drivers/net/usb/r815x.c

   1 #include <linux/module.h>
   2 #include <linux/netdevice.h>
   3 #include <linux/mii.h>
   4 #include <linux/usb.h>
   5 #include <linux/usb/cdc.h>
   6 #include <linux/usb/usbnet.h>
   7
   8 #define RTL815x_REQT_READ       0xc0
   9 #define RTL815x_REQT_WRITE      0x40
  10 #define RTL815x_REQ_GET_REGS    0x05
  11 #define RTL815x_REQ_SET_REGS    0x05
  12
  13 #define MCU_TYPE_PLA            0x0100
  14 #define OCP_BASE                0xe86c
  15 #define BASE_MII                0xa400
  16
  17 #define BYTE_EN_DWORD           0xff
  18 #define BYTE_EN_WORD            0x33
  19 #define BYTE_EN_BYTE            0x11
  20
  21 #define R815x_PHY_ID            32
  22 #define REALTEK_VENDOR_ID       0x0bda
  23
  24
  25 static int pla_read_word(struct usb_device *udev, u16 index)
  26 {
  27         int ret;
  28         u8 shift = index & 2;
  29         __le32 *tmp;
  30
  31         tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
  32         if (!tmp)
  33                 return -ENOMEM;
  34
  35         index &= ~3;
  36
  37         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
  38                               RTL815x_REQ_GET_REGS, RTL815x_REQT_READ,
  39                               index, MCU_TYPE_PLA, tmp, sizeof(*tmp), 500);
  40         if (ret < 0)
  41                 goto out2;
  42
  43         ret = __le32_to_cpu(*tmp);
  44         ret >>= (shift * 8);
  45         ret &= 0xffff;
  46
  47 out2:
  48         kfree(tmp);
  49         return ret;
  50 }
  51
  52 static int pla_write_word(struct usb_device *udev, u16 index, u32 data)
  53 {
  54         __le32 *tmp;
  55         u32 mask = 0xffff;
  56         u16 byen = BYTE_EN_WORD;
  57         u8 shift = index & 2;
  58         int ret;
  59
  60         tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
  61         if (!tmp)
  62                 return -ENOMEM;
  63
  64         data &= mask;
  65
  66         if (shift) {
  67                 byen <<= shift;
  68                 mask <<= (shift * 8);
  69                 data <<= (shift * 8);
  70                 index &= ~3;
  71         }
  72
  73         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
  74                               RTL815x_REQ_GET_REGS, RTL815x_REQT_READ,
  75                               index, MCU_TYPE_PLA, tmp, sizeof(*tmp), 500);
  76         if (ret < 0)
  77                 goto out3;
  78
  79         data |= __le32_to_cpu(*tmp) & ~mask;
  80         *tmp = __cpu_to_le32(data);
  81
  82         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  83                               RTL815x_REQ_SET_REGS, RTL815x_REQT_WRITE,
  84                               index, MCU_TYPE_PLA | byen, tmp, sizeof(*tmp),
  85                               500);
  86
  87 out3:
  88         kfree(tmp);
  89         return ret;
  90 }
  91
  92 static int ocp_reg_read(struct usbnet *dev, u16 addr)
  93 {
  94         u16 ocp_base, ocp_index;
  95         int ret;
  96
  97         ocp_base = addr & 0xf000;
  98         ret = pla_write_word(dev->udev, OCP_BASE, ocp_base);
  99         if (ret < 0)
 100                 goto out;
 101
 102         ocp_index = (addr & 0x0fff) | 0xb000;
 103         ret = pla_read_word(dev->udev, ocp_index);
 104
 105 out:
 106         return ret;
 107 }
 108
 109 static int ocp_reg_write(struct usbnet *dev, u16 addr, u16 data)
 110 {
 111         u16 ocp_base, ocp_index;
 112         int ret;
 113
 114         ocp_base = addr & 0xf000;
 115         ret = pla_write_word(dev->udev, OCP_BASE, ocp_base);
 116         if (ret < 0)
 117                 goto out1;
 118
 119         ocp_index = (addr & 0x0fff) | 0xb000;
 120         ret = pla_write_word(dev->udev, ocp_index, data);
 121
 122 out1:
 123         return ret;
 124 }
 125
 126 static int r815x_mdio_read(struct net_device *netdev, int phy_id, int reg)
 127 {
 128         struct usbnet *dev = netdev_priv(netdev);
