diff options
Diffstat (limited to 'drivers/net/mii.c')
| -rw-r--r-- | drivers/net/mii.c | 667 |
1 files changed, 667 insertions, 0 deletions
diff --git a/drivers/net/mii.c b/drivers/net/mii.c new file mode 100644 index 000000000..f6a97c859 --- /dev/null +++ b/drivers/net/mii.c @@ -0,0 +1,667 @@ +/* + + mii.c: MII interface library + + Maintained by Jeff Garzik <jgarzik@pobox.com> + Copyright 2001,2002 Jeff Garzik + + Various code came from myson803.c and other files by + Donald Becker. Copyright: + + Written 1998-2002 by Donald Becker. + + This software may be used and distributed according + to the terms of the GNU General Public License (GPL), + incorporated herein by reference. Drivers based on + or derived from this code fall under the GPL and must + retain the authorship, copyright and license notice. + This file is not a complete program and may only be + used when the entire operating system is licensed + under the GPL. + + The author may be reached as becker@scyld.com, or C/O + Scyld Computing Corporation + 410 Severn Ave., Suite 210 + Annapolis MD 21403 + + + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/netdevice.h> +#include <linux/ethtool.h> +#include <linux/mii.h> + +static u32 mii_get_an(struct mii_if_info *mii, u16 addr) +{ + int advert; + + advert = mii->mdio_read(mii->dev, mii->phy_id, addr); + + return mii_lpa_to_ethtool_lpa_t(advert); +} + +/** + * mii_ethtool_gset - get settings that are specified in @ecmd + * @mii: MII interface + * @ecmd: requested ethtool_cmd + * + * The @ecmd parameter is expected to have been cleared before calling + * mii_ethtool_gset(). + * + * Returns 0 for success, negative on error. + */ +int mii_ethtool_gset(struct mii_if_info *mii, struct ethtool_cmd *ecmd) +{ + struct net_device *dev = mii->dev; + u16 bmcr, bmsr, ctrl1000 = 0, stat1000 = 0; + u32 nego; + + ecmd->supported = + (SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full | + SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full | + SUPPORTED_Autoneg | SUPPORTED_TP | SUPPORTED_MII); + if (mii->supports_gmii) + ecmd->supported |= SUPPORTED_1000baseT_Half | + SUPPORTED_1000baseT_Full; + + /* only supports twisted-pair */ + ecmd->port = PORT_MII; + + /* only supports internal transceiver */ + ecmd->transceiver = XCVR_INTERNAL; + + /* this isn't fully supported at higher layers */ + ecmd->phy_address = mii->phy_id; + ecmd->mdio_support = ETH_MDIO_SUPPORTS_C22; + + ecmd->advertising = ADVERTISED_TP | ADVERTISED_MII; + + bmcr = mii->mdio_read(dev, mii->phy_id, MII_BMCR); + bmsr = mii->mdio_read(dev, mii->phy_id, MII_BMSR); + if (mii->supports_gmii) { + ctrl1000 = mii->mdio_read(dev, mii->phy_id, MII_CTRL1000); + stat1000 = mii->mdio_read(dev, mii->phy_id, MII_STAT1000); + } + if (bmcr & BMCR_ANENABLE) { + ecmd->advertising |= ADVERTISED_Autoneg; + ecmd->autoneg = AUTONEG_ENABLE; + + ecmd->advertising |= mii_get_an(mii, MII_ADVERTISE); + if (mii->supports_gmii) + ecmd->advertising |= + mii_ctrl1000_to_ethtool_adv_t(ctrl1000); + + if (bmsr & BMSR_ANEGCOMPLETE) { + ecmd->lp_advertising = mii_get_an(mii, MII_LPA); + ecmd->lp_advertising |= + mii_stat1000_to_ethtool_lpa_t(stat1000); + } else { + ecmd->lp_advertising = 0; + } + + nego = ecmd->advertising & ecmd->lp_advertising; + + if (nego & (ADVERTISED_1000baseT_Full | + ADVERTISED_1000baseT_Half)) { + ethtool_cmd_speed_set(ecmd, SPEED_1000); + ecmd->duplex = !!