/*
 * rtl8169.c : U-Boot driver for the RealTek RTL8169
 *
 * Masami Komiya (mkomiya@sonare.it)
 *
 * Most part is taken from r8169.c of etherboot
 *
 */

/**************************************************************************
*    r8169.c: Etherboot device driver for the RealTek RTL-8169 Gigabit
*    Written 2003 by Timothy Legge <tlegge@rogers.com>
*
 * SPDX-License-Identifier:     GPL-2.0+
*
*    Portions of this code based on:
*       r8169.c: A RealTek RTL-8169 Gigabit Ethernet driver
*               for Linux kernel 2.4.x.
*
*    Written 2002 ShuChen <shuchen@realtek.com.tw>
*         See Linux Driver for full information
*
*    Linux Driver Version 1.27a, 10.02.2002
*
*    Thanks to:
*       Jean Chen of RealTek Semiconductor Corp. for
*       providing the evaluation NIC used to develop
*       this driver.  RealTek's support for Etherboot
*       is appreciated.
*
*    REVISION HISTORY:
*    ================
*
*    v1.0       11-26-2003      timlegge        Initial port of Linux driver
*    v1.5       01-17-2004      timlegge        Initial driver output cleanup
*
*    Indent Options: indent -kr -i8
***************************************************************************/
/*
 * 26 August 2006 Mihai Georgian <u-boot@linuxnotincluded.org.uk>
 * Modified to use le32_to_cpu and cpu_to_le32 properly
 */
#include <common.h>
#include <errno.h>
#include <malloc.h>
#include <net.h>
#include <netdev.h>
#include <asm/io.h>
#include <pci.h>

#undef DEBUG_RTL8169
#undef DEBUG_RTL8169_TX
#undef DEBUG_RTL8169_RX

#define drv_version "v1.5"
#define drv_date "01-17-2004"

static unsigned long ioaddr;

/* Condensed operations for readability. */
#define currticks()     get_timer(0)

/* media options */
#define MAX_UNITS 8
static int media[MAX_UNITS] = { -1, -1, -1, -1, -1, -1, -1, -1 };

/* MAC address length*/
#define MAC_ADDR_LEN    6

/* max supported gigabit ethernet frame size -- must be at least (dev->mtu+14+4).*/
#define MAX_ETH_FRAME_SIZE      1536

#define TX_FIFO_THRESH 256      /* In bytes */

#define RX_FIFO_THRESH  7       /* 7 means NO threshold, Rx buffer level before first PCI xfer.  */
#define RX_DMA_BURST    6       /* Maximum PCI burst, '6' is 1024 */
#define TX_DMA_BURST    6       /* Maximum PCI burst, '6' is 1024 */
#define EarlyTxThld     0x3F    /* 0x3F means NO early transmit */
#define RxPacketMaxSize 0x0800  /* Maximum size supported is 16K-1 */
#define InterFrameGap   0x03    /* 3 means InterFrameGap = the shortest one */

#define NUM_TX_DESC     1       /* Number of Tx descriptor registers */
#ifdef CONFIG_SYS_RX_ETH_BUFFER
  #define NUM_RX_DESC   CONFIG_SYS_RX_ETH_BUFFER
#else
  #define NUM_RX_DESC   4       /* Number of Rx descriptor registers */
#endif
#define RX_BUF_SIZE     1536    /* Rx Buffer size */
#define RX_BUF_LEN      8192

#define RTL_MIN_IO_SIZE 0x80
#define TX_TIMEOUT  (6*HZ)

/* write/read MMIO register. Notice: {read,write}[wl] do the necessary swapping */
#define RTL_W8(reg, val8)       writeb((val8), ioaddr + (reg))
#define RTL_W16(reg, val16)     writew((val16), ioaddr + (reg))
#define RTL_W32(reg, val32)     writel((val32), ioaddr + (reg))
#define RTL_R8(reg)             readb(ioaddr + (reg))
#define RTL_R16(reg)            readw(ioaddr + (reg))
#define RTL_R32(reg)            readl(ioaddr + (reg))

#define ETH_FRAME_LEN   MAX_ETH_FRAME_SIZE
#define ETH_ALEN        MAC_ADDR_LEN
#define ETH_ZLEN        60

