// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2011 Michal Simek
 *
 * Michal SIMEK <monstr@monstr.eu>
 *
 * Based on Xilinx gmac driver:
 * (C) Copyright 2011 Xilinx
 */

#include <clk.h>
#include <common.h>
#include <cpu_func.h>
#include <dm.h>
#include <log.h>
#include <net.h>
#include <netdev.h>
#include <config.h>
#include <console.h>
#include <malloc.h>
#include <asm/cache.h>
#include <asm/io.h>
#include <phy.h>
#include <miiphy.h>
#include <wait_bit.h>
#include <watchdog.h>
#include <asm/system.h>
#include <asm/arch/hardware.h>
#include <asm/arch/sys_proto.h>
#include <dm/device_compat.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/errno.h>

/* Bit/mask specification */
#define ZYNQ_GEM_PHYMNTNC_OP_MASK       0x40020000 /* operation mask bits */
#define ZYNQ_GEM_PHYMNTNC_OP_R_MASK     0x20000000 /* read operation */
#define ZYNQ_GEM_PHYMNTNC_OP_W_MASK     0x10000000 /* write operation */
#define ZYNQ_GEM_PHYMNTNC_PHYAD_SHIFT_MASK      23 /* Shift bits for PHYAD */
#define ZYNQ_GEM_PHYMNTNC_PHREG_SHIFT_MASK      18 /* Shift bits for PHREG */

#define ZYNQ_GEM_RXBUF_EOF_MASK         0x00008000 /* End of frame. */
#define ZYNQ_GEM_RXBUF_SOF_MASK         0x00004000 /* Start of frame. */
#define ZYNQ_GEM_RXBUF_LEN_MASK         0x00003FFF /* Mask for length field */

#define ZYNQ_GEM_RXBUF_WRAP_MASK        0x00000002 /* Wrap bit, last BD */
#define ZYNQ_GEM_RXBUF_NEW_MASK         0x00000001 /* Used bit.. */
#define ZYNQ_GEM_RXBUF_ADD_MASK         0xFFFFFFFC /* Mask for address */

/* Wrap bit, last descriptor */
#define ZYNQ_GEM_TXBUF_WRAP_MASK        0x40000000
#define ZYNQ_GEM_TXBUF_LAST_MASK        0x00008000 /* Last buffer */
#define ZYNQ_GEM_TXBUF_USED_MASK        0x80000000 /* Used by Hw */

#define ZYNQ_GEM_NWCTRL_TXEN_MASK       0x00000008 /* Enable transmit */
#define ZYNQ_GEM_NWCTRL_RXEN_MASK       0x00000004 /* Enable receive */
#define ZYNQ_GEM_NWCTRL_MDEN_MASK       0x00000010 /* Enable MDIO port */
#define ZYNQ_GEM_NWCTRL_STARTTX_MASK    0x00000200 /* Start tx (tx_go) */

#define ZYNQ_GEM_NWCFG_SPEED100         0x00000001 /* 100 Mbps operation */
#define ZYNQ_GEM_NWCFG_SPEED1000        0x00000400 /* 1Gbps operation */
#define ZYNQ_GEM_NWCFG_FDEN             0x00000002 /* Full Duplex mode */
#define ZYNQ_GEM_NWCFG_FSREM            0x00020000 /* FCS removal */
#define ZYNQ_GEM_NWCFG_SGMII_ENBL       0x08000000 /* SGMII Enable */
#define ZYNQ_GEM_NWCFG_PCS_SEL          0x00000800 /* PCS select */
#ifdef CONFIG_ARM64
#define ZYNQ_GEM_NWCFG_MDCCLKDIV        0x00100000 /* Div pclk by 64, max 160MHz */
#else
#define ZYNQ_GEM_NWCFG_MDCCLKDIV        0x000c0000 /* Div pclk by 48, max 120MHz */
#endif

#ifdef CONFIG_ARM64
# define ZYNQ_GEM_DBUS_WIDTH    (1 << 21) /* 64 bit bus */
#else
# define ZYNQ_GEM_DBUS_WIDTH    (0 << 21) /* 32 bit bus */
#endif

#define ZYNQ_GEM_NWCFG_INIT             (ZYNQ_GEM_DBUS_WIDTH | \
                                        ZYNQ_GEM_NWCFG_FDEN | \
                                        ZYNQ_GEM_NWCFG_FSREM | \
                                        ZYNQ_GEM_NWCFG_MDCCLKDIV)

