net/usb: add relative mii functions for r815x

Base on cdc_ether, add the mii functions for RTL8152 and RTL8153.
The RTL8152 and RTL8153 support ECM mode which use the driver of
cdc_ether. Add the mii functions. Then, the basic PHY access is
possible.

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 239 insertions, 3 deletions

diff --git a/drivers/net/usb/Makefile b/drivers/net/usb/Makefile
index 9ab5c9d4b45a..e8171784529d 100644
--- a/drivers/net/usb/Makefile
+++ b/drivers/net/usb/Makefile
@@ -11,7 +11,7 @@ obj-$(CONFIG_USB_HSO)		+= hso.o
 obj-$(CONFIG_USB_NET_AX8817X)   += asix.o
 asix-y := asix_devices.o asix_common.o ax88172a.o
 obj-$(CONFIG_USB_NET_AX88179_178A)      += ax88179_178a.o
-obj-$(CONFIG_USB_NET_CDCETHER)  += cdc_ether.o
+obj-$(CONFIG_USB_NET_CDCETHER)  += cdc_ether.o r815x.o
 obj-$(CONFIG_USB_NET_CDC_EEM)   += cdc_eem.o
 obj-$(CONFIG_USB_NET_DM9601)    += dm9601.o
 obj-$(CONFIG_USB_NET_SMSC75XX)  += smsc75xx.o
diff --git a/drivers/net/usb/cdc_ether.c b/drivers/net/usb/cdc_ether.c
index 4393f1483126..03ad4dc293aa 100644
--- a/drivers/net/usb/cdc_ether.c
+++ b/drivers/net/usb/cdc_ether.c
@@ -646,13 +646,18 @@ static const struct usb_device_id	products [] = {
 },
 
 /* Realtek RTL8152 Based USB 2.0 Ethernet Adapters */
-#if defined(CONFIG_USB_RTL8152) || defined(CONFIG_USB_RTL8152_MODULE)
 {
         USB_DEVICE_AND_INTERFACE_INFO(REALTEK_VENDOR_ID, 0x8152, USB_CLASS_COMM,
                         USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
         .driver_info = 0,
 },
-#endif
+
+/* Realtek RTL8153 Based USB 3.0 Ethernet Adapters */
+{
+        USB_DEVICE_AND_INTERFACE_INFO(REALTEK_VENDOR_ID, 0x8153, USB_CLASS_COMM,
+                        USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
+        .driver_info = 0,
+},
 