#define bus_to_phys(a)  pci_mem_to_phys((pci_dev_t)(unsigned long)dev->priv, \
        (pci_addr_t)(unsigned long)a)
#define phys_to_bus(a)  pci_phys_to_mem((pci_dev_t)(unsigned long)dev->priv, \
        (phys_addr_t)a)

enum RTL8169_registers {
        MAC0 = 0,               /* Ethernet hardware address. */
        MAR0 = 8,               /* Multicast filter. */
        TxDescStartAddrLow = 0x20,
        TxDescStartAddrHigh = 0x24,
        TxHDescStartAddrLow = 0x28,
        TxHDescStartAddrHigh = 0x2c,
        FLASH = 0x30,
        ERSR = 0x36,
        ChipCmd = 0x37,
        TxPoll = 0x38,
        IntrMask = 0x3C,
        IntrStatus = 0x3E,
        TxConfig = 0x40,
        RxConfig = 0x44,
        RxMissed = 0x4C,
        Cfg9346 = 0x50,
        Config0 = 0x51,
        Config1 = 0x52,
        Config2 = 0x53,
        Config3 = 0x54,
        Config4 = 0x55,
        Config5 = 0x56,
        MultiIntr = 0x5C,
        PHYAR = 0x60,
        TBICSR = 0x64,
        TBI_ANAR = 0x68,
        TBI_LPAR = 0x6A,
        PHYstatus = 0x6C,
        RxMaxSize = 0xDA,
        CPlusCmd = 0xE0,
        RxDescStartAddrLow = 0xE4,
        RxDescStartAddrHigh = 0xE8,
        EarlyTxThres = 0xEC,
        FuncEvent = 0xF0,
        FuncEventMask = 0xF4,
        FuncPresetState = 0xF8,
        FuncForceEvent = 0xFC,
};

enum RTL8169_register_content {
        /*InterruptStatusBits */
        SYSErr = 0x8000,
        PCSTimeout = 0x4000,
        SWInt = 0x0100,
        TxDescUnavail = 0x80,
        RxFIFOOver = 0x40,
        RxUnderrun = 0x20,
        RxOverflow = 0x10,
        TxErr = 0x08,
        TxOK = 0x04,
        RxErr = 0x02,
        RxOK = 0x01,

        /*RxStatusDesc */
        RxRES = 0x00200000,
        RxCRC = 0x00080000,
        RxRUNT = 0x00100000,
        RxRWT = 0x00400000,

        /*ChipCmdBits */
        CmdReset = 0x10,
        CmdRxEnb = 0x08,
        CmdTxEnb = 0x04,
        RxBufEmpty = 0x01,

        /*Cfg9346Bits */
        Cfg9346_Lock = 0x00,
        Cfg9346_Unlock = 0xC0,

        /*rx_mode_bits */
        AcceptErr = 0x20,
        AcceptRunt = 0x10,
        AcceptBroadcast = 0x08,
        AcceptMulticast = 0x04,
        AcceptMyPhys = 0x02,
        AcceptAllPhys = 0x01,

        /*RxConfigBits */
        RxCfgFIFOShift = 13,
        RxCfgDMAShift = 8,

        /*TxConfigBits */
        TxInterFrameGapShift = 24,
        TxDMAShift = 8,         /* DMA burst value (0-7) is shift this many bits */

        /*rtl8169_PHYstatus */
        TBI_Enable = 0x80,
        TxFlowCtrl = 0x40,
        RxFlowCtrl = 0x20,
        _1000bpsF = 0x10,
        _100bps = 0x08,
        _10bps = 0x04,
        LinkStatus = 0x02,
        FullDup = 0x01,

        /*GIGABIT_PHY_registers */
        PHY_CTRL_REG = 0,
        PHY_STAT_REG = 1,
        PHY_AUTO_NEGO_REG = 4,
        PHY_1000_CTRL_REG = 9,

        /*GIGABIT_PHY_REG_BIT */
        PHY_Restart_Auto_Nego = 0x0200,
        PHY_Enable_Auto_Nego = 0x1000,

        /* PHY_STAT_REG = 1; */
        PHY_Auto_Nego_Comp = 0x0020,

        /* PHY_AUTO_NEGO_REG = 4; */
        PHY_Cap_10_Half = 0x0020,
        PHY_Cap_10_Full = 0x0040,
        PHY_Cap_100_Half = 0x0080,
        PHY_Cap_100_Full = 0x0100,

        /* PHY_1000_CTRL_REG = 9; */
        PHY_Cap_1000_Full = 0x0200,

        PHY_Cap_Null = 0x0,

        /*_MediaType*/
        _10_Half = 0x01,
        _10_Full = 0x02,
        _100_Half = 0x04,
        _100_Full = 0x08,
        _1000_Full = 0x10,

