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[mii] Add generic MII reset function
iPXE provides no support for manually configuring the link speed.
Provide a generic routine which should be able to reset any MII/GMII
PHY and enable autonegotiation.

Prototyped-by: Thomas Miletich <thomas.miletich@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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mcb30 committed Apr 18, 2012
1 parent d27e6d6 commit 9b2aabe
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85 changes: 85 additions & 0 deletions src/drivers/net/mii.c
@@ -0,0 +1,85 @@
/*
* Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/

FILE_LICENCE ( GPL2_OR_LATER );

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

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

/**
* Reset MII interface
*
* @v mii MII interface
* @ret rc Return status code
*/
int mii_reset ( struct mii_interface *mii ) {
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_write ( mii, MII_BMCR, BMCR_ANENABLE ) ) != 0 ){
DBGC ( mii, "MII %p could not write BMCR: %s\n",
mii, strerror ( rc ) );
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;
}
1 change: 1 addition & 0 deletions src/include/ipxe/errfile.h
Expand Up @@ -141,6 +141,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#define ERRFILE_ath9k ( ERRFILE_DRIVER | 0x005f0000 )
#define ERRFILE_ath ( ERRFILE_DRIVER | 0x00600000 )
#define ERRFILE_vmxnet3 ( ERRFILE_DRIVER | 0x00610000 )
#define ERRFILE_mii ( ERRFILE_DRIVER | 0x00620000 )

#define ERRFILE_scsi ( ERRFILE_DRIVER | 0x00700000 )
#define ERRFILE_arbel ( ERRFILE_DRIVER | 0x00710000 )
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86 changes: 86 additions & 0 deletions src/include/ipxe/mii.h
@@ -0,0 +1,86 @@
#ifndef _IPXE_MII_H
#define _IPXE_MII_H

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

FILE_LICENCE ( GPL2_OR_LATER );

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

struct mii_interface;

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

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

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

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

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

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

extern int mii_reset ( struct mii_interface *mii );

#endif /* _IPXE_MII_H */

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