2 * Driver for the MPC5200 Fast Ethernet Controller - MDIO bus driver
4 * Copyright (C) 2007 Domen Puncer, Telargo, Inc.
5 * Copyright (C) 2008 Wolfram Sang, Pengutronix
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.
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>
20 #include <asm/mpc52xx.h>
21 #include "fec_mpc52xx.h"
23 struct mpc52xx_fec_mdio_priv {
24 struct mpc52xx_fec __iomem *regs;
25 int mdio_irqs[PHY_MAX_ADDR];
28 static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
31 struct mpc52xx_fec_mdio_priv *priv = bus->priv;
32 struct mpc52xx_fec __iomem *fec = priv->regs;
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;
38 out_be32(&fec->ievent, FEC_IEVENT_MII);
39 out_be32(&fec->mii_data, value);
41 /* wait for it to finish, this takes about 23 us on lite5200b */
42 while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
48 return value & FEC_MII_DATA_OP_RD ?
49 in_be32(&fec->mii_data) & FEC_MII_DATA_DATAMSK : 0;
52 static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
54 return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);
57 static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,
60 return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,
61 data | FEC_MII_WRITE_FRAME);
64 static int mpc52xx_fec_mdio_probe(struct platform_device *of,
65 const struct of_device_id *match)
67 struct device *dev = &of->dev;
68 struct device_node *np = of->dev.of_node;
70 struct mpc52xx_fec_mdio_priv *priv;
74 bus = mdiobus_alloc();
77 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
83 bus->name = "mpc52xx MII bus";
84 bus->read = mpc52xx_fec_mdio_read;
85 bus->write = mpc52xx_fec_mdio_write;
88 bus->irq = priv->mdio_irqs;
91 err = of_address_to_resource(np, 0, &res);
94 priv->regs = ioremap(res.start, resource_size(&res));
95 if (priv->regs == NULL) {
100 snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
104 dev_set_drvdata(dev, bus);
107 out_be32(&priv->regs->mii_speed,
108 ((mpc5xxx_get_bus_frequency(of->dev.of_node) >> 20) / 5) << 1);
110 err = of_mdiobus_register(bus, np);
125 static int mpc52xx_fec_mdio_remove(struct platform_device *of)
127 struct device *dev = &of->dev;
128 struct mii_bus *bus = dev_get_drvdata(dev);
129 struct mpc52xx_fec_mdio_priv *priv = bus->priv;
131 mdiobus_unregister(bus);
132 dev_set_drvdata(dev, NULL);
140 static struct of_device_id mpc52xx_fec_mdio_match[] = {
141 { .compatible = "fsl,mpc5200b-mdio", },
142 { .compatible = "fsl,mpc5200-mdio", },
143 { .compatible = "mpc5200b-fec-phy", },
146 MODULE_DEVICE_TABLE(of, mpc52xx_fec_mdio_match);
148 struct of_platform_driver mpc52xx_fec_mdio_driver = {
150 .name = "mpc5200b-fec-phy",
151 .owner = THIS_MODULE,
152 .of_match_table = mpc52xx_fec_mdio_match,
154 .probe = mpc52xx_fec_mdio_probe,
155 .remove = mpc52xx_fec_mdio_remove,
158 /* let fec driver call it, since this has to be registered before it */
159 EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
161 MODULE_LICENSE("Dual BSD/GPL");