text: // SPDX-License-Identifier: GPL-2.0+
  /*
   * Generic PHY Management code
   *
   * Copyright 2011 Freescale Semiconductor, Inc.
   * author Andy Fleming
   *
   * Based loosely off of Linux's PHY Lib
   */
  #include <common.h>
  #include <console.h>
  #include <dm.h>
  #include <malloc.h>
  #include <net.h>
  #include <command.h>
  #include <miiphy.h>
  #include <phy.h>
  #include <errno.h>
  #include <linux/err.h>
  #include <linux/compiler.h>
  
  DECLARE_GLOBAL_DATA_PTR;
  
  /* Generic PHY support and helper functions */
  
  /**
   * genphy_config_advert - sanitize and advertise auto-negotiation parameters
   * @phydev: target phy_device struct
   *
   * Description: Writes MII_ADVERTISE with the appropriate values,
   *   after sanitizing the values to make sure we only advertise
   *   what is supported.  Returns < 0 on error, 0 if the PHY's advertisement
   *   hasn't changed, and > 0 if it has changed.
   */
  static int genphy_config_advert(struct phy_device *phydev)
  {
  	u32 advertise;
  	int oldadv, adv, bmsr;
  	int err, changed = 0;
  
  	/* Only allow advertising what this PHY supports */
  	phydev->advertising &= phydev->supported;
  	advertise = phydev->advertising;
  
  	/* Setup standard advertisement */
  	adv = phy_read(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE);
  	oldadv = adv;
  
  	if (adv < 0)
  		return adv;
  
  	adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
  		 ADVERTISE_PAUSE_ASYM);
  	if (advertise & ADVERTISED_10baseT_Half)
  		adv |= ADVERTISE_10HALF;
  	if (advertise & ADVERTISED_10baseT_Full)
  		adv |= ADVERTISE_10FULL;
  	if (advertise & ADVERTISED_100baseT_Half)
  		adv |= ADVERTISE_100HALF;
  	if (advertise & ADVERTISED_100baseT_Full)
  		adv |= ADVERTISE_100FULL;
  	if (advertise & ADVERTISED_Pause)
  		adv |= ADVERTISE_PAUSE_CAP;
  	if (advertise & ADVERTISED_Asym_Pause)
  		adv |= ADVERTISE_PAUSE_ASYM;
  	if (advertise & ADVERTISED_1000baseX_Half)
  		adv |= ADVERTISE_1000XHALF;
  	if (advertise & ADVERTISED_1000baseX_Full)
  		adv |= ADVERTISE_1000XFULL;
  
  	if (adv != oldadv) {
  		err = phy_write(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE, adv);
  
  		if (err < 0)
  			return err;
  		changed = 1;
  	}
  
  	bmsr = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
  	if (bmsr < 0)
  		return bmsr;
  
  	/* Per 802.3-2008, Section 22.2.4.2.16 Extended status all
  	 * 1000Mbits/sec capable PHYs shall have the BMSR_ESTATEN bit set to a
  	 * logical 1.
  	 */
  	if (!(bmsr & BMSR_ESTATEN))
  		return changed;
  
  	/* Configure gigabit if it's supported */
  	adv = phy_read(phydev, MDIO_DEVAD_NONE, MII_CTRL1000);
  	oldadv = adv;
  
  	if (adv < 0)
  		return adv;
  
  	adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
  
  	if (phydev->supported & (SUPPORTED_1000baseT_Half |
  				SUPPORTED_1000baseT_Full)) {
  		if (advertise & SUPPORTED_1000baseT_Half)
  			adv |= ADVERTISE_1000HALF;
  		if (advertise & SUPPORTED_1000baseT_Full)
  			adv |= ADVERTISE_1000FULL;
  	}
  
  	if (adv != oldadv)
  		changed = 1;
  
  	err = phy_write(phydev, MDIO_DEVAD_NONE, MII_CTRL1000, adv);
  	if (err < 0)
  		return err;
  
  	return changed;
  }
  
  /**
   * genphy_setup_forced - configures/forces speed/duplex from @phydev
   * @phydev: target phy_device struct
   *
   * Description: Configures MII_BMCR to force speed/duplex
   *   to the values in phydev. Assumes that the values are valid.
   */
  static int genphy_setup_forced(struct phy_device *phydev)
  {
  	int err;
  	int ctl = BMCR_ANRESTART;
  
