drivers/net/phy/vitesse.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Driver for Vitesse PHYs
  *
  * Author: Kriston Carson
  */

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

 /* Vitesse Extended Page Magic Register(s) */
 #define MII_VSC82X4_EXT_PAGE_16E	0x10
 #define MII_VSC82X4_EXT_PAGE_17E	0x11
 #define MII_VSC82X4_EXT_PAGE_18E	0x12

 /* Vitesse Extended Control Register 1 */
 #define MII_VSC8244_EXT_CON1           0x17
 #define MII_VSC8244_EXTCON1_INIT       0x0000
 #define MII_VSC8244_EXTCON1_TX_SKEW_MASK	0x0c00
 #define MII_VSC8244_EXTCON1_RX_SKEW_MASK	0x0300
 #define MII_VSC8244_EXTCON1_TX_SKEW	0x0800
 #define MII_VSC8244_EXTCON1_RX_SKEW	0x0200

 /* Vitesse Interrupt Mask Register */
 #define MII_VSC8244_IMASK		0x19
 #define MII_VSC8244_IMASK_IEN		0x8000
 #define MII_VSC8244_IMASK_SPEED		0x4000
 #define MII_VSC8244_IMASK_LINK		0x2000
 #define MII_VSC8244_IMASK_DUPLEX	0x1000
 #define MII_VSC8244_IMASK_MASK		0xf000

 #define MII_VSC8221_IMASK_MASK		0xa000

 /* Vitesse Interrupt Status Register */
 #define MII_VSC8244_ISTAT		0x1a
 #define MII_VSC8244_ISTAT_STATUS	0x8000
 #define MII_VSC8244_ISTAT_SPEED		0x4000
 #define MII_VSC8244_ISTAT_LINK		0x2000
 #define MII_VSC8244_ISTAT_DUPLEX	0x1000
 #define MII_VSC8244_ISTAT_MASK		(MII_VSC8244_ISTAT_SPEED | \
 					 MII_VSC8244_ISTAT_LINK | \
 					 MII_VSC8244_ISTAT_DUPLEX)

 #define MII_VSC8221_ISTAT_MASK		MII_VSC8244_ISTAT_LINK

 /* Vitesse Auxiliary Control/Status Register */
 #define MII_VSC8244_AUX_CONSTAT		0x1c
 #define MII_VSC8244_AUXCONSTAT_INIT	0x0000
 #define MII_VSC8244_AUXCONSTAT_DUPLEX	0x0020
 #define MII_VSC8244_AUXCONSTAT_SPEED	0x0018
 #define MII_VSC8244_AUXCONSTAT_GBIT	0x0010
 #define MII_VSC8244_AUXCONSTAT_100	0x0008

 #define MII_VSC8221_AUXCONSTAT_INIT	0x0004 /* need to set this bit? */
 #define MII_VSC8221_AUXCONSTAT_RESERVED	0x0004

 /* Vitesse Extended Page Access Register */
 #define MII_VSC82X4_EXT_PAGE_ACCESS	0x1f

 /* Vitesse VSC8601 Extended PHY Control Register 1 */
 #define MII_VSC8601_EPHY_CTL		0x17
 #define MII_VSC8601_EPHY_CTL_RGMII_SKEW	(1 << 8)

 #define PHY_ID_VSC8234			0x000fc620
 #define PHY_ID_VSC8244			0x000fc6c0
 #define PHY_ID_VSC8572			0x000704d0
 #define PHY_ID_VSC8601			0x00070420
 #define PHY_ID_VSC7385			0x00070450
 #define PHY_ID_VSC7388			0x00070480
 #define PHY_ID_VSC7395			0x00070550
 #define PHY_ID_VSC7398			0x00070580
 #define PHY_ID_VSC8662			0x00070660
 #define PHY_ID_VSC8221			0x000fc550
 #define PHY_ID_VSC8211			0x000fc4b0

 MODULE_DESCRIPTION("Vitesse PHY driver");
 MODULE_AUTHOR("Kriston Carson");
 MODULE_LICENSE("GPL");

 static int vsc824x_add_skew(struct phy_device *phydev)
 {
 	int err;
 	int extcon;

 	extcon = phy_read(phydev, MII_VSC8244_EXT_CON1);

 	if (extcon < 0)
 		return extcon;

 	extcon &= ~(MII_VSC8244_EXTCON1_TX_SKEW_MASK |
 			MII_VSC8244_EXTCON1_RX_SKEW_MASK);

 	extcon |= (MII_VSC8244_EXTCON1_TX_SKEW |
 			MII_VSC8244_EXTCON1_RX_SKEW);

 	err = phy_write(phydev, MII_VSC8244_EXT_CON1, extcon);

 	return err;
 }

 static int vsc824x_config_init(struct phy_device *phydev)
 {
 	int err;

 	err = phy_write(phydev, MII_VSC8244_AUX_CONSTAT,
 			MII_VSC8244_AUXCONSTAT_INIT);
 	if (err < 0)
 		return err;

 	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
 		err = vsc824x_add_skew(phydev);

 	return err;
 }

 #define VSC73XX_EXT_PAGE_ACCESS 0x1f

 static int vsc73xx_read_page(struct phy_device *phydev)
 {
 	return __phy_read(phydev, VSC73XX_EXT_PAGE_ACCESS);
 }

 static int vsc73xx_write_page(struct phy_device *phydev, int page)
 {
 	return __phy_write(phydev, VSC73XX_EXT_PAGE_ACCESS, page);
 }

 static void vsc73xx_config_init(struct phy_device *phydev)
 {
 	/* Receiver init */
 	phy_write(phydev, 0x1f, 0x2a30);
 	phy_modify(phydev, 0x0c, 0x0300, 0x0200);
 	phy_write(phydev, 0x1f, 0x0000);

