1 files changed, 88 insertions, 0 deletions
diff --git a/board/gdsys/common/ihs_mdio.c b/board/gdsys/common/ihs_mdio.c
new file mode 100644
index 0000000000..1d6eb7bd55
--- /dev/null
+++ b/board/gdsys/common/ihs_mdio.c
@@ -0,0 +1,88 @@
+/*
+ * (C) Copyright 2014
+ * Dirk Eibach,  Guntermann & Drunck GmbH, eibach@gdsys.de
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+
+#include <gdsys_fpga.h>
+#include <miiphy.h>
+
+#include "ihs_mdio.h"
+
+static int ihs_mdio_idle(struct mii_dev *bus)
+{
+	struct ihs_mdio_info *info = bus->priv;
+	u16 val;
+	unsigned int ctr = 0;
+
+	do {
+		FPGA_GET_REG(info->fpga, mdio.control, &val);
+		udelay(100);
+		if (ctr++ > 10)
+			return -1;
+	} while (!(val & (1 << 12)));
+
+	return 0;
+}
+
+static int ihs_mdio_reset(struct mii_dev *bus)
+{
+	ihs_mdio_idle(bus);
+
+	return 0;
+}
+
+static int ihs_mdio_read(struct mii_dev *bus, int addr, int dev_addr,
+			 int regnum)
+{
+	struct ihs_mdio_info *info = bus->priv;
+	u16 val;
+
+	ihs_mdio_idle(bus);
+
+	FPGA_SET_REG(info->fpga, mdio.control,
+		     ((addr & 0x1f) << 5) | (regnum & 0x1f) | (2 << 10));
+
+	/* wait for rx data available */
+	udelay(100);
+
+	FPGA_GET_REG(info->fpga, mdio.rx_data, &val);
+
+	return val;
+}
+
+static int ihs_mdio_write(struct mii_dev *bus, int addr, int dev_addr,
+			  int regnum, u16 value)
+{
+	struct ihs_mdio_info *info = bus->priv;
+
+	ihs_mdio_idle(bus);
+
+	FPGA_SET_REG(info->fpga, mdio.address_data, value);
+	FPGA_SET_REG(info->fpga, mdio.control,
+		     ((addr & 0x1f) << 5) | (regnum & 0x1f) | (1 << 10));
+
+	return 0;
+}
+
+int ihs_mdio_init(struct ihs_mdio_info *info)
+{
+	struct mii_dev *bus = mdio_alloc();
+
+	if (!bus) {
+		printf("Failed to allocate FSL MDIO bus\n");
+		return -1;
+	}
+
+	bus->read = ihs_mdio_read;
+	bus->write = ihs_mdio_write;
+	bus->reset = ihs_mdio_reset;
+	sprintf(bus->name, info->name);
+
+	bus->priv = info;
+
+	return mdio_register(bus);
+}