/*
   * (C) Copyright 2001
   * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
   *

   * SPDX-License-Identifier:	GPL-2.0+

   */
  
  /*
   * This provides a bit-banged interface to the ethernet MII management
   * channel.
   */
  
  #include <common.h>
  #include <miiphy.h>

  #include <phy.h>

  #include <asm/types.h>
  #include <linux/list.h>
  #include <malloc.h>
  #include <net.h>
  
  /* local debug macro */

  #undef MII_DEBUG
  
  #undef debug
  #ifdef MII_DEBUG

  #define debug(fmt, args...)	printf(fmt, ##args)

  #else

  #define debug(fmt, args...)

  #endif /* MII_DEBUG */

  static struct list_head mii_devs;
  static struct mii_dev *current_mii;

  /*
   * Lookup the mii_dev struct by the registered device name.
   */

  struct mii_dev *miiphy_get_dev_by_name(const char *devname)

  {
  	struct list_head *entry;
  	struct mii_dev *dev;
  
  	if (!devname) {
  		printf("NULL device name!
  ");
  		return NULL;
  	}
  
  	list_for_each(entry, &mii_devs) {
  		dev = list_entry(entry, struct mii_dev, link);
  		if (strcmp(dev->name, devname) == 0)
  			return dev;
  	}

  	return NULL;
  }

  /*****************************************************************************
   *

   * Initialize global data. Need to be called before any other miiphy routine.
   */

  void miiphy_init(void)

  {

  	INIT_LIST_HEAD(&mii_devs);

  	current_mii = NULL;

  }

  static int legacy_miiphy_read(struct mii_dev *bus, int addr, int devad, int reg)
  {
  	unsigned short val;
  	int ret;
  	struct legacy_mii_dev *ldev = bus->priv;
  
  	ret = ldev->read(bus->name, addr, reg, &val);
  
  	return ret ? -1 : (int)val;
  }
  
  static int legacy_miiphy_write(struct mii_dev *bus, int addr, int devad,
  				int reg, u16 val)
  {
  	struct legacy_mii_dev *ldev = bus->priv;
  
  	return ldev->write(bus->name, addr, reg, val);
  }

  /*****************************************************************************
   *

   * Register read and write MII access routines for the device <name>.

   * This API is now deprecated. Please use mdio_alloc and mdio_register, instead.

   */

  void miiphy_register(const char *name,

  		      int (*read)(const char *devname, unsigned char addr,

  				   unsigned char reg, unsigned short *value),

  		      int (*write)(const char *devname, unsigned char addr,

  				    unsigned char reg, unsigned short value))

  {

  	struct mii_dev *new_dev;

  	struct legacy_mii_dev *ldev;

  
  	BUG_ON(strlen(name) >= MDIO_NAME_LEN);

  	/* check if we have unique name */

  	new_dev = miiphy_get_dev_by_name(name);

  	if (new_dev) {
  		printf("miiphy_register: non unique device name '%s'
  ", name);
  		return;

  	}
  
  	/* allocate memory */

  	new_dev = mdio_alloc();
  	ldev = malloc(sizeof(*ldev));

  	if (new_dev == NULL || ldev == NULL) {

  		printf("miiphy_register: cannot allocate memory for '%s'
  ",

  			name);

  		return;
  	}

  
  	/* initalize mii_dev struct fields */

  	new_dev->read = legacy_miiphy_read;
  	new_dev->write = legacy_miiphy_write;

  	strncpy(new_dev->name, name, MDIO_NAME_LEN);
  	new_dev->name[MDIO_NAME_LEN - 1] = 0;

  	ldev->read = read;
  	ldev->write = write;
  	new_dev->priv = ldev;

  	debug("miiphy_register: added '%s', read=0x%08lx, write=0x%08lx
  ",

  	       new_dev->name, ldev->read, ldev->write);

  
  	/* add it to the list */

  	list_add_tail(&new_dev->link, &mii_devs);

  
  	if (!current_mii)
  		current_mii = new_dev;
  }

  struct mii_dev *mdio_alloc(void)
  {
  	struct mii_dev *bus;
  
  	bus = malloc(sizeof(*bus));
  	if (!bus)
  		return bus;
  
  	memset(bus, 0, sizeof(*bus));
  
