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net: phylink: pcs: add 802.3 clause 22 helpers

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Implement helpers for PCS accessed via the MII bus using 802.3 clause
22 cycles, conforming to 802.3 clause 37 and Cisco SGMII specifications
for the advertisement word.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Russell King 2020-03-17 14:52:36 +00:00 committed by David S. Miller
parent 6cc7cf8125
commit 74db1c18d8
3 changed files with 217 additions and 0 deletions
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206
drivers/net/phy/phylink.c
View File

@ -2068,4 +2068,210 @@ void phylink_helper_basex_speed(struct phylink_link_state *state)
}
EXPORT_SYMBOL_GPL(phylink_helper_basex_speed);
static void phylink_decode_c37_word(struct phylink_link_state *state,
uint16_t config_reg, int speed)
{
bool tx_pause, rx_pause;
int fd_bit;
if (speed == SPEED_2500)
fd_bit = ETHTOOL_LINK_MODE_2500baseX_Full_BIT;
else
fd_bit = ETHTOOL_LINK_MODE_1000baseX_Full_BIT;
mii_lpa_mod_linkmode_x(state->lp_advertising, config_reg, fd_bit);
if (linkmode_test_bit(fd_bit, state->advertising) &&
linkmode_test_bit(fd_bit, state->lp_advertising)) {
state->speed = speed;
state->duplex = DUPLEX_FULL;
} else {
/* negotiation failure */
state->link = false;
}
linkmode_resolve_pause(state->advertising, state->lp_advertising,
&tx_pause, &rx_pause);
if (tx_pause)
state->pause |= MLO_PAUSE_TX;
if (rx_pause)
state->pause |= MLO_PAUSE_RX;
}
static void phylink_decode_sgmii_word(struct phylink_link_state *state,
uint16_t config_reg)
{
if (!(config_reg & LPA_SGMII_LINK)) {
state->link = false;
return;
}
switch (config_reg & LPA_SGMII_SPD_MASK) {
case LPA_SGMII_10:
state->speed = SPEED_10;
break;
case LPA_SGMII_100:
state->speed = SPEED_100;
break;
case LPA_SGMII_1000:
state->speed = SPEED_1000;
break;
default:
state->link = false;
return;
}
if (config_reg & LPA_SGMII_FULL_DUPLEX)
state->duplex = DUPLEX_FULL;
else
state->duplex = DUPLEX_HALF;
}
/**
* phylink_mii_c22_pcs_get_state() - read the MAC PCS state
* @pcs: a pointer to a &struct mdio_device.
* @state: a pointer to a &struct phylink_link_state.
*
* Helper for MAC PCS supporting the 802.3 clause 22 register set for
* clause 37 negotiation and/or SGMII control.
*
* Read the MAC PCS state from the MII device configured in @config and
* parse the Clause 37 or Cisco SGMII link partner negotiation word into
* the phylink @state structure. This is suitable to be directly plugged
* into the mac_pcs_get_state() member of the struct phylink_mac_ops
* structure.
*/
void phylink_mii_c22_pcs_get_state(struct mdio_device *pcs,
struct phylink_link_state *state)
{
struct mii_bus *bus = pcs->bus;
int addr = pcs->addr;
int bmsr, lpa;
bmsr = mdiobus_read(bus, addr, MII_BMSR);
lpa = mdiobus_read(bus, addr, MII_LPA);
if (bmsr < 0 || lpa < 0) {
state->link = false;
return;
}
state->link = !!(bmsr & BMSR_LSTATUS);
state->an_complete = !!(bmsr & BMSR_ANEGCOMPLETE);
if (!state->link)
return;
switch (state->interface) {
case PHY_INTERFACE_MODE_1000BASEX:
phylink_decode_c37_word(state, lpa, SPEED_1000);
break;
case PHY_INTERFACE_MODE_2500BASEX:
phylink_decode_c37_word(state, lpa, SPEED_2500);
break;
case PHY_INTERFACE_MODE_SGMII:
phylink_decode_sgmii_word(state, lpa);
break;
default:
state->link = false;
break;
}
}
EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_get_state);
/**
* phylink_mii_c22_pcs_set_advertisement() - configure the clause 37 PCS
* advertisement
* @pcs: a pointer to a &struct mdio_device.
* @state: a pointer to the state being configured.
*
* Helper for MAC PCS supporting the 802.3 clause 22 register set for
* clause 37 negotiation and/or SGMII control.
*
* Configure the clause 37 PCS advertisement as specified by @state. This
* does not trigger a renegotiation; phylink will do that via the
* mac_an_restart() method of the struct phylink_mac_ops structure.
*
* Returns negative error code on failure to configure the advertisement,
* zero if no change has been made, or one if the advertisement has changed.
*/
int phylink_mii_c22_pcs_set_advertisement(struct mdio_device *pcs,
const struct phylink_link_state *state)
{
struct mii_bus *bus = pcs->bus;
int addr = pcs->addr;
int val, ret;
u16 adv;
switch (state->interface) {
case PHY_INTERFACE_MODE_1000BASEX:
case PHY_INTERFACE_MODE_2500BASEX:
adv = ADVERTISE_1000XFULL;
if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
state->advertising))
adv |= ADVERTISE_1000XPAUSE;
if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
state->advertising))
adv |= ADVERTISE_1000XPSE_ASYM;
val = mdiobus_read(bus, addr, MII_ADVERTISE);
if (val < 0)
return val;
if (val == adv)
return 0;
ret = mdiobus_write(bus, addr, MII_ADVERTISE, adv);
if (ret < 0)
return ret;
return 1;
case PHY_INTERFACE_MODE_SGMII:
val = mdiobus_read(bus, addr, MII_ADVERTISE);
if (val < 0)
return val;
if (val == 0x0001)
return 0;
ret = mdiobus_write(bus, addr, MII_ADVERTISE, 0x0001);
if (ret < 0)
return ret;
return 1;
default:
/* Nothing to do for other modes */
return 0;
}
}
EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_set_advertisement);
/**
* phylink_mii_c22_pcs_an_restart() - restart 802.3z autonegotiation
* @pcs: a pointer to a &struct mdio_device.
*
* Helper for MAC PCS supporting the 802.3 clause 22 register set for
* clause 37 negotiation.
*
* Restart the clause 37 negotiation with the link partner. This is
* suitable to be directly plugged into the mac_pcs_get_state() member
* of the struct phylink_mac_ops structure.
*/
void phylink_mii_c22_pcs_an_restart(struct mdio_device *pcs)
{
struct mii_bus *bus = pcs->bus;
int val, addr = pcs->addr;
val = mdiobus_read(bus, addr, MII_BMCR);
if (val >= 0) {
val |= BMCR_ANRESTART;
mdiobus_write(bus, addr, MII_BMCR, val);
}
}
EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_an_restart);
MODULE_LICENSE("GPL v2");

