[PATCH] mv643xx_eth: use MII library for PHY management

Modify link up/down handling to use the functions from the MII
library.  Note that I track link state using the MII PHY registers
rather than the mv643xx chip's link state registers because I think
it's cleaner to use the MII library code rather than writing local
driver support code. It is also useful to make the actual MII
registers available to the user with maskable kernel printk messages
so the MII registers are being read anyway

Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: Dale Farnsworth <dale@farnsworth.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

drivers/net/mv643xx_eth.c

@@ -79,7 +79,6 @@
 #define PHY_WAIT_MICRO_SECONDS	10
 
 /* Static function declarations */
-static int eth_port_link_is_up(unsigned int eth_port_num);
 static void eth_port_uc_addr_get(struct net_device *dev,
 						unsigned char *MacAddr);
 static void eth_port_set_multicast_list(struct net_device *);
@@ -97,8 +96,11 @@ static void eth_port_init_mac_tables(unsigned int eth_port_num);
 #ifdef MV643XX_NAPI
 static int mv643xx_poll(struct net_device *dev, int *budget);
 #endif
+static int ethernet_phy_get(unsigned int eth_port_num);
 static void ethernet_phy_set(unsigned int eth_port_num, int phy_addr);
 static int ethernet_phy_detect(unsigned int eth_port_num);
+static int mv643xx_mdio_read(struct net_device *dev, int phy_id, int location);
+static void mv643xx_mdio_write(struct net_device *dev, int phy_id, int location, int val);
 static struct ethtool_ops mv643xx_ethtool_ops;
 
 static char mv643xx_driver_name[] = "mv643xx_eth";
@@ -537,14 +539,17 @@ static irqreturn_t mv643xx_eth_int_handler(int irq, void *dev_id,
 	}
 	/* PHY status changed */
 	if (eth_int_cause_ext & (BIT16 | BIT20)) {
-		if (eth_port_link_is_up(port_num)) {
-			netif_carrier_on(dev);
-			netif_wake_queue(dev);
-			/* Start TX queue */
-			mv643xx_eth_port_enable_tx(port_num, mp->port_tx_queue_command);
-		} else {
-			netif_carrier_off(dev);
+		if (mii_link_ok(&mp->mii)) {
+			if (!netif_carrier_ok(dev)) {
+				netif_carrier_on(dev);
+				netif_wake_queue(dev);
+				/* Start TX queue */
+				mv643xx_eth_port_enable_tx(port_num,
+						mp->port_tx_queue_command);
+			}
+		} else if (netif_carrier_ok(dev)) {
 			netif_stop_queue(dev);
+			netif_carrier_off(dev);
 		}
 	}
 
@@ -1434,6 +1439,14 @@ static int mv643xx_eth_probe(struct platform_device *pdev)
 		}
 	}
 
+	/* Hook up MII support for ethtool */
+	mp->mii.dev = dev;
+	mp->mii.mdio_read = mv643xx_mdio_read;
+	mp->mii.mdio_write = mv643xx_mdio_write;
+	mp->mii.phy_id = ethernet_phy_get(port_num);
+	mp->mii.phy_id_mask = 0x3f;
+	mp->mii.reg_num_mask = 0x1f;
+
 	err = ethernet_phy_detect(port_num);
 	if (err) {
 		pr_debug("MV643xx ethernet port %d: "
@@ -1442,6 +1455,8 @@ static int mv643xx_eth_probe(struct platform_device *pdev)
 		return err;
 	}
 
+	mp->mii.supports_gmii = mii_check_gmii_support(&mp->mii);
+
 	err = register_netdev(dev);
 	if (err)
 		goto out;
@@ -2416,21 +2431,6 @@ static int eth_port_autoneg_supported(unsigned int eth_port_num)
 	return phy_reg_data0 & 0x1000;
 }
 
-static int eth_port_link_is_up(unsigned int eth_port_num)
-{
-	unsigned int phy_reg_data1;
-
-	eth_port_read_smi_reg(eth_port_num, 1, &phy_reg_data1);
-
-	if (eth_port_autoneg_supported(eth_port_num)) {
-		if (phy_reg_data1 & 0x20)	/* auto-neg complete */
-			return 1;
-	} else if (phy_reg_data1 & 0x4)		/* link up */
-		return 1;
-
-	return 0;
-}
-
 /*
  * eth_port_read_smi_reg - Read PHY registers
  *
@@ -2535,6 +2535,24 @@ static void eth_port_write_smi_reg(unsigned int eth_port_num,
 	spin_unlock_irqrestore(&mv643xx_eth_phy_lock, flags);
 }
 
+/*
+ * Wrappers for MII support library.
+ */
+static int mv643xx_mdio_read(struct net_device *dev, int phy_id, int location)
+{
+	int val;
+	struct mv643xx_private *mp = netdev_priv(dev);
+
+	eth_port_read_smi_reg(mp->port_num, location, &val);
+	return val;
+}
+
+static void mv643xx_mdio_write(struct net_device *dev, int phy_id, int location, int val)
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+	eth_port_write_smi_reg(mp->port_num, location, val);
+}
+
 /*
  * eth_port_send - Send an Ethernet packet
  *

drivers/net/mv643xx_eth.h

@@ -5,6 +5,7 @@
 #include <linux/kernel.h>
 #include <linux/spinlock.h>
 #include <linux/workqueue.h>
+#include <linux/mii.h>
 
 #include <linux/mv643xx.h>
 
@@ -393,6 +394,7 @@ struct mv643xx_private {
 
 	u32 rx_int_coal;
 	u32 tx_int_coal;
+	struct mii_if_info mii;
 };
 
 /* ethernet.h API list */