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Commit 542671fe authored by Alexandre Belloni's avatar Alexandre Belloni Committed by David S. Miller
Browse files

net: phy: mscc-miim: Add MDIO driver 



Add a driver for the Microsemi MII Management controller (MIIM) found on
Microsemi SoCs.
On Ocelot, there are two controllers, one is connected to the internal
PHYs, the other one can communicate with external PHYs.

Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
Reviewed-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cd1436a2

drivers/net/phy/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -123,6 +123,13 @@ config MDIO_MOXART 
	  This driver supports the MDIO interface found in the network

	  interface units of the MOXA ART SoC



config MDIO_MSCC_MIIM

	tristate "Microsemi MIIM interface support"

	depends on HAS_IOMEM

	help

	  This driver supports the MIIM (MDIO) interface found in the network

	  switches of the Microsemi SoCs



config MDIO_OCTEON

	tristate "Octeon and some ThunderX SOCs MDIO buses"

	depends on 64BIT

drivers/net/phy/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -34,6 +34,7 @@ obj-$(CONFIG_MDIO_GPIO) += mdio-gpio.o 
obj-$(CONFIG_MDIO_HISI_FEMAC)	+= mdio-hisi-femac.o

obj-$(CONFIG_MDIO_I2C)		+= mdio-i2c.o

obj-$(CONFIG_MDIO_MOXART)	+= mdio-moxart.o

obj-$(CONFIG_MDIO_MSCC_MIIM)	+= mdio-mscc-miim.o

obj-$(CONFIG_MDIO_OCTEON)	+= mdio-octeon.o

obj-$(CONFIG_MDIO_SUN4I)	+= mdio-sun4i.o

obj-$(CONFIG_MDIO_THUNDER)	+= mdio-thunder.o

drivers/net/phy/mdio-mscc-miim.c

0 → 100644
+197 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: (GPL-2.0 OR MIT)

/*

 * Driver for the MDIO interface of Microsemi network switches.

 *

 * Author: Alexandre Belloni <alexandre.belloni@bootlin.com>

 * Copyright (c) 2017 Microsemi Corporation

 */



#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/phy.h>

#include <linux/platform_device.h>

#include <linux/bitops.h>

#include <linux/io.h>

#include <linux/iopoll.h>

#include <linux/of_mdio.h>



#define MSCC_MIIM_REG_STATUS		0x0

#define		MSCC_MIIM_STATUS_STAT_BUSY	BIT(3)

#define MSCC_MIIM_REG_CMD		0x8

#define		MSCC_MIIM_CMD_OPR_WRITE		BIT(1)

#define		MSCC_MIIM_CMD_OPR_READ		BIT(2)

#define		MSCC_MIIM_CMD_WRDATA_SHIFT	4

#define		MSCC_MIIM_CMD_REGAD_SHIFT	20

#define		MSCC_MIIM_CMD_PHYAD_SHIFT	25

#define		MSCC_MIIM_CMD_VLD		BIT(31)

#define MSCC_MIIM_REG_DATA		0xC

#define		MSCC_MIIM_DATA_ERROR		(BIT(16) | BIT(17))



#define MSCC_PHY_REG_PHY_CFG	0x0

#define		PHY_CFG_PHY_ENA		(BIT(0) | BIT(1) | BIT(2) | BIT(3))

#define		PHY_CFG_PHY_COMMON_RESET BIT(4)

#define		PHY_CFG_PHY_RESET	(BIT(5) | BIT(6) | BIT(7) | BIT(8))

#define MSCC_PHY_REG_PHY_STATUS	0x4



struct mscc_miim_dev {

	void __iomem *regs;

	void __iomem *phy_regs;

};



static int mscc_miim_wait_ready(struct mii_bus *bus)

{

	struct mscc_miim_dev *miim = bus->priv;

	u32 val;



	readl_poll_timeout(miim->regs + MSCC_MIIM_REG_STATUS, val,

			   !(val & MSCC_MIIM_STATUS_STAT_BUSY), 100, 250000);

	if (val & MSCC_MIIM_STATUS_STAT_BUSY)

		return -ETIMEDOUT;



	return 0;

}



static int mscc_miim_read(struct mii_bus *bus, int mii_id, int regnum)

