ramips: add MDIO bus support for RT288X

SVN-Revision: 30455

diff --git a/target/linux/ramips/files/drivers/net/ramips.c b/target/linux/ramips/files/drivers/net/ramips.c
index 5d9d9f3b483582a1cceba3e333fec08911041be7..302942a62018e9c37cd5b7d39b6a527945b3c391 100644 (file)
--- a/target/linux/ramips/files/drivers/net/ramips.c
+++ b/target/linux/ramips/files/drivers/net/ramips.c
@@ -24,6 +24,7 @@
 #include <linux/etherdevice.h>
 #include <linux/ethtool.h>
 #include <linux/platform_device.h>
+#include <linux/phy.h>
 
 #include <ramips_eth_platform.h>
 #include "ramips_eth.h"
@@ -88,6 +89,9 @@ ramips_hw_set_macaddr(unsigned char *mac)
 }
 
 #ifdef CONFIG_RALINK_RT288X
+
+#define RAMIPS_MDIO_RETRY      1000
+
 static void
 ramips_setup_mdio_cfg(struct raeth_priv *re)
 {
@@ -122,8 +126,140 @@ ramips_setup_mdio_cfg(struct raeth_priv *re)
 
        ramips_fe_wr(mdio_cfg, RAMIPS_MDIO_CFG);
 }
+static int
+ramips_mdio_wait_ready(struct raeth_priv *re)
+{
+       int retries;
+
+       retries = RAMIPS_MDIO_RETRY;
+       while (1) {
+               u32 t;
+
+               t = ramips_fe_rr(RAMIPS_MDIO_ACCESS);
+               if ((t & (0x1 << 31)) == 0)
+                       return 0;
+
+               if (retries-- == 0)
+                       break;
+
+               udelay(1);
+       }
+
+       dev_err(re->parent, "MDIO operation timed out\n");
+       return -ETIMEDOUT;
+}
+
+static int
+ramips_mdio_read(struct mii_bus *bus, int phy_addr, int phy_reg)
+{
+       struct raeth_priv *re = bus->priv;
+       int err;
+       u32 t;
+
+       err = ramips_mdio_wait_ready(re);
+       if (err)
+               return 0xffff;
+
+       t = (phy_addr << 24) | (phy_reg << 16);
+       ramips_fe_wr(t, RAMIPS_MDIO_ACCESS);
+       t |= (1 << 31);
+       ramips_fe_wr(t, RAMIPS_MDIO_ACCESS);
+
+       err = ramips_mdio_wait_ready(re);
+       if (err)
+               return 0xffff;
+
+       RADEBUG("%s: addr=%04x, reg=%04x, value=%04x\n", __func__,
+               phy_addr, phy_reg, ramips_fe_rr(RAMIPS_MDIO_ACCESS) & 0xffff);
+
+       return ramips_fe_rr(RAMIPS_MDIO_ACCESS) & 0xffff;
+}
+
+static int
+ramips_mdio_write(struct mii_bus *bus, int phy_addr, int phy_reg, u16 val)
+{
+       struct raeth_priv *re = bus->priv;
+       int err;
+       u32 t;
+
+       RADEBUG("%s: addr=%04x, reg=%04x, value=%04x\n", __func__,
+               phy_addr, phy_reg, ramips_fe_rr(RAMIPS_MDIO_ACCESS) & 0xffff);
+
+       err = ramips_mdio_wait_ready(re);
+       if (err)
+               return err;
+
+       t = (1 << 30) | (phy_addr << 24) | (phy_reg << 16) | val;
+       ramips_fe_wr(t, RAMIPS_MDIO_ACCESS);
+       t |= (1 << 31);
+       ramips_fe_wr(t, RAMIPS_MDIO_ACCESS);
+
+       return ramips_mdio_wait_ready(re);
+}
+
+static int
+ramips_mdio_reset(struct mii_bus *bus)
+{
+       /* TODO */
+       return 0;
+}
+
+static int
+ramips_mdio_init(struct raeth_priv *re)
+{
+       int err;
+       int i;
+
+       re->mii_bus = mdiobus_alloc();
+       if (re->mii_bus == NULL)
+               return -ENOMEM;
+
+       re->mii_bus->name = "ramips_mdio";
+       re->mii_bus->read = ramips_mdio_read;
+       re->mii_bus->write = ramips_mdio_write;
+       re->mii_bus->reset = ramips_mdio_reset;
+       re->mii_bus->irq = re->mii_irq;
+       re->mii_bus->priv = re;
+       re->mii_bus->parent = re->parent;
+
+       snprintf(re->mii_bus->id, MII_BUS_ID_SIZE, "%s", "ramips_mdio");
+       re->mii_bus->phy_mask = 0;
+
+       for (i = 0; i < PHY_MAX_ADDR; i++)
+               re->mii_irq[i] = PHY_POLL;
+
+       err = mdiobus_register(re->mii_bus);
+       if (err)
+               goto err_free_bus;
+
+       return 0;
+
+err_free_bus:
+       kfree(re->mii_bus);
+       return err;
+}
+
+static void
+ramips_mdio_cleanup(struct raeth_priv *re)
+{
+       mdiobus_unregister(re->mii_bus);
+       kfree(re->mii_bus);
+}
+
 #else
-static inline void ramips_setup_mdio_cfg(struct raeth_priv *re)
+static inline void
+ramips_setup_mdio_cfg(struct raeth_priv *re)
+{
+}
+
+static inline int
+ramips_mdio_init(struct raeth_priv *re)
+{
+       return 0;
+}
+
+static inline void
+ramips_mdio_cleanup(struct raeth_priv *re)
 {
 }
 #endif /* CONFIG_RALINK_RT288X */
@@ -457,6 +593,7 @@ static int __init
 ramips_eth_probe(struct net_device *dev)
 {
        struct raeth_priv *priv = netdev_priv(dev);
+       int err;
 
