phy: Add MOXA MDIO driver (b0db7b0c) · Commits · e / devices / android_kernel_sony_msm8998

drivers/net/phy/Kconfig

+7 −0

Original line number	Diff line number	Diff line
		@@ -154,6 +154,13 @@ config MDIO_SUN4I
		interface units of the Allwinner SoC that have an EMAC (A10,
		A12, A10s, etc.)

		config MDIO_MOXART
		tristate "MOXA ART MDIO interface support"
		depends on ARCH_MOXART
		help
		This driver supports the MDIO interface found in the network
		interface units of the MOXA ART SoC

		config MDIO_BUS_MUX
		tristate
		depends on OF_MDIO

drivers/net/phy/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -31,3 +31,4 @@ obj-$(CONFIG_MDIO_BUS_MUX) += mdio-mux.o
		obj-$(CONFIG_MDIO_BUS_MUX_GPIO) += mdio-mux-gpio.o
		obj-$(CONFIG_MDIO_BUS_MUX_MMIOREG) += mdio-mux-mmioreg.o
		obj-$(CONFIG_MDIO_SUN4I) += mdio-sun4i.o
		obj-$(CONFIG_MDIO_MOXART) += mdio-moxart.o

drivers/net/phy/mdio-moxart.c

0 → 100644

+201 −0

Original line number	Diff line number	Diff line
		/* MOXA ART Ethernet (RTL8201CP) MDIO interface driver
		*
		* Copyright (C) 2013 Jonas Jensen <jonas.jensen@gmail.com>
		*
		* This file is licensed under the terms of the GNU General Public
		* License version 2. This program is licensed "as is" without any
		* warranty of any kind, whether express or implied.
		*/

		#include <linux/delay.h>
		#include <linux/init.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/mutex.h>
		#include <linux/of_address.h>
		#include <linux/of_mdio.h>
		#include <linux/phy.h>
		#include <linux/platform_device.h>
		#include <linux/regulator/consumer.h>

		#define REG_PHY_CTRL 0
		#define REG_PHY_WRITE_DATA 4

		/* REG_PHY_CTRL */
		#define MIIWR BIT(27) /* init write sequence (auto cleared)*/
		#define MIIRD BIT(26)
		#define REGAD_MASK 0x3e00000
		#define PHYAD_MASK 0x1f0000
		#define MIIRDATA_MASK 0xffff

		/* REG_PHY_WRITE_DATA */
		#define MIIWDATA_MASK 0xffff

		struct moxart_mdio_data {
		void __iomem *base;
		};

		static int moxart_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
		{
		struct moxart_mdio_data *data = bus->priv;
		u32 ctrl = 0;
		unsigned int count = 5;

		dev_dbg(&bus->dev, "%s\n", __func__);

		ctrl \|= MIIRD \| ((mii_id << 16) & PHYAD_MASK) \|
		((regnum << 21) & REGAD_MASK);

		writel(ctrl, data->base + REG_PHY_CTRL);

		do {
		ctrl = readl(data->base + REG_PHY_CTRL);

		if (!(ctrl & MIIRD))
		return ctrl & MIIRDATA_MASK;

		mdelay(10);
		count--;
		} while (count > 0);

		dev_dbg(&bus->dev, "%s timed out\n", __func__);

		return -ETIMEDOUT;
		}

		static int moxart_mdio_write(struct mii_bus *bus, int mii_id,
		int regnum, u16 value)
		{
		struct moxart_mdio_data *data = bus->priv;
		u32 ctrl = 0;
		unsigned int count = 5;

		dev_dbg(&bus->dev, "%s\n", __func__);

		ctrl \|= MIIWR \| ((mii_id << 16) & PHYAD_MASK) \|
		((regnum << 21) & REGAD_MASK);

		value &= MIIWDATA_MASK;

		writel(value, data->base + REG_PHY_WRITE_DATA);
		writel(ctrl, data->base + REG_PHY_CTRL);

		do {
		ctrl = readl(data->base + REG_PHY_CTRL);

		if (!(ctrl & MIIWR))
		return 0;

		mdelay(10);
		count--;
		} while (count > 0);

		dev_dbg(&bus->dev, "%s timed out\n", __func__);

		return -ETIMEDOUT;
		}

		static int moxart_mdio_reset(struct mii_bus *bus)
		{
		int data, i;

		for (i = 0; i < PHY_MAX_ADDR; i++) {
		data = moxart_mdio_read(bus, i, MII_BMCR);
		if (data < 0)
		continue;

		data \|= BMCR_RESET;
		if (moxart_mdio_write(bus, i, MII_BMCR, data) < 0)
		continue;
		}

		return 0;
		}

		static int moxart_mdio_probe(struct platform_device *pdev)
		{
		struct device_node *np = pdev->dev.of_node;
		struct mii_bus *bus;
		struct moxart_mdio_data *data;
		struct resource *res;
		int ret, i;

		bus = mdiobus_alloc_size(sizeof(*data));
		if (!bus)
		return -ENOMEM;

		bus->name = "MOXA ART Ethernet MII";
		bus->read = &moxart_mdio_read;
		bus->write = &moxart_mdio_write;
		bus->reset = &moxart_mdio_reset;
		snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d-mii", pdev->name, pdev->id);
		bus->parent = &pdev->dev;

		bus->irq = devm_kzalloc(&pdev->dev, sizeof(int) * PHY_MAX_ADDR,
		GFP_KERNEL);
		if (!bus->irq) {
		ret = -ENOMEM;
		goto err_out_free_mdiobus;
		}

		/* Setting PHY_IGNORE_INTERRUPT here even if it has no effect,
		* of_mdiobus_register() sets these PHY_POLL.
		* Ideally, the interrupt from MAC controller could be used to
		* detect link state changes, not polling, i.e. if there was
		* a way phy_driver could set PHY_HAS_INTERRUPT but have that
		* interrupt handled in ethernet drivercode.
		*/
		for (i = 0; i < PHY_MAX_ADDR; i++)
		bus->irq[i] = PHY_IGNORE_INTERRUPT;

		data = bus->priv;
		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		data->base = devm_ioremap_resource(&pdev->dev, res);
		if (IS_ERR(data->base)) {
		ret = PTR_ERR(data->base);
		goto err_out_free_mdiobus;
		}

		ret = of_mdiobus_register(bus, np);
		if (ret < 0)
		goto err_out_free_mdiobus;

		platform_set_drvdata(pdev, bus);

		return 0;

		err_out_free_mdiobus:
		mdiobus_free(bus);
		return ret;
		}

		static int moxart_mdio_remove(struct platform_device *pdev)
		{
		struct mii_bus *bus = platform_get_drvdata(pdev);

		mdiobus_unregister(bus);
		mdiobus_free(bus);

		return 0;
		}

		static const struct of_device_id moxart_mdio_dt_ids[] = {
		{ .compatible = "moxa,moxart-mdio" },
		{ }
		};
		MODULE_DEVICE_TABLE(of, moxart_mdio_dt_ids);

		static struct platform_driver moxart_mdio_driver = {
		.probe = moxart_mdio_probe,
		.remove = moxart_mdio_remove,
		.driver = {
		.name = "moxart-mdio",
		.of_match_table = moxart_mdio_dt_ids,
		},
		};

		module_platform_driver(moxart_mdio_driver);

		MODULE_DESCRIPTION("MOXA ART MDIO interface driver");
		MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");
		MODULE_LICENSE("GPL");