net: mdio: Add BCM6368 MDIO mux bus controller (e2397567) · Commits · EulixOS / Software / Kernel

drivers/net/mdio/Kconfig

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		@@ -200,6 +200,17 @@ config MDIO_BUS_MUX_MESON_G12A
		the amlogic g12a SoC. The multiplexers connects either the external
		or the internal MDIO bus to the parent bus.

		config MDIO_BUS_MUX_BCM6368
		tristate "Broadcom BCM6368 MDIO bus multiplexers"
		depends on OF && OF_MDIO && (BMIPS_GENERIC \|\| COMPILE_TEST)
		select MDIO_BUS_MUX
		default BMIPS_GENERIC
		help
		This module provides a driver for MDIO bus multiplexers found in
		BCM6368 based Broadcom SoCs. This multiplexer connects one of several
		child MDIO bus to a parent bus. Buses could be internal as well as
		external and selection logic lies inside the same multiplexer.

		config MDIO_BUS_MUX_BCM_IPROC
		tristate "Broadcom iProc based MDIO bus multiplexers"
		depends on OF && OF_MDIO && (ARCH_BCM_IPROC \|\| COMPILE_TEST)

drivers/net/mdio/Makefile

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		@@ -22,6 +22,7 @@ obj-$(CONFIG_MDIO_THUNDER) += mdio-thunder.o
		obj-$(CONFIG_MDIO_XGENE) += mdio-xgene.o

		obj-$(CONFIG_MDIO_BUS_MUX) += mdio-mux.o
		obj-$(CONFIG_MDIO_BUS_MUX_BCM6368) += mdio-mux-bcm6368.o
		obj-$(CONFIG_MDIO_BUS_MUX_BCM_IPROC) += mdio-mux-bcm-iproc.o
		obj-$(CONFIG_MDIO_BUS_MUX_GPIO) += mdio-mux-gpio.o
		obj-$(CONFIG_MDIO_BUS_MUX_MESON_G12A) += mdio-mux-meson-g12a.o

drivers/net/mdio/mdio-mux-bcm6368.c

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		// SPDX-License-Identifier: GPL-2.0+
		/*
		* Broadcom BCM6368 mdiomux bus controller driver
		*
		* Copyright (C) 2021 Álvaro Fernández Rojas <noltari@gmail.com>
		*/

		#include <linux/delay.h>
		#include <linux/io.h>
		#include <linux/kernel.h>
		#include <linux/mdio-mux.h>
		#include <linux/module.h>
		#include <linux/of.h>
		#include <linux/of_platform.h>
		#include <linux/of_mdio.h>
		#include <linux/phy.h>
		#include <linux/platform_device.h>
		#include <linux/sched.h>

		#define MDIOC_REG 0x0
		#define MDIOC_EXT_MASK BIT(16)
		#define MDIOC_REG_SHIFT 20
		#define MDIOC_PHYID_SHIFT 25
		#define MDIOC_RD_MASK BIT(30)
		#define MDIOC_WR_MASK BIT(31)

		#define MDIOD_REG 0x4

		struct bcm6368_mdiomux_desc {
		void *mux_handle;
		void __iomem *base;
		struct device *dev;
		struct mii_bus *mii_bus;
		int ext_phy;
		};

		static int bcm6368_mdiomux_read(struct mii_bus *bus, int phy_id, int loc)
		{
		struct bcm6368_mdiomux_desc *md = bus->priv;
		uint32_t reg;
		int ret;

		__raw_writel(0, md->base + MDIOC_REG);

		reg = MDIOC_RD_MASK \|
		(phy_id << MDIOC_PHYID_SHIFT) \|
		(loc << MDIOC_REG_SHIFT);
		if (md->ext_phy)
		reg \|= MDIOC_EXT_MASK;

		__raw_writel(reg, md->base + MDIOC_REG);
		udelay(50);
		ret = __raw_readw(md->base + MDIOD_REG);

		return ret;
		}

		static int bcm6368_mdiomux_write(struct mii_bus *bus, int phy_id, int loc,
		uint16_t val)
		{
		struct bcm6368_mdiomux_desc *md = bus->priv;
		uint32_t reg;

