net: phy: Add PHY driver for mv88e61xx switches

The previous mv88e61xx driver was a driver for configuring the
switch, but did not integrate with the PHY/networking system, so
it could not be used as a PHY by U-boot.  This is a complete
rework to support this device as a PHY.

Signed-off-by: Kevin Smith <kevin.smith@elecsyscorp.com>
Acked-by: Prafulla Wadaskar <prafulla@marvell.com>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Marek Vasut <marex@denx.de>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

drivers/net/phy/mv88e61xx.c

@@ -0,0 +1,1017 @@
+/*
+ * (C) Copyright 2015
+ * Elecsys Corporation <www.elecsyscorp.com>
+ * Kevin Smith <kevin.smith@elecsyscorp.com>
+ *
+ * Original driver:
+ * (C) Copyright 2009
+ * Marvell Semiconductor <www.marvell.com>
+ * Prafulla Wadaskar <prafulla@marvell.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/*
+ * PHY driver for mv88e61xx ethernet switches.
+ *
+ * This driver configures the mv88e61xx for basic use as a PHY.  The switch
+ * supports a VLAN configuration that determines how traffic will be routed
+ * between the ports.  This driver uses a simple configuration that routes
+ * traffic from each PHY port only to the CPU port, and from the CPU port to
+ * any PHY port.
+ *
+ * The configuration determines which PHY ports to activate using the
+ * CONFIG_MV88E61XX_PHY_PORTS bitmask.  Setting bit 0 will activate port 0, bit
+ * 1 activates port 1, etc.  Do not set the bit for the port the CPU is
+ * connected to unless it is connected over a PHY interface (not MII).
+ *
+ * This driver was written for and tested on the mv88e6176 with an SGMII
+ * connection.  Other configurations should be supported, but some additions or
+ * changes may be required.
+ */
+
+#include <common.h>
+
+#include <bitfield.h>
+#include <errno.h>
+#include <malloc.h>
+#include <miiphy.h>
+#include <netdev.h>
+
+#define PHY_AUTONEGOTIATE_TIMEOUT	5000
+
+#define PORT_COUNT			7
+#define PORT_MASK			((1 << PORT_COUNT) - 1)
+
+/* Device addresses */
+#define DEVADDR_PHY(p)			(p)
+#define DEVADDR_PORT(p)			(0x10 + (p))
+#define DEVADDR_SERDES			0x0F
+#define DEVADDR_GLOBAL_1		0x1B
+#define DEVADDR_GLOBAL_2		0x1C
+
+/* SMI indirection registers for multichip addressing mode */
+#define SMI_CMD_REG			0x00
+#define SMI_DATA_REG			0x01
+
+/* Global registers */
+#define GLOBAL1_STATUS			0x00
+#define GLOBAL1_CTRL			0x04
+#define GLOBAL1_MON_CTRL		0x1A
+
+/* Global 2 registers */
+#define GLOBAL2_REG_PHY_CMD		0x18
+#define GLOBAL2_REG_PHY_DATA		0x19
+
+/* Port registers */
+#define PORT_REG_STATUS			0x00
+#define PORT_REG_PHYS_CTRL		0x01
+#define PORT_REG_SWITCH_ID		0x03
+#define PORT_REG_CTRL			0x04
+#define PORT_REG_VLAN_MAP		0x06
+#define PORT_REG_VLAN_ID		0x07
+
+/* Phy registers */
+#define PHY_REG_CTRL1			0x10
+#define PHY_REG_STATUS1			0x11
+#define PHY_REG_PAGE			0x16
+
+/* Serdes registers */
+#define SERDES_REG_CTRL_1		0x10
+
+/* Phy page numbers */
+#define PHY_PAGE_COPPER			0
+#define PHY_PAGE_SERDES			1
+
+/* Register fields */
+#define GLOBAL1_CTRL_SWRESET		BIT(15)
+
+#define GLOBAL1_MON_CTRL_CPUDEST_SHIFT	4
+#define GLOBAL1_MON_CTRL_CPUDEST_WIDTH	4
+
+#define PORT_REG_STATUS_LINK		BIT(11)
+#define PORT_REG_STATUS_DUPLEX		BIT(10)
+
+#define PORT_REG_STATUS_SPEED_SHIFT	8
+#define PORT_REG_STATUS_SPEED_WIDTH	2
+#define PORT_REG_STATUS_SPEED_10	0
+#define PORT_REG_STATUS_SPEED_100	1
+#define PORT_REG_STATUS_SPEED_1000	2
+
+#define PORT_REG_STATUS_CMODE_MASK		0xF
+#define PORT_REG_STATUS_CMODE_100BASE_X		0x8
+#define PORT_REG_STATUS_CMODE_1000BASE_X	0x9
+#define PORT_REG_STATUS_CMODE_SGMII		0xa
+
+#define PORT_REG_PHYS_CTRL_LINK_VALUE	BIT(5)
