net: davinci_emac: switch to new mdio
Cyril Chemparathy [Wed, 15 Sep 2010 14:11:24 +0000 (10:11 -0400)]
This patch switches the emac implementation over to the newly separated
MDIO driver.

With this, the mdio bus frequency defaults to a safe 2.2MHz.  Boards may
optionally specify a bus frequency via platform data.

The phy identification scheme has been modified to use a phy bus id instead
of a mask.  This largely serves to eliminate the "phy search" code in emac
init.

Signed-off-by: Cyril Chemparathy <cyril@ti.com>
Acked-by: David S. Miller <davem@davemloft.net>
Tested-by: Michael Williamson <michael.williamson@criticallink.com>
Tested-by: Caglar Akyuz <caglarakyuz@gmail.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

drivers/net/Kconfig
drivers/net/davinci_emac.c
include/linux/davinci_emac.h

index c5c86e0..911e7f1 100644 (file)
@@ -951,6 +951,7 @@ config NET_NETX
 config TI_DAVINCI_EMAC
        tristate "TI DaVinci EMAC Support"
        depends on ARM && ( ARCH_DAVINCI || ARCH_OMAP3 )
+       select TI_DAVINCI_MDIO
        select PHYLIB
        help
          This driver supports TI's DaVinci Ethernet .
index 7fbd052..997f599 100644 (file)
@@ -500,6 +500,7 @@ struct emac_priv {
        u32 phy_mask;
        /* mii_bus,phy members */
        struct mii_bus *mii_bus;
+       const char *phy_id;
        struct phy_device *phydev;
        spinlock_t lock;
        /*platform specific members*/
@@ -686,7 +687,7 @@ static int emac_get_settings(struct net_device *ndev,
                             struct ethtool_cmd *ecmd)
 {
        struct emac_priv *priv = netdev_priv(ndev);
-       if (priv->phy_mask)
+       if (priv->phydev)
                return phy_ethtool_gset(priv->phydev, ecmd);
        else
                return -EOPNOTSUPP;
@@ -704,7 +705,7 @@ static int emac_get_settings(struct net_device *ndev,
 static int emac_set_settings(struct net_device *ndev, struct ethtool_cmd *ecmd)
 {
        struct emac_priv *priv = netdev_priv(ndev);
-       if (priv->phy_mask)
+       if (priv->phydev)
                return phy_ethtool_sset(priv->phydev, ecmd);
        else
                return -EOPNOTSUPP;
@@ -841,7 +842,7 @@ static void emac_update_phystatus(struct emac_priv *priv)
        mac_control = emac_read(EMAC_MACCONTROL);
        cur_duplex = (mac_control & EMAC_MACCONTROL_FULLDUPLEXEN) ?
                        DUPLEX_FULL : DUPLEX_HALF;
-       if (priv->phy_mask)
+       if (priv->phydev)
                new_duplex = priv->phydev->duplex;
        else
                new_duplex = DUPLEX_FULL;
@@ -2485,6 +2486,11 @@ static int emac_devioctl(struct net_device *ndev, struct ifreq *ifrq, int cmd)
        return -EOPNOTSUPP;
 }
 
+static int match_first_device(struct device *dev, void *data)
+{
+       return 1;
+}
+
 /**
  * emac_dev_open: EMAC device open
  * @ndev: The DaVinci EMAC network adapter
@@ -2499,7 +2505,6 @@ static int emac_dev_open(struct net_device *ndev)
 {
        struct device *emac_dev = &ndev->dev;
        u32 rc, cnt, ch;
-       int phy_addr;
        struct resource *res;
        int q, m;
        int i = 0;
@@ -2560,28 +2565,26 @@ static int emac_dev_open(struct net_device *ndev)
                emac_set_coalesce(ndev, &coal);
        }
 
-       /* find the first phy */
        priv->phydev = NULL;
-       if (priv->phy_mask) {
-               emac_mii_reset(priv->mii_bus);
-               for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
-                       if (priv->mii_bus->phy_map[phy_addr]) {
-                               priv->phydev = priv->mii_bus->phy_map[phy_addr];
-                               break;
-                       }
-               }
+       /* use the first phy on the bus if pdata did not give us a phy id */
+       if (!priv->phy_id) {
+               struct device *phy;
 
-               if (!priv->phydev) {
-                       printk(KERN_ERR "%s: no PHY found\n", ndev->name);
-                       return -1;
-               }
+               phy = bus_find_device(&mdio_bus_type, NULL, NULL,
+                                     match_first_device);
+               if (phy)
+                       priv->phy_id = dev_name(phy);
+       }
 
