/*
* Clause 45 PHY support
*/
#include <linux/ethtool.h>
#include <linux/export.h>
#include <linux/mdio.h>
#include <linux/mii.h>
#include <linux/phy.h>
/**
* genphy_c45_setup_forced - configures a forced speed
* @phydev: target phy_device struct
*/
int genphy_c45_pma_setup_forced(struct phy_device *phydev)
{
int ctrl1, ctrl2, ret;
/* Half duplex is not supported */
if (phydev->duplex != DUPLEX_FULL)
return -EINVAL;
ctrl1 = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1);
if (ctrl1 < 0)
return ctrl1;
ctrl2 = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL2);
if (ctrl2 < 0)
return ctrl2;
ctrl1 &= ~MDIO_CTRL1_SPEEDSEL;
/*
* PMA/PMD type selection is 1.7.5:0 not 1.7.3:0. See 45.2.1.6.1
* in 802.3-2012 and 802.3-2015.
*/
ctrl2 &= ~(MDIO_PMA_CTRL2_TYPE | 0x30);
switch (phydev->speed) {
case SPEED_10:
ctrl2 |= MDIO_PMA_CTRL2_10BT;
break;
case SPEED_100:
ctrl1 |= MDIO_PMA_CTRL1_SPEED100;
ctrl2 |= MDIO_PMA_CTRL2_100BTX;
break;
case SPEED_1000:
ctrl1 |= MDIO_PMA_CTRL1_SPEED1000;
/* Assume 1000base-T */
ctrl2 |= MDIO_PMA_CTRL2_1000BT;
break;
case SPEED_10000:
ctrl1 |= MDIO_CTRL1_SPEED10G;
/* Assume 10Gbase-T */
ctrl2 |= MDIO_PMA_CTRL2_10GBT;
break;
default:
return -EINVAL;
}
ret = phy_write_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1, ctrl1);
if (ret < 0)
return ret;
return phy_write_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL2, ctrl2);
}
EXPORT_SYMBOL_GPL(genphy_c45_pma_setup_forced);
/**
* genphy_c45_an_disable_aneg - disable auto-negotiation
* @phydev: target phy_device struct
*
* Disable auto-negotiation in the Clause 45 PHY. The link parameters
* parameters are controlled through the PMA/PMD MMD registers.
*
* Returns zero on success, negative errno code on failure.
*/
int genphy_c45_an_disable_aneg(struct phy_device *phydev)
{
int val;
val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1);
if (val < 0)
return val;
val &= ~(MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART);
return phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1, val);
}
EXPORT_SYMBOL_GPL(genphy_c45_an_disable_aneg);
/**
* genphy_c45_restart_aneg - Enable and restart auto-negotiation
* @phydev: target phy_device struct
*
* This assumes that the auto-negotiation MMD is present.
*
* Enable and restart auto-negotiation.
*/
int genphy_c45_restart_aneg(struct phy_device *phydev)
{
int val;
val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1);
if (val < 0)
return val;
val |= MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART;
return phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1, val);
}
EXPORT_SYMBOL_GPL(genphy_c45_restart_aneg);
/**
* genphy_c45_aneg_done - return auto-negotiation complete status
* @phydev: target phy_device struct
*
* This assumes that the auto-negotiation MMD is present.
*
* Reads the status register from the auto-negotiation MMD, returning:
* - positive if auto-negotiation is complete
* - negative errno code on error
* - zero otherwise
*/
int genphy_c45_aneg_done(struct phy_device *phydev)
{
int val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
return val < 0 ? val : val & MDIO_AN_STAT1_COMPLETE ? 1 : 0;
}
EXPORT_SYMBOL_GPL(genphy_c45_aneg_done);
/**
* genphy_c45_read_link - read the overall link status from the MMDs
* @phydev: target phy_device struct
* @mmd_mask: MMDs to read status from
*
* Read the link status from the specified MMDs, and if they all indicate
* that the link is up, return positive. If an error is encountered,
* a negative errno will be returned, otherwise zero.
*/
int genphy_c45_read_link(struct phy_device *phydev, u32 mmd_mask)
{
int val, devad;
bool link = true;
while (mmd_mask) {
devad = __ffs(mmd_mask);
mmd_mask &= ~BIT(devad);
/* The link state is latched low so that momentary link
* drops can be detected. Do not double-read the status
* register if the link is down.
