Fixed MTP to work with TWRP

drivers/net/mii.c

@@ -0,0 +1,472 @@
+/*
+
+	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_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_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 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;
+
+	/* 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)
+			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);
+
+	/* 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;
+		/* fall through */
+
+	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_sset);
+EXPORT_SYMBOL(mii_check_link);
+EXPORT_SYMBOL(mii_check_media);
+EXPORT_SYMBOL(mii_check_gmii_support);
+EXPORT_SYMBOL(generic_mii_ioctl);
+