+#define PORT_REG_PHYS_CTRL_LINK_FORCE	BIT(4)
+
+#define PORT_REG_CTRL_PSTATE_SHIFT	0
+#define PORT_REG_CTRL_PSTATE_WIDTH	2
+
+#define PORT_REG_VLAN_ID_DEF_VID_SHIFT	0
+#define PORT_REG_VLAN_ID_DEF_VID_WIDTH	12
+
+#define PORT_REG_VLAN_MAP_TABLE_SHIFT	0
+#define PORT_REG_VLAN_MAP_TABLE_WIDTH	11
+
+#define SERDES_REG_CTRL_1_FORCE_LINK	BIT(10)
+
+#define PHY_REG_CTRL1_ENERGY_DET_SHIFT	8
+#define PHY_REG_CTRL1_ENERGY_DET_WIDTH	2
+
+/* Field values */
+#define PORT_REG_CTRL_PSTATE_DISABLED	0
+#define PORT_REG_CTRL_PSTATE_FORWARD	3
+
+#define PHY_REG_CTRL1_ENERGY_DET_OFF	0
+#define PHY_REG_CTRL1_ENERGY_DET_SENSE_ONLY	2
+#define PHY_REG_CTRL1_ENERGY_DET_SENSE_XMIT	3
+
+/* PHY Status Register */
+#define PHY_REG_STATUS1_SPEED		0xc000
+#define PHY_REG_STATUS1_GBIT		0x8000
+#define PHY_REG_STATUS1_100		0x4000
+#define PHY_REG_STATUS1_DUPLEX		0x2000
+#define PHY_REG_STATUS1_SPDDONE		0x0800
+#define PHY_REG_STATUS1_LINK		0x0400
+#define PHY_REG_STATUS1_ENERGY		0x0010
+
+/*
+ * Macros for building commands for indirect addressing modes.  These are valid
+ * for both the indirect multichip addressing mode and the PHY indirection
+ * required for the writes to any PHY register.
+ */
+#define SMI_BUSY			BIT(15)
+#define SMI_CMD_CLAUSE_22		BIT(12)
+#define SMI_CMD_CLAUSE_22_OP_READ	(2 << 10)
+#define SMI_CMD_CLAUSE_22_OP_WRITE	(1 << 10)
+
+#define SMI_CMD_READ			(SMI_BUSY | SMI_CMD_CLAUSE_22 | \
+					 SMI_CMD_CLAUSE_22_OP_READ)
+#define SMI_CMD_WRITE			(SMI_BUSY | SMI_CMD_CLAUSE_22 | \
+					 SMI_CMD_CLAUSE_22_OP_WRITE)
+
+#define SMI_CMD_ADDR_SHIFT		5
+#define SMI_CMD_ADDR_WIDTH		5
+#define SMI_CMD_REG_SHIFT		0
+#define SMI_CMD_REG_WIDTH		5
+
+/* Check for required macros */
+#ifndef CONFIG_MV88E61XX_PHY_PORTS
+#error Define CONFIG_MV88E61XX_PHY_PORTS to indicate which physical ports \
+	to activate
+#endif
+#ifndef CONFIG_MV88E61XX_CPU_PORT
+#error Define CONFIG_MV88E61XX_CPU_PORT to the port the CPU is attached to
+#endif
+
+/* ID register values for different switch models */
+#define PORT_SWITCH_ID_6172		0x1720
+#define PORT_SWITCH_ID_6176		0x1760
+#define PORT_SWITCH_ID_6240		0x2400
+#define PORT_SWITCH_ID_6352		0x3520
+
+struct mv88e61xx_phy_priv {
+	struct mii_dev *mdio_bus;
+	int smi_addr;
+	int id;
+};
+
+static inline int smi_cmd(int cmd, int addr, int reg)
+{
+	cmd = bitfield_replace(cmd, SMI_CMD_ADDR_SHIFT, SMI_CMD_ADDR_WIDTH,
+			       addr);
+	cmd = bitfield_replace(cmd, SMI_CMD_REG_SHIFT, SMI_CMD_REG_WIDTH, reg);
+	return cmd;
+}
+
+static inline int smi_cmd_read(int addr, int reg)
+{
+	return smi_cmd(SMI_CMD_READ, addr, reg);
+}
+
+static inline int smi_cmd_write(int addr, int reg)
+{
+	return smi_cmd(SMI_CMD_WRITE, addr, reg);
+}
+
+__weak int mv88e61xx_hw_reset(struct phy_device *phydev)
+{
+	return 0;
+}
+
+/* Wait for the current SMI indirect command to complete */
+static int mv88e61xx_smi_wait(struct mii_dev *bus, int smi_addr)
+{
+	int val;
+	u32 timeout = 100;
+
+	do {
+		val = bus->read(bus, smi_addr, MDIO_DEVAD_NONE, SMI_CMD_REG);
+		if (val >= 0 && (val & SMI_BUSY) == 0)
+			return 0;
+
+		mdelay(1);
+	} while (--timeout);
+
+	puts("SMI busy timeout\n");
+	return -ETIMEDOUT;
+}
+
+/*
+ * The mv88e61xx has three types of addresses: the smi bus address, the device
+ * address, and the register address.  The smi bus address distinguishes it on
+ * the smi bus from other PHYs or switches.  The device address determines
+ * which on-chip register set you are reading/writing (the various PHYs, their
+ * associated ports, or global configuration registers).  The register address
+ * is the offset of the register you are reading/writing.
