Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 284 insertions, 0 deletions

diff --git a/drivers/net/mdio/mdio-ipq4019.c b/drivers/net/mdio/mdio-ipq4019.c
new file mode 100644
index 000000000..4eba5a910
--- /dev/null
+++ b/drivers/net/mdio/mdio-ipq4019.c
@@ -0,0 +1,284 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/* Copyright (c) 2015, The Linux Foundation. All rights reserved. */
+/* Copyright (c) 2020 Sartura Ltd. */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_mdio.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+
+#define MDIO_MODE_REG				0x40
+#define MDIO_ADDR_REG				0x44
+#define MDIO_DATA_WRITE_REG			0x48
+#define MDIO_DATA_READ_REG			0x4c
+#define MDIO_CMD_REG				0x50
+#define MDIO_CMD_ACCESS_BUSY		BIT(16)
+#define MDIO_CMD_ACCESS_START		BIT(8)
+#define MDIO_CMD_ACCESS_CODE_READ	0
+#define MDIO_CMD_ACCESS_CODE_WRITE	1
+#define MDIO_CMD_ACCESS_CODE_C45_ADDR	0
+#define MDIO_CMD_ACCESS_CODE_C45_WRITE	1
+#define MDIO_CMD_ACCESS_CODE_C45_READ	2
+
+/* 0 = Clause 22, 1 = Clause 45 */
+#define MDIO_MODE_C45				BIT(8)
+
+#define IPQ4019_MDIO_TIMEOUT	10000
+#define IPQ4019_MDIO_SLEEP		10
+
+/* MDIO clock source frequency is fixed to 100M */
+#define IPQ_MDIO_CLK_RATE	100000000
+
+#define IPQ_PHY_SET_DELAY_US	100000
+
+struct ipq4019_mdio_data {
+	void __iomem	*membase;
+	void __iomem *eth_ldo_rdy;
+	struct clk *mdio_clk;
+};
+
+static int ipq4019_mdio_wait_busy(struct mii_bus *bus)
+{
+	struct ipq4019_mdio_data *priv = bus->priv;
+	unsigned int busy;
+
+	return readl_poll_timeout(priv->membase + MDIO_CMD_REG, busy,
+				  (busy & MDIO_CMD_ACCESS_BUSY) == 0,
+				  IPQ4019_MDIO_SLEEP, IPQ4019_MDIO_TIMEOUT);
+}
+
+static int ipq4019_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
+{
+	struct ipq4019_mdio_data *priv = bus->priv;
+	unsigned int data;
+	unsigned int cmd;
+
+	if (ipq4019_mdio_wait_busy(bus))
+		return -ETIMEDOUT;
+
+	/* Clause 45 support */
+	if (regnum & MII_ADDR_C45) {
+		unsigned int mmd = (regnum >> 16) & 0x1F;
+		unsigned int reg = regnum & 0xFFFF;
+
+		/* Enter Clause 45 mode */
+		data = readl(priv->membase + MDIO_MODE_REG);
+
+		data |= MDIO_MODE_C45;
+
+		writel(data, priv->membase + MDIO_MODE_REG);
+
+		/* issue the phy address and mmd */
+		writel((mii_id << 8) | mmd, priv->membase + MDIO_ADDR_REG);
+
+		/* issue reg */
+		writel(reg, priv->membase + MDIO_DATA_WRITE_REG);
+
+		cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_ADDR;
+	} else {
+		/* Enter Clause 22 mode */
+		data = readl(priv->membase + MDIO_MODE_REG);
+
+		data &= ~MDIO_MODE_C45;
+
+		writel(data, priv->membase + MDIO_MODE_REG);
+
+		/* issue the phy address and reg */
+		writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG);
+
+		cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_READ;
+	}
+
+	/* issue read command */
+	writel(cmd, priv->membase + MDIO_CMD_REG);
+
+	/* Wait read complete */
+	if (ipq4019_mdio_wait_busy(bus))
+		return -ETIMEDOUT;
+
+	if (regnum & MII_ADDR_C45) {
+		cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_READ;
+
+		writel(cmd, priv->membase + MDIO_CMD_REG);
+
+		if (ipq4019_mdio_wait_busy(bus))
+			return -ETIMEDOUT;
+	}
+
+	/* Read and return data */
+	return readl(priv->membase + MDIO_DATA_READ_REG);
+}
+
+static int ipq4019_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
+							 u16 value)
+{
+	struct ipq4019_mdio_data *priv = bus->priv;
+	unsigned int data;
+	unsigned int cmd;
+
+	if (ipq4019_mdio_wait_busy(bus))
+		return -ETIMEDOUT;
+
+	/* Clause 45 support */
+	if (regnum & MII_ADDR_C45) {
+		unsigned int mmd = (regnum >> 16) & 0x1F;
+		unsigned int reg = regnum & 0xFFFF;
+
+		/* Enter Clause 45 mode */
+		data = readl(priv->membase + MDIO_MODE_REG);
+
+		data |= MDIO_MODE_C45;