        BUG_ON(!priv->plat->reset_fe);
        priv->plat->reset_fe();
@@ -468,11 +605,21 @@ ramips_eth_probe(struct net_device *dev)
        dev->watchdog_timeo = TX_TIMEOUT;
        spin_lock_init(&priv->page_lock);
 
-       return 0;
+       err = ramips_mdio_init(priv);
+       return err;
+}
+
+static void
+ramips_eth_uninit(struct net_device *dev)
+{
+       struct raeth_priv *re = netdev_priv(dev);
+
+       ramips_mdio_cleanup(re);
 }
 
 static const struct net_device_ops ramips_eth_netdev_ops = {
        .ndo_init               = ramips_eth_probe,
+       .ndo_uninit             = ramips_eth_uninit,
        .ndo_open               = ramips_eth_open,
        .ndo_stop               = ramips_eth_stop,
        .ndo_start_xmit         = ramips_eth_hard_start_xmit,
@@ -526,6 +673,7 @@ ramips_eth_plat_probe(struct platform_device *plat)
        priv = netdev_priv(ramips_dev);
 
        priv->netdev = ramips_dev;
+       priv->parent = &plat->dev;
        priv->speed = data->speed;
        priv->duplex = data->duplex;
        priv->rx_fc = data->rx_fc;

diff --git a/target/linux/ramips/files/drivers/net/ramips_eth.h b/target/linux/ramips/files/drivers/net/ramips_eth.h
index 87e67a581e7001983b6806dc302ce2ed3989c7e6..4927f2a211d3eea5ff7446ba2b4addd02b0aeb7c 100644 (file)
--- a/target/linux/ramips/files/drivers/net/ramips_eth.h
+++ b/target/linux/ramips/files/drivers/net/ramips_eth.h
@@ -230,12 +230,16 @@ struct raeth_priv
 
        spinlock_t              page_lock;
        struct net_device       *netdev;
+       struct device           *parent;
        struct ramips_eth_platform_data *plat;
 
        int                     speed;
        int                     duplex;
        int                     tx_fc;
        int                     rx_fc;
+
+       struct mii_bus          *mii_bus;
+       int                     mii_irq[PHY_MAX_ADDR];
 };
 
 #endif /* RAMIPS_ETH_H */