#define ZYNQ_GEM_NWSR_MDIOIDLE_MASK     0x00000004 /* PHY management idle */

#define ZYNQ_GEM_DMACR_BLENGTH          0x00000004 /* INCR4 AHB bursts */
/* Use full configured addressable space (8 Kb) */
#define ZYNQ_GEM_DMACR_RXSIZE           0x00000300
/* Use full configured addressable space (4 Kb) */
#define ZYNQ_GEM_DMACR_TXSIZE           0x00000400
/* Set with binary 00011000 to use 1536 byte(1*max length frame/buffer) */
#define ZYNQ_GEM_DMACR_RXBUF            0x00180000

#if defined(CONFIG_PHYS_64BIT)
# define ZYNQ_GEM_DMA_BUS_WIDTH         BIT(30) /* 64 bit bus */
#else
# define ZYNQ_GEM_DMA_BUS_WIDTH         (0 << 30) /* 32 bit bus */
#endif

#define ZYNQ_GEM_DMACR_INIT             (ZYNQ_GEM_DMACR_BLENGTH | \
                                        ZYNQ_GEM_DMACR_RXSIZE | \
                                        ZYNQ_GEM_DMACR_TXSIZE | \
                                        ZYNQ_GEM_DMACR_RXBUF | \
                                        ZYNQ_GEM_DMA_BUS_WIDTH)

#define ZYNQ_GEM_TSR_DONE               0x00000020 /* Tx done mask */

#define ZYNQ_GEM_PCS_CTL_ANEG_ENBL      0x1000

#define ZYNQ_GEM_DCFG_DBG6_DMA_64B      BIT(23)

/* Use MII register 1 (MII status register) to detect PHY */
#define PHY_DETECT_REG  1

/* Mask used to verify certain PHY features (or register contents)
 * in the register above:
 *  0x1000: 10Mbps full duplex support
 *  0x0800: 10Mbps half duplex support
 *  0x0008: Auto-negotiation support
 */
#define PHY_DETECT_MASK 0x1808

/* TX BD status masks */
#define ZYNQ_GEM_TXBUF_FRMLEN_MASK      0x000007ff
#define ZYNQ_GEM_TXBUF_EXHAUSTED        0x08000000
#define ZYNQ_GEM_TXBUF_UNDERRUN         0x10000000

/* Clock frequencies for different speeds */
#define ZYNQ_GEM_FREQUENCY_10   2500000UL
#define ZYNQ_GEM_FREQUENCY_100  25000000UL
#define ZYNQ_GEM_FREQUENCY_1000 125000000UL

#define RXCLK_EN                BIT(0)

/* Device registers */
struct zynq_gem_regs {
        u32 nwctrl; /* 0x0 - Network Control reg */
        u32 nwcfg; /* 0x4 - Network Config reg */
        u32 nwsr; /* 0x8 - Network Status reg */
        u32 reserved1;
        u32 dmacr; /* 0x10 - DMA Control reg */
        u32 txsr; /* 0x14 - TX Status reg */
        u32 rxqbase; /* 0x18 - RX Q Base address reg */
        u32 txqbase; /* 0x1c - TX Q Base address reg */
        u32 rxsr; /* 0x20 - RX Status reg */
        u32 reserved2[2];
        u32 idr; /* 0x2c - Interrupt Disable reg */
        u32 reserved3;
        u32 phymntnc; /* 0x34 - Phy Maintaince reg */
        u32 reserved4[18];
        u32 hashl; /* 0x80 - Hash Low address reg */
        u32 hashh; /* 0x84 - Hash High address reg */
#define LADDR_LOW       0
#define LADDR_HIGH      1
        u32 laddr[4][LADDR_HIGH + 1]; /* 0x8c - Specific1 addr low/high reg */
        u32 match[4]; /* 0xa8 - Type ID1 Match reg */
        u32 reserved6[18];
#define STAT_SIZE       44
        u32 stat[STAT_SIZE]; /* 0x100 - Octects transmitted Low reg */
        u32 reserved9[20];
        u32 pcscntrl;
        u32 rserved12[36];
        u32 dcfg6; /* 0x294 Design config reg6 */
        u32 reserved7[106];
        u32 transmit_q1_ptr; /* 0x440 - Transmit priority queue 1 */
        u32 reserved8[15];
        u32 receive_q1_ptr; /* 0x480 - Receive priority queue 1 */
        u32 reserved10[17];
        u32 upper_txqbase; /* 0x4C8 - Upper tx_q base addr */
        u32 reserved11[2];
        u32 upper_rxqbase; /* 0x4D4 - Upper rx_q base addr */
};

