drivers/net/phy/broadcom.c

   1 /*
   2  * Broadcom 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 /* Broadcom BCM54xx -- taken from linux sungem_phy */
  14 #define MIIM_BCM54xx_AUXCNTL                    0x18
  15 #define MIIM_BCM54xx_AUXCNTL_ENCODE(val) (((val & 0x7) << 12)|(val & 0x7))
  16 #define MIIM_BCM54xx_AUXSTATUS                  0x19
  17 #define MIIM_BCM54xx_AUXSTATUS_LINKMODE_MASK    0x0700
  18 #define MIIM_BCM54xx_AUXSTATUS_LINKMODE_SHIFT   8
  19
  20 #define MIIM_BCM54XX_SHD                        0x1c
  21 #define MIIM_BCM54XX_SHD_WRITE                  0x8000
  22 #define MIIM_BCM54XX_SHD_VAL(x)                 ((x & 0x1f) << 10)
  23 #define MIIM_BCM54XX_SHD_DATA(x)                ((x & 0x3ff) << 0)
  24 #define MIIM_BCM54XX_SHD_WR_ENCODE(val, data)   \
  25         (MIIM_BCM54XX_SHD_WRITE | MIIM_BCM54XX_SHD_VAL(val) | \
  26          MIIM_BCM54XX_SHD_DATA(data))
  27
  28 #define MIIM_BCM54XX_EXP_DATA           0x15    /* Expansion register data */
  29 #define MIIM_BCM54XX_EXP_SEL            0x17    /* Expansion register select */
  30 #define MIIM_BCM54XX_EXP_SEL_SSD        0x0e00  /* Secondary SerDes select */
  31 #define MIIM_BCM54XX_EXP_SEL_ER         0x0f00  /* Expansion register select */
  32
  33 /* Broadcom BCM5461S */
  34 static int bcm5461_config(struct phy_device *phydev)
  35 {
  36         genphy_config_aneg(phydev);
  37
  38         phy_reset(phydev);
  39
  40         return 0;
  41 }
  42
  43 static int bcm54xx_parse_status(struct phy_device *phydev)
  44 {
  45         unsigned int mii_reg;
  46
  47         mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MIIM_BCM54xx_AUXSTATUS);
  48
  49         switch ((mii_reg & MIIM_BCM54xx_AUXSTATUS_LINKMODE_MASK) >>
  50                         MIIM_BCM54xx_AUXSTATUS_LINKMODE_SHIFT) {
  51         case 1:
  52                 phydev->duplex = DUPLEX_HALF;
  53                 phydev->speed = SPEED_10;
  54                 break;
  55         case 2:
  56                 phydev->duplex = DUPLEX_FULL;
  57                 phydev->speed = SPEED_10;
  58                 break;
  59         case 3:
  60                 phydev->duplex = DUPLEX_HALF;
  61                 phydev->speed = SPEED_100;
  62                 break;
  63         case 5:
  64                 phydev->duplex = DUPLEX_FULL;
  65                 phydev->speed = SPEED_100;
  66                 break;
  67         case 6:
  68                 phydev->duplex = DUPLEX_HALF;
  69                 phydev->speed = SPEED_1000;
  70                 break;
  71         case 7:
  72                 phydev->duplex = DUPLEX_FULL;
  73                 phydev->speed = SPEED_1000;
  74                 break;
  75         default:
  76                 printf("Auto-neg error, defaulting to 10BT/HD\n");
  77                 phydev->duplex = DUPLEX_HALF;
  78                 phydev->speed = SPEED_10;
  79                 break;
  80         }
  81
  82         return 0;
  83 }
  84
  85 static int bcm54xx_startup(struct phy_device *phydev)
  86 {
  87         /* Read the Status (2x to make sure link is right) */
  88         genphy_update_link(phydev);
  89         bcm54xx_parse_status(phydev);
  90
  91         return 0;
  92 }
  93
  94 /* Broadcom BCM5482S */
  95 /*
  96  * "Ethernet@Wirespeed" needs to be enabled to achieve link in certain
  97  * circumstances.  eg a gigabit TSEC connected to a gigabit switch with
  98  * a 4-wire ethernet cable.  Both ends advertise gigabit, but can't
  99  * link.  "Ethernet@Wirespeed" reduces advertised speed until link
 100  * can be achieved.
