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net: phylink: add helper function to decode USXGMII word

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With the new addition of the USXGMII link partner ability constants we
can now introduce a phylink helper that decodes the USXGMII word and
populates the appropriate fields in the phylink_link_state structure
based on them.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Reviewed-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ioana Ciornei 2020-08-30 11:33:58 +03:00 committed by David S. Miller
parent d60432994e
commit afd6220999
2 changed files with 46 additions and 0 deletions
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43
drivers/net/phy/phylink.c
View File

@ -2320,6 +2320,49 @@ static void phylink_decode_sgmii_word(struct phylink_link_state *state,
state->duplex = DUPLEX_HALF;
}
/**
* phylink_decode_usxgmii_word() - decode the USXGMII word from a MAC PCS
* @state: a pointer to a struct phylink_link_state.
* @lpa: a 16 bit value which stores the USXGMII auto-negotiation word
*
* Helper for MAC PCS supporting the USXGMII protocol and the auto-negotiation
* code word. Decode the USXGMII code word and populate the corresponding fields
* (speed, duplex) into the phylink_link_state structure.
*/
void phylink_decode_usxgmii_word(struct phylink_link_state *state,
uint16_t lpa)
{
switch (lpa & MDIO_USXGMII_SPD_MASK) {
case MDIO_USXGMII_10:
state->speed = SPEED_10;
break;
case MDIO_USXGMII_100:
state->speed = SPEED_100;
break;
case MDIO_USXGMII_1000:
state->speed = SPEED_1000;
break;
case MDIO_USXGMII_2500:
state->speed = SPEED_2500;
break;
case MDIO_USXGMII_5000:
state->speed = SPEED_5000;
break;
case MDIO_USXGMII_10G:
state->speed = SPEED_10000;
break;
default:
state->link = false;
return;
}
if (lpa & MDIO_USXGMII_FULL_DUPLEX)
state->duplex = DUPLEX_FULL;
else
state->duplex = DUPLEX_HALF;
}
EXPORT_SYMBOL_GPL(phylink_decode_usxgmii_word);
/**
* phylink_mii_c22_pcs_get_state() - read the MAC PCS state
* @pcs: a pointer to a &struct mdio_device.

3
include/linux/phylink.h
View File

@ -490,4 +490,7 @@ void phylink_mii_c22_pcs_an_restart(struct mdio_device *pcs);
void phylink_mii_c45_pcs_get_state(struct mdio_device *pcs,
struct phylink_link_state *state);
void phylink_decode_usxgmii_word(struct phylink_link_state *state,
uint16_t lpa);
#endif