+
+		writel(data, priv->membase + MDIO_MODE_REG);
+
+		/* issue the phy address and mmd */
+		writel((mii_id << 8) | mmd, priv->membase + MDIO_ADDR_REG);
+
+		/* issue reg */
+		writel(reg, priv->membase + MDIO_DATA_WRITE_REG);
+
+		cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_ADDR;
+
+		writel(cmd, priv->membase + MDIO_CMD_REG);
+
+		if (ipq4019_mdio_wait_busy(bus))
+			return -ETIMEDOUT;
+	} else {
+		/* Enter Clause 22 mode */
+		data = readl(priv->membase + MDIO_MODE_REG);
+
+		data &= ~MDIO_MODE_C45;
+
+		writel(data, priv->membase + MDIO_MODE_REG);
+
+		/* issue the phy address and reg */
+		writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG);
+	}
+
+	/* issue write data */
+	writel(value, priv->membase + MDIO_DATA_WRITE_REG);
+
+	/* issue write command */
+	if (regnum & MII_ADDR_C45)
+		cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_WRITE;
+	else
+		cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_WRITE;
+
+	writel(cmd, priv->membase + MDIO_CMD_REG);
+
+	/* Wait write complete */
+	if (ipq4019_mdio_wait_busy(bus))
+		return -ETIMEDOUT;
+
+	return 0;
+}
+
+static int ipq_mdio_reset(struct mii_bus *bus)
+{
+	struct ipq4019_mdio_data *priv = bus->priv;
+	u32 val;
+	int ret;
+
+	/* To indicate CMN_PLL that ethernet_ldo has been ready if platform resource 1
+	 * is specified in the device tree.
+	 */
+	if (priv->eth_ldo_rdy) {
+		val = readl(priv->eth_ldo_rdy);
+		val |= BIT(0);
+		writel(val, priv->eth_ldo_rdy);
+		fsleep(IPQ_PHY_SET_DELAY_US);
+	}
+
+	/* Configure MDIO clock source frequency if clock is specified in the device tree */
+	ret = clk_set_rate(priv->mdio_clk, IPQ_MDIO_CLK_RATE);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(priv->mdio_clk);
+	if (ret == 0)
+		mdelay(10);
+
+	return ret;
+}
+
+static int ipq4019_mdio_probe(struct platform_device *pdev)
+{
+	struct ipq4019_mdio_data *priv;
+	struct mii_bus *bus;
+	struct resource *res;
+	int ret;
+
+	bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*priv));
+	if (!bus)
+		return -ENOMEM;
+
+	priv = bus->priv;
+
+	priv->membase = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->membase))
+		return PTR_ERR(priv->membase);
+
+	priv->mdio_clk = devm_clk_get_optional(&pdev->dev, "gcc_mdio_ahb_clk");
+	if (IS_ERR(priv->mdio_clk))
+		return PTR_ERR(priv->mdio_clk);
+
+	/* The platform resource is provided on the chipset IPQ5018 */
+	/* This resource is optional */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res)
+		priv->eth_ldo_rdy = devm_ioremap_resource(&pdev->dev, res);
+
+	bus->name = "ipq4019_mdio";
+	bus->read = ipq4019_mdio_read;
+	bus->write = ipq4019_mdio_write;
+	bus->reset = ipq_mdio_reset;
+	bus->parent = &pdev->dev;
+	snprintf(bus->id, MII_BUS_ID_SIZE, "%s%d", pdev->name, pdev->id);
+
+	ret = of_mdiobus_register(bus, pdev->dev.of_node);
+	if (ret) {
+		dev_err(&pdev->dev, "Cannot register MDIO bus!\n");
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, bus);
+
+	return 0;
+}
+
+static int ipq4019_mdio_remove(struct platform_device *pdev)
+{
+	struct mii_bus *bus = platform_get_drvdata(pdev);
+
+	mdiobus_unregister(bus);
+
+	return 0;
+}
+
+static const struct of_device_id ipq4019_mdio_dt_ids[] = {
+	{ .compatible = "qcom,ipq4019-mdio" },
+	{ .compatible = "qcom,ipq5018-mdio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ipq4019_mdio_dt_ids);
+
+static struct platform_driver ipq4019_mdio_driver = {
+	.probe = ipq4019_mdio_probe,
+	.remove = ipq4019_mdio_remove,
+	.driver = {
+		.name = "ipq4019-mdio",
+		.of_match_table = ipq4019_mdio_dt_ids,
+	},
+};
+
+module_platform_driver(ipq4019_mdio_driver);
+
+MODULE_DESCRIPTION("ipq4019 MDIO interface driver");
+MODULE_AUTHOR("Qualcomm Atheros");
+MODULE_LICENSE("Dual BSD/GPL");