2 files changed, 234 insertions, 0 deletions

diff --git a/sys/dev/mii/mii_bitbang.c b/sys/dev/mii/mii_bitbang.c
new file mode 100644
index 000000000000..6a5f5dc7758b
--- /dev/null
+++ b/sys/dev/mii/mii_bitbang.c
@@ -0,0 +1,180 @@
+/*	$NetBSD: mii_bitbang.c,v 1.12 2008/05/04 17:06:09 xtraeme Exp $	*/
+
+/*-
+ * Copyright (c) 1999 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
+ * NASA Ames Research Center.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following didevlaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following didevlaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Common module for bit-bang'ing the MII.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/module.h>
+
+#include <dev/mii/mii.h>
+#include <dev/mii/mii_bitbang.h>
+
+MODULE_VERSION(mii_bitbang, 1);
+
+static void mii_bitbang_sendbits(device_t dev, mii_bitbang_ops_t ops,
+    uint32_t data, int nbits);
+
+#define	MWRITE(x)							\
+do {									\
+	ops->mbo_write(dev, (x));					\
+	DELAY(1);							\
+} while (/* CONSTCOND */ 0)
+
+#define	MREAD		ops->mbo_read(dev)
+
+#define	MDO		ops->mbo_bits[MII_BIT_MDO]
+#define	MDI		ops->mbo_bits[MII_BIT_MDI]
+#define	MDC		ops->mbo_bits[MII_BIT_MDC]
+#define	MDIRPHY		ops->mbo_bits[MII_BIT_DIR_HOST_PHY]
+#define	MDIRHOST	ops->mbo_bits[MII_BIT_DIR_PHY_HOST]
+
+/*
+ * mii_bitbang_sync:
+ *
+ *	Synchronize the MII.
+ */
+void
+mii_bitbang_sync(device_t dev, mii_bitbang_ops_t ops)
+{
+	int i;
+	uint32_t v;
+
+	v = MDIRPHY | MDO;
+
+	MWRITE(v);
+	for (i = 0; i < 32; i++) {
+		MWRITE(v | MDC);
+		MWRITE(v);
+	}
+}
+
+/*
+ * mii_bitbang_sendbits:
+ *
+ *	Send a series of bits to the MII.
+ */
+static void
+mii_bitbang_sendbits(device_t dev, mii_bitbang_ops_t ops, uint32_t data,
+    int nbits)
+{
+	int i;
+	uint32_t v;
+
+	v = MDIRPHY;
+	MWRITE(v);
+
+	for (i = 1 << (nbits - 1); i != 0; i >>= 1) {
+		if (data & i)
+			v |= MDO;
+		else
+			v &= ~MDO;
+		MWRITE(v);
+		MWRITE(v | MDC);
+		MWRITE(v);
+	}
+}
+
+/*
+ * mii_bitbang_readreg:
+ *
+ *	Read a PHY register by bit-bang'ing the MII.
+ */
+int
+mii_bitbang_readreg(device_t dev, mii_bitbang_ops_t ops, int phy, int reg)
+{
+	int i, error, val;
+
+	mii_bitbang_sync(dev, ops);
+
+	mii_bitbang_sendbits(dev, ops, MII_COMMAND_START, 2);
+	mii_bitbang_sendbits(dev, ops, MII_COMMAND_READ, 2);
+	mii_bitbang_sendbits(dev, ops, phy, 5);
+	mii_bitbang_sendbits(dev, ops, reg, 5);
+
+	/* Switch direction to PHY->host, without a clock transition. */
+	MWRITE(MDIRHOST);
+
+	/* Turnaround clock. */
+	MWRITE(MDIRHOST | MDC);
+	MWRITE(MDIRHOST);
+
+	/* Check for error. */
+	error = MREAD & MDI;
+
+	/* Idle clock. */
+	MWRITE(MDIRHOST | MDC);
+	MWRITE(MDIRHOST);
+
+	val = 0;
+	for (i = 0; i < 16; i++) {
+		val <<= 1;
+		/* Read data prior to clock low-high transition. */
+		if (error == 0 && (MREAD & MDI) != 0)
+			val |= 1;
+
+		MWRITE(MDIRHOST | MDC);
+		MWRITE(MDIRHOST);
+	}
+
+	/* Set direction to host->PHY, without a clock transition. */
+	MWRITE(MDIRPHY);
+
+	return (error != 0 ? 0 : val);
+}
+
+/*
+ * mii_bitbang_writereg:
+ *
+ *	Write a PHY register by bit-bang'ing the MII.
+ */
+void
+mii_bitbang_writereg(device_t dev, mii_bitbang_ops_t ops, int phy, int reg,
+    int val)
+{
+
+	mii_bitbang_sync(dev, ops);
+
+	mii_bitbang_sendbits(dev, ops, MII_COMMAND_START, 2);
+	mii_bitbang_sendbits(dev, ops, MII_COMMAND_WRITE, 2);
+	mii_bitbang_sendbits(dev, ops, phy, 5);
+	mii_bitbang_sendbits(dev, ops, reg, 5);
+	mii_bitbang_sendbits(dev, ops, MII_COMMAND_ACK, 2);
+	mii_bitbang_sendbits(dev, ops, val, 16);
+
+	MWRITE(MDIRPHY);
+}
diff --git a/sys/dev/mii/mii_bitbang.h b/sys/dev/mii/mii_bitbang.h
new file mode 100644
index 000000000000..2bc7427625b1
--- /dev/null
+++ b/sys/dev/mii/mii_bitbang.h
@@ -0,0 +1,54 @@
+/*	$NetBSD: mii_bitbang.h,v 1.6 2009/05/12 14:31:27 cegger Exp $	*/
+
+/*-
+ * Copyright (c) 1999 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
+ * NASA Ames Research Center.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#define	MII_BIT_MDO		0	/* data out (host->PHY) */
+#define	MII_BIT_MDI		1	/* data in (PHY->host) */
+#define	MII_BIT_MDC		2	/* clock */
+#define	MII_BIT_DIR_HOST_PHY	3	/* set direction: host->PHY */
+#define	MII_BIT_DIR_PHY_HOST	4	/* set direction: PHY->host */
+#define	MII_NBITS		5
+
+struct mii_bitbang_ops {
+	uint32_t	(*mbo_read)(device_t);
+	void		(*mbo_write)(device_t, uint32_t);
+	uint32_t	mbo_bits[MII_NBITS];
+};
+
+typedef	const struct mii_bitbang_ops *mii_bitbang_ops_t;
+
+int	mii_bitbang_readreg(device_t dev, mii_bitbang_ops_t ops,
+	    int phy, int reg);
+void	mii_bitbang_sync(device_t dev, mii_bitbang_ops_t ops);
+void	mii_bitbang_writereg(device_t dev, mii_bitbang_ops_t ops,
+	    int phy, int reg, int val);