+ *
+ * When the mv88e61xx is hardware configured to have address zero, it behaves in
+ * single-chip addressing mode, where it responds to all SMI addresses, using
+ * the smi address as its device address.  This obviously only works when this
+ * is the only chip on the SMI bus.  This allows the driver to access device
+ * registers without using indirection.  When the chip is configured to a
+ * non-zero address, it only responds to that SMI address and requires indirect
+ * writes to access the different device addresses.
+ */
+static int mv88e61xx_reg_read(struct phy_device *phydev, int dev, int reg)
+{
+	struct mv88e61xx_phy_priv *priv = phydev->priv;
+	struct mii_dev *mdio_bus = priv->mdio_bus;
+	int smi_addr = priv->smi_addr;
+	int res;
+
+	/* In single-chip mode, the device can be addressed directly */
+	if (smi_addr == 0)
+		return mdio_bus->read(mdio_bus, dev, MDIO_DEVAD_NONE, reg);
+
+	/* Wait for the bus to become free */
+	res = mv88e61xx_smi_wait(mdio_bus, smi_addr);
+	if (res < 0)
+		return res;
+
+	/* Issue the read command */
+	res = mdio_bus->write(mdio_bus, smi_addr, MDIO_DEVAD_NONE, SMI_CMD_REG,
+			 smi_cmd_read(dev, reg));
+	if (res < 0)
+		return res;
+
+	/* Wait for the read command to complete */
+	res = mv88e61xx_smi_wait(mdio_bus, smi_addr);
+	if (res < 0)
+		return res;
+
+	/* Read the data */
+	res = mdio_bus->read(mdio_bus, smi_addr, MDIO_DEVAD_NONE, SMI_DATA_REG);
+	if (res < 0)
+		return res;
+
+	return bitfield_extract(res, 0, 16);
+}
+
+/* See the comment above mv88e61xx_reg_read */
+static int mv88e61xx_reg_write(struct phy_device *phydev, int dev, int reg,
+			       u16 val)
+{
+	struct mv88e61xx_phy_priv *priv = phydev->priv;
+	struct mii_dev *mdio_bus = priv->mdio_bus;
+	int smi_addr = priv->smi_addr;
+	int res;
+
+	/* In single-chip mode, the device can be addressed directly */
+	if (smi_addr == 0) {
+		return mdio_bus->write(mdio_bus, dev, MDIO_DEVAD_NONE, reg,
+				val);
+	}
+
+	/* Wait for the bus to become free */
+	res = mv88e61xx_smi_wait(mdio_bus, smi_addr);
+	if (res < 0)
+		return res;
+
+	/* Set the data to write */
+	res = mdio_bus->write(mdio_bus, smi_addr, MDIO_DEVAD_NONE,
+				SMI_DATA_REG, val);
+	if (res < 0)
+		return res;
+
+	/* Issue the write command */
+	res = mdio_bus->write(mdio_bus, smi_addr, MDIO_DEVAD_NONE, SMI_CMD_REG,
+				smi_cmd_write(dev, reg));
+	if (res < 0)
+		return res;
+
+	/* Wait for the write command to complete */
+	res = mv88e61xx_smi_wait(mdio_bus, smi_addr);
+	if (res < 0)
+		return res;
+
+	return 0;
+}
+
+static int mv88e61xx_phy_wait(struct phy_device *phydev)
+{
+	int val;
+	u32 timeout = 100;
+
+	do {
+		val = mv88e61xx_reg_read(phydev, DEVADDR_GLOBAL_2,
+					 GLOBAL2_REG_PHY_CMD);
+		if (val >= 0 && (val & SMI_BUSY) == 0)
+			return 0;
+
+		mdelay(1);
+	} while (--timeout);
+
+	return -ETIMEDOUT;
+}
+
+static int mv88e61xx_phy_read_indirect(struct mii_dev *smi_wrapper, int dev,
+		int devad, int reg)
+{
+	struct phy_device *phydev;
+	int res;
+
+	phydev = (struct phy_device *)smi_wrapper->priv;
+
+	/* Issue command to read */
