drivers/net/phy/realtek.c

   1 /*
   2  * RealTek 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 #define PHY_AUTONEGOTIATE_TIMEOUT 5000
  14
  15 /* RTL8211B PHY Status Register */
  16 #define MIIM_RTL8211B_PHY_STATUS       0x11
  17 #define MIIM_RTL8211B_PHYSTAT_SPEED    0xc000
  18 #define MIIM_RTL8211B_PHYSTAT_GBIT     0x8000
  19 #define MIIM_RTL8211B_PHYSTAT_100      0x4000
  20 #define MIIM_RTL8211B_PHYSTAT_DUPLEX   0x2000
  21 #define MIIM_RTL8211B_PHYSTAT_SPDDONE  0x0800
  22 #define MIIM_RTL8211B_PHYSTAT_LINK     0x0400
  23
  24
  25 /* RealTek RTL8211B */
  26 static int rtl8211b_config(struct phy_device *phydev)
  27 {
  28         phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, BMCR_RESET);
  29
  30         genphy_config_aneg(phydev);
  31
  32         return 0;
  33 }
  34
  35 static int rtl8211b_parse_status(struct phy_device *phydev)
  36 {
  37         unsigned int speed;
  38         unsigned int mii_reg;
  39
  40         mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MIIM_RTL8211B_PHY_STATUS);
  41
  42         if (!(mii_reg & MIIM_RTL8211B_PHYSTAT_SPDDONE)) {
  43                 int i = 0;
  44
  45                 /* in case of timeout ->link is cleared */
  46                 phydev->link = 1;
  47                 puts("Waiting for PHY realtime link");
  48                 while (!(mii_reg & MIIM_RTL8211B_PHYSTAT_SPDDONE)) {
  49                         /* Timeout reached ? */
  50                         if (i > PHY_AUTONEGOTIATE_TIMEOUT) {
  51                                 puts(" TIMEOUT !\n");
  52                                 phydev->link = 0;
  53                                 break;
  54                         }
  55
  56                         if ((i++ % 1000) == 0)
  57                                 putc('.');
  58                         udelay(1000);   /* 1 ms */
  59                         mii_reg = phy_read(phydev, MDIO_DEVAD_NONE,
  60                                         MIIM_RTL8211B_PHY_STATUS);
  61                 }
  62                 puts(" done\n");
  63                 udelay(500000); /* another 500 ms (results in faster booting) */
  64         } else {
  65                 if (mii_reg & MIIM_RTL8211B_PHYSTAT_LINK)
  66                         phydev->link = 1;
  67                 else
  68                         phydev->link = 0;
  69         }
  70
  71         if (mii_reg & MIIM_RTL8211B_PHYSTAT_DUPLEX)
  72                 phydev->duplex = DUPLEX_FULL;
  73         else
  74                 phydev->duplex = DUPLEX_HALF;
  75
  76         speed = (mii_reg & MIIM_RTL8211B_PHYSTAT_SPEED);
  77
  78         switch (speed) {
  79         case MIIM_RTL8211B_PHYSTAT_GBIT:
  80                 phydev->speed = SPEED_1000;
  81                 break;
  82         case MIIM_RTL8211B_PHYSTAT_100:
  83                 phydev->speed = SPEED_100;
  84                 break;
  85         default:
  86                 phydev->speed = SPEED_10;
  87         }
  88
  89         return 0;
  90 }
  91
  92 static int rtl8211b_startup(struct phy_device *phydev)
  93 {
  94         /* Read the Status (2x to make sure link is right) */
  95         genphy_update_link(phydev);
  96         rtl8211b_parse_status(phydev);
  97
  98         return 0;
  99 }
 100
 101 static struct phy_driver RTL8211B_driver = {
 102         .name = "RealTek RTL8211B",
 103         .uid = 0x1cc910,
 104         .mask = 0xfffff0,
 105         .features = PHY_GBIT_FEATURES,
 106         .config = &rtl8211b_config,
 107         .startup = &rtl8211b_startup,
 108         .shutdown = &genphy_shutdown,
 109 };
 110
 111 int phy_realtek_init(void)
 112 {
 113         phy_register(&RTL8211B_driver);
 114
 115         return 0;
 116 }