/*
 * Copyright 2014 Broadcom Corporation.
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

#ifdef BCM_GMAC_DEBUG
#ifndef DEBUG
#define DEBUG
#endif
#endif

#include <config.h>
#include <common.h>
#include <malloc.h>
#include <net.h>
#include <asm/io.h>
#include <phy.h>

#include "bcm-sf2-eth.h"
#include "bcm-sf2-eth-gmac.h"

#define SPINWAIT(exp, us) { \
        uint countdown = (us) + 9; \
        while ((exp) && (countdown >= 10)) {\
                udelay(10); \
                countdown -= 10; \
        } \
}

static int gmac_disable_dma(struct eth_dma *dma, int dir);
static int gmac_enable_dma(struct eth_dma *dma, int dir);

/* DMA Descriptor */
typedef struct {
        /* misc control bits */
        uint32_t        ctrl1;
        /* buffer count and address extension */
        uint32_t        ctrl2;
        /* memory address of the date buffer, bits 31:0 */
        uint32_t        addrlow;
        /* memory address of the date buffer, bits 63:32 */
        uint32_t        addrhigh;
} dma64dd_t;

uint32_t g_dmactrlflags;

static uint32_t dma_ctrlflags(uint32_t mask, uint32_t flags)
{
        debug("%s enter\n", __func__);

        g_dmactrlflags &= ~mask;
        g_dmactrlflags |= flags;

        /* If trying to enable parity, check if parity is actually supported */
        if (g_dmactrlflags & DMA_CTRL_PEN) {
                uint32_t control;

                control = readl(GMAC0_DMA_TX_CTRL_ADDR);
                writel(control | D64_XC_PD, GMAC0_DMA_TX_CTRL_ADDR);
                if (readl(GMAC0_DMA_TX_CTRL_ADDR) & D64_XC_PD) {
                        /*
                         * We *can* disable it, therefore it is supported;
                         * restore control register
                         */
                        writel(control, GMAC0_DMA_TX_CTRL_ADDR);
                } else {
                        /* Not supported, don't allow it to be enabled */
                        g_dmactrlflags &= ~DMA_CTRL_PEN;
                }
        }

        return g_dmactrlflags;
}

static inline void reg32_clear_bits(uint32_t reg, uint32_t value)
{
        uint32_t v = readl(reg);
        v &= ~(value);
        writel(v, reg);
}

static inline void reg32_set_bits(uint32_t reg, uint32_t value)
{
        uint32_t v = readl(reg);
        v |= value;
        writel(v, reg);
}

#ifdef BCM_GMAC_DEBUG
static void dma_tx_dump(struct eth_dma *dma)
{
        dma64dd_t *descp = NULL;
        uint8_t *bufp;
        int i;

        printf("TX DMA Register:\n");
        printf("control:0x%x; ptr:0x%x; addrl:0x%x; addrh:0x%x; stat0:0x%x, stat1:0x%x\n",
               readl(GMAC0_DMA_TX_CTRL_ADDR),
               readl(GMAC0_DMA_TX_PTR_ADDR),
               readl(GMAC0_DMA_TX_ADDR_LOW_ADDR),
               readl(GMAC0_DMA_TX_ADDR_HIGH_ADDR),
               readl(GMAC0_DMA_TX_STATUS0_ADDR),
               readl(GMAC0_DMA_TX_STATUS1_ADDR));

        printf("TX Descriptors:\n");
        for (i = 0; i < TX_BUF_NUM; i++) {
                descp = (dma64dd_t *)(dma->tx_desc_aligned) + i;
                printf("ctrl1:0x%08x; ctrl2:0x%08x; addr:0x%x 0x%08x\n",
                       descp->ctrl1, descp->ctrl2,
                       descp->addrhigh, descp->addrlow);
        }

        printf("TX Buffers:\n");
        /* Initialize TX DMA descriptor table */
        for (i = 0; i < TX_BUF_NUM; i++) {
                bufp = (uint8_t *)(dma->tx_buf + i * TX_BUF_SIZE);
                printf("buf%d:0x%x; ", i, (uint32_t)bufp);
        }
        printf("\n");
}

static void dma_rx_dump(struct eth_dma *dma)
{
        dma64dd_t *descp = NULL;
        uint8_t *bufp;
        int i;