+	res = mv88e61xx_reg_write(phydev, DEVADDR_GLOBAL_2,
+				  GLOBAL2_REG_PHY_CMD,
+				  smi_cmd_read(dev, reg));
+
+	/* Wait for data to be read */
+	res = mv88e61xx_phy_wait(phydev);
+	if (res < 0)
+		return res;
+
+	/* Read retrieved data */
+	return mv88e61xx_reg_read(phydev, DEVADDR_GLOBAL_2,
+				  GLOBAL2_REG_PHY_DATA);
+}
+
+static int mv88e61xx_phy_write_indirect(struct mii_dev *smi_wrapper, int dev,
+		int devad, int reg, u16 data)
+{
+	struct phy_device *phydev;
+	int res;
+
+	phydev = (struct phy_device *)smi_wrapper->priv;
+
+	/* Set the data to write */
+	res = mv88e61xx_reg_write(phydev, DEVADDR_GLOBAL_2,
+				  GLOBAL2_REG_PHY_DATA, data);
+	if (res < 0)
+		return res;
+	/* Issue the write command */
+	res = mv88e61xx_reg_write(phydev, DEVADDR_GLOBAL_2,
+				  GLOBAL2_REG_PHY_CMD,
+				  smi_cmd_write(dev, reg));
+	if (res < 0)
+		return res;
+
+	/* Wait for command to complete */
+	return mv88e61xx_phy_wait(phydev);
+}
+
+/* Wrapper function to make calls to phy_read_indirect simpler */
+static int mv88e61xx_phy_read(struct phy_device *phydev, int phy, int reg)
+{
+	return mv88e61xx_phy_read_indirect(phydev->bus, DEVADDR_PHY(phy),
+					   MDIO_DEVAD_NONE, reg);
+}
+
+/* Wrapper function to make calls to phy_read_indirect simpler */
+static int mv88e61xx_phy_write(struct phy_device *phydev, int phy,
+		int reg, u16 val)
+{
+	return mv88e61xx_phy_write_indirect(phydev->bus, DEVADDR_PHY(phy),
+					    MDIO_DEVAD_NONE, reg, val);
+}
+
+static int mv88e61xx_port_read(struct phy_device *phydev, u8 port, u8 reg)
+{
+	return mv88e61xx_reg_read(phydev, DEVADDR_PORT(port), reg);
+}
+
+static int mv88e61xx_port_write(struct phy_device *phydev, u8 port, u8 reg,
+								u16 val)
+{
+	return mv88e61xx_reg_write(phydev, DEVADDR_PORT(port), reg, val);
+}
+
+static int mv88e61xx_set_page(struct phy_device *phydev, u8 phy, u8 page)
+{
+	return mv88e61xx_phy_write(phydev, phy, PHY_REG_PAGE, page);
+}
+
+static int mv88e61xx_get_switch_id(struct phy_device *phydev)
+{
+	int res;
+
+	res = mv88e61xx_port_read(phydev, 0, PORT_REG_SWITCH_ID);
+	if (res < 0)
+		return res;
+	return res & 0xfff0;
+}
+
+static bool mv88e61xx_6352_family(struct phy_device *phydev)
+{
+	struct mv88e61xx_phy_priv *priv = phydev->priv;
+
+	switch (priv->id) {
+	case PORT_SWITCH_ID_6172:
+	case PORT_SWITCH_ID_6176:
+	case PORT_SWITCH_ID_6240:
+	case PORT_SWITCH_ID_6352:
+		return true;
+	}
+	return false;
+}
+
+static int mv88e61xx_get_cmode(struct phy_device *phydev, u8 port)
+{
+	int res;
+
+	res = mv88e61xx_port_read(phydev, port, PORT_REG_STATUS);
+	if (res < 0)
+		return res;
+	return res & PORT_REG_STATUS_CMODE_MASK;
+}
+
+static int mv88e61xx_parse_status(struct phy_device *phydev)
+{
+	unsigned int speed;
+	unsigned int mii_reg;
+
+	mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, PHY_REG_STATUS1);
+
+	if ((mii_reg & PHY_REG_STATUS1_LINK) &&
+	    !(mii_reg & PHY_REG_STATUS1_SPDDONE)) {
+		int i = 0;
+
+		puts("Waiting for PHY realtime link");
+		while (!(mii_reg & PHY_REG_STATUS1_SPDDONE)) {
+			/* Timeout reached ? */
