arch/arm/cpu/arm926ejs/davinci/dp83848.c

   1 /*
   2  * National Semiconductor DP83848 PHY Driver for TI DaVinci
   3  * (TMS320DM644x) based boards.
   4  *
   5  * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
   6  *
   7  * --------------------------------------------------------
   8  *
   9  * SPDX-License-Identifier:     GPL-2.0+
  10  */
  11
  12 #include <common.h>
  13 #include <net.h>
  14 #include <dp83848.h>
  15 #include <asm/arch/emac_defs.h>
  16 #include "../../../../../drivers/net/davinci_emac.h"
  17
  18 #ifdef CONFIG_DRIVER_TI_EMAC
  19
  20 #ifdef CONFIG_CMD_NET
  21
  22 int dp83848_is_phy_connected(int phy_addr)
  23 {
  24         u_int16_t       id1, id2;
  25
  26         if (!davinci_eth_phy_read(phy_addr, DP83848_PHYID1_REG, &id1))
  27                 return(0);
  28         if (!davinci_eth_phy_read(phy_addr, DP83848_PHYID2_REG, &id2))
  29                 return(0);
  30
  31         if ((id1 == DP83848_PHYID1_OUI) && (id2 == DP83848_PHYID2_OUI))
  32                 return(1);
  33
  34         return(0);
  35 }
  36
  37 int dp83848_get_link_speed(int phy_addr)
  38 {
  39         u_int16_t               tmp;
  40         volatile emac_regs*     emac = (emac_regs *)EMAC_BASE_ADDR;
  41
  42         if (!davinci_eth_phy_read(phy_addr, DP83848_STAT_REG, &tmp))
  43                 return(0);
  44
  45         if (!(tmp & DP83848_LINK_STATUS))       /* link up? */
  46                 return(0);
  47
  48         if (!davinci_eth_phy_read(phy_addr, DP83848_PHY_STAT_REG, &tmp))
  49                 return(0);
  50
  51         /* Speed doesn't matter, there is no setting for it in EMAC... */
  52         if (tmp & DP83848_DUPLEX) {
  53                 /* set DM644x EMAC for Full Duplex  */
  54                 emac->MACCONTROL = EMAC_MACCONTROL_MIIEN_ENABLE |
  55                         EMAC_MACCONTROL_FULLDUPLEX_ENABLE;
  56         } else {
  57                 /*set DM644x EMAC for Half Duplex  */
  58                 emac->MACCONTROL = EMAC_MACCONTROL_MIIEN_ENABLE;
  59         }
  60
  61         return(1);
  62 }
  63
  64
  65 int dp83848_init_phy(int phy_addr)
  66 {
  67         int     ret = 1;
  68
  69         if (!dp83848_get_link_speed(phy_addr)) {
  70                 /* Try another time */
  71                 udelay(100000);
  72                 ret = dp83848_get_link_speed(phy_addr);
  73         }
  74
  75         /* Disable PHY Interrupts */
  76         davinci_eth_phy_write(phy_addr, DP83848_PHY_INTR_CTRL_REG, 0);
  77
  78         return(ret);
  79 }
  80
  81
  82 int dp83848_auto_negotiate(int phy_addr)
  83 {
  84         u_int16_t       tmp;
  85
  86
  87         if (!davinci_eth_phy_read(phy_addr, DP83848_CTL_REG, &tmp))
  88                 return(0);
  89
  90         /* Restart Auto_negotiation  */
  91         tmp &= ~DP83848_AUTONEG;        /* remove autonegotiation enable */
  92         tmp |= DP83848_ISOLATE;         /* Electrically isolate PHY */
  93         davinci_eth_phy_write(phy_addr, DP83848_CTL_REG, tmp);
  94
  95         /* Set the Auto_negotiation Advertisement Register
  96          * MII advertising for Next page, 100BaseTxFD and HD,
  97          * 10BaseTFD and HD, IEEE 802.3
  98          */
  99         tmp = DP83848_NP | DP83848_TX_FDX | DP83848_TX_HDX |
 100                 DP83848_10_FDX | DP83848_10_HDX | DP83848_AN_IEEE_802_3;
 101         davinci_eth_phy_write(phy_addr, DP83848_ANA_REG, tmp);
 102
 103
 104         /* Read Control Register */
 105         if (!davinci_eth_phy_read(phy_addr, DP83848_CTL_REG, &tmp))
 106                 return(0);
 107
 108         tmp |= DP83848_SPEED_SELECT | DP83848_AUTONEG | DP83848_DUPLEX_MODE;
 109         davinci_eth_phy_write(phy_addr, DP83848_CTL_REG, tmp);
 110
 111         /* Restart Auto_negotiation  */
 112         tmp |= DP83848_RESTART_AUTONEG;
 113         davinci_eth_phy_write(phy_addr, DP83848_CTL_REG, tmp);
 114
 115         /*check AutoNegotiate complete */
 116         udelay(10000);
 117         if (!davinci_eth_phy_read(phy_addr, DP83848_STAT_REG, &tmp))
 118                 return(0);
 119
 120         if (!(tmp & DP83848_AUTONEG_COMP))
 121                 return(0);
 122
 123         return (dp83848_get_link_speed(phy_addr));
 124 }
 125
 126 #endif  /* CONFIG_CMD_NET */
 127
 128 #endif  /* CONFIG_DRIVER_ETHER */