/* * 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 * kind, whether express or implied. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/netdevice.h> #include <linux/phy.h> #include <linux/of_platform.h> #include <linux/slab.h> #include <linux/of_mdio.h> #include <asm/io.h> #include <asm/mpc52xx.h> #include "fec_mpc52xx.h" struct mpc52xx_fec_mdio_priv { struct mpc52xx_fec __iomem *regs; }; 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 = priv->regs; int tries = 3; 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(&fec->ievent, FEC_IEVENT_MII); out_be32(&fec->mii_data, value); /* wait for it to finish, this takes about 23 us on lite5200b */ while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries) msleep(1); if (!tries) return -ETIMEDOUT; return value & FEC_MII_DATA_OP_RD ? in_be32(&fec->mii_data) & FEC_MII_DATA_DATAMSK : 0; } static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg) { return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME); } 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 platform_device *of) { struct device *dev = &of->dev; struct device_node *np = of->dev.of_node; struct mii_bus *bus; struct mpc52xx_fec_mdio_priv *priv; struct resource res; int err; bus = mdiobus_alloc(); if (bus == NULL) return -ENOMEM; priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (priv == NULL) { err = -ENOMEM; goto out_free; } bus->name = "mpc52xx MII bus"; bus->read = mpc52xx_fec_mdio_read; bus->write = mpc52xx_fec_mdio_write; /* setup registers */ err = of_address_to_resource(np, 0, &res); if (err) goto out_free; priv->regs = ioremap(res.start, resource_size(&res)); if (priv->regs == NULL) { err = -ENOMEM; goto out_free; } snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start); bus->priv = priv; bus->parent = dev; dev_set_drvdata(dev, bus); /* set MII speed */ out_be32(&priv->regs->mii_speed, ((mpc5xxx_get_bus_frequency(of->dev.of_node) >> 20) / 5) << 1); err = of_mdiobus_register(bus, np); if (err) goto out_unmap; return 0; out_unmap: iounmap(priv->regs); out_free: kfree(priv); mdiobus_free(bus); return err; } static int mpc52xx_fec_mdio_remove(struct platform_device *of) { struct mii_bus *bus = platform_get_drvdata(of); struct mpc52xx_fec_mdio_priv *priv = bus->priv; mdiobus_unregister(bus); iounmap(priv->regs); kfree(priv); mdiobus_free(bus); return 0; } static const struct of_device_id mpc52xx_fec_mdio_match[] = { { .compatible = "fsl,mpc5200b-mdio", }, { .compatible = "fsl,mpc5200-mdio", }, { .compatible = "mpc5200b-fec-phy", }, {} }; MODULE_DEVICE_TABLE(of, mpc52xx_fec_mdio_match); struct platform_driver mpc52xx_fec_mdio_driver = { .driver = { .name = "mpc5200b-fec-phy", .owner = THIS_MODULE, .of_match_table = mpc52xx_fec_mdio_match, }, .probe = mpc52xx_fec_mdio_probe, .remove = mpc52xx_fec_mdio_remove, }; /* let fec driver call it, since this has to be registered before it */ EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver); MODULE_LICENSE("Dual BSD/GPL");