*/
val = phy_read_mmd(phydev, devad, MDIO_STAT1);
if (val < 0)
return val;
if (!(val & MDIO_STAT1_LSTATUS))
link = false;
}
return link;
}
EXPORT_SYMBOL_GPL(genphy_c45_read_link);
/**
* genphy_c45_read_lpa - read the link partner advertisment and pause
* @phydev: target phy_device struct
*
* Read the Clause 45 defined base (7.19) and 10G (7.33) status registers,
* filling in the link partner advertisment, pause and asym_pause members
* in @phydev. This assumes that the auto-negotiation MMD is present, and
* the backplane bit (7.48.0) is clear. Clause 45 PHY drivers are expected
* to fill in the remainder of the link partner advert from vendor registers.
*/
int genphy_c45_read_lpa(struct phy_device *phydev)
{
int val;
/* Read the link partner's base page advertisment */
val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_LPA);
if (val < 0)
return val;
phydev->lp_advertising = mii_lpa_to_ethtool_lpa_t(val);
phydev->pause = val & LPA_PAUSE_CAP ? 1 : 0;
phydev->asym_pause = val & LPA_PAUSE_ASYM ? 1 : 0;
/* Read the link partner's 10G advertisment */
val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_10GBT_STAT);
if (val < 0)
return val;
if (val & MDIO_AN_10GBT_STAT_LP10G)
phydev->lp_advertising |= ADVERTISED_10000baseT_Full;
return 0;
}
EXPORT_SYMBOL_GPL(genphy_c45_read_lpa);
/**
* genphy_c45_read_pma - read link speed etc from PMA
* @phydev: target phy_device struct
*/
int genphy_c45_read_pma(struct phy_device *phydev)
{
int val;
val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1);
if (val < 0)
return val;
switch (val & MDIO_CTRL1_SPEEDSEL) {
case 0:
phydev->speed = SPEED_10;
break;
case MDIO_PMA_CTRL1_SPEED100:
phydev->speed = SPEED_100;
break;
case MDIO_PMA_CTRL1_SPEED1000:
phydev->speed = SPEED_1000;
break;
case MDIO_CTRL1_SPEED10G:
phydev->speed = SPEED_10000;
break;
default:
phydev->speed = SPEED_UNKNOWN;
break;
}
phydev->duplex = DUPLEX_FULL;
return 0;
}
EXPORT_SYMBOL_GPL(genphy_c45_read_pma);
/**
* genphy_c45_read_mdix - read mdix status from PMA
* @phydev: target phy_device struct
*/
int genphy_c45_read_mdix(struct phy_device *phydev)
{
int val;
if (phydev->speed == SPEED_10000) {
val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD,
MDIO_PMA_10GBT_SWAPPOL);
if (val < 0)
return val;
switch (val) {
case MDIO_PMA_10GBT_SWAPPOL_ABNX | MDIO_PMA_10GBT_SWAPPOL_CDNX:
phydev->mdix = ETH_TP_MDI;
break;
case 0:
phydev->mdix = ETH_TP_MDI_X;
break;
default:
phydev->mdix = ETH_TP_MDI_INVALID;
break;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(genphy_c45_read_mdix);
/* The gen10g_* functions are the old Clause 45 stub */
static int gen10g_config_aneg(struct phy_device *phydev)
{
return 0;
}
static int gen10g_read_status(struct phy_device *phydev)
{
u32 mmd_mask = phydev->c45_ids.devices_in_package;
int ret;
/* For now just lie and say it's 10G all the time */
phydev->speed = SPEED_10000;
phydev->duplex = DUPLEX_FULL;
/* Avoid reading the vendor MMDs */
mmd_mask &= ~(BIT(MDIO_MMD_VEND1) | BIT(MDIO_MMD_VEND2));
ret = genphy_c45_read_link(phydev, mmd_mask);
phydev->link = ret > 0 ? 1 : 0;
return 0;
}
static int gen10g_soft_reset(struct phy_device *phydev)
{
/* Do nothing for now */
return 0;
}
static int gen10g_config_init(struct phy_device *phydev)
{
/* Temporarily just say we support everything */
phydev->supported = SUPPORTED_10000baseT_Full;
phydev->advertising = SUPPORTED_10000baseT_Full;
return 0;
}
static int gen10g_suspend(struct phy_device *phydev)
{
return 0;
}
static int gen10g_resume(struct phy_device *phydev)
{
return 0;
}
struct phy_driver genphy_10g_driver = {
.phy_id = 0xffffffff,
.phy_id_mask = 0xffffffff,
.name = "Generic 10G PHY",
.soft_reset = gen10g_soft_reset,
.config_init = gen10g_config_init,
.features = 0,
.config_aneg = gen10g_config_aneg,
.read_status = gen10g_read_status,
.suspend = gen10g_suspend,
.resume = gen10g_resume,
};