 	/* Config LEDs 0x61 */
 	phy_modify(phydev, MII_TPISTATUS, 0xff00, 0x0061);
 }

 static int vsc738x_config_init(struct phy_device *phydev)
 {
 	u16 rev;
 	/* This magic sequence appear in the application note
 	 * "VSC7385/7388 PHY Configuration".
 	 *
 	 * Maybe one day we will get to know what it all means.
 	 */
 	phy_write(phydev, 0x1f, 0x2a30);
 	phy_modify(phydev, 0x08, 0x0200, 0x0200);
 	phy_write(phydev, 0x1f, 0x52b5);
 	phy_write(phydev, 0x10, 0xb68a);
 	phy_modify(phydev, 0x12, 0xff07, 0x0003);
 	phy_modify(phydev, 0x11, 0x00ff, 0x00a2);
 	phy_write(phydev, 0x10, 0x968a);
 	phy_write(phydev, 0x1f, 0x2a30);
 	phy_modify(phydev, 0x08, 0x0200, 0x0000);
 	phy_write(phydev, 0x1f, 0x0000);

 	/* Read revision */
 	rev = phy_read(phydev, MII_PHYSID2);
 	rev &= 0x0f;

 	/* Special quirk for revision 0 */
 	if (rev == 0) {
 		phy_write(phydev, 0x1f, 0x2a30);
 		phy_modify(phydev, 0x08, 0x0200, 0x0200);
 		phy_write(phydev, 0x1f, 0x52b5);
 		phy_write(phydev, 0x12, 0x0000);
 		phy_write(phydev, 0x11, 0x0689);
 		phy_write(phydev, 0x10, 0x8f92);
 		phy_write(phydev, 0x1f, 0x52b5);
 		phy_write(phydev, 0x12, 0x0000);
 		phy_write(phydev, 0x11, 0x0e35);
 		phy_write(phydev, 0x10, 0x9786);
 		phy_write(phydev, 0x1f, 0x2a30);
 		phy_modify(phydev, 0x08, 0x0200, 0x0000);
 		phy_write(phydev, 0x17, 0xff80);
 		phy_write(phydev, 0x17, 0x0000);
 	}

 	phy_write(phydev, 0x1f, 0x0000);
 	phy_write(phydev, 0x12, 0x0048);

 	if (rev == 0) {
 		phy_write(phydev, 0x1f, 0x2a30);
 		phy_write(phydev, 0x14, 0x6600);
 		phy_write(phydev, 0x1f, 0x0000);
 		phy_write(phydev, 0x18, 0xa24e);
 	} else {
 		phy_write(phydev, 0x1f, 0x2a30);
 		phy_modify(phydev, 0x16, 0x0fc0, 0x0240);
 		phy_modify(phydev, 0x14, 0x6000, 0x4000);
 		/* bits 14-15 in extended register 0x14 controls DACG amplitude
 		 * 6 = -8%, 2 is hardware default
 		 */
 		phy_write(phydev, 0x1f, 0x0001);
 		phy_modify(phydev, 0x14, 0xe000, 0x6000);
 		phy_write(phydev, 0x1f, 0x0000);
 	}

 	vsc73xx_config_init(phydev);

 	return 0;
 }

 static int vsc739x_config_init(struct phy_device *phydev)
 {
 	/* This magic sequence appears in the VSC7395 SparX-G5e application
 	 * note "VSC7395/VSC7398 PHY Configuration"
 	 *
 	 * Maybe one day we will get to know what it all means.
 	 */
 	phy_write(phydev, 0x1f, 0x2a30);
 	phy_modify(phydev, 0x08, 0x0200, 0x0200);
 	phy_write(phydev, 0x1f, 0x52b5);
 	phy_write(phydev, 0x10, 0xb68a);
 	phy_modify(phydev, 0x12, 0xff07, 0x0003);
 	phy_modify(phydev, 0x11, 0x00ff, 0x00a2);
 	phy_write(phydev, 0x10, 0x968a);
 	phy_write(phydev, 0x1f, 0x2a30);
 	phy_modify(phydev, 0x08, 0x0200, 0x0000);
 	phy_write(phydev, 0x1f, 0x0000);

 	phy_write(phydev, 0x1f, 0x0000);
 	phy_write(phydev, 0x12, 0x0048);
 	phy_write(phydev, 0x1f, 0x2a30);
 	phy_modify(phydev, 0x16, 0x0fc0, 0x0240);
 	phy_modify(phydev, 0x14, 0x6000, 0x4000);
 	phy_write(phydev, 0x1f, 0x0001);
 	phy_modify(phydev, 0x14, 0xe000, 0x6000);
 	phy_write(phydev, 0x1f, 0x0000);

 	vsc73xx_config_init(phydev);

 	return 0;
 }

 static int vsc73xx_config_aneg(struct phy_device *phydev)
 {
 	/* The VSC73xx switches does not like to be instructed to
 	 * do autonegotiation in any way, it prefers that you just go
 	 * with the power-on/reset defaults. Writing some registers will
 	 * just make autonegotiation permanently fail.
 	 */
 	return 0;
 }

