/***********************************************************************
 *
 * Copyright (c) 2005 Freescale Semiconductor, Inc.
 *
 * SPDX-License-Identifier:     GPL-2.0+
 *
 * Description:
 *   Ethernet interface for Tundra TSI108 bridge chip
 *
 ***********************************************************************/

#include <config.h>

#if !defined(CONFIG_TSI108_ETH_NUM_PORTS) || (CONFIG_TSI108_ETH_NUM_PORTS > 2)
#error "CONFIG_TSI108_ETH_NUM_PORTS must be defined as 1 or 2"
#endif

#include <common.h>
#include <malloc.h>
#include <net.h>
#include <netdev.h>
#include <asm/cache.h>

#ifdef DEBUG
#define TSI108_ETH_DEBUG 7
#else
#define TSI108_ETH_DEBUG 0
#endif

#if TSI108_ETH_DEBUG > 0
#define debug_lev(lev, fmt, args...) \
if (lev <= TSI108_ETH_DEBUG) \
printf ("%s %d: " fmt, __FUNCTION__, __LINE__, ##args)
#else
#define debug_lev(lev, fmt, args...) do{}while(0)
#endif

#define RX_PRINT_ERRORS
#define TX_PRINT_ERRORS

#define ETH_BASE        (CONFIG_SYS_TSI108_CSR_BASE + 0x6000)

#define ETH_PORT_OFFSET 0x400

#define __REG32(base, offset) (*((volatile u32 *)((char *)(base) + (offset))))

#define reg_MAC_CONFIG_1(base)          __REG32(base, 0x00000000)
#define MAC_CONFIG_1_TX_ENABLE          (0x00000001)
#define MAC_CONFIG_1_SYNC_TX_ENABLE     (0x00000002)
#define MAC_CONFIG_1_RX_ENABLE          (0x00000004)
#define MAC_CONFIG_1_SYNC_RX_ENABLE     (0x00000008)
#define MAC_CONFIG_1_TX_FLOW_CONTROL    (0x00000010)
#define MAC_CONFIG_1_RX_FLOW_CONTROL    (0x00000020)
#define MAC_CONFIG_1_LOOP_BACK          (0x00000100)
#define MAC_CONFIG_1_RESET_TX_FUNCTION  (0x00010000)
#define MAC_CONFIG_1_RESET_RX_FUNCTION  (0x00020000)
#define MAC_CONFIG_1_RESET_TX_MAC       (0x00040000)
#define MAC_CONFIG_1_RESET_RX_MAC       (0x00080000)
#define MAC_CONFIG_1_SIM_RESET          (0x40000000)
#define MAC_CONFIG_1_SOFT_RESET         (0x80000000)

#define reg_MAC_CONFIG_2(base)          __REG32(base, 0x00000004)
#define MAC_CONFIG_2_FULL_DUPLEX        (0x00000001)
#define MAC_CONFIG_2_CRC_ENABLE         (0x00000002)
#define MAC_CONFIG_2_PAD_CRC            (0x00000004)
#define MAC_CONFIG_2_LENGTH_CHECK       (0x00000010)
#define MAC_CONFIG_2_HUGE_FRAME         (0x00000020)
#define MAC_CONFIG_2_INTERFACE_MODE(val)        (((val) & 0x3) << 8)
#define MAC_CONFIG_2_PREAMBLE_LENGTH(val)       (((val) & 0xf) << 12)
#define INTERFACE_MODE_NIBBLE           1       /* 10/100 Mb/s MII) */
#define INTERFACE_MODE_BYTE             2       /* 1000 Mb/s GMII/TBI */

#define reg_MAXIMUM_FRAME_LENGTH(base)          __REG32(base, 0x00000010)

#define reg_MII_MGMT_CONFIG(base)               __REG32(base, 0x00000020)
#define MII_MGMT_CONFIG_MGMT_CLOCK_SELECT(val)  ((val) & 0x7)
#define MII_MGMT_CONFIG_NO_PREAMBLE             (0x00000010)
#define MII_MGMT_CONFIG_SCAN_INCREMENT          (0x00000020)
#define MII_MGMT_CONFIG_RESET_MGMT              (0x80000000)

#define reg_MII_MGMT_COMMAND(base)              __REG32(base, 0x00000024)
#define MII_MGMT_COMMAND_READ_CYCLE             (0x00000001)
#define MII_MGMT_COMMAND_SCAN_CYCLE             (0x00000002)

#define reg_MII_MGMT_ADDRESS(base)              __REG32(base, 0x00000028)
#define reg_MII_MGMT_CONTROL(base)              __REG32(base, 0x0000002c)
#define reg_MII_MGMT_STATUS(base)               __REG32(base, 0x00000030)

#define reg_MII_MGMT_INDICATORS(base)           __REG32(base, 0x00000034)
#define MII_MGMT_INDICATORS_BUSY                (0x00000001)
#define MII_MGMT_INDICATORS_SCAN                (0x00000002)
#define MII_MGMT_INDICATORS_NOT_VALID           (0x00000004)

#define reg_INTERFACE_STATUS(base)              __REG32(base, 0x0000003c)
#define INTERFACE_STATUS_LINK_FAIL              (0x00000008)
#define INTERFACE_STATUS_EXCESS_DEFER           (0x00000200)

#define reg_STATION_ADDRESS_1(base)             __REG32(base, 0x00000040)
#define reg_STATION_ADDRESS_2(base)             __REG32(base, 0x00000044)

#define reg_PORT_CONTROL(base)                  __REG32(base, 0x00000200)
#define PORT_CONTROL_PRI                (0x00000001)
#define PORT_CONTROL_BPT                (0x00010000)
#define PORT_CONTROL_SPD                (0x00040000)
#define PORT_CONTROL_RBC                (0x00080000)
#define PORT_CONTROL_PRB                (0x00200000)
#define PORT_CONTROL_DIS                (0x00400000)
#define PORT_CONTROL_TBI                (0x00800000)
#define PORT_CONTROL_STE                (0x10000000)
#define PORT_CONTROL_ZOR                (0x20000000)
#define PORT_CONTROL_CLR                (0x40000000)
#define PORT_CONTROL_SRT                (0x80000000)