  	phydev->pause = 0;
  	phydev->asym_pause = 0;
  
  	if (phydev->speed == SPEED_1000)
  		ctl |= BMCR_SPEED1000;
  	else if (phydev->speed == SPEED_100)
  		ctl |= BMCR_SPEED100;
  
  	if (phydev->duplex == DUPLEX_FULL)
  		ctl |= BMCR_FULLDPLX;
  
  	err = phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, ctl);
  
  	return err;
  }
  
  /**
   * genphy_restart_aneg - Enable and Restart Autonegotiation
   * @phydev: target phy_device struct
   */
  int genphy_restart_aneg(struct phy_device *phydev)
  {
  	int ctl;
  
  	ctl = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
  
  	if (ctl < 0)
  		return ctl;
  
  	ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
  
  	/* Don't isolate the PHY if we're negotiating */
  	ctl &= ~(BMCR_ISOLATE);
  
  	ctl = phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, ctl);
  
  	return ctl;
  }
  
  /**
   * genphy_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.
   */
  int genphy_config_aneg(struct phy_device *phydev)
  {
  	int result;
  
  	if (phydev->autoneg != AUTONEG_ENABLE)
  		return genphy_setup_forced(phydev);
  
  	result = genphy_config_advert(phydev);
  
  	if (result < 0) /* error */
  		return result;
  
  	if (result == 0) {
  		/*
  		 * Advertisment hasn't changed, but maybe aneg was never on to
  		 * begin with?  Or maybe phy was isolated?
  		 */
  		int ctl = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
  
  		if (ctl < 0)
  			return ctl;
  
  		if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
  			result = 1; /* do restart aneg */
  	}
  
  	/*
  	 * Only restart aneg if we are advertising something different
  	 * than we were before.
  	 */
  	if (result > 0)
  		result = genphy_restart_aneg(phydev);
  
  	return result;
  }
  
  /**
   * genphy_update_link - update link status in @phydev
   * @phydev: target phy_device struct
   *
   * Description: Update the value in phydev->link to reflect the
   *   current link value.  In order to do this, we need to read
   *   the status register twice, keeping the second value.
   */
  int genphy_update_link(struct phy_device *phydev)
  {
  	unsigned int mii_reg;
  
  	/*
  	 * Wait if the link is up, and autonegotiation is in progress
  	 * (ie - we're capable and it's not done)
  	 */
  	mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
  
  	/*
  	 * If we already saw the link up, and it hasn't gone down, then
  	 * we don't need to wait for autoneg again
  	 */
  	if (phydev->link && mii_reg & BMSR_LSTATUS)
  		return 0;
  
  	if ((phydev->autoneg == AUTONEG_ENABLE) &&
  	    !(mii_reg & BMSR_ANEGCOMPLETE)) {
  		int i = 0;
  
  		printf("%s Waiting for PHY auto negotiation to complete",
  		       phydev->dev->name);
  		while (!(mii_reg & BMSR_ANEGCOMPLETE)) {
  			/*
  			 * Timeout reached ?
  			 */
  			if (i > PHY_ANEG_TIMEOUT) {
  				printf(" TIMEOUT !\n");
  				phydev->link = 0;
  				return -ETIMEDOUT;
  			}
  
  			if (ctrlc()) {
  				puts("user interrupt!\n");
  				phydev->link = 0;
  				return -EINTR;
  			}
  
  			if ((i++ % 500) == 0)
  				printf(".");
  
  			udelay(1000);	/* 1 ms */
  			mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
  		}
  		printf(" done\n");
  		phydev->link = 1;
  	} else {
  		/* Read the link a second time to clear the latched state */
  		mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
  
  		if (mii_reg & BMSR_LSTATUS)
  			phydev->link = 1;
  		else
  			phydev->link = 0;
  	}
  
  	return 0;
  }
  
  /*
   * Generic function which updates the speed and duplex.  If
   * autonegotiation is enabled, it uses the AND of the link
   * partner's advertised capabilities and our advertised
   * capabilities.  If autonegotiation is disabled, we use the
   * appropriate bits in the control register.
   *
   * Stolen from Linux's mii.c and phy_device.c
   */
  int genphy_parse_link(struct phy_device *phydev)
  {
  	int mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
  