  	/* initalize mii_dev struct fields */
  	INIT_LIST_HEAD(&bus->link);
  
  	return bus;
  }
  
  int mdio_register(struct mii_dev *bus)
  {
  	if (!bus || !bus->name || !bus->read || !bus->write)
  		return -1;
  
  	/* check if we have unique name */
  	if (miiphy_get_dev_by_name(bus->name)) {
  		printf("mdio_register: non unique device name '%s'
  ",
  			bus->name);
  		return -1;
  	}
  
  	/* add it to the list */
  	list_add_tail(&bus->link, &mii_devs);
  
  	if (!current_mii)
  		current_mii = bus;
  
  	return 0;
  }
  
  void mdio_list_devices(void)
  {
  	struct list_head *entry;
  
  	list_for_each(entry, &mii_devs) {
  		int i;
  		struct mii_dev *bus = list_entry(entry, struct mii_dev, link);
  
  		printf("%s:
  ", bus->name);
  
  		for (i = 0; i < PHY_MAX_ADDR; i++) {
  			struct phy_device *phydev = bus->phymap[i];
  
  			if (phydev) {
  				printf("%d - %s", i, phydev->drv->name);
  
  				if (phydev->dev)
  					printf(" <--> %s
  ", phydev->dev->name);
  				else
  					printf("
  ");
  			}
  		}
  	}
  }

  int miiphy_set_current_dev(const char *devname)

  {

  	struct mii_dev *dev;

  	dev = miiphy_get_dev_by_name(devname);

  	if (dev) {
  		current_mii = dev;
  		return 0;

  	}

  	printf("No such device: %s
  ", devname);

  	return 1;
  }

  struct mii_dev *mdio_get_current_dev(void)
  {
  	return current_mii;
  }
  
  struct phy_device *mdio_phydev_for_ethname(const char *ethname)
  {
  	struct list_head *entry;
  	struct mii_dev *bus;
  
  	list_for_each(entry, &mii_devs) {
  		int i;
  		bus = list_entry(entry, struct mii_dev, link);
  
  		for (i = 0; i < PHY_MAX_ADDR; i++) {
  			if (!bus->phymap[i] || !bus->phymap[i]->dev)
  				continue;
  
  			if (strcmp(bus->phymap[i]->dev->name, ethname) == 0)
  				return bus->phymap[i];
  		}
  	}
  
  	printf("%s is not a known ethernet
  ", ethname);
  	return NULL;
  }

  const char *miiphy_get_current_dev(void)

  {
  	if (current_mii)
  		return current_mii->name;
  
  	return NULL;
  }

  static struct mii_dev *miiphy_get_active_dev(const char *devname)
  {
  	/* If the current mii is the one we want, return it */
  	if (current_mii)
  		if (strcmp(current_mii->name, devname) == 0)
  			return current_mii;
  
  	/* Otherwise, set the active one to the one we want */
  	if (miiphy_set_current_dev(devname))
  		return NULL;
  	else
  		return current_mii;
  }

  /*****************************************************************************
   *
   * Read to variable <value> from the PHY attached to device <devname>,
   * use PHY address <addr> and register <reg>.
   *

   * This API is deprecated. Use phy_read on a phy_device found via phy_connect
   *

   * Returns:
   *   0 on success
   */

  int miiphy_read(const char *devname, unsigned char addr, unsigned char reg,

  		 unsigned short *value)

  {

  	struct mii_dev *bus;

  	int ret;

  	bus = miiphy_get_active_dev(devname);

  	if (!bus)

  		return 1;

  	ret = bus->read(bus, addr, MDIO_DEVAD_NONE, reg);
  	if (ret < 0)
  		return 1;
  
  	*value = (unsigned short)ret;
  	return 0;

  }
  
  /*****************************************************************************
   *
   * Write <value> to the PHY attached to device <devname>,
   * use PHY address <addr> and register <reg>.
   *

   * This API is deprecated. Use phy_write on a phy_device found by phy_connect
   *

   * Returns:
   *   0 on success
   */

  int miiphy_write(const char *devname, unsigned char addr, unsigned char reg,

  		  unsigned short value)

  {

  	struct mii_dev *bus;

  	bus = miiphy_get_active_dev(devname);
  	if (bus)
  		return bus->write(bus, addr, MDIO_DEVAD_NONE, reg, value);

  	return 1;

