[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>

2 files changed, 49 insertions, 15 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 1df129aa3299..4f59e5c10c46 100644
--- 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 bd9f4f428e5b..e1b9381d3b41 100644
--- 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