  	/* We're using autonegotiation */
  	if (phydev->autoneg == AUTONEG_ENABLE) {
  		u32 lpa = 0;
  		int gblpa = 0;
  		u32 estatus = 0;
  
  		/* Check for gigabit capability */
  		if (phydev->supported & (SUPPORTED_1000baseT_Full |
  					SUPPORTED_1000baseT_Half)) {
  			/* We want a list of states supported by
  			 * both PHYs in the link
  			 */
  			gblpa = phy_read(phydev, MDIO_DEVAD_NONE, MII_STAT1000);
  			if (gblpa < 0) {
  				debug("Could not read MII_STAT1000. ");
  				debug("Ignoring gigabit capability\n");
  				gblpa = 0;
  			}
  			gblpa &= phy_read(phydev,
  					MDIO_DEVAD_NONE, MII_CTRL1000) << 2;
  		}
  
  		/* Set the baseline so we only have to set them
  		 * if they're different
  		 */
  		phydev->speed = SPEED_10;
  		phydev->duplex = DUPLEX_HALF;
  
  		/* Check the gigabit fields */
  		if (gblpa & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD)) {
  			phydev->speed = SPEED_1000;
  
  			if (gblpa & PHY_1000BTSR_1000FD)
  				phydev->duplex = DUPLEX_FULL;
  
  			/* We're done! */
  			return 0;
  		}
  
  		lpa = phy_read(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE);
  		lpa &= phy_read(phydev, MDIO_DEVAD_NONE, MII_LPA);
  
  		if (lpa & (LPA_100FULL | LPA_100HALF)) {
  			phydev->speed = SPEED_100;
  
  			if (lpa & LPA_100FULL)
  				phydev->duplex = DUPLEX_FULL;
  
  		} else if (lpa & LPA_10FULL) {
  			phydev->duplex = DUPLEX_FULL;
  		}
  
  		/*
  		 * Extended status may indicate that the PHY supports
  		 * 1000BASE-T/X even though the 1000BASE-T registers
  		 * are missing. In this case we can't tell whether the
  		 * peer also supports it, so we only check extended
  		 * status if the 1000BASE-T registers are actually
  		 * missing.
  		 */
  		if ((mii_reg & BMSR_ESTATEN) && !(mii_reg & BMSR_ERCAP))
  			estatus = phy_read(phydev, MDIO_DEVAD_NONE,
  					   MII_ESTATUS);
  
  		if (estatus & (ESTATUS_1000_XFULL | ESTATUS_1000_XHALF |
  				ESTATUS_1000_TFULL | ESTATUS_1000_THALF)) {
  			phydev->speed = SPEED_1000;
  			if (estatus & (ESTATUS_1000_XFULL | ESTATUS_1000_TFULL))
  				phydev->duplex = DUPLEX_FULL;
  		}
  
  	} else {
  		u32 bmcr = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
  
  		phydev->speed = SPEED_10;
  		phydev->duplex = DUPLEX_HALF;
  
  		if (bmcr & BMCR_FULLDPLX)
  			phydev->duplex = DUPLEX_FULL;
  
  		if (bmcr & BMCR_SPEED1000)
  			phydev->speed = SPEED_1000;
  		else if (bmcr & BMCR_SPEED100)
  			phydev->speed = SPEED_100;
  	}
  
  	return 0;
  }
  
  int genphy_config(struct phy_device *phydev)
  {
  	int val;
  	u32 features;
  
  	features = (SUPPORTED_TP | SUPPORTED_MII
  			| SUPPORTED_AUI | SUPPORTED_FIBRE |
  			SUPPORTED_BNC);
  
  	/* Do we support autonegotiation? */
  	val = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
  
  	if (val < 0)
  		return val;
  
  	if (val & BMSR_ANEGCAPABLE)
  		features |= SUPPORTED_Autoneg;
  
  	if (val & BMSR_100FULL)
  		features |= SUPPORTED_100baseT_Full;
  	if (val & BMSR_100HALF)
  		features |= SUPPORTED_100baseT_Half;
  	if (val & BMSR_10FULL)
  		features |= SUPPORTED_10baseT_Full;
  	if (val & BMSR_10HALF)
  		features |= SUPPORTED_10baseT_Half;
  
  	if (val & BMSR_ESTATEN) {
  		val = phy_read(phydev, MDIO_DEVAD_NONE, MII_ESTATUS);
  