        printf("RX DMA Register:\n");
        printf("control:0x%x; ptr:0x%x; addrl:0x%x; addrh:0x%x; stat0:0x%x, stat1:0x%x\n",
               readl(GMAC0_DMA_RX_CTRL_ADDR),
               readl(GMAC0_DMA_RX_PTR_ADDR),
               readl(GMAC0_DMA_RX_ADDR_LOW_ADDR),
               readl(GMAC0_DMA_RX_ADDR_HIGH_ADDR),
               readl(GMAC0_DMA_RX_STATUS0_ADDR),
               readl(GMAC0_DMA_RX_STATUS1_ADDR));

        printf("RX Descriptors:\n");
        for (i = 0; i < RX_BUF_NUM; i++) {
                descp = (dma64dd_t *)(dma->rx_desc_aligned) + i;
                printf("ctrl1:0x%08x; ctrl2:0x%08x; addr:0x%x 0x%08x\n",
                       descp->ctrl1, descp->ctrl2,
                       descp->addrhigh, descp->addrlow);
        }

        printf("RX Buffers:\n");
        for (i = 0; i < RX_BUF_NUM; i++) {
                bufp = dma->rx_buf + i * RX_BUF_SIZE;
                printf("buf%d:0x%x; ", i, (uint32_t)bufp);
        }
        printf("\n");
}
#endif

static int dma_tx_init(struct eth_dma *dma)
{
        dma64dd_t *descp = NULL;
        uint8_t *bufp;
        int i;
        uint32_t ctrl;

        debug("%s enter\n", __func__);

        /* clear descriptor memory */
        memset((void *)(dma->tx_desc_aligned), 0,
               TX_BUF_NUM * sizeof(dma64dd_t));
        memset(dma->tx_buf, 0, TX_BUF_NUM * TX_BUF_SIZE);

        /* Initialize TX DMA descriptor table */
        for (i = 0; i < TX_BUF_NUM; i++) {
                descp = (dma64dd_t *)(dma->tx_desc_aligned) + i;
                bufp = dma->tx_buf + i * TX_BUF_SIZE;
                /* clear buffer memory */
                memset((void *)bufp, 0, TX_BUF_SIZE);

                ctrl = 0;
                /* if last descr set endOfTable */
                if (i == (TX_BUF_NUM-1))
                        ctrl = D64_CTRL1_EOT;
                descp->ctrl1 = ctrl;
                descp->ctrl2 = 0;
                descp->addrlow = (uint32_t)bufp;
                descp->addrhigh = 0;
        }

        /* flush descriptor and buffer */
        descp = dma->tx_desc_aligned;
        bufp = dma->tx_buf;
        flush_dcache_range((unsigned long)descp,
                           (unsigned long)(descp +
                                           sizeof(dma64dd_t) * TX_BUF_NUM));
        flush_dcache_range((unsigned long)(bufp),
                           (unsigned long)(bufp + TX_BUF_SIZE * TX_BUF_NUM));

        /* initialize the DMA channel */
        writel((uint32_t)(dma->tx_desc_aligned), GMAC0_DMA_TX_ADDR_LOW_ADDR);
        writel(0, GMAC0_DMA_TX_ADDR_HIGH_ADDR);

        /* now update the dma last descriptor */
        writel(((uint32_t)(dma->tx_desc_aligned)) & D64_XP_LD_MASK,
               GMAC0_DMA_TX_PTR_ADDR);

        return 0;
}

static int dma_rx_init(struct eth_dma *dma)
{
        uint32_t last_desc;
        dma64dd_t *descp = NULL;
        uint8_t *bufp;
        uint32_t ctrl;
        int i;

        debug("%s enter\n", __func__);

        /* clear descriptor memory */
        memset((void *)(dma->rx_desc_aligned), 0,
               RX_BUF_NUM * sizeof(dma64dd_t));
        /* clear buffer memory */
        memset(dma->rx_buf, 0, RX_BUF_NUM * RX_BUF_SIZE);

        /* Initialize RX DMA descriptor table */
        for (i = 0; i < RX_BUF_NUM; i++) {
                descp = (dma64dd_t *)(dma->rx_desc_aligned) + i;
                bufp = dma->rx_buf + i * RX_BUF_SIZE;
                ctrl = 0;
                /* if last descr set endOfTable */
                if (i == (RX_BUF_NUM - 1))
                        ctrl = D64_CTRL1_EOT;
                descp->ctrl1 = ctrl;
                descp->ctrl2 = RX_BUF_SIZE;
                descp->addrlow = (uint32_t)bufp;
                descp->addrhigh = 0;

                last_desc = ((uint32_t)(descp) & D64_XP_LD_MASK)
                                + sizeof(dma64dd_t);
        }

        descp = dma->rx_desc_aligned;
        bufp = dma->rx_buf;
        /* flush descriptor and buffer */
        flush_dcache_range((unsigned long)descp,
                           (unsigned long)(descp +
                                           sizeof(dma64dd_t) * RX_BUF_NUM));
        flush_dcache_range((unsigned long)(bufp),
                           (unsigned long)(bufp + RX_BUF_SIZE * RX_BUF_NUM));

