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mipsnet.c

#include "hw.h"
#include "mips.h"
#include "net.h"
#include "isa.h"

//#define DEBUG_MIPSNET_SEND
//#define DEBUG_MIPSNET_RECEIVE
//#define DEBUG_MIPSNET_DATA
//#define DEBUG_MIPSNET_IRQ

/* MIPSnet register offsets */

#define MIPSNET_DEV_ID        0x