drivers/net/phy/teranetics.c

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