#define reg_TX_CONFIG(base)             __REG32(base, 0x00000220)
#define TX_CONFIG_START_Q               (0x00000003)
#define TX_CONFIG_EHP                   (0x00400000)
#define TX_CONFIG_CHP                   (0x00800000)
#define TX_CONFIG_RST                   (0x80000000)

#define reg_TX_CONTROL(base)            __REG32(base, 0x00000224)
#define TX_CONTROL_GO                   (0x00008000)
#define TX_CONTROL_MP                   (0x01000000)
#define TX_CONTROL_EAI                  (0x20000000)
#define TX_CONTROL_ABT                  (0x40000000)
#define TX_CONTROL_EII                  (0x80000000)

#define reg_TX_STATUS(base)             __REG32(base, 0x00000228)
#define TX_STATUS_QUEUE_USABLE          (0x0000000f)
#define TX_STATUS_CURR_Q                (0x00000300)
#define TX_STATUS_ACT                   (0x00008000)
#define TX_STATUS_QUEUE_IDLE            (0x000f0000)
#define TX_STATUS_EOQ_PENDING           (0x0f000000)

#define reg_TX_EXTENDED_STATUS(base)            __REG32(base, 0x0000022c)
#define TX_EXTENDED_STATUS_END_OF_QUEUE_CONDITION               (0x0000000f)
#define TX_EXTENDED_STATUS_END_OF_FRAME_CONDITION               (0x00000f00)
#define TX_EXTENDED_STATUS_DESCRIPTOR_INTERRUPT_CONDITION       (0x000f0000)
#define TX_EXTENDED_STATUS_ERROR_FLAG                           (0x0f000000)

#define reg_TX_THRESHOLDS(base)                 __REG32(base, 0x00000230)

#define reg_TX_DIAGNOSTIC_ADDR(base)           __REG32(base, 0x00000270)
#define TX_DIAGNOSTIC_ADDR_INDEX                (0x0000007f)
#define TX_DIAGNOSTIC_ADDR_DFR                  (0x40000000)
#define TX_DIAGNOSTIC_ADDR_AI                   (0x80000000)

#define reg_TX_DIAGNOSTIC_DATA(base)            __REG32(base, 0x00000274)

#define reg_TX_ERROR_STATUS(base)               __REG32(base, 0x00000278)
#define TX_ERROR_STATUS                         (0x00000278)
#define TX_ERROR_STATUS_QUEUE_0_ERROR_RESPONSE  (0x0000000f)
#define TX_ERROR_STATUS_TEA_ON_QUEUE_0          (0x00000010)
#define TX_ERROR_STATUS_RER_ON_QUEUE_0          (0x00000020)
#define TX_ERROR_STATUS_TER_ON_QUEUE_0          (0x00000040)
#define TX_ERROR_STATUS_DER_ON_QUEUE_0          (0x00000080)
#define TX_ERROR_STATUS_QUEUE_1_ERROR_RESPONSE  (0x00000f00)
#define TX_ERROR_STATUS_TEA_ON_QUEUE_1          (0x00001000)
#define TX_ERROR_STATUS_RER_ON_QUEUE_1          (0x00002000)
#define TX_ERROR_STATUS_TER_ON_QUEUE_1          (0x00004000)
#define TX_ERROR_STATUS_DER_ON_QUEUE_1          (0x00008000)
#define TX_ERROR_STATUS_QUEUE_2_ERROR_RESPONSE  (0x000f0000)
#define TX_ERROR_STATUS_TEA_ON_QUEUE_2          (0x00100000)
#define TX_ERROR_STATUS_RER_ON_QUEUE_2          (0x00200000)
#define TX_ERROR_STATUS_TER_ON_QUEUE_2          (0x00400000)
#define TX_ERROR_STATUS_DER_ON_QUEUE_2          (0x00800000)
#define TX_ERROR_STATUS_QUEUE_3_ERROR_RESPONSE  (0x0f000000)
#define TX_ERROR_STATUS_TEA_ON_QUEUE_3          (0x10000000)
#define TX_ERROR_STATUS_RER_ON_QUEUE_3          (0x20000000)
#define TX_ERROR_STATUS_TER_ON_QUEUE_3          (0x40000000)
#define TX_ERROR_STATUS_DER_ON_QUEUE_3          (0x80000000)

#define reg_TX_QUEUE_0_CONFIG(base)             __REG32(base, 0x00000280)
#define TX_QUEUE_0_CONFIG_OCN_PORT              (0x0000003f)
#define TX_QUEUE_0_CONFIG_BSWP                  (0x00000400)
#define TX_QUEUE_0_CONFIG_WSWP                  (0x00000800)
#define TX_QUEUE_0_CONFIG_AM                    (0x00004000)
#define TX_QUEUE_0_CONFIG_GVI                   (0x00008000)
#define TX_QUEUE_0_CONFIG_EEI                   (0x00010000)
#define TX_QUEUE_0_CONFIG_ELI                   (0x00020000)
#define TX_QUEUE_0_CONFIG_ENI                   (0x00040000)
#define TX_QUEUE_0_CONFIG_ESI                   (0x00080000)
#define TX_QUEUE_0_CONFIG_EDI                   (0x00100000)

#define reg_TX_QUEUE_0_BUF_CONFIG(base)         __REG32(base, 0x00000284)
#define TX_QUEUE_0_BUF_CONFIG_OCN_PORT          (0x0000003f)
#define TX_QUEUE_0_BUF_CONFIG_BURST             (0x00000300)
#define TX_QUEUE_0_BUF_CONFIG_BSWP              (0x00000400)
#define TX_QUEUE_0_BUF_CONFIG_WSWP              (0x00000800)

#define OCN_PORT_HLP                    0       /* HLP Interface */
#define OCN_PORT_PCI_X                  1       /* PCI-X Interface */
#define OCN_PORT_PROCESSOR_MASTER       2       /* Processor Interface (master) */
#define OCN_PORT_PROCESSOR_SLAVE        3       /* Processor Interface (slave) */
#define OCN_PORT_MEMORY                 4       /* Memory Controller */
#define OCN_PORT_DMA                    5       /* DMA Controller */
#define OCN_PORT_ETHERNET               6       /* Ethernet Controller */
#define OCN_PORT_PRINT                  7       /* Print Engine Interface */

