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net: gem: Add support for phy autodetection 

Autodetect phy if phyaddress is setup to -1.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Tom Rini <trini@ti.com>
This commit is contained in:
Michal Simek 2013-04-22 14:41:09 +02:00
parent 01fbf31042
commit f97d7e8be9
1 changed files with 51 additions and 0 deletions
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51
drivers/net/zynq_gem.c
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@ -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);