-               priv->phydev = phy_connect(ndev, dev_name(&priv->phydev->dev),
-                               &emac_adjust_link, 0, PHY_INTERFACE_MODE_MII);
+       if (priv->phy_id && *priv->phy_id) {
+               priv->phydev = phy_connect(ndev, priv->phy_id,
+                                          &emac_adjust_link, 0,
+                                          PHY_INTERFACE_MODE_MII);
 
                if (IS_ERR(priv->phydev)) {
-                       printk(KERN_ERR "%s: Could not attach to PHY\n",
-                                                               ndev->name);
+                       dev_err(emac_dev, "could not connect to phy %s\n",
+                               priv->phy_id);
+                       priv->phydev = NULL;
                        return PTR_ERR(priv->phydev);
                }
 
@@ -2589,12 +2592,13 @@ static int emac_dev_open(struct net_device *ndev)
                priv->speed = 0;
                priv->duplex = ~0;
 
-               printk(KERN_INFO "%s: attached PHY driver [%s] "
-                       "(mii_bus:phy_addr=%s, id=%x)\n", ndev->name,
+               dev_info(emac_dev, "attached PHY driver [%s] "
+                       "(mii_bus:phy_addr=%s, id=%x)\n",
                        priv->phydev->drv->name, dev_name(&priv->phydev->dev),
                        priv->phydev->phy_id);
-       } else{
+       } else {
                /* No PHY , fix the link, speed and duplex settings */
+               dev_notice(emac_dev, "no phy, defaulting to 100/full\n");
                priv->link = 1;
                priv->speed = SPEED_100;
                priv->duplex = DUPLEX_FULL;
@@ -2607,7 +2611,7 @@ static int emac_dev_open(struct net_device *ndev)
        if (netif_msg_drv(priv))
                dev_notice(emac_dev, "DaVinci EMAC: Opened %s\n", ndev->name);
 
-       if (priv->phy_mask)
+       if (priv->phydev)
                phy_start(priv->phydev);
 
        return 0;
@@ -2794,7 +2798,7 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev)
 
        /* MAC addr and PHY mask , RMII enable info from platform_data */
        memcpy(priv->mac_addr, pdata->mac_addr, 6);
-       priv->phy_mask = pdata->phy_mask;
+       priv->phy_id = pdata->phy_id;
        priv->rmii_en = pdata->rmii_en;
        priv->version = pdata->version;
        priv->int_enable = pdata->interrupt_enable;
@@ -2871,32 +2875,6 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev)
        }
 
 
-       /* MII/Phy intialisation, mdio bus registration */
-       emac_mii = mdiobus_alloc();
-       if (emac_mii == NULL) {
-               dev_err(emac_dev, "DaVinci EMAC: Error allocating mii_bus\n");
-               rc = -ENOMEM;
-               goto mdio_alloc_err;
-       }
-
-       priv->mii_bus = emac_mii;
-       emac_mii->name  = "emac-mii",
-       emac_mii->read  = emac_mii_read,
-       emac_mii->write = emac_mii_write,
-       emac_mii->reset = emac_mii_reset,
-       emac_mii->irq   = mii_irqs,
-       emac_mii->phy_mask = ~(priv->phy_mask);
-       emac_mii->parent = &pdev->dev;
-       emac_mii->priv = priv->remap_addr + pdata->mdio_reg_offset;
-       snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%x", priv->pdev->id);
-       mdio_max_freq = pdata->mdio_max_freq;
-       emac_mii->reset(emac_mii);
-
-       /* Register the MII bus */
-       rc = mdiobus_register(emac_mii);
-       if (rc)
-               goto mdiobus_quit;
-
        if (netif_msg_probe(priv)) {
                dev_notice(emac_dev, "DaVinci EMAC Probe found device "\
                           "(regs: %p, irq: %d)\n",
@@ -2904,11 +2882,7 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev)
        }
        return 0;
 
-mdiobus_quit:
-       mdiobus_free(emac_mii);
-
 netdev_reg_err:
-mdio_alloc_err:
        clk_disable(emac_clk);
 no_irq_res:
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -2938,8 +2912,6 @@ static int __devexit davinci_emac_remove(struct platform_device *pdev)
 
        platform_set_drvdata(pdev, NULL);
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-       mdiobus_unregister(priv->mii_bus);
-       mdiobus_free(priv->mii_bus);
 
        release_mem_region(res->start, res->end - res->start + 1);
 
index a04fd8c..46a759f 100644 (file)
@@ -28,6 +28,15 @@ struct emac_platform_data {
        u32 ctrl_ram_size;
        u32 phy_mask;
        u32 mdio_max_freq;
+
+       /*
+        * phy_id can be one of the following:
+        *   - NULL             : use the first phy on the bus,
+        *   - ""               : force to 100/full, no mdio control
+        *   - "<bus>:<addr>"   : use the specified bus and phy
+        */
+       const char *phy_id;
+
        u8 rmii_en;
        u8 version;
        void (*interrupt_enable) (void);