(nego & ADVERTISED_1000baseT_Full); + } else if (nego & (ADVERTISED_100baseT_Full | + ADVERTISED_100baseT_Half)) { + ethtool_cmd_speed_set(ecmd, SPEED_100); + ecmd->duplex = !!(nego & ADVERTISED_100baseT_Full); + } else { + ethtool_cmd_speed_set(ecmd, SPEED_10); + ecmd->duplex = !!(nego & ADVERTISED_10baseT_Full); + } + } else { + ecmd->autoneg = AUTONEG_DISABLE; + + ethtool_cmd_speed_set(ecmd, + ((bmcr & BMCR_SPEED1000 && + (bmcr & BMCR_SPEED100) == 0) ? + SPEED_1000 : + ((bmcr & BMCR_SPEED100) ? + SPEED_100 : SPEED_10))); + ecmd->duplex = (bmcr & BMCR_FULLDPLX) ? DUPLEX_FULL : DUPLEX_HALF; + } + + mii->full_duplex = ecmd->duplex; + + /* ignore maxtxpkt, maxrxpkt for now */ + + return 0; +} + +/** + * mii_ethtool_get_link_ksettings - get settings that are specified in @cmd + * @mii: MII interface + * @cmd: requested ethtool_link_ksettings + * + * The @cmd parameter is expected to have been cleared before calling + * mii_ethtool_get_link_ksettings(). + */ +void mii_ethtool_get_link_ksettings(struct mii_if_info *mii, + struct ethtool_link_ksettings *cmd) +{ + struct net_device *dev = mii->dev; + u16 bmcr, bmsr, ctrl1000 = 0, stat1000 = 0; + u32 nego, supported, advertising, lp_advertising; + + supported = (SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full | + SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full | + SUPPORTED_Autoneg | SUPPORTED_TP | SUPPORTED_MII); + if (mii->supports_gmii) + supported |= SUPPORTED_1000baseT_Half | + SUPPORTED_1000baseT_Full; + + /* only supports twisted-pair */ + cmd->base.port = PORT_MII; + + /* this isn't fully supported at higher layers */ + cmd->base.phy_address = mii->phy_id; + cmd->base.mdio_support = ETH_MDIO_SUPPORTS_C22; + + advertising = ADVERTISED_TP | ADVERTISED_MII; + + bmcr = mii->mdio_read(dev, mii->phy_id, MII_BMCR); + bmsr = mii->mdio_read(dev, mii->phy_id, MII_BMSR); + if (mii->supports_gmii) { + ctrl1000 = mii->mdio_read(dev, mii->phy_id, MII_CTRL1000); + stat1000 = mii->mdio_read(dev, mii->phy_id, MII_STAT1000); + } + if (bmcr & BMCR_ANENABLE) { + advertising |= ADVERTISED_Autoneg; + cmd->base.autoneg = AUTONEG_ENABLE; + + advertising |= mii_get_an(mii, MII_ADVERTISE); + if (mii->supports_gmii) + advertising |= mii_ctrl1000_to_ethtool_adv_t(ctrl1000); + + if (bmsr & BMSR_ANEGCOMPLETE) { + lp_advertising = mii_get_an(mii, MII_LPA); + lp_advertising |= + mii_stat1000_to_ethtool_lpa_t(stat1000); + } else { + lp_advertising = 0; + } + + nego = advertising & lp_advertising; + + if (nego & (ADVERTISED_1000baseT_Full | + ADVERTISED_1000baseT_Half)) { + cmd->base.speed = SPEED_1000; + cmd->base.duplex = !!(nego & ADVERTISED_1000baseT_Full); + } else if (nego & (ADVERTISED_100baseT_Full | + ADVERTISED_100baseT_Half)) { + cmd->base.speed = SPEED_100; + cmd->base.duplex = !!(nego & ADVERTISED_100baseT_Full); + } else { + cmd->base.speed = SPEED_10; + cmd->base.duplex = !!