net: ethernet: fs_enet: phylink conversion

fs_enet is a quite old but still used Ethernet driver found on some NXP
devices. It has support for 10/100 Mbps ethernet, with half and full
duplex. Some variants of it can use RMII, while other integrations are
MII-only.

Add phylink support, thus removing custom fixed-link hanldling.

This also allows removing some internal flags such as the use_rmii flag.
Acked-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/fs_enet/Kconfig

@@ -3,7 +3,7 @@ config FS_ENET
 	tristate "Freescale Ethernet Driver"
 	depends on NET_VENDOR_FREESCALE && (CPM1 || CPM2 || PPC_MPC512x)
 	select MII
-	select PHYLIB
+	select PHYLINK
 
 config FS_ENET_MPC5121_FEC
 	def_bool y if (FS_ENET && PPC_MPC512x)

drivers/net/ethernet/freescale/fs_enet/fs_enet.h

@@ -7,6 +7,7 @@
 #include <linux/types.h>
 #include <linux/list.h>
 #include <linux/phy.h>
+#include <linux/phylink.h>
 #include <linux/dma-mapping.h>
 
 #ifdef CONFIG_CPM1
@@ -76,7 +77,8 @@ struct fs_ops {
 	void (*free_bd)(struct net_device *dev);
 	void (*cleanup_data)(struct net_device *dev);
 	void (*set_multicast_list)(struct net_device *dev);
-	void (*restart)(struct net_device *dev);
+	void (*restart)(struct net_device *dev, phy_interface_t interface,
+			int speed, int duplex);
 	void (*stop)(struct net_device *dev);
 	void (*napi_clear_event)(struct net_device *dev);
 	void (*napi_enable)(struct net_device *dev);
@@ -112,13 +114,9 @@ struct fs_platform_info {
 
 	u32 dpram_offset;
 
-	struct device_node *phy_node;
-
 	int rx_ring, tx_ring;	/* number of buffers on rx	*/
 	int rx_copybreak;	/* limit we copy small frames	*/
 	int napi_weight;	/* NAPI weight			*/
-
-	int use_rmii;		/* use RMII mode		*/
 };
 
 struct fs_enet_private {
@@ -143,10 +141,10 @@ struct fs_enet_private {
 	cbd_t __iomem *cur_tx;
 	int tx_free;
 	u32 msg_enable;
+	struct phylink *phylink;
+	struct phylink_config phylink_config;
 	int interrupt;
 
-	int oldduplex, oldspeed, oldlink;	/* current settings */
-
 	/* event masks */
 	u32 ev_napi;		/* mask of NAPI events */
 	u32 ev;			/* event mask          */

drivers/net/ethernet/freescale/fs_enet/mac-fcc.c

@@ -235,7 +235,8 @@ static void set_multicast_list(struct net_device *dev)
 		set_promiscuous_mode(dev);
 }
 
-static void restart(struct net_device *dev)
+static void restart(struct net_device *dev, phy_interface_t interface,
+		    int speed, int duplex)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);
 	const struct fs_platform_info *fpi = fep->fpi;
@@ -359,8 +360,8 @@ static void restart(struct net_device *dev)
 	fs_init_bds(dev);
 
 	/* adjust to speed (for RMII mode) */
-	if (fpi->use_rmii) {
-		if (dev->phydev->speed == SPEED_100)
+	if (interface == PHY_INTERFACE_MODE_RMII) {
+		if (speed == SPEED_100)
 			C8(fcccp, fcc_gfemr, 0x20);
 		else
 			S8(fcccp, fcc_gfemr, 0x20);
@@ -382,11 +383,11 @@ static void restart(struct net_device *dev)
 
 	W32(fccp, fcc_fpsmr, FCC_PSMR_ENCRC);
 
-	if (fpi->use_rmii)
+	if (interface == PHY_INTERFACE_MODE_RMII)
 		S32(fccp, fcc_fpsmr, FCC_PSMR_RMII);
 
 	/* adjust to duplex mode */
-	if (dev->phydev->duplex == DUPLEX_FULL)
+	if (duplex == DUPLEX_FULL)
 		S32(fccp, fcc_fpsmr, FCC_PSMR_FDE | FCC_PSMR_LPB);
 	else
 		C32(fccp, fcc_fpsmr, FCC_PSMR_FDE | FCC_PSMR_LPB);

drivers/net/ethernet/freescale/fs_enet/mac-fec.c

@@ -220,7 +220,8 @@ static void set_multicast_list(struct net_device *dev)
 		set_promiscuous_mode(dev);
 }
 
-static void restart(struct net_device *dev)
+static void restart(struct net_device *dev, phy_interface_t interface,
+		    int speed, int duplex)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);
 	struct fec __iomem *fecp = fep->fec.fecp;
@@ -302,13 +303,13 @@ static void restart(struct net_device *dev)
 	 * Only set MII/RMII mode - do not touch maximum frame length
 	 * configured before.
 	 */
-	FS(fecp, r_cntrl, fpi->use_rmii ?
-			FEC_RCNTRL_RMII_MODE : FEC_RCNTRL_MII_MODE);
+	FS(fecp, r_cntrl, interface == PHY_INTERFACE_MODE_RMII ?
+			  FEC_RCNTRL_RMII_MODE : FEC_RCNTRL_MII_MODE);
 #endif
 	/*
 	 * adjust to duplex mode
 	 */
-	if (dev->phydev->duplex == DUPLEX_FULL) {
+	if (duplex == DUPLEX_FULL) {
 		FC(fecp, r_cntrl, FEC_RCNTRL_DRT);
 		FS(fecp, x_cntrl, FEC_TCNTRL_FDEN);	/* FD enable */
 	} else {

drivers/net/ethernet/freescale/fs_enet/mac-scc.c

@@ -226,7 +226,8 @@ static void set_multicast_list(struct net_device *dev)
  * change.  This only happens when switching between half and full
  * duplex.
  */
-static void restart(struct net_device *dev)
+static void restart(struct net_device *dev, phy_interface_t interface,
+		    int speed, int duplex)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);
 	scc_t __iomem *sccp = fep->scc.sccp;
@@ -337,7 +338,7 @@ static void restart(struct net_device *dev)
 	W16(sccp, scc_psmr, SCC_PSMR_ENCRC | SCC_PSMR_NIB22);
 
 	/* Set full duplex mode if needed */
-	if (dev->phydev->duplex == DUPLEX_FULL)
+	if (duplex == DUPLEX_FULL)
 		S16(sccp, scc_psmr, SCC_PSMR_LPB | SCC_PSMR_FDE);
 
 	/* Restore multicast and promiscuous settings */