 /* This adds a skew for both TX and RX clocks, so the skew should only be
  * applied to "rgmii-id" interfaces. It may not work as expected
  * on "rgmii-txid", "rgmii-rxid" or "rgmii" interfaces.
  */
 static int vsc8601_add_skew(struct phy_device *phydev)
 {
 	int ret;

 	ret = phy_read(phydev, MII_VSC8601_EPHY_CTL);
 	if (ret < 0)
 		return ret;

 	ret |= MII_VSC8601_EPHY_CTL_RGMII_SKEW;
 	return phy_write(phydev, MII_VSC8601_EPHY_CTL, ret);
 }

 static int vsc8601_config_init(struct phy_device *phydev)
 {
 	int ret = 0;

 	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
 		ret = vsc8601_add_skew(phydev);

 	if (ret < 0)
 		return ret;

 	return 0;
 }

 static int vsc82xx_config_intr(struct phy_device *phydev)
 {
 	int err;

 	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
 		/* Don't bother to ACK the interrupts since the 824x cannot
 		 * clear the interrupts if they are disabled.
 		 */
 		err = phy_write(phydev, MII_VSC8244_IMASK,
 			(phydev->drv->phy_id == PHY_ID_VSC8234 ||
 			 phydev->drv->phy_id == PHY_ID_VSC8244 ||
 			 phydev->drv->phy_id == PHY_ID_VSC8572 ||
 			 phydev->drv->phy_id == PHY_ID_VSC8601) ?
 				MII_VSC8244_IMASK_MASK :
 				MII_VSC8221_IMASK_MASK);
 	else {
 		/* The Vitesse PHY cannot clear the interrupt
 		 * once it has disabled them, so we clear them first
 		 */
 		err = phy_read(phydev, MII_VSC8244_ISTAT);

 		if (err < 0)
 			return err;

 		err = phy_write(phydev, MII_VSC8244_IMASK, 0);
 	}

 	return err;
 }

 static irqreturn_t vsc82xx_handle_interrupt(struct phy_device *phydev)
 {
 	int irq_status, irq_mask;

 	if (phydev->drv->phy_id == PHY_ID_VSC8244 ||
 	    phydev->drv->phy_id == PHY_ID_VSC8572 ||
 	    phydev->drv->phy_id == PHY_ID_VSC8601)
 		irq_mask = MII_VSC8244_ISTAT_MASK;
 	else
 		irq_mask = MII_VSC8221_ISTAT_MASK;

 	irq_status = phy_read(phydev, MII_VSC8244_ISTAT);
 	if (irq_status < 0) {
 		phy_error(phydev);
 		return IRQ_NONE;
 	}

 	if (!(irq_status & irq_mask))
 		return IRQ_NONE;

 	phy_trigger_machine(phydev);

 	return IRQ_HANDLED;
 }

 static int vsc8221_config_init(struct phy_device *phydev)
 {
 	int err;

 	err = phy_write(phydev, MII_VSC8244_AUX_CONSTAT,
 			MII_VSC8221_AUXCONSTAT_INIT);
 	return err;

 	/* Perhaps we should set EXT_CON1 based on the interface?
 	 * Options are 802.3Z SerDes or SGMII
 	 */
 }

 /* vsc82x4_config_autocross_enable - Enable auto MDI/MDI-X for forced links
  * @phydev: target phy_device struct
  *
  * Enable auto MDI/MDI-X when in 10/100 forced link speeds by writing
  * special values in the VSC8234/VSC8244 extended reserved registers
  */
 static int vsc82x4_config_autocross_enable(struct phy_device *phydev)
 {
 	int ret;

 	if (phydev->autoneg == AUTONEG_ENABLE || phydev->speed > SPEED_100)
 		return 0;

 	/* map extended registers set 0x10 - 0x1e */
 	ret = phy_write(phydev, MII_VSC82X4_EXT_PAGE_ACCESS, 0x52b5);
 	if (ret >= 0)
 		ret = phy_write(phydev, MII_VSC82X4_EXT_PAGE_18E, 0x0012);
 	if (ret >= 0)
 		ret = phy_write(phydev, MII_VSC82X4_EXT_PAGE_17E, 0x2803);
 	if (ret >= 0)
 		ret = phy_write(phydev, MII_VSC82X4_EXT_PAGE_16E, 0x87fa);
 	/* map standard registers set 0x10 - 0x1e */
 	if (ret >= 0)
 		ret = phy_write(phydev, MII_VSC82X4_EXT_PAGE_ACCESS, 0x0000);
 	else
 		phy_write(phydev, MII_VSC82X4_EXT_PAGE_ACCESS, 0x0000);

 	return ret;
 }

 /* vsc82x4_config_aneg - restart auto-negotiation or write BMCR
  * @phydev: target phy_device struct
  *
  * Description: If auto-negotiation is enabled, we configure the
  *   advertising, and then restart auto-negotiation.  If it is not
  *   enabled, then we write the BMCR and also start the auto
  *   MDI/MDI-X feature
  */
 static int vsc82x4_config_aneg(struct phy_device *phydev)
 {
 	int ret;