/* BD descriptors */
struct emac_bd {
        u32 addr; /* Next descriptor pointer */
        u32 status;
#if defined(CONFIG_PHYS_64BIT)
        u32 addr_hi;
        u32 reserved;
#endif
};

/* Reduce amount of BUFs if you have limited amount of memory */
#define RX_BUF 32
/* Page table entries are set to 1MB, or multiples of 1MB
 * (not < 1MB). driver uses less bd's so use 1MB bdspace.
 */
#define BD_SPACE        0x100000
/* BD separation space */
#define BD_SEPRN_SPACE  (RX_BUF * sizeof(struct emac_bd))

/* Setup the first free TX descriptor */
#define TX_FREE_DESC    2

/* Initialized, rxbd_current, rx_first_buf must be 0 after init */
struct zynq_gem_priv {
        struct emac_bd *tx_bd;
        struct emac_bd *rx_bd;
        char *rxbuffers;
        u32 rxbd_current;
        u32 rx_first_buf;
        int phyaddr;
        int init;
        struct zynq_gem_regs *iobase;
        struct zynq_gem_regs *mdiobase;
        phy_interface_t interface;
        struct phy_device *phydev;
        ofnode phy_of_node;
        struct mii_dev *bus;
        struct clk rx_clk;
        struct clk tx_clk;
        u32 max_speed;
        bool int_pcs;
        bool dma_64bit;
        u32 clk_en_info;
};

static int phy_setup_op(struct zynq_gem_priv *priv, u32 phy_addr, u32 regnum,
                        u32 op, u16 *data)
{
        u32 mgtcr;
        struct zynq_gem_regs *regs = priv->mdiobase;
        int err;

        err = wait_for_bit_le32(&regs->nwsr, ZYNQ_GEM_NWSR_MDIOIDLE_MASK,
                                true, 20000, false);
        if (err)
                return err;

        /* Construct mgtcr mask for the operation */
        mgtcr = ZYNQ_GEM_PHYMNTNC_OP_MASK | op |
                (phy_addr << ZYNQ_GEM_PHYMNTNC_PHYAD_SHIFT_MASK) |
                (regnum << ZYNQ_GEM_PHYMNTNC_PHREG_SHIFT_MASK) | *data;

        /* Write mgtcr and wait for completion */
        writel(mgtcr, &regs->phymntnc);

        err = wait_for_bit_le32(&regs->nwsr, ZYNQ_GEM_NWSR_MDIOIDLE_MASK,
                                true, 20000, false);
        if (err)
                return err;

        if (op == ZYNQ_GEM_PHYMNTNC_OP_R_MASK)
                *data = readl(&regs->phymntnc);

        return 0;
}

static int phyread(struct zynq_gem_priv *priv, u32 phy_addr,
                   u32 regnum, u16 *val)
{
        int ret;

        ret = phy_setup_op(priv, phy_addr, regnum,
                           ZYNQ_GEM_PHYMNTNC_OP_R_MASK, val);

        if (!ret)
                debug("%s: phy_addr %d, regnum 0x%x, val 0x%x\n", __func__,
                      phy_addr, regnum, *val);

        return ret;
}

static int phywrite(struct zynq_gem_priv *priv, u32 phy_addr,
                    u32 regnum, u16 data)
{
        debug("%s: phy_addr %d, regnum 0x%x, data 0x%x\n", __func__, phy_addr,
              regnum, data);

        return phy_setup_op(priv, phy_addr, regnum,
                            ZYNQ_GEM_PHYMNTNC_OP_W_MASK, &data);
}

static int zynq_gem_setup_mac(struct udevice *dev)
{
        u32 i, macaddrlow, macaddrhigh;
        struct eth_pdata *pdata = dev_get_plat(dev);
        struct zynq_gem_priv *priv = dev_get_priv(dev);
        struct zynq_gem_regs *regs = priv->iobase;

        /* Set the MAC bits [31:0] in BOT */
        macaddrlow = pdata->enetaddr[0];
        macaddrlow |= pdata->enetaddr[1] << 8;
        macaddrlow |= pdata->enetaddr[2] << 16;
        macaddrlow |= pdata->enetaddr[3] << 24;