        /*_TBICSRBit*/
        TBILinkOK = 0x02000000,
};

static struct {
        const char *name;
        u8 version;             /* depend on RTL8169 docs */
        u32 RxConfigMask;       /* should clear the bits supported by this chip */
} rtl_chip_info[] = {
        {"RTL-8169", 0x00, 0xff7e1880,},
        {"RTL-8169", 0x04, 0xff7e1880,},
        {"RTL-8169", 0x00, 0xff7e1880,},
        {"RTL-8169s/8110s",     0x02, 0xff7e1880,},
        {"RTL-8169s/8110s",     0x04, 0xff7e1880,},
        {"RTL-8169sb/8110sb",   0x10, 0xff7e1880,},
        {"RTL-8169sc/8110sc",   0x18, 0xff7e1880,},
        {"RTL-8168b/8111sb",    0x30, 0xff7e1880,},
        {"RTL-8168b/8111sb",    0x38, 0xff7e1880,},
        {"RTL-8168d/8111d",     0x28, 0xff7e1880,},
        {"RTL-8168evl/8111evl", 0x2e, 0xff7e1880,},
        {"RTL-8168/8111g",      0x4c, 0xff7e1880,},
        {"RTL-8101e",           0x34, 0xff7e1880,},
        {"RTL-8100e",           0x32, 0xff7e1880,},
};

enum _DescStatusBit {
        OWNbit = 0x80000000,
        EORbit = 0x40000000,
        FSbit = 0x20000000,
        LSbit = 0x10000000,
};

struct TxDesc {
        u32 status;
        u32 vlan_tag;
        u32 buf_addr;
        u32 buf_Haddr;
};

struct RxDesc {
        u32 status;
        u32 vlan_tag;
        u32 buf_addr;
        u32 buf_Haddr;
};

#define RTL8169_DESC_SIZE 16

#if ARCH_DMA_MINALIGN > 256
#  define RTL8169_ALIGN ARCH_DMA_MINALIGN
#else
#  define RTL8169_ALIGN 256
#endif

/*
 * Warn if the cache-line size is larger than the descriptor size. In such
 * cases the driver will likely fail because the CPU needs to flush the cache
 * when requeuing RX buffers, therefore descriptors written by the hardware
 * may be discarded.
 *
 * This can be fixed by defining CONFIG_SYS_NONCACHED_MEMORY which will cause
 * the driver to allocate descriptors from a pool of non-cached memory.
 */
#if RTL8169_DESC_SIZE < ARCH_DMA_MINALIGN
#if !defined(CONFIG_SYS_NONCACHED_MEMORY) && !defined(CONFIG_SYS_DCACHE_OFF)
#warning cache-line size is larger than descriptor size
#endif
#endif

/*
 * Create a static buffer of size RX_BUF_SZ for each TX Descriptor. All
 * descriptors point to a part of this buffer.
 */
DEFINE_ALIGN_BUFFER(u8, txb, NUM_TX_DESC * RX_BUF_SIZE, RTL8169_ALIGN);

/*
 * Create a static buffer of size RX_BUF_SZ for each RX Descriptor. All
 * descriptors point to a part of this buffer.
 */
DEFINE_ALIGN_BUFFER(u8, rxb, NUM_RX_DESC * RX_BUF_SIZE, RTL8169_ALIGN);

struct rtl8169_private {
        void *mmio_addr;        /* memory map physical address */
        int chipset;
        unsigned long cur_rx;   /* Index into the Rx descriptor buffer of next Rx pkt. */
        unsigned long cur_tx;   /* Index into the Tx descriptor buffer of next Rx pkt. */
        unsigned long dirty_tx;
        struct TxDesc *TxDescArray;     /* Index of 256-alignment Tx Descriptor buffer */
        struct RxDesc *RxDescArray;     /* Index of 256-alignment Rx Descriptor buffer */
        unsigned char *RxBufferRings;   /* Index of Rx Buffer  */
        unsigned char *RxBufferRing[NUM_RX_DESC];       /* Index of Rx Buffer array */
        unsigned char *Tx_skbuff[NUM_TX_DESC];
} tpx;

static struct rtl8169_private *tpc;

static const u16 rtl8169_intr_mask =
    SYSErr | PCSTimeout | RxUnderrun | RxOverflow | RxFIFOOver | TxErr |
    TxOK | RxErr | RxOK;
static const unsigned int rtl8169_rx_config =
    (RX_FIFO_THRESH << RxCfgFIFOShift) | (RX_DMA_BURST << RxCfgDMAShift);

static struct pci_device_id supported[] = {
        {PCI_VENDOR_ID_REALTEK, 0x8167},
        {PCI_VENDOR_ID_REALTEK, 0x8168},
        {PCI_VENDOR_ID_REALTEK, 0x8169},
        {}
};

void mdio_write(int RegAddr, int value)
{
        int i;