+			if (i > PHY_AUTONEGOTIATE_TIMEOUT) {
+				puts(" TIMEOUT !\n");
+				phydev->link = 0;
+				break;
+			}
+
+			if ((i++ % 1000) == 0)
+				putc('.');
+			udelay(1000);
+			mii_reg = phy_read(phydev, MDIO_DEVAD_NONE,
+					PHY_REG_STATUS1);
+		}
+		puts(" done\n");
+		udelay(500000);	/* another 500 ms (results in faster booting) */
+	} else {
+		if (mii_reg & PHY_REG_STATUS1_LINK)
+			phydev->link = 1;
+		else
+			phydev->link = 0;
+	}
+
+	if (mii_reg & PHY_REG_STATUS1_DUPLEX)
+		phydev->duplex = DUPLEX_FULL;
+	else
+		phydev->duplex = DUPLEX_HALF;
+
+	speed = mii_reg & PHY_REG_STATUS1_SPEED;
+
+	switch (speed) {
+	case PHY_REG_STATUS1_GBIT:
+		phydev->speed = SPEED_1000;
+		break;
+	case PHY_REG_STATUS1_100:
+		phydev->speed = SPEED_100;
+		break;
+	default:
+		phydev->speed = SPEED_10;
+		break;
+	}
+
+	return 0;
+}
+
+static int mv88e61xx_switch_reset(struct phy_device *phydev)
+{
+	int time;
+	int val;
+	u8 port;
+
+	/* Disable all ports */
+	for (port = 0; port < PORT_COUNT; port++) {
+		val = mv88e61xx_port_read(phydev, port, PORT_REG_CTRL);
+		if (val < 0)
+			return val;
+		val = bitfield_replace(val, PORT_REG_CTRL_PSTATE_SHIFT,
+				       PORT_REG_CTRL_PSTATE_WIDTH,
+				       PORT_REG_CTRL_PSTATE_DISABLED);
+		val = mv88e61xx_port_write(phydev, port, PORT_REG_CTRL, val);
+		if (val < 0)
+			return val;
+	}
+
+	/* Wait 2 ms for queues to drain */
+	udelay(2000);
+
+	/* Reset switch */
+	val = mv88e61xx_reg_read(phydev, DEVADDR_GLOBAL_1, GLOBAL1_CTRL);
+	if (val < 0)
+		return val;
+	val |= GLOBAL1_CTRL_SWRESET;
+	val = mv88e61xx_reg_write(phydev, DEVADDR_GLOBAL_1,
+				     GLOBAL1_CTRL, val);
+	if (val < 0)
+		return val;
+
+	/* Wait up to 1 second for switch reset complete */
+	for (time = 1000; time; time--) {
+		val = mv88e61xx_reg_read(phydev, DEVADDR_GLOBAL_1,
+					    GLOBAL1_CTRL);
+		if (val >= 0 && ((val & GLOBAL1_CTRL_SWRESET) == 0))
+			break;
+		udelay(1000);
+	}
+	if (!time)
+		return -ETIMEDOUT;
+
+	return 0;
+}
+
+static int mv88e61xx_serdes_init(struct phy_device *phydev)
+{
+	int val;
+
+	val = mv88e61xx_set_page(phydev, DEVADDR_SERDES, PHY_PAGE_SERDES);
+	if (val < 0)
+		return val;
+
+	/* Power up serdes module */
+	val = mv88e61xx_phy_read(phydev, DEVADDR_SERDES, MII_BMCR);
+	if (val < 0)
+		return val;
+	val &= ~(BMCR_PDOWN);
+	val = mv88e61xx_phy_write(phydev, DEVADDR_SERDES, MII_BMCR, val);
+	if (val < 0)
+		return val;
+
+	return 0;
+}
+
+static int mv88e61xx_port_enable(struct phy_device *phydev, u8 port)
+{
+	int val;
+
+	val = mv88e61xx_port_read(phydev, port, PORT_REG_CTRL);
+	if (val < 0)
+		return val;
+	val = bitfield_replace(val, PORT_REG_CTRL_PSTATE_SHIFT,
+			       PORT_REG_CTRL_PSTATE_WIDTH,
+			       PORT_REG_CTRL_PSTATE_FORWARD);
+	val = mv88e61xx_port_write(phydev, port, PORT_REG_CTRL, val);
+	if (val < 0)
+		return val;
+
+	return 0;
+}
+
+static int mv88e61xx_port_set_vlan(struct phy_device *phydev, u8 port,
+							u8 mask)
+{
+	int val;
+
+	/* Set VID to port number plus one */
+	val = mv88e61xx_port_read(phydev, port, PORT_REG_VLAN_ID);
+	if (val < 0)
+		return val;