 101  */
 102 static u32 bcm5482_read_wirespeed(struct phy_device *phydev, u32 reg)
 103 {
 104         return (phy_read(phydev, MDIO_DEVAD_NONE, reg) & 0x8FFF) | 0x8010;
 105 }
 106
 107 static int bcm5482_config(struct phy_device *phydev)
 108 {
 109         unsigned int reg;
 110
 111         /* reset the PHY */
 112         reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
 113         reg |= BMCR_RESET;
 114         phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, reg);
 115
 116         /* Setup read from auxilary control shadow register 7 */
 117         phy_write(phydev, MDIO_DEVAD_NONE, MIIM_BCM54xx_AUXCNTL,
 118                         MIIM_BCM54xx_AUXCNTL_ENCODE(7));
 119         /* Read Misc Control register and or in Ethernet@Wirespeed */
 120         reg = bcm5482_read_wirespeed(phydev, MIIM_BCM54xx_AUXCNTL);
 121         phy_write(phydev, MDIO_DEVAD_NONE, MIIM_BCM54xx_AUXCNTL, reg);
 122
 123         /* Initial config/enable of secondary SerDes interface */
 124         phy_write(phydev, MDIO_DEVAD_NONE, MIIM_BCM54XX_SHD,
 125                         MIIM_BCM54XX_SHD_WR_ENCODE(0x14, 0xf));
 126         /* Write intial value to secondary SerDes Contol */
 127         phy_write(phydev, MDIO_DEVAD_NONE, MIIM_BCM54XX_EXP_SEL,
 128                         MIIM_BCM54XX_EXP_SEL_SSD | 0);
 129         phy_write(phydev, MDIO_DEVAD_NONE, MIIM_BCM54XX_EXP_DATA,
 130                         BMCR_ANRESTART);
 131         /* Enable copper/fiber auto-detect */
 132         phy_write(phydev, MDIO_DEVAD_NONE, MIIM_BCM54XX_SHD,
 133                         MIIM_BCM54XX_SHD_WR_ENCODE(0x1e, 0x201));
 134
 135         genphy_config_aneg(phydev);
 136
 137         return 0;
 138 }
 139
 140 /*
 141  * Find out if PHY is in copper or serdes mode by looking at Expansion Reg
 142  * 0x42 - "Operating Mode Status Register"
 143  */
 144 static int bcm5482_is_serdes(struct phy_device *phydev)
 145 {
 146         u16 val;
 147         int serdes = 0;
 148
 149         phy_write(phydev, MDIO_DEVAD_NONE, MIIM_BCM54XX_EXP_SEL,
 150                         MIIM_BCM54XX_EXP_SEL_ER | 0x42);
 151         val = phy_read(phydev, MDIO_DEVAD_NONE, MIIM_BCM54XX_EXP_DATA);
 152
 153         switch (val & 0x1f) {
 154         case 0x0d:      /* RGMII-to-100Base-FX */
 155         case 0x0e:      /* RGMII-to-SGMII */
 156         case 0x0f:      /* RGMII-to-SerDes */
 157         case 0x12:      /* SGMII-to-SerDes */
 158         case 0x13:      /* SGMII-to-100Base-FX */
 159         case 0x16:      /* SerDes-to-Serdes */
 160                 serdes = 1;
 161                 break;
 162         case 0x6:       /* RGMII-to-Copper */
 163         case 0x14:      /* SGMII-to-Copper */
 164         case 0x17:      /* SerDes-to-Copper */
 165                 break;
 166         default:
 167                 printf("ERROR, invalid PHY mode (0x%x\n)", val);
 168                 break;
 169         }
 170
 171         return serdes;
 172 }
 173
 174 /*
 175  * Determine SerDes link speed and duplex from Expansion reg 0x42 "Operating
 176  * Mode Status Register"
 177  */
 178 static u32 bcm5482_parse_serdes_sr(struct phy_device *phydev)
 179 {
 180         u16 val;
 181         int i = 0;
 182
 183         /* Wait 1s for link - Clause 37 autonegotiation happens very fast */
 184         while (1) {
 185                 phy_write(phydev, MDIO_DEVAD_NONE, MIIM_BCM54XX_EXP_SEL,
 186                                 MIIM_BCM54XX_EXP_SEL_ER | 0x42);
 187                 val = phy_read(phydev, MDIO_DEVAD_NONE, MIIM_BCM54XX_EXP_DATA);
 188
 189                 if (val & 0x8000)
 190                         break;
 191
 192                 if (i++ > 1000) {
 193                         phydev->link = 0;
 194                         return 1;
 195                 }
 196
 197                 udelay(1000);   /* 1 ms */
 198         }
 199
 200         phydev->link = 1;
 201         switch ((val >> 13) & 0x3) {
 202         case (0x00):
 203                 phydev->speed = 10;
 204                 break;
 205         case (0x01):
 206                 phydev->speed = 100;
 207                 break;
 208         case (0x02):
 209                 phydev->speed = 1000;
 210                 break;
 211         }
 212
 213         phydev->duplex = (val & 0x1000) == 0x1000;
 214
 215         return 0;
 216 }
 217
 218 /*
 219  * Figure out if BCM5482 is in serdes or copper mode and determine link
 220  * configuration accordingly
 221  */
 222 static int bcm5482_startup(struct phy_device *phydev)
 223 {
 224         if (bcm5482_is_serdes(phydev)) {
 225                 bcm5482_parse_serdes_sr(phydev);
 226                 phydev->port = PORT_FIBRE;
 227         } else {
 228                 /* Wait for auto-negotiation to complete or fail */
 229                 genphy_update_link(phydev);
 230                 /* Parse BCM54xx copper aux status register */
 231                 bcm54xx_parse_status(phydev);
 232         }
 233
 234         return 0;
 235 }
 236
 237 static struct phy_driver BCM5461S_driver = {
 238         .name = "Broadcom BCM5461S",
 239         .uid = 0x2060c0,
 240         .mask = 0xfffff0,
 241         .features = PHY_GBIT_FEATURES,
 242         .config = &bcm5461_config,
 243         .startup = &bcm54xx_startup,
 244         .shutdown = &genphy_shutdown,
 245 };
 246
 247 static struct phy_driver BCM5464S_driver = {
 248         .name = "Broadcom BCM5464S",
 249         .uid = 0x2060b0,
 250         .mask = 0xfffff0,
 251         .features = PHY_GBIT_FEATURES,
 252         .config = &bcm5461_config,
 253         .startup = &bcm54xx_startup,
 254         .shutdown = &genphy_shutdown,
 255 };
 256
 257 static struct phy_driver BCM5482S_driver = {
 258         .name = "Broadcom BCM5482S",
 259         .uid = 0x143bcb0,
 260         .mask = 0xffffff0,
 261         .features = PHY_GBIT_FEATURES,
 262         .config = &bcm5482_config,
 263         .startup = &bcm5482_startup,
 264         .shutdown = &genphy_shutdown,
 265 };
 266
 267 int phy_broadcom_init(void)
 268 {
 269         phy_register(&BCM5482S_driver);
 270         phy_register(&BCM5464S_driver);
 271         phy_register(&BCM5461S_driver);
 272
 273         return 0;
 274 }