/*
 * (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!\n");
                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'\n", 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'\n",
                        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\n",
               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'\n",
                        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:\n", 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\n", phydev->dev->name);
                                else
                                        printf("\n");
                        }
                }
        }
}

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\n", 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\n", 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("\n");

        if (current_mii)
                printf("Current device: '%s'\n", 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\n");
                return -1;
        }
        reg = tmp;

        debug("MII_PHYSID2 @ 0x%x = 0x%04x\n", 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\n");
                return -1;
        }
        reg |= tmp << 16;
        debug("PHY_PHYIDR[1,2] @ 0x%x = 0x%08x\n", 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\n");
                return -1;
        }
        if (miiphy_write(devname, addr, MII_BMCR, reg | 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 = 0x8000;
        while (((reg & 0x8000) != 0) && timeout--) {
                if (miiphy_read(devname, addr, MII_BMCR, &reg) != 0) {
                        debug("PHY status read failed\n");
                        return -1;
                }
                udelay(1000);
        }
        if ((reg & 0x8000) == 0) {
                return 0;
        } else {
                puts("PHY reset timed out\n");
                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\n");
        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\n");
        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\n");
                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\n");
                return 0;
        }

        /* Determine if a link is active */
        if ((reg & BMSR_LSTATUS) != 0) {
                return 1;
        } else {
                return 0;
        }
}
#endif