(nego & ADVERTISED_10baseT_Full); + } + } else { + cmd->base.autoneg = AUTONEG_DISABLE; + + cmd->base.speed = ((bmcr & BMCR_SPEED1000 && + (bmcr & BMCR_SPEED100) == 0) ? + SPEED_1000 : + ((bmcr & BMCR_SPEED100) ? + SPEED_100 : SPEED_10)); + cmd->base.duplex = (bmcr & BMCR_FULLDPLX) ? + DUPLEX_FULL : DUPLEX_HALF; + + lp_advertising = 0; + } + + mii->full_duplex = cmd->base.duplex; + + ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported, + supported); + ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising, + advertising); + ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.lp_advertising, + lp_advertising); + + /* ignore maxtxpkt, maxrxpkt for now */ +} + +/** + * mii_ethtool_sset - set settings that are specified in @ecmd + * @mii: MII interface + * @ecmd: requested ethtool_cmd + * + * Returns 0 for success, negative on error. + */ +int mii_ethtool_sset(struct mii_if_info *mii, struct ethtool_cmd *ecmd) +{ + struct net_device *dev = mii->dev; + u32 speed = ethtool_cmd_speed(ecmd); + + if (speed != SPEED_10 && + speed != SPEED_100 && + speed != SPEED_1000) + return -EINVAL; + if (ecmd->duplex != DUPLEX_HALF && ecmd->duplex != DUPLEX_FULL) + return -EINVAL; + if (ecmd->port != PORT_MII) + return -EINVAL; + if (ecmd->transceiver != XCVR_INTERNAL) + return -EINVAL; + if (ecmd->phy_address != mii->phy_id) + return -EINVAL; + if (ecmd->autoneg != AUTONEG_DISABLE && ecmd->autoneg != AUTONEG_ENABLE) + return -EINVAL; + if ((speed == SPEED_1000) && (!mii->supports_gmii)) + return -EINVAL; + + /* ignore supported, maxtxpkt, maxrxpkt */ + + if (ecmd->autoneg == AUTONEG_ENABLE) { + u32 bmcr, advert, tmp; + u32 advert2 = 0, tmp2 = 0; + + if ((ecmd->advertising & (ADVERTISED_10baseT_Half | + ADVERTISED_10baseT_Full | + ADVERTISED_100baseT_Half | + ADVERTISED_100baseT_Full | + ADVERTISED_1000baseT_Half | + ADVERTISED_1000baseT_Full)) == 0) + return -EINVAL; + + /* advertise only what has been requested */ + advert = mii->mdio_read(dev, mii->phy_id, MII_ADVERTISE); + tmp = advert & ~(ADVERTISE_ALL | ADVERTISE_100BASE4); + if (mii->supports_gmii) { + advert2 = mii->mdio_read(dev, mii->phy_id, MII_CTRL1000); + tmp2 = advert2 & ~(ADVERTISE_1000HALF | ADVERTISE_1000FULL); + } + tmp |= ethtool_adv_to_mii_adv_t(ecmd->advertising); + + if (mii->supports_gmii) + tmp2 |= + ethtool_adv_to_mii_ctrl1000_t(ecmd->advertising); + if (advert != tmp) { + mii->mdio_write(dev, mii->phy_id, MII_ADVERTISE, tmp); + mii->advertising = tmp; + } + if ((mii->supports_gmii) && (advert2 != tmp2)) + mii->mdio_write(dev, mii->phy_id, MII_CTRL1000, tmp2); + + /* turn on autonegotiation, and force a renegotiate */ + bmcr = mii->mdio_read(dev, mii->phy_id, MII_BMCR); + bmcr |= (BMCR_ANENABLE | BMCR_ANRESTART); + mii->mdio_write(dev, mii->phy_id, MII_BMCR, bmcr); + + mii->force_media = 0; + } else { + u32 bmcr, tmp; + + /* turn off auto negotiation, set speed and duplexity */ + bmcr = mii->mdio_read(dev, mii->phy_id, MII_BMCR); + tmp = bmcr & ~(BMCR_ANENABLE | BMCR_SPEED100 | + BMCR_SPEED1000 | BMCR_FULLDPLX); + if (speed == SPEED_1000) + tmp |= BMCR_SPEED1000; + else