mii.c File Reference

Media Independent Interface. More...

#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <ipxe/mii.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
int	mii_restart (struct mii_device *mii)
	Restart autonegotiation. More...
int	mii_reset (struct mii_device *mii)
	Reset MII device. More...
int	mii_check_link (struct mii_device *mii, struct net_device *netdev)
	Update link status via MII. More...
int	mii_find (struct mii_device *mii)
	Find PHY address. More...

Detailed Description

Media Independent Interface.

Definition in file mii.c.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

mii_restart()

int mii_restart

(

struct mii_device *

mii

)

Restart autonegotiation.

Parameters

mii	MII device

Return values

rc	Return status code

Definition at line 43 of file mii.c.

                                           {
        int bmcr;
        int rc;

        /* Read BMCR */
        bmcr = mii_read ( mii, MII_BMCR );
        if ( bmcr < 0 ) {
                rc = bmcr;
                DBGC ( mii, "MII %p could not read BMCR: %s\n",
                       mii, strerror ( rc ) );
                return rc;
        }

        /* Enable and restart autonegotiation */
        bmcr |= ( BMCR_ANENABLE | BMCR_ANRESTART );
        if ( ( rc = mii_write ( mii, MII_BMCR, bmcr ) ) != 0 ) {
                DBGC ( mii, "MII %p could not write BMCR: %s\n",
                       mii, strerror ( rc ) );
                return rc;
        }

        DBGC ( mii, "MII %p restarted autonegotiation\n", mii );
        return 0;
}

References BMCR_ANENABLE, BMCR_ANRESTART, DBGC, mii, MII_BMCR, mii_read(), mii_write(), rc, and strerror().

Referenced by mii_reset(), and realtek_phy_reset().

mii_reset()

int mii_reset

(

struct mii_device *

mii

)

Reset MII device.

Parameters

mii	MII device

Return values

rc	Return status code

Definition at line 74 of file mii.c.

                                         {
        unsigned int i;
        int bmcr;
        int rc;

        /* Power-up, enable autonegotiation and initiate reset */
        if ( ( rc = mii_write ( mii, MII_BMCR,
                                ( BMCR_RESET | BMCR_ANENABLE ) ) ) != 0 ) {
                DBGC ( mii, "MII %p could not write BMCR: %s\n",
                       mii, strerror ( rc ) );
                return rc;
        }

        /* Wait for reset to complete */
        for ( i = 0 ; i < MII_RESET_MAX_WAIT_MS ; i++ ) {

                /* Check if reset has completed */
                bmcr = mii_read ( mii, MII_BMCR );
                if ( bmcr < 0 ) {
                        rc = bmcr;
                        DBGC ( mii, "MII %p could not read BMCR: %s\n",
                               mii, strerror ( rc ) );
                        return rc;
                }

                /* If reset is not complete, delay 1ms and retry */
                if ( bmcr & BMCR_RESET ) {
                        mdelay ( 1 );
                        continue;
                }

                /* Force autonegotation on again, in case it was
                 * cleared by the reset.
                 */
                if ( ( rc = mii_restart ( mii ) ) != 0 )
                        return rc;

                DBGC ( mii, "MII %p reset after %dms\n", mii, i );
                return 0;
        }

        DBGC ( mii, "MII %p timed out waiting for reset\n", mii );
        return -ETIMEDOUT;
}

References BMCR_ANENABLE, BMCR_RESET, DBGC, ETIMEDOUT, mdelay(), mii, MII_BMCR, mii_read(), MII_RESET_MAX_WAIT_MS, mii_restart(), mii_write(), rc, and strerror().

Referenced by cgem_init_phy(), icplus_init_phy(), rdc_init_phy(), realtek_phy_reset(), rhine_probe(), and velocity_probe().

mii_check_link()

int mii_check_link	(	struct mii_device *	mii,
		struct net_device *	netdev
	)

Update link status via MII.

Parameters

mii	MII device
netdev	Network device

Return values

rc	Return status code

Definition at line 126 of file mii.c.

                                                                         {
        int bmsr;
        int link;
        int rc;

        /* Read BMSR */
        bmsr = mii_read ( mii, MII_BMSR );
        if ( bmsr < 0 ) {
                rc = bmsr;
                return rc;
        }

        /* Report link status */
        link = ( bmsr & BMSR_LSTATUS );
        DBGC ( mii, "MII %p link %s (BMSR %#04x)\n",
               mii, ( link ? "up" : "down" ), bmsr );
        if ( link ) {
                netdev_link_up ( netdev );
        } else {
                netdev_link_down ( netdev );
        }

        return 0;
}

References BMSR_LSTATUS, DBGC, link, mii, MII_BMSR, mii_read(), netdev, netdev_link_down(), netdev_link_up(), and rc.

Referenced by cgem_check_link(), rdc_check_link(), and smscusb_mii_check_link().

mii_find()

int mii_find

(

struct mii_device *

mii

)

Find PHY address.

Parameters

mii	MII device

Return values

rc	Return status code

Definition at line 157 of file mii.c.

                                        {
        unsigned int address;
        int id;

        /* Try all possible PHY addresses */
        for ( address = 0 ; address <= MII_MAX_PHY_ADDRESS ; address++ ) {
                mii->address = address;
                id = mii_read ( mii, MII_PHYSID1 );
                if ( ( id > 0x0000 ) && ( id < 0xffff ) ) {
                        DBGC ( mii, "MII %p found PHY at address %d\n",
                               mii, address );
                        return 0;
                }
        }

        DBGC ( mii, "MII %p failed to find an address\n", mii );
        return -ENOENT;
}

References address, DBGC, ENOENT, id, mii, MII_MAX_PHY_ADDRESS, MII_PHYSID1, and mii_read().

Referenced by cgem_init_phy(), icplus_init_phy(), and rdc_init_phy().