMCR_RESET bit
* @phydev: target phy_device struct

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@ -1106,6 +1106,10 @@ int genphy_read_mmd_unsupported(struct phy_device *phdev, int devad,
int genphy_write_mmd_unsupported(struct phy_device *phdev, int devnum,
u16 regnum, u16 val);
/* Clause 37 */
int genphy_c37_config_aneg(struct phy_device *phydev);
int genphy_c37_read_status(struct phy_device *phydev);
/* Clause 45 PHY */
int genphy_c45_restart_aneg(struct phy_device *phydev);
int genphy_c45_check_and_restart_aneg(struct phy_device *phydev, bool restart);