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Release 4.7 drivers/net/phy/dp83867.c

Directory: drivers/net/phy
/*
 * Driver for the Texas Instruments DP83867 PHY
 *
 * Copyright (C) 2015 Texas Instruments Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/ethtool.h>
#include <linux/kernel.h>
#include <linux/mii.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/phy.h>

#include <dt-bindings/net/ti-dp83867.h>


#define DP83867_PHY_ID		0x2000a231

#define DP83867_DEVADDR		0x1f


#define MII_DP83867_PHYCTRL	0x10

#define MII_DP83867_MICR	0x12

#define MII_DP83867_ISR		0x13

#define DP83867_CTRL		0x1f

/* Extended Registers */

#define DP83867_RGMIICTL	0x0032

#define DP83867_RGMIIDCTL	0x0086


#define DP83867_SW_RESET	BIT(15)

#define DP83867_SW_RESTART	BIT(14)

/* MICR Interrupt bits */

#define MII_DP83867_MICR_AN_ERR_INT_EN		BIT(15)

#define MII_DP83867_MICR_SPEED_CHNG_INT_EN	BIT(14)

#define MII_DP83867_MICR_DUP_MODE_CHNG_INT_EN	BIT(13)

#define MII_DP83867_MICR_PAGE_RXD_INT_EN	BIT(12)

#define MII_DP83867_MICR_AUTONEG_COMP_INT_EN	BIT(11)

#define MII_DP83867_MICR_LINK_STS_CHNG_INT_EN	BIT(10)

#define MII_DP83867_MICR_FALSE_CARRIER_INT_EN	BIT(8)

#define MII_DP83867_MICR_SLEEP_MODE_CHNG_INT_EN	BIT(4)

#define MII_DP83867_MICR_WOL_INT_EN		BIT(3)

#define MII_DP83867_MICR_XGMII_ERR_INT_EN	BIT(2)

#define MII_DP83867_MICR_POL_CHNG_INT_EN	BIT(1)

#define MII_DP83867_MICR_JABBER_INT_EN		BIT(0)

/* RGMIICTL bits */

#define DP83867_RGMII_TX_CLK_DELAY_EN		BIT(1)

#define DP83867_RGMII_RX_CLK_DELAY_EN		BIT(0)

/* PHY CTRL bits */

#define DP83867_PHYCR_FIFO_DEPTH_SHIFT		14

#define DP83867_PHYCR_FIFO_DEPTH_MASK		(3 << 14)

/* RGMIIDCTL bits */

#define DP83867_RGMII_TX_CLK_DELAY_SHIFT	4


struct dp83867_private {
	
int rx_id_delay;
	
int tx_id_delay;
	
int fifo_depth;
};




static int dp83867_ack_interrupt(struct phy_device *phydev)
{
	int err = phy_read(phydev, MII_DP83867_ISR);

	if (err < 0)
		return err;

	return 0;
}


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static int dp83867_config_intr(struct phy_device *phydev)
{
	int micr_status;

	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
		micr_status = phy_read(phydev, MII_DP83867_MICR);
		if (micr_status < 0)
			return micr_status;

		micr_status |=
			(MII_DP83867_MICR_AN_ERR_INT_EN |
			MII_DP83867_MICR_SPEED_CHNG_INT_EN |
			MII_DP83867_MICR_DUP_MODE_CHNG_INT_EN |
			MII_DP83867_MICR_SLEEP_MODE_CHNG_INT_EN);

		return phy_write(phydev, MII_DP83867_MICR, micr_status);
	}

	micr_status = 0x0;
	return phy_write(phydev, MII_DP83867_MICR, micr_status);
}


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#ifdef CONFIG_OF_MDIO



static int dp83867_of_init(struct phy_device *phydev)
{
	struct dp83867_private *dp83867 = phydev->priv;
	struct device *dev = &phydev->mdio.dev;
	struct device_node *of_node = dev->of_node;
	int ret;

	if (!of_node)
		return -ENODEV;

	ret = of_property_read_u32(of_node, "ti,rx-internal-delay",
				   &dp83867->rx_id_delay);
	if (ret)
		return ret;

	ret = of_property_read_u32(of_node, "ti,tx-internal-delay",
				   &dp83867->tx_id_delay);
	if (ret)
		return ret;

	return of_property_read_u32(of_node, "ti,fifo-depth",
				   &dp83867->fifo_depth);
}

