LXR linux/drivers/net/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        int mdio_irqs[PHY_MAX_ADDR];
  26};
  27
  28static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
  29                int reg, u32 value)
  30{
  31        struct mpc52xx_fec_mdio_priv *priv = bus->priv;
  32        struct mpc52xx_fec __iomem *fec = priv->regs;
  33        int tries = 3;
  34
  35        value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
  36        value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
  37
  38        out_be32(&fec->ievent, FEC_IEVENT_MII);
  39        out_be32(&fec->mii_data, value);
  40
  41        /* wait for it to finish, this takes about 23 us on lite5200b */
  42        while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
  43                msleep(1);
  44
  45        if (!tries)
  46                return -ETIMEDOUT;
  47
  48        return value & FEC_MII_DATA_OP_RD ?
  49                in_be32(&fec->mii_data) & FEC_MII_DATA_DATAMSK : 0;
  50}
  51
  52static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
  53{
  54        return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);
  55}
  56
  57static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,
  58                u16 data)
  59{
  60        return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,
  61                data | FEC_MII_WRITE_FRAME);
  62}
  63
  64static int mpc52xx_fec_mdio_probe(struct platform_device *of,
  65                const struct of_device_id *match)
  66{
  67        struct device *dev = &of->dev;
  68        struct device_node *np = of->dev.of_node;
  69        struct mii_bus *bus;
  70        struct mpc52xx_fec_mdio_priv *priv;
  71        struct resource res;
  72        int err;
  73
  74        bus = mdiobus_alloc();
  75        if (bus == NULL)
  76                return -ENOMEM;
  77        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
  78        if (priv == NULL) {
  79                err = -ENOMEM;
  80                goto out_free;
  81        }
  82
  83        bus->name = "mpc52xx MII bus";
  84        bus->read = mpc52xx_fec_mdio_read;
  85        bus->write = mpc52xx_fec_mdio_write;
  86
  87        /* setup irqs */
  88        bus->irq = priv->mdio_irqs;
  89
  90        /* setup registers */
  91        err = of_address_to_resource(np, 0, &res);
  92        if (err)
  93                goto out_free;
  94        priv->regs = ioremap(res.start, resource_size(&res));
  95        if (priv->regs == NULL) {
  96                err = -ENOMEM;
  97                goto out_free;
  98        }
  99
 100        snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
 101        bus->priv = priv;
 102
 103        bus->parent = dev;
 104        dev_set_drvdata(dev, bus);
 105
 106        /* set MII speed */
 107        out_be32(&priv->regs->mii_speed,
 108                ((mpc5xxx_get_bus_frequency(of->dev.of_node) >> 20) / 5) << 1);
 109
 110        err = of_mdiobus_register(bus, np);
 111        if (err)
 112                goto out_unmap;
 113
 114        return 0;
 115
 116 out_unmap:
 117        iounmap(priv->regs);
 118 out_free:
 119        kfree(priv);
 120        mdiobus_free(bus);
 121
 122        return err;
 123}
 124
 125static int mpc52xx_fec_mdio_remove(struct platform_device *of)
 126{
 127        struct device *dev = &of->dev;
 128        struct mii_bus *bus = dev_get_drvdata(dev);
 129        struct mpc52xx_fec_mdio_priv *priv = bus->priv;
 130
 131        mdiobus_unregister(bus);
 132        dev_set_drvdata(dev, NULL);
 133        iounmap(priv->regs);
 134        kfree(priv);
 135        mdiobus_free(bus);
 136
 137        return 0;
 138}
 139
 140static struct of_device_id mpc52xx_fec_mdio_match[] = {
 141        { .compatible = "fsl,mpc5200b-mdio", },
 142        { .compatible = "fsl,mpc5200-mdio", },
 143        { .compatible = "mpc5200b-fec-phy", },
 144        {}
 145};
 146MODULE_DEVICE_TABLE(of, mpc52xx_fec_mdio_match);
 147
 148struct of_platform_driver mpc52xx_fec_mdio_driver = {
 149        .driver = {
 150                .name = "mpc5200b-fec-phy",
 151                .owner = THIS_MODULE,
 152                .of_match_table = mpc52xx_fec_mdio_match,
 153        },
 154        .probe = mpc52xx_fec_mdio_probe,
 155        .remove = mpc52xx_fec_mdio_remove,
 156};
 157
 158/* let fec driver call it, since this has to be registered before it */
 159EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
 160
 161MODULE_LICENSE("Dual BSD/GPL");
 162