        /* Set MAC bits [47:32] in TOP */
        macaddrhigh = pdata->enetaddr[4];
        macaddrhigh |= pdata->enetaddr[5] << 8;

        for (i = 0; i < 4; i++) {
                writel(0, &regs->laddr[i][LADDR_LOW]);
                writel(0, &regs->laddr[i][LADDR_HIGH]);
                /* Do not use MATCHx register */
                writel(0, &regs->match[i]);
        }

        writel(macaddrlow, &regs->laddr[0][LADDR_LOW]);
        writel(macaddrhigh, &regs->laddr[0][LADDR_HIGH]);

        return 0;
}

static int zynq_phy_init(struct udevice *dev)
{
        int ret;
        struct zynq_gem_priv *priv = dev_get_priv(dev);
        struct zynq_gem_regs *regs_mdio = priv->mdiobase;
        const u32 supported = SUPPORTED_10baseT_Half |
                        SUPPORTED_10baseT_Full |
                        SUPPORTED_100baseT_Half |
                        SUPPORTED_100baseT_Full |
                        SUPPORTED_1000baseT_Half |
                        SUPPORTED_1000baseT_Full;

        /* Enable only MDIO bus */
        writel(ZYNQ_GEM_NWCTRL_MDEN_MASK, &regs_mdio->nwctrl);

        priv->phydev = phy_connect(priv->bus, priv->phyaddr, dev,
                                   priv->interface);
        if (!priv->phydev)
                return -ENODEV;

        if (priv->max_speed) {
                ret = phy_set_supported(priv->phydev, priv->max_speed);
                if (ret)
                        return ret;
        }

        priv->phydev->supported &= supported | ADVERTISED_Pause |
                                  ADVERTISED_Asym_Pause;

        priv->phydev->advertising = priv->phydev->supported;
        priv->phydev->node = priv->phy_of_node;

        return phy_config(priv->phydev);
}

static int zynq_gem_init(struct udevice *dev)
{
        u32 i, nwconfig;
        int ret;
        unsigned long clk_rate = 0;
        struct zynq_gem_priv *priv = dev_get_priv(dev);
        struct zynq_gem_regs *regs = priv->iobase;
        struct zynq_gem_regs *regs_mdio = priv->mdiobase;
        struct emac_bd *dummy_tx_bd = &priv->tx_bd[TX_FREE_DESC];
        struct emac_bd *dummy_rx_bd = &priv->tx_bd[TX_FREE_DESC + 2];

        if (readl(&regs->dcfg6) & ZYNQ_GEM_DCFG_DBG6_DMA_64B)
                priv->dma_64bit = true;
        else
                priv->dma_64bit = false;

#if defined(CONFIG_PHYS_64BIT)
        if (!priv->dma_64bit) {
                printf("ERR: %s: Using 64-bit DMA but HW doesn't support it\n",
                       __func__);
                return -EINVAL;
        }
#else
        if (priv->dma_64bit)
                debug("WARN: %s: Not using 64-bit dma even HW supports it\n",
                      __func__);
#endif

        if (!priv->init) {
                /* Disable all interrupts */
                writel(0xFFFFFFFF, &regs->idr);

                /* Disable the receiver & transmitter */
                writel(0, &regs->nwctrl);
                writel(0, &regs->txsr);
                writel(0, &regs->rxsr);
                writel(0, &regs->phymntnc);

                /* Clear the Hash registers for the mac address
                 * pointed by AddressPtr
                 */
                writel(0x0, &regs->hashl);
                /* Write bits [63:32] in TOP */
                writel(0x0, &regs->hashh);

                /* Clear all counters */
                for (i = 0; i < STAT_SIZE; i++)
                        readl(&regs->stat[i]);

                /* Setup RxBD space */
                memset(priv->rx_bd, 0, RX_BUF * sizeof(struct emac_bd));

                for (i = 0; i < RX_BUF; i++) {
                        priv->rx_bd[i].status = 0xF0000000;
                        priv->rx_bd[i].addr =
                                        (lower_32_bits((ulong)(priv->rxbuffers)
                                                        + (i * PKTSIZE_ALIGN)));
#if defined(CONFIG_PHYS_64BIT)
                        priv->rx_bd[i].addr_hi =
                                        (upper_32_bits((ulong)(priv->rxbuffers)
                                                        + (i * PKTSIZE_ALIGN)));
#endif
        }
                /* WRAP bit to last BD */
                priv->rx_bd[--i].addr |= ZYNQ_GEM_RXBUF_WRAP_MASK;
                /* Write RxBDs to IP */
                writel(lower_32_bits((ulong)priv->rx_bd), &regs->rxqbase);
#if defined(CONFIG_PHYS_64BIT)
                writel(upper_32_bits((ulong)priv->rx_bd), &regs->upper_rxqbase);
#endif