 /*
  * WHITELIST!!!
diff --git a/drivers/net/usb/r815x.c b/drivers/net/usb/r815x.c
new file mode 100644
index 000000000000..65167377ff09
--- /dev/null
+++ b/drivers/net/usb/r815x.c
@@ -0,0 +1,231 @@
+#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>
+
+#define RTL815x_REQT_READ       0xc0
+#define RTL815x_REQT_WRITE      0x40
+#define RTL815x_REQ_GET_REGS    0x05
+#define RTL815x_REQ_SET_REGS    0x05
+
+#define MCU_TYPE_PLA            0x0100
+#define OCP_BASE                0xe86c
+#define BASE_MII                0xa400
+
+#define BYTE_EN_DWORD           0xff
+#define BYTE_EN_WORD            0x33
+#define BYTE_EN_BYTE            0x11
+
+#define R815x_PHY_ID            32
+#define REALTEK_VENDOR_ID       0x0bda
+
+
+static int pla_read_word(struct usb_device *udev, u16 index)
+{
+        int data, ret;
+        u8 shift = index & 2;
+
+        index &= ~3;
+
+        ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
+                              RTL815x_REQ_GET_REGS, RTL815x_REQT_READ,
+                              index, MCU_TYPE_PLA, &data, sizeof(data), 500);
+        if (ret < 0)
+                return ret;
+
+        data = __le32_to_cpu(data);
+        data >>= (shift * 8);
+        data &= 0xffff;
+
+        return data;
+}
+
+static int pla_write_word(struct usb_device *udev, u16 index, u32 data)
+{
+        u32 tmp, mask = 0xffff;
+        u16 byen = BYTE_EN_WORD;
+        u8 shift = index & 2;
+        int ret;
+
+        data &= mask;
+
+        if (shift) {
+                byen <<= shift;
+                mask <<= (shift * 8);
+                data <<= (shift * 8);
+                index &= ~3;
+        }
+
+        ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
+                              RTL815x_REQ_GET_REGS, RTL815x_REQT_READ,
+                              index, MCU_TYPE_PLA, &tmp, sizeof(tmp), 500);
+        if (ret < 0)
+                return ret;
+
+        tmp = __le32_to_cpu(tmp) & ~mask;
+        tmp |= data;
+        tmp = __cpu_to_le32(tmp);
+
+        ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+                              RTL815x_REQ_SET_REGS, RTL815x_REQT_WRITE,
+                              index, MCU_TYPE_PLA | byen, &tmp,
+                              sizeof(tmp), 500);
+
+        return ret;
+}
+
+static int ocp_reg_read(struct usbnet *dev, u16 addr)
+{
+        u16 ocp_base, ocp_index;
+        int ret;
+
+        ocp_base = addr & 0xf000;
+        ret = pla_write_word(dev->udev, OCP_BASE, ocp_base);
+        if (ret < 0)
+                goto out;
+
+        ocp_index = (addr & 0x0fff) | 0xb000;
+        ret = pla_read_word(dev->udev, ocp_index);
+
+out:
+        return ret;
+}
+
+static int ocp_reg_write(struct usbnet *dev, u16 addr, u16 data)
+{
+        u16 ocp_base, ocp_index;
+        int ret;
+
+        ocp_base = addr & 0xf000;
+        ret = pla_write_word(dev->udev, OCP_BASE, ocp_base);
+        if (ret < 0)
+                goto out1;
+
+        ocp_index = (addr & 0x0fff) | 0xb000;
+        ret = pla_write_word(dev->udev, ocp_index, data);
+
+out1:
+        return ret;
+}
+
+static int r815x_mdio_read(struct net_device *netdev, int phy_id, int reg)
+{
+        struct usbnet *dev = netdev_priv(netdev);
+
+        if (phy_id != R815x_PHY_ID)
+                return -EINVAL;
+
+        return ocp_reg_read(dev, BASE_MII + reg * 2);
+}
+
+static
+void r815x_mdio_write(struct net_device *netdev, int phy_id, int reg, int val)
+{
+        struct usbnet *dev = netdev_priv(netdev);
+
+        if (phy_id != R815x_PHY_ID)
+                return;
+
+        ocp_reg_write(dev, BASE_MII + 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 = r815x_mdio_read;
+        dev->mii.mdio_write = r815x_mdio_write;
+        dev->mii.phy_id_mask = 0x3f;
+        dev->mii.reg_num_mask = 0x1f;
+        dev->mii.phy_id = R815x_PHY_ID;
+        dev->mii.supports_gmii = 1;
+
+        return 0;
+}
+
+static int r8152_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 = r815x_mdio_read;
+        dev->mii.mdio_write = r815x_mdio_write;
+        dev->mii.phy_id_mask = 0x3f;
+        dev->mii.reg_num_mask = 0x1f;
+        dev->mii.phy_id = R815x_PHY_ID;
+        dev->mii.supports_gmii = 0;
+
+        return 0;
+}
+
+static const struct driver_info r8152_info = {
+        .description =  "RTL8152 ECM Device",
+        .flags =        FLAG_ETHER | FLAG_POINTTOPOINT,
+        .bind =         r8152_bind,
+        .unbind =       usbnet_cdc_unbind,
+        .status =       usbnet_cdc_status,
+        .manage_power = usbnet_manage_power,
+};
+
+static const struct driver_info r8153_info = {
+        .description =  "RTL8153 ECM Device",
+        .flags =        FLAG_ETHER | FLAG_POINTTOPOINT,
+        .bind =         r8153_bind,
+        .unbind =       usbnet_cdc_unbind,
+        .status =       usbnet_cdc_status,
+        .manage_power = usbnet_manage_power,
+};
+
+static const struct usb_device_id products[] = {
+{
+        USB_DEVICE_AND_INTERFACE_INFO(REALTEK_VENDOR_ID, 0x8152, USB_CLASS_COMM,
+                        USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
+#if defined(CONFIG_USB_RTL8152) || defined(CONFIG_USB_RTL8152_MODULE)
+        .driver_info = 0,
+#else
+        .driver_info = (unsigned long) &r8152_info,
+#endif
+},
+
+{
+        USB_DEVICE_AND_INTERFACE_INFO(REALTEK_VENDOR_ID, 0x8153, USB_CLASS_COMM,
+                        USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
+#if defined(CONFIG_USB_RTL8153) || defined(CONFIG_USB_RTL8153_MODULE)
+        .driver_info = 0,
+#else
+        .driver_info = (unsigned long) &r8153_info,
+#endif
+},
+
+        { },            /* END */
+};
+MODULE_DEVICE_TABLE(usb, products);
+
+static struct usb_driver r815x_driver = {
+        .name =         "r815x",
+        .id_table =     products,
+        .probe =        usbnet_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(r815x_driver);
+
+MODULE_AUTHOR("Hayes Wang");
+MODULE_DESCRIPTION("Realtek USB ECM device");
+MODULE_LICENSE("GPL");