  }
  
  /*****************************************************************************
   *
   * Print out list of registered MII capable devices.
   */

  void miiphy_listdev(void)

  {
  	struct list_head *entry;
  	struct mii_dev *dev;

  	puts("MII devices: ");
  	list_for_each(entry, &mii_devs) {
  		dev = list_entry(entry, struct mii_dev, link);
  		printf("'%s' ", dev->name);

  	}

  	puts("
  ");

  
  	if (current_mii)

  		printf("Current device: '%s'
  ", current_mii->name);

  }

  /*****************************************************************************
   *
   * Read the OUI, manufacture's model number, and revision number.
   *
   * OUI:     22 bits (unsigned int)
   * Model:    6 bits (unsigned char)
   * Revision: 4 bits (unsigned char)
   *

   * This API is deprecated.
   *

   * Returns:
   *   0 on success
   */

  int miiphy_info(const char *devname, unsigned char addr, unsigned int *oui,

  		 unsigned char *model, unsigned char *rev)
  {
  	unsigned int reg = 0;

  	unsigned short tmp;

  	if (miiphy_read(devname, addr, MII_PHYSID2, &tmp) != 0) {
  		debug("PHY ID register 2 read failed
  ");
  		return -1;

  	}

  	reg = tmp;

  	debug("MII_PHYSID2 @ 0x%x = 0x%04x
  ", addr, reg);

  	if (reg == 0xFFFF) {
  		/* No physical device present at this address */

  		return -1;

  	}

  	if (miiphy_read(devname, addr, MII_PHYSID1, &tmp) != 0) {
  		debug("PHY ID register 1 read failed
  ");
  		return -1;

  	}

  	reg |= tmp << 16;

  	debug("PHY_PHYIDR[1,2] @ 0x%x = 0x%08x
  ", addr, reg);

  	*oui = (reg >> 10);
  	*model = (unsigned char)((reg >> 4) & 0x0000003F);
  	*rev = (unsigned char)(reg & 0x0000000F);

  	return 0;

  }

  #ifndef CONFIG_PHYLIB

  /*****************************************************************************
   *
   * Reset the PHY.

   *
   * This API is deprecated. Use PHYLIB.
   *

   * Returns:
   *   0 on success
   */

  int miiphy_reset(const char *devname, unsigned char addr)

  {
  	unsigned short reg;

  	int timeout = 500;

  	if (miiphy_read(devname, addr, MII_BMCR, &reg) != 0) {
  		debug("PHY status read failed
  ");
  		return -1;

  	}

  	if (miiphy_write(devname, addr, MII_BMCR, reg | BMCR_RESET) != 0) {
  		debug("PHY reset failed
  ");
  		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 = 0x8000;

  	while (((reg & 0x8000) != 0) && timeout--) {

  		if (miiphy_read(devname, addr, MII_BMCR, &reg) != 0) {

  			debug("PHY status read failed
  ");
  			return -1;

  		}

  		udelay(1000);

  	}
  	if ((reg & 0x8000) == 0) {

  		return 0;

  	} else {

  		puts("PHY reset timed out
  ");
  		return -1;

  	}

  	return 0;

  }

  #endif /* !PHYLIB */

  /*****************************************************************************
   *

   * Determine the ethernet speed (10/100/1000).  Return 10 on error.

   */

  int miiphy_speed(const char *devname, unsigned char addr)

  {

  	u16 bmcr, anlpar;

  #if defined(CONFIG_PHY_GIGE)

  	u16 btsr;
  
  	/*
  	 * Check for 1000BASE-X.  If it is supported, then assume that the speed
  	 * is 1000.
  	 */

  	if (miiphy_is_1000base_x(devname, addr))

  		return _1000BASET;

  	/*
  	 * No 1000BASE-X, so assume 1000BASE-T/100BASE-TX/10BASE-T register set.
  	 */
  	/* Check for 1000BASE-T. */

  	if (miiphy_read(devname, addr, MII_STAT1000, &btsr)) {
  		printf("PHY 1000BT status");

  		goto miiphy_read_failed;
  	}
  	if (btsr != 0xFFFF &&

  			(btsr & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD)))

  		return _1000BASET;

  #endif /* CONFIG_PHY_GIGE */

  	/* Check Basic Management Control Register first. */

  	if (miiphy_read(devname, addr, MII_BMCR, &bmcr)) {
  		printf("PHY speed");

  		goto miiphy_read_failed;

