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// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_mdio.h>
#include <linux/phy.h>
#include <linux/usb.h>
#define USB_MARVELL_VID 0x1286
static const struct usb_device_id mvusb_mdio_table[] = {
{ USB_DEVICE(USB_MARVELL_VID, 0x1fa4) },
{}
};
MODULE_DEVICE_TABLE(usb, mvusb_mdio_table);
enum {
MVUSB_CMD_PREAMBLE0,
MVUSB_CMD_PREAMBLE1,
MVUSB_CMD_ADDR,
MVUSB_CMD_VAL,
};
struct mvusb_mdio {
struct usb_device *udev;
struct mii_bus *mdio;
__le16 buf[4];
};
static int mvusb_mdio_read(struct mii_bus *mdio, int dev, int reg)
{
struct mvusb_mdio *mvusb = mdio->priv;
int err, alen;
mvusb->buf[MVUSB_CMD_ADDR] = cpu_to_le16(0xa400 | (dev << 5) | reg);
err = usb_bulk_msg(mvusb->udev, usb_sndbulkpipe(mvusb->udev, 2),
mvusb->buf, 6, &alen, 100);
if (err)
return err;
err = usb_bulk_msg(mvusb->udev, usb_rcvbulkpipe(mvusb->udev, 6),
&mvusb->buf[MVUSB_CMD_VAL], 2, &alen, 100);
if (err)
return err;
return le16_to_cpu(mvusb->buf[MVUSB_CMD_VAL]);
}
static int mvusb_mdio_write(struct mii_bus *mdio, int dev, int reg, u16 val)
{
struct mvusb_mdio *mvusb = mdio->priv;
int alen;
mvusb->buf[MVUSB_CMD_ADDR] = cpu_to_le16(0x8000 | (dev << 5) | reg);
mvusb->buf[MVUSB_CMD_VAL] = cpu_to_le16(val);
return usb_bulk_msg(mvusb->udev, usb_sndbulkpipe(mvusb->udev, 2),
mvusb->buf, 8, &alen, 100);
}
static int mvusb_mdio_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct device *dev = &interface->dev;
struct mvusb_mdio *mvusb;
struct mii_bus *mdio;
mdio = devm_mdiobus_alloc_size(dev, sizeof(*mvusb));
if (!mdio)
return -ENOMEM;
mvusb = mdio->priv;
mvusb->mdio = mdio;
mvusb->udev = usb_get_dev(interface_to_usbdev(interface));
/* Reversed from USB PCAPs, no idea what these mean. */
mvusb->buf[MVUSB_CMD_PREAMBLE0] = cpu_to_le16(0xe800);
mvusb->buf[MVUSB_CMD_PREAMBLE1] = cpu_to_le16(0x0001);
snprintf(mdio->id, MII_BUS_ID_SIZE, "mvusb-%s", dev_name(dev));
mdio->name = mdio->id;
mdio->parent = dev;
mdio->read = mvusb_mdio_read;
mdio->write = mvusb_mdio_write;
usb_set_intfdata(interface, mvusb);
return of_mdiobus_register(mdio, dev->of_node);
}
static void mvusb_mdio_disconnect(struct usb_interface *interface)
{
struct mvusb_mdio *mvusb = usb_get_intfdata(interface);
struct usb_device *udev = mvusb->udev;
mdiobus_unregister(mvusb->mdio);
usb_set_intfdata(interface, NULL);
usb_put_dev(udev);
}
static struct usb_driver mvusb_mdio_driver = {
.name = "mvusb_mdio",
.id_table = mvusb_mdio_table,
.probe = mvusb_mdio_probe,
.disconnect = mvusb_mdio_disconnect,
};
module_usb_driver(mvusb_mdio_driver);
MODULE_AUTHOR("Tobias Waldekranz <tobias@waldekranz.com>");
MODULE_DESCRIPTION("Marvell USB MDIO Adapter");
MODULE_LICENSE("GPL");
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