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/*
* Driver for the MPC5200 Fast Ethernet Controller - MDIO bus driver
*
* Copyright (C) 2007 Domen Puncer, Telargo, Inc.
*
* 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 <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_read(struct mii_bus *bus, int phy_id, int reg)
{
struct mpc52xx_fec_mdio_priv *priv = bus->priv;
struct mpc52xx_fec __iomem *fec;
int tries = 100;
u32 request = FEC_MII_READ_FRAME;
fec = priv->regs;
out_be32(&fec->ievent, FEC_IEVENT_MII);
request |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
request |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
out_be32(&priv->regs->mii_data, request);
/* wait for it to finish, this takes about 23 us on lite5200b */
while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
udelay(5);
if (tries == 0)
return -ETIMEDOUT;
return in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK;
}
static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 data)
{
struct mpc52xx_fec_mdio_priv *priv = bus->priv;
struct mpc52xx_fec __iomem *fec;
u32 value = data;
int tries = 100;
fec = priv->regs;
out_be32(&fec->ievent, FEC_IEVENT_MII);
value |= FEC_MII_WRITE_FRAME;
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(&priv->regs->mii_data, value);
/* wait for request to finish */
while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
udelay(5);
if (tries == 0)
return -ETIMEDOUT;
return 0;
}
static int mpc52xx_fec_mdio_probe(struct of_device *of, const struct of_device_id *match)
{
struct device *dev = &of->dev;
struct device_node *np = of->node;
struct device_node *child = NULL;
struct mii_bus *bus;
struct mpc52xx_fec_mdio_priv *priv;
struct resource res = {};
int err;
int i;
bus = kzalloc(sizeof(*bus), GFP_KERNEL);
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 irqs */
bus->irq = kmalloc(sizeof(bus->irq[0]) * PHY_MAX_ADDR, GFP_KERNEL);
if (bus->irq == NULL) {
err = -ENOMEM;
goto out_free;
}
for (i=0; i<PHY_MAX_ADDR; i++)
bus->irq[i] = PHY_POLL;
while ((child = of_get_next_child(np, child)) != NULL) {
int irq = irq_of_parse_and_map(child, 0);
if (irq != NO_IRQ) {
const u32 *id = of_get_property(child, "reg", NULL);
bus->irq[*id] = irq;
}
}
/* setup registers */
err = of_address_to_resource(np, 0, &res);
if (err)
goto out_free;
priv->regs = ioremap(res.start, res.end - res.start + 1);
if (priv->regs == NULL) {
err = -ENOMEM;
goto out_free;
}
bus->id = res.start;
bus->priv = priv;
bus->dev = dev;
dev_set_drvdata(dev, bus);
/* set MII speed */
out_be32(&priv->regs->mii_speed, ((mpc52xx_find_ipb_freq(of->node) >> 20) / 5) << 1);
/* enable MII interrupt */
out_be32(&priv->regs->imask, in_be32(&priv->regs->imask) | FEC_IMASK_MII);
err = mdiobus_register(bus);
if (err)
goto out_unmap;
return 0;
out_unmap:
iounmap(priv->regs);
out_free:
for (i=0; i<PHY_MAX_ADDR; i++)
if (bus->irq[i] != PHY_POLL)
irq_dispose_mapping(bus->irq[i]);
kfree(bus->irq);
kfree(priv);
kfree(bus);
return err;
}
static int mpc52xx_fec_mdio_remove(struct of_device *of)
{
struct device *dev = &of->dev;
struct mii_bus *bus = dev_get_drvdata(dev);
struct mpc52xx_fec_mdio_priv *priv = bus->priv;
int i;
mdiobus_unregister(bus);
dev_set_drvdata(dev, NULL);
iounmap(priv->regs);
for (i=0; i<PHY_MAX_ADDR; i++)
if (bus->irq[i])
irq_dispose_mapping(bus->irq[i]);
kfree(priv);
kfree(bus->irq);
kfree(bus);
return 0;
}
static struct of_device_id mpc52xx_fec_mdio_match[] = {
{
.type = "mdio",
.compatible = "mpc5200b-fec-phy",
},
{},
};
struct of_platform_driver mpc52xx_fec_mdio_driver = {
.name = "mpc5200b-fec-phy",
.probe = mpc52xx_fec_mdio_probe,
.remove = mpc52xx_fec_mdio_remove,
.match_table = mpc52xx_fec_mdio_match,
};
/* 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");
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