/*
 * (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;
}