#define reg_TX_QUEUE_0_PTR_LOW(base)            __REG32(base, 0x00000288)

#define reg_TX_QUEUE_0_PTR_HIGH(base)           __REG32(base, 0x0000028c)
#define TX_QUEUE_0_PTR_HIGH_VALID               (0x80000000)

#define reg_RX_CONFIG(base)                     __REG32(base, 0x00000320)
#define RX_CONFIG_DEF_Q                         (0x00000003)
#define RX_CONFIG_EMF                           (0x00000100)
#define RX_CONFIG_EUF                           (0x00000200)
#define RX_CONFIG_BFE                           (0x00000400)
#define RX_CONFIG_MFE                           (0x00000800)
#define RX_CONFIG_UFE                           (0x00001000)
#define RX_CONFIG_SE                            (0x00002000)
#define RX_CONFIG_ABF                           (0x00200000)
#define RX_CONFIG_APE                           (0x00400000)
#define RX_CONFIG_CHP                           (0x00800000)
#define RX_CONFIG_RST                           (0x80000000)

#define reg_RX_CONTROL(base)                    __REG32(base, 0x00000324)
#define GE_E0_RX_CONTROL_QUEUE_ENABLES          (0x0000000f)
#define GE_E0_RX_CONTROL_GO                     (0x00008000)
#define GE_E0_RX_CONTROL_EAI                    (0x20000000)
#define GE_E0_RX_CONTROL_ABT                    (0x40000000)
#define GE_E0_RX_CONTROL_EII                    (0x80000000)

#define reg_RX_EXTENDED_STATUS(base)            __REG32(base, 0x0000032c)
#define RX_EXTENDED_STATUS                      (0x0000032c)
#define RX_EXTENDED_STATUS_EOQ                  (0x0000000f)
#define RX_EXTENDED_STATUS_EOQ_0                (0x00000001)
#define RX_EXTENDED_STATUS_EOF                  (0x00000f00)
#define RX_EXTENDED_STATUS_DESCRIPTOR_INTERRUPT_CONDITION       (0x000f0000)
#define RX_EXTENDED_STATUS_ERROR_FLAG                           (0x0f000000)

#define reg_RX_THRESHOLDS(base)                 __REG32(base, 0x00000330)

#define reg_RX_DIAGNOSTIC_ADDR(base)            __REG32(base, 0x00000370)
#define RX_DIAGNOSTIC_ADDR_INDEX                (0x0000007f)
#define RX_DIAGNOSTIC_ADDR_DFR                  (0x40000000)
#define RX_DIAGNOSTIC_ADDR_AI                   (0x80000000)

#define reg_RX_DIAGNOSTIC_DATA(base)            __REG32(base, 0x00000374)

#define reg_RX_QUEUE_0_CONFIG(base)             __REG32(base, 0x00000380)
#define RX_QUEUE_0_CONFIG_OCN_PORT              (0x0000003f)
#define RX_QUEUE_0_CONFIG_BSWP                  (0x00000400)
#define RX_QUEUE_0_CONFIG_WSWP                  (0x00000800)
#define RX_QUEUE_0_CONFIG_AM                    (0x00004000)
#define RX_QUEUE_0_CONFIG_EEI                   (0x00010000)
#define RX_QUEUE_0_CONFIG_ELI                   (0x00020000)
#define RX_QUEUE_0_CONFIG_ENI                   (0x00040000)
#define RX_QUEUE_0_CONFIG_ESI                   (0x00080000)
#define RX_QUEUE_0_CONFIG_EDI                   (0x00100000)

#define reg_RX_QUEUE_0_BUF_CONFIG(base)         __REG32(base, 0x00000384)
#define RX_QUEUE_0_BUF_CONFIG_OCN_PORT          (0x0000003f)
#define RX_QUEUE_0_BUF_CONFIG_BURST             (0x00000300)
#define RX_QUEUE_0_BUF_CONFIG_BSWP              (0x00000400)
#define RX_QUEUE_0_BUF_CONFIG_WSWP              (0x00000800)

#define reg_RX_QUEUE_0_PTR_LOW(base)            __REG32(base, 0x00000388)

#define reg_RX_QUEUE_0_PTR_HIGH(base)           __REG32(base, 0x0000038c)
#define RX_QUEUE_0_PTR_HIGH_VALID               (0x80000000)

/*
 *  PHY register definitions
 */
/* the first 15 PHY registers are standard. */
#define PHY_CTRL_REG            0       /* Control Register */
#define PHY_STATUS_REG          1       /* Status Regiser */
#define PHY_ID1_REG             2       /* Phy Id Reg (word 1) */
#define PHY_ID2_REG             3       /* Phy Id Reg (word 2) */
#define PHY_AN_ADV_REG          4       /* Autoneg Advertisement */
#define PHY_LP_ABILITY_REG      5       /* Link Partner Ability (Base Page) */
#define PHY_AUTONEG_EXP_REG     6       /* Autoneg Expansion Reg */
#define PHY_NEXT_PAGE_TX_REG    7       /* Next Page TX */
#define PHY_LP_NEXT_PAGE_REG    8       /* Link Partner Next Page */
#define PHY_1000T_CTRL_REG      9       /* 1000Base-T Control Reg */
#define PHY_1000T_STATUS_REG    10      /* 1000Base-T Status Reg */
#define PHY_EXT_STATUS_REG      11      /* Extended Status Reg */

/*
 * PHY Register bit masks.
 */
#define PHY_CTRL_RESET          (1 << 15)
#define PHY_CTRL_LOOPBACK       (1 << 14)
#define PHY_CTRL_SPEED0         (1 << 13)
#define PHY_CTRL_AN_EN          (1 << 12)
#define PHY_CTRL_PWR_DN         (1 << 11)
#define PHY_CTRL_ISOLATE        (1 << 10)
#define PHY_CTRL_RESTART_AN     (1 << 9)
#define PHY_CTRL_FULL_DUPLEX    (1 << 8)
#define PHY_CTRL_CT_EN          (1 << 7)
#define PHY_CTRL_SPEED1         (1 << 6)

