Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 314 insertions, 0 deletions

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_mdio.c b/drivers/net/ethernet/xilinx/xilinx_axienet_mdio.c
new file mode 100644
index 0000000000..2f07fde361
--- /dev/null
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_mdio.c
@@ -0,0 +1,314 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * MDIO bus driver for the Xilinx Axi Ethernet device
+ *
+ * Copyright (c) 2009 Secret Lab Technologies, Ltd.
+ * Copyright (c) 2010 - 2011 Michal Simek <monstr@monstr.eu>
+ * Copyright (c) 2010 - 2011 PetaLogix
+ * Copyright (c) 2019 SED Systems, a division of Calian Ltd.
+ * Copyright (c) 2010 - 2012 Xilinx, Inc. All rights reserved.
+ */
+
+#include <linux/clk.h>
+#include <linux/of_address.h>
+#include <linux/of_mdio.h>
+#include <linux/jiffies.h>
+#include <linux/iopoll.h>
+
+#include "xilinx_axienet.h"
+
+#define DEFAULT_MDIO_FREQ	2500000 /* 2.5 MHz */
+#define DEFAULT_HOST_CLOCK	150000000 /* 150 MHz */
+
+/* Wait till MDIO interface is ready to accept a new transaction.*/
+static int axienet_mdio_wait_until_ready(struct axienet_local *lp)
+{
+	u32 val;
+
+	return readx_poll_timeout(axinet_ior_read_mcr, lp,
+				  val, val & XAE_MDIO_MCR_READY_MASK,
+				  1, 20000);
+}
+
+/* Enable the MDIO MDC. Called prior to a read/write operation */
+static void axienet_mdio_mdc_enable(struct axienet_local *lp)
+{
+	axienet_iow(lp, XAE_MDIO_MC_OFFSET,
+		    ((u32)lp->mii_clk_div | XAE_MDIO_MC_MDIOEN_MASK));
+}
+
+/* Disable the MDIO MDC. Called after a read/write operation*/
+static void axienet_mdio_mdc_disable(struct axienet_local *lp)
+{
+	u32 mc_reg;
+
+	mc_reg = axienet_ior(lp, XAE_MDIO_MC_OFFSET);
+	axienet_iow(lp, XAE_MDIO_MC_OFFSET,
+		    (mc_reg & ~XAE_MDIO_MC_MDIOEN_MASK));
+}
+
+/**
+ * axienet_mdio_read - MDIO interface read function
+ * @bus:	Pointer to mii bus structure
+ * @phy_id:	Address of the PHY device
+ * @reg:	PHY register to read
+ *
+ * Return:	The register contents on success, -ETIMEDOUT on a timeout
+ *
+ * Reads the contents of the requested register from the requested PHY
+ * address by first writing the details into MCR register. After a while
+ * the register MRD is read to obtain the PHY register content.
+ */
+static int axienet_mdio_read(struct mii_bus *bus, int phy_id, int reg)
+{
+	u32 rc;
+	int ret;
+	struct axienet_local *lp = bus->priv;
+
+	axienet_mdio_mdc_enable(lp);
+
+	ret = axienet_mdio_wait_until_ready(lp);
+	if (ret < 0) {
+		axienet_mdio_mdc_disable(lp);
+		return ret;
+	}
+
+	axienet_iow(lp, XAE_MDIO_MCR_OFFSET,
+		    (((phy_id << XAE_MDIO_MCR_PHYAD_SHIFT) &
+		      XAE_MDIO_MCR_PHYAD_MASK) |
+		     ((reg << XAE_MDIO_MCR_REGAD_SHIFT) &
+		      XAE_MDIO_MCR_REGAD_MASK) |
+		     XAE_MDIO_MCR_INITIATE_MASK |
+		     XAE_MDIO_MCR_OP_READ_MASK));
+
+	ret = axienet_mdio_wait_until_ready(lp);
+	if (ret < 0) {
+		axienet_mdio_mdc_disable(lp);
+		return ret;
+	}
+
+	rc = axienet_ior(lp, XAE_MDIO_MRD_OFFSET) & 0x0000FFFF;
+
+	dev_dbg(lp->dev, "axienet_mdio_read(phy_id=%i, reg=%x) == %x\n",
+		phy_id, reg, rc);
+
+	axienet_mdio_mdc_disable(lp);
+	return rc;
+}
+
+/**
+ * axienet_mdio_write - MDIO interface write function
+ * @bus:	Pointer to mii bus structure
+ * @phy_id:	Address of the PHY device
+ * @reg:	PHY register to write to
+ * @val:	Value to be written into the register
+ *
+ * Return:	0 on success, -ETIMEDOUT on a timeout
+ *
+ * Writes the value to the requested register by first writing the value
+ * into MWD register. The MCR register is then appropriately setup
+ * to finish the write operation.