        RTL_W32(PHYAR, 0x80000000 | (RegAddr & 0xFF) << 16 | value);
        udelay(1000);

        for (i = 2000; i > 0; i--) {
                /* Check if the RTL8169 has completed writing to the specified MII register */
                if (!(RTL_R32(PHYAR) & 0x80000000)) {
                        break;
                } else {
                        udelay(100);
                }
        }
}

int mdio_read(int RegAddr)
{
        int i, value = -1;

        RTL_W32(PHYAR, 0x0 | (RegAddr & 0xFF) << 16);
        udelay(1000);

        for (i = 2000; i > 0; i--) {
                /* Check if the RTL8169 has completed retrieving data from the specified MII register */
                if (RTL_R32(PHYAR) & 0x80000000) {
                        value = (int) (RTL_R32(PHYAR) & 0xFFFF);
                        break;
                } else {
                        udelay(100);
                }
        }
        return value;
}

static int rtl8169_init_board(struct eth_device *dev)
{
        int i;
        u32 tmp;

#ifdef DEBUG_RTL8169
        printf ("%s\n", __FUNCTION__);
#endif
        ioaddr = dev->iobase;

        /* Soft reset the chip. */
        RTL_W8(ChipCmd, CmdReset);

        /* Check that the chip has finished the reset. */
        for (i = 1000; i > 0; i--)
                if ((RTL_R8(ChipCmd) & CmdReset) == 0)
                        break;
                else
                        udelay(10);

        /* identify chip attached to board */
        tmp = RTL_R32(TxConfig);
        tmp = ((tmp & 0x7c000000) + ((tmp & 0x00800000) << 2)) >> 24;

        for (i = ARRAY_SIZE(rtl_chip_info) - 1; i >= 0; i--){
                if (tmp == rtl_chip_info[i].version) {
                        tpc->chipset = i;
                        goto match;
                }
        }

        /* if unknown chip, assume array element #0, original RTL-8169 in this case */
        printf("PCI device %s: unknown chip version, assuming RTL-8169\n", dev->name);
        printf("PCI device: TxConfig = 0x%lX\n", (unsigned long) RTL_R32(TxConfig));
        tpc->chipset = 0;

match:
        return 0;
}

/*
 * TX and RX descriptors are 16 bytes. This causes problems with the cache
 * maintenance on CPUs where the cache-line size exceeds the size of these
 * descriptors. What will happen is that when the driver receives a packet
 * it will be immediately requeued for the hardware to reuse. The CPU will
 * therefore need to flush the cache-line containing the descriptor, which
 * will cause all other descriptors in the same cache-line to be flushed
 * along with it. If one of those descriptors had been written to by the
 * device those changes (and the associated packet) will be lost.
 *
 * To work around this, we make use of non-cached memory if available. If
 * descriptors are mapped uncached there's no need to manually flush them
 * or invalidate them.
 *
 * Note that this only applies to descriptors. The packet data buffers do
 * not have the same constraints since they are 1536 bytes large, so they
 * are unlikely to share cache-lines.
 */
static void *rtl_alloc_descs(unsigned int num)
{
        size_t size = num * RTL8169_DESC_SIZE;

#ifdef CONFIG_SYS_NONCACHED_MEMORY
        return (void *)noncached_alloc(size, RTL8169_ALIGN);
#else
        return memalign(RTL8169_ALIGN, size);
#endif
}

/*
 * Cache maintenance functions. These are simple wrappers around the more
 * general purpose flush_cache() and invalidate_dcache_range() functions.
 */

static void rtl_inval_rx_desc(struct RxDesc *desc)
{
#ifndef CONFIG_SYS_NONCACHED_MEMORY
        unsigned long start = (unsigned long)desc & ~(ARCH_DMA_MINALIGN - 1);
        unsigned long end = ALIGN(start + sizeof(*desc), ARCH_DMA_MINALIGN);

        invalidate_dcache_range(start, end);
#endif
}

static void rtl_flush_rx_desc(struct RxDesc *desc)
{
#ifndef CONFIG_SYS_NONCACHED_MEMORY
        flush_cache((unsigned long)desc, sizeof(*desc));
#endif
}

static void rtl_inval_tx_desc(struct TxDesc *desc)
{
#ifndef CONFIG_SYS_NONCACHED_MEMORY
        unsigned long start = (unsigned long)desc & ~(ARCH_DMA_MINALIGN - 1);
        unsigned long end = ALIGN(start + sizeof(*desc), ARCH_DMA_MINALIGN);

        invalidate_dcache_range(start, end);
#endif
}

static void rtl_flush_tx_desc(struct TxDesc *desc)
{
#ifndef CONFIG_SYS_NONCACHED_MEMORY
        flush_cache((unsigned long)desc, sizeof(*desc));
#endif
}

static void rtl_inval_buffer(void *buf, size_t size)
{
        unsigned long start = (unsigned long)buf & ~(ARCH_DMA_MINALIGN - 1);
        unsigned long end = ALIGN(start + size, ARCH_DMA_MINALIGN);

        invalidate_dcache_range(start, end);
}

static void rtl_flush_buffer(void *buf, size_t size)
{
        flush_cache((unsigned long)buf, size);
}

