tg3: Add clause 45 register accessor methods

This patch adds clause 45 register access methods.  They will be used in
the following patch.

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

drivers/net/tg3.c

@@ -1162,6 +1162,52 @@ static void tg3_mdio_fini(struct tg3 *tp)
 	}
 }
 
+static int tg3_phy_cl45_write(struct tg3 *tp, u32 devad, u32 addr, u32 val)
+{
+	int err;
+
+	err = tg3_writephy(tp, MII_TG3_MMD_CTRL, devad);
+	if (err)
+		goto done;
+
+	err = tg3_writephy(tp, MII_TG3_MMD_ADDRESS, addr);
+	if (err)
+		goto done;
+
+	err = tg3_writephy(tp, MII_TG3_MMD_CTRL,
+			   MII_TG3_MMD_CTRL_DATA_NOINC | devad);
+	if (err)
+		goto done;
+
+	err = tg3_writephy(tp, MII_TG3_MMD_ADDRESS, val);
+
+done:
+	return err;
+}
+
+static int tg3_phy_cl45_read(struct tg3 *tp, u32 devad, u32 addr, u32 *val)
+{
+	int err;
+
+	err = tg3_writephy(tp, MII_TG3_MMD_CTRL, devad);
+	if (err)
+		goto done;
+
+	err = tg3_writephy(tp, MII_TG3_MMD_ADDRESS, addr);
+	if (err)
+		goto done;
+
+	err = tg3_writephy(tp, MII_TG3_MMD_CTRL,
+			   MII_TG3_MMD_CTRL_DATA_NOINC | devad);
+	if (err)
+		goto done;
+
+	err = tg3_readphy(tp, MII_TG3_MMD_ADDRESS, val);
+
+done:
+	return err;
+}
+
 /* tp->lock is held. */
 static inline void tg3_generate_fw_event(struct tg3 *tp)
 {

drivers/net/tg3.h

@@ -2061,6 +2061,10 @@
 #define  MII_TG3_CTRL_AS_MASTER		0x0800
 #define  MII_TG3_CTRL_ENABLE_AS_MASTER	0x1000
 
+#define MII_TG3_MMD_CTRL		0x0d /* MMD Access Control register */
+#define MII_TG3_MMD_CTRL_DATA_NOINC	0x4000
+#define MII_TG3_MMD_ADDRESS		0x0e /* MMD Address Data register */
+
 #define MII_TG3_EXT_CTRL		0x10 /* Extended control register */
 #define  MII_TG3_EXT_CTRL_FIFO_ELASTIC	0x0001
 #define  MII_TG3_EXT_CTRL_LNK3_LED_MODE	0x0002