drivers/net/phy/teranetics.c

   1 /*
   2  * Teranetics PHY drivers
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  *
   6  * Copyright 2010-2011 Freescale Semiconductor, Inc.
   7  * author Andy Fleming
   8  */
   9 #include <config.h>
  10 #include <common.h>
  11 #include <phy.h>
  12
  13 #ifndef CONFIG_PHYLIB_10G
  14 #error The Teranetics PHY needs 10G support
  15 #endif
  16
  17 int tn2020_config(struct phy_device *phydev)
  18 {
  19         if (phydev->port == PORT_FIBRE) {
  20                 unsigned short restart_an = (MDIO_AN_CTRL1_RESTART |
  21                                                 MDIO_AN_CTRL1_ENABLE |
  22                                                 MDIO_AN_CTRL1_XNP);
  23                 u8 phy_hwversion;
  24
  25                 /*
  26                  * bit 15:12 of register 30.32 indicates PHY hardware
  27                  * version. It can be used to distinguish TN80xx from
  28                  * TN2020. TN2020 needs write 0x2 to 30.93, but TN80xx
  29                  * needs 0x1.
  30                  */
  31                 phy_hwversion = (phy_read(phydev, 30, 32) >> 12) & 0xf;
  32                 if (phy_hwversion <= 3) {
  33                         phy_write(phydev, 30, 93, 2);
  34                         phy_write(phydev, MDIO_MMD_AN, MDIO_CTRL1, restart_an);
  35                 } else {
  36                         phy_write(phydev, 30, 93, 1);
  37                 }
  38         }
  39
  40         return 0;
  41 }
  42
  43 int tn2020_startup(struct phy_device *phydev)
  44 {
  45         unsigned int timeout = 5 * 1000; /* 5 second timeout */
  46
  47 #define MDIO_PHYXS_LANE_READY (MDIO_PHYXS_LNSTAT_SYNC0 | \
  48                                MDIO_PHYXS_LNSTAT_SYNC1 | \
  49                                MDIO_PHYXS_LNSTAT_SYNC2 | \
  50                                MDIO_PHYXS_LNSTAT_SYNC3 | \
  51                                MDIO_PHYXS_LNSTAT_ALIGN)
  52
  53         /*
  54          * Wait for the XAUI-SERDES lanes to align first.  Under normal
  55          * circumstances, this can take up to three seconds.
  56          */
  57         while (--timeout) {
  58                 int reg = phy_read(phydev, MDIO_MMD_PHYXS, MDIO_PHYXS_LNSTAT);
  59                 if (reg < 0) {
  60                         printf("TN2020: Error reading from PHY at "
  61                                "address %u\n", phydev->addr);
  62                         break;
  63                 }
  64                 if ((reg & MDIO_PHYXS_LANE_READY) == MDIO_PHYXS_LANE_READY)
  65                         break;
  66                 udelay(1000);
  67         }
  68         if (!timeout) {
  69                 /*
  70                  * A timeout is bad, but it may not be fatal, so don't
  71                  * return an error.  Display a warning instead.
  72                  */
  73                 printf("TN2020: Timeout waiting for PHY at address %u to "
  74                        "align.\n", phydev->addr);
  75         }
  76
  77         if (phydev->port != PORT_FIBRE)
  78                 return gen10g_startup(phydev);
  79
  80         /*
  81          * The TN2020 only pretends to support fiber.
  82          * It works, but it doesn't look like it works,
  83          * so the link status reports no link.
  84          */
  85         phydev->link = 1;
  86
  87         /* For now just lie and say it's 10G all the time */
  88         phydev->speed = SPEED_10000;
  89         phydev->duplex = DUPLEX_FULL;
  90
  91         return 0;
  92 }
  93
  94 struct phy_driver tn2020_driver = {
  95         .name = "Teranetics TN2020",
  96         .uid = PHY_UID_TN2020,
  97         .mask = 0xfffffff0,
  98         .features = PHY_10G_FEATURES,
  99         .mmds = (MDIO_DEVS_PMAPMD | MDIO_DEVS_PCS |
 100                         MDIO_DEVS_PHYXS | MDIO_DEVS_AN |
 101                         MDIO_DEVS_VEND1 | MDIO_DEVS_VEND2),
 102         .config = &tn2020_config,
 103         .startup = &tn2020_startup,
 104         .shutdown = &gen10g_shutdown,
 105 };
 106
 107 int phy_teranetics_init(void)
 108 {
 109         phy_register(&tn2020_driver);
 110
 111         return 0;
 112 }