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>
18 #include <asm/mpc52xx.h>
19 #include "fec_mpc52xx.h"
21 struct mpc52xx_fec_mdio_priv {
22 struct mpc52xx_fec __iomem *regs;
25 static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
28 struct mpc52xx_fec_mdio_priv *priv = bus->priv;
29 struct mpc52xx_fec __iomem *fec;
32 value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
33 value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
36 out_be32(&fec->ievent, FEC_IEVENT_MII);
37 out_be32(&priv->regs->mii_data, value);
39 /* wait for it to finish, this takes about 23 us on lite5200b */
40 while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
46 return value & FEC_MII_DATA_OP_RD ?
47 in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK : 0;
50 static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
52 return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);
55 static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,
58 return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,
59 data | FEC_MII_WRITE_FRAME);
62 static int mpc52xx_fec_mdio_probe(struct of_device *of,
63 const struct of_device_id *match)
65 struct device *dev = &of->dev;
66 struct device_node *np = of->node;
67 struct device_node *child = NULL;
69 struct mpc52xx_fec_mdio_priv *priv;
70 struct resource res = {};
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 = kmalloc(sizeof(bus->irq[0]) * PHY_MAX_ADDR, GFP_KERNEL);
89 if (bus->irq == NULL) {
93 for (i=0; i<PHY_MAX_ADDR; i++)
94 bus->irq[i] = PHY_POLL;
96 while ((child = of_get_next_child(np, child)) != NULL) {
97 int irq = irq_of_parse_and_map(child, 0);
99 const u32 *id = of_get_property(child, "reg", NULL);
105 /* setup registers */
106 err = of_address_to_resource(np, 0, &res);
109 priv->regs = ioremap(res.start, res.end - res.start + 1);
110 if (priv->regs == NULL) {
115 snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
119 dev_set_drvdata(dev, bus);
122 out_be32(&priv->regs->mii_speed,
123 ((mpc52xx_find_ipb_freq(of->node) >> 20) / 5) << 1);
125 err = mdiobus_register(bus);
134 for (i=0; i<PHY_MAX_ADDR; i++)
135 if (bus->irq[i] != PHY_POLL)
136 irq_dispose_mapping(bus->irq[i]);
144 static int mpc52xx_fec_mdio_remove(struct of_device *of)
146 struct device *dev = &of->dev;
147 struct mii_bus *bus = dev_get_drvdata(dev);
148 struct mpc52xx_fec_mdio_priv *priv = bus->priv;
151 mdiobus_unregister(bus);
152 dev_set_drvdata(dev, NULL);
155 for (i=0; i<PHY_MAX_ADDR; i++)
156 if (bus->irq[i] != PHY_POLL)
157 irq_dispose_mapping(bus->irq[i]);
166 static struct of_device_id mpc52xx_fec_mdio_match[] = {
167 { .compatible = "fsl,mpc5200b-mdio", },
168 { .compatible = "fsl,mpc5200-mdio", },
169 { .compatible = "mpc5200b-fec-phy", },
173 struct of_platform_driver mpc52xx_fec_mdio_driver = {
174 .name = "mpc5200b-fec-phy",
175 .probe = mpc52xx_fec_mdio_probe,
176 .remove = mpc52xx_fec_mdio_remove,
177 .match_table = mpc52xx_fec_mdio_match,
180 /* let fec driver call it, since this has to be registered before it */
181 EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
184 MODULE_LICENSE("Dual BSD/GPL");