#define PHY_STAT_100BASE_T4     (1 << 15)
#define PHY_STAT_100BASE_X_FD   (1 << 14)
#define PHY_STAT_100BASE_X_HD   (1 << 13)
#define PHY_STAT_10BASE_T_FD    (1 << 12)
#define PHY_STAT_10BASE_T_HD    (1 << 11)
#define PHY_STAT_100BASE_T2_FD  (1 << 10)
#define PHY_STAT_100BASE_T2_HD  (1 << 9)
#define PHY_STAT_EXT_STAT       (1 << 8)
#define PHY_STAT_RESERVED       (1 << 7)
#define PHY_STAT_MFPS           (1 << 6)        /* Management Frames Preamble Suppression */
#define PHY_STAT_AN_COMPLETE    (1 << 5)
#define PHY_STAT_REM_FAULT      (1 << 4)
#define PHY_STAT_AN_CAP         (1 << 3)
#define PHY_STAT_LINK_UP        (1 << 2)
#define PHY_STAT_JABBER         (1 << 1)
#define PHY_STAT_EXT_CAP        (1 << 0)

#define TBI_CONTROL_2                                   0x11
#define TBI_CONTROL_2_ENABLE_COMMA_DETECT               0x0001
#define TBI_CONTROL_2_ENABLE_WRAP                       0x0002
#define TBI_CONTROL_2_G_MII_MODE                        0x0010
#define TBI_CONTROL_2_RECEIVE_CLOCK_SELECT              0x0020
#define TBI_CONTROL_2_AUTO_NEGOTIATION_SENSE            0x0100
#define TBI_CONTROL_2_DISABLE_TRANSMIT_RUNNING_DISPARITY        0x1000
#define TBI_CONTROL_2_DISABLE_RECEIVE_RUNNING_DISPARITY         0x2000
#define TBI_CONTROL_2_SHORTCUT_LINK_TIMER                       0x4000
#define TBI_CONTROL_2_SOFT_RESET                                0x8000

/* marvel specific */
#define MV1111_EXT_CTRL1_REG    16      /* PHY Specific Control Reg */
#define MV1111_SPEC_STAT_REG    17      /* PHY Specific Status Reg */
#define MV1111_EXT_CTRL2_REG    20      /* Extended PHY Specific Control Reg */

/*
 * MARVELL 88E1111 PHY register bit masks
 */
/* PHY Specific Status Register (MV1111_EXT_CTRL1_REG) */

#define SPEC_STAT_SPEED_MASK    (3 << 14)
#define SPEC_STAT_FULL_DUP      (1 << 13)
#define SPEC_STAT_PAGE_RCVD     (1 << 12)
#define SPEC_STAT_RESOLVED      (1 << 11)       /* Speed and Duplex Resolved */
#define SPEC_STAT_LINK_UP       (1 << 10)
#define SPEC_STAT_CABLE_LEN_MASK        (7 << 7)/* Cable Length (100/1000 modes only) */
#define SPEC_STAT_MDIX          (1 << 6)
#define SPEC_STAT_POLARITY      (1 << 1)
#define SPEC_STAT_JABBER        (1 << 0)

#define SPEED_1000              (2 << 14)
#define SPEED_100               (1 << 14)
#define SPEED_10                (0 << 14)

#define TBI_ADDR        0x1E    /* Ten Bit Interface address */

/* negotiated link parameters */
#define LINK_SPEED_UNKNOWN      0
#define LINK_SPEED_10           1
#define LINK_SPEED_100          2
#define LINK_SPEED_1000         3

#define LINK_DUPLEX_UNKNOWN     0
#define LINK_DUPLEX_HALF        1
#define LINK_DUPLEX_FULL        2

static unsigned int phy_address[] = { 8, 9 };

#define vuint32 volatile u32

/* TX/RX buffer descriptors. MUST be cache line aligned in memory. (32 byte)
 * This structure is accessed by the ethernet DMA engine which means it
 * MUST be in LITTLE ENDIAN format */
struct dma_descriptor {
        vuint32 start_addr0;    /* buffer address, least significant bytes. */
        vuint32 start_addr1;    /* buffer address, most significant bytes. */
        vuint32 next_descr_addr0;/* next descriptor address, least significant bytes.  Must be 64-bit aligned. */
        vuint32 next_descr_addr1;/* next descriptor address, most significant bytes. */
        vuint32 vlan_byte_count;/* VLAN tag(top 2 bytes) and byte countt (bottom 2 bytes). */
        vuint32 config_status;  /* Configuration/Status. */
        vuint32 reserved1;      /* reserved to make the descriptor cache line aligned. */
        vuint32 reserved2;      /* reserved to make the descriptor cache line aligned. */
};

/* last next descriptor address flag */
#define DMA_DESCR_LAST          (1 << 31)

/* TX DMA descriptor config status bits */
#define DMA_DESCR_TX_EOF        (1 <<  0)       /* end of frame */
#define DMA_DESCR_TX_SOF        (1 <<  1)       /* start of frame */
#define DMA_DESCR_TX_PFVLAN     (1 <<  2)
#define DMA_DESCR_TX_HUGE       (1 <<  3)
#define DMA_DESCR_TX_PAD        (1 <<  4)
#define DMA_DESCR_TX_CRC        (1 <<  5)
#define DMA_DESCR_TX_DESCR_INT  (1 << 14)
#define DMA_DESCR_TX_RETRY_COUNT        0x000F0000
#define DMA_DESCR_TX_ONE_COLLISION      (1 << 20)
#define DMA_DESCR_TX_LATE_COLLISION     (1 << 24)
#define DMA_DESCR_TX_UNDERRUN           (1 << 25)
#define DMA_DESCR_TX_RETRY_LIMIT        (1 << 26)
#define DMA_DESCR_TX_OK                 (1 << 30)
#define DMA_DESCR_TX_OWNER              (1 << 31)

