drivers/net/phy/teranetics.c

   1 /*
   2  * Driver for Teranetics PHY
   3  *
   4  * Author: Shaohui Xie <Shaohui.Xie@freescale.com>
   5  *
   6  * Copyright 2015 Freescale Semiconductor, Inc.
   7  *
   8  * This file is licensed under the terms of the GNU General Public License
   9  * version 2.  This program is licensed "as is" without any warranty of any
  10  * kind, whether express or implied.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/mii.h>
  16 #include <linux/ethtool.h>
  17 #include <linux/mdio.h>
  18 #include <linux/phy.h>
  19
  20 MODULE_DESCRIPTION("Teranetics PHY driver");
  21 MODULE_AUTHOR("Shaohui Xie <Shaohui.Xie@freescale.com>");
  22 MODULE_LICENSE("GPL v2");
  23
  24 #define PHY_ID_TN2020   0x00a19410
  25 #define MDIO_PHYXS_LNSTAT_SYNC0 0x0001
  26 #define MDIO_PHYXS_LNSTAT_SYNC1 0x0002
  27 #define MDIO_PHYXS_LNSTAT_SYNC2 0x0004
  28 #define MDIO_PHYXS_LNSTAT_SYNC3 0x0008
  29 #define MDIO_PHYXS_LNSTAT_ALIGN 0x1000
  30
  31 #define MDIO_PHYXS_LANE_READY   (MDIO_PHYXS_LNSTAT_SYNC0 | \
  32                                 MDIO_PHYXS_LNSTAT_SYNC1 | \
  33                                 MDIO_PHYXS_LNSTAT_SYNC2 | \
  34                                 MDIO_PHYXS_LNSTAT_SYNC3 | \
  35                                 MDIO_PHYXS_LNSTAT_ALIGN)
  36
  37 static int teranetics_config_init(struct phy_device *phydev)
  38 {
  39         phydev->supported = SUPPORTED_10000baseT_Full;
  40         phydev->advertising = SUPPORTED_10000baseT_Full;
  41
  42         return 0;
  43 }
  44
  45 static int teranetics_soft_reset(struct phy_device *phydev)
  46 {
  47         return 0;
  48 }
  49
  50 static int teranetics_aneg_done(struct phy_device *phydev)
  51 {
  52         int reg;
  53
  54         /* auto negotiation state can only be checked when using copper
  55          * port, if using fiber port, just lie it's done.
  56          */
  57         if (!phy_read_mmd(phydev, MDIO_MMD_VEND1, 93)) {
  58                 reg = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
  59                 return (reg < 0) ? reg : (reg & BMSR_ANEGCOMPLETE);
  60         }
  61
  62         return 1;
  63 }
  64
  65 static int teranetics_config_aneg(struct phy_device *phydev)
  66 {
  67         return 0;
  68 }
  69
  70 static int teranetics_read_status(struct phy_device *phydev)
  71 {
  72         int reg;
  73
  74         phydev->link = 1;
  75
  76         phydev->speed = SPEED_10000;
  77         phydev->duplex = DUPLEX_FULL;
  78
  79         if (!phy_read_mmd(phydev, MDIO_MMD_VEND1, 93)) {
  80                 reg = phy_read_mmd(phydev, MDIO_MMD_PHYXS, MDIO_PHYXS_LNSTAT);
  81                 if (reg < 0 ||
  82                     !((reg & MDIO_PHYXS_LANE_READY) == MDIO_PHYXS_LANE_READY)) {
  83                         phydev->link = 0;
  84                         return 0;
  85                 }
  86
  87                 reg = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
  88                 if (reg < 0 || !(reg & MDIO_STAT1_LSTATUS))
  89                         phydev->link = 0;
  90         }
  91
  92         return 0;
  93 }
  94
  95 static int teranetics_match_phy_device(struct phy_device *phydev)
  96 {
  97         return phydev->c45_ids.device_ids[3] == PHY_ID_TN2020;
  98 }
  99
 100 static struct phy_driver teranetics_driver[] = {
 101 {
 102         .phy_id         = PHY_ID_TN2020,
 103         .phy_id_mask    = 0xffffffff,
 104         .name           = "Teranetics TN2020",
 105         .soft_reset     = teranetics_soft_reset,
 106         .aneg_done      = teranetics_aneg_done,
 107         .config_init    = teranetics_config_init,
 108         .config_aneg    = teranetics_config_aneg,
 109         .read_status    = teranetics_read_status,
 110         .match_phy_device = teranetics_match_phy_device,
 111 },
 112 };
 113
 114 module_phy_driver(teranetics_driver);
 115
 116 static struct mdio_device_id __maybe_unused teranetics_tbl[] = {
 117         { PHY_ID_TN2020, 0xffffffff },
 118         { }
 119 };
 120
 121 MODULE_DEVICE_TABLE(mdio, teranetics_tbl);