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phylib: Add support for the LXT973 phy.
This patch implements a work around for Erratum 5, "3.3 V Fiber Speed Selection." If the hardware wiring does not respect this erratum, then fiber optic mode will not work properly. Signed-off-by: Richard Cochran <richard.cochran@omicron.at> Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 50 additions and 1 deletions
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@ -53,6 +53,9 @@
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#define MII_LXT971_ISR 19 /* Interrupt Status Register */
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/* register definitions for the 973 */
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#define MII_LXT973_PCR 16 /* Port Configuration Register */
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#define PCR_FIBER_SELECT 1
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MODULE_DESCRIPTION("Intel LXT PHY driver");
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MODULE_AUTHOR("Andy Fleming");
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@ -119,6 +122,33 @@ static int lxt971_config_intr(struct phy_device *phydev)
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return err;
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}
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static int lxt973_probe(struct phy_device *phydev)
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{
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int val = phy_read(phydev, MII_LXT973_PCR);
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if (val & PCR_FIBER_SELECT) {
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/*
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* If fiber is selected, then the only correct setting
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* is 100Mbps, full duplex, and auto negotiation off.
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*/
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val = phy_read(phydev, MII_BMCR);
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val |= (BMCR_SPEED100 | BMCR_FULLDPLX);
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val &= ~BMCR_ANENABLE;
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phy_write(phydev, MII_BMCR, val);
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/* Remember that the port is in fiber mode. */
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phydev->priv = lxt973_probe;
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} else {
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phydev->priv = NULL;
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}
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return 0;
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}
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static int lxt973_config_aneg(struct phy_device *phydev)
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{
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/* Do nothing if port is in fiber mode. */
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return phydev->priv ? 0 : genphy_config_aneg(phydev);
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}
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static struct phy_driver lxt970_driver = {
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.phy_id = 0x78100000,
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.name = "LXT970",
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@ -146,6 +176,18 @@ static struct phy_driver lxt971_driver = {
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.driver = { .owner = THIS_MODULE,},
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};
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static struct phy_driver lxt973_driver = {
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.phy_id = 0x00137a10,
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.name = "LXT973",
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.phy_id_mask = 0xfffffff0,
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.features = PHY_BASIC_FEATURES,
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.flags = 0,
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.probe = lxt973_probe,
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.config_aneg = lxt973_config_aneg,
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.read_status = genphy_read_status,
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.driver = { .owner = THIS_MODULE,},
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};
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static int __init lxt_init(void)
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{
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int ret;
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@ -157,9 +199,15 @@ static int __init lxt_init(void)
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ret = phy_driver_register(&lxt971_driver);
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if (ret)
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goto err2;
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ret = phy_driver_register(&lxt973_driver);
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if (ret)
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goto err3;
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return 0;
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err2:
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err3:
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phy_driver_unregister(&lxt971_driver);
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err2:
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phy_driver_unregister(&lxt970_driver);
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err1:
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return ret;
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@ -169,6 +217,7 @@ static void __exit lxt_exit(void)
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{
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phy_driver_unregister(&lxt970_driver);
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phy_driver_unregister(&lxt971_driver);
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phy_driver_unregister(&lxt973_driver);
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}
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module_init(lxt_init);
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