                /* Setup for DMA Configuration register */
                writel(ZYNQ_GEM_DMACR_INIT, &regs->dmacr);

                /* Setup for Network Control register, MDIO, Rx and Tx enable */
                setbits_le32(&regs_mdio->nwctrl, ZYNQ_GEM_NWCTRL_MDEN_MASK);

                /* Disable the second priority queue */
                dummy_tx_bd->addr = 0;
#if defined(CONFIG_PHYS_64BIT)
                dummy_tx_bd->addr_hi = 0;
#endif
                dummy_tx_bd->status = ZYNQ_GEM_TXBUF_WRAP_MASK |
                                ZYNQ_GEM_TXBUF_LAST_MASK|
                                ZYNQ_GEM_TXBUF_USED_MASK;

                dummy_rx_bd->addr = ZYNQ_GEM_RXBUF_WRAP_MASK |
                                ZYNQ_GEM_RXBUF_NEW_MASK;
#if defined(CONFIG_PHYS_64BIT)
                dummy_rx_bd->addr_hi = 0;
#endif
                dummy_rx_bd->status = 0;

                writel((ulong)dummy_tx_bd, &regs->transmit_q1_ptr);
                writel((ulong)dummy_rx_bd, &regs->receive_q1_ptr);

                priv->init++;
        }

        ret = phy_startup(priv->phydev);
        if (ret)
                return ret;

        if (!priv->phydev->link) {
                printf("%s: No link.\n", priv->phydev->dev->name);
                return -1;
        }

        nwconfig = ZYNQ_GEM_NWCFG_INIT;

        /*
         * Set SGMII enable PCS selection only if internal PCS/PMA
         * core is used and interface is SGMII.
         */
        if (priv->interface == PHY_INTERFACE_MODE_SGMII &&
            priv->int_pcs) {
                nwconfig |= ZYNQ_GEM_NWCFG_SGMII_ENBL |
                            ZYNQ_GEM_NWCFG_PCS_SEL;
        }

        switch (priv->phydev->speed) {
        case SPEED_1000:
                writel(nwconfig | ZYNQ_GEM_NWCFG_SPEED1000,
                       &regs->nwcfg);
                clk_rate = ZYNQ_GEM_FREQUENCY_1000;
                break;
        case SPEED_100:
                writel(nwconfig | ZYNQ_GEM_NWCFG_SPEED100,
                       &regs->nwcfg);
                clk_rate = ZYNQ_GEM_FREQUENCY_100;
                break;
        case SPEED_10:
                clk_rate = ZYNQ_GEM_FREQUENCY_10;
                break;
        }

#ifdef CONFIG_ARM64
        if (priv->interface == PHY_INTERFACE_MODE_SGMII &&
            priv->int_pcs) {
                /*
                 * Disable AN for fixed link configuration, enable otherwise.
                 * Must be written after PCS_SEL is set in nwconfig,
                 * otherwise writes will not take effect.
                 */
                if (priv->phydev->phy_id != PHY_FIXED_ID)
                        writel(readl(&regs->pcscntrl) | ZYNQ_GEM_PCS_CTL_ANEG_ENBL,
                               &regs->pcscntrl);
                else
                        writel(readl(&regs->pcscntrl) & ~ZYNQ_GEM_PCS_CTL_ANEG_ENBL,
                               &regs->pcscntrl);
        }
#endif

        ret = clk_set_rate(&priv->tx_clk, clk_rate);
        if (IS_ERR_VALUE(ret)) {
                dev_err(dev, "failed to set tx clock rate\n");
                return ret;
        }

        ret = clk_enable(&priv->tx_clk);
        if (ret) {
                dev_err(dev, "failed to enable tx clock\n");
                return ret;
        }

        if (priv->clk_en_info & RXCLK_EN) {
                ret = clk_enable(&priv->rx_clk);
                if (ret) {
                        dev_err(dev, "failed to enable rx clock\n");
                        return ret;
                }
        }
        setbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_RXEN_MASK |
                                        ZYNQ_GEM_NWCTRL_TXEN_MASK);

        return 0;
}

static int zynq_gem_send(struct udevice *dev, void *ptr, int len)
{
        dma_addr_t addr;
        u32 size;
        struct zynq_gem_priv *priv = dev_get_priv(dev);
        struct zynq_gem_regs *regs = priv->iobase;
        struct emac_bd *current_bd = &priv->tx_bd[1];