  		if (val < 0)
  			return val;
  
  		if (val & ESTATUS_1000_TFULL)
  			features |= SUPPORTED_1000baseT_Full;
  		if (val & ESTATUS_1000_THALF)
  			features |= SUPPORTED_1000baseT_Half;
  		if (val & ESTATUS_1000_XFULL)
  			features |= SUPPORTED_1000baseX_Full;
  		if (val & ESTATUS_1000_XHALF)
  			features |= SUPPORTED_1000baseX_Half;
  	}
  
  	phydev->supported &= features;
  	phydev->advertising &= features;
  
  	genphy_config_aneg(phydev);
  
  	return 0;
  }
  
  int genphy_startup(struct phy_device *phydev)
  {
  	int ret;
  
  	ret = genphy_update_link(phydev);
  	if (ret)
  		return ret;
  
  	return genphy_parse_link(phydev);
  }
  
  int genphy_shutdown(struct phy_device *phydev)
  {
  	return 0;
  }
  
  static struct phy_driver genphy_driver = {
  	.uid		= 0xffffffff,
  	.mask		= 0xffffffff,
  	.name		= "Generic PHY",
  	.features	= PHY_GBIT_FEATURES | SUPPORTED_MII |
  			  SUPPORTED_AUI | SUPPORTED_FIBRE |
  			  SUPPORTED_BNC,
  	.config		= genphy_config,
  	.startup	= genphy_startup,
  	.shutdown	= genphy_shutdown,
  };
  
  static LIST_HEAD(phy_drivers);
  
  int phy_init(void)
  {
  #ifdef CONFIG_B53_SWITCH
  	phy_b53_init();
  #endif
  #ifdef CONFIG_MV88E61XX_SWITCH
  	phy_mv88e61xx_init();
  #endif
  #ifdef CONFIG_PHY_AQUANTIA
  	phy_aquantia_init();
  #endif
  #ifdef CONFIG_PHY_ATHEROS
  	phy_atheros_init();
  #endif
  #ifdef CONFIG_PHY_BROADCOM
  	phy_broadcom_init();
  #endif
  #ifdef CONFIG_PHY_CORTINA
  	phy_cortina_init();
  #endif
  #ifdef CONFIG_PHY_DAVICOM
  	phy_davicom_init();
  #endif
  #ifdef CONFIG_PHY_ET1011C
  	phy_et1011c_init();
  #endif
  #ifdef CONFIG_PHY_LXT
  	phy_lxt_init();
  #endif
  #ifdef CONFIG_PHY_MARVELL
  	phy_marvell_init();
  #endif
  #ifdef CONFIG_PHY_MICREL_KSZ8XXX
  	phy_micrel_ksz8xxx_init();
  #endif
  #ifdef CONFIG_PHY_MICREL_KSZ90X1
  	phy_micrel_ksz90x1_init();
  #endif
  #ifdef CONFIG_PHY_MESON_GXL
  	phy_meson_gxl_init();
  #endif
  #ifdef CONFIG_PHY_NATSEMI
  	phy_natsemi_init();
  #endif
  #ifdef CONFIG_PHY_REALTEK
  	phy_realtek_init();
  #endif
  #ifdef CONFIG_PHY_SMSC
  	phy_smsc_init();
  #endif
  #ifdef CONFIG_PHY_TERANETICS
  	phy_teranetics_init();
  #endif
  #ifdef CONFIG_PHY_TI
  	phy_ti_init();
  #endif
  #ifdef CONFIG_PHY_VITESSE
  	phy_vitesse_init();
  #endif
  #ifdef CONFIG_PHY_XILINX
  	phy_xilinx_init();
  #endif
  #ifdef CONFIG_PHY_MSCC
  	phy_mscc_init();
  #endif
  #ifdef CONFIG_PHY_FIXED
  	phy_fixed_init();
  #endif
  	return 0;
  }
  
  int phy_register(struct phy_driver *drv)
  {
  	INIT_LIST_HEAD(&drv->list);
  	list_add_tail(&drv->list, &phy_drivers);
  