 	/* Enable auto MDI/MDI-X when in 10/100 forced link speeds by
 	 * writing special values in the VSC8234 extended reserved registers
 	 */
 	if (phydev->autoneg != AUTONEG_ENABLE && phydev->speed <= SPEED_100) {
 		ret = genphy_setup_forced(phydev);

 		if (ret < 0) /* error */
 			return ret;

 		return vsc82x4_config_autocross_enable(phydev);
 	}

 	return genphy_config_aneg(phydev);
 }

 /* Vitesse 82xx */
 static struct phy_driver vsc82xx_driver[] = {
 {
 	.phy_id         = PHY_ID_VSC8234,
 	.name           = "Vitesse VSC8234",
 	.phy_id_mask    = 0x000ffff0,
 	/* PHY_GBIT_FEATURES */
 	.config_init    = &vsc824x_config_init,
 	.config_aneg    = &vsc82x4_config_aneg,
 	.config_intr    = &vsc82xx_config_intr,
 	.handle_interrupt = &vsc82xx_handle_interrupt,
 }, {
 	.phy_id		= PHY_ID_VSC8244,
 	.name		= "Vitesse VSC8244",
 	.phy_id_mask	= 0x000fffc0,
 	/* PHY_GBIT_FEATURES */
 	.config_init	= &vsc824x_config_init,
 	.config_aneg	= &vsc82x4_config_aneg,
 	.config_intr	= &vsc82xx_config_intr,
 	.handle_interrupt = &vsc82xx_handle_interrupt,
 }, {
 	.phy_id         = PHY_ID_VSC8572,
 	.name           = "Vitesse VSC8572",
 	.phy_id_mask    = 0x000ffff0,
 	/* PHY_GBIT_FEATURES */
 	.config_init    = &vsc824x_config_init,
 	.config_aneg    = &vsc82x4_config_aneg,
 	.config_intr    = &vsc82xx_config_intr,
 	.handle_interrupt = &vsc82xx_handle_interrupt,
 }, {
 	.phy_id         = PHY_ID_VSC8601,
 	.name           = "Vitesse VSC8601",
 	.phy_id_mask    = 0x000ffff0,
 	/* PHY_GBIT_FEATURES */
 	.config_init    = &vsc8601_config_init,
 	.config_intr    = &vsc82xx_config_intr,
 	.handle_interrupt = &vsc82xx_handle_interrupt,
 }, {
 	.phy_id         = PHY_ID_VSC7385,
 	.name           = "Vitesse VSC7385",
 	.phy_id_mask    = 0x000ffff0,
 	/* PHY_GBIT_FEATURES */
 	.config_init    = vsc738x_config_init,
 	.config_aneg    = vsc73xx_config_aneg,
 	.read_page      = vsc73xx_read_page,
 	.write_page     = vsc73xx_write_page,
 }, {
 	.phy_id         = PHY_ID_VSC7388,
 	.name           = "Vitesse VSC7388",
 	.phy_id_mask    = 0x000ffff0,
 	/* PHY_GBIT_FEATURES */
 	.config_init    = vsc738x_config_init,
 	.config_aneg    = vsc73xx_config_aneg,
 	.read_page      = vsc73xx_read_page,
 	.write_page     = vsc73xx_write_page,
 }, {
 	.phy_id         = PHY_ID_VSC7395,
 	.name           = "Vitesse VSC7395",
 	.phy_id_mask    = 0x000ffff0,
 	/* PHY_GBIT_FEATURES */
 	.config_init    = vsc739x_config_init,
 	.config_aneg    = vsc73xx_config_aneg,
 	.read_page      = vsc73xx_read_page,
 	.write_page     = vsc73xx_write_page,
 }, {
 	.phy_id         = PHY_ID_VSC7398,
 	.name           = "Vitesse VSC7398",
 	.phy_id_mask    = 0x000ffff0,
 	/* PHY_GBIT_FEATURES */
 	.config_init    = vsc739x_config_init,
 	.config_aneg    = vsc73xx_config_aneg,
 	.read_page      = vsc73xx_read_page,
 	.write_page     = vsc73xx_write_page,
 }, {
 	.phy_id         = PHY_ID_VSC8662,
 	.name           = "Vitesse VSC8662",
 	.phy_id_mask    = 0x000ffff0,
 	/* PHY_GBIT_FEATURES */
 	.config_init    = &vsc824x_config_init,
 	.config_aneg    = &vsc82x4_config_aneg,
 	.config_intr    = &vsc82xx_config_intr,
 	.handle_interrupt = &vsc82xx_handle_interrupt,
 }, {
 	/* Vitesse 8221 */
 	.phy_id		= PHY_ID_VSC8221,
 	.phy_id_mask	= 0x000ffff0,
 	.name		= "Vitesse VSC8221",
 	/* PHY_GBIT_FEATURES */
 	.config_init	= &vsc8221_config_init,
 	.config_intr	= &vsc82xx_config_intr,
 	.handle_interrupt = &vsc82xx_handle_interrupt,
 }, {
 	/* Vitesse 8211 */
 	.phy_id		= PHY_ID_VSC8211,
 	.phy_id_mask	= 0x000ffff0,
 	.name		= "Vitesse VSC8211",
 	/* PHY_GBIT_FEATURES */
 	.config_init	= &vsc8221_config_init,
 	.config_intr	= &vsc82xx_config_intr,
 	.handle_interrupt = &vsc82xx_handle_interrupt,
 } };

 module_phy_driver(vsc82xx_driver);

 static struct mdio_device_id __maybe_unused vitesse_tbl[] = {
 	{ PHY_ID_VSC8234, 0x000ffff0 },
 	{ PHY_ID_VSC8244, 0x000fffc0 },
 	{ PHY_ID_VSC8572, 0x000ffff0 },
 	{ PHY_ID_VSC7385, 0x000ffff0 },
 	{ PHY_ID_VSC7388, 0x000ffff0 },
 	{ PHY_ID_VSC7395, 0x000ffff0 },
 	{ PHY_ID_VSC7398, 0x000ffff0 },
 	{ PHY_ID_VSC8662, 0x000ffff0 },
 	{ PHY_ID_VSC8221, 0x000ffff0 },
 	{ PHY_ID_VSC8211, 0x000ffff0 },
 	{ }
 };

