From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/net/ethernet/xilinx/ll_temac_mdio.c | 129 ++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 drivers/net/ethernet/xilinx/ll_temac_mdio.c

(limited to 'drivers/net/ethernet/xilinx/ll_temac_mdio.c')

diff --git a/drivers/net/ethernet/xilinx/ll_temac_mdio.c b/drivers/net/ethernet/xilinx/ll_temac_mdio.c
new file mode 100644
index 000000000..2371c072b
--- /dev/null
+++ b/drivers/net/ethernet/xilinx/ll_temac_mdio.c
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * MDIO bus driver for the Xilinx TEMAC device
+ *
+ * Copyright (c) 2009 Secret Lab Technologies, Ltd.
+ */
+
+#include <linux/io.h>
+#include <linux/netdevice.h>
+#include <linux/mutex.h>
+#include <linux/phy.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+#include <linux/of_mdio.h>
+#include <linux/platform_data/xilinx-ll-temac.h>
+
+#include "ll_temac.h"
+
+/* ---------------------------------------------------------------------
+ * MDIO Bus functions
+ */
+static int temac_mdio_read(struct mii_bus *bus, int phy_id, int reg)
+{
+	struct temac_local *lp = bus->priv;
+	u32 rc;
+	unsigned long flags;
+
+	/* Write the PHY address to the MIIM Access Initiator register.
+	 * When the transfer completes, the PHY register value will appear
+	 * in the LSW0 register
+	 */
+	spin_lock_irqsave(lp->indirect_lock, flags);
+	temac_iow(lp, XTE_LSW0_OFFSET, (phy_id << 5) | reg);
+	rc = temac_indirect_in32_locked(lp, XTE_MIIMAI_OFFSET);
+	spin_unlock_irqrestore(lp->indirect_lock, flags);
+
+	dev_dbg(lp->dev, "temac_mdio_read(phy_id=%i, reg=%x) == %x\n",
+		phy_id, reg, rc);
+
+	return rc;
+}
+
+static int temac_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 val)
+{
+	struct temac_local *lp = bus->priv;
+	unsigned long flags;
+
+	dev_dbg(lp->dev, "temac_mdio_write(phy_id=%i, reg=%x, val=%x)\n",
+		phy_id, reg, val);
+
+	/* First write the desired value into the write data register
+	 * and then write the address into the access initiator register
+	 */
+	spin_lock_irqsave(lp->indirect_lock, flags);
+	temac_indirect_out32_locked(lp, XTE_MGTDR_OFFSET, val);
+	temac_indirect_out32_locked(lp, XTE_MIIMAI_OFFSET, (phy_id << 5) | reg);
+	spin_unlock_irqrestore(lp->indirect_lock, flags);
+
+	return 0;
+}
+
+int temac_mdio_setup(struct temac_local *lp, struct platform_device *pdev)
+{
+	struct ll_temac_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct device_node *np = dev_of_node(&pdev->dev);
+	struct mii_bus *bus;
+	u32 bus_hz;
+	int clk_div;
+	int rc;
+	struct resource res;
+
+	/* Get MDIO bus frequency (if specified) */
+	bus_hz = 0;
+	if (np)
+		of_property_read_u32(np, "clock-frequency", &bus_hz);
+	else if (pdata)
+		bus_hz = pdata->mdio_clk_freq;
+
+	/* Calculate a reasonable divisor for the clock rate */
+	clk_div = 0x3f; /* worst-case default setting */
+	if (bus_hz != 0) {
+		clk_div = bus_hz / (2500 * 1000 * 2) - 1;
+		if (clk_div < 1)
+			clk_div = 1;
+		if (clk_div > 0x3f)
+			clk_div = 0x3f;
+	}
+
+	/* Enable the MDIO bus by asserting the enable bit and writing
+	 * in the clock config
+	 */
+	temac_indirect_out32(lp, XTE_MC_OFFSET, 1 << 6 | clk_div);
+
+	bus = devm_mdiobus_alloc(&pdev->dev);
+	if (!bus)
+		return -ENOMEM;
+
+	if (np) {
+		of_address_to_resource(np, 0, &res);
+		snprintf(bus->id, MII_BUS_ID_SIZE, "%.8llx",
+			 (unsigned long long)res.start);
+	} else if (pdata) {
+		snprintf(bus->id, MII_BUS_ID_SIZE, "%.8llx",
+			 pdata->mdio_bus_id);
+	}
+
+	bus->priv = lp;
+	bus->name = "Xilinx TEMAC MDIO";
+	bus->read = temac_mdio_read;
+	bus->write = temac_mdio_write;
+	bus->parent = lp->dev;
+
+	lp->mii_bus = bus;
+
+	rc = of_mdiobus_register(bus, np);
+	if (rc)
+		return rc;
+
+	dev_dbg(lp->dev, "MDIO bus registered;  MC:%x\n",
+		temac_indirect_in32(lp, XTE_MC_OFFSET));
+	return 0;
+}
+
+void temac_mdio_teardown(struct temac_local *lp)
+{
+	mdiobus_unregister(lp->mii_bus);
+}
-- 
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