/* RX DMA descriptor status bits */
#define DMA_DESCR_RX_EOF                (1 <<  0)
#define DMA_DESCR_RX_SOF                (1 <<  1)
#define DMA_DESCR_RX_VTF                (1 <<  2)
#define DMA_DESCR_RX_FRAME_IS_TYPE      (1 <<  3)
#define DMA_DESCR_RX_SHORT_FRAME        (1 <<  4)
#define DMA_DESCR_RX_HASH_MATCH         (1 <<  7)
#define DMA_DESCR_RX_BAD_FRAME          (1 <<  8)
#define DMA_DESCR_RX_OVERRUN            (1 <<  9)
#define DMA_DESCR_RX_MAX_FRAME_LEN      (1 << 11)
#define DMA_DESCR_RX_CRC_ERROR          (1 << 12)
#define DMA_DESCR_RX_DESCR_INT          (1 << 13)
#define DMA_DESCR_RX_OWNER              (1 << 15)

#define RX_BUFFER_SIZE  PKTSIZE
#define NUM_RX_DESC     PKTBUFSRX

static struct dma_descriptor tx_descriptor __attribute__ ((aligned(32)));

static struct dma_descriptor rx_descr_array[NUM_RX_DESC]
        __attribute__ ((aligned(32)));

static struct dma_descriptor *rx_descr_current;

static int tsi108_eth_probe (struct eth_device *dev, bd_t * bis);
static int tsi108_eth_send(struct eth_device *dev, void *packet, int length);
static int tsi108_eth_recv (struct eth_device *dev);
static void tsi108_eth_halt (struct eth_device *dev);
static unsigned int read_phy (unsigned int base,
                             unsigned int phy_addr, unsigned int phy_reg);
static void write_phy (unsigned int base,
                      unsigned int phy_addr,
                      unsigned int phy_reg, unsigned int phy_data);

#if TSI108_ETH_DEBUG > 100
/*
 * print phy debug infomation
 */
static void dump_phy_regs (unsigned int phy_addr)
{
        int i;

        printf ("PHY %d registers\n", phy_addr);
        for (i = 0; i <= 30; i++) {
                printf ("%2d  0x%04x\n", i, read_phy (ETH_BASE, phy_addr, i));
        }
        printf ("\n");

}
#else
#define dump_phy_regs(base) do{}while(0)
#endif

#if TSI108_ETH_DEBUG > 100
/*
 * print debug infomation
 */
static void tx_diag_regs (unsigned int base)
{
        int i;
        unsigned long dummy;

        printf ("TX diagnostics registers\n");
        reg_TX_DIAGNOSTIC_ADDR(base) = 0x00 | TX_DIAGNOSTIC_ADDR_AI;
        udelay (1000);
        dummy = reg_TX_DIAGNOSTIC_DATA(base);
        for (i = 0x00; i <= 0x05; i++) {
                udelay (1000);
                printf ("0x%02x  0x%08x\n", i, reg_TX_DIAGNOSTIC_DATA(base));
        }
        reg_TX_DIAGNOSTIC_ADDR(base) = 0x40 | TX_DIAGNOSTIC_ADDR_AI;
        udelay (1000);
        dummy = reg_TX_DIAGNOSTIC_DATA(base);
        for (i = 0x40; i <= 0x47; i++) {
                udelay (1000);
                printf ("0x%02x  0x%08x\n", i, reg_TX_DIAGNOSTIC_DATA(base));
        }
        printf ("\n");

}
#else
#define tx_diag_regs(base) do{}while(0)
#endif

#if TSI108_ETH_DEBUG > 100
/*
 * print debug infomation
 */
static void rx_diag_regs (unsigned int base)
{
        int i;
        unsigned long dummy;

        printf ("RX diagnostics registers\n");
        reg_RX_DIAGNOSTIC_ADDR(base) = 0x00 | RX_DIAGNOSTIC_ADDR_AI;
        udelay (1000);
        dummy = reg_RX_DIAGNOSTIC_DATA(base);
        for (i = 0x00; i <= 0x05; i++) {
                udelay (1000);
                printf ("0x%02x  0x%08x\n", i, reg_RX_DIAGNOSTIC_DATA(base));
        }
        reg_RX_DIAGNOSTIC_ADDR(base) = 0x40 | RX_DIAGNOSTIC_ADDR_AI;
        udelay (1000);
        dummy = reg_RX_DIAGNOSTIC_DATA(base);
        for (i = 0x08; i <= 0x0a; i++) {
                udelay (1000);
                printf ("0x%02x  0x%08x\n", i, reg_RX_DIAGNOSTIC_DATA(base));
        }
        printf ("\n");

}
#else
#define rx_diag_regs(base) do{}while(0)
#endif

#if TSI108_ETH_DEBUG > 100
/*
 * print debug infomation
 */
static void debug_mii_regs (unsigned int base)
{
        printf ("MII_MGMT_CONFIG     0x%08x\n", reg_MII_MGMT_CONFIG(base));
        printf ("MII_MGMT_COMMAND    0x%08x\n", reg_MII_MGMT_COMMAND(base));
        printf ("MII_MGMT_ADDRESS    0x%08x\n", reg_MII_MGMT_ADDRESS(base));
        printf ("MII_MGMT_CONTROL    0x%08x\n", reg_MII_MGMT_CONTROL(base));
        printf ("MII_MGMT_STATUS     0x%08x\n", reg_MII_MGMT_STATUS(base));
        printf ("MII_MGMT_INDICATORS 0x%08x\n", reg_MII_MGMT_INDICATORS(base));
        printf ("\n");

}
#else
#define debug_mii_regs(base) do{}while(0)
#endif

/*
 * Wait until the phy bus is non-busy
 */
static void phy_wait (unsigned int base, unsigned int condition)
{
        int timeout;

        timeout = 0;
        while (reg_MII_MGMT_INDICATORS(base) & condition) {
                udelay (10);
                if (++timeout > 10000) {
                        printf ("ERROR: timeout waiting for phy bus (%d)\n",
                               condition);
                        break;
                }
        }
}