 MODULE_DEVICE_TABLE(mdio, vitesse_tbl);
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Driver for Vitesse PHYs
	*
	* Author: Kriston Carson
	*/

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

	/* Vitesse Extended Page Magic Register(s) */
	#define MII_VSC82X4_EXT_PAGE_16E 0x10
	#define MII_VSC82X4_EXT_PAGE_17E 0x11
	#define MII_VSC82X4_EXT_PAGE_18E 0x12

	/* Vitesse Extended Control Register 1 */
	#define MII_VSC8244_EXT_CON1 0x17
	#define MII_VSC8244_EXTCON1_INIT 0x0000
	#define MII_VSC8244_EXTCON1_TX_SKEW_MASK 0x0c00
	#define MII_VSC8244_EXTCON1_RX_SKEW_MASK 0x0300
	#define MII_VSC8244_EXTCON1_TX_SKEW 0x0800
	#define MII_VSC8244_EXTCON1_RX_SKEW 0x0200

	/* Vitesse Interrupt Mask Register */
	#define MII_VSC8244_IMASK 0x19
	#define MII_VSC8244_IMASK_IEN 0x8000
	#define MII_VSC8244_IMASK_SPEED 0x4000
	#define MII_VSC8244_IMASK_LINK 0x2000
	#define MII_VSC8244_IMASK_DUPLEX 0x1000
	#define MII_VSC8244_IMASK_MASK 0xf000

	#define MII_VSC8221_IMASK_MASK 0xa000

	/* Vitesse Interrupt Status Register */
	#define MII_VSC8244_ISTAT 0x1a
	#define MII_VSC8244_ISTAT_STATUS 0x8000
	#define MII_VSC8244_ISTAT_SPEED 0x4000
	#define MII_VSC8244_ISTAT_LINK 0x2000
	#define MII_VSC8244_ISTAT_DUPLEX 0x1000
	#define MII_VSC8244_ISTAT_MASK (MII_VSC8244_ISTAT_SPEED \| \
	MII_VSC8244_ISTAT_LINK \| \
	MII_VSC8244_ISTAT_DUPLEX)

	#define MII_VSC8221_ISTAT_MASK MII_VSC8244_ISTAT_LINK

	/* Vitesse Auxiliary Control/Status Register */
	#define MII_VSC8244_AUX_CONSTAT 0x1c
	#define MII_VSC8244_AUXCONSTAT_INIT 0x0000
	#define MII_VSC8244_AUXCONSTAT_DUPLEX 0x0020
	#define MII_VSC8244_AUXCONSTAT_SPEED 0x0018
	#define MII_VSC8244_AUXCONSTAT_GBIT 0x0010
	#define MII_VSC8244_AUXCONSTAT_100 0x0008

	#define MII_VSC8221_AUXCONSTAT_INIT 0x0004 /* need to set this bit? */
	#define MII_VSC8221_AUXCONSTAT_RESERVED 0x0004

	/* Vitesse Extended Page Access Register */
	#define MII_VSC82X4_EXT_PAGE_ACCESS 0x1f

	/* Vitesse VSC8601 Extended PHY Control Register 1 */
	#define MII_VSC8601_EPHY_CTL 0x17
	#define MII_VSC8601_EPHY_CTL_RGMII_SKEW (1 << 8)

	#define PHY_ID_VSC8234 0x000fc620
	#define PHY_ID_VSC8244 0x000fc6c0
	#define PHY_ID_VSC8572 0x000704d0
	#define PHY_ID_VSC8601 0x00070420
	#define PHY_ID_VSC7385 0x00070450
	#define PHY_ID_VSC7388 0x00070480
	#define PHY_ID_VSC7395 0x00070550
	#define PHY_ID_VSC7398 0x00070580
	#define PHY_ID_VSC8662 0x00070660
	#define PHY_ID_VSC8221 0x000fc550
	#define PHY_ID_VSC8211 0x000fc4b0

	MODULE_DESCRIPTION("Vitesse PHY driver");
	MODULE_AUTHOR("Kriston Carson");
	MODULE_LICENSE("GPL");

	static int vsc824x_add_skew(struct phy_device *phydev)
	{
	int err;
	int extcon;

	extcon = phy_read(phydev, MII_VSC8244_EXT_CON1);

	if (extcon < 0)
	return extcon;

	extcon &= ~(MII_VSC8244_EXTCON1_TX_SKEW_MASK \|
	MII_VSC8244_EXTCON1_RX_SKEW_MASK);

	extcon \|= (MII_VSC8244_EXTCON1_TX_SKEW \|
	MII_VSC8244_EXTCON1_RX_SKEW);

	err = phy_write(phydev, MII_VSC8244_EXT_CON1, extcon);

	return err;
	}

	static int vsc824x_config_init(struct phy_device *phydev)
	{
	int err;

	err = phy_write(phydev, MII_VSC8244_AUX_CONSTAT,
	MII_VSC8244_AUXCONSTAT_INIT);
	if (err < 0)
	return err;

