Archipelago » qemu

/*

 * QEMU model of the Xilinx Ethernet Lite MAC.

 *

 * Copyright (c) 2009 Edgar E. Iglesias.

 *

 * 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.

 */

#include "sysbus.h"

#include "hw.h"

#include "net/net.h"

#define D(x)

#define R_TX_BUF0     0

#define R_TX_LEN0     (0x07f4 / 4)

#define R_TX_GIE0     (0x07f8 / 4)

#define R_TX_CTRL0    (0x07fc / 4)

#define R_TX_BUF1     (0x0800 / 4)

#define R_TX_LEN1     (0x0ff4 / 4)

#define R_TX_CTRL1    (0x0ffc / 4)

#define R_RX_BUF0     (0x1000 / 4)

#define R_RX_CTRL0    (0x17fc / 4)

#define R_RX_BUF1     (0x1800 / 4)

#define R_RX_CTRL1    (0x1ffc / 4)

#define R_MAX         (0x2000 / 4)

#define GIE_GIE    0x80000000

#define CTRL_I     0x8

#define CTRL_P     0x2

#define CTRL_S     0x1

struct xlx_ethlite

{

    SysBusDevice busdev;

    MemoryRegion mmio;

    qemu_irq irq;

    NICState *nic;

    NICConf conf;

    uint32_t c_tx_pingpong;

    uint32_t c_rx_pingpong;

    unsigned int txbuf;

    unsigned int rxbuf;

    uint32_t regs[R_MAX];

};

static inline void eth_pulse_irq(struct xlx_ethlite *s)

{

    /* Only the first gie reg is active.  */

    if (s->regs[R_TX_GIE0] & GIE_GIE) {

        qemu_irq_pulse(s->irq);

    }

}

static uint64_t

eth_read(void *opaque, hwaddr addr, unsigned int size)

{

    struct xlx_ethlite *s = opaque;

    uint32_t r = 0;

    addr >>= 2;

    switch (addr)

    {

        case R_TX_GIE0:

        case R_TX_LEN0:

        case R_TX_LEN1:

        case R_TX_CTRL1:

        case R_TX_CTRL0:

        case R_RX_CTRL1:

        case R_RX_CTRL0:

            r = s->regs[addr];

            D(qemu_log("%s %x=%x\n", __func__, addr * 4, r));

            break;

        default:

            r = tswap32(s->regs[addr]);

            break;

    }

    return r;

}

static void

eth_write(void *opaque, hwaddr addr,

          uint64_t val64, unsigned int size)

{

    struct xlx_ethlite *s = opaque;

    unsigned int base = 0;

    uint32_t value = val64;

    addr >>= 2;

    switch (addr) 

    {

        case R_TX_CTRL0:

        case R_TX_CTRL1:

            if (addr == R_TX_CTRL1)

                base = 0x800 / 4;

            D(qemu_log("%s addr=%x val=%x\n", __func__, addr * 4, value));

            if ((value & (CTRL_P | CTRL_S)) == CTRL_S) {

                qemu_send_packet(&s->nic->nc,

                                 (void *) &s->regs[base],

                                 s->regs[base + R_TX_LEN0]);

                D(qemu_log("eth_tx %d\n", s->regs[base + R_TX_LEN0]));

                if (s->regs[base + R_TX_CTRL0] & CTRL_I)

                    eth_pulse_irq(s);

            } else if ((value & (CTRL_P | CTRL_S)) == (CTRL_P | CTRL_S)) {

                memcpy(&s->conf.macaddr.a[0], &s->regs[base], 6);

                if (s->regs[base + R_TX_CTRL0] & CTRL_I)

                    eth_pulse_irq(s);

            }

            /* We are fast and get ready pretty much immediately so

               we actually never flip the S nor P bits to one.  */

            s->regs[addr] = value & ~(CTRL_P | CTRL_S);

            break;

        /* Keep these native.  */

        case R_TX_LEN0:

        case R_TX_LEN1:

        case R_TX_GIE0:

        case R_RX_CTRL0:

        case R_RX_CTRL1:

