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alistair23-linux/include/linux/mii.h
Vladimir Oltean 6c93099450 mii: Add helpers for parsing SGMII auto-negotiation 
Typically a MAC PCS auto-configures itself after it receives the
negotiated copper-side link settings from the PHY, but some MAC devices
are more special and need manual interpretation of the SGMII AN result.

In other cases, the PCS exposes the entire tx_config_reg base page as it
is transmitted on the wire during auto-negotiation, so it makes sense to
be able to decode the equivalent lp_advertised bit mask from the raw u16
(of course, "lp" considering the PCS to be the local PHY).

Therefore, add the bit definitions for the SGMII registers 4 and 5
(local device ability, link partner ability), as well as a link_mode
conversion helper that can be used to feed the AN results into
phy_resolve_aneg_linkmode.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-01-05 23:22:32 -08:00

578 lines
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* linux/mii.h: definitions for MII-compatible transceivers
* Originally drivers/net/sunhme.h.
*
* Copyright (C) 1996, 1999, 2001 David S. Miller (davem@redhat.com)
*/
#ifndef __LINUX_MII_H__
#define __LINUX_MII_H__
#include <linux/if.h>
#include <linux/linkmode.h>
#include <uapi/linux/mii.h>
struct ethtool_cmd;
struct mii_if_info {
int phy_id;
int advertising;
int phy_id_mask;
int reg_num_mask;
unsigned int full_duplex : 1; /* is full duplex? */
unsigned int force_media : 1; /* is autoneg. disabled? */
unsigned int supports_gmii : 1; /* are GMII registers supported? */
struct net_device *dev;
int (*mdio_read) (struct net_device *dev, int phy_id, int location);
void (*mdio_write) (struct net_device *dev, int phy_id, int location, int val);
};
extern int mii_link_ok (struct mii_if_info *mii);
extern int mii_nway_restart (struct mii_if_info *mii);
extern int mii_ethtool_gset(struct mii_if_info *mii, struct ethtool_cmd *ecmd);
extern void mii_ethtool_get_link_ksettings(
struct mii_if_info *mii, struct ethtool_link_ksettings *cmd);
extern int mii_ethtool_sset(struct mii_if_info *mii, struct ethtool_cmd *ecmd);
extern int mii_ethtool_set_link_ksettings(
struct mii_if_info *mii, const struct ethtool_link_ksettings *cmd);
extern int mii_check_gmii_support(struct mii_if_info *mii);
extern void mii_check_link (struct mii_if_info *mii);
extern unsigned int mii_check_media (struct mii_if_info *mii,
unsigned int ok_to_print,
unsigned int init_media);
extern int generic_mii_ioctl(struct mii_if_info *mii_if,
struct mii_ioctl_data *mii_data, int cmd,
unsigned int *duplex_changed);
static inline struct mii_ioctl_data *if_mii(struct ifreq *rq)
{
return (struct mii_ioctl_data *) &rq->ifr_ifru;
}
/**
* mii_nway_result
* @negotiated: value of MII ANAR and'd with ANLPAR
*
* Given a set of MII abilities, check each bit and returns the
* currently supported media, in the priority order defined by
* IEEE 802.3u. We use LPA_xxx constants but note this is not the
* value of LPA solely, as described above.
*
* The one exception to IEEE 802.3u is that 100baseT4 is placed
* between 100T-full and 100T-half. If your phy does not support
* 100T4 this is fine. If your phy places 100T4 elsewhere in the
* priority order, you will need to roll your own function.
*/
static inline unsigned int mii_nway_result (unsigned int negotiated)
{
unsigned int ret;
if (negotiated & LPA_100FULL)
ret = LPA_100FULL;
else if (negotiated & LPA_100BASE4)
ret = LPA_100BASE4;
else if (negotiated & LPA_100HALF)
ret = LPA_100HALF;
else if (negotiated & LPA_10FULL)
ret = LPA_10FULL;
else
ret = LPA_10HALF;
return ret;
}
/**
* mii_duplex
* @duplex_lock: Non-zero if duplex is locked at full
* @negotiated: value of MII ANAR and'd with ANLPAR
*
* A small helper function for a common case. Returns one
* if the media is operating or locked at full duplex, and
* returns zero otherwise.
*/
static inline unsigned int mii_duplex (unsigned int duplex_lock,
unsigned int negotiated)
{
if (duplex_lock)
return 1;
if (mii_nway_result(negotiated) & LPA_DUPLEX)
return 1;
return 0;
}
/**
* ethtool_adv_to_mii_adv_t
* @ethadv: the ethtool advertisement settings
*
* A small helper function that translates ethtool advertisement
* settings to phy autonegotiation advertisements for the
* MII_ADVERTISE register.
