LXR linux/drivers/net/ethernet/freescale/fec_mpc52xx

   1/*
   2 * Driver for the MPC5200 Fast Ethernet Controller - MDIO bus driver
   3 *
   4 * Copyright (C) 2007  Domen Puncer, Telargo, Inc.
   5 * Copyright (C) 2008  Wolfram Sang, Pengutronix
   6 *
   7 * This file is licensed under the terms of the GNU General Public License
   8 * version 2. This program is licensed "as is" without any warranty of any
   9 * kind, whether express or implied.
  10 */
  11
  12#include <linux/kernel.h>
  13#include <linux/module.h>
  14#include <linux/netdevice.h>
  15#include <linux/phy.h>
  16#include <linux/of_platform.h>
  17#include <linux/slab.h>
  18#include <linux/of_mdio.h>
  19#include <asm/io.h>
  20#include <asm/mpc52xx.h>
  21#include "fec_mpc52xx.h"
  22
  23struct mpc52xx_fec_mdio_priv {
  24        struct mpc52xx_fec __iomem *regs;
  25};
  26
  27static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
  28                int reg, u32 value)
  29{
  30        struct mpc52xx_fec_mdio_priv *priv = bus->priv;
  31        struct mpc52xx_fec __iomem *fec = priv->regs;
  32        int tries = 3;
  33
  34        value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
  35        value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
  36
  37        out_be32(&fec->ievent, FEC_IEVENT_MII);
  38        out_be32(&fec->mii_data, value);
  39
  40        /* wait for it to finish, this takes about 23 us on lite5200b */
  41        while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
  42                msleep(1);
  43
  44        if (!tries)
  45                return -ETIMEDOUT;
  46
  47        return value & FEC_MII_DATA_OP_RD ?
  48                in_be32(&fec->mii_data) & FEC_MII_DATA_DATAMSK : 0;
  49}
  50
  51static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
  52{
  53        return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);
  54}
  55
  56static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,
  57                u16 data)
  58{
  59        return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,
  60                data | FEC_MII_WRITE_FRAME);
  61}
  62
  63static int mpc52xx_fec_mdio_probe(struct platform_device *of)
  64{
  65        struct device *dev = &of->dev;
  66        struct device_node *np = of->dev.of_node;
  67        struct mii_bus *bus;
  68        struct mpc52xx_fec_mdio_priv *priv;
  69        struct resource res;
  70        int err;
  71
  72        bus = mdiobus_alloc();
  73        if (bus == NULL)
  74                return -ENOMEM;
  75        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
  76        if (priv == NULL) {
  77                err = -ENOMEM;
  78                goto out_free;
  79        }
  80
  81        bus->name = "mpc52xx MII bus";
  82        bus->read = mpc52xx_fec_mdio_read;
  83        bus->write = mpc52xx_fec_mdio_write;
  84
  85        /* setup registers */
  86        err = of_address_to_resource(np, 0, &res);
  87        if (err)
  88                goto out_free;
  89        priv->regs = ioremap(res.start, resource_size(&res));
  90        if (priv->regs == NULL) {
  91                err = -ENOMEM;
  92                goto out_free;
  93        }
  94
  95        snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
  96        bus->priv = priv;
  97
  98        bus->parent = dev;
  99        dev_set_drvdata(dev, bus);
 100
 101        /* set MII speed */
 102        out_be32(&priv->regs->mii_speed,
 103                ((mpc5xxx_get_bus_frequency(of->dev.of_node) >> 20) / 5) << 1);
 104
 105        err = of_mdiobus_register(bus, np);
 106        if (err)
 107                goto out_unmap;
 108
 109        return 0;
 110
 111 out_unmap:
 112        iounmap(priv->regs);
 113 out_free:
 114        kfree(priv);
 115        mdiobus_free(bus);
 116
 117        return err;
 118}
 119
 120static int mpc52xx_fec_mdio_remove(struct platform_device *of)
 121{
 122        struct mii_bus *bus = platform_get_drvdata(of);
 123        struct mpc52xx_fec_mdio_priv *priv = bus->priv;
 124
 125        mdiobus_unregister(bus);
 126        iounmap(priv->regs);
 127        kfree(priv);
 128        mdiobus_free(bus);
 129
 130        return 0;
 131}
 132
 133static const struct of_device_id mpc52xx_fec_mdio_match[] = {
 134        { .compatible = "fsl,mpc5200b-mdio", },
 135        { .compatible = "fsl,mpc5200-mdio", },
 136        { .compatible = "mpc5200b-fec-phy", },
 137        {}
 138};
 139MODULE_DEVICE_TABLE(of, mpc52xx_fec_mdio_match);
 140
 141struct platform_driver mpc52xx_fec_mdio_driver = {
 142        .driver = {
 143                .name = "mpc5200b-fec-phy",
 144                .owner = THIS_MODULE,
 145                .of_match_table = mpc52xx_fec_mdio_match,
 146        },
 147        .probe = mpc52xx_fec_mdio_probe,
 148        .remove = mpc52xx_fec_mdio_remove,
 149};
 150
 151/* let fec driver call it, since this has to be registered before it */
 152EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
 153
 154MODULE_LICENSE("Dual BSD/GPL");
 155