  #ifdef CONFIG_NEEDS_MANUAL_RELOC
  	if (drv->probe)
  		drv->probe += gd->reloc_off;
  	if (drv->config)
  		drv->config += gd->reloc_off;
  	if (drv->startup)
  		drv->startup += gd->reloc_off;
  	if (drv->shutdown)
  		drv->shutdown += gd->reloc_off;
  	if (drv->readext)
  		drv->readext += gd->reloc_off;
  	if (drv->writeext)
  		drv->writeext += gd->reloc_off;
  #endif
  	return 0;
  }
  
  int phy_set_supported(struct phy_device *phydev, u32 max_speed)
  {
  	/* The default values for phydev->supported are provided by the PHY
  	 * driver "features" member, we want to reset to sane defaults first
  	 * before supporting higher speeds.
  	 */
  	phydev->supported &= PHY_DEFAULT_FEATURES;
  
  	switch (max_speed) {
  	default:
  		return -ENOTSUPP;
  	case SPEED_1000:
  		phydev->supported |= PHY_1000BT_FEATURES;
  		/* fall through */
  	case SPEED_100:
  		phydev->supported |= PHY_100BT_FEATURES;
  		/* fall through */
  	case SPEED_10:
  		phydev->supported |= PHY_10BT_FEATURES;
  	}
  
  	return 0;
  }
  
  static int phy_probe(struct phy_device *phydev)
  {
  	int err = 0;
  
  	phydev->advertising = phydev->drv->features;
  	phydev->supported = phydev->drv->features;
  
  	phydev->mmds = phydev->drv->mmds;
  
  	if (phydev->drv->probe)
  		err = phydev->drv->probe(phydev);
  
  	return err;
  }
  
  static struct phy_driver *generic_for_interface(phy_interface_t interface)
  {
  #ifdef CONFIG_PHYLIB_10G
  	if (is_10g_interface(interface))
  		return &gen10g_driver;
  #endif
  
  	return &genphy_driver;
  }
  
  static struct phy_driver *get_phy_driver(struct phy_device *phydev,
  					 phy_interface_t interface)
  {
  	struct list_head *entry;
  	int phy_id = phydev->phy_id;
  	struct phy_driver *drv = NULL;
  
  	list_for_each(entry, &phy_drivers) {
  		drv = list_entry(entry, struct phy_driver, list);
  		if ((drv->uid & drv->mask) == (phy_id & drv->mask))
  			return drv;
  	}
  
  	/* If we made it here, there's no driver for this PHY */
  	return generic_for_interface(interface);
  }
  
  static struct phy_device *phy_device_create(struct mii_dev *bus, int addr,
  					    u32 phy_id,
  					    phy_interface_t interface)
  {
  	struct phy_device *dev;
  
  	/*
  	 * We allocate the device, and initialize the
  	 * default values
  	 */
  	dev = malloc(sizeof(*dev));
  	if (!dev) {
  		printf("Failed to allocate PHY device for %s:%d\n",
  		       bus->name, addr);
  		return NULL;
  	}
  
  	memset(dev, 0, sizeof(*dev));
  
  	dev->duplex = -1;
  	dev->link = 0;
  	dev->interface = interface;
  
  #ifdef CONFIG_DM_ETH
  	dev->node = ofnode_null();
  #endif
  
  	dev->autoneg = AUTONEG_ENABLE;
  
  	dev->addr = addr;
  	dev->phy_id = phy_id;
  	dev->bus = bus;
  
  	dev->drv = get_phy_driver(dev, interface);
  
  	phy_probe(dev);
  
  	if (addr >= 0 && addr < PHY_MAX_ADDR)
  		bus->phymap[addr] = dev;
  
  	return dev;
  }
  
  /**
   * get_phy_id - reads the specified addr for its ID.
   * @bus: the target MII bus
   * @addr: PHY address on the MII bus
   * @phy_id: where to store the ID retrieved.
   *
   * Description: Reads the ID registers of the PHY at @addr on the
   *   @bus, stores it in @phy_id and returns zero on success.
   */
  int __weak get_phy_id(struct mii_dev *bus, int addr, int devad, u32 *phy_id)
  {
  	int phy_reg;
  
  	/*
  	 * Grab the bits from PHYIR1, and put them
  	 * in the upper half
  	 */
  	phy_reg = bus->read(bus, addr, devad, MII_PHYSID1);
  
  	if (phy_reg < 0)
  		return -EIO;
  
  	*phy_id = (phy_reg & 0xffff) << 16;
  
