r8169: make room for more specific 8168 hardware start procedure

Broadly speaking the 8168c* share some common code which will
be factored in __rtl_hw_start_8168cp. The 8168b* share some
code too but it will be a bit different.

Any change of behavior should be confined to the currently
unidentified 8168 chipsets. They will not be applied the Tx
performance tweak and will emit a warning instead.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Cc: Edward Hsu <edward_hsu@realtek.com.tw>

drivers/net/r8169.c

@@ -1387,7 +1387,7 @@ static void rtl8168cp_hw_phy_config(void __iomem *ioaddr)
 	rtl_phy_write(ioaddr, phy_reg_init, ARRAY_SIZE(phy_reg_init));
 }
 
-static void rtl8168c_hw_phy_config(void __iomem *ioaddr)
+static void rtl8168c_1_hw_phy_config(void __iomem *ioaddr)
 {
 	struct phy_reg phy_reg_init[] = {
 		{ 0x1f, 0x0001 },
@@ -1416,7 +1416,7 @@ static void rtl8168c_hw_phy_config(void __iomem *ioaddr)
 	mdio_write(ioaddr, 0x1f, 0x0000);
 }
 
-static void rtl8168cx_hw_phy_config(void __iomem *ioaddr)
+static void rtl8168c_2_hw_phy_config(void __iomem *ioaddr)
 {
 	struct phy_reg phy_reg_init[] = {
 		{ 0x1f, 0x0001 },
@@ -1495,10 +1495,10 @@ static void rtl_hw_phy_config(struct net_device *dev)
 		rtl8168cp_hw_phy_config(ioaddr);
 		break;
 	case RTL_GIGA_MAC_VER_19:
-		rtl8168c_hw_phy_config(ioaddr);
+		rtl8168c_1_hw_phy_config(ioaddr);
 		break;
 	case RTL_GIGA_MAC_VER_20:
-		rtl8168cx_hw_phy_config(ioaddr);
+		rtl8168c_2_hw_phy_config(ioaddr);
 		break;
 	default:
 		break;
@@ -2384,6 +2384,36 @@ static void rtl_ephy_init(void __iomem *ioaddr, struct ephy_info *e, int len)
 	}
 }
 
+static void rtl_hw_start_8168bb(void __iomem *ioaddr, struct pci_dev *pdev)
+{
+	rtl_tx_performance_tweak(pdev, 0x5 << MAX_READ_REQUEST_SHIFT);
+}
+
+static void rtl_hw_start_8168bef(void __iomem *ioaddr, struct pci_dev *pdev)
+{
+	rtl_hw_start_8168bb(ioaddr, pdev);
+}
+
+static void __rtl_hw_start_8168cp(void __iomem *ioaddr, struct pci_dev *pdev)
+{
+	rtl_tx_performance_tweak(pdev, 0x5 << MAX_READ_REQUEST_SHIFT);
+}
+
+static void rtl_hw_start_8168cp(void __iomem *ioaddr, struct pci_dev *pdev)
+{
+	__rtl_hw_start_8168cp(ioaddr, pdev);
+}
+
+static void rtl_hw_start_8168c_1(void __iomem *ioaddr, struct pci_dev *pdev)
+{
+	__rtl_hw_start_8168cp(ioaddr, pdev);
+}
+
+static void rtl_hw_start_8168c_2(void __iomem *ioaddr, struct pci_dev *pdev)
+{
+	__rtl_hw_start_8168cp(ioaddr, pdev);
+}
+
 static void rtl_hw_start_8168(struct net_device *dev)
 {
 	struct rtl8169_private *tp = netdev_priv(dev);
@@ -2417,7 +2447,33 @@ static void rtl_hw_start_8168(struct net_device *dev)
 
 	RTL_R8(IntrMask);
 
-	rtl_tx_performance_tweak(pdev, 0x5 << MAX_READ_REQUEST_SHIFT);
+	switch (tp->mac_version) {
+	case RTL_GIGA_MAC_VER_11:
+		rtl_hw_start_8168bb(ioaddr, pdev);
+	break;
+
+	case RTL_GIGA_MAC_VER_12:
+	case RTL_GIGA_MAC_VER_17:
+		rtl_hw_start_8168bef(ioaddr, pdev);
+	break;
+
+	case RTL_GIGA_MAC_VER_18:
+		rtl_hw_start_8168cp(ioaddr, pdev);
+	break;
+
+	case RTL_GIGA_MAC_VER_19:
+		rtl_hw_start_8168c_1(ioaddr, pdev);
+	break;
+
+	case RTL_GIGA_MAC_VER_20:
+		rtl_hw_start_8168c_2(ioaddr, pdev);
+	break;
+
+	default:
+		printk(KERN_ERR PFX "%s: unknown chipset (mac_version = %d).\n",
+			dev->name, tp->mac_version);
+	break;
+	}
 
 	RTL_W8(ChipCmd, CmdTxEnb | CmdRxEnb);