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authorMichal Simek <michal.simek@xilinx.com>2013-04-22 14:41:09 +0200
committerMichal Simek <michal.simek@xilinx.com>2013-04-30 11:39:26 +0200
commitf97d7e8be96888b622309d9563da0ab3fba0534b (patch)
tree47aca5d47ba074b15131d2bc119a99cae208902f
parent01fbf31042e1eba1fcca3e84f70db7de0d176fe4 (diff)
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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>
-rw-r--r--drivers/net/zynq_gem.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/net/zynq_gem.c b/drivers/net/zynq_gem.c
index 8e0e01c..eac9b6f 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);