*/
static inline u32 ethtool_adv_to_mii_adv_t(u32 ethadv)
{
u32 result = 0;
if (ethadv & ADVERTISED_10baseT_Half)
result |= ADVERTISE_10HALF;
if (ethadv & ADVERTISED_10baseT_Full)
result |= ADVERTISE_10FULL;
if (ethadv & ADVERTISED_100baseT_Half)
result |= ADVERTISE_100HALF;
if (ethadv & ADVERTISED_100baseT_Full)
result |= ADVERTISE_100FULL;
if (ethadv & ADVERTISED_Pause)
result |= ADVERTISE_PAUSE_CAP;
if (ethadv & ADVERTISED_Asym_Pause)
result |= ADVERTISE_PAUSE_ASYM;
return result;
}
/**
* linkmode_adv_to_mii_adv_t
* @advertising: the linkmode advertisement settings
*
* A small helper function that translates linkmode advertisement
* settings to phy autonegotiation advertisements for the
* MII_ADVERTISE register.
*/
static inline u32 linkmode_adv_to_mii_adv_t(unsigned long *advertising)
{
u32 result = 0;
if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, advertising))
result |= ADVERTISE_10HALF;
if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, advertising))
result |= ADVERTISE_10FULL;
if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, advertising))
result |= ADVERTISE_100HALF;
if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, advertising))
result |= ADVERTISE_100FULL;
if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, advertising))
result |= ADVERTISE_PAUSE_CAP;
if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, advertising))
result |= ADVERTISE_PAUSE_ASYM;
return result;
}
/**
* mii_adv_to_ethtool_adv_t
* @adv: value of the MII_ADVERTISE register
*
* A small helper function that translates MII_ADVERTISE bits
* to ethtool advertisement settings.
*/
static inline u32 mii_adv_to_ethtool_adv_t(u32 adv)
{
u32 result = 0;
if (adv & ADVERTISE_10HALF)
result |= ADVERTISED_10baseT_Half;
if (adv & ADVERTISE_10FULL)
result |= ADVERTISED_10baseT_Full;
if (adv & ADVERTISE_100HALF)
result |= ADVERTISED_100baseT_Half;
if (adv & ADVERTISE_100FULL)
result |= ADVERTISED_100baseT_Full;
if (adv & ADVERTISE_PAUSE_CAP)
result |= ADVERTISED_Pause;
if (adv & ADVERTISE_PAUSE_ASYM)
result |= ADVERTISED_Asym_Pause;
return result;
}
/**
* ethtool_adv_to_mii_ctrl1000_t
* @ethadv: the ethtool advertisement settings
*
* A small helper function that translates ethtool advertisement
* settings to phy autonegotiation advertisements for the
* MII_CTRL1000 register when in 1000T mode.
*/
static inline u32 ethtool_adv_to_mii_ctrl1000_t(u32 ethadv)
{
u32 result = 0;
if (ethadv & ADVERTISED_1000baseT_Half)
result |= ADVERTISE_1000HALF;
if (ethadv & ADVERTISED_1000baseT_Full)
result |= ADVERTISE_1000FULL;
return result;
}
/**
* linkmode_adv_to_mii_ctrl1000_t
* @advertising: the linkmode advertisement settings
*
* A small helper function that translates linkmode advertisement
* settings to phy autonegotiation advertisements for the
* MII_CTRL1000 register when in 1000T mode.
*/
static inline u32 linkmode_adv_to_mii_ctrl1000_t(unsigned long *advertising)
{
u32 result = 0;
if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
advertising))
result |= ADVERTISE_1000HALF;
if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
advertising))
result |= ADVERTISE_1000FULL;
return result;
}
/**
* mii_ctrl1000_to_ethtool_adv_t
* @adv: value of the MII_CTRL1000 register
*
* A small helper function that translates MII_CTRL1000
* bits, when in 1000Base-T mode, to ethtool
* advertisement settings.
*/
static inline u32 mii_ctrl1000_to_ethtool_adv_t(u32 adv)
{
u32 result = 0;
if (adv & ADVERTISE_1000HALF)
result |= ADVERTISED_1000baseT_Half;
if (adv & ADVERTISE_1000FULL)
result |= ADVERTISED_1000baseT_Full;
return result;
}
/**
* mii_lpa_to_ethtool_lpa_t
* @adv: value of the MII_LPA register
*
* A small helper function that translates MII_LPA
* bits, when in 1000Base-T mode, to ethtool
* LP advertisement settings.
*/
static inline u32 mii_lpa_to_ethtool_lpa_t(u32 lpa)
{
u32 result = 0;
if (lpa & LPA_LPACK)
result |= ADVERTISED_Autoneg;
return result | mii_adv_to_ethtool_adv_t(lpa);
}
/**
* mii_stat1000_to_ethtool_lpa_t
* @adv: value of the MII_STAT1000 register
*
* A small helper function that translates MII_STAT1000
* bits, when in 1000Base-T mode, to ethtool
* advertisement settings.