6
include/linux/phylink.h
View File

@ -317,4 +317,10 @@ int phylink_mii_ioctl(struct phylink *, struct ifreq *, int);
void phylink_set_port_modes(unsigned long *bits);
void phylink_helper_basex_speed(struct phylink_link_state *state);
void phylink_mii_c22_pcs_get_state(struct mdio_device *pcs,
struct phylink_link_state *state);
int phylink_mii_c22_pcs_set_advertisement(struct mdio_device *pcs,
const struct phylink_link_state *state);
void phylink_mii_c22_pcs_an_restart(struct mdio_device *pcs);
#endif

5
include/uapi/linux/mii.h
View File

@ -134,11 +134,16 @@
/* MAC and PHY tx_config_Reg[15:0] for SGMII in-band auto-negotiation.*/
#define ADVERTISE_SGMII 0x0001 /* MAC can do SGMII */
#define LPA_SGMII 0x0001 /* PHY can do SGMII */
#define LPA_SGMII_SPD_MASK 0x0c00 /* SGMII speed mask */
#define LPA_SGMII_FULL_DUPLEX 0x1000 /* SGMII full duplex */
#define LPA_SGMII_DPX_SPD_MASK 0x1C00 /* SGMII duplex and speed bits */
#define LPA_SGMII_10 0x0000 /* 10Mbps */
#define LPA_SGMII_10HALF 0x0000 /* Can do 10mbps half-duplex */
#define LPA_SGMII_10FULL 0x1000 /* Can do 10mbps full-duplex */
#define LPA_SGMII_100 0x0400 /* 100Mbps */
#define LPA_SGMII_100HALF 0x0400 /* Can do 100mbps half-duplex */
#define LPA_SGMII_100FULL 0x1400 /* Can do 100mbps full-duplex */
#define LPA_SGMII_1000 0x0800 /* 1000Mbps */
#define LPA_SGMII_1000HALF 0x0800 /* Can do 1000mbps half-duplex */
#define LPA_SGMII_1000FULL 0x1800 /* Can do 1000mbps full-duplex */
#define LPA_SGMII_LINK 0x8000 /* PHY link with copper-side partner */