        /* Setup Tx BD */
        memset(priv->tx_bd, 0, sizeof(struct emac_bd));

        priv->tx_bd->addr = lower_32_bits((ulong)ptr);
#if defined(CONFIG_PHYS_64BIT)
        priv->tx_bd->addr_hi = upper_32_bits((ulong)ptr);
#endif
        priv->tx_bd->status = (len & ZYNQ_GEM_TXBUF_FRMLEN_MASK) |
                               ZYNQ_GEM_TXBUF_LAST_MASK;
        /* Dummy descriptor to mark it as the last in descriptor chain */
        current_bd->addr = 0x0;
#if defined(CONFIG_PHYS_64BIT)
        current_bd->addr_hi = 0x0;
#endif
        current_bd->status = ZYNQ_GEM_TXBUF_WRAP_MASK |
                             ZYNQ_GEM_TXBUF_LAST_MASK|
                             ZYNQ_GEM_TXBUF_USED_MASK;

        /* setup BD */
        writel(lower_32_bits((ulong)priv->tx_bd), &regs->txqbase);
#if defined(CONFIG_PHYS_64BIT)
        writel(upper_32_bits((ulong)priv->tx_bd), &regs->upper_txqbase);
#endif

        addr = (ulong) ptr;
        addr &= ~(ARCH_DMA_MINALIGN - 1);
        size = roundup(len, ARCH_DMA_MINALIGN);
        flush_dcache_range(addr, addr + size);
        barrier();

        /* Start transmit */
        setbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_STARTTX_MASK);

        /* Read TX BD status */
        if (priv->tx_bd->status & ZYNQ_GEM_TXBUF_EXHAUSTED)
                printf("TX buffers exhausted in mid frame\n");

        return wait_for_bit_le32(&regs->txsr, ZYNQ_GEM_TSR_DONE,
                                 true, 20000, true);
}

/* Do not check frame_recd flag in rx_status register 0x20 - just poll BD */
static int zynq_gem_recv(struct udevice *dev, int flags, uchar **packetp)
{
        int frame_len;
        dma_addr_t addr;
        struct zynq_gem_priv *priv = dev_get_priv(dev);
        struct emac_bd *current_bd = &priv->rx_bd[priv->rxbd_current];

        if (!(current_bd->addr & ZYNQ_GEM_RXBUF_NEW_MASK))
                return -1;

        if (!(current_bd->status &
                        (ZYNQ_GEM_RXBUF_SOF_MASK | ZYNQ_GEM_RXBUF_EOF_MASK))) {
                printf("GEM: SOF or EOF not set for last buffer received!\n");
                return -1;
        }

        frame_len = current_bd->status & ZYNQ_GEM_RXBUF_LEN_MASK;
        if (!frame_len) {
                printf("%s: Zero size packet?\n", __func__);
                return -1;
        }

#if defined(CONFIG_PHYS_64BIT)
        addr = (dma_addr_t)((current_bd->addr & ZYNQ_GEM_RXBUF_ADD_MASK)
                      | ((dma_addr_t)current_bd->addr_hi << 32));
#else
        addr = current_bd->addr & ZYNQ_GEM_RXBUF_ADD_MASK;
#endif
        addr &= ~(ARCH_DMA_MINALIGN - 1);

        *packetp = (uchar *)(uintptr_t)addr;

        invalidate_dcache_range(addr, addr + roundup(PKTSIZE_ALIGN, ARCH_DMA_MINALIGN));
        barrier();

        return frame_len;
}

static int zynq_gem_free_pkt(struct udevice *dev, uchar *packet, int length)
{
        struct zynq_gem_priv *priv = dev_get_priv(dev);
        struct emac_bd *current_bd = &priv->rx_bd[priv->rxbd_current];
        struct emac_bd *first_bd;
        dma_addr_t addr;

        if (current_bd->status & ZYNQ_GEM_RXBUF_SOF_MASK) {
                priv->rx_first_buf = priv->rxbd_current;
        } else {
                current_bd->addr &= ~ZYNQ_GEM_RXBUF_NEW_MASK;
                current_bd->status = 0xF0000000; /* FIXME */
        }

        if (current_bd->status & ZYNQ_GEM_RXBUF_EOF_MASK) {
                first_bd = &priv->rx_bd[priv->rx_first_buf];
                first_bd->addr &= ~ZYNQ_GEM_RXBUF_NEW_MASK;
                first_bd->status = 0xF0000000;
        }