{

	struct mscc_miim_dev *miim = bus->priv;

	u32 val;

	int ret;



	ret = mscc_miim_wait_ready(bus);

	if (ret)

		goto out;



	writel(MSCC_MIIM_CMD_VLD | (mii_id << MSCC_MIIM_CMD_PHYAD_SHIFT) |

	       (regnum << MSCC_MIIM_CMD_REGAD_SHIFT) | MSCC_MIIM_CMD_OPR_READ,

	       miim->regs + MSCC_MIIM_REG_CMD);



	ret = mscc_miim_wait_ready(bus);

	if (ret)

		goto out;



	val = readl(miim->regs + MSCC_MIIM_REG_DATA);

	if (val & MSCC_MIIM_DATA_ERROR) {

		ret = -EIO;

		goto out;

	}



	ret = val & 0xFFFF;

out:

	return ret;

}



static int mscc_miim_write(struct mii_bus *bus, int mii_id,

			   int regnum, u16 value)

{

	struct mscc_miim_dev *miim = bus->priv;

	int ret;



	ret = mscc_miim_wait_ready(bus);

	if (ret < 0)

		goto out;



	writel(MSCC_MIIM_CMD_VLD | (mii_id << MSCC_MIIM_CMD_PHYAD_SHIFT) |

	       (regnum << MSCC_MIIM_CMD_REGAD_SHIFT) |

	       (value << MSCC_MIIM_CMD_WRDATA_SHIFT) |

	       MSCC_MIIM_CMD_OPR_WRITE,

	       miim->regs + MSCC_MIIM_REG_CMD);



out:

	return ret;

}



static int mscc_miim_reset(struct mii_bus *bus)

{

	struct mscc_miim_dev *miim = bus->priv;



	if (miim->phy_regs) {

		writel(0, miim->phy_regs + MSCC_PHY_REG_PHY_CFG);

		writel(0x1ff, miim->phy_regs + MSCC_PHY_REG_PHY_CFG);

		mdelay(500);

	}



	return 0;

}



static int mscc_miim_probe(struct platform_device *pdev)

{

	struct resource *res;

	struct mii_bus *bus;

	struct mscc_miim_dev *dev;

	int ret;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!res)

		return -ENODEV;



	bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*dev));

	if (!bus)

		return -ENOMEM;



	bus->name = "mscc_miim";

	bus->read = mscc_miim_read;

	bus->write = mscc_miim_write;

	bus->reset = mscc_miim_reset;

	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev));

	bus->parent = &pdev->dev;



	dev = bus->priv;

	dev->regs = devm_ioremap_resource(&pdev->dev, res);

	if (IS_ERR(dev->regs)) {

		dev_err(&pdev->dev, "Unable to map MIIM registers\n");

		return PTR_ERR(dev->regs);

	}



	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);

	if (res) {

		dev->phy_regs = devm_ioremap_resource(&pdev->dev, res);

		if (IS_ERR(dev->phy_regs)) {

			dev_err(&pdev->dev, "Unable to map internal phy registers\n");

			return PTR_ERR(dev->phy_regs);

		}

	}



	if (pdev->dev.of_node)

		ret = of_mdiobus_register(bus, pdev->dev.of_node);

	else

		ret = mdiobus_register(bus);



	if (ret < 0) {

		dev_err(&pdev->dev, "Cannot register MDIO bus (%d)\n", ret);

		return ret;

	}



	platform_set_drvdata(pdev, bus);



	return 0;

}



static int mscc_miim_remove(struct platform_device *pdev)

{

	struct mii_bus *bus = platform_get_drvdata(pdev);



	mdiobus_unregister(bus);



	return 0;

}



static const struct of_device_id mscc_miim_match[] = {

	{ .compatible = "mscc,ocelot-miim" },

	{ }

};

MODULE_DEVICE_TABLE(of, mscc_miim_match);



static struct platform_driver mscc_miim_driver = {

	.probe = mscc_miim_probe,

	.remove = mscc_miim_remove,

	.driver = {

		.name = "mscc-miim",

		.of_match_table = mscc_miim_match,

	},

};



module_platform_driver(mscc_miim_driver);



MODULE_DESCRIPTION("Microsemi MIIM driver");

MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");

MODULE_LICENSE("Dual MIT/GPL");