/**************************************************************************
RECV - Receive a frame
***************************************************************************/
static int rtl_recv(struct eth_device *dev)
{
        /* return true if there's an ethernet packet ready to read */
        /* nic->packet should contain data on return */
        /* nic->packetlen should contain length of data */
        int cur_rx;
        int length = 0;

#ifdef DEBUG_RTL8169_RX
        printf ("%s\n", __FUNCTION__);
#endif
        ioaddr = dev->iobase;

        cur_rx = tpc->cur_rx;

        rtl_inval_rx_desc(&tpc->RxDescArray[cur_rx]);

        if ((le32_to_cpu(tpc->RxDescArray[cur_rx].status) & OWNbit) == 0) {
                if (!(le32_to_cpu(tpc->RxDescArray[cur_rx].status) & RxRES)) {
                        unsigned char rxdata[RX_BUF_LEN];
                        length = (int) (le32_to_cpu(tpc->RxDescArray[cur_rx].
                                                status) & 0x00001FFF) - 4;

                        rtl_inval_buffer(tpc->RxBufferRing[cur_rx], length);
                        memcpy(rxdata, tpc->RxBufferRing[cur_rx], length);

                        if (cur_rx == NUM_RX_DESC - 1)
                                tpc->RxDescArray[cur_rx].status =
                                        cpu_to_le32((OWNbit | EORbit) + RX_BUF_SIZE);
                        else
                                tpc->RxDescArray[cur_rx].status =
                                        cpu_to_le32(OWNbit + RX_BUF_SIZE);
                        tpc->RxDescArray[cur_rx].buf_addr =
                                cpu_to_le32(bus_to_phys(tpc->RxBufferRing[cur_rx]));
                        rtl_flush_rx_desc(&tpc->RxDescArray[cur_rx]);

                        net_process_received_packet(rxdata, length);
                } else {
                        puts("Error Rx");
                }
                cur_rx = (cur_rx + 1) % NUM_RX_DESC;
                tpc->cur_rx = cur_rx;
                return 1;

        } else {
                ushort sts = RTL_R8(IntrStatus);
                RTL_W8(IntrStatus, sts & ~(TxErr | RxErr | SYSErr));
                udelay(100);    /* wait */
        }
        tpc->cur_rx = cur_rx;
        return (0);             /* initially as this is called to flush the input */
}

#define HZ 1000
/**************************************************************************
SEND - Transmit a frame
***************************************************************************/
static int rtl_send(struct eth_device *dev, void *packet, int length)
{
        /* send the packet to destination */

        u32 to;
        u8 *ptxb;
        int entry = tpc->cur_tx % NUM_TX_DESC;
        u32 len = length;
        int ret;

#ifdef DEBUG_RTL8169_TX
        int stime = currticks();
        printf ("%s\n", __FUNCTION__);
        printf("sending %d bytes\n", len);
#endif

        ioaddr = dev->iobase;

        /* point to the current txb incase multiple tx_rings are used */
        ptxb = tpc->Tx_skbuff[entry * MAX_ETH_FRAME_SIZE];
        memcpy(ptxb, (char *)packet, (int)length);
        rtl_flush_buffer(ptxb, length);

        while (len < ETH_ZLEN)
                ptxb[len++] = '\0';

        tpc->TxDescArray[entry].buf_Haddr = 0;
        tpc->TxDescArray[entry].buf_addr = cpu_to_le32(bus_to_phys(ptxb));
        if (entry != (NUM_TX_DESC - 1)) {
                tpc->TxDescArray[entry].status =
                        cpu_to_le32((OWNbit | FSbit | LSbit) |
                                    ((len > ETH_ZLEN) ? len : ETH_ZLEN));
        } else {
                tpc->TxDescArray[entry].status =
                        cpu_to_le32((OWNbit | EORbit | FSbit | LSbit) |
                                    ((len > ETH_ZLEN) ? len : ETH_ZLEN));
        }
        rtl_flush_tx_desc(&tpc->TxDescArray[entry]);
        RTL_W8(TxPoll, 0x40);   /* set polling bit */

        tpc->cur_tx++;
        to = currticks() + TX_TIMEOUT;
        do {
                rtl_inval_tx_desc(&tpc->TxDescArray[entry]);
        } while ((le32_to_cpu(tpc->TxDescArray[entry].status) & OWNbit)
                                && (currticks() < to)); /* wait */