		__raw_writel(0, md->base + MDIOC_REG);

		reg = MDIOC_WR_MASK \|
		(phy_id << MDIOC_PHYID_SHIFT) \|
		(loc << MDIOC_REG_SHIFT);
		if (md->ext_phy)
		reg \|= MDIOC_EXT_MASK;
		reg \|= val;

		__raw_writel(reg, md->base + MDIOC_REG);
		udelay(50);

		return 0;
		}

		static int bcm6368_mdiomux_switch_fn(int current_child, int desired_child,
		void *data)
		{
		struct bcm6368_mdiomux_desc *md = data;

		md->ext_phy = desired_child;

		return 0;
		}

		static int bcm6368_mdiomux_probe(struct platform_device *pdev)
		{
		struct bcm6368_mdiomux_desc *md;
		struct mii_bus *bus;
		struct resource *res;
		int rc;

		md = devm_kzalloc(&pdev->dev, sizeof(*md), GFP_KERNEL);
		if (!md)
		return -ENOMEM;
		md->dev = &pdev->dev;

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (!res)
		return -EINVAL;

		/*
		* Just ioremap, as this MDIO block is usually integrated into an
		* Ethernet MAC controller register range
		*/
		md->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
		if (!md->base) {
		dev_err(&pdev->dev, "failed to ioremap register\n");
		return -ENOMEM;
		}

		md->mii_bus = devm_mdiobus_alloc(&pdev->dev);
		if (!md->mii_bus) {
		dev_err(&pdev->dev, "mdiomux bus alloc failed\n");
		return ENOMEM;
		}

		bus = md->mii_bus;
		bus->priv = md;
		bus->name = "BCM6368 MDIO mux bus";
		snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d", pdev->name, pdev->id);
		bus->parent = &pdev->dev;
		bus->read = bcm6368_mdiomux_read;
		bus->write = bcm6368_mdiomux_write;
		bus->phy_mask = 0x3f;
		bus->dev.of_node = pdev->dev.of_node;

		rc = mdiobus_register(bus);
		if (rc) {
		dev_err(&pdev->dev, "mdiomux registration failed\n");
		return rc;
		}

		platform_set_drvdata(pdev, md);

		rc = mdio_mux_init(md->dev, md->dev->of_node,
		bcm6368_mdiomux_switch_fn, &md->mux_handle, md,
		md->mii_bus);
		if (rc) {
		dev_info(md->dev, "mdiomux initialization failed\n");
		goto out_register;
		}

		dev_info(&pdev->dev, "Broadcom BCM6368 MDIO mux bus\n");

		return 0;

		out_register:
		mdiobus_unregister(bus);
		return rc;
		}

		static int bcm6368_mdiomux_remove(struct platform_device *pdev)
		{
		struct bcm6368_mdiomux_desc *md = platform_get_drvdata(pdev);

		mdio_mux_uninit(md->mux_handle);
		mdiobus_unregister(md->mii_bus);

		return 0;
		}

		static const struct of_device_id bcm6368_mdiomux_ids[] = {
		{ .compatible = "brcm,bcm6368-mdio-mux", },
		{ /* sentinel */ }
		};
		MODULE_DEVICE_TABLE(of, bcm6368_mdiomux_ids);

		static struct platform_driver bcm6368_mdiomux_driver = {
		.driver = {
		.name = "bcm6368-mdio-mux",
		.of_match_table = bcm6368_mdiomux_ids,
		},
		.probe = bcm6368_mdiomux_probe,
		.remove = bcm6368_mdiomux_remove,
		};
		module_platform_driver(bcm6368_mdiomux_driver);

		MODULE_AUTHOR("Álvaro Fernández Rojas <noltari@gmail.com>");
		MODULE_DESCRIPTION("BCM6368 mdiomux bus controller driver");
		MODULE_LICENSE("GPL v2");