+ */
+static int axienet_mdio_write(struct mii_bus *bus, int phy_id, int reg,
+			      u16 val)
+{
+	int ret;
+	struct axienet_local *lp = bus->priv;
+
+	dev_dbg(lp->dev, "axienet_mdio_write(phy_id=%i, reg=%x, val=%x)\n",
+		phy_id, reg, val);
+
+	axienet_mdio_mdc_enable(lp);
+
+	ret = axienet_mdio_wait_until_ready(lp);
+	if (ret < 0) {
+		axienet_mdio_mdc_disable(lp);
+		return ret;
+	}
+
+	axienet_iow(lp, XAE_MDIO_MWD_OFFSET, (u32)val);
+	axienet_iow(lp, XAE_MDIO_MCR_OFFSET,
+		    (((phy_id << XAE_MDIO_MCR_PHYAD_SHIFT) &
+		      XAE_MDIO_MCR_PHYAD_MASK) |
+		     ((reg << XAE_MDIO_MCR_REGAD_SHIFT) &
+		      XAE_MDIO_MCR_REGAD_MASK) |
+		     XAE_MDIO_MCR_INITIATE_MASK |
+		     XAE_MDIO_MCR_OP_WRITE_MASK));
+
+	ret = axienet_mdio_wait_until_ready(lp);
+	if (ret < 0) {
+		axienet_mdio_mdc_disable(lp);
+		return ret;
+	}
+	axienet_mdio_mdc_disable(lp);
+	return 0;
+}
+
+/**
+ * axienet_mdio_enable - MDIO hardware setup function
+ * @lp:		Pointer to axienet local data structure.
+ * @np:		Pointer to mdio device tree node.
+ *
+ * Return:	0 on success, -ETIMEDOUT on a timeout, -EOVERFLOW on a clock
+ *		divisor overflow.
+ *
+ * Sets up the MDIO interface by initializing the MDIO clock and enabling the
+ * MDIO interface in hardware.
+ **/
+static int axienet_mdio_enable(struct axienet_local *lp, struct device_node *np)
+{
+	u32 mdio_freq = DEFAULT_MDIO_FREQ;
+	u32 host_clock;
+	u32 clk_div;
+	int ret;
+
+	lp->mii_clk_div = 0;
+
+	if (lp->axi_clk) {
+		host_clock = clk_get_rate(lp->axi_clk);
+	} else {
+		struct device_node *np1;
+
+		/* Legacy fallback: detect CPU clock frequency and use as AXI
+		 * bus clock frequency. This only works on certain platforms.