  	}

  	/* Check if auto-negotiation is on. */

  	if (bmcr & BMCR_ANENABLE) {

  		/* Get auto-negotiation results. */

  		if (miiphy_read(devname, addr, MII_LPA, &anlpar)) {
  			printf("PHY AN speed");

  			goto miiphy_read_failed;

  		}

  		return (anlpar & LPA_100) ? _100BASET : _10BASET;

  	}
  	/* Get speed from basic control settings. */

  	return (bmcr & BMCR_SPEED100) ? _100BASET : _10BASET;

  miiphy_read_failed:

  	printf(" read failed, assuming 10BASE-T
  ");

  	return _10BASET;

  }

  /*****************************************************************************
   *

   * Determine full/half duplex.  Return half on error.

   */

  int miiphy_duplex(const char *devname, unsigned char addr)

  {

  	u16 bmcr, anlpar;

  #if defined(CONFIG_PHY_GIGE)

  	u16 btsr;
  
  	/* Check for 1000BASE-X. */

  	if (miiphy_is_1000base_x(devname, addr)) {

  		/* 1000BASE-X */

  		if (miiphy_read(devname, addr, MII_LPA, &anlpar)) {
  			printf("1000BASE-X PHY AN duplex");

  			goto miiphy_read_failed;
  		}
  	}
  	/*
  	 * No 1000BASE-X, so assume 1000BASE-T/100BASE-TX/10BASE-T register set.
  	 */
  	/* Check for 1000BASE-T. */

  	if (miiphy_read(devname, addr, MII_STAT1000, &btsr)) {
  		printf("PHY 1000BT status");

  		goto miiphy_read_failed;
  	}
  	if (btsr != 0xFFFF) {
  		if (btsr & PHY_1000BTSR_1000FD) {
  			return FULL;
  		} else if (btsr & PHY_1000BTSR_1000HD) {
  			return HALF;

  		}
  	}

  #endif /* CONFIG_PHY_GIGE */

  	/* Check Basic Management Control Register first. */

  	if (miiphy_read(devname, addr, MII_BMCR, &bmcr)) {
  		puts("PHY duplex");

  		goto miiphy_read_failed;

  	}

  	/* Check if auto-negotiation is on. */

  	if (bmcr & BMCR_ANENABLE) {

  		/* Get auto-negotiation results. */

  		if (miiphy_read(devname, addr, MII_LPA, &anlpar)) {
  			puts("PHY AN duplex");

  			goto miiphy_read_failed;

  		}

  		return (anlpar & (LPA_10FULL | LPA_100FULL)) ?

  		    FULL : HALF;

  	}
  	/* Get speed from basic control settings. */

  	return (bmcr & BMCR_FULLDPLX) ? FULL : HALF;

  miiphy_read_failed:

  	printf(" read failed, assuming half duplex
  ");

  	return HALF;
  }

  /*****************************************************************************
   *
   * Return 1 if PHY supports 1000BASE-X, 0 if PHY supports 10BASE-T/100BASE-TX/
   * 1000BASE-T, or on error.
   */

  int miiphy_is_1000base_x(const char *devname, unsigned char addr)

  {
  #if defined(CONFIG_PHY_GIGE)
  	u16 exsr;

  	if (miiphy_read(devname, addr, MII_ESTATUS, &exsr)) {
  		printf("PHY extended status read failed, assuming no "

  			"1000BASE-X
  ");
  		return 0;
  	}

  	return 0 != (exsr & (ESTATUS_1000XF | ESTATUS_1000XH));

  #else
  	return 0;
  #endif

  }

  #ifdef CONFIG_SYS_FAULT_ECHO_LINK_DOWN

  /*****************************************************************************
   *
   * Determine link status
   */

  int miiphy_link(const char *devname, unsigned char addr)

  {
  	unsigned short reg;

  	/* dummy read; needed to latch some phys */

  	(void)miiphy_read(devname, addr, MII_BMSR, &reg);
  	if (miiphy_read(devname, addr, MII_BMSR, &reg)) {
  		puts("MII_BMSR read failed, assuming no link
  ");
  		return 0;

  	}
  
  	/* Determine if a link is active */

  	if ((reg & BMSR_LSTATUS) != 0) {

  		return 1;

  	} else {

  		return 0;

  	}
  }
  #endif