  	/* Grab the bits from PHYIR2, and put them in the lower half */
  	phy_reg = bus->read(bus, addr, devad, MII_PHYSID2);
  
  	if (phy_reg < 0)
  		return -EIO;
  
  	*phy_id |= (phy_reg & 0xffff);
  
  	return 0;
  }
  
  static struct phy_device *create_phy_by_mask(struct mii_dev *bus,
  					     uint phy_mask, int devad,
  					     phy_interface_t interface)
  {
  	u32 phy_id = 0xffffffff;
  
  	while (phy_mask) {
  		int addr = ffs(phy_mask) - 1;
  		int r = get_phy_id(bus, addr, devad, &phy_id);
  		/* If the PHY ID is mostly f's, we didn't find anything */
  		if (r == 0 && (phy_id & 0x1fffffff) != 0x1fffffff)
  			return phy_device_create(bus, addr, phy_id, interface);
  		phy_mask &= ~(1 << addr);
  	}
  	return NULL;
  }
  
  static struct phy_device *search_for_existing_phy(struct mii_dev *bus,
  						  uint phy_mask,
  						  phy_interface_t interface)
  {
  	/* If we have one, return the existing device, with new interface */
  	while (phy_mask) {
  		int addr = ffs(phy_mask) - 1;
  
  		if (bus->phymap[addr]) {
  			bus->phymap[addr]->interface = interface;
  			return bus->phymap[addr];
  		}
  		phy_mask &= ~(1 << addr);
  	}
  	return NULL;
  }
  
  static struct phy_device *get_phy_device_by_mask(struct mii_dev *bus,
  						 uint phy_mask,
  						 phy_interface_t interface)
  {
  	int i;
  	struct phy_device *phydev;
  
  	phydev = search_for_existing_phy(bus, phy_mask, interface);
  	if (phydev)
  		return phydev;
  	/* Try Standard (ie Clause 22) access */
  	/* Otherwise we have to try Clause 45 */
  	for (i = 0; i < 5; i++) {
  		phydev = create_phy_by_mask(bus, phy_mask,
  					    i ? i : MDIO_DEVAD_NONE, interface);
  		if (IS_ERR(phydev))
  			return NULL;
  		if (phydev)
  			return phydev;
  	}
  
  	debug("\n%s PHY: ", bus->name);
  	while (phy_mask) {
  		int addr = ffs(phy_mask) - 1;
  
  		debug("%d ", addr);
  		phy_mask &= ~(1 << addr);
  	}
  	debug("not found\n");
  
  	return NULL;
  }
  
  /**
   * get_phy_device - reads the specified PHY device and returns its
   *                  @phy_device struct
   * @bus: the target MII bus
   * @addr: PHY address on the MII bus
   *
   * Description: Reads the ID registers of the PHY at @addr on the
   *   @bus, then allocates and returns the phy_device to represent it.
   */
  static struct phy_device *get_phy_device(struct mii_dev *bus, int addr,
  					 phy_interface_t interface)
  {
  	return get_phy_device_by_mask(bus, 1 << addr, interface);
  }
  
  int phy_reset(struct phy_device *phydev)
  {
  	int reg;
  	int timeout = 500;
  	int devad = MDIO_DEVAD_NONE;
  
  	if (phydev->flags & PHY_FLAG_BROKEN_RESET)
  		return 0;
  
  #ifdef CONFIG_PHYLIB_10G
  	/* If it's 10G, we need to issue reset through one of the MMDs */
  	if (is_10g_interface(phydev->interface)) {
  		if (!phydev->mmds)
  			gen10g_discover_mmds(phydev);
  
  		devad = ffs(phydev->mmds) - 1;
  	}
  #endif
  
  	if (phy_write(phydev, devad, MII_BMCR, BMCR_RESET) < 0) {
  		debug("PHY reset failed\n");
  		return -1;
  	}
  
  #ifdef CONFIG_PHY_RESET_DELAY
  	udelay(CONFIG_PHY_RESET_DELAY);	/* Intel LXT971A needs this */
  #endif
  	/*
  	 * Poll the control register for the reset bit to go to 0 (it is
  	 * auto-clearing).  This should happen within 0.5 seconds per the
  	 * IEEE spec.
  	 */
  	reg = phy_read(phydev, devad, MII_BMCR);
  	while ((reg & BMCR_RESET) && timeout--) {
  		reg = phy_read(phydev, devad, MII_BMCR);
  
  		if (reg < 0) {
  			debug("PHY status read failed\n");
  			return -1;
  		}
  		udelay(1000);
  	}
  
  	if (reg & BMCR_RESET) {
  		puts("PHY reset timed out\n");
  		return -1;
  	}
  
  	return 0;
  }
  
  int miiphy_reset(const char *devname, unsigned char addr)
  {
  	struct mii_dev *bus = miiphy_get_dev_by_name(devname);
  	struct phy_device *phydev;
  