+		 */
+		np1 = of_find_node_by_name(NULL, "cpu");
+		if (!np1) {
+			netdev_warn(lp->ndev, "Could not find CPU device node.\n");
+			host_clock = DEFAULT_HOST_CLOCK;
+		} else {
+			int ret = of_property_read_u32(np1, "clock-frequency",
+						       &host_clock);
+			if (ret) {
+				netdev_warn(lp->ndev, "CPU clock-frequency property not found.\n");
+				host_clock = DEFAULT_HOST_CLOCK;
+			}
+			of_node_put(np1);
+		}
+		netdev_info(lp->ndev, "Setting assumed host clock to %u\n",
+			    host_clock);
+	}
+
+	if (np)
+		of_property_read_u32(np, "clock-frequency", &mdio_freq);
+	if (mdio_freq != DEFAULT_MDIO_FREQ)
+		netdev_info(lp->ndev, "Setting non-standard mdio bus frequency to %u Hz\n",
+			    mdio_freq);
+
+	/* clk_div can be calculated by deriving it from the equation:
+	 * fMDIO = fHOST / ((1 + clk_div) * 2)
+	 *
+	 * Where fMDIO <= 2500000, so we get:
+	 * fHOST / ((1 + clk_div) * 2) <= 2500000
+	 *
+	 * Then we get:
+	 * 1 / ((1 + clk_div) * 2) <= (2500000 / fHOST)
+	 *
+	 * Then we get:
+	 * 1 / (1 + clk_div) <= ((2500000 * 2) / fHOST)
+	 *
+	 * Then we get:
+	 * 1 / (1 + clk_div) <= (5000000 / fHOST)
+	 *
+	 * So:
+	 * (1 + clk_div) >= (fHOST / 5000000)
+	 *
+	 * And finally:
+	 * clk_div >= (fHOST / 5000000) - 1
+	 *
+	 * fHOST can be read from the flattened device tree as property
+	 * "clock-frequency" from the CPU
+	 */
+
+	clk_div = (host_clock / (mdio_freq * 2)) - 1;
+	/* If there is any remainder from the division of
+	 * fHOST / (mdio_freq * 2), then we need to add
+	 * 1 to the clock divisor or we will surely be
+	 * above the requested frequency
+	 */
+	if (host_clock % (mdio_freq * 2))
+		clk_div++;
+
+	/* Check for overflow of mii_clk_div */
+	if (clk_div & ~XAE_MDIO_MC_CLOCK_DIVIDE_MAX) {
+		netdev_warn(lp->ndev, "MDIO clock divisor overflow\n");
+		return -EOVERFLOW;
+	}
+	lp->mii_clk_div = (u8)clk_div;
+
+	netdev_dbg(lp->ndev,
+		   "Setting MDIO clock divisor to %u/%u Hz host clock.\n",
+		   lp->mii_clk_div, host_clock);
+
+	axienet_mdio_mdc_enable(lp);
+
+	ret = axienet_mdio_wait_until_ready(lp);
+	if (ret)
+		axienet_mdio_mdc_disable(lp);
+
+	return ret;
+}
+
+/**
+ * axienet_mdio_setup - MDIO setup function
+ * @lp:		Pointer to axienet local data structure.
+ *
+ * Return:	0 on success, -ETIMEDOUT on a timeout, -EOVERFLOW on a clock
+ *		divisor overflow, -ENOMEM when mdiobus_alloc (to allocate
+ *		memory for mii bus structure) fails.
+ *
+ * Sets up the MDIO interface by initializing the MDIO clock.
+ * Register the MDIO interface.
+ **/
+int axienet_mdio_setup(struct axienet_local *lp)
+{
+	struct device_node *mdio_node;
+	struct mii_bus *bus;
+	int ret;
+
+	bus = mdiobus_alloc();
+	if (!bus)
+		return -ENOMEM;
+
+	snprintf(bus->id, MII_BUS_ID_SIZE, "axienet-%.8llx",
+		 (unsigned long long)lp->regs_start);
+
+	bus->priv = lp;
+	bus->name = "Xilinx Axi Ethernet MDIO";
+	bus->read = axienet_mdio_read;
+	bus->write = axienet_mdio_write;
+	bus->parent = lp->dev;
+	lp->mii_bus = bus;
+
+	mdio_node = of_get_child_by_name(lp->dev->of_node, "mdio");
+	ret = axienet_mdio_enable(lp, mdio_node);
+	if (ret < 0)
+		goto unregister;
+	ret = of_mdiobus_register(bus, mdio_node);
+	if (ret)
+		goto unregister_mdio_enabled;
+	of_node_put(mdio_node);
+	axienet_mdio_mdc_disable(lp);
+	return 0;
+
+unregister_mdio_enabled:
+	axienet_mdio_mdc_disable(lp);
+unregister:
+	of_node_put(mdio_node);
+	mdiobus_free(bus);
+	lp->mii_bus = NULL;
+	return ret;
+}
+
+/**
+ * axienet_mdio_teardown - MDIO remove function
+ * @lp:		Pointer to axienet local data structure.
+ *
+ * Unregisters the MDIO and frees any associate memory for mii bus.
+ */
+void axienet_mdio_teardown(struct axienet_local *lp)
+{
+	mdiobus_unregister(lp->mii_bus);
+	mdiobus_free(lp->mii_bus);
+	lp->mii_bus = NULL;
+}