	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
	err = vsc824x_add_skew(phydev);

	return err;
	}

	#define VSC73XX_EXT_PAGE_ACCESS 0x1f

	static int vsc73xx_read_page(struct phy_device *phydev)
	{
	return __phy_read(phydev, VSC73XX_EXT_PAGE_ACCESS);
	}

	static int vsc73xx_write_page(struct phy_device *phydev, int page)
	{
	return __phy_write(phydev, VSC73XX_EXT_PAGE_ACCESS, page);
	}

	static void vsc73xx_config_init(struct phy_device *phydev)
	{
	/* Receiver init */
	phy_write(phydev, 0x1f, 0x2a30);
	phy_modify(phydev, 0x0c, 0x0300, 0x0200);
	phy_write(phydev, 0x1f, 0x0000);

	/* Config LEDs 0x61 */
	phy_modify(phydev, MII_TPISTATUS, 0xff00, 0x0061);
	}

	static int vsc738x_config_init(struct phy_device *phydev)
	{
	u16 rev;
	/* This magic sequence appear in the application note
	* "VSC7385/7388 PHY Configuration".
	*
	* Maybe one day we will get to know what it all means.
	*/
	phy_write(phydev, 0x1f, 0x2a30);
	phy_modify(phydev, 0x08, 0x0200, 0x0200);
	phy_write(phydev, 0x1f, 0x52b5);
	phy_write(phydev, 0x10, 0xb68a);
	phy_modify(phydev, 0x12, 0xff07, 0x0003);
	phy_modify(phydev, 0x11, 0x00ff, 0x00a2);
	phy_write(phydev, 0x10, 0x968a);
	phy_write(phydev, 0x1f, 0x2a30);
	phy_modify(phydev, 0x08, 0x0200, 0x0000);
	phy_write(phydev, 0x1f, 0x0000);

	/* Read revision */
	rev = phy_read(phydev, MII_PHYSID2);
	rev &= 0x0f;

	/* Special quirk for revision 0 */
	if (rev == 0) {
	phy_write(phydev, 0x1f, 0x2a30);
	phy_modify(phydev, 0x08, 0x0200, 0x0200);
	phy_write(phydev, 0x1f, 0x52b5);
	phy_write(phydev, 0x12, 0x0000);
	phy_write(phydev, 0x11, 0x0689);
	phy_write(phydev, 0x10, 0x8f92);
	phy_write(phydev, 0x1f, 0x52b5);
	phy_write(phydev, 0x12, 0x0000);
	phy_write(phydev, 0x11, 0x0e35);
	phy_write(phydev, 0x10, 0x9786);
	phy_write(phydev, 0x1f, 0x2a30);
	phy_modify(phydev, 0x08, 0x0200, 0x0000);
	phy_write(phydev, 0x17, 0xff80);
	phy_write(phydev, 0x17, 0x0000);
	}

	phy_write(phydev, 0x1f, 0x0000);
	phy_write(phydev, 0x12, 0x0048);

	if (rev == 0) {
	phy_write(phydev, 0x1f, 0x2a30);
	phy_write(phydev, 0x14, 0x6600);
	phy_write(phydev, 0x1f, 0x0000);
	phy_write(phydev, 0x18, 0xa24e);
	} else {
	phy_write(phydev, 0x1f, 0x2a30);
	phy_modify(phydev, 0x16, 0x0fc0, 0x0240);
	phy_modify(phydev, 0x14, 0x6000, 0x4000);
	/* bits 14-15 in extended register 0x14 controls DACG amplitude
	* 6 = -8%, 2 is hardware default
	*/
	phy_write(phydev, 0x1f, 0x0001);
	phy_modify(phydev, 0x14, 0xe000, 0x6000);
	phy_write(phydev, 0x1f, 0x0000);
	}

	vsc73xx_config_init(phydev);

	return 0;
	}

	static int vsc739x_config_init(struct phy_device *phydev)
	{
	/* This magic sequence appears in the VSC7395 SparX-G5e application
	* note "VSC7395/VSC7398 PHY Configuration"
	*
	* Maybe one day we will get to know what it all means.
	*/
	phy_write(phydev, 0x1f, 0x2a30);
	phy_modify(phydev, 0x08, 0x0200, 0x0200);
	phy_write(phydev, 0x1f, 0x52b5);
	phy_write(phydev, 0x10, 0xb68a);
	phy_modify(phydev, 0x12, 0xff07, 0x0003);
	phy_modify(phydev, 0x11, 0x00ff, 0x00a2);
	phy_write(phydev, 0x10, 0x968a);
	phy_write(phydev, 0x1f, 0x2a30);
	phy_modify(phydev, 0x08, 0x0200, 0x0000);
	phy_write(phydev, 0x1f, 0x0000);

	phy_write(phydev, 0x1f, 0x0000);
	phy_write(phydev, 0x12, 0x0048);
	phy_write(phydev, 0x1f, 0x2a30);
	phy_modify(phydev, 0x16, 0x0fc0, 0x0240);
	phy_modify(phydev, 0x14, 0x6000, 0x4000);
	phy_write(phydev, 0x1f, 0x0001);
	phy_modify(phydev, 0x14, 0xe000, 0x6000);
	phy_write(phydev, 0x1f, 0x0000);

	vsc73xx_config_init(phydev);

	return 0;
	}

	static int vsc73xx_config_aneg(struct phy_device *phydev)
	{
	/* The VSC73xx switches does not like to be instructed to
	* do autonegotiation in any way, it prefers that you just go
	* with the power-on/reset defaults. Writing some registers will
	* just make autonegotiation permanently fail.
	*/
	return 0;
	}