        /* initailize the DMA channel */
        writel((uint32_t)descp, GMAC0_DMA_RX_ADDR_LOW_ADDR);
        writel(0, GMAC0_DMA_RX_ADDR_HIGH_ADDR);

        /* now update the dma last descriptor */
        writel(last_desc, GMAC0_DMA_RX_PTR_ADDR);

        return 0;
}

static int dma_init(struct eth_dma *dma)
{
        debug(" %s enter\n", __func__);

        /*
         * Default flags: For backwards compatibility both
         * Rx Overflow Continue and Parity are DISABLED.
         */
        dma_ctrlflags(DMA_CTRL_ROC | DMA_CTRL_PEN, 0);

        debug("rx burst len 0x%x\n",
              (readl(GMAC0_DMA_RX_CTRL_ADDR) & D64_RC_BL_MASK)
              >> D64_RC_BL_SHIFT);
        debug("tx burst len 0x%x\n",
              (readl(GMAC0_DMA_TX_CTRL_ADDR) & D64_XC_BL_MASK)
              >> D64_XC_BL_SHIFT);

        dma_tx_init(dma);
        dma_rx_init(dma);

        /* From end of chip_init() */
        /* enable the overflow continue feature and disable parity */
        dma_ctrlflags(DMA_CTRL_ROC | DMA_CTRL_PEN /* mask */,
                      DMA_CTRL_ROC /* value */);

        return 0;
}

static int dma_deinit(struct eth_dma *dma)
{
        debug(" %s enter\n", __func__);

        gmac_disable_dma(dma, MAC_DMA_RX);
        gmac_disable_dma(dma, MAC_DMA_TX);

        free(dma->tx_buf);
        dma->tx_buf = NULL;
        free(dma->tx_desc);
        dma->tx_desc = NULL;
        dma->tx_desc_aligned = NULL;

        free(dma->rx_buf);
        dma->rx_buf = NULL;
        free(dma->rx_desc);
        dma->rx_desc = NULL;
        dma->rx_desc_aligned = NULL;

        return 0;
}

int gmac_tx_packet(struct eth_dma *dma, void *packet, int length)
{
        uint8_t *bufp = dma->tx_buf + dma->cur_tx_index * TX_BUF_SIZE;

        /* kick off the dma */
        size_t len = length;
        int txout = dma->cur_tx_index;
        uint32_t flags;
        dma64dd_t *descp = NULL;
        uint32_t ctrl;
        uint32_t last_desc = (((uint32_t)dma->tx_desc_aligned) +
                              sizeof(dma64dd_t)) & D64_XP_LD_MASK;
        size_t buflen;

        debug("%s enter\n", __func__);

        /* load the buffer */
        memcpy(bufp, packet, len);

        /* Add 4 bytes for Ethernet FCS/CRC */
        buflen = len + 4;

        ctrl = (buflen & D64_CTRL2_BC_MASK);

        /* the transmit will only be one frame or set SOF, EOF */
        /* also set int on completion */
        flags = D64_CTRL1_SOF | D64_CTRL1_IOC | D64_CTRL1_EOF;

        /* txout points to the descriptor to uset */
        /* if last descriptor then set EOT */
        if (txout == (TX_BUF_NUM - 1)) {
                flags |= D64_CTRL1_EOT;
                last_desc = ((uint32_t)(dma->tx_desc_aligned)) & D64_XP_LD_MASK;
        }

        /* write the descriptor */
        descp = ((dma64dd_t *)(dma->tx_desc_aligned)) + txout;
        descp->addrlow = (uint32_t)bufp;
        descp->addrhigh = 0;
        descp->ctrl1 = flags;
        descp->ctrl2 = ctrl;

        /* flush descriptor and buffer */
        flush_dcache_range((unsigned long)descp,
                           (unsigned long)(descp + sizeof(dma64dd_t)));
        flush_dcache_range((unsigned long)bufp,
                           (unsigned long)(bufp + TX_BUF_SIZE));

        /* now update the dma last descriptor */
        writel(last_desc, GMAC0_DMA_TX_PTR_ADDR);