/*
 * read phy register
 */
static unsigned int read_phy (unsigned int base,
                             unsigned int phy_addr, unsigned int phy_reg)
{
        unsigned int value;

        phy_wait (base, MII_MGMT_INDICATORS_BUSY);

        reg_MII_MGMT_ADDRESS(base) = (phy_addr << 8) | phy_reg;

        /* Ensure that the Read Cycle bit is cleared prior to next read cycle */
        reg_MII_MGMT_COMMAND(base) = 0;

        /* start the read */
        reg_MII_MGMT_COMMAND(base) = MII_MGMT_COMMAND_READ_CYCLE;

        /* wait for the read to complete */
        phy_wait (base,
                 MII_MGMT_INDICATORS_NOT_VALID | MII_MGMT_INDICATORS_BUSY);

        value = reg_MII_MGMT_STATUS(base);

        reg_MII_MGMT_COMMAND(base) = 0;

        return value;
}

/*
 * write phy register
 */
static void write_phy (unsigned int base,
                      unsigned int phy_addr,
                      unsigned int phy_reg, unsigned int phy_data)
{
        phy_wait (base, MII_MGMT_INDICATORS_BUSY);

        reg_MII_MGMT_ADDRESS(base) = (phy_addr << 8) | phy_reg;

        /* Ensure that the Read Cycle bit is cleared prior to next cycle */
        reg_MII_MGMT_COMMAND(base) = 0;

        /* start the write */
        reg_MII_MGMT_CONTROL(base) = phy_data;
}

/*
 * configure the marvell 88e1111 phy
 */
static int marvell_88e_phy_config (struct eth_device *dev, int *speed,
                                  int *duplex)
{
        unsigned long base;
        unsigned long phy_addr;
        unsigned int phy_status;
        unsigned int phy_spec_status;
        int timeout;
        int phy_speed;
        int phy_duplex;
        unsigned int value;

        phy_speed = LINK_SPEED_UNKNOWN;
        phy_duplex = LINK_DUPLEX_UNKNOWN;

        base = dev->iobase;
        phy_addr = (unsigned long)dev->priv;

        /* Take the PHY out of reset. */
        write_phy (ETH_BASE, phy_addr, PHY_CTRL_REG, PHY_CTRL_RESET);

        /* Wait for the reset process to complete. */
        udelay (10);
        timeout = 0;
        while ((phy_status =
                read_phy (ETH_BASE, phy_addr, PHY_CTRL_REG)) & PHY_CTRL_RESET) {
                udelay (10);
                if (++timeout > 10000) {
                        printf ("ERROR: timeout waiting for phy reset\n");
                        break;
                }
        }

        /* TBI Configuration. */
        write_phy (base, TBI_ADDR, TBI_CONTROL_2, TBI_CONTROL_2_G_MII_MODE |
                  TBI_CONTROL_2_RECEIVE_CLOCK_SELECT);
        /* Wait for the link to be established. */
        timeout = 0;
        do {
                udelay (20000);
                phy_status = read_phy (ETH_BASE, phy_addr, PHY_STATUS_REG);
                if (++timeout > 100) {
                        debug_lev(1, "ERROR: unable to establish link!!!\n");
                        break;
                }
        } while ((phy_status & PHY_STAT_LINK_UP) == 0);

        if ((phy_status & PHY_STAT_LINK_UP) == 0)
                return 0;

        value = 0;
        phy_spec_status = read_phy (ETH_BASE, phy_addr, MV1111_SPEC_STAT_REG);
        if (phy_spec_status & SPEC_STAT_RESOLVED) {
                switch (phy_spec_status & SPEC_STAT_SPEED_MASK) {
                case SPEED_1000:
                        phy_speed = LINK_SPEED_1000;
                        value |= PHY_CTRL_SPEED1;
                        break;
                case SPEED_100:
                        phy_speed = LINK_SPEED_100;
                        value |= PHY_CTRL_SPEED0;
                        break;
                case SPEED_10:
                        phy_speed = LINK_SPEED_10;
                        break;
                }
                if (phy_spec_status & SPEC_STAT_FULL_DUP) {
                        phy_duplex = LINK_DUPLEX_FULL;
                        value |= PHY_CTRL_FULL_DUPLEX;
                } else
                        phy_duplex = LINK_DUPLEX_HALF;
        }
        /* set TBI speed */
        write_phy (base, TBI_ADDR, PHY_CTRL_REG, value);
        write_phy (base, TBI_ADDR, PHY_AN_ADV_REG, 0x0060);

#if TSI108_ETH_DEBUG > 0
        printf ("%s link is up", dev->name);
        phy_spec_status = read_phy (ETH_BASE, phy_addr, MV1111_SPEC_STAT_REG);
        if (phy_spec_status & SPEC_STAT_RESOLVED) {
                switch (phy_speed) {
                case LINK_SPEED_1000:
                        printf (", 1000 Mbps");
                        break;
                case LINK_SPEED_100:
                        printf (", 100 Mbps");
                        break;
                case LINK_SPEED_10:
                        printf (", 10 Mbps");
                        break;
                }
                if (phy_duplex == LINK_DUPLEX_FULL)
                        printf (", Full duplex");
                else
                        printf (", Half duplex");
        }
        printf ("\n");
#endif

        dump_phy_regs (TBI_ADDR);
        if (speed)
                *speed = phy_speed;
        if (duplex)
                *duplex = phy_duplex;

        return 1;
}

/*
 * External interface
 *
 * register the tsi108 ethernet controllers with the multi-ethernet system
 */
int tsi108_eth_initialize (bd_t * bis)
{
        struct eth_device *dev;
        int index;

        for (index = 0; index < CONFIG_TSI108_ETH_NUM_PORTS; index++) {
                dev = (struct eth_device *)malloc(sizeof(struct eth_device));
                if (!dev) {
                        printf("tsi108: Can not allocate memory\n");
                        break;
                }
                memset(dev, 0, sizeof(*dev));
                sprintf (dev->name, "TSI108_eth%d", index);

                dev->iobase = ETH_BASE + (index * ETH_PORT_OFFSET);
                dev->priv = (void *)(phy_address[index]);
                dev->init = tsi108_eth_probe;
                dev->halt = tsi108_eth_halt;
                dev->send = tsi108_eth_send;
                dev->recv = tsi108_eth_recv;

                eth_register(dev);
        }
        return index;
}

/*
 * probe for and initialize a single ethernet interface
 */
static int tsi108_eth_probe (struct eth_device *dev, bd_t * bis)
{
        unsigned long base;
        unsigned long value;
        int index;
        struct dma_descriptor *tx_descr;
        struct dma_descriptor *rx_descr;
        int speed;
        int duplex;

        base = dev->iobase;

        reg_PORT_CONTROL(base) = PORT_CONTROL_STE | PORT_CONTROL_BPT;