        /* Flush the cache for the packet as well */
#if defined(CONFIG_PHYS_64BIT)
        addr = (dma_addr_t)((current_bd->addr & ZYNQ_GEM_RXBUF_ADD_MASK)
                | ((dma_addr_t)current_bd->addr_hi << 32));
#else
        addr = current_bd->addr & ZYNQ_GEM_RXBUF_ADD_MASK;
#endif
        flush_dcache_range(addr, addr + roundup(PKTSIZE_ALIGN,
                                                ARCH_DMA_MINALIGN));
        barrier();

        if ((++priv->rxbd_current) >= RX_BUF)
                priv->rxbd_current = 0;

        return 0;
}

static void zynq_gem_halt(struct udevice *dev)
{
        struct zynq_gem_priv *priv = dev_get_priv(dev);
        struct zynq_gem_regs *regs = priv->iobase;

        clrsetbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_RXEN_MASK |
                                                ZYNQ_GEM_NWCTRL_TXEN_MASK, 0);
}

__weak int zynq_board_read_rom_ethaddr(unsigned char *ethaddr)
{
        return -ENOSYS;
}

static int zynq_gem_read_rom_mac(struct udevice *dev)
{
        struct eth_pdata *pdata = dev_get_plat(dev);

        if (!pdata)
                return -ENOSYS;

        return zynq_board_read_rom_ethaddr(pdata->enetaddr);
}

static int zynq_gem_miiphy_read(struct mii_dev *bus, int addr,
                                int devad, int reg)
{
        struct zynq_gem_priv *priv = bus->priv;
        int ret;
        u16 val = 0;

        ret = phyread(priv, addr, reg, &val);
        debug("%s 0x%x, 0x%x, 0x%x, 0x%x\n", __func__, addr, reg, val, ret);
        return val;
}

static int zynq_gem_miiphy_write(struct mii_dev *bus, int addr, int devad,
                                 int reg, u16 value)
{
        struct zynq_gem_priv *priv = bus->priv;

        debug("%s 0x%x, 0x%x, 0x%x\n", __func__, addr, reg, value);
        return phywrite(priv, addr, reg, value);
}

static int zynq_gem_probe(struct udevice *dev)
{
        void *bd_space;
        struct zynq_gem_priv *priv = dev_get_priv(dev);
        int ret;

        /* Align rxbuffers to ARCH_DMA_MINALIGN */
        priv->rxbuffers = memalign(ARCH_DMA_MINALIGN, RX_BUF * PKTSIZE_ALIGN);
        if (!priv->rxbuffers)
                return -ENOMEM;

        memset(priv->rxbuffers, 0, RX_BUF * PKTSIZE_ALIGN);
        ulong addr = (ulong)priv->rxbuffers;
        flush_dcache_range(addr, addr + roundup(RX_BUF * PKTSIZE_ALIGN, ARCH_DMA_MINALIGN));
        barrier();

        /* Align bd_space to MMU_SECTION_SHIFT */
        bd_space = memalign(1 << MMU_SECTION_SHIFT, BD_SPACE);
        if (!bd_space) {
                ret = -ENOMEM;
                goto err1;
        }

        mmu_set_region_dcache_behaviour((phys_addr_t)bd_space,
                                        BD_SPACE, DCACHE_OFF);

