powerpc/mpc5200: Refactor FEC mdio read/write routines

[pandora-kernel.git] / drivers / net / fec_mpc52xx_phy.c

diff --git a/drivers/net/fec_mpc52xx_phy.c b/drivers/net/fec_mpc52xx_phy.c
index 08e18bc..45dd9bd 100644 (file)
--- a/drivers/net/fec_mpc52xx_phy.c
+++ b/drivers/net/fec_mpc52xx_phy.c
@@ -2,6 +2,7 @@
  * Driver for the MPC5200 Fast Ethernet Controller - MDIO bus driver
  *
  * Copyright (C) 2007  Domen Puncer, Telargo, Inc.
+ * Copyright (C) 2008  Wolfram Sang, Pengutronix
  *
  * This file is licensed under the terms of the GNU General Public License
  * version 2. This program is licensed "as is" without any warranty of any
@@ -21,58 +22,45 @@ struct mpc52xx_fec_mdio_priv {
        struct mpc52xx_fec __iomem *regs;
 };
 
-static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
+static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
+               int reg, u32 value)
 {
        struct mpc52xx_fec_mdio_priv *priv = bus->priv;
        struct mpc52xx_fec __iomem *fec;
        int tries = 100;
-       u32 request = FEC_MII_READ_FRAME;
+
+       value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
+       value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
 
        fec = priv->regs;
        out_be32(&fec->ievent, FEC_IEVENT_MII);
-
-       request |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
-       request |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
-
-       out_be32(&priv->regs->mii_data, request);
+       out_be32(&priv->regs->mii_data, value);
 
        /* wait for it to finish, this takes about 23 us on lite5200b */
        while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
                udelay(5);
 
-       if (tries == 0)
+       if (!tries)
                return -ETIMEDOUT;
 
-       return in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK;
+       return value & FEC_MII_DATA_OP_RD ?
+               in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK : 0;
 }
 
-static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 data)
+static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
 {
-       struct mpc52xx_fec_mdio_priv *priv = bus->priv;
-       struct mpc52xx_fec __iomem *fec;
-       u32 value = data;
-       int tries = 100;
-
-       fec = priv->regs;
-       out_be32(&fec->ievent, FEC_IEVENT_MII);
-
-       value |= FEC_MII_WRITE_FRAME;
-       value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
-       value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
-
-       out_be32(&priv->regs->mii_data, value);
-
-       /* wait for request to finish */
-       while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
-               udelay(5);
-
-       if (tries == 0)
-               return -ETIMEDOUT;
+       return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);
+}
 
-       return 0;
+static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,
+               u16 data)
+{
+       return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,
+               data | FEC_MII_WRITE_FRAME);
 }
 
-static int mpc52xx_fec_mdio_probe(struct of_device *of, const struct of_device_id *match)
+static int mpc52xx_fec_mdio_probe(struct of_device *of,
+               const struct of_device_id *match)
 {
        struct device *dev = &of->dev;
        struct device_node *np = of->node;
@@ -131,7 +119,8 @@ static int mpc52xx_fec_mdio_probe(struct of_device *of, const struct of_device_i
        dev_set_drvdata(dev, bus);
 
        /* set MII speed */
-       out_be32(&priv->regs->mii_speed, ((mpc52xx_find_ipb_freq(of->node) >> 20) / 5) << 1);
+       out_be32(&priv->regs->mii_speed,
+               ((mpc52xx_find_ipb_freq(of->node) >> 20) / 5) << 1);
 
        /* enable MII interrupt */
        out_be32(&priv->regs->imask, in_be32(&priv->regs->imask) | FEC_IMASK_MII);