        /* Bring DMA/FIFO out of reset. */
        reg_TX_CONFIG(base) = 0x00000000;
        reg_RX_CONFIG(base) = 0x00000000;

        reg_TX_THRESHOLDS(base) = (192 << 16) | 192;
        reg_RX_THRESHOLDS(base) = (192 << 16) | 112;

        /* Bring MAC out of reset. */
        reg_MAC_CONFIG_1(base) = 0x00000000;

        /* DMA MAC configuration. */
        reg_MAC_CONFIG_1(base) =
            MAC_CONFIG_1_RX_ENABLE | MAC_CONFIG_1_TX_ENABLE;

        reg_MII_MGMT_CONFIG(base) = MII_MGMT_CONFIG_NO_PREAMBLE;
        reg_MAXIMUM_FRAME_LENGTH(base) = RX_BUFFER_SIZE;

        /* Note: Early tsi108 manual did not have correct byte order
         * for the station address.*/
        reg_STATION_ADDRESS_1(base) = (dev->enetaddr[5] << 24) |
            (dev->enetaddr[4] << 16) |
            (dev->enetaddr[3] << 8) | (dev->enetaddr[2] << 0);

        reg_STATION_ADDRESS_2(base) = (dev->enetaddr[1] << 24) |
            (dev->enetaddr[0] << 16);

        if (marvell_88e_phy_config(dev, &speed, &duplex) == 0)
                return -1;

        value =
            MAC_CONFIG_2_PREAMBLE_LENGTH(7) | MAC_CONFIG_2_PAD_CRC |
            MAC_CONFIG_2_CRC_ENABLE;
        if (speed == LINK_SPEED_1000)
                value |= MAC_CONFIG_2_INTERFACE_MODE(INTERFACE_MODE_BYTE);
        else {
                value |= MAC_CONFIG_2_INTERFACE_MODE(INTERFACE_MODE_NIBBLE);
                reg_PORT_CONTROL(base) |= PORT_CONTROL_SPD;
        }
        if (duplex == LINK_DUPLEX_FULL) {
                value |= MAC_CONFIG_2_FULL_DUPLEX;
                reg_PORT_CONTROL(base) &= ~PORT_CONTROL_BPT;
        } else
                reg_PORT_CONTROL(base) |= PORT_CONTROL_BPT;
        reg_MAC_CONFIG_2(base) = value;

        reg_RX_CONFIG(base) = RX_CONFIG_SE;
        reg_RX_QUEUE_0_CONFIG(base) = OCN_PORT_MEMORY;
        reg_RX_QUEUE_0_BUF_CONFIG(base) = OCN_PORT_MEMORY;

        /* initialize the RX DMA descriptors */
        rx_descr = &rx_descr_array[0];
        rx_descr_current = rx_descr;
        for (index = 0; index < NUM_RX_DESC; index++) {
                /* make sure the receive buffers are not in cache */
                invalidate_dcache_range((unsigned long)NetRxPackets[index],
                                        (unsigned long)NetRxPackets[index] +
                                        RX_BUFFER_SIZE);
                rx_descr->start_addr0 =
                    cpu_to_le32((vuint32) NetRxPackets[index]);
                rx_descr->start_addr1 = 0;
                rx_descr->next_descr_addr0 =
                    cpu_to_le32((vuint32) (rx_descr + 1));
                rx_descr->next_descr_addr1 = 0;
                rx_descr->vlan_byte_count = 0;
                rx_descr->config_status = cpu_to_le32((RX_BUFFER_SIZE << 16) |
                                                      DMA_DESCR_RX_OWNER);
                rx_descr++;
        }
        rx_descr--;
        rx_descr->next_descr_addr0 = 0;
        rx_descr->next_descr_addr1 = cpu_to_le32(DMA_DESCR_LAST);
        /* Push the descriptors to RAM so the ethernet DMA can see them */
        invalidate_dcache_range((unsigned long)rx_descr_array,
                                (unsigned long)rx_descr_array +
                                sizeof(rx_descr_array));

        /* enable RX queue */
        reg_RX_CONTROL(base) = TX_CONTROL_GO | 0x01;
        reg_RX_QUEUE_0_PTR_LOW(base) = (u32) rx_descr_current;
        /* enable receive DMA */
        reg_RX_QUEUE_0_PTR_HIGH(base) = RX_QUEUE_0_PTR_HIGH_VALID;

        reg_TX_QUEUE_0_CONFIG(base) = OCN_PORT_MEMORY;
        reg_TX_QUEUE_0_BUF_CONFIG(base) = OCN_PORT_MEMORY;

        /* initialize the TX DMA descriptor */
        tx_descr = &tx_descriptor;

        tx_descr->start_addr0 = 0;
        tx_descr->start_addr1 = 0;
        tx_descr->next_descr_addr0 = 0;
        tx_descr->next_descr_addr1 = cpu_to_le32(DMA_DESCR_LAST);
        tx_descr->vlan_byte_count = 0;
        tx_descr->config_status = cpu_to_le32(DMA_DESCR_TX_OK |
                                              DMA_DESCR_TX_SOF |
                                              DMA_DESCR_TX_EOF);
        /* enable TX queue */
        reg_TX_CONTROL(base) = TX_CONTROL_GO | 0x01;

        return 0;
}

/*
 * send a packet
 */
static int tsi108_eth_send(struct eth_device *dev, void *packet, int length)
{
        unsigned long base;
        int timeout;
        struct dma_descriptor *tx_descr;
        unsigned long status;

        base = dev->iobase;
        tx_descr = &tx_descriptor;