 129         int ret;
 130
 131         if (phy_id != R815x_PHY_ID)
 132                 return -EINVAL;
 133
 134         if (usb_autopm_get_interface(dev->intf) < 0)
 135                 return -ENODEV;
 136
 137         ret = ocp_reg_read(dev, BASE_MII + reg * 2);
 138
 139         usb_autopm_put_interface(dev->intf);
 140         return ret;
 141 }
 142
 143 static
 144 void r815x_mdio_write(struct net_device *netdev, int phy_id, int reg, int val)
 145 {
 146         struct usbnet *dev = netdev_priv(netdev);
 147
 148         if (phy_id != R815x_PHY_ID)
 149                 return;
 150
 151         if (usb_autopm_get_interface(dev->intf) < 0)
 152                 return;
 153
 154         ocp_reg_write(dev, BASE_MII + reg * 2, val);
 155
 156         usb_autopm_put_interface(dev->intf);
 157 }
 158
 159 static int r8153_bind(struct usbnet *dev, struct usb_interface *intf)
 160 {
 161         int status;
 162
 163         status = usbnet_cdc_bind(dev, intf);
 164         if (status < 0)
 165                 return status;
 166
 167         dev->mii.dev = dev->net;
 168         dev->mii.mdio_read = r815x_mdio_read;
 169         dev->mii.mdio_write = r815x_mdio_write;
 170         dev->mii.phy_id_mask = 0x3f;
 171         dev->mii.reg_num_mask = 0x1f;
 172         dev->mii.phy_id = R815x_PHY_ID;
 173         dev->mii.supports_gmii = 1;
 174
 175         return status;
 176 }
 177
 178 static int r8152_bind(struct usbnet *dev, struct usb_interface *intf)
 179 {
 180         int status;
 181
 182         status = usbnet_cdc_bind(dev, intf);
 183         if (status < 0)
 184                 return status;
 185
 186         dev->mii.dev = dev->net;
 187         dev->mii.mdio_read = r815x_mdio_read;
 188         dev->mii.mdio_write = r815x_mdio_write;
 189         dev->mii.phy_id_mask = 0x3f;
 190         dev->mii.reg_num_mask = 0x1f;
 191         dev->mii.phy_id = R815x_PHY_ID;
 192         dev->mii.supports_gmii = 0;
 193
 194         return status;
 195 }
 196
 197 static const struct driver_info r8152_info = {
 198         .description =  "RTL8152 ECM Device",
 199         .flags =        FLAG_ETHER | FLAG_POINTTOPOINT,
 200         .bind =         r8152_bind,
 201         .unbind =       usbnet_cdc_unbind,
 202         .status =       usbnet_cdc_status,
 203         .manage_power = usbnet_manage_power,
 204 };
 205
 206 static const struct driver_info r8153_info = {
 207         .description =  "RTL8153 ECM Device",
 208         .flags =        FLAG_ETHER | FLAG_POINTTOPOINT,
 209         .bind =         r8153_bind,
 210         .unbind =       usbnet_cdc_unbind,
 211         .status =       usbnet_cdc_status,
 212         .manage_power = usbnet_manage_power,
 213 };
 214
 215 static const struct usb_device_id products[] = {
 216 {
 217         USB_DEVICE_AND_INTERFACE_INFO(REALTEK_VENDOR_ID, 0x8152, USB_CLASS_COMM,
 218                         USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
 219         .driver_info = (unsigned long) &r8152_info,
 220 },
 221
 222 {
 223         USB_DEVICE_AND_INTERFACE_INFO(REALTEK_VENDOR_ID, 0x8153, USB_CLASS_COMM,
 224                         USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
 225         .driver_info = (unsigned long) &r8153_info,
 226 },
 227
 228         { },            /* END */
 229 };
 230 MODULE_DEVICE_TABLE(usb, products);
 231
 232 static struct usb_driver r815x_driver = {
 233         .name =         "r815x",
 234         .id_table =     products,
 235         .probe =        usbnet_probe,
 236         .disconnect =   usbnet_disconnect,
 237         .suspend =      usbnet_suspend,
 238         .resume =       usbnet_resume,
 239         .reset_resume = usbnet_resume,
 240         .supports_autosuspend = 1,
 241         .disable_hub_initiated_lpm = 1,
 242 };
 243
 244 module_usb_driver(r815x_driver);
 245
 246 MODULE_AUTHOR("Hayes Wang");
 247 MODULE_DESCRIPTION("Realtek USB ECM device");
 248 MODULE_LICENSE("GPL");