/*
* mdio.c: Generic support for MDIO-compatible transceivers
* Copyright 2006-2009 Solarflare Communications Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, incorporated herein by reference.
*/
#include <linux/kernel.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/ethtool.h>
#include <linux/mdio.h>
#include <linux/module.h>
MODULE_DESCRIPTION("Generic support for MDIO-compatible transceivers");
MODULE_AUTHOR("Copyright 2006-2009 Solarflare Communications Inc.");
MODULE_LICENSE("GPL");
/**
* mdio45_probe - probe for an MDIO (clause 45) device
* @mdio: MDIO interface
* @prtad: Expected PHY address
*
* This sets @prtad and @mmds in the MDIO interface if successful.
* Returns 0 on success, negative on error.
*/
int mdio45_probe(struct mdio_if_info *mdio, int prtad)
{
int mmd, stat2, devs1, devs2;
/* Assume PHY must have at least one of PMA/PMD, WIS, PCS, PHY
* XS or DTE XS; give up if none is present. */
for (mmd = 1; mmd <= 5; mmd++) {
/* Is this MMD present? */
stat2 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_STAT2);
if (stat2 < 0 ||
(stat2 & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL)
continue;
/* It should tell us about all the other MMDs */
devs1 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_DEVS1);
devs2 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_DEVS2);
if (devs1 < 0 || devs2 < 0)
continue;
mdio->prtad = prtad;
mdio->mmds = devs1 | (devs2 << 16);
return 0;
}
return -ENODEV;
}
EXPORT_SYMBOL(mdio45_probe);
/**
* mdio_set_flag - set or clear flag in an MDIO register
* @mdio: MDIO interface
* @prtad: PHY address
* @devad: MMD address
* @addr: Register address
* @mask: Mask for flag (single bit set)
* @sense: New value of flag
*
* This debounces changes: it does not write the register if the flag
* already has the proper value. Returns 0 on success, negative on error.
*/
int mdio_set_flag(const struct mdio_if_info *mdio,
int prtad, int devad, u16 addr, int mask,
bool sense)
{
int old_val = mdio->mdio_read(mdio->dev, prtad, devad, addr);
int new_val;
if (old_val < 0)
return old_val;
if (sense)
new_val = old_val | mask;
else
new_val = old_val & ~mask;
if (old_val == new_val)
return 0;
return mdio->mdio_write(mdio->dev, prtad, devad, addr, new_val);
}
EXPORT_SYMBOL(mdio_set_flag);
/**
* mdio_link_ok - is link status up/OK
* @mdio: MDIO interface
* @mmd_mask: Mask for MMDs to check
*
* Returns 1 if the PHY reports link status up/OK, 0 otherwise.
* @mmd_mask is normally @mdio->mmds, but if loopback is enabled
* the MMDs being bypassed should be excluded from the mask.
*/
int mdio45_links_ok(const struct mdio_if_info *mdio, u32 mmd_mask)
{
int devad, reg;
if (!mmd_mask) {
/* Use absence of XGMII faults in lieu of link state */
reg = mdio->mdio_read(mdio->dev, mdio->prtad,
MDIO_MMD_PHYXS, MDIO_STAT2);
return reg >= 0 && !(reg & MDIO_STAT2_RXFAULT);
}
for (devad = 0; mmd_mask; devad++) {
if (mmd_mask & (1 << devad)) {
mmd_mask &= ~(1 << devad);
/* Reset the latched status and fault flags */
mdio->mdio_read(mdio->dev, mdio->prtad,
devad, MDIO_STAT1);
if (devad == MDIO_MMD_PMAPMD || devad == MDIO_MMD_PCS ||
devad == MDIO_MMD_PHYXS || devad == MDIO_MMD_DTEXS)
mdio->mdio_read(mdio->dev, mdio->prtad,
devad, MDIO_STAT2);
/* Check the current status and fault flags */
reg = mdio->mdio_read(mdio->dev, mdio->prtad,
devad, MDIO_STAT1);
if (reg < 0 ||
(reg & (MDIO_STAT1_FAULT | MDIO_STAT1_LSTATUS)) !=
MDIO_STAT1_LSTATUS)
return false;
}
}
return true;
}
EXPORT_SYMBOL(mdio45_links_ok);
/**
* mdio45_nway_restart - restart auto-negotiation for this interface
* @mdio: MDIO interface
*
* Returns 0 on success, negative on error.
