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1/*2 * Driver for the MPC5200 Fast Ethernet Controller - MDIO bus driver3 *4 * Copyright (C) 2007 Domen Puncer, Telargo, Inc.5 * Copyright (C) 2008 Wolfram Sang, Pengutronix6 *7 * This file is licensed under the terms of the GNU General Public License8 * version 2. This program is licensed "as is" without any warranty of any9 * 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/slab.h>17#include <linux/of.h>18#include <linux/of_address.h>19#include <linux/of_mdio.h>20#include <linux/platform_device.h>21#include <asm/io.h>22#include <asm/mpc52xx.h>23#include "fec_mpc52xx.h"24 25struct mpc52xx_fec_mdio_priv {26 struct mpc52xx_fec __iomem *regs;27};28 29static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,30 int reg, u32 value)31{32 struct mpc52xx_fec_mdio_priv *priv = bus->priv;33 struct mpc52xx_fec __iomem *fec = priv->regs;34 int tries = 3;35 36 value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;37 value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;38 39 out_be32(&fec->ievent, FEC_IEVENT_MII);40 out_be32(&fec->mii_data, value);41 42 /* wait for it to finish, this takes about 23 us on lite5200b */43 while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)44 msleep(1);45 46 if (!tries)47 return -ETIMEDOUT;48 49 return value & FEC_MII_DATA_OP_RD ?50 in_be32(&fec->mii_data) & FEC_MII_DATA_DATAMSK : 0;51}52 53static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)54{55 return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);56}57 58static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,59 u16 data)60{61 return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,62 data | FEC_MII_WRITE_FRAME);63}64 65static int mpc52xx_fec_mdio_probe(struct platform_device *of)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 registers */88 err = of_address_to_resource(np, 0, &res);89 if (err)90 goto out_free;91 priv->regs = ioremap(res.start, resource_size(&res));92 if (priv->regs == NULL) {93 err = -ENOMEM;94 goto out_free;95 }96 97 snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);98 bus->priv = priv;99 100 bus->parent = dev;101 dev_set_drvdata(dev, bus);102 103 /* set MII speed */104 out_be32(&priv->regs->mii_speed, ((mpc5xxx_get_bus_frequency(dev) >> 20) / 5) << 1);105 106 err = of_mdiobus_register(bus, np);107 if (err)108 goto out_unmap;109 110 return 0;111 112 out_unmap:113 iounmap(priv->regs);114 out_free:115 kfree(priv);116 mdiobus_free(bus);117 118 return err;119}120 121static void mpc52xx_fec_mdio_remove(struct platform_device *of)122{123 struct mii_bus *bus = platform_get_drvdata(of);124 struct mpc52xx_fec_mdio_priv *priv = bus->priv;125 126 mdiobus_unregister(bus);127 iounmap(priv->regs);128 kfree(priv);129 mdiobus_free(bus);130}131 132static const struct of_device_id mpc52xx_fec_mdio_match[] = {133 { .compatible = "fsl,mpc5200b-mdio", },134 { .compatible = "fsl,mpc5200-mdio", },135 { .compatible = "mpc5200b-fec-phy", },136 {}137};138MODULE_DEVICE_TABLE(of, mpc52xx_fec_mdio_match);139 140struct platform_driver mpc52xx_fec_mdio_driver = {141 .driver = {142 .name = "mpc5200b-fec-phy",143 .owner = THIS_MODULE,144 .of_match_table = mpc52xx_fec_mdio_match,145 },146 .probe = mpc52xx_fec_mdio_probe,147 .remove_new = mpc52xx_fec_mdio_remove,148};149 150/* let fec driver call it, since this has to be registered before it */151EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);152 153MODULE_LICENSE("Dual BSD/GPL");154