+	val = bitfield_replace(val, PORT_REG_VLAN_ID_DEF_VID_SHIFT,
+			       PORT_REG_VLAN_ID_DEF_VID_WIDTH,
+			       port + 1);
+	val = mv88e61xx_port_write(phydev, port, PORT_REG_VLAN_ID, val);
+	if (val < 0)
+		return val;
+
+	/* Set VID mask */
+	val = mv88e61xx_port_read(phydev, port, PORT_REG_VLAN_MAP);
+	if (val < 0)
+		return val;
+	val = bitfield_replace(val, PORT_REG_VLAN_MAP_TABLE_SHIFT,
+			       PORT_REG_VLAN_MAP_TABLE_WIDTH,
+			       mask);
+	val = mv88e61xx_port_write(phydev, port, PORT_REG_VLAN_MAP, val);
+	if (val < 0)
+		return val;
+
+	return 0;
+}
+
+static int mv88e61xx_read_port_config(struct phy_device *phydev, u8 port)
+{
+	int res;
+	int val;
+	bool forced = false;
+
+	val = mv88e61xx_port_read(phydev, port, PORT_REG_STATUS);
+	if (val < 0)
+		return val;
+	if (!(val & PORT_REG_STATUS_LINK)) {
+		/* Temporarily force link to read port configuration */
+		u32 timeout = 100;
+		forced = true;
+
+		val = mv88e61xx_port_read(phydev, port, PORT_REG_PHYS_CTRL);
+		if (val < 0)
+			return val;
+		val |= (PORT_REG_PHYS_CTRL_LINK_FORCE |
+				PORT_REG_PHYS_CTRL_LINK_VALUE);
+		val = mv88e61xx_port_write(phydev, port, PORT_REG_PHYS_CTRL,
+					   val);
+		if (val < 0)
+			return val;
+
+		/* Wait for status register to reflect forced link */
+		do {
+			val = mv88e61xx_port_read(phydev, port,
+						  PORT_REG_STATUS);
+			if (val < 0)
+				goto unforce;
+			if (val & PORT_REG_STATUS_LINK)
+				break;
+		} while (--timeout);
+
+		if (timeout == 0) {
+			res = -ETIMEDOUT;
+			goto unforce;
+		}
+	}
+
+	if (val & PORT_REG_STATUS_DUPLEX)
+		phydev->duplex = DUPLEX_FULL;
+	else
+		phydev->duplex = DUPLEX_HALF;
+
+	val = bitfield_extract(val, PORT_REG_STATUS_SPEED_SHIFT,
+			       PORT_REG_STATUS_SPEED_WIDTH);
+	switch (val) {
+	case PORT_REG_STATUS_SPEED_1000:
+		phydev->speed = SPEED_1000;
+		break;
+	case PORT_REG_STATUS_SPEED_100:
+		phydev->speed = SPEED_100;
+		break;
+	default:
+		phydev->speed = SPEED_10;
+		break;
+	}
+
+	res = 0;
+
+unforce:
+	if (forced) {
+		val = mv88e61xx_port_read(phydev, port, PORT_REG_PHYS_CTRL);
+		if (val < 0)
+			return val;
+		val &= ~(PORT_REG_PHYS_CTRL_LINK_FORCE |
+				PORT_REG_PHYS_CTRL_LINK_VALUE);
+		val = mv88e61xx_port_write(phydev, port, PORT_REG_PHYS_CTRL,
+					   val);
+		if (val < 0)
+			return val;
+	}
+
+	return res;
+}
+
+static int mv88e61xx_set_cpu_port(struct phy_device *phydev)
+{
+	int val;
+
+	/* Set CPUDest */
+	val = mv88e61xx_reg_read(phydev, DEVADDR_GLOBAL_1, GLOBAL1_MON_CTRL);
+	if (val < 0)
+		return val;
+	val = bitfield_replace(val, GLOBAL1_MON_CTRL_CPUDEST_SHIFT,
+			       GLOBAL1_MON_CTRL_CPUDEST_WIDTH,
+			       CONFIG_MV88E61XX_CPU_PORT);
+	val = mv88e61xx_reg_write(phydev, DEVADDR_GLOBAL_1,
+				     GLOBAL1_MON_CTRL, val);
+	if (val < 0)
+		return val;
+
+	/* Allow CPU to route to any port */
+	val = PORT_MASK & ~(1 << CONFIG_MV88E61XX_CPU_PORT);
+	val = mv88e61xx_port_set_vlan(phydev, CONFIG_MV88E61XX_CPU_PORT, val);
+	if (val < 0)
+		return val;
+
+	/* Enable CPU port */
+	val = mv88e61xx_port_enable(phydev, CONFIG_MV88E61XX_CPU_PORT);