        /* tx dma should be enabled so packet should go out */

        /* update txout */
        dma->cur_tx_index = (txout + 1) & (TX_BUF_NUM - 1);

        return 0;
}

bool gmac_check_tx_done(struct eth_dma *dma)
{
        /* wait for tx to complete */
        uint32_t intstatus;
        bool xfrdone = false;

        debug("%s enter\n", __func__);

        intstatus = readl(GMAC0_INT_STATUS_ADDR);

        debug("int(0x%x)\n", intstatus);
        if (intstatus & (I_XI0 | I_XI1 | I_XI2 | I_XI3)) {
                xfrdone = true;
                /* clear the int bits */
                intstatus &= ~(I_XI0 | I_XI1 | I_XI2 | I_XI3);
                writel(intstatus, GMAC0_INT_STATUS_ADDR);
        } else {
                debug("Tx int(0x%x)\n", intstatus);
        }

        return xfrdone;
}

int gmac_check_rx_done(struct eth_dma *dma, uint8_t *buf)
{
        void *bufp, *datap;
        size_t rcvlen = 0, buflen = 0;
        uint32_t stat0 = 0, stat1 = 0;
        uint32_t control, offset;
        uint8_t statbuf[HWRXOFF*2];

        int index, curr, active;
        dma64dd_t *descp = NULL;

        /* udelay(50); */

        /*
         * this api will check if a packet has been received.
         * If so it will return the address of the buffer and current
         * descriptor index will be incremented to the
         * next descriptor. Once done with the frame the buffer should be
         * added back onto the descriptor and the lastdscr should be updated
         * to this descriptor.
         */
        index = dma->cur_rx_index;
        offset = (uint32_t)(dma->rx_desc_aligned);
        stat0 = readl(GMAC0_DMA_RX_STATUS0_ADDR) & D64_RS0_CD_MASK;
        stat1 = readl(GMAC0_DMA_RX_STATUS1_ADDR) & D64_RS0_CD_MASK;
        curr = ((stat0 - offset) & D64_RS0_CD_MASK) / sizeof(dma64dd_t);
        active = ((stat1 - offset) & D64_RS0_CD_MASK) / sizeof(dma64dd_t);

        /* check if any frame */
        if (index == curr)
                return -1;

        debug("received packet\n");
        debug("expect(0x%x) curr(0x%x) active(0x%x)\n", index, curr, active);
        /* remove warning */
        if (index == active)
                ;

        /* get the packet pointer that corresponds to the rx descriptor */
        bufp = dma->rx_buf + index * RX_BUF_SIZE;

        descp = (dma64dd_t *)(dma->rx_desc_aligned) + index;
        /* flush descriptor and buffer */
        flush_dcache_range((unsigned long)descp,
                           (unsigned long)(descp + sizeof(dma64dd_t)));
        flush_dcache_range((unsigned long)bufp,
                           (unsigned long)(bufp + RX_BUF_SIZE));

        buflen = (descp->ctrl2 & D64_CTRL2_BC_MASK);

        stat0 = readl(GMAC0_DMA_RX_STATUS0_ADDR);
        stat1 = readl(GMAC0_DMA_RX_STATUS1_ADDR);

        debug("bufp(0x%x) index(0x%x) buflen(0x%x) stat0(0x%x) stat1(0x%x)\n",
              (uint32_t)bufp, index, buflen, stat0, stat1);

        dma->cur_rx_index = (index + 1) & (RX_BUF_NUM - 1);

        /* get buffer offset */
        control = readl(GMAC0_DMA_RX_CTRL_ADDR);
        offset = (control & D64_RC_RO_MASK) >> D64_RC_RO_SHIFT;
        rcvlen = *(uint16_t *)bufp;

        debug("Received %d bytes\n", rcvlen);
        /* copy status into temp buf then copy data from rx buffer */
        memcpy(statbuf, bufp, offset);
        datap = (void *)((uint32_t)bufp + offset);
        memcpy(buf, datap, rcvlen);

        /* update descriptor that is being added back on ring */
        descp->ctrl2 = RX_BUF_SIZE;
        descp->addrlow = (uint32_t)bufp;
        descp->addrhigh = 0;
        /* flush descriptor */
        flush_dcache_range((unsigned long)descp,
                           (unsigned long)(descp + sizeof(dma64dd_t)));

