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authorTobias Waldekranz <tobias@waldekranz.com>2020-03-23 11:14:14 +0100
committerDavid S. Miller <davem@davemloft.net>2020-03-27 03:49:34 +0100
commit04e37d92fbed45c6b57263c0cb262cf8fa5df0e2 (patch)
tree938be9d6540046e90e4ba1a1c0955b5bd12836bd
parentdt-bindings: net: add marvell usb to mdio bindings (diff)
downloadlinux-04e37d92fbed45c6b57263c0cb262cf8fa5df0e2.tar.xz
linux-04e37d92fbed45c6b57263c0cb262cf8fa5df0e2.zip
net: phy: add marvell usb to mdio controller
An MDIO controller present on development boards for Marvell switches from the Link Street (88E6xxx) family. Using this module, you can use the following setup as a development platform for switchdev and DSA related work. .-------. .-----------------. | USB----USB | | SoC | | 88E6390X-DB ETH1-10 | ETH----ETH0 | '-------' '-----------------' Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--MAINTAINERS1
-rw-r--r--drivers/net/phy/Kconfig7
-rw-r--r--drivers/net/phy/Makefile1
-rw-r--r--drivers/net/phy/mdio-mvusb.c120
4 files changed, 129 insertions, 0 deletions
diff --git a/MAINTAINERS b/MAINTAINERS
index 8e091a7566c9..fbc5ee74ac92 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10110,6 +10110,7 @@ MARVELL USB MDIO CONTROLLER DRIVER
M: Tobias Waldekranz <tobias@waldekranz.com>
L: netdev@vger.kernel.org
S: Maintained
+F: drivers/net/phy/mdio-mvusb.c
F: Documentation/devicetree/bindings/net/marvell,mvusb.yaml
MARVELL XENON MMC/SD/SDIO HOST CONTROLLER DRIVER
diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index cc7f1df855da..3fa33d27eeba 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -179,6 +179,13 @@ config MDIO_MSCC_MIIM
This driver supports the MIIM (MDIO) interface found in the network
switches of the Microsemi SoCs
+config MDIO_MVUSB
+ tristate "Marvell USB to MDIO Adapter"
+ depends on USB
+ help
+ A USB to MDIO converter present on development boards for
+ Marvell's Link Street family of Ethernet switches.
+
config MDIO_OCTEON
tristate "Octeon and some ThunderX SOCs MDIO buses"
depends on (64BIT && OF_MDIO) || COMPILE_TEST
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index 70774ab474e6..2f5c7093a65b 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -40,6 +40,7 @@ obj-$(CONFIG_MDIO_I2C) += mdio-i2c.o
obj-$(CONFIG_MDIO_IPQ8064) += mdio-ipq8064.o
obj-$(CONFIG_MDIO_MOXART) += mdio-moxart.o
obj-$(CONFIG_MDIO_MSCC_MIIM) += mdio-mscc-miim.o
+obj-$(CONFIG_MDIO_MVUSB) += mdio-mvusb.o
obj-$(CONFIG_MDIO_OCTEON) += mdio-octeon.o
obj-$(CONFIG_MDIO_SUN4I) += mdio-sun4i.o
obj-$(CONFIG_MDIO_THUNDER) += mdio-thunder.o
diff --git a/drivers/net/phy/mdio-mvusb.c b/drivers/net/phy/mdio-mvusb.c
new file mode 100644
index 000000000000..d5eabddfdf51
--- /dev/null
+++ b/drivers/net/phy/mdio-mvusb.c
@@ -0,0 +1,120 @@
+// 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;
+
+ if (dev & MII_ADDR_C45)
+ return -EOPNOTSUPP;
+
+ 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;
+
+ if (dev & MII_ADDR_C45)
+ return -EOPNOTSUPP;
+
+ 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");