if (speed == SPEED_100) + tmp |= BMCR_SPEED100; + if (ecmd->duplex == DUPLEX_FULL) { + tmp |= BMCR_FULLDPLX; + mii->full_duplex = 1; + } else + mii->full_duplex = 0; + if (bmcr != tmp) + mii->mdio_write(dev, mii->phy_id, MII_BMCR, tmp); + + mii->force_media = 1; + } + return 0; +} + +/** + * mii_ethtool_set_link_ksettings - set settings that are specified in @cmd + * @mii: MII interfaces + * @cmd: requested ethtool_link_ksettings + * + * Returns 0 for success, negative on error. + */ +int mii_ethtool_set_link_ksettings(struct mii_if_info *mii, + const struct ethtool_link_ksettings *cmd) +{ + struct net_device *dev = mii->dev; + u32 speed = cmd->base.speed; + + if (speed != SPEED_10 && + speed != SPEED_100 && + speed != SPEED_1000) + return -EINVAL; + if (cmd->base.duplex != DUPLEX_HALF && cmd->base.duplex != DUPLEX_FULL) + return -EINVAL; + if (cmd->base.port != PORT_MII) + return -EINVAL; + if (cmd->base.phy_address != mii->phy_id) + return -EINVAL; + if (cmd->base.autoneg != AUTONEG_DISABLE && + cmd->base.autoneg != AUTONEG_ENABLE) + return -EINVAL; + if ((speed == SPEED_1000) && (!mii->supports_gmii)) + return -EINVAL; + + /* ignore supported, maxtxpkt, maxrxpkt */ + + if (cmd->base.autoneg == AUTONEG_ENABLE) { + u32 bmcr, advert, tmp; + u32 advert2 = 0, tmp2 = 0; + u32 advertising; + + ethtool_convert_link_mode_to_legacy_u32( + &advertising, cmd->link_modes.advertising); + + if ((advertising & (ADVERTISED_10baseT_Half | + ADVERTISED_10baseT_Full | + ADVERTISED_100baseT_Half | + ADVERTISED_100baseT_Full | + ADVERTISED_1000baseT_Half | + ADVERTISED_1000baseT_Full)) == 0) + return -EINVAL; + + /* advertise only what has been requested */ + advert = mii->mdio_read(dev, mii->phy_id, MII_ADVERTISE); + tmp = advert & ~(ADVERTISE_ALL | ADVERTISE_100BASE4); + if (mii->supports_gmii) { + advert2 = mii->mdio_read(dev, mii->phy_id, + MII_CTRL1000); + tmp2 = advert2 & + ~(ADVERTISE_1000HALF | ADVERTISE_1000FULL); + } + tmp |= ethtool_adv_to_mii_adv_t(advertising); + + if (mii->supports_gmii) + tmp2 |= ethtool_adv_to_mii_ctrl1000_t(advertising); + if (advert != tmp) { + mii->mdio_write(dev, mii->phy_id, MII_ADVERTISE, tmp); + mii->advertising = tmp; + } + if ((mii->supports_gmii) && (advert2 != tmp2)) + mii->mdio_write(dev, mii->phy_id, MII_CTRL1000, tmp2); + + /* turn on autonegotiation, and force a renegotiate */ + bmcr = mii->mdio_read(dev, mii->phy_id, MII_BMCR); + bmcr |= (BMCR_ANENABLE | BMCR_ANRESTART); + mii->mdio_write(dev, mii->phy_id, MII_BMCR, bmcr); + + mii->force_media = 0; + } else { + u32 bmcr, tmp; + + /* turn off auto negotiation, set speed and duplexity */ + bmcr = mii->mdio_read(dev, mii->phy_id, MII_BMCR); + tmp = bmcr & ~(BMCR_ANENABLE | BMCR_SPEED100 | + BMCR_SPEED1000 | BMCR_FULLDPLX); + if (speed == SPEED_1000) + tmp |= BMCR_SPEED1000; + else if (speed == SPEED_100) + tmp |= BMCR_SPEED100; + if (cmd->base.duplex == DUPLEX_FULL) { + tmp |= BMCR_FULLDPLX; + mii->full_duplex = 1; + } else { + mii->full_duplex = 0; + } + if (bmcr != tmp) + mii->mdio_write(dev, mii->phy_id, MII_BMCR, tmp); + + mii->force_media = 1; + } + return 0; +} + +/** + * mii_check_gmii_support - check if the MII supports Gb interfaces + * @mii: the MII interface + */ +int mii_check_gmii_support(struct mii_if_info *mii) +{ + int reg; + + reg = mii->mdio_read(mii->dev, mii->phy_id, MII_BMSR); + if (reg & BMSR_ESTATEN) { + reg = mii->mdio_read(mii->dev, mii->phy_id, MII_ESTATUS); + if (reg & (ESTATUS_1000_TFULL | ESTATUS_1000_THALF)) + return 1; + } + + return 0; +} + +/** + * mii_link_ok - is link status up/ok + * @mii: the MII interface + * + * Returns 1 if the MII reports link status up/ok, 0 otherwise. + */ +int mii_link_ok (struct mii_if_info *mii) +{ + /* first, a dummy read, needed to latch some MII phys */ + mii->mdio_read(mii->dev, mii->phy_id, MII_BMSR); + if (mii->mdio_read(mii->dev, mii->phy_id, MII_BMSR) & BMSR_LSTATUS) + return 1; + return 0; +} + +/** + * mii_nway_restart - restart NWay (autonegotiation) for this interface + * @mii: the MII interface + * + * Returns 0 on success, negative on error. + */ +int mii_nway_restart (struct mii_if_info *mii) +{ + int bmcr; + int r = -EINVAL; + + /* if autoneg is off, it's an error */ + bmcr = mii->mdio_read(mii->dev, mii->phy_id, MII_BMCR); + + if (bmcr & BMCR_ANENABLE) { + bmcr |= BMCR_ANRESTART; + mii->mdio_write(mii->dev, mii->phy_id, MII_BMCR, bmcr); + r = 0; + } + + return r; +} + +/** + * mii_check_link - check MII link status + * @mii: MII interface + * + * If the link status changed (previous != current), call + * netif_carrier_on() if current link status is Up or call + * netif_carrier_off() if current link status is Down. + */ +void mii_check_link (struct mii_if_info *mii) +{ + int cur_link = mii_link_ok(mii); + int prev_link = netif_carrier_ok(mii->dev); + + if (cur_link && !prev_link) + netif_carrier_on(mii->dev); + else if (prev_link && !cur_link) + netif_carrier_off(mii->dev); +} + +/** + * mii_check_media - check the MII interface for a carrier/speed/duplex change + * @mii: the MII interface + * @ok_to_print: OK to print link up/down messages + * @init_media: OK to save duplex mode in @mii + * + * Returns 1 if the duplex mode changed, 0 if not. + * If the media type is forced, always returns 0. + */ +unsigned int mii_check_media (struct mii_if_info *mii, + unsigned int ok_to_print, + unsigned int init_media) +{ + unsigned int old_carrier, new_carrier; + int advertise, lpa, media, duplex; + int lpa2 = 0; + + /* check current and old link status */ + old_carrier = netif_carrier_ok(mii->dev) ? 1 : 0; + new_carrier = (unsigned int) mii_link_ok(mii); + + /* if carrier state did not change, this is a "bounce", + * just exit as everything is already set correctly + */ + if ((!init_media) && (old_carrier == new_carrier)) + return 0; /* duplex did not change */ + + /* no carrier, nothing much to do */ + if (!new_carrier) { + netif_carrier_off(mii->dev); + if (ok_to_print) + netdev_info(mii->dev, "link down\n"); + return 0; /* duplex did not change */ + } + + /* + * we have carrier, see who's on the other end + */ + netif_carrier_on(mii->dev); + + if (mii->force_media) { + if (ok_to_print) + netdev_info(mii->dev, "link up\n"); + return 0; /* duplex did not change */ + } + + /* get