[TG3]: Enable auto MDI.

This patch adds automatic MDI crossover support when autonegotiation is
turned off.  Automatic MDI crossover allows link to be established
without the use of a crossover cable.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 1df129a..4f59e5c 100644 (file)
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -721,6 +721,44 @@ static int tg3_writephy(struct tg3 *tp, int reg, u32 val)
        return ret;
 }
 
+static void tg3_phy_toggle_automdix(struct tg3 *tp, int enable)
+{
+       u32 phy;
+
+       if (!(tp->tg3_flags2 & TG3_FLG2_5705_PLUS) ||
+           (tp->tg3_flags2 & TG3_FLG2_ANY_SERDES))
+               return;
+
+       if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5906) {
+               u32 ephy;
+
+               if (!tg3_readphy(tp, MII_TG3_EPHY_TEST, &ephy)) {
+                       tg3_writephy(tp, MII_TG3_EPHY_TEST,
+                                    ephy | MII_TG3_EPHY_SHADOW_EN);
+                       if (!tg3_readphy(tp, MII_TG3_EPHYTST_MISCCTRL, &phy)) {
+                               if (enable)
+                                       phy |= MII_TG3_EPHYTST_MISCCTRL_MDIX;
+                               else
+                                       phy &= ~MII_TG3_EPHYTST_MISCCTRL_MDIX;
+                               tg3_writephy(tp, MII_TG3_EPHYTST_MISCCTRL, phy);
+                       }
+                       tg3_writephy(tp, MII_TG3_EPHY_TEST, ephy);
+               }
+       } else {
+               phy = MII_TG3_AUXCTL_MISC_RDSEL_MISC |
+                     MII_TG3_AUXCTL_SHDWSEL_MISC;
+               if (!tg3_writephy(tp, MII_TG3_AUX_CTRL, phy) &&
+                   !tg3_readphy(tp, MII_TG3_AUX_CTRL, &phy)) {
+                       if (enable)
+                               phy |= MII_TG3_AUXCTL_MISC_FORCE_AMDIX;
+                       else
+                               phy &= ~MII_TG3_AUXCTL_MISC_FORCE_AMDIX;
+                       phy |= MII_TG3_AUXCTL_MISC_WREN;
+                       tg3_writephy(tp, MII_TG3_AUX_CTRL, phy);
+               }
+       }
+}
+
 static void tg3_phy_set_wirespeed(struct tg3 *tp)
 {
        u32 val;
@@ -1045,23 +1083,11 @@ out:
        }
 
        if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5906) {
-               u32 phy_reg;
-
                /* adjust output voltage */
                tg3_writephy(tp, MII_TG3_EPHY_PTEST, 0x12);
-
-               if (!tg3_readphy(tp, MII_TG3_EPHY_TEST, &phy_reg)) {
-                       u32 phy_reg2;
-
-                       tg3_writephy(tp, MII_TG3_EPHY_TEST,
-                                    phy_reg | MII_TG3_EPHY_SHADOW_EN);
-                       /* Enable auto-MDIX */
-                       if (!tg3_readphy(tp, 0x10, &phy_reg2))
-                               tg3_writephy(tp, 0x10, phy_reg2 | 0x4000);
-                       tg3_writephy(tp, MII_TG3_EPHY_TEST, phy_reg);
-               }
        }
 
+       tg3_phy_toggle_automdix(tp, 1);
        tg3_phy_set_wirespeed(tp);
        return 0;
 }
@@ -8847,14 +8873,14 @@ static int tg3_run_loopback(struct tg3 *tp, int loopback_mode)
                                             phytest | MII_TG3_EPHY_SHADOW_EN);
                                if (!tg3_readphy(tp, 0x1b, &phy))
                                        tg3_writephy(tp, 0x1b, phy & ~0x20);
-                               if (!tg3_readphy(tp, 0x10, &phy))
-                                       tg3_writephy(tp, 0x10, phy & ~0x4000);
                                tg3_writephy(tp, MII_TG3_EPHY_TEST, phytest);
                        }
                        val = BMCR_LOOPBACK | BMCR_FULLDPLX | BMCR_SPEED100;
                } else
                        val = BMCR_LOOPBACK | BMCR_FULLDPLX | BMCR_SPEED1000;
 
+               tg3_phy_toggle_automdix(tp, 0);
+
                tg3_writephy(tp, MII_BMCR, val);
                udelay(40);
 

diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index bd9f4f4..e1b9381 100644 (file)
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -1642,6 +1642,11 @@
 
 #define MII_TG3_AUX_CTRL               0x18 /* auxilliary control register */
 
+#define MII_TG3_AUXCTL_MISC_WREN       0x8000
+#define MII_TG3_AUXCTL_MISC_FORCE_AMDIX        0x0200
+#define MII_TG3_AUXCTL_MISC_RDSEL_MISC 0x7000
+#define MII_TG3_AUXCTL_SHDWSEL_MISC            0x0007
+
 #define MII_TG3_AUX_STAT               0x19 /* auxilliary status register */
 #define MII_TG3_AUX_STAT_LPASS         0x0004
 #define MII_TG3_AUX_STAT_SPDMASK       0x0700
@@ -1667,6 +1672,9 @@
 #define MII_TG3_EPHY_TEST              0x1f /* 5906 PHY register */
 #define MII_TG3_EPHY_SHADOW_EN         0x80
 
+#define MII_TG3_EPHYTST_MISCCTRL       0x10 /* 5906 EPHY misc ctrl shadow register */
+#define MII_TG3_EPHYTST_MISCCTRL_MDIX  0x4000
+
 #define MII_TG3_TEST1                  0x1e
 #define MII_TG3_TEST1_TRIM_EN          0x0010
 #define MII_TG3_TEST1_CRC_EN           0x8000