/*
 * QEMU Freescale eTSEC Emulator
 *
 * Copyright (c) 2011-2013 AdaCore
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#ifndef ETSEC_H
#define ETSEC_H

#include "hw/sysbus.h"
#include "net/net.h"
#include "hw/ptimer.h"
#include "qom/object.h"

/* Buffer Descriptors */

typedef struct eTSEC_rxtx_bd {
    uint16_t flags;
    uint16_t length;
    uint32_t bufptr;
} eTSEC_rxtx_bd;

#define BD_WRAP       (1 << 13)
#define BD_INTERRUPT  (1 << 12)
#define BD_LAST       (1 << 11)

#define BD_TX_READY     (1 << 15)
#define BD_TX_PADCRC    (1 << 14)
#define BD_TX_TC        (1 << 10)
#define BD_TX_PREDEF    (1 << 9)
#define BD_TX_HFELC     (1 << 7)
#define BD_TX_CFRL      (1 << 6)
#define BD_TX_RC_MASK   0xF
#define BD_TX_RC_OFFSET 0x2
#define BD_TX_TOEUN     (1 << 1)
#define BD_TX_TR        (1 << 0)

#define BD_RX_EMPTY     (1 << 15)
#define BD_RX_RO1       (1 << 14)
#define BD_RX_FIRST     (1 << 10)
#define BD_RX_MISS      (1 << 8)
#define BD_RX_BROADCAST (1 << 7)
#define BD_RX_MULTICAST (1 << 6)
#define BD_RX_LG        (1 << 5)
#define BD_RX_NO        (1 << 4)
#define BD_RX_SH        (1 << 3)
#define BD_RX_CR        (1 << 2)
#define BD_RX_OV        (1 << 1)
#define BD_RX_TR        (1 << 0)

/* Tx FCB flags */
#define FCB_TX_VLN     (1 << 7)
#define FCB_TX_IP      (1 << 6)
#define FCB_TX_IP6     (1 << 5)
#define FCB_TX_TUP     (1 << 4)
#define FCB_TX_UDP     (1 << 3)
#define FCB_TX_CIP     (1 << 2)
#define FCB_TX_CTU     (1 << 1)
#define FCB_TX_NPH     (1 << 0)

/* PHY Status Register */
#define MII_SR_EXTENDED_CAPS     0x0001    /* Extended register capabilities */
#define MII_SR_JABBER_DETECT     0x0002    /* Jabber Detected */
#define MII_SR_LINK_STATUS       0x0004    /* Link Status 1 = link */
#define MII_SR_AUTONEG_CAPS      0x0008    /* Auto Neg Capable */
#define MII_SR_REMOTE_FAULT      0x0010    /* Remote Fault Detect */
#define MII_SR_AUTONEG_COMPLETE  0x0020    /* Auto Neg Complete */
#define MII_SR_PREAMBLE_SUPPRESS 0x0040    /* Preamble may be suppressed */
#define MII_SR_EXTENDED_STATUS   0x0100    /* Ext. status info in Reg 0x0F */
#define MII_SR_100T2_HD_CAPS     0x0200    /* 100T2 Half Duplex Capable */
#define MII_SR_100T2_FD_CAPS     0x0400    /* 100T2 Full Duplex Capable */
#define MII_SR_10T_HD_CAPS       0x0800    /* 10T   Half Duplex Capable */
#define MII_SR_10T_FD_CAPS       0x1000    /* 10T   Full Duplex Capable */
#define MII_SR_100X_HD_CAPS      0x2000    /* 100X  Half Duplex Capable */
#define MII_SR_100X_FD_CAPS      0x4000    /* 100X  Full Duplex Capable */
#define MII_SR_100T4_CAPS        0x8000    /* 100T4 Capable */

/* eTSEC */

/* Number of register in the device */
#define ETSEC_REG_NUMBER 1024

typedef struct eTSEC_Register {
    const char *name;
    const char *desc;
    uint32_t    access;
    uint32_t    value;
} eTSEC_Register;

struct eTSEC {
    SysBusDevice  busdev;

    MemoryRegion  io_area;

    eTSEC_Register regs[ETSEC_REG_NUMBER];

    NICState *nic;
    NICConf   conf;

    /* Tx */

    uint8_t       *tx_buffer;
    uint32_t       tx_buffer_len;
    eTSEC_rxtx_bd  first_bd;

    /* Rx */

    uint8_t       *rx_buffer;
    uint32_t       rx_buffer_len;
    uint32_t       rx_remaining_data;
    uint8_t        rx_first_in_frame;
    uint8_t        rx_fcb_size;
    eTSEC_rxtx_bd  rx_first_bd;
    uint8_t        rx_fcb[10];
    uint32_t       rx_padding;

    /* IRQs */
    qemu_irq     tx_irq;
    qemu_irq     rx_irq;
    qemu_irq     err_irq;


    uint16_t phy_status;
    uint16_t phy_control;

    /* Polling */
    struct ptimer_state *ptimer;

    /* Whether we should flush the rx queue when buffer becomes available. */
    bool need_flush;
};
typedef struct eTSEC eTSEC;

#define TYPE_ETSEC_COMMON "eTSEC"
DECLARE_INSTANCE_CHECKER(eTSEC, ETSEC_COMMON,
                         TYPE_ETSEC_COMMON)

#define eTSEC_TRANSMIT 1
#define eTSEC_RECEIVE  2

DeviceState *etsec_create(hwaddr        base,
                          MemoryRegion *mr,
                          NICInfo      *nd,
                          qemu_irq      tx_irq,
                          qemu_irq      rx_irq,
                          qemu_irq      err_irq);

void etsec_update_irq(eTSEC *etsec);

void etsec_walk_tx_ring(eTSEC *etsec, int ring_nbr);
void etsec_walk_rx_ring(eTSEC *etsec, int ring_nbr);
ssize_t etsec_rx_ring_write(eTSEC *etsec, const uint8_t *buf, size_t size);

void etsec_write_miim(eTSEC          *etsec,
                      eTSEC_Register *reg,
                      uint32_t        reg_index,
                      uint32_t        value);

void etsec_miim_link_status(eTSEC *etsec, NetClientState *nc);

#endif /* ETSEC_H */