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-rw-r--r--roms/ipxe/src/drivers/net/mii.c174
1 files changed, 174 insertions, 0 deletions
diff --git a/roms/ipxe/src/drivers/net/mii.c b/roms/ipxe/src/drivers/net/mii.c
new file mode 100644
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+++ b/roms/ipxe/src/drivers/net/mii.c
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+/*
+ * 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.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <ipxe/mii.h>
+
+/** @file
+ *
+ * Media Independent Interface
+ *
+ */
+
+/**
+ * Restart autonegotiation
+ *
+ * @v mii MII device
+ * @ret rc Return status code
+ */
+int mii_restart ( struct mii_device *mii ) {
+ 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;
+}
+
+/**
+ * Reset MII device
+ *
+ * @v mii MII device
+ * @ret rc Return status code
+ */
+int mii_reset ( struct mii_device *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_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;
+}
+
+/**
+ * Update link status via MII
+ *
+ * @v mii MII device
+ * @v netdev Network device
+ * @ret rc Return status code
+ */
+int mii_check_link ( struct mii_device *mii, struct net_device *netdev ) {
+ 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;
+}
+
+/**
+ * Find PHY address
+ *
+ * @v mii MII device
+ * @ret rc Return status code
+ */
+int mii_find ( struct mii_device *mii ) {
+ 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;
+}