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#else



static int dp83867_of_init(struct phy_device *phydev)
{
	return 0;
}

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#endif /* CONFIG_OF_MDIO */




static int dp83867_config_init(struct phy_device *phydev)
{
	struct dp83867_private *dp83867;
	int ret, val;
	u16 delay;

	if (!phydev->priv) {
		dp83867 = devm_kzalloc(&phydev->mdio.dev, sizeof(*dp83867),
				       GFP_KERNEL);
		if (!dp83867)
			return -ENOMEM;

		phydev->priv = dp83867;
		ret = dp83867_of_init(phydev);
		if (ret)
			return ret;
	} else {
		dp83867 = (struct dp83867_private *)phydev->priv;
	}

	if (phy_interface_is_rgmii(phydev)) {
		val = phy_read(phydev, MII_DP83867_PHYCTRL);
		if (val < 0)
			return val;
		val &= ~DP83867_PHYCR_FIFO_DEPTH_MASK;
		val |= (dp83867->fifo_depth << DP83867_PHYCR_FIFO_DEPTH_SHIFT);
		ret = phy_write(phydev, MII_DP83867_PHYCTRL, val);
		if (ret)
			return ret;
	}

	if ((phydev->interface >= PHY_INTERFACE_MODE_RGMII_ID) &&
	    (phydev->interface <= PHY_INTERFACE_MODE_RGMII_RXID)) {
		val = phy_read_mmd_indirect(phydev, DP83867_RGMIICTL,
					    DP83867_DEVADDR);

		if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
			val |= (DP83867_RGMII_TX_CLK_DELAY_EN | DP83867_RGMII_RX_CLK_DELAY_EN);

		if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
			val |= DP83867_RGMII_TX_CLK_DELAY_EN;

		if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
			val |= DP83867_RGMII_RX_CLK_DELAY_EN;

		phy_write_mmd_indirect(phydev, DP83867_RGMIICTL,
				       DP83867_DEVADDR, val);

		delay = (dp83867->rx_id_delay |
			(dp83867->tx_id_delay << DP83867_RGMII_TX_CLK_DELAY_SHIFT));

		phy_write_mmd_indirect(phydev, DP83867_RGMIIDCTL,
				       DP83867_DEVADDR, delay);
	}

	return 0;
}


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static int dp83867_phy_reset(struct phy_device *phydev)
{
	int err;

	err = phy_write(phydev, DP83867_CTRL, DP83867_SW_RESET);
	if (err < 0)
		return err;

	return dp83867_config_init(phydev);
}


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static struct phy_driver dp83867_driver[] = {
	{
		.phy_id		= DP83867_PHY_ID,
		.phy_id_mask	= 0xfffffff0,
		.name		= "TI DP83867",
		.features	= PHY_GBIT_FEATURES,
		.flags		= PHY_HAS_INTERRUPT,

		.config_init	= dp83867_config_init,
		.soft_reset	= dp83867_phy_reset,

		/* IRQ related */
		.ack_interrupt	= dp83867_ack_interrupt,
		.config_intr	= dp83867_config_intr,

		.config_aneg	= genphy_config_aneg,
		.read_status	= genphy_read_status,
		.suspend	= genphy_suspend,
		.resume		= genphy_resume,
        },
};

module_phy_driver(dp83867_driver);


static struct mdio_device_id __maybe_unused dp83867_tbl[] = {
	{ DP83867_PHY_ID, 0xfffffff0 },
	{ }
};

MODULE_DEVICE_TABLE(mdio, dp83867_tbl);

MODULE_DESCRIPTION("Texas Instruments DP83867 PHY driver");
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com");
MODULE_LICENSE("GPL");

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Directory: drivers/net/phy



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