// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_mdio.h>
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#include <linux/phy.h>
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#include <linux/usb.h>
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#define USB_MARVELL_VID 0x1286
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static const struct usb_device_id mvusb_mdio_table[] = {
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{ USB_DEVICE(USB_MARVELL_VID, 0x1fa4) },
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{}
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};
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MODULE_DEVICE_TABLE(usb, mvusb_mdio_table);
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enum {
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MVUSB_CMD_PREAMBLE0,
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MVUSB_CMD_PREAMBLE1,
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MVUSB_CMD_ADDR,
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MVUSB_CMD_VAL,
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};
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struct mvusb_mdio {
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struct usb_device *udev;
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struct mii_bus *mdio;
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__le16 buf[4];
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};
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static int mvusb_mdio_read(struct mii_bus *mdio, int dev, int reg)
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{
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struct mvusb_mdio *mvusb = mdio->priv;
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int err, alen;
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if (dev & MII_ADDR_C45)
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return -EOPNOTSUPP;
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mvusb->buf[MVUSB_CMD_ADDR] = cpu_to_le16(0xa400 | (dev << 5) | reg);
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err = usb_bulk_msg(mvusb->udev, usb_sndbulkpipe(mvusb->udev, 2),
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mvusb->buf, 6, &alen, 100);
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if (err)
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return err;
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err = usb_bulk_msg(mvusb->udev, usb_rcvbulkpipe(mvusb->udev, 6),
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&mvusb->buf[MVUSB_CMD_VAL], 2, &alen, 100);
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if (err)
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return err;
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return le16_to_cpu(mvusb->buf[MVUSB_CMD_VAL]);
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}
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static int mvusb_mdio_write(struct mii_bus *mdio, int dev, int reg, u16 val)
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{
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struct mvusb_mdio *mvusb = mdio->priv;
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int alen;
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if (dev & MII_ADDR_C45)
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return -EOPNOTSUPP;
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mvusb->buf[MVUSB_CMD_ADDR] = cpu_to_le16(0x8000 | (dev << 5) | reg);
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mvusb->buf[MVUSB_CMD_VAL] = cpu_to_le16(val);
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return usb_bulk_msg(mvusb->udev, usb_sndbulkpipe(mvusb->udev, 2),
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mvusb->buf, 8, &alen, 100);
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}
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static int mvusb_mdio_probe(struct usb_interface *interface,
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const struct usb_device_id *id)
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{
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struct device *dev = &interface->dev;
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struct mvusb_mdio *mvusb;
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struct mii_bus *mdio;
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mdio = devm_mdiobus_alloc_size(dev, sizeof(*mvusb));
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if (!mdio)
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return -ENOMEM;
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mvusb = mdio->priv;
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mvusb->mdio = mdio;
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mvusb->udev = usb_get_dev(interface_to_usbdev(interface));
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/* Reversed from USB PCAPs, no idea what these mean. */
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mvusb->buf[MVUSB_CMD_PREAMBLE0] = cpu_to_le16(0xe800);
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mvusb->buf[MVUSB_CMD_PREAMBLE1] = cpu_to_le16(0x0001);
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snprintf(mdio->id, MII_BUS_ID_SIZE, "mvusb-%s", dev_name(dev));
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mdio->name = mdio->id;
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mdio->parent = dev;
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mdio->read = mvusb_mdio_read;
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mdio->write = mvusb_mdio_write;
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usb_set_intfdata(interface, mvusb);
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return of_mdiobus_register(mdio, dev->of_node);
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}
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static void mvusb_mdio_disconnect(struct usb_interface *interface)
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{
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struct mvusb_mdio *mvusb = usb_get_intfdata(interface);
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struct usb_device *udev = mvusb->udev;
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mdiobus_unregister(mvusb->mdio);
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usb_set_intfdata(interface, NULL);
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usb_put_dev(udev);
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}
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static struct usb_driver mvusb_mdio_driver = {
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.name = "mvusb_mdio",
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.id_table = mvusb_mdio_table,
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.probe = mvusb_mdio_probe,
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.disconnect = mvusb_mdio_disconnect,
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};
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module_usb_driver(mvusb_mdio_driver);
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MODULE_AUTHOR("Tobias Waldekranz <tobias@waldekranz.com>");
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MODULE_DESCRIPTION("Marvell USB MDIO Adapter");
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MODULE_LICENSE("GPL");
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