+	if (val < 0)
+		return val;
+
+	val = mv88e61xx_read_port_config(phydev, CONFIG_MV88E61XX_CPU_PORT);
+	if (val < 0)
+		return val;
+
+	/* If CPU is connected to serdes, initialize serdes */
+	if (mv88e61xx_6352_family(phydev)) {
+		val = mv88e61xx_get_cmode(phydev, CONFIG_MV88E61XX_CPU_PORT);
+		if (val < 0)
+			return val;
+		if (val == PORT_REG_STATUS_CMODE_100BASE_X ||
+		    val == PORT_REG_STATUS_CMODE_1000BASE_X ||
+		    val == PORT_REG_STATUS_CMODE_SGMII) {
+			val = mv88e61xx_serdes_init(phydev);
+			if (val < 0)
+				return val;
+		}
+	}
+
+	return 0;
+}
+
+static int mv88e61xx_switch_init(struct phy_device *phydev)
+{
+	static int init;
+	int res;
+
+	if (init)
+		return 0;
+
+	res = mv88e61xx_switch_reset(phydev);
+	if (res < 0)
+		return res;
+
+	res = mv88e61xx_set_cpu_port(phydev);
+	if (res < 0)
+		return res;
+
+	init = 1;
+
+	return 0;
+}
+
+static int mv88e61xx_phy_enable(struct phy_device *phydev, u8 phy)
+{
+	int val;
+
+	val = mv88e61xx_phy_read(phydev, phy, MII_BMCR);
+	if (val < 0)
+		return val;
+	val &= ~(BMCR_PDOWN);
+	val = mv88e61xx_phy_write(phydev, phy, MII_BMCR, val);
+	if (val < 0)
+		return val;
+
+	return 0;
+}
+
+static int mv88e61xx_phy_setup(struct phy_device *phydev, u8 phy)
+{
+	int val;
+
+	/*
+	 * Enable energy-detect sensing on PHY, used to determine when a PHY
+	 * port is physically connected
+	 */
+	val = mv88e61xx_phy_read(phydev, phy, PHY_REG_CTRL1);
+	if (val < 0)
+		return val;
+	val = bitfield_replace(val, PHY_REG_CTRL1_ENERGY_DET_SHIFT,
+			       PHY_REG_CTRL1_ENERGY_DET_WIDTH,
+			       PHY_REG_CTRL1_ENERGY_DET_SENSE_XMIT);
+	val = mv88e61xx_phy_write(phydev, phy, PHY_REG_CTRL1, val);
+	if (val < 0)
+		return val;
+
+	return 0;
+}
+
+static int mv88e61xx_phy_config_port(struct phy_device *phydev, u8 phy)
+{
+	int val;
+
+	val = mv88e61xx_port_enable(phydev, phy);
+	if (val < 0)
+		return val;
+
+	val = mv88e61xx_port_set_vlan(phydev, phy,
+			1 << CONFIG_MV88E61XX_CPU_PORT);
+	if (val < 0)
+		return val;
+
+	return 0;
+}
+
+static int mv88e61xx_probe(struct phy_device *phydev)
+{
+	struct mii_dev *smi_wrapper;
+	struct mv88e61xx_phy_priv *priv;
+	int res;
+
+	res = mv88e61xx_hw_reset(phydev);
+	if (res < 0)
+		return res;
+
+	priv = malloc(sizeof(*priv));
+	if (!priv)
+		return -ENOMEM;
+
+	memset(priv, 0, sizeof(*priv));
+
+	/*
+	 * This device requires indirect reads/writes to the PHY registers
+	 * which the generic PHY code can't handle.  Make a wrapper MII device
+	 * to handle reads/writes
+	 */
+	smi_wrapper = mdio_alloc();
+	if (!smi_wrapper) {
+		free(priv);
+		return -ENOMEM;
+	}
+
+	/*
+	 * Store the mdio bus in the private data, as we are going to replace
+	 * the bus with the wrapper bus
+	 */
+	priv->mdio_bus = phydev->bus;
+
+	/*
+	 * Store the smi bus address in private data.  This lets us use the
+	 * phydev addr field for device address instead, as the genphy code
+	 * expects.
+	 */
+	priv->smi_addr = phydev->addr;
+
+	/*
+	 * Store the phy_device in the wrapper mii device. This lets us get it
+	 * back when genphy functions call phy_read/phy_write.
