From c609719b8d1b2dca590e0ed499016d041203e403 Mon Sep 17 00:00:00 2001
From: wdenk <wdenk>
Date: Sun, 3 Nov 2002 00:24:07 +0000
Subject: Initial revision

---
 common/miiphyutil.c | 172 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 172 insertions(+)
 create mode 100644 common/miiphyutil.c

(limited to 'common/miiphyutil.c')

diff --git a/common/miiphyutil.c b/common/miiphyutil.c
new file mode 100644
index 0000000..6b2425f
--- /dev/null
+++ b/common/miiphyutil.c
@@ -0,0 +1,172 @@
+/*
+ * (C) Copyright 2001
+ * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * This provides a bit-banged interface to the ethernet MII management
+ * channel.
+ */
+
+#include <common.h>
+#include <miiphy.h>
+
+#if defined(CONFIG_MII) || (CONFIG_COMMANDS & CFG_CMD_MII)
+
+/*****************************************************************************
+ *
+ * Read the OUI, manufacture's model number, and revision number.
+ *
+ * OUI:     22 bits (unsigned int)
+ * Model:    6 bits (unsigned char)
+ * Revision: 4 bits (unsigned char)
+ *
+ * Returns:
+ *   0 on success
+ */
+int miiphy_info (unsigned char addr,
+		 unsigned int *oui,
+		 unsigned char *model, unsigned char *rev)
+{
+	unsigned int reg = 0;
+
+	/*
+	 * Trick: we are reading two 16 registers into a 32 bit variable
+	 * so we do a 16 read into the high order bits of the variable (big
+	 * endian, you know), shift it down 16 bits, and the read the rest.
+	 */
+	if (miiphy_read (addr, PHY_PHYIDR2, (unsigned short *) &reg) != 0) {
+#ifdef DEBUG
+		printf ("PHY ID register 2 read failed\n");
+#endif
+		return (-1);
+	}
+	reg >>= 16;
+
+#ifdef DEBUG
+	printf ("PHY_PHYIDR2 @ 0x%x = 0x%04x\n", addr, reg);
+#endif
+	if (reg == 0xFFFF) {
+		/* No physical device present at this address */
+		return (-1);
+	}
+
+	if (miiphy_read (addr, PHY_PHYIDR1, (unsigned short *) &reg) != 0) {
+#ifdef DEBUG
+		printf ("PHY ID register 1 read failed\n");
+#endif
+		return (-1);
+	}
+#ifdef DEBUG
+	printf ("PHY_PHYIDR[1,2] @ 0x%x = 0x%08x\n", addr, reg);
+#endif
+	*oui   =                 ( reg >> 10);
+	*model = (unsigned char) ((reg >>  4) & 0x0000003F);
+	*rev   = (unsigned char) ( reg        & 0x0000000F);
+	return (0);
+}
+
+
+/*****************************************************************************
+ *
+ * Reset the PHY.
+ * Returns:
+ *   0 on success
+ */
+int miiphy_reset (unsigned char addr)
+{
+	unsigned short reg;
+	int loop_cnt;
+
+	if (miiphy_write (addr, PHY_BMCR, 0x8000) != 0) {
+#ifdef DEBUG
+		printf ("PHY reset failed\n");
+#endif
+		return (-1);
+	}
+
+	/*
+	 * Poll the control register for the reset bit to go to 0 (it is
+	 * auto-clearing).  This should happen within 0.5 seconds per the
+	 * IEEE spec.
+	 */
+	loop_cnt = 0;
+	reg = 0x8000;
+	while (((reg & 0x8000) != 0) && (loop_cnt++ < 1000000)) {
+		if (miiphy_read (addr, PHY_BMCR, &reg) != 0) {
+#     ifdef DEBUG
+			printf ("PHY status read failed\n");
+#     endif
+			return (-1);
+		}
+	}
+	if ((reg & 0x8000) == 0) {
+		return (0);
+	} else {
+		printf ("PHY reset timed out\n");
+		return (-1);
+	}
+	return (0);
+}
+
+
+/*****************************************************************************
+ *
+ * Determine the ethernet speed (10/100).
+ */
+int miiphy_speed (unsigned char addr)
+{
+	unsigned short reg;
+
+	if (miiphy_read (addr, PHY_ANLPAR, &reg)) {
+		printf ("PHY speed1 read failed, assuming 10bT\n");
+		return (_10BASET);
+	}
+
+	if ((reg & PHY_ANLPAR_100) != 0) {
+		return (_100BASET);
+	} else {
+		return (_10BASET);
+	}
+}
+
+
+/*****************************************************************************
+ *
+ * Determine full/half duplex.
+ */
+int miiphy_duplex (unsigned char addr)
+{
+	unsigned short reg;
+
+	if (miiphy_read (addr, PHY_ANLPAR, &reg)) {
+		printf ("PHY duplex read failed, assuming half duplex\n");
+		return (HALF);
+	}
+
+	if ((reg & (PHY_ANLPAR_10FD | PHY_ANLPAR_TXFD)) != 0) {
+		return (FULL);
+	} else {
+		return (HALF);
+	}
+}
+
+#endif /* CONFIG_MII || (CONFIG_COMMANDS & CFG_CMD_MII) */
-- 
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