diff options
Diffstat (limited to 'drivers/net/zynq_gem.c')
| -rw-r--r-- | drivers/net/zynq_gem.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/net/zynq_gem.c b/drivers/net/zynq_gem.c index 8e0e01ce8..eac9b6f45 100644 --- a/drivers/net/zynq_gem.c +++ b/drivers/net/zynq_gem.c @@ -95,6 +95,17 @@ ZYNQ_GEM_DMACR_TXSIZE | \ ZYNQ_GEM_DMACR_RXBUF) +/* Use MII register 1 (MII status register) to detect PHY */ +#define PHY_DETECT_REG 1 + +/* Mask used to verify certain PHY features (or register contents) + * in the register above: + * 0x1000: 10Mbps full duplex support + * 0x0800: 10Mbps half duplex support + * 0x0008: Auto-negotiation support + */ +#define PHY_DETECT_MASK 0x1808 + /* Device registers */ struct zynq_gem_regs { u32 nwctrl; /* Network Control reg */ @@ -201,6 +212,44 @@ static u32 phywrite(struct eth_device *dev, u32 phy_addr, u32 regnum, u16 data) ZYNQ_GEM_PHYMNTNC_OP_W_MASK, &data); } +static void phy_detection(struct eth_device *dev) +{ + int i; + u16 phyreg; + struct zynq_gem_priv *priv = dev->priv; + + if (priv->phyaddr != -1) { + phyread(dev, priv->phyaddr, PHY_DETECT_REG, &phyreg); + if ((phyreg != 0xFFFF) && + ((phyreg & PHY_DETECT_MASK) == PHY_DETECT_MASK)) { + /* Found a valid PHY address */ + debug("Default phy address %d is valid\n", + priv->phyaddr); + return; + } else { + debug("PHY address is not setup correctly %d\n", + priv->phyaddr); + priv->phyaddr = -1; + } + } + + debug("detecting phy address\n"); + if (priv->phyaddr == -1) { + /* detect the PHY address */ + for (i = 31; i >= 0; i--) { + phyread(dev, i, PHY_DETECT_REG, &phyreg); + if ((phyreg != 0xFFFF) && + ((phyreg & PHY_DETECT_MASK) == PHY_DETECT_MASK)) { + /* Found a valid PHY address */ + priv->phyaddr = i; + debug("Found valid phy address, %d\n", i); + return; + } + } + } + printf("PHY is not detected\n"); +} + static int zynq_gem_setup_mac(struct eth_device *dev) { u32 i, macaddrlow, macaddrhigh; @@ -290,6 +339,8 @@ static int zynq_gem_init(struct eth_device *dev, bd_t * bis) priv->init++; } + phy_detection(dev); + /* interface - look at tsec */ phydev = phy_connect(priv->bus, priv->phyaddr, dev, 0); |