mii.h

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#ifndef _IPXE_MII_H
#define _IPXE_MII_H

/** @file
 *
 * Media Independent Interface
 *
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

#include <mii.h>
#include <ipxe/netdevice.h>

struct mii_interface;

/** MII interface operations */
struct mii_operations {
        /**
         * Read from MII register
         *
         * @v mdio              MII interface
         * @v phy               PHY address
         * @v reg               Register address
         * @ret data            Data read, or negative error
         */
        int ( * read ) ( struct mii_interface *mdio, unsigned int phy,
                         unsigned int reg );
        /**
         * Write to MII register
         *
         * @v mdio              MII interface
         * @v phy               PHY address
         * @v reg               Register address
         * @v data              Data to write
         * @ret rc              Return status code
         */
        int ( * write ) ( struct mii_interface *mdio, unsigned int phy,
                          unsigned int reg, unsigned int data );
};

/** An MII interface */
struct mii_interface {
        /** Interface operations */
        struct mii_operations *op;
};

/** An MII device */
struct mii_device {
        /** MII interface */
        struct mii_interface *mdio;
        /** PHY address */
        unsigned int address;
};

/**
 * Initialise MII interface
 *
 * @v mdio              MII interface
 * @v op                MII interface operations
 */
static inline __attribute__ (( always_inline )) void
mdio_init ( struct mii_interface *mdio, struct mii_operations *op ) {
        mdio->op = op;
}

/**
 * Initialise MII device
 *
 * @v mii               MII device
 * @v mdio              MII interface
 * @v address           PHY address
 */
static inline __attribute__ (( always_inline )) void
mii_init ( struct mii_device *mii, struct mii_interface *mdio,
           unsigned int address ) {
        mii->mdio = mdio;
        mii->address = address;
}

/**
 * Read from MII register
 *
 * @v mii               MII device
 * @v reg               Register address
 * @ret data            Data read, or negative error
 */
static inline __attribute__ (( always_inline )) int
mii_read ( struct mii_device *mii, unsigned int reg ) {
        struct mii_interface *mdio = mii->mdio;

        return mdio->op->read ( mdio, mii->address, reg );
}

/**
 * Write to MII register
 *
 * @v mii               MII device
 * @v reg               Register address
 * @v data              Data to write
 * @ret rc              Return status code
 */
static inline __attribute__ (( always_inline )) int
mii_write ( struct mii_device *mii, unsigned int reg, unsigned int data ) {
        struct mii_interface *mdio = mii->mdio;

        return mdio->op->write ( mdio, mii->address, reg, data );
}

/**
 * Dump MII registers (for debugging)
 *
 * @v mii               MII device
 */
static inline void
mii_dump ( struct mii_device *mii ) {
        unsigned int i;
        int data;

        /* Do nothing unless debug output is enabled */
        if ( ! DBG_LOG )
                return;

        /* Dump basic MII register set */
        for ( i = 0 ; i < 16 ; i++ ) {
                if ( ( i % 8 ) == 0 ) {
                        DBGC ( mii, "MII %p registers %02x-%02x:",
                               mii, i, ( i + 7 ) );
                }
                data = mii_read ( mii, i );
                if ( data >= 0 ) {
                        DBGC ( mii, " %04x", data );
                } else {
                        DBGC ( mii, " XXXX" );
                }
                if ( ( i % 8 ) == 7 )
                        DBGC ( mii, "\n" );
        }
}

/** Maximum time to wait for a reset, in milliseconds */
#define MII_RESET_MAX_WAIT_MS 500

/** Maximum PHY address */
#define MII_MAX_PHY_ADDRESS 31

extern int mii_restart ( struct mii_device *mii );
extern int mii_reset ( struct mii_device *mii );
extern int mii_check_link ( struct mii_device *mii,
                            struct net_device *netdev );
extern int mii_find ( struct mii_device *mii );

#endif /* _IPXE_MII_H */