phy: add support for ET1011C phys

Adds an ET1011C PHY driver which is derived from the
Linux kernel PHY driver (drivers/net/phy/et1011c.c)
from the v3.9-rc2 tag. Note that an errata workaround
config option is implemented to allow for TX_CLK to be
enabled even when gigabit mode is negotiated. This
workaround is used on the PG1.0 TI814X EVM.

Signed-off-by: Matt Porter <mporter@ti.com>
Reviewed-by: Tom Rini <trini@ti.com>

drivers/net/phy/Makefile

@@ -34,6 +34,7 @@ COBJS-$(CONFIG_PHYLIB_10G) += generic_10g.o
 COBJS-$(CONFIG_PHY_ATHEROS) += atheros.o
 COBJS-$(CONFIG_PHY_BROADCOM) += broadcom.o
 COBJS-$(CONFIG_PHY_DAVICOM) += davicom.o
+COBJS-$(CONFIG_PHY_ET1011C) += et1011c.o
 COBJS-$(CONFIG_PHY_LXT) += lxt.o
 COBJS-$(CONFIG_PHY_MARVELL) += marvell.o
 COBJS-$(CONFIG_PHY_MICREL) += micrel.o

drivers/net/phy/et1011c.c

@@ -0,0 +1,110 @@
+/*
+ * ET1011C PHY driver
+ *
+ * Derived from Linux kernel driver by Chaithrika U S
+ * Copyright (C) 2013, Texas Instruments, Incorporated - http://www.ti.com/
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <config.h>
+#include <phy.h>
+
+#define ET1011C_CONFIG_REG		(0x16)
+#define ET1011C_TX_FIFO_MASK		(0x3 << 12)
+#define ET1011C_TX_FIFO_DEPTH_8		(0x0 << 12)
+#define ET1011C_TX_FIFO_DEPTH_16	(0x1 << 12)
+#define ET1011C_INTERFACE_MASK		(0x7 << 0)
+#define ET1011C_GMII_INTERFACE		(0x2 << 0)
+#define ET1011C_SYS_CLK_EN		(0x1 << 4)
+#define ET1011C_TX_CLK_EN		(0x1 << 5)
+
+#define ET1011C_STATUS_REG		(0x1A)
+#define ET1011C_DUPLEX_STATUS		(0x1 << 7)
+#define ET1011C_SPEED_MASK		(0x3 << 8)
+#define ET1011C_SPEED_1000		(0x2 << 8)
+#define ET1011C_SPEED_100		(0x1 << 8)
+#define ET1011C_SPEED_10		(0x0 << 8)
+
+static int et1011c_config(struct phy_device *phydev)
+{
+	int ctl = 0;
+	ctl = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
+	if (ctl < 0)
+		return ctl;
+	ctl &= ~(BMCR_FULLDPLX | BMCR_SPEED100 | BMCR_SPEED1000 |
+		 BMCR_ANENABLE);
+	/* First clear the PHY */
+	phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, ctl | BMCR_RESET);
+
+	return genphy_config_aneg(phydev);
+}
+
+static int et1011c_parse_status(struct phy_device *phydev)
+{
+	int mii_reg;
+	int speed;
+
+	mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, ET1011C_STATUS_REG);
+
+	if (mii_reg & ET1011C_DUPLEX_STATUS)
+		phydev->duplex = DUPLEX_FULL;
+	else
+		phydev->duplex = DUPLEX_HALF;
+
+	speed = mii_reg & ET1011C_SPEED_MASK;
+	switch (speed) {
+	case ET1011C_SPEED_1000:
+		phydev->speed = SPEED_1000;
+		mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, ET1011C_CONFIG_REG);
+		mii_reg &= ~ET1011C_TX_FIFO_MASK;
+		phy_write(phydev, MDIO_DEVAD_NONE, ET1011C_CONFIG_REG,
+			  mii_reg |
+			  ET1011C_GMII_INTERFACE |
+			  ET1011C_SYS_CLK_EN |
+#ifdef CONFIG_PHY_ET1011C_TX_CLK_FIX
+			  ET1011C_TX_CLK_EN |
+#endif
+			  ET1011C_TX_FIFO_DEPTH_16);
+		break;
+	case ET1011C_SPEED_100:
+		phydev->speed = SPEED_100;
+		break;
+	case ET1011C_SPEED_10:
+		phydev->speed = SPEED_10;
+		break;
+	}
+
+	return 0;
+}
+
+static int et1011c_startup(struct phy_device *phydev)
+{
+	genphy_update_link(phydev);
+	et1011c_parse_status(phydev);
+	return 0;
+}
+
+static struct phy_driver et1011c_driver = {
+	.name		= "ET1011C",
+	.uid		= 0x0282f014,
+	.mask		= 0xfffffff0,
+	.features	= PHY_GBIT_FEATURES,
+	.config		= &et1011c_config,
+	.startup	= &et1011c_startup,
+};
+
+int phy_et1011c_init(void)
+{
+	phy_register(&et1011c_driver);
+
+	return 0;
+}

drivers/net/phy/phy.c

@@ -430,6 +430,9 @@ int phy_init(void)
 #ifdef CONFIG_PHY_DAVICOM
 	phy_davicom_init();
 #endif
+#ifdef CONFIG_PHY_ET1011C
+	phy_et1011c_init();
+#endif
 #ifdef CONFIG_PHY_LXT
 	phy_lxt_init();
 #endif

include/phy.h

@@ -223,6 +223,7 @@ int gen10g_discover_mmds(struct phy_device *phydev);
 int phy_atheros_init(void);
 int phy_broadcom_init(void);
 int phy_davicom_init(void);
+int phy_et1011c_init(void);
 int phy_lxt_init(void);
 int phy_marvell_init(void);
 int phy_micrel_init(void);