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linux/drivers/net/mdio.c

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mdio: Add generic MDIO (clause 45) support functions These roughly mirror many of the MII library functions and are based on code from the sfc driver. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-04-29 01:04:46 -07:00
/*
* 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>
/**
* 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);
/* Read twice because link state is latched and a
* read moves the current state into the register */
mdio->mdio_read(mdio->dev, mdio->prtad,
devad, MDIO_STAT1);
reg = mdio->mdio_read(mdio->dev, mdio->prtad,
devad, MDIO_STAT1);
if (reg < 0 || !(reg & 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;
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
*
* 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;
ecmd->transceiver = XCVR_INTERNAL;
ecmd->phy_address = mdio->prtad;
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:
case MDIO_PMA_CTRL2_10GBKX4:
case MDIO_PMA_CTRL2_10GBKR:
case MDIO_PMA_CTRL2_1000BKX:
ecmd->port = PORT_OTHER;
ecmd->supported = 0;
ecmd->advertising = 0;
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_ADVERTISE) |
npage_adv;
} else {
ecmd->autoneg = AUTONEG_DISABLE;
}
} else {
ecmd->autoneg = AUTONEG_DISABLE;
}
if (ecmd->autoneg) {
u32 modes = 0;
/* If AN is complete and successful, report best common
* mode, otherwise report best advertised mode. */
if (mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
MDIO_STAT1) &
MDIO_AN_STAT1_COMPLETE)
modes = (ecmd->advertising &
(mdio45_get_an(mdio, MDIO_AN_LPA) |
npage_lpa));
if (modes == 0)
modes = ecmd->advertising;
if (modes & ADVERTISED_10000baseT_Full) {
ecmd->speed = SPEED_10000;
ecmd->duplex = DUPLEX_FULL;
} else if (modes & (ADVERTISED_1000baseT_Full |
ADVERTISED_1000baseT_Half)) {
ecmd->speed = SPEED_1000;
ecmd->duplex = !!(modes & ADVERTISED_1000baseT_Full);
} else if (modes & (ADVERTISED_100baseT_Full |
ADVERTISED_100baseT_Half)) {
ecmd->speed = SPEED_100;
ecmd->duplex = !!(modes & ADVERTISED_100baseT_Full);
} else {
ecmd->speed = SPEED_10;
ecmd->duplex = !!(modes & ADVERTISED_10baseT_Full);
}
} else {
/* Report forced settings */
reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
MDIO_CTRL1);
ecmd->speed = (((reg & MDIO_PMA_CTRL1_SPEED1000) ? 100 : 1) *
((reg & MDIO_PMA_CTRL1_SPEED100) ? 100 : 10));
ecmd->duplex = (reg & MDIO_CTRL1_FULLDPLX ||
ecmd->speed == SPEED_10000);
}
}
EXPORT_SYMBOL(mdio45_ethtool_gset_npage);
/**
* mdio_mii_ioctl - MII ioctl interface for MDIO (clause 22 or 45) PHYs
* @mdio: MDIO interface
* @mii_data: MII ioctl data structure
* @cmd: MII ioctl command
*
* Returns 0 on success, negative on error.
*/
int mdio_mii_ioctl(const struct mdio_if_info *mdio,
struct mii_ioctl_data *mii_data, int cmd)
{
int prtad, devad;
u16 addr = mii_data->reg_num;
/* Validate/convert cmd to one of SIOC{G,S}MIIREG */
switch (cmd) {
case SIOCGMIIPHY:
if (mdio->prtad == MDIO_PRTAD_NONE)
return -EOPNOTSUPP;
mii_data->phy_id = mdio->prtad;
cmd = SIOCGMIIREG;
break;
case SIOCGMIIREG:
break;
case SIOCSMIIREG:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
break;
default:
return -EOPNOTSUPP;
}
/* Validate/convert phy_id */
if ((mdio->mode_support & MDIO_SUPPORTS_C45) &&
mdio_phy_id_is_c45(mii_data->phy_id)) {
prtad = mdio_phy_id_prtad(mii_data->phy_id);
devad = mdio_phy_id_devad(mii_data->phy_id);
} else if ((mdio->mode_support & MDIO_SUPPORTS_C22) &&
mii_data->phy_id < 0x20) {
prtad = mii_data->phy_id;
devad = MDIO_DEVAD_NONE;
addr &= 0x1f;
} else if ((mdio->mode_support & MDIO_EMULATE_C22) &&
mdio->prtad != MDIO_PRTAD_NONE &&
mii_data->phy_id == mdio->prtad) {
/* Remap commonly-used MII registers. */
prtad = mdio->prtad;
switch (addr) {
case MII_BMCR:
case MII_BMSR:
case MII_PHYSID1:
case MII_PHYSID2:
devad = __ffs(mdio->mmds);
break;
case MII_ADVERTISE:
case MII_LPA:
if (!(mdio->mmds & MDIO_DEVS_AN))
return -EINVAL;
devad = MDIO_MMD_AN;
if (addr == MII_ADVERTISE)
addr = MDIO_AN_ADVERTISE;
else
addr = MDIO_AN_LPA;
break;
default:
return -EINVAL;
}
} else {
return -EINVAL;
}
if (cmd == SIOCGMIIREG) {
int rc = mdio->mdio_read(mdio->dev, prtad, devad, addr);
if (rc < 0)
return rc;
mii_data->val_out = rc;
return 0;
} else {
return mdio->mdio_write(mdio->dev, prtad, devad, addr,
mii_data->val_in);
}
}
EXPORT_SYMBOL(mdio_mii_ioctl);
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