phy/fixed.c: rework to not duplicate PHY layer functionality

With that patch fixed.c now fully emulates MDIO bus, thus no need
to duplicate PHY layer functionality. That, in turn, drastically
simplifies the code, and drops down line count.

As an additional bonus, now there is no need to register MDIO bus
for each PHY, all emulated PHYs placed on the platform fixed MDIO bus.
There is also no more need to pre-allocate PHYs via .config option,
this is all now handled dynamically.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Vitaly Bordug <vitb@kernel.crashing.org>
Acked-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

drivers/net/phy/Kconfig

@@ -61,34 +61,12 @@ config ICPLUS_PHY
 	  Currently supports the IP175C PHY.
 
 config FIXED_PHY
-	tristate "Drivers for PHY emulation on fixed speed/link"
+	bool "Driver for MDIO Bus/PHY emulation with fixed speed/link PHYs"
 	---help---
-	  Adds the driver to PHY layer to cover the boards that do not have any PHY bound,
-	  but with the ability to manipulate the speed/link in software. The relevant MII
-	  speed/duplex parameters could be effectively handled in a user-specified function.
-	  Currently tested with mpc866ads.
-
-config FIXED_MII_10_FDX
-	bool "Emulation for 10M Fdx fixed PHY behavior"
-	depends on FIXED_PHY
-
-config FIXED_MII_100_FDX
-	bool "Emulation for 100M Fdx fixed PHY behavior"
-	depends on FIXED_PHY
-
-config FIXED_MII_1000_FDX
-	bool "Emulation for 1000M Fdx fixed PHY behavior"
-	depends on FIXED_PHY
-
-config FIXED_MII_AMNT
-        int "Number of emulated PHYs to allocate "
-        depends on FIXED_PHY
-        default "1"
-        ---help---
-        Sometimes it is required to have several independent emulated
-        PHYs on the bus (in case of multi-eth but phy-less HW for instance).
-        This control will have specified number allocated for each fixed
-        PHY type enabled.
+	  Adds the platform "fixed" MDIO Bus to cover the boards that use
+	  PHYs that are not connected to the real MDIO bus.
+
+	  Currently tested with mpc866ads and mpc8349e-mitx.
 
 config MDIO_BITBANG
 	tristate "Support for bitbanged MDIO buses"

include/linux/phy_fixed.h

 #ifndef __PHY_FIXED_H
 #define __PHY_FIXED_H
 
-#define MII_REGS_NUM	29
-
-/* max number of virtual phy stuff */
-#define MAX_PHY_AMNT	10
-/*
-    The idea is to emulate normal phy behavior by responding with
-    pre-defined values to mii BMCR read, so that read_status hook could
-    take all the needed info.
-*/
-
 struct fixed_phy_status {
-	u8 link;
-	u16 speed;
-	u8 duplex;
+	int link;
+	int speed;
+	int duplex;
+	int pause;
+	int asym_pause;
 };
 
-/*-----------------------------------------------------------------------------
- *  Private information hoder for mii_bus
- *-----------------------------------------------------------------------------*/
-struct fixed_info {
-	u16 *regs;
-	u8 regs_num;
-	struct fixed_phy_status phy_status;
-	struct phy_device *phydev;	/* pointer to the container */
-	/* link & speed cb */
-	int (*link_update) (struct net_device *, struct fixed_phy_status *);
+#ifdef CONFIG_FIXED_PHY
+extern int fixed_phy_add(unsigned int irq, int phy_id,
+			 struct fixed_phy_status *status);
+#else
+static inline int fixed_phy_add(unsigned int irq, int phy_id,
+				struct fixed_phy_status *status)
+{
+	return -ENODEV;
+}
+#endif /* CONFIG_FIXED_PHY */
 
-};
-
-
-int fixed_mdio_set_link_update(struct phy_device *,
-       int (*link_update) (struct net_device *, struct fixed_phy_status *));
-struct fixed_info *fixed_mdio_get_phydev (int phydev_ind);
+/*
+ * This function issued only by fixed_phy-aware drivers, no need
+ * protect it with #ifdef
+ */
+extern int fixed_phy_set_link_update(struct phy_device *phydev,
+			int (*link_update)(struct net_device *,
+					   struct fixed_phy_status *));
 
 #endif /* __PHY_FIXED_H */