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path: root/drivers/net/usb/r8153_ecm.c
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Diffstat (limited to 'drivers/net/usb/r8153_ecm.c')
-rw-r--r--drivers/net/usb/r8153_ecm.c170
1 files changed, 170 insertions, 0 deletions
diff --git a/drivers/net/usb/r8153_ecm.c b/drivers/net/usb/r8153_ecm.c
new file mode 100644
index 000000000..20b2df8d7
--- /dev/null
+++ b/drivers/net/usb/r8153_ecm.c
@@ -0,0 +1,170 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/mii.h>
+#include <linux/usb.h>
+#include <linux/usb/cdc.h>
+#include <linux/usb/usbnet.h>
+#include <linux/usb/r8152.h>
+
+#define OCP_BASE 0xe86c
+
+static int pla_read_word(struct usbnet *dev, u16 index)
+{
+ u16 byen = BYTE_EN_WORD;
+ u8 shift = index & 2;
+ __le32 tmp;
+ int ret;
+
+ if (shift)
+ byen <<= shift;
+
+ index &= ~3;
+
+ ret = usbnet_read_cmd(dev, RTL8152_REQ_GET_REGS, RTL8152_REQT_READ, index,
+ MCU_TYPE_PLA | byen, &tmp, sizeof(tmp));
+ if (ret < 0)
+ goto out;
+
+ ret = __le32_to_cpu(tmp);
+ ret >>= (shift * 8);
+ ret &= 0xffff;
+
+out:
+ return ret;
+}
+
+static int pla_write_word(struct usbnet *dev, u16 index, u32 data)
+{
+ u32 mask = 0xffff;
+ u16 byen = BYTE_EN_WORD;
+ u8 shift = index & 2;
+ __le32 tmp;
+ int ret;
+
+ data &= mask;
+
+ if (shift) {
+ byen <<= shift;
+ mask <<= (shift * 8);
+ data <<= (shift * 8);
+ }
+
+ index &= ~3;
+
+ ret = usbnet_read_cmd(dev, RTL8152_REQ_GET_REGS, RTL8152_REQT_READ, index,
+ MCU_TYPE_PLA | byen, &tmp, sizeof(tmp));
+
+ if (ret < 0)
+ goto out;
+
+ data |= __le32_to_cpu(tmp) & ~mask;
+ tmp = __cpu_to_le32(data);
+
+ ret = usbnet_write_cmd(dev, RTL8152_REQ_SET_REGS, RTL8152_REQT_WRITE, index,
+ MCU_TYPE_PLA | byen, &tmp, sizeof(tmp));
+
+out:
+ return ret;
+}
+
+static int r8153_ecm_mdio_read(struct net_device *netdev, int phy_id, int reg)
+{
+ struct usbnet *dev = netdev_priv(netdev);
+ int ret;
+
+ ret = pla_write_word(dev, OCP_BASE, 0xa000);
+ if (ret < 0)
+ goto out;
+
+ ret = pla_read_word(dev, 0xb400 + reg * 2);
+
+out:
+ return ret;
+}
+
+static void r8153_ecm_mdio_write(struct net_device *netdev, int phy_id, int reg, int val)
+{
+ struct usbnet *dev = netdev_priv(netdev);
+ int ret;
+
+ ret = pla_write_word(dev, OCP_BASE, 0xa000);
+ if (ret < 0)
+ return;
+
+ ret = pla_write_word(dev, 0xb400 + reg * 2, val);
+}
+
+static int r8153_bind(struct usbnet *dev, struct usb_interface *intf)
+{
+ int status;
+
+ status = usbnet_cdc_bind(dev, intf);
+ if (status < 0)
+ return status;
+
+ dev->mii.dev = dev->net;
+ dev->mii.mdio_read = r8153_ecm_mdio_read;
+ dev->mii.mdio_write = r8153_ecm_mdio_write;
+ dev->mii.reg_num_mask = 0x1f;
+ dev->mii.supports_gmii = 1;
+
+ return status;
+}
+
+static const struct driver_info r8153_info = {
+ .description = "RTL8153 ECM Device",
+ .flags = FLAG_ETHER,
+ .bind = r8153_bind,
+ .unbind = usbnet_cdc_unbind,
+ .status = usbnet_cdc_status,
+ .manage_power = usbnet_manage_power,
+};
+
+static const struct usb_device_id products[] = {
+/* Realtek RTL8153 Based USB 3.0 Ethernet Adapters */
+{
+ USB_DEVICE_AND_INTERFACE_INFO(VENDOR_ID_REALTEK, 0x8153, USB_CLASS_COMM,
+ USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
+ .driver_info = (unsigned long)&r8153_info,
+},
+
+/* Lenovo Powered USB-C Travel Hub (4X90S92381, based on Realtek RTL8153) */
+{
+ USB_DEVICE_AND_INTERFACE_INFO(VENDOR_ID_LENOVO, 0x721e, USB_CLASS_COMM,
+ USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
+ .driver_info = (unsigned long)&r8153_info,
+},
+
+ { }, /* END */
+};
+MODULE_DEVICE_TABLE(usb, products);
+
+static int rtl8153_ecm_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+#if IS_REACHABLE(CONFIG_USB_RTL8152)
+ if (rtl8152_get_version(intf))
+ return -ENODEV;
+#endif
+
+ return usbnet_probe(intf, id);
+}
+
+static struct usb_driver r8153_ecm_driver = {
+ .name = "r8153_ecm",
+ .id_table = products,
+ .probe = rtl8153_ecm_probe,
+ .disconnect = usbnet_disconnect,
+ .suspend = usbnet_suspend,
+ .resume = usbnet_resume,
+ .reset_resume = usbnet_resume,
+ .supports_autosuspend = 1,
+ .disable_hub_initiated_lpm = 1,
+};
+
+module_usb_driver(r8153_ecm_driver);
+
+MODULE_AUTHOR("Hayes Wang");
+MODULE_DESCRIPTION("Realtek USB ECM device");
+MODULE_LICENSE("GPL");