*/
static inline u32 mii_stat1000_to_ethtool_lpa_t(u32 lpa)
{
u32 result = 0;
if (lpa & LPA_1000HALF)
result |= ADVERTISED_1000baseT_Half;
if (lpa & LPA_1000FULL)
result |= ADVERTISED_1000baseT_Full;
return result;
}
/**
* mii_stat1000_mod_linkmode_lpa_t
* @advertising: target the linkmode advertisement settings
* @adv: value of the MII_STAT1000 register
*
* A small helper function that translates MII_STAT1000 bits, when in
* 1000Base-T mode, to linkmode advertisement settings. Other bits in
* advertising are not changes.
*/
static inline void mii_stat1000_mod_linkmode_lpa_t(unsigned long *advertising,
u32 lpa)
{
linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
advertising, lpa & LPA_1000HALF);
linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
advertising, lpa & LPA_1000FULL);
}
/**
* ethtool_adv_to_mii_adv_x
* @ethadv: the ethtool advertisement settings
*
* A small helper function that translates ethtool advertisement
* settings to phy autonegotiation advertisements for the
* MII_CTRL1000 register when in 1000Base-X mode.
*/
static inline u32 ethtool_adv_to_mii_adv_x(u32 ethadv)
{
u32 result = 0;
if (ethadv & ADVERTISED_1000baseT_Half)
result |= ADVERTISE_1000XHALF;
if (ethadv & ADVERTISED_1000baseT_Full)
result |= ADVERTISE_1000XFULL;
if (ethadv & ADVERTISED_Pause)
result |= ADVERTISE_1000XPAUSE;
if (ethadv & ADVERTISED_Asym_Pause)
result |= ADVERTISE_1000XPSE_ASYM;
return result;
}
/**
* mii_adv_to_ethtool_adv_x
* @adv: value of the MII_CTRL1000 register
*
* A small helper function that translates MII_CTRL1000
* bits, when in 1000Base-X mode, to ethtool
* advertisement settings.
*/
static inline u32 mii_adv_to_ethtool_adv_x(u32 adv)
{
u32 result = 0;
if (adv & ADVERTISE_1000XHALF)
result |= ADVERTISED_1000baseT_Half;
if (adv & ADVERTISE_1000XFULL)
result |= ADVERTISED_1000baseT_Full;
if (adv & ADVERTISE_1000XPAUSE)
result |= ADVERTISED_Pause;
if (adv & ADVERTISE_1000XPSE_ASYM)
result |= ADVERTISED_Asym_Pause;
return result;
}
/**
* mii_lpa_to_ethtool_lpa_x
* @adv: value of the MII_LPA register
*
* A small helper function that translates MII_LPA
* bits, when in 1000Base-X mode, to ethtool
* LP advertisement settings.
*/
static inline u32 mii_lpa_to_ethtool_lpa_x(u32 lpa)
{
u32 result = 0;
if (lpa & LPA_LPACK)
result |= ADVERTISED_Autoneg;
return result | mii_adv_to_ethtool_adv_x(lpa);
}
/**
* mii_lpa_mod_linkmode_adv_sgmii
* @lp_advertising: pointer to destination link mode.
* @lpa: value of the MII_LPA register
*
* A small helper function that translates MII_LPA bits to
* linkmode advertisement settings for SGMII.
* Leaves other bits unchanged.
*/
static inline void
mii_lpa_mod_linkmode_lpa_sgmii(unsigned long *lp_advertising, u32 lpa)
{
u32 speed_duplex = lpa & LPA_SGMII_DPX_SPD_MASK;
linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, lp_advertising,
speed_duplex == LPA_SGMII_1000HALF);
linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, lp_advertising,
speed_duplex == LPA_SGMII_1000FULL);
linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, lp_advertising,
speed_duplex == LPA_SGMII_100HALF);
linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, lp_advertising,
speed_duplex == LPA_SGMII_100FULL);
linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, lp_advertising,
speed_duplex == LPA_SGMII_10HALF);
linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, lp_advertising,
speed_duplex == LPA_SGMII_10FULL);
}
/**
* mii_lpa_to_linkmode_adv_sgmii
* @advertising: pointer to destination link mode.
* @lpa: value of the MII_LPA register
*
* A small helper function that translates MII_ADVERTISE bits
* to linkmode advertisement settings when in SGMII mode.
* Clears the old value of advertising.
