Commit caaa71fa authored by Ansuel Smith's avatar Ansuel Smith Committed by David S. Miller
Browse files

net: mdio: add ipq8064 mdio driver 



Currently ipq806x soc use generic bitbang driver to
comunicate with the gmac ethernet interface.
Add a dedicated driver created by chunkeey to fix this.

Co-developed-by: default avatarChristian Lamparter <chunkeey@gmail.com>
Signed-off-by: default avatarChristian Lamparter <chunkeey@gmail.com>
Signed-off-by: default avatarAnsuel Smith <ansuelsmth@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 425c075d

drivers/net/phy/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -157,6 +157,14 @@ config MDIO_I2C 


	  This is library mode.



config MDIO_IPQ8064

	tristate "Qualcomm IPQ8064 MDIO interface support"

	depends on HAS_IOMEM && OF_MDIO

	depends on MFD_SYSCON

	help

	  This driver supports the MDIO interface found in the network

	  interface units of the IPQ8064 SoC



config MDIO_MOXART

	tristate "MOXA ART MDIO interface support"

	depends on ARCH_MOXART || COMPILE_TEST

drivers/net/phy/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ obj-$(CONFIG_MDIO_CAVIUM) += mdio-cavium.o 
obj-$(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_IPQ8064)	+= mdio-ipq8064.o

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

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

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

drivers/net/phy/mdio-ipq8064.c

0 → 100644
+166 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/* Qualcomm IPQ8064 MDIO interface driver

 *

 * Copyright (C) 2019 Christian Lamparter <chunkeey@gmail.com>

 * Copyright (C) 2020 Ansuel Smith <ansuelsmth@gmail.com>

 */



#include <linux/delay.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/regmap.h>

#include <linux/of_mdio.h>

#include <linux/phy.h>

#include <linux/platform_device.h>

#include <linux/mfd/syscon.h>



/* MII address register definitions */

#define MII_ADDR_REG_ADDR                       0x10

#define MII_BUSY                                BIT(0)

#define MII_WRITE                               BIT(1)

#define MII_CLKRANGE_60_100M                    (0 << 2)

#define MII_CLKRANGE_100_150M                   (1 << 2)

#define MII_CLKRANGE_20_35M                     (2 << 2)

#define MII_CLKRANGE_35_60M                     (3 << 2)

#define MII_CLKRANGE_150_250M                   (4 << 2)

#define MII_CLKRANGE_250_300M                   (5 << 2)

#define MII_CLKRANGE_MASK			GENMASK(4, 2)

#define MII_REG_SHIFT				6

#define MII_REG_MASK				GENMASK(10, 6)

#define MII_ADDR_SHIFT				11

#define MII_ADDR_MASK				GENMASK(15, 11)



#define MII_DATA_REG_ADDR                       0x14



#define MII_MDIO_DELAY_USEC                     (1000)

#define MII_MDIO_RETRY_MSEC                     (10)



struct ipq8064_mdio {

	struct regmap *base; /* NSS_GMAC0_BASE */

};



static int

ipq8064_mdio_wait_busy(struct ipq8064_mdio *priv)

{

	u32 busy;



	return regmap_read_poll_timeout(priv->base, MII_ADDR_REG_ADDR, busy,

					!(busy & MII_BUSY), MII_MDIO_DELAY_USEC,

					MII_MDIO_RETRY_MSEC * USEC_PER_MSEC);

}



static int

ipq8064_mdio_read(struct mii_bus *bus, int phy_addr, int reg_offset)

{

	u32 miiaddr = MII_BUSY | MII_CLKRANGE_250_300M;

	struct ipq8064_mdio *priv = bus->priv;

	u32 ret_val;

	int err;



	/* Reject clause 45 */

	if (reg_offset & MII_ADDR_C45)

		return -EOPNOTSUPP;



	miiaddr |= ((phy_addr << MII_ADDR_SHIFT) & MII_ADDR_MASK) |

		   ((reg_offset << MII_REG_SHIFT) & MII_REG_MASK);



	regmap_write(priv->base, MII_ADDR_REG_ADDR, miiaddr);

	usleep_range(8, 10);



	err = ipq8064_mdio_wait_busy(priv);

	if (err)

		return err;



	regmap_read(priv->base, MII_DATA_REG_ADDR, &ret_val);

	return (int)ret_val;

}



static int

ipq8064_mdio_write(struct mii_bus *bus, int phy_addr, int reg_offset, u16 data)

{

	u32 miiaddr = MII_WRITE | MII_BUSY | MII_CLKRANGE_250_300M;

	struct ipq8064_mdio *priv = bus->priv;



	/* Reject clause 45 */

	if (reg_offset & MII_ADDR_C45)

		return -EOPNOTSUPP;



	regmap_write(priv->base, MII_DATA_REG_ADDR, data);



	miiaddr |= ((phy_addr << MII_ADDR_SHIFT) & MII_ADDR_MASK) |

		   ((reg_offset << MII_REG_SHIFT) & MII_REG_MASK);



	regmap_write(priv->base, MII_ADDR_REG_ADDR, miiaddr);

	usleep_range(8, 10);



	return ipq8064_mdio_wait_busy(priv);

}



static int

ipq8064_mdio_probe(struct platform_device *pdev)

{

	struct device_node *np = pdev->dev.of_node;

	struct ipq8064_mdio *priv;

	struct mii_bus *bus;

	int ret;



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

	if (!bus)

		return -ENOMEM;



	bus->name = "ipq8064_mdio_bus";

	bus->read = ipq8064_mdio_read;

	bus->write = ipq8064_mdio_write;

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

	bus->parent = &pdev->dev;



	priv = bus->priv;

	priv->base = device_node_to_regmap(np);

	if (IS_ERR(priv->base)) {

		if (priv->base == ERR_PTR(-EPROBE_DEFER))

			return -EPROBE_DEFER;



		dev_err(&pdev->dev, "error getting device regmap, error=%pe\n",

			priv->base);

		return PTR_ERR(priv->base);

	}



	ret = of_mdiobus_register(bus, np);

	if (ret)

		return ret;



	platform_set_drvdata(pdev, bus);

	return 0;

}



static int

ipq8064_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 ipq8064_mdio_dt_ids[] = {

	{ .compatible = "qcom,ipq8064-mdio" },

	{ }

};

MODULE_DEVICE_TABLE(of, ipq8064_mdio_dt_ids);



static struct platform_driver ipq8064_mdio_driver = {

	.probe = ipq8064_mdio_probe,

	.remove = ipq8064_mdio_remove,

	.driver = {

		.name = "ipq8064-mdio",

		.of_match_table = ipq8064_mdio_dt_ids,

	},

};



module_platform_driver(ipq8064_mdio_driver);



MODULE_DESCRIPTION("Qualcomm IPQ8064 MDIO interface driver");

MODULE_AUTHOR("Christian Lamparter <chunkeey@gmail.com>");

MODULE_AUTHOR("Ansuel Smith <ansuelsmth@gmail.com>");

MODULE_LICENSE("GPL");