        if (currticks() >= to) {
#ifdef DEBUG_RTL8169_TX
                puts("tx timeout/error\n");
                printf("%s elapsed time : %lu\n", __func__, currticks()-stime);
#endif
                ret = 0;
        } else {
#ifdef DEBUG_RTL8169_TX
                puts("tx done\n");
#endif
                ret = length;
        }
        /* Delay to make net console (nc) work properly */
        udelay(20);
        return ret;
}

static void rtl8169_set_rx_mode(struct eth_device *dev)
{
        u32 mc_filter[2];       /* Multicast hash filter */
        int rx_mode;
        u32 tmp = 0;

#ifdef DEBUG_RTL8169
        printf ("%s\n", __FUNCTION__);
#endif

        /* IFF_ALLMULTI */
        /* Too many to filter perfectly -- accept all multicasts. */
        rx_mode = AcceptBroadcast | AcceptMulticast | AcceptMyPhys;
        mc_filter[1] = mc_filter[0] = 0xffffffff;

        tmp = rtl8169_rx_config | rx_mode | (RTL_R32(RxConfig) &
                                   rtl_chip_info[tpc->chipset].RxConfigMask);

        RTL_W32(RxConfig, tmp);
        RTL_W32(MAR0 + 0, mc_filter[0]);
        RTL_W32(MAR0 + 4, mc_filter[1]);
}

static void rtl8169_hw_start(struct eth_device *dev)
{
        u32 i;

#ifdef DEBUG_RTL8169
        int stime = currticks();
        printf ("%s\n", __FUNCTION__);
#endif

#if 0
        /* Soft reset the chip. */
        RTL_W8(ChipCmd, CmdReset);

        /* Check that the chip has finished the reset. */
        for (i = 1000; i > 0; i--) {
                if ((RTL_R8(ChipCmd) & CmdReset) == 0)
                        break;
                else
                        udelay(10);
        }
#endif

        RTL_W8(Cfg9346, Cfg9346_Unlock);

        /* RTL-8169sb/8110sb or previous version */
        if (tpc->chipset <= 5)
                RTL_W8(ChipCmd, CmdTxEnb | CmdRxEnb);

        RTL_W8(EarlyTxThres, EarlyTxThld);

        /* For gigabit rtl8169 */
        RTL_W16(RxMaxSize, RxPacketMaxSize);

        /* Set Rx Config register */
        i = rtl8169_rx_config | (RTL_R32(RxConfig) &
                                 rtl_chip_info[tpc->chipset].RxConfigMask);
        RTL_W32(RxConfig, i);

        /* Set DMA burst size and Interframe Gap Time */
        RTL_W32(TxConfig, (TX_DMA_BURST << TxDMAShift) |
                                (InterFrameGap << TxInterFrameGapShift));


        tpc->cur_rx = 0;

        RTL_W32(TxDescStartAddrLow, bus_to_phys(tpc->TxDescArray));
        RTL_W32(TxDescStartAddrHigh, (unsigned long)0);
        RTL_W32(RxDescStartAddrLow, bus_to_phys(tpc->RxDescArray));
        RTL_W32(RxDescStartAddrHigh, (unsigned long)0);

        /* RTL-8169sc/8110sc or later version */
        if (tpc->chipset > 5)
                RTL_W8(ChipCmd, CmdTxEnb | CmdRxEnb);

        RTL_W8(Cfg9346, Cfg9346_Lock);
        udelay(10);

        RTL_W32(RxMissed, 0);

        rtl8169_set_rx_mode(dev);

        /* no early-rx interrupts */
        RTL_W16(MultiIntr, RTL_R16(MultiIntr) & 0xF000);

#ifdef DEBUG_RTL8169
        printf("%s elapsed time : %lu\n", __func__, currticks()-stime);
#endif
}

static void rtl8169_init_ring(struct eth_device *dev)
{
        int i;

#ifdef DEBUG_RTL8169
        int stime = currticks();
        printf ("%s\n", __FUNCTION__);
#endif

        tpc->cur_rx = 0;
        tpc->cur_tx = 0;
        tpc->dirty_tx = 0;
        memset(tpc->TxDescArray, 0x0, NUM_TX_DESC * sizeof(struct TxDesc));
        memset(tpc->RxDescArray, 0x0, NUM_RX_DESC * sizeof(struct RxDesc));

        for (i = 0; i < NUM_TX_DESC; i++) {
                tpc->Tx_skbuff[i] = &txb[i];
        }

        for (i = 0; i < NUM_RX_DESC; i++) {
                if (i == (NUM_RX_DESC - 1))
                        tpc->RxDescArray[i].status =
                                cpu_to_le32((OWNbit | EORbit) + RX_BUF_SIZE);
                else
                        tpc->RxDescArray[i].status =
                                cpu_to_le32(OWNbit + RX_BUF_SIZE);

                tpc->RxBufferRing[i] = &rxb[i * RX_BUF_SIZE];
                tpc->RxDescArray[i].buf_addr =
                        cpu_to_le32(bus_to_phys(tpc->RxBufferRing[i]));
                rtl_flush_rx_desc(&tpc->RxDescArray[i]);
        }

