Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / ipxe / src / drivers / net / mii.c

diff --git a/qemu/roms/ipxe/src/drivers/net/mii.c b/qemu/roms/ipxe/src/drivers/net/mii.c
new file mode 100644 (file)
index 0000000..c4d3251
--- /dev/null
+++ b/qemu/roms/ipxe/src/drivers/net/mii.c
@@ -0,0 +1,113 @@
+/*
+ * 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
+ *
+ */
+
+/**
+ * Restart autonegotiation
+ *
+ * @v mii              MII interface
+ * @ret rc             Return status code
+ */
+int mii_restart ( struct mii_interface *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 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_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;
+}