*/
int mdio45_nway_restart(const struct mdio_if_info *mdio)
{
if (!(mdio->mmds & MDIO_DEVS_AN))
return -EOPNOTSUPP;
mdio_set_flag(mdio, mdio->prtad, MDIO_MMD_AN, MDIO_CTRL1,
MDIO_AN_CTRL1_RESTART, true);
return 0;
}
EXPORT_SYMBOL(mdio45_nway_restart);
static u32 mdio45_get_an(const struct mdio_if_info *mdio, u16 addr)
{
u32 result = 0;
int reg;
reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, addr);
if (reg & ADVERTISE_10HALF)
result |= ADVERTISED_10baseT_Half;
if (reg & ADVERTISE_10FULL)
result |= ADVERTISED_10baseT_Full;
if (reg & ADVERTISE_100HALF)
result |= ADVERTISED_100baseT_Half;
if (reg & ADVERTISE_100FULL)
result |= ADVERTISED_100baseT_Full;
if (reg & ADVERTISE_PAUSE_CAP)
result |= ADVERTISED_Pause;
if (reg & ADVERTISE_PAUSE_ASYM)
result |= ADVERTISED_Asym_Pause;
return result;
}
/**
* mdio45_ethtool_gset_npage - get settings for ETHTOOL_GSET
* @mdio: MDIO interface
* @ecmd: Ethtool request structure
* @npage_adv: Modes currently advertised on next pages
* @npage_lpa: Modes advertised by link partner on next pages
*
* The @ecmd parameter is expected to have been cleared before calling
* mdio45_ethtool_gset_npage().
*
* Since the CSRs for auto-negotiation using next pages are not fully
* standardised, this function does not attempt to decode them. The
* caller must pass them in.
*/
void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
struct ethtool_cmd *ecmd,
u32 npage_adv, u32 npage_lpa)
{
int reg;
u32 speed;
BUILD_BUG_ON(MDIO_SUPPORTS_C22 != ETH_MDIO_SUPPORTS_C22);
BUILD_BUG_ON(MDIO_SUPPORTS_C45 != ETH_MDIO_SUPPORTS_C45);
ecmd->transceiver = XCVR_INTERNAL;
ecmd->phy_address = mdio->prtad;
ecmd->mdio_support =
mdio->mode_support & (MDIO_SUPPORTS_C45 | MDIO_SUPPORTS_C22);
reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
MDIO_CTRL2);
switch (reg & MDIO_PMA_CTRL2_TYPE) {
case MDIO_PMA_CTRL2_10GBT:
case MDIO_PMA_CTRL2_1000BT:
case MDIO_PMA_CTRL2_100BTX:
case MDIO_PMA_CTRL2_10BT:
ecmd->port = PORT_TP;
ecmd->supported = SUPPORTED_TP;
reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
MDIO_SPEED);
if (reg & MDIO_SPEED_10G)
ecmd->supported |= SUPPORTED_10000baseT_Full;
if (reg & MDIO_PMA_SPEED_1000)
ecmd->supported |= (SUPPORTED_1000baseT_Full |
SUPPORTED_1000baseT_Half);
if (reg & MDIO_PMA_SPEED_100)
ecmd->supported |= (SUPPORTED_100baseT_Full |
SUPPORTED_100baseT_Half);
if (reg & MDIO_PMA_SPEED_10)
ecmd->supported |= (SUPPORTED_10baseT_Full |
SUPPORTED_10baseT_Half);
ecmd->advertising = ADVERTISED_TP;
break;
case MDIO_PMA_CTRL2_10GBCX4:
ecmd->port = PORT_OTHER;
ecmd->supported = 0;
ecmd->advertising = 0;
break;
case MDIO_PMA_CTRL2_10GBKX4:
case MDIO_PMA_CTRL2_10GBKR:
case MDIO_PMA_CTRL2_1000BKX:
ecmd->port = PORT_OTHER;
ecmd->supported = SUPPORTED_Backplane;
reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
MDIO_PMA_EXTABLE);
if (reg & MDIO_PMA_EXTABLE_10GBKX4)
ecmd->supported |= SUPPORTED_10000baseKX4_Full;
if (reg & MDIO_PMA_EXTABLE_10GBKR)
ecmd->supported |= SUPPORTED_10000baseKR_Full;
if (reg & MDIO_PMA_EXTABLE_1000BKX)
ecmd->supported |= SUPPORTED_1000baseKX_Full;
reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
MDIO_PMA_10GBR_FECABLE);
if (reg & MDIO_PMA_10GBR_FECABLE_ABLE)
ecmd->supported |= SUPPORTED_10000baseR_FEC;
ecmd->advertising = ADVERTISED_Backplane;
break;
/* All the other defined modes are flavours of optical */
default:
ecmd->port = PORT_FIBRE;
ecmd->supported = SUPPORTED_FIBRE;
ecmd->advertising = ADVERTISED_FIBRE;
break;
}
if (mdio->mmds & MDIO_DEVS_AN) {
ecmd->supported |= SUPPORTED_Autoneg;
reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
MDIO_CTRL1);
if (reg & MDIO_AN_CTRL1_ENABLE) {
ecmd->autoneg = AUTONEG_ENABLE;
ecmd->advertising |=
ADVERTISED_Autoneg |
mdio45_get_an(mdio, MDIO_AN_A