	/* This adds a skew for both TX and RX clocks, so the skew should only be
	* applied to "rgmii-id" interfaces. It may not work as expected
	* on "rgmii-txid", "rgmii-rxid" or "rgmii" interfaces.
	*/
	static int vsc8601_add_skew(struct phy_device *phydev)
	{
	int ret;

	ret = phy_read(phydev, MII_VSC8601_EPHY_CTL);
	if (ret < 0)
	return ret;

	ret \|= MII_VSC8601_EPHY_CTL_RGMII_SKEW;
	return phy_write(phydev, MII_VSC8601_EPHY_CTL, ret);
	}

	static int vsc8601_config_init(struct phy_device *phydev)
	{
	int ret = 0;

	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
	ret = vsc8601_add_skew(phydev);

	if (ret < 0)
	return ret;

	return 0;
	}

	static int vsc82xx_config_intr(struct phy_device *phydev)
	{
	int err;

	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
	/* Don't bother to ACK the interrupts since the 824x cannot
	* clear the interrupts if they are disabled.
	*/
	err = phy_write(phydev, MII_VSC8244_IMASK,
	(phydev->drv->phy_id == PHY_ID_VSC8234 \|\|
	phydev->drv->phy_id == PHY_ID_VSC8244 \|\|
	phydev->drv->phy_id == PHY_ID_VSC8572 \|\|
	phydev->drv->phy_id == PHY_ID_VSC8601) ?
	MII_VSC8244_IMASK_MASK :
	MII_VSC8221_IMASK_MASK);
	else {
	/* The Vitesse PHY cannot clear the interrupt
	* once it has disabled them, so we clear them first
	*/
	err = phy_read(phydev, MII_VSC8244_ISTAT);

	if (err < 0)
	return err;

	err = phy_write(phydev, MII_VSC8244_IMASK, 0);
	}

	return err;
	}

	static irqreturn_t vsc82xx_handle_interrupt(struct phy_device *phydev)
	{
	int irq_status, irq_mask;

	if (phydev->drv->phy_id == PHY_ID_VSC8244 \|\|
	phydev->drv->phy_id == PHY_ID_VSC8572 \|\|
	phydev->drv->phy_id == PHY_ID_VSC8601)
	irq_mask = MII_VSC8244_ISTAT_MASK;
	else
	irq_mask = MII_VSC8221_ISTAT_MASK;

	irq_status = phy_read(phydev, MII_VSC8244_ISTAT);
	if (irq_status < 0) {
	phy_error(phydev);
	return IRQ_NONE;
	}

	if (!(irq_status & irq_mask))
	return IRQ_NONE;

	phy_trigger_machine(phydev);

	return IRQ_HANDLED;
	}

	static int vsc8221_config_init(struct phy_device *phydev)
	{
	int err;

	err = phy_write(phydev, MII_VSC8244_AUX_CONSTAT,
	MII_VSC8221_AUXCONSTAT_INIT);
	return err;

	/* Perhaps we should set EXT_CON1 based on the interface?
	* Options are 802.3Z SerDes or SGMII
	*/
	}

	/* vsc82x4_config_autocross_enable - Enable auto MDI/MDI-X for forced links
	* @phydev: target phy_device struct
	*
	* Enable auto MDI/MDI-X when in 10/100 forced link speeds by writing
	* special values in the VSC8234/VSC8244 extended reserved registers
	*/
	static int vsc82x4_config_autocross_enable(struct phy_device *phydev)
	{
	int ret;

	if (phydev->autoneg == AUTONEG_ENABLE \|\| phydev->speed > SPEED_100)
	return 0;

	/* map extended registers set 0x10 - 0x1e */
	ret = phy_write(phydev, MII_VSC82X4_EXT_PAGE_ACCESS, 0x52b5);
	if (ret >= 0)
	ret = phy_write(phydev, MII_VSC82X4_EXT_PAGE_18E, 0x0012);
	if (ret >= 0)
	ret = phy_write(phydev, MII_VSC82X4_EXT_PAGE_17E, 0x2803);
	if (ret >= 0)
	ret = phy_write(phydev, MII_VSC82X4_EXT_PAGE_16E, 0x87fa);
	/* map standard registers set 0x10 - 0x1e */
	if (ret >= 0)
	ret = phy_write(phydev, MII_VSC82X4_EXT_PAGE_ACCESS, 0x0000);
	else
	phy_write(phydev, MII_VSC82X4_EXT_PAGE_ACCESS, 0x0000);

	return ret;
	}

	/* vsc82x4_config_aneg - restart auto-negotiation or write BMCR
	* @phydev: target phy_device struct
	*
	* Description: If auto-negotiation is enabled, we configure the
	* advertising, and then restart auto-negotiation. If it is not
	* enabled, then we write the BMCR and also start the auto
	* MDI/MDI-X feature
	*/
	static int vsc82x4_config_aneg(struct phy_device *phydev)
	{
	int ret;

