mii.c
上传用户:jlfgdled
上传日期:2013-04-10
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文件大小:9k
- /*
- mii.c: MII interface library
- Maintained by Jeff Garzik <jgarzik@mandrakesoft.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>
- int mii_ethtool_gset(struct mii_if_info *mii, struct ethtool_cmd *ecmd)
- {
- struct net_device *dev = mii->dev;
- u32 advert, bmcr, lpa, nego;
- ecmd->supported =
- (SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full |
- SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full |
- SUPPORTED_Autoneg | SUPPORTED_TP | SUPPORTED_MII);
- /* 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->advertising = ADVERTISED_TP | ADVERTISED_MII;
- advert = mii->mdio_read(dev, mii->phy_id, MII_ADVERTISE);
- if (advert & ADVERTISE_10HALF)
- ecmd->advertising |= ADVERTISED_10baseT_Half;
- if (advert & ADVERTISE_10FULL)
- ecmd->advertising |= ADVERTISED_10baseT_Full;
- if (advert & ADVERTISE_100HALF)
- ecmd->advertising |= ADVERTISED_100baseT_Half;
- if (advert & ADVERTISE_100FULL)
- ecmd->advertising |= ADVERTISED_100baseT_Full;
- bmcr = mii->mdio_read(dev, mii->phy_id, MII_BMCR);
- lpa = mii->mdio_read(dev, mii->phy_id, MII_LPA);
- if (bmcr & BMCR_ANENABLE) {
- ecmd->advertising |= ADVERTISED_Autoneg;
- ecmd->autoneg = AUTONEG_ENABLE;
-
- nego = mii_nway_result(advert & lpa);
- if (nego == LPA_100FULL || nego == LPA_100HALF)
- ecmd->speed = SPEED_100;
- else
- ecmd->speed = SPEED_10;
- if (nego == LPA_100FULL || nego == LPA_10FULL) {
- ecmd->duplex = DUPLEX_FULL;
- mii->full_duplex = 1;
- } else {
- ecmd->duplex = DUPLEX_HALF;
- mii->full_duplex = 0;
- }
- } else {
- ecmd->autoneg = AUTONEG_DISABLE;
- ecmd->speed = (bmcr & BMCR_SPEED100) ? SPEED_100 : SPEED_10;
- ecmd->duplex = (bmcr & BMCR_FULLDPLX) ? DUPLEX_FULL : DUPLEX_HALF;
- }
- /* ignore maxtxpkt, maxrxpkt for now */
- return 0;
- }
- int mii_ethtool_sset(struct mii_if_info *mii, struct ethtool_cmd *ecmd)
- {
- struct net_device *dev = mii->dev;
- if (ecmd->speed != SPEED_10 && ecmd->speed != SPEED_100)
- 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;
-
- /* ignore supported, maxtxpkt, maxrxpkt */
-
- if (ecmd->autoneg == AUTONEG_ENABLE) {
- u32 bmcr, advert, tmp;
- if ((ecmd->advertising & (ADVERTISED_10baseT_Half |
- ADVERTISED_10baseT_Full |
- ADVERTISED_100baseT_Half |
- ADVERTISED_100baseT_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 (ADVERTISED_10baseT_Half)
- tmp |= ADVERTISE_10HALF;
- if (ADVERTISED_10baseT_Full)
- tmp |= ADVERTISE_10FULL;
- if (ADVERTISED_100baseT_Half)
- tmp |= ADVERTISE_100HALF;
- if (ADVERTISED_100baseT_Full)
- tmp |= ADVERTISE_100FULL;
- if (advert != tmp) {
- mii->mdio_write(dev, mii->phy_id, MII_ADVERTISE, tmp);
- mii->advertising = tmp;
- }
-
- /* 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_FULLDPLX);
- if (ecmd->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;
- }
- 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;
- }
- 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;
- }
- 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);
- }
- 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;
- /* if forced media, go no further */
- if (mii->force_media)
- return 0; /* duplex did not change */
- /* 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)
- printk(KERN_INFO "%s: link downn", mii->dev->name);
- return 0; /* duplex did not change */
- }
- /*
- * we have carrier, see who's on the other end
- */
- netif_carrier_on(mii->dev);
- /* 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);
- /* figure out media and duplex from advertise and LPA values */
- media = mii_nway_result(lpa & advertise);
- duplex = (media & ADVERTISE_FULL) ? 1 : 0;
- if (ok_to_print)
- printk(KERN_INFO "%s: link up, %sMbps, %s-duplex, lpa 0x%04Xn",
- mii->dev->name,
- 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 */
- }
- 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 SIOCDEVPRIVATE: /* binary compat, remove in 2.5 */
- case SIOCGMIIPHY:
- mii_data->phy_id = mii_if->phy_id;
- /* fall through */
- case SIOCDEVPRIVATE + 1:/* binary compat, remove in 2.5 */
- case SIOCGMIIREG:
- mii_data->val_out =
- mii_if->mdio_read(mii_if->dev, mii_data->phy_id,
- mii_data->reg_num);
- break;
- case SIOCDEVPRIVATE + 2:/* binary compat, remove in 2.5 */
- case SIOCSMIIREG: {
- u16 val = mii_data->val_in;
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
- 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@mandrakesoft.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_sset);
- EXPORT_SYMBOL(mii_check_link);
- EXPORT_SYMBOL(mii_check_media);
- EXPORT_SYMBOL(generic_mii_ioctl);