*/
static inline void mii_lpa_to_linkmode_lpa_sgmii(unsigned long *lp_advertising,
u32 lpa)
{
linkmode_zero(lp_advertising);
mii_lpa_mod_linkmode_lpa_sgmii(lp_advertising, lpa);
}
/**
* mii_adv_mod_linkmode_adv_t
* @advertising:pointer to destination link mode.
* @adv: value of the MII_ADVERTISE register
*
* A small helper function that translates MII_ADVERTISE bits to
* linkmode advertisement settings. Leaves other bits unchanged.
*/
static inline void mii_adv_mod_linkmode_adv_t(unsigned long *advertising,
u32 adv)
{
linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
advertising, adv & ADVERTISE_10HALF);
linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
advertising, adv & ADVERTISE_10FULL);
linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
advertising, adv & ADVERTISE_100HALF);
linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
advertising, adv & ADVERTISE_100FULL);
linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT, advertising,
adv & ADVERTISE_PAUSE_CAP);
linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
advertising, adv & ADVERTISE_PAUSE_ASYM);
}
/**
* mii_adv_to_linkmode_adv_t
* @advertising:pointer to destination link mode.
* @adv: value of the MII_ADVERTISE register
*
* A small helper function that translates MII_ADVERTISE bits
* to linkmode advertisement settings. Clears the old value
* of advertising.
*/
static inline void mii_adv_to_linkmode_adv_t(unsigned long *advertising,
u32 adv)
{
linkmode_zero(advertising);
mii_adv_mod_linkmode_adv_t(advertising, adv);
}
/**
* mii_lpa_to_linkmode_lpa_t
* @adv: value of the MII_LPA register
*
* A small helper function that translates MII_LPA bits, when in
* 1000Base-T mode, to linkmode LP advertisement settings. Clears the
* old value of advertising
*/
static inline void mii_lpa_to_linkmode_lpa_t(unsigned long *lp_advertising,
u32 lpa)
{
mii_adv_to_linkmode_adv_t(lp_advertising, lpa);
if (lpa & LPA_LPACK)
linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
lp_advertising);
}
/**
* mii_lpa_mod_linkmode_lpa_t
* @adv: value of the MII_LPA register
*
* A small helper function that translates MII_LPA bits, when in
* 1000Base-T mode, to linkmode LP advertisement settings. Leaves
* other bits unchanged.
*/
static inline void mii_lpa_mod_linkmode_lpa_t(unsigned long *lp_advertising,
u32 lpa)
{
mii_adv_mod_linkmode_adv_t(lp_advertising, lpa);
linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
lp_advertising, lpa & LPA_LPACK);
}
static inline void mii_ctrl1000_mod_linkmode_adv_t(unsigned long *advertising,
u32 ctrl1000)
{
linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, advertising,
ctrl1000 & ADVERTISE_1000HALF);
linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, advertising,
ctrl1000 & ADVERTISE_1000FULL);
}
/**
* linkmode_adv_to_lcl_adv_t
* @advertising:pointer to linkmode advertising
*
* A small helper function that translates linkmode advertising to LVL
* pause capabilities.
*/
static inline u32 linkmode_adv_to_lcl_adv_t(unsigned long *advertising)
{
u32 lcl_adv = 0;
if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
advertising))
lcl_adv |= ADVERTISE_PAUSE_CAP;
if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
advertising))
lcl_adv |= ADVERTISE_PAUSE_ASYM;
return lcl_adv;
}
/**
* mii_advertise_flowctrl - get flow control advertisement flags
* @cap: Flow control capabilities (FLOW_CTRL_RX, FLOW_CTRL_TX or both)
*/
static inline u16 mii_advertise_flowctrl(int cap)
{
u16 adv = 0;
if (cap & FLOW_CTRL_RX)
adv = ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM;
if (cap & FLOW_CTRL_TX)
adv ^= ADVERTISE_PAUSE_ASYM;
return adv;
}
/**
* mii_resolve_flowctrl_fdx
* @lcladv: value of MII ADVERTISE register
* @rmtadv: value of MII LPA register
*
* Resolve full duplex flow control as per IEEE 802.3-2005 table 28B-3
*/
static inline u8 mii_resolve_flowctrl_fdx(u16 lcladv, u16 rmtadv)
{
u8 cap = 0;
if (lcladv & rmtadv & ADVERTISE_PAUSE_CAP) {
cap = FLOW_CTRL_TX | FLOW_CTRL_RX;
} else if (lcladv & rmtadv & ADVERTISE_PAUSE_ASYM) {
if (lcladv & ADVERTISE_PAUSE_CAP)
cap = FLOW_CTRL_RX;
else if (rmtadv & ADVERTISE_PAUSE_CAP)
cap = FLOW_CTRL_TX;
}
return cap;
}
#endif /* __LINUX_MII_H__ */
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