170 lines
3.9 KiB
C
170 lines
3.9 KiB
C
/*
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* Driver for the MPC5200 Fast Ethernet Controller - MDIO bus driver
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*
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* Copyright (C) 2007 Domen Puncer, Telargo, Inc.
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* Copyright (C) 2008 Wolfram Sang, Pengutronix
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/phy.h>
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#include <linux/of_platform.h>
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#include <linux/of_mdio.h>
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#include <asm/io.h>
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#include <asm/mpc52xx.h>
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#include "fec_mpc52xx.h"
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struct mpc52xx_fec_mdio_priv {
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struct mpc52xx_fec __iomem *regs;
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int mdio_irqs[PHY_MAX_ADDR];
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};
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static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
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int reg, u32 value)
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{
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struct mpc52xx_fec_mdio_priv *priv = bus->priv;
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struct mpc52xx_fec __iomem *fec;
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int tries = 3;
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value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
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value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
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fec = priv->regs;
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out_be32(&fec->ievent, FEC_IEVENT_MII);
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out_be32(&priv->regs->mii_data, value);
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/* wait for it to finish, this takes about 23 us on lite5200b */
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while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
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msleep(1);
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if (!tries)
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return -ETIMEDOUT;
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return value & FEC_MII_DATA_OP_RD ?
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in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK : 0;
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}
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static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
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{
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return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);
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}
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static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,
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u16 data)
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{
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return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,
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data | FEC_MII_WRITE_FRAME);
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}
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static int mpc52xx_fec_mdio_probe(struct of_device *of,
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const struct of_device_id *match)
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{
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struct device *dev = &of->dev;
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struct device_node *np = of->node;
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struct mii_bus *bus;
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struct mpc52xx_fec_mdio_priv *priv;
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struct resource res = {};
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int err;
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int i;
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bus = mdiobus_alloc();
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if (bus == NULL)
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return -ENOMEM;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (priv == NULL) {
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err = -ENOMEM;
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goto out_free;
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}
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bus->name = "mpc52xx MII bus";
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bus->read = mpc52xx_fec_mdio_read;
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bus->write = mpc52xx_fec_mdio_write;
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/* setup irqs */
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bus->irq = priv->mdio_irqs;
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/* setup registers */
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err = of_address_to_resource(np, 0, &res);
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if (err)
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goto out_free;
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priv->regs = ioremap(res.start, res.end - res.start + 1);
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if (priv->regs == NULL) {
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err = -ENOMEM;
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goto out_free;
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}
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snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
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bus->priv = priv;
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bus->parent = dev;
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dev_set_drvdata(dev, bus);
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/* set MII speed */
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out_be32(&priv->regs->mii_speed,
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((mpc5xxx_get_bus_frequency(of->node) >> 20) / 5) << 1);
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err = of_mdiobus_register(bus, np);
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if (err)
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goto out_unmap;
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return 0;
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out_unmap:
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iounmap(priv->regs);
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out_free:
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for (i=0; i<PHY_MAX_ADDR; i++)
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if (bus->irq[i] != PHY_POLL)
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irq_dispose_mapping(bus->irq[i]);
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kfree(bus->irq);
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kfree(priv);
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mdiobus_free(bus);
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return err;
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}
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static int mpc52xx_fec_mdio_remove(struct of_device *of)
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{
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struct device *dev = &of->dev;
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struct mii_bus *bus = dev_get_drvdata(dev);
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struct mpc52xx_fec_mdio_priv *priv = bus->priv;
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int i;
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mdiobus_unregister(bus);
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dev_set_drvdata(dev, NULL);
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iounmap(priv->regs);
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for (i=0; i<PHY_MAX_ADDR; i++)
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if (bus->irq[i] != PHY_POLL)
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irq_dispose_mapping(bus->irq[i]);
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kfree(priv);
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kfree(bus->irq);
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mdiobus_free(bus);
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return 0;
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}
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static struct of_device_id mpc52xx_fec_mdio_match[] = {
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{ .compatible = "fsl,mpc5200b-mdio", },
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{ .compatible = "fsl,mpc5200-mdio", },
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{ .compatible = "mpc5200b-fec-phy", },
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{}
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};
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struct of_platform_driver mpc52xx_fec_mdio_driver = {
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.name = "mpc5200b-fec-phy",
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.probe = mpc52xx_fec_mdio_probe,
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.remove = mpc52xx_fec_mdio_remove,
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.match_table = mpc52xx_fec_mdio_match,
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};
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/* let fec driver call it, since this has to be registered before it */
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EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
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MODULE_LICENSE("Dual BSD/GPL");
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