        /* Wait until the last packet has been transmitted. */
        timeout = 0;
        do {
                /* make sure we see the changes made by the DMA engine */
                invalidate_dcache_range((unsigned long)tx_descr,
                                        (unsigned long)tx_descr +
                                        sizeof(struct dma_descriptor));

                if (timeout != 0)
                        udelay (15);
                if (++timeout > 10000) {
                        tx_diag_regs(base);
                        debug_lev(1,
                                  "ERROR: timeout waiting for last transmit packet to be sent\n");
                        return 0;
                }
        } while (tx_descr->config_status & cpu_to_le32(DMA_DESCR_TX_OWNER));

        status = le32_to_cpu(tx_descr->config_status);
        if ((status & DMA_DESCR_TX_OK) == 0) {
#ifdef TX_PRINT_ERRORS
                printf ("TX packet error: 0x%08lx\n    %s%s%s%s\n", status,
                       status & DMA_DESCR_TX_OK ? "tx error, " : "",
                       status & DMA_DESCR_TX_RETRY_LIMIT ?
                       "retry limit reached, " : "",
                       status & DMA_DESCR_TX_UNDERRUN ? "underrun, " : "",
                       status & DMA_DESCR_TX_LATE_COLLISION ? "late collision, "
                       : "");
#endif
        }

        debug_lev (9, "sending packet %d\n", length);
        tx_descr->start_addr0 = cpu_to_le32((vuint32) packet);
        tx_descr->start_addr1 = 0;
        tx_descr->next_descr_addr0 = 0;
        tx_descr->next_descr_addr1 = cpu_to_le32(DMA_DESCR_LAST);
        tx_descr->vlan_byte_count = cpu_to_le32(length);
        tx_descr->config_status = cpu_to_le32(DMA_DESCR_TX_OWNER |
                                              DMA_DESCR_TX_CRC |
                                              DMA_DESCR_TX_PAD |
                                              DMA_DESCR_TX_SOF |
                                              DMA_DESCR_TX_EOF);

        invalidate_dcache_range((unsigned long)tx_descr,
                                (unsigned long)tx_descr +
                                sizeof(struct dma_descriptor));

        invalidate_dcache_range((unsigned long)packet,
                                (unsigned long)packet + length);

        reg_TX_QUEUE_0_PTR_LOW(base) = (u32) tx_descr;
        reg_TX_QUEUE_0_PTR_HIGH(base) = TX_QUEUE_0_PTR_HIGH_VALID;

        return length;
}

/*
 * Check for received packets and send them up the protocal stack
 */
static int tsi108_eth_recv (struct eth_device *dev)
{
        struct dma_descriptor *rx_descr;
        unsigned long base;
        int length = 0;
        unsigned long status;
        uchar *buffer;

        base = dev->iobase;

        /* make sure we see the changes made by the DMA engine */
        invalidate_dcache_range ((unsigned long)rx_descr_array,
                                (unsigned long)rx_descr_array +
                                sizeof(rx_descr_array));

        /* process all of the received packets */
        rx_descr = rx_descr_current;
        while ((rx_descr->config_status & cpu_to_le32(DMA_DESCR_RX_OWNER)) == 0) {
                /* check for error */
                status = le32_to_cpu(rx_descr->config_status);
                if (status & DMA_DESCR_RX_BAD_FRAME) {
#ifdef RX_PRINT_ERRORS
                        printf ("RX packet error: 0x%08lx\n    %s%s%s%s%s%s\n",
                               status,
                               status & DMA_DESCR_RX_FRAME_IS_TYPE ? "too big, "
                               : "",
                               status & DMA_DESCR_RX_SHORT_FRAME ? "too short, "
                               : "",
                               status & DMA_DESCR_RX_BAD_FRAME ? "bad frame, " :
                               "",
                               status & DMA_DESCR_RX_OVERRUN ? "overrun, " : "",
                               status & DMA_DESCR_RX_MAX_FRAME_LEN ?
                               "max length, " : "",
                               status & DMA_DESCR_RX_CRC_ERROR ? "CRC error, " :
                               "");
#endif
                } else {
                        length =
                            le32_to_cpu(rx_descr->vlan_byte_count) & 0xFFFF;

                        /*** process packet ***/
                        buffer = (uchar *)(le32_to_cpu(rx_descr->start_addr0));
                        NetReceive(buffer, length);

                        invalidate_dcache_range ((unsigned long)buffer,
                                                (unsigned long)buffer +
                                                RX_BUFFER_SIZE);
                }
                /* Give this buffer back to the DMA engine */
                rx_descr->vlan_byte_count = 0;
                rx_descr->config_status = cpu_to_le32 ((RX_BUFFER_SIZE << 16) |
                                                      DMA_DESCR_RX_OWNER);
                /* move descriptor pointer forward */
                rx_descr =
                    (struct dma_descriptor
                     *)(le32_to_cpu (rx_descr->next_descr_addr0));
                if (rx_descr == 0)
                        rx_descr = &rx_descr_array[0];
        }
        /* remember where we are for next time */
        rx_descr_current = rx_descr;

        /* If the DMA engine has reached the end of the queue
         * start over at the begining */
        if (reg_RX_EXTENDED_STATUS(base) & RX_EXTENDED_STATUS_EOQ_0) {

                reg_RX_EXTENDED_STATUS(base) = RX_EXTENDED_STATUS_EOQ_0;
                reg_RX_QUEUE_0_PTR_LOW(base) = (u32) & rx_descr_array[0];
                reg_RX_QUEUE_0_PTR_HIGH(base) = RX_QUEUE_0_PTR_HIGH_VALID;
        }

        return length;
}

/*
 * disable an ethernet interface
 */
static void tsi108_eth_halt (struct eth_device *dev)
{
        unsigned long base;

        base = dev->iobase;

        /* Put DMA/FIFO into reset state. */
        reg_TX_CONFIG(base) = TX_CONFIG_RST;
        reg_RX_CONFIG(base) = RX_CONFIG_RST;

        /* Put MAC into reset state. */
        reg_MAC_CONFIG_1(base) = MAC_CONFIG_1_SOFT_RESET;
}