// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2009-2010, 2013 Freescale Semiconductor, Inc.
 *      Jun-jie Zhang <b18070@freescale.com>
 *      Mingkai Hu <Mingkai.hu@freescale.com>
 */

#include <common.h>
#include <miiphy.h>
#include <phy.h>
#include <fsl_mdio.h>
#include <asm/io.h>
#include <linux/errno.h>

#ifdef CONFIG_DM_MDIO
struct tsec_mdio_priv {
        struct tsec_mii_mng __iomem *regs;
};
#endif

void tsec_local_mdio_write(struct tsec_mii_mng __iomem *phyregs, int port_addr,
                int dev_addr, int regnum, int value)
{
        int timeout = 1000000;

        out_be32(&phyregs->miimadd, (port_addr << 8) | (regnum & 0x1f));
        out_be32(&phyregs->miimcon, value);
        /* Memory barrier */
        mb();

        while ((in_be32(&phyregs->miimind) & MIIMIND_BUSY) && timeout--)
                ;
}

int tsec_local_mdio_read(struct tsec_mii_mng __iomem *phyregs, int port_addr,
                int dev_addr, int regnum)
{
        int value;
        int timeout = 1000000;

        /* Put the address of the phy, and the register number into MIIMADD */
        out_be32(&phyregs->miimadd, (port_addr << 8) | (regnum & 0x1f));

        /* Clear the command register, and wait */
        out_be32(&phyregs->miimcom, 0);
        /* Memory barrier */
        mb();

        /* Initiate a read command, and wait */
        out_be32(&phyregs->miimcom, MIIMCOM_READ_CYCLE);
        /* Memory barrier */
        mb();

        /* Wait for the the indication that the read is done */
        while ((in_be32(&phyregs->miimind) & (MIIMIND_NOTVALID | MIIMIND_BUSY))
                        && timeout--)
                ;

        /* Grab the value read from the PHY */
        value = in_be32(&phyregs->miimstat);

        return value;
}

#if defined(CONFIG_PHYLIB)
static int fsl_pq_mdio_reset(struct mii_dev *bus)
{
        struct tsec_mii_mng __iomem *regs;
#ifndef CONFIG_DM_MDIO
        regs = (struct tsec_mii_mng __iomem *)bus->priv;
#else
        struct tsec_mdio_priv *priv;

        if (!bus->priv)
                return -EINVAL;

        priv = dev_get_priv(bus->priv);
        regs = priv->regs;
#endif

        /* Reset MII (due to new addresses) */
        out_be32(&regs->miimcfg, MIIMCFG_RESET_MGMT);

        out_be32(&regs->miimcfg, MIIMCFG_INIT_VALUE);

        while (in_be32(&regs->miimind) & MIIMIND_BUSY)
                ;

        return 0;
}
#endif

int tsec_phy_read(struct mii_dev *bus, int addr, int dev_addr, int regnum)
{
        struct tsec_mii_mng __iomem *phyregs;
#ifndef CONFIG_DM_MDIO
        phyregs = (struct tsec_mii_mng __iomem *)bus->priv;
#else
        struct tsec_mdio_priv *priv;

        if (!bus->priv)
                return -EINVAL;

        priv = dev_get_priv(bus->priv);
        phyregs = priv->regs;
#endif

        return tsec_local_mdio_read(phyregs, addr, dev_addr, regnum);
}

int tsec_phy_write(struct mii_dev *bus, int addr, int dev_addr, int regnum,
                        u16 value)
{
        struct tsec_mii_mng __iomem *phyregs;
#ifndef CONFIG_DM_MDIO
        phyregs = (struct tsec_mii_mng __iomem *)bus->priv;
#else
        struct tsec_mdio_priv *priv;

        if (!bus->priv)
                return -EINVAL;

        priv = dev_get_priv(bus->priv);
        phyregs = priv->regs;
#endif

        tsec_local_mdio_write(phyregs, addr, dev_addr, regnum, value);

        return 0;
}

#ifndef CONFIG_DM_MDIO
int fsl_pq_mdio_init(bd_t *bis, struct fsl_pq_mdio_info *info)
{
        struct mii_dev *bus = mdio_alloc();

        if (!bus) {
                printf("Failed to allocate FSL MDIO bus\n");
                return -1;
        }

        bus->read = tsec_phy_read;
        bus->write = tsec_phy_write;
        bus->reset = fsl_pq_mdio_reset;
        strcpy(bus->name, info->name);

        bus->priv = (void *)info->regs;

        return mdio_register(bus);
}
#else /* CONFIG_DM_MDIO */
#if defined(CONFIG_PHYLIB)
static int tsec_mdio_read(struct udevice *dev, int addr, int devad, int reg)
{
        struct mdio_perdev_priv *pdata = (dev) ? dev_get_uclass_priv(dev) :
                                                 NULL;

        if (pdata && pdata->mii_bus)
                return tsec_phy_read(pdata->mii_bus, addr, devad, reg);

        return -1;
}

static int tsec_mdio_write(struct udevice *dev, int addr, int devad, int reg,
                           u16 val)
{
        struct mdio_perdev_priv *pdata = (dev) ? dev_get_uclass_priv(dev) :
                                                 NULL;

        if (pdata && pdata->mii_bus)
                return tsec_phy_write(pdata->mii_bus, addr, devad, reg, val);

        return -1;
}

static int tsec_mdio_reset(struct udevice *dev)
{
        struct mdio_perdev_priv *pdata = (dev) ? dev_get_uclass_priv(dev) :
                                                 NULL;

        if (pdata && pdata->mii_bus)
                return fsl_pq_mdio_reset(pdata->mii_bus);

        return -1;
}

static const struct mdio_ops tsec_mdio_ops = {
        .read = tsec_mdio_read,
        .write = tsec_mdio_write,
        .reset = tsec_mdio_reset,
};

static const struct udevice_id tsec_mdio_ids[] = {
        { .compatible = "fsl,gianfar-tbi" },
        { .compatible = "fsl,gianfar-mdio" },
        { .compatible = "fsl,etsec2-tbi" },
        { .compatible = "fsl,etsec2-mdio" },
        { .compatible = "fsl,fman-mdio" },
        {}
};

static int tsec_mdio_probe(struct udevice *dev)
{
        struct tsec_mdio_priv *priv = (dev) ? dev_get_priv(dev) : NULL;
        struct mdio_perdev_priv *pdata = (dev) ? dev_get_uclass_priv(dev) :
                                                 NULL;

        if (!dev) {
                printf("%s dev = NULL\n", __func__);
                return -1;
        }
        if (!priv) {
                printf("dev_get_priv(dev %p) = NULL\n", dev);
                return -1;
        }
        priv->regs = (void *)(uintptr_t)dev_read_addr(dev);
        debug("%s priv %p @ regs %p, pdata %p\n", __func__,
              priv, priv->regs, pdata);

        return 0;
}

static int tsec_mdio_remove(struct udevice *dev)
{
        return 0;
}

U_BOOT_DRIVER(tsec_mdio) = {
        .name = "tsec_mdio",
        .id = UCLASS_MDIO,
        .of_match = tsec_mdio_ids,
        .probe = tsec_mdio_probe,
        .remove = tsec_mdio_remove,
        .ops = &tsec_mdio_ops,
        .priv_auto_alloc_size = sizeof(struct tsec_mdio_priv),
        .platdata_auto_alloc_size = sizeof(struct mdio_perdev_priv),
};
#endif /* CONFIG_PHYLIB */
#endif /* CONFIG_DM_MDIO */