	/* Enable auto MDI/MDI-X when in 10/100 forced link speeds by
	* writing special values in the VSC8234 extended reserved registers
	*/
	if (phydev->autoneg != AUTONEG_ENABLE && phydev->speed <= SPEED_100) {
	ret = genphy_setup_forced(phydev);

	if (ret < 0) /* error */
	return ret;

	return vsc82x4_config_autocross_enable(phydev);
	}

	return genphy_config_aneg(phydev);
	}

	/* Vitesse 82xx */
	static struct phy_driver vsc82xx_driver[] = {
	{
	.phy_id = PHY_ID_VSC8234,
	.name = "Vitesse VSC8234",
	.phy_id_mask = 0x000ffff0,
	/* PHY_GBIT_FEATURES */
	.config_init = &vsc824x_config_init,
	.config_aneg = &vsc82x4_config_aneg,
	.config_intr = &vsc82xx_config_intr,
	.handle_interrupt = &vsc82xx_handle_interrupt,
	}, {
	.phy_id = PHY_ID_VSC8244,
	.name = "Vitesse VSC8244",
	.phy_id_mask = 0x000fffc0,
	/* PHY_GBIT_FEATURES */
	.config_init = &vsc824x_config_init,
	.config_aneg = &vsc82x4_config_aneg,
	.config_intr = &vsc82xx_config_intr,
	.handle_interrupt = &vsc82xx_handle_interrupt,
	}, {
	.phy_id = PHY_ID_VSC8572,
	.name = "Vitesse VSC8572",
	.phy_id_mask = 0x000ffff0,
	/* PHY_GBIT_FEATURES */
	.config_init = &vsc824x_config_init,
	.config_aneg = &vsc82x4_config_aneg,
	.config_intr = &vsc82xx_config_intr,
	.handle_interrupt = &vsc82xx_handle_interrupt,
	}, {
	.phy_id = PHY_ID_VSC8601,
	.name = "Vitesse VSC8601",
	.phy_id_mask = 0x000ffff0,
	/* PHY_GBIT_FEATURES */
	.config_init = &vsc8601_config_init,
	.config_intr = &vsc82xx_config_intr,
	.handle_interrupt = &vsc82xx_handle_interrupt,
	}, {
	.phy_id = PHY_ID_VSC7385,
	.name = "Vitesse VSC7385",
	.phy_id_mask = 0x000ffff0,
	/* PHY_GBIT_FEATURES */
	.config_init = vsc738x_config_init,
	.config_aneg = vsc73xx_config_aneg,
	.read_page = vsc73xx_read_page,
	.write_page = vsc73xx_write_page,
	}, {
	.phy_id = PHY_ID_VSC7388,
	.name = "Vitesse VSC7388",
	.phy_id_mask = 0x000ffff0,
	/* PHY_GBIT_FEATURES */
	.config_init = vsc738x_config_init,
	.config_aneg = vsc73xx_config_aneg,
	.read_page = vsc73xx_read_page,
	.write_page = vsc73xx_write_page,
	}, {
	.phy_id = PHY_ID_VSC7395,
	.name = "Vitesse VSC7395",
	.phy_id_mask = 0x000ffff0,
	/* PHY_GBIT_FEATURES */
	.config_init = vsc739x_config_init,
	.config_aneg = vsc73xx_config_aneg,
	.read_page = vsc73xx_read_page,
	.write_page = vsc73xx_write_page,
	}, {
	.phy_id = PHY_ID_VSC7398,
	.name = "Vitesse VSC7398",
	.phy_id_mask = 0x000ffff0,
	/* PHY_GBIT_FEATURES */
	.config_init = vsc739x_config_init,
	.config_aneg = vsc73xx_config_aneg,
	.read_page = vsc73xx_read_page,
	.write_page = vsc73xx_write_page,
	}, {
	.phy_id = PHY_ID_VSC8662,
	.name = "Vitesse VSC8662",
	.phy_id_mask = 0x000ffff0,
	/* PHY_GBIT_FEATURES */
	.config_init = &vsc824x_config_init,
	.config_aneg = &vsc82x4_config_aneg,
	.config_intr = &vsc82xx_config_intr,
	.handle_interrupt = &vsc82xx_handle_interrupt,
	}, {
	/* Vitesse 8221 */
	.phy_id = PHY_ID_VSC8221,
	.phy_id_mask = 0x000ffff0,
	.name = "Vitesse VSC8221",
	/* PHY_GBIT_FEATURES */
	.config_init = &vsc8221_config_init,
	.config_intr = &vsc82xx_config_intr,
	.handle_interrupt = &vsc82xx_handle_interrupt,
	}, {
	/* Vitesse 8211 */
	.phy_id = PHY_ID_VSC8211,
	.phy_id_mask = 0x000ffff0,
	.name = "Vitesse VSC8211",
	/* PHY_GBIT_FEATURES */
	.config_init = &vsc8221_config_init,
	.config_intr = &vsc82xx_config_intr,
	.handle_interrupt = &vsc82xx_handle_interrupt,
	} };

	module_phy_driver(vsc82xx_driver);

	static struct mdio_device_id __maybe_unused vitesse_tbl[] = {
	{ PHY_ID_VSC8234, 0x000ffff0 },
	{ PHY_ID_VSC8244, 0x000fffc0 },
	{ PHY_ID_VSC8572, 0x000ffff0 },
	{ PHY_ID_VSC7385, 0x000ffff0 },
	{ PHY_ID_VSC7388, 0x000ffff0 },
	{ PHY_ID_VSC7395, 0x000ffff0 },
	{ PHY_ID_VSC7398, 0x000ffff0 },
	{ PHY_ID_VSC8662, 0x000ffff0 },
	{ PHY_ID_VSC8221, 0x000ffff0 },
	{ PHY_ID_VSC8211, 0x000ffff0 },
	{ }
	};

	MODULE_DEVICE_TABLE(mdio, vitesse_tbl);