+	 */
+	smi_wrapper->priv = phydev;
+	strncpy(smi_wrapper->name, "indirect mii", sizeof(smi_wrapper->name));
+	smi_wrapper->read = mv88e61xx_phy_read_indirect;
+	smi_wrapper->write = mv88e61xx_phy_write_indirect;
+
+	/* Replace the bus with the wrapper device */
+	phydev->bus = smi_wrapper;
+
+	phydev->priv = priv;
+
+	priv->id = mv88e61xx_get_switch_id(phydev);
+
+	return 0;
+}
+
+static int mv88e61xx_phy_config(struct phy_device *phydev)
+{
+	int res;
+	int i;
+	int ret = -1;
+
+	res = mv88e61xx_switch_init(phydev);
+	if (res < 0)
+		return res;
+
+	for (i = 0; i < PORT_COUNT; i++) {
+		if ((1 << i) & CONFIG_MV88E61XX_PHY_PORTS) {
+			phydev->addr = i;
+
+			res = mv88e61xx_phy_enable(phydev, i);
+			if (res < 0) {
+				printf("Error enabling PHY %i\n", i);
+				continue;
+			}
+			res = mv88e61xx_phy_setup(phydev, i);
+			if (res < 0) {
+				printf("Error setting up PHY %i\n", i);
+				continue;
+			}
+			res = mv88e61xx_phy_config_port(phydev, i);
+			if (res < 0) {
+				printf("Error configuring PHY %i\n", i);
+				continue;
+			}
+
+			res = genphy_config_aneg(phydev);
+			if (res < 0) {
+				printf("Error setting PHY %i autoneg\n", i);
+				continue;
+			}
+			res = phy_reset(phydev);
+			if (res < 0) {
+				printf("Error resetting PHY %i\n", i);
+				continue;
+			}
+
+			/* Return success if any PHY succeeds */
+			ret = 0;
+		}
+	}
+
+	return ret;
+}
+
+static int mv88e61xx_phy_is_connected(struct phy_device *phydev)
+{
+	int val;
+
+	val = mv88e61xx_phy_read(phydev, phydev->addr, PHY_REG_STATUS1);
+	if (val < 0)
+		return 0;
+
+	/*
+	 * After reset, the energy detect signal remains high for a few seconds
+	 * regardless of whether a cable is connected.  This function will
+	 * return false positives during this time.
+	 */
+	return (val & PHY_REG_STATUS1_ENERGY) == 0;
+}
+
+static int mv88e61xx_phy_startup(struct phy_device *phydev)
+{
+	int i;
+	int link = 0;
+	int res;
+	int speed = phydev->speed;
+	int duplex = phydev->duplex;
+
+	for (i = 0; i < PORT_COUNT; i++) {
+		if ((1 << i) & CONFIG_MV88E61XX_PHY_PORTS) {
+			phydev->addr = i;
+			if (!mv88e61xx_phy_is_connected(phydev))
+				continue;
+			res = genphy_update_link(phydev);
+			if (res < 0)
+				continue;
+			res = mv88e61xx_parse_status(phydev);
+			if (res < 0)
+				continue;
+			link = (link || phydev->link);
+		}
+	}
+	phydev->link = link;
+
+	/* Restore CPU interface speed and duplex after it was changed for
+	 * other ports */
+	phydev->speed = speed;
+	phydev->duplex = duplex;
+
+	return 0;
+}
+
+static struct phy_driver mv88e61xx_driver = {
+	.name = "Marvell MV88E61xx",
+	.uid = 0x01410eb1,
+	.mask = 0xfffffff0,
+	.features = PHY_GBIT_FEATURES,
+	.probe = mv88e61xx_probe,
+	.config = mv88e61xx_phy_config,
+	.startup = mv88e61xx_phy_startup,
+	.shutdown = &genphy_shutdown,
+};
+
+int phy_mv88e61xx_init(void)
+{
+	phy_register(&mv88e61xx_driver);
+
+	return 0;
+}
+
+/*
+ * Overload weak get_phy_id definition since we need non-standard functions
+ * to read PHY registers
+ */
+int get_phy_id(struct mii_dev *bus, int smi_addr, int devad, u32 *phy_id)
+{
+	struct phy_device temp_phy;
+	struct mv88e61xx_phy_priv temp_priv;
+	struct mii_dev temp_mii;
+	int val;
+
+	/*
+	 * Buid temporary data structures that the chip reading code needs to
+	 * read the ID
+	 */
+	temp_priv.mdio_bus = bus;
+	temp_priv.smi_addr = smi_addr;
+	temp_phy.priv = &temp_priv;
+	temp_mii.priv = &temp_phy;
+
+	val = mv88e61xx_phy_read_indirect(&temp_mii, 0, devad, MII_PHYSID1);
+	if (val < 0)
+		return -EIO;
+
+	*phy_id = val << 16;
+
+	val = mv88e61xx_phy_read_indirect(&temp_mii, 0, devad, MII_PHYSID2);
+	if (val < 0)
+		return -EIO;
+
+	*phy_id |= (val & 0xffff);
+
+	return 0;
+}

drivers/net/phy/phy.c

@@ -458,6 +458,9 @@ static LIST_HEAD(phy_drivers);
 
 int phy_init(void)
 {
+#ifdef CONFIG_MV88E61XX_SWITCH
+	phy_mv88e61xx_init();
+#endif
 #ifdef CONFIG_PHY_AQUANTIA
 	phy_aquantia_init();
 #endif

include/phy.h

@@ -249,6 +249,7 @@ int gen10g_startup(struct phy_device *phydev);
 int gen10g_shutdown(struct phy_device *phydev);
 int gen10g_discover_mmds(struct phy_device *phydev);
 
+int phy_mv88e61xx_init(void);
 int phy_aquantia_init(void);
 int phy_atheros_init(void);
 int phy_broadcom_init(void);