            D(qemu_log("%s addr=%x val=%x\n", __func__, addr * 4, value));

            s->regs[addr] = value;

            break;

        default:

            s->regs[addr] = tswap32(value);

            break;

    }

}

static const MemoryRegionOps eth_ops = {

    .read = eth_read,

    .write = eth_write,

    .endianness = DEVICE_NATIVE_ENDIAN,

    .valid = {

        .min_access_size = 4,

        .max_access_size = 4

    }

};

static int eth_can_rx(NetClientState *nc)

{

    struct xlx_ethlite *s = DO_UPCAST(NICState, nc, nc)->opaque;

    int r;

    r = !(s->regs[R_RX_CTRL0] & CTRL_S);

    return r;

}

static ssize_t eth_rx(NetClientState *nc, const uint8_t *buf, size_t size)

{

    struct xlx_ethlite *s = DO_UPCAST(NICState, nc, nc)->opaque;

    unsigned int rxbase = s->rxbuf * (0x800 / 4);

    /* DA filter.  */

    if (!(buf[0] & 0x80) && memcmp(&s->conf.macaddr.a[0], buf, 6))

        return size;

    if (s->regs[rxbase + R_RX_CTRL0] & CTRL_S) {

        D(qemu_log("ethlite lost packet %x\n", s->regs[R_RX_CTRL0]));

        return -1;

    }

    D(qemu_log("%s %d rxbase=%x\n", __func__, size, rxbase));

    memcpy(&s->regs[rxbase + R_RX_BUF0], buf, size);

    s->regs[rxbase + R_RX_CTRL0] |= CTRL_S;

    if (s->regs[rxbase + R_RX_CTRL0] & CTRL_I)

        eth_pulse_irq(s);

    /* If c_rx_pingpong was set flip buffers.  */

    s->rxbuf ^= s->c_rx_pingpong;

    return size;

}

static void eth_cleanup(NetClientState *nc)

{

    struct xlx_ethlite *s = DO_UPCAST(NICState, nc, nc)->opaque;

    s->nic = NULL;

}

static NetClientInfo net_xilinx_ethlite_info = {

    .type = NET_CLIENT_OPTIONS_KIND_NIC,

    .size = sizeof(NICState),

    .can_receive = eth_can_rx,

    .receive = eth_rx,

    .cleanup = eth_cleanup,

};

static int xilinx_ethlite_init(SysBusDevice *dev)

{

    struct xlx_ethlite *s = FROM_SYSBUS(typeof (*s), dev);

    sysbus_init_irq(dev, &s->irq);

    s->rxbuf = 0;

    memory_region_init_io(&s->mmio, &eth_ops, s, "xlnx.xps-ethernetlite",

                                                                    R_MAX * 4);

    sysbus_init_mmio(dev, &s->mmio);

    qemu_macaddr_default_if_unset(&s->conf.macaddr);

    s->nic = qemu_new_nic(&net_xilinx_ethlite_info, &s->conf,

                          object_get_typename(OBJECT(dev)), dev->qdev.id, s);

    qemu_format_nic_info_str(&s->nic->nc, s->conf.macaddr.a);

    return 0;

}

static Property xilinx_ethlite_properties[] = {

    DEFINE_PROP_UINT32("tx-ping-pong", struct xlx_ethlite, c_tx_pingpong, 1),

    DEFINE_PROP_UINT32("rx-ping-pong", struct xlx_ethlite, c_rx_pingpong, 1),

    DEFINE_NIC_PROPERTIES(struct xlx_ethlite, conf),

    DEFINE_PROP_END_OF_LIST(),

};

static void xilinx_ethlite_class_init(ObjectClass *klass, void *data)

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

    k->init = xilinx_ethlite_init;

    dc->props = xilinx_ethlite_properties;

}

static const TypeInfo xilinx_ethlite_info = {

    .name          = "xlnx.xps-ethernetlite",

    .parent        = TYPE_SYS_BUS_DEVICE,

    .instance_size = sizeof(struct xlx_ethlite),

    .class_init    = xilinx_ethlite_class_init,

};

static void xilinx_ethlite_register_types(void)

{

    type_register_static(&xilinx_ethlite_info);

}

type_init(xilinx_ethlite_register_types)