#ifdef DEBUG_RTL8169
        printf("%s elapsed time : %lu\n", __func__, currticks()-stime);
#endif
}

/**************************************************************************
RESET - Finish setting up the ethernet interface
***************************************************************************/
static int rtl_reset(struct eth_device *dev, bd_t *bis)
{
        int i;

#ifdef DEBUG_RTL8169
        int stime = currticks();
        printf ("%s\n", __FUNCTION__);
#endif

        rtl8169_init_ring(dev);
        rtl8169_hw_start(dev);
        /* Construct a perfect filter frame with the mac address as first match
         * and broadcast for all others */
        for (i = 0; i < 192; i++)
                txb[i] = 0xFF;

        txb[0] = dev->enetaddr[0];
        txb[1] = dev->enetaddr[1];
        txb[2] = dev->enetaddr[2];
        txb[3] = dev->enetaddr[3];
        txb[4] = dev->enetaddr[4];
        txb[5] = dev->enetaddr[5];

#ifdef DEBUG_RTL8169
        printf("%s elapsed time : %lu\n", __func__, currticks()-stime);
#endif
        return 0;
}

/**************************************************************************
HALT - Turn off ethernet interface
***************************************************************************/
static void rtl_halt(struct eth_device *dev)
{
        int i;

#ifdef DEBUG_RTL8169
        printf ("%s\n", __FUNCTION__);
#endif

        ioaddr = dev->iobase;

        /* Stop the chip's Tx and Rx DMA processes. */
        RTL_W8(ChipCmd, 0x00);

        /* Disable interrupts by clearing the interrupt mask. */
        RTL_W16(IntrMask, 0x0000);

        RTL_W32(RxMissed, 0);

        for (i = 0; i < NUM_RX_DESC; i++) {
                tpc->RxBufferRing[i] = NULL;
        }
}

/**************************************************************************
INIT - Look for an adapter, this routine's visible to the outside
***************************************************************************/

#define board_found 1
#define valid_link 0
static int rtl_init(struct eth_device *dev, bd_t *bis)
{
        static int board_idx = -1;
        int i, rc;
        int option = -1, Cap10_100 = 0, Cap1000 = 0;

#ifdef DEBUG_RTL8169
        printf ("%s\n", __FUNCTION__);
#endif

        ioaddr = dev->iobase;

        board_idx++;

        /* point to private storage */
        tpc = &tpx;

        rc = rtl8169_init_board(dev);
        if (rc)
                return rc;

        /* Get MAC address.  FIXME: read EEPROM */
        for (i = 0; i < MAC_ADDR_LEN; i++)
                dev->enetaddr[i] = RTL_R8(MAC0 + i);

#ifdef DEBUG_RTL8169
        printf("chipset = %d\n", tpc->chipset);
        printf("MAC Address");
        for (i = 0; i < MAC_ADDR_LEN; i++)
                printf(":%02x", dev->enetaddr[i]);
        putc('\n');
#endif

#ifdef DEBUG_RTL8169
        /* Print out some hardware info */
        printf("%s: at ioaddr 0x%lx\n", dev->name, ioaddr);
#endif

        /* if TBI is not endbled */
        if (!(RTL_R8(PHYstatus) & TBI_Enable)) {
                int val = mdio_read(PHY_AUTO_NEGO_REG);