MII advertise and LPA values */ + if ((!init_media) && (mii->advertising)) + advertise = mii->advertising; + else { + advertise = mii->mdio_read(mii->dev, mii->phy_id, MII_ADVERTISE); + mii->advertising = advertise; + } + lpa = mii->mdio_read(mii->dev, mii->phy_id, MII_LPA); + if (mii->supports_gmii) + lpa2 = mii->mdio_read(mii->dev, mii->phy_id, MII_STAT1000); + + /* figure out media and duplex from advertise and LPA values */ + media = mii_nway_result(lpa & advertise); + duplex = (media & ADVERTISE_FULL) ? 1 : 0; + if (lpa2 & LPA_1000FULL) + duplex = 1; + + if (ok_to_print) + netdev_info(mii->dev, "link up, %uMbps, %s-duplex, lpa 0x%04X\n", + lpa2 & (LPA_1000FULL | LPA_1000HALF) ? 1000 : + media & (ADVERTISE_100FULL | ADVERTISE_100HALF) ? + 100 : 10, + duplex ? "full" : "half", + lpa); + + if ((init_media) || (mii->full_duplex != duplex)) { + mii->full_duplex = duplex; + return 1; /* duplex changed */ + } + + return 0; /* duplex did not change */ +} + +/** + * generic_mii_ioctl - main MII ioctl interface + * @mii_if: the MII interface + * @mii_data: MII ioctl data structure + * @cmd: MII ioctl command + * @duplex_chg_out: pointer to @duplex_changed status if there was no + * ioctl error + * + * Returns 0 on success, negative on error. + */ +int generic_mii_ioctl(struct mii_if_info *mii_if, + struct mii_ioctl_data *mii_data, int cmd, + unsigned int *duplex_chg_out) +{ + int rc = 0; + unsigned int duplex_changed = 0; + + if (duplex_chg_out) + *duplex_chg_out = 0; + + mii_data->phy_id &= mii_if->phy_id_mask; + mii_data->reg_num &= mii_if->reg_num_mask; + + switch(cmd) { + case SIOCGMIIPHY: + mii_data->phy_id = mii_if->phy_id; + fallthrough; + + case SIOCGMIIREG: + mii_data->val_out = + mii_if->mdio_read(mii_if->dev, mii_data->phy_id, + mii_data->reg_num); + break; + + case SIOCSMIIREG: { + u16 val = mii_data->val_in; + + if (mii_data->phy_id == mii_if->phy_id) { + switch(mii_data->reg_num) { + case MII_BMCR: { + unsigned int new_duplex = 0; + if (val & (BMCR_RESET|BMCR_ANENABLE)) + mii_if->force_media = 0; + else + mii_if->force_media = 1; + if (mii_if->force_media && + (val & BMCR_FULLDPLX)) + new_duplex = 1; + if (mii_if->full_duplex != new_duplex) { + duplex_changed = 1; + mii_if->full_duplex = new_duplex; + } + break; + } + case MII_ADVERTISE: + mii_if->advertising = val; + break; + default: + /* do nothing */ + break; + } + } + + mii_if->mdio_write(mii_if->dev, mii_data->phy_id, + mii_data->reg_num, val); + break; + } + + default: + rc = -EOPNOTSUPP; + break; + } + + if ((rc == 0) && (duplex_chg_out) && (duplex_changed)) + *duplex_chg_out = 1; + + return rc; +} + +MODULE_AUTHOR ("Jeff Garzik <jgarzik@pobox.com>"); +MODULE_DESCRIPTION ("MII hardware support library"); +MODULE_LICENSE("GPL"); + +EXPORT_SYMBOL(mii_link_ok); +EXPORT_SYMBOL(mii_nway_restart); +EXPORT_SYMBOL(mii_ethtool_gset); +EXPORT_SYMBOL(mii_ethtool_get_link_ksettings); +EXPORT_SYMBOL(mii_ethtool_sset); +EXPORT_SYMBOL(mii_ethtool_set_link_ksettings); +EXPORT_SYMBOL(mii_check_link); +EXPORT_SYMBOL(mii_check_media); +EXPORT_SYMBOL(mii_check_gmii_support); +EXPORT_SYMBOL(generic_mii_ioctl); + |