        /* Initialize the bd spaces for tx and rx bd's */
        priv->tx_bd = (struct emac_bd *)bd_space;
        priv->rx_bd = (struct emac_bd *)((ulong)bd_space + BD_SEPRN_SPACE);

        ret = clk_get_by_name(dev, "tx_clk", &priv->tx_clk);
        if (ret < 0) {
                dev_err(dev, "failed to get tx_clock\n");
                goto err2;
        }

        if (priv->clk_en_info & RXCLK_EN) {
                ret = clk_get_by_name(dev, "rx_clk", &priv->rx_clk);
                if (ret < 0) {
                        dev_err(dev, "failed to get rx_clock\n");
                        goto err2;
                }
        }

        priv->bus = mdio_alloc();
        priv->bus->read = zynq_gem_miiphy_read;
        priv->bus->write = zynq_gem_miiphy_write;
        priv->bus->priv = priv;

        ret = mdio_register_seq(priv->bus, dev_seq(dev));
        if (ret)
                goto err2;

        ret = zynq_phy_init(dev);
        if (ret)
                goto err3;

        return ret;

err3:
        mdio_unregister(priv->bus);
err2:
        free(priv->tx_bd);
err1:
        free(priv->rxbuffers);
        return ret;
}

static int zynq_gem_remove(struct udevice *dev)
{
        struct zynq_gem_priv *priv = dev_get_priv(dev);

        free(priv->phydev);
        mdio_unregister(priv->bus);
        mdio_free(priv->bus);

        return 0;
}

static const struct eth_ops zynq_gem_ops = {
        .start                  = zynq_gem_init,
        .send                   = zynq_gem_send,
        .recv                   = zynq_gem_recv,
        .free_pkt               = zynq_gem_free_pkt,
        .stop                   = zynq_gem_halt,
        .write_hwaddr           = zynq_gem_setup_mac,
        .read_rom_hwaddr        = zynq_gem_read_rom_mac,
};

static int zynq_gem_of_to_plat(struct udevice *dev)
{
        struct eth_pdata *pdata = dev_get_plat(dev);
        struct zynq_gem_priv *priv = dev_get_priv(dev);
        struct ofnode_phandle_args phandle_args;
        const char *phy_mode;

        pdata->iobase = (phys_addr_t)dev_read_addr(dev);
        priv->iobase = (struct zynq_gem_regs *)pdata->iobase;
        priv->mdiobase = priv->iobase;
        /* Hardcode for now */
        priv->phyaddr = -1;

        if (!dev_read_phandle_with_args(dev, "phy-handle", NULL, 0, 0,
                                        &phandle_args)) {
                fdt_addr_t addr;
                ofnode parent;

                debug("phy-handle does exist %s\n", dev->name);
                priv->phyaddr = ofnode_read_u32_default(phandle_args.node,
                                                        "reg", -1);
                priv->phy_of_node = phandle_args.node;
                priv->max_speed = ofnode_read_u32_default(phandle_args.node,
                                                          "max-speed",
                                                          SPEED_1000);

                parent = ofnode_get_parent(phandle_args.node);
                addr = ofnode_get_addr(parent);
                if (addr != FDT_ADDR_T_NONE) {
                        debug("MDIO bus not found %s\n", dev->name);
                        priv->mdiobase = (struct zynq_gem_regs *)addr;
                }
        }

        phy_mode = dev_read_prop(dev, "phy-mode", NULL);
        if (phy_mode)
                pdata->phy_interface = phy_get_interface_by_name(phy_mode);
        if (pdata->phy_interface == -1) {
                debug("%s: Invalid PHY interface '%s'\n", __func__, phy_mode);
                return -EINVAL;
        }
        priv->interface = pdata->phy_interface;

        priv->int_pcs = dev_read_bool(dev, "is-internal-pcspma");

        printf("\nZYNQ GEM: %lx, mdio bus %lx, phyaddr %d, interface %s\n",
               (ulong)priv->iobase, (ulong)priv->mdiobase, priv->phyaddr,
               phy_string_for_interface(priv->interface));

        priv->clk_en_info = dev_get_driver_data(dev);

        return 0;
}

static const struct udevice_id zynq_gem_ids[] = {
        { .compatible = "cdns,versal-gem", .data = RXCLK_EN },
        { .compatible = "cdns,zynqmp-gem" },
        { .compatible = "cdns,zynq-gem" },
        { .compatible = "cdns,gem" },
        { }
};

U_BOOT_DRIVER(zynq_gem) = {
        .name   = "zynq_gem",
        .id     = UCLASS_ETH,
        .of_match = zynq_gem_ids,
        .of_to_plat = zynq_gem_of_to_plat,
        .probe  = zynq_gem_probe,
        .remove = zynq_gem_remove,
        .ops    = &zynq_gem_ops,
        .priv_auto      = sizeof(struct zynq_gem_priv),
        .plat_auto      = sizeof(struct eth_pdata),
};