        /* set the lastdscr for the rx ring */
        writel(((uint32_t)descp) & D64_XP_LD_MASK, GMAC0_DMA_RX_PTR_ADDR);

        return (int)rcvlen;
}

static int gmac_disable_dma(struct eth_dma *dma, int dir)
{
        int status;

        debug("%s enter\n", __func__);

        if (dir == MAC_DMA_TX) {
                /* address PR8249/PR7577 issue */
                /* suspend tx DMA first */
                writel(D64_XC_SE, GMAC0_DMA_TX_CTRL_ADDR);
                SPINWAIT(((status = (readl(GMAC0_DMA_TX_STATUS0_ADDR) &
                                     D64_XS0_XS_MASK)) !=
                          D64_XS0_XS_DISABLED) &&
                         (status != D64_XS0_XS_IDLE) &&
                         (status != D64_XS0_XS_STOPPED), 10000);

                /*
                 * PR2414 WAR: DMA engines are not disabled until
                 * transfer finishes
                 */
                writel(0, GMAC0_DMA_TX_CTRL_ADDR);
                SPINWAIT(((status = (readl(GMAC0_DMA_TX_STATUS0_ADDR) &
                                     D64_XS0_XS_MASK)) !=
                          D64_XS0_XS_DISABLED), 10000);

                /* wait for the last transaction to complete */
                udelay(2);

                status = (status == D64_XS0_XS_DISABLED);
        } else {
                /*
                 * PR2414 WAR: DMA engines are not disabled until
                 * transfer finishes
                 */
                writel(0, GMAC0_DMA_RX_CTRL_ADDR);
                SPINWAIT(((status = (readl(GMAC0_DMA_RX_STATUS0_ADDR) &
                                     D64_RS0_RS_MASK)) !=
                          D64_RS0_RS_DISABLED), 10000);

                status = (status == D64_RS0_RS_DISABLED);
        }

        return status;
}

static int gmac_enable_dma(struct eth_dma *dma, int dir)
{
        uint32_t control;

        debug("%s enter\n", __func__);

        if (dir == MAC_DMA_TX) {
                dma->cur_tx_index = 0;

                /*
                 * These bits 20:18 (burstLen) of control register can be
                 * written but will take effect only if these bits are
                 * valid. So this will not affect previous versions
                 * of the DMA. They will continue to have those bits set to 0.
                 */
                control = readl(GMAC0_DMA_TX_CTRL_ADDR);

                control |= D64_XC_XE;
                if ((g_dmactrlflags & DMA_CTRL_PEN) == 0)
                        control |= D64_XC_PD;

                writel(control, GMAC0_DMA_TX_CTRL_ADDR);

                /* initailize the DMA channel */
                writel((uint32_t)(dma->tx_desc_aligned),
                       GMAC0_DMA_TX_ADDR_LOW_ADDR);
                writel(0, GMAC0_DMA_TX_ADDR_HIGH_ADDR);
        } else {
                dma->cur_rx_index = 0;

                control = (readl(GMAC0_DMA_RX_CTRL_ADDR) &
                           D64_RC_AE) | D64_RC_RE;

                if ((g_dmactrlflags & DMA_CTRL_PEN) == 0)
                        control |= D64_RC_PD;

                if (g_dmactrlflags & DMA_CTRL_ROC)
                        control |= D64_RC_OC;

                /*
                 * These bits 20:18 (burstLen) of control register can be
                 * written but will take effect only if these bits are
                 * valid. So this will not affect previous versions
                 * of the DMA. They will continue to have those bits set to 0.
                 */
                control &= ~D64_RC_BL_MASK;
                /* Keep default Rx burstlen */
                control |= readl(GMAC0_DMA_RX_CTRL_ADDR) & D64_RC_BL_MASK;
                control |= HWRXOFF << D64_RC_RO_SHIFT;

                writel(control, GMAC0_DMA_RX_CTRL_ADDR);

                /*
                 * the rx descriptor ring should have
                 * the addresses set properly;
                 * set the lastdscr for the rx ring
                 */
                writel(((uint32_t)(dma->rx_desc_aligned) +
                        (RX_BUF_NUM - 1) * RX_BUF_SIZE) &
                       D64_XP_LD_MASK, GMAC0_DMA_RX_PTR_ADDR);
        }

        return 0;
}

bool gmac_mii_busywait(unsigned int timeout)
{
        uint32_t tmp = 0;

        while (timeout > 10) {
                tmp = readl(GMAC_MII_CTRL_ADDR);
                if (tmp & (1 << GMAC_MII_BUSY_SHIFT)) {
                        udelay(10);
                        timeout -= 10;
                } else {
                        break;
                }
        }
        return tmp & (1 << GMAC_MII_BUSY_SHIFT);
}

int gmac_miiphy_read(struct mii_dev *bus, int phyaddr, int devad, int reg)
{
        uint32_t tmp = 0;
        u16 value = 0;

