mii_bit.h

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#ifndef _IPXE_MII_BIT_H
#define _IPXE_MII_BIT_H

/** @file
 *
 * MII bit-bashing interface
 *
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

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

#define MII_BIT_START           0xffffffff      /**< Start */
#define MII_BIT_START_MASK      0x80000000      /**< Start mask */

#define MII_BIT_CMD_MASK        0x00000008      /**< Command mask */
#define MII_BIT_CMD_READ        0x00000006      /**< Command read */
#define MII_BIT_CMD_WRITE       0x00000005      /**< Command write */
#define MII_BIT_CMD_RW          0x00000001      /**< Command read or write */

#define MII_BIT_PHY_MASK        0x00000010      /**< PHY mask */

#define MII_BIT_REG_MASK        0x00000010      /**< Register mask */

#define MII_BIT_SWITCH          0x00000002      /**< Switch */
#define MII_BIT_SWITCH_MASK     0x00000002      /**< Switch mask */

#define MII_BIT_DATA_MASK       0x00008000      /**< Data mask */

/** A bit-bashing MII interface */
struct mii_bit_basher {
        /** MII interface */
        struct mii_interface mdio;
        /** Bit-bashing interface */
        struct bit_basher basher;
};

/** Bit indices used for MII bit-bashing interface */
enum {
        /** MII clock */
        MII_BIT_MDC = 0,
        /** MII data */
        MII_BIT_MDIO,
        /** MII data direction */
        MII_BIT_DRIVE,
};

/** Delay between MDC transitions */
#define MII_BIT_UDELAY 1

extern void init_mii_bit_basher ( struct mii_bit_basher *miibit );

#endif /* _IPXE_MII_BIT_H */