                option = (board_idx >= MAX_UNITS) ? 0 : media[board_idx];
                /* Force RTL8169 in 10/100/1000 Full/Half mode. */
                if (option > 0) {
#ifdef DEBUG_RTL8169
                        printf("%s: Force-mode Enabled.\n", dev->name);
#endif
                        Cap10_100 = 0, Cap1000 = 0;
                        switch (option) {
                        case _10_Half:
                                Cap10_100 = PHY_Cap_10_Half;
                                Cap1000 = PHY_Cap_Null;
                                break;
                        case _10_Full:
                                Cap10_100 = PHY_Cap_10_Full;
                                Cap1000 = PHY_Cap_Null;
                                break;
                        case _100_Half:
                                Cap10_100 = PHY_Cap_100_Half;
                                Cap1000 = PHY_Cap_Null;
                                break;
                        case _100_Full:
                                Cap10_100 = PHY_Cap_100_Full;
                                Cap1000 = PHY_Cap_Null;
                                break;
                        case _1000_Full:
                                Cap10_100 = PHY_Cap_Null;
                                Cap1000 = PHY_Cap_1000_Full;
                                break;
                        default:
                                break;
                        }
                        mdio_write(PHY_AUTO_NEGO_REG, Cap10_100 | (val & 0x1F));        /* leave PHY_AUTO_NEGO_REG bit4:0 unchanged */
                        mdio_write(PHY_1000_CTRL_REG, Cap1000);
                } else {
#ifdef DEBUG_RTL8169
                        printf("%s: Auto-negotiation Enabled.\n",
                               dev->name);
#endif
                        /* enable 10/100 Full/Half Mode, leave PHY_AUTO_NEGO_REG bit4:0 unchanged */
                        mdio_write(PHY_AUTO_NEGO_REG,
                                   PHY_Cap_10_Half | PHY_Cap_10_Full |
                                   PHY_Cap_100_Half | PHY_Cap_100_Full |
                                   (val & 0x1F));

                        /* enable 1000 Full Mode */
                        mdio_write(PHY_1000_CTRL_REG, PHY_Cap_1000_Full);

                }

                /* Enable auto-negotiation and restart auto-nigotiation */
                mdio_write(PHY_CTRL_REG,
                           PHY_Enable_Auto_Nego | PHY_Restart_Auto_Nego);
                udelay(100);

                /* wait for auto-negotiation process */
                for (i = 10000; i > 0; i--) {
                        /* check if auto-negotiation complete */
                        if (mdio_read(PHY_STAT_REG) & PHY_Auto_Nego_Comp) {
                                udelay(100);
                                option = RTL_R8(PHYstatus);
                                if (option & _1000bpsF) {
#ifdef DEBUG_RTL8169
                                        printf("%s: 1000Mbps Full-duplex operation.\n",
                                             dev->name);
#endif
                                } else {
#ifdef DEBUG_RTL8169
                                        printf("%s: %sMbps %s-duplex operation.\n",
                                               dev->name,
                                               (option & _100bps) ? "100" :
                                               "10",
                                               (option & FullDup) ? "Full" :
                                               "Half");
#endif
                                }
                                break;
                        } else {
                                udelay(100);
                        }
                }               /* end for-loop to wait for auto-negotiation process */

        } else {
                udelay(100);
#ifdef DEBUG_RTL8169
                printf
                    ("%s: 1000Mbps Full-duplex operation, TBI Link %s!\n",
                     dev->name,
                     (RTL_R32(TBICSR) & TBILinkOK) ? "OK" : "Failed");
#endif
        }


        tpc->RxDescArray = rtl_alloc_descs(NUM_RX_DESC);
        if (!tpc->RxDescArray)
                return -ENOMEM;

        tpc->TxDescArray = rtl_alloc_descs(NUM_TX_DESC);
        if (!tpc->TxDescArray)
                return -ENOMEM;

        return 0;
}

int rtl8169_initialize(bd_t *bis)
{
        pci_dev_t devno;
        int card_number = 0;
        struct eth_device *dev;
        u32 iobase;
        int idx=0;

        while(1){
                unsigned int region;
                u16 device;
                int err;

                /* Find RTL8169 */
                if ((devno = pci_find_devices(supported, idx++)) < 0)
                        break;

                pci_read_config_word(devno, PCI_DEVICE_ID, &device);
                switch (device) {
                case 0x8168:
                        region = 2;
                        break;

                default:
                        region = 1;
                        break;
                }

                pci_read_config_dword(devno, PCI_BASE_ADDRESS_0 + (region * 4), &iobase);
                iobase &= ~0xf;

                debug ("rtl8169: REALTEK RTL8169 @0x%x\n", iobase);

                dev = (struct eth_device *)malloc(sizeof *dev);

                if (!dev) {
                        printf("Can not allocate memory of rtl8169\n");
                        break;
                }

                memset(dev, 0, sizeof(*dev));
                sprintf (dev->name, "RTL8169#%d", card_number);

                dev->priv = (void *)(unsigned long)devno;
                dev->iobase = (int)pci_mem_to_phys(devno, iobase);

                dev->init = rtl_reset;
                dev->halt = rtl_halt;
                dev->send = rtl_send;
                dev->recv = rtl_recv;

                err = rtl_init(dev, bis);
                if (err < 0) {
                        printf(pr_fmt("failed to initialize card: %d\n"), err);
                        free(dev);
                        continue;
                }

                eth_register (dev);

                card_number++;
        }
        return card_number;
}