  	/*
  	 * miiphy_reset was only used on standard PHYs, so we'll fake it here.
  	 * If later code tries to connect with the right interface, this will
  	 * be corrected by get_phy_device in phy_connect()
  	 */
  	phydev = get_phy_device(bus, addr, PHY_INTERFACE_MODE_MII);
  
  	return phy_reset(phydev);
  }
  
  struct phy_device *phy_find_by_mask(struct mii_dev *bus, uint phy_mask,
  				    phy_interface_t interface)
  {
  	/* Reset the bus */
  	if (bus->reset) {
  		bus->reset(bus);
  
  		/* Wait 15ms to make sure the PHY has come out of hard reset */
  		mdelay(15);
  	}
  
  	return get_phy_device_by_mask(bus, phy_mask, interface);
  }
  
  #ifdef CONFIG_DM_ETH
  void phy_connect_dev(struct phy_device *phydev, struct udevice *dev)
  #else
  void phy_connect_dev(struct phy_device *phydev, struct eth_device *dev)
  #endif
  {
  	/* Soft Reset the PHY */
  	phy_reset(phydev);
  	if (phydev->dev && phydev->dev != dev) {
  		printf("%s:%d is connected to %s.  Reconnecting to %s\n",
  		       phydev->bus->name, phydev->addr,
  		       phydev->dev->name, dev->name);
  	}
  	phydev->dev = dev;
  	debug("%s connected to %s\n", dev->name, phydev->drv->name);
  }
  
  #ifdef CONFIG_DM_ETH
  struct phy_device *phy_connect(struct mii_dev *bus, int addr,
  			       struct udevice *dev,
  			       phy_interface_t interface)
  #else
  struct phy_device *phy_connect(struct mii_dev *bus, int addr,
  			       struct eth_device *dev,
  			       phy_interface_t interface)
  #endif
  {
  	struct phy_device *phydev = NULL;
  #ifdef CONFIG_PHY_FIXED
  	int sn;
  	const char *name;
  
  	sn = fdt_first_subnode(gd->fdt_blob, dev_of_offset(dev));
  	while (sn > 0) {
  		name = fdt_get_name(gd->fdt_blob, sn, NULL);
  		if (name && strcmp(name, "fixed-link") == 0) {
  			phydev = phy_device_create(bus,
  						   sn, PHY_FIXED_ID, interface);
  			break;
  		}
  		sn = fdt_next_subnode(gd->fdt_blob, sn);
  	}
  #endif
  	if (!phydev)
  		phydev = phy_find_by_mask(bus, 1 << addr, interface);
  
  	if (phydev)
  		phy_connect_dev(phydev, dev);
  	else
  		printf("Could not get PHY for %s: addr %d\n", bus->name, addr);
  	return phydev;
  }
  
  /*
   * Start the PHY.  Returns 0 on success, or a negative error code.
   */
  int phy_startup(struct phy_device *phydev)
  {
  	if (phydev->drv->startup)
  		return phydev->drv->startup(phydev);
  
  	return 0;
  }
  
  __weak int board_phy_config(struct phy_device *phydev)
  {
  	if (phydev->drv->config)
  		return phydev->drv->config(phydev);
  	return 0;
  }
  
  int phy_config(struct phy_device *phydev)
  {
  	/* Invoke an optional board-specific helper */
  	return board_phy_config(phydev);
  }
  
  int phy_shutdown(struct phy_device *phydev)
  {
  	if (phydev->drv->shutdown)
  		phydev->drv->shutdown(phydev);
  
  	return 0;
  }
  
  int phy_get_interface_by_name(const char *str)
  {
  	int i;
  
  	for (i = 0; i < PHY_INTERFACE_MODE_COUNT; i++) {
  		if (!strcmp(str, phy_interface_strings[i]))
  			return i;
  	}
  
  	return -1;
  }
  