        /* Busy wait timeout is 1ms */
        if (gmac_mii_busywait(1000)) {
                error("%s: Prepare MII read: MII/MDIO busy\n", __func__);
                return -1;
        }

        /* Read operation */
        tmp = GMAC_MII_DATA_READ_CMD;
        tmp |= (phyaddr << GMAC_MII_PHY_ADDR_SHIFT) |
                (reg << GMAC_MII_PHY_REG_SHIFT);
        debug("MII read cmd 0x%x, phy 0x%x, reg 0x%x\n", tmp, phyaddr, reg);
        writel(tmp, GMAC_MII_DATA_ADDR);

        if (gmac_mii_busywait(1000)) {
                error("%s: MII read failure: MII/MDIO busy\n", __func__);
                return -1;
        }

        value = readl(GMAC_MII_DATA_ADDR) & 0xffff;
        debug("MII read data 0x%x\n", value);
        return value;
}

int gmac_miiphy_write(struct mii_dev *bus, int phyaddr, int devad, int reg,
                      u16 value)
{
        uint32_t tmp = 0;

        /* Busy wait timeout is 1ms */
        if (gmac_mii_busywait(1000)) {
                error("%s: Prepare MII write: MII/MDIO busy\n", __func__);
                return -1;
        }

        /* Write operation */
        tmp = GMAC_MII_DATA_WRITE_CMD | (value & 0xffff);
        tmp |= ((phyaddr << GMAC_MII_PHY_ADDR_SHIFT) |
                (reg << GMAC_MII_PHY_REG_SHIFT));
        debug("MII write cmd 0x%x, phy 0x%x, reg 0x%x, data 0x%x\n",
              tmp, phyaddr, reg, value);
        writel(tmp, GMAC_MII_DATA_ADDR);

        if (gmac_mii_busywait(1000)) {
                error("%s: MII write failure: MII/MDIO busy\n", __func__);
                return -1;
        }

        return 0;
}

void gmac_init_reset(void)
{
        debug("%s enter\n", __func__);

        /* set command config reg CC_SR */
        reg32_set_bits(UNIMAC0_CMD_CFG_ADDR, CC_SR);
        udelay(GMAC_RESET_DELAY);
}

void gmac_clear_reset(void)
{
        debug("%s enter\n", __func__);

        /* clear command config reg CC_SR */
        reg32_clear_bits(UNIMAC0_CMD_CFG_ADDR, CC_SR);
        udelay(GMAC_RESET_DELAY);
}

static void gmac_enable_local(bool en)
{
        uint32_t cmdcfg;

        debug("%s enter\n", __func__);

        /* read command config reg */
        cmdcfg = readl(UNIMAC0_CMD_CFG_ADDR);

        /* put mac in reset */
        gmac_init_reset();

        cmdcfg |= CC_SR;

        /* first deassert rx_ena and tx_ena while in reset */
        cmdcfg &= ~(CC_RE | CC_TE);
        /* write command config reg */
        writel(cmdcfg, UNIMAC0_CMD_CFG_ADDR);

        /* bring mac out of reset */
        gmac_clear_reset();

        /* if not enable exit now */
        if (!en)
                return;

        /* enable the mac transmit and receive paths now */
        udelay(2);
        cmdcfg &= ~CC_SR;
        cmdcfg |= (CC_RE | CC_TE);

        /* assert rx_ena and tx_ena when out of reset to enable the mac */
        writel(cmdcfg, UNIMAC0_CMD_CFG_ADDR);

        return;
}

int gmac_enable(void)
{
        gmac_enable_local(1);

        /* clear interrupts */
        writel(I_INTMASK, GMAC0_INT_STATUS_ADDR);
        return 0;
}

int gmac_disable(void)
{
        gmac_enable_local(0);
        return 0;
}

int gmac_set_speed(int speed, int duplex)
{
        uint32_t cmdcfg;
        uint32_t hd_ena;
        uint32_t speed_cfg;

        hd_ena = duplex ? 0 : CC_HD;
        if (speed == 1000) {
                speed_cfg = 2;
        } else if (speed == 100) {
                speed_cfg = 1;
        } else if (speed == 10) {
                speed_cfg = 0;
        } else {
                error("%s: Invalid GMAC speed(%d)!\n", __func__, speed);
                return -1;
        }

        cmdcfg = readl(UNIMAC0_CMD_CFG_ADDR);
        cmdcfg &= ~(CC_ES_MASK | CC_HD);
        cmdcfg |= ((speed_cfg << CC_ES_SHIFT) | hd_ena);

        printf("Change GMAC speed to %dMB\n", speed);
        debug("GMAC speed cfg 0x%x\n", cmdcfg);
        writel(cmdcfg, UNIMAC0_CMD_CFG_ADDR);

        return 0;
}

int gmac_set_mac_addr(unsigned char *mac)
{
        /* set our local address */
        debug("GMAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
              mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
        writel(htonl(*(uint32_t *)mac), UNIMAC0_MAC_MSB_ADDR);
        writew(htons(*(uint32_t *)&mac[4]), UNIMAC0_MAC_LSB_ADDR);

        return 0;
}

int gmac_mac_init(struct eth_device *dev)
{
        struct eth_info *eth = (struct eth_info *)(dev->priv);
        struct eth_dma *dma = &(eth->dma);

        uint32_t tmp;
        uint32_t cmdcfg;
        int chipid;

        debug("%s enter\n", __func__);

        /* Always use GMAC0 */
        printf("Using GMAC%d\n", 0);

        /* Reset AMAC0 core */
        writel(0, AMAC0_IDM_RESET_ADDR);
        tmp = readl(AMAC0_IO_CTRL_DIRECT_ADDR);
        /* Set clock */
        tmp &= ~(1 << AMAC0_IO_CTRL_CLK_250_SEL_SHIFT);
        tmp |= (1 << AMAC0_IO_CTRL_GMII_MODE_SHIFT);
        /* Set Tx clock */
        tmp &= ~(1 << AMAC0_IO_CTRL_DEST_SYNC_MODE_EN_SHIFT);
        writel(tmp, AMAC0_IO_CTRL_DIRECT_ADDR);

        /* reset gmac */
        /*
         * As AMAC is just reset, NO need?
         * set eth_data into loopback mode to ensure no rx traffic
         * gmac_loopback(eth_data, TRUE);
         * ET_TRACE(("%s gmac loopback\n", __func__));
         * udelay(1);
         */

        cmdcfg = readl(UNIMAC0_CMD_CFG_ADDR);
        cmdcfg &= ~(CC_TE | CC_RE | CC_RPI | CC_TAI | CC_HD | CC_ML |
                    CC_CFE | CC_RL | CC_RED | CC_PE | CC_TPI |
                    CC_PAD_EN | CC_PF);
        cmdcfg |= (CC_PROM | CC_NLC | CC_CFE);
        /* put mac in reset */
        gmac_init_reset();
        writel(cmdcfg, UNIMAC0_CMD_CFG_ADDR);
        gmac_clear_reset();

        /* enable clear MIB on read */
        reg32_set_bits(GMAC0_DEV_CTRL_ADDR, DC_MROR);
        /* PHY: set smi_master to drive mdc_clk */
        reg32_set_bits(GMAC0_PHY_CTRL_ADDR, PC_MTE);

        /* clear persistent sw intstatus */
        writel(0, GMAC0_INT_STATUS_ADDR);

        if (dma_init(dma) < 0) {
                error("%s: GMAC dma_init failed\n", __func__);
                goto err_exit;
        }

        chipid = CHIPID;
        printf("%s: Chip ID: 0x%x\n", __func__, chipid);

        /* set switch bypass mode */
        tmp = readl(SWITCH_GLOBAL_CONFIG_ADDR);
        tmp |= (1 << CDRU_SWITCH_BYPASS_SWITCH_SHIFT);

        /* Switch mode */
        /* tmp &= ~(1 << CDRU_SWITCH_BYPASS_SWITCH_SHIFT); */

        writel(tmp, SWITCH_GLOBAL_CONFIG_ADDR);

        tmp = readl(CRMU_CHIP_IO_PAD_CONTROL_ADDR);
        tmp &= ~(1 << CDRU_IOMUX_FORCE_PAD_IN_SHIFT);
        writel(tmp, CRMU_CHIP_IO_PAD_CONTROL_ADDR);

        /* Set MDIO to internal GPHY */
        tmp = readl(GMAC_MII_CTRL_ADDR);
        /* Select internal MDC/MDIO bus*/
        tmp &= ~(1 << GMAC_MII_CTRL_BYP_SHIFT);
        /* select MDC/MDIO connecting to on-chip internal PHYs */
        tmp &= ~(1 << GMAC_MII_CTRL_EXT_SHIFT);
        /*
         * give bit[6:0](MDCDIV) with required divisor to set
         * the MDC clock frequency, 66MHZ/0x1A=2.5MHZ
         */
        tmp |= 0x1A;

        writel(tmp, GMAC_MII_CTRL_ADDR);

        if (gmac_mii_busywait(1000)) {
                error("%s: Configure MDIO: MII/MDIO busy\n", __func__);
                goto err_exit;
        }

        /* Configure GMAC0 */
        /* enable one rx interrupt per received frame */
        writel(1 << GMAC0_IRL_FRAMECOUNT_SHIFT, GMAC0_INTR_RECV_LAZY_ADDR);

        /* read command config reg */
        cmdcfg = readl(UNIMAC0_CMD_CFG_ADDR);
        /* enable 802.3x tx flow control (honor received PAUSE frames) */
        cmdcfg &= ~CC_RPI;
        /* enable promiscuous mode */
        cmdcfg |= CC_PROM;
        /* Disable loopback mode */
        cmdcfg &= ~CC_ML;
        /* set the speed */
        cmdcfg &= ~(CC_ES_MASK | CC_HD);
        /* Set to 1Gbps and full duplex by default */
        cmdcfg |= (2 << CC_ES_SHIFT);

        /* put mac in reset */
        gmac_init_reset();
        /* write register */
        writel(cmdcfg, UNIMAC0_CMD_CFG_ADDR);
        /* bring mac out of reset */
        gmac_clear_reset();

        /* set max frame lengths; account for possible vlan tag */
        writel(PKTSIZE + 32, UNIMAC0_FRM_LENGTH_ADDR);

        return 0;

err_exit:
        dma_deinit(dma);
        return -1;
}

int gmac_add(struct eth_device *dev)
{
        struct eth_info *eth = (struct eth_info *)(dev->priv);
        struct eth_dma *dma = &(eth->dma);
        void *tmp;

        /*
         * Desc has to be 16-byte aligned ?
         * If it is 8-byte aligned by malloc, fail Tx
         */
        tmp = malloc(sizeof(dma64dd_t) * TX_BUF_NUM + 8);
        if (tmp == NULL) {
                printf("%s: Failed to allocate TX desc Buffer\n", __func__);
                return -1;
        }

        dma->tx_desc = (void *)tmp;
        dma->tx_desc_aligned = (void *)(((uint32_t)tmp) & (~0xf));
        debug("TX Descriptor Buffer: %p; length: 0x%x\n",
              dma->tx_desc_aligned, sizeof(dma64dd_t) * TX_BUF_NUM);

        tmp = malloc(TX_BUF_SIZE * TX_BUF_NUM);
        if (tmp == NULL) {
                printf("%s: Failed to allocate TX Data Buffer\n", __func__);
                free(dma->tx_desc);
                return -1;
        }
        dma->tx_buf = (uint8_t *)tmp;
        debug("TX Data Buffer: %p; length: 0x%x\n",
              dma->tx_buf, TX_BUF_SIZE * TX_BUF_NUM);

        /* Desc has to be 16-byte aligned ? */
        tmp = malloc(sizeof(dma64dd_t) * RX_BUF_NUM + 8);
        if (tmp == NULL) {
                printf("%s: Failed to allocate RX Descriptor\n", __func__);
                free(dma->tx_desc);
                free(dma->tx_buf);
                return -1;
        }
        dma->rx_desc = tmp;
        dma->rx_desc_aligned = (void *)(((uint32_t)tmp) & (~0xf));
        debug("RX Descriptor Buffer: %p, length: 0x%x\n",
              dma->rx_desc_aligned, sizeof(dma64dd_t) * RX_BUF_NUM);

        tmp = malloc(RX_BUF_SIZE * RX_BUF_NUM);
        if (tmp == NULL) {
                printf("%s: Failed to allocate RX Data Buffer\n", __func__);
                free(dma->tx_desc);
                free(dma->tx_buf);
                free(dma->rx_desc);
                return -1;
        }
        dma->rx_buf = tmp;
        debug("RX Data Buffer: %p; length: 0x%x\n",
              dma->rx_buf, RX_BUF_SIZE * RX_BUF_NUM);

        g_dmactrlflags = 0;

        eth->phy_interface = PHY_INTERFACE_MODE_GMII;

        dma->tx_packet = gmac_tx_packet;
        dma->check_tx_done = gmac_check_tx_done;

        dma->check_rx_done = gmac_check_rx_done;

        dma->enable_dma = gmac_enable_dma;
        dma->disable_dma = gmac_disable_dma;

        eth->miiphy_read = gmac_miiphy_read;
        eth->miiphy_write = gmac_miiphy_write;

        eth->mac_init = gmac_mac_init;
        eth->disable_mac = gmac_disable;
        eth->enable_mac = gmac_enable;
        eth->set_mac_addr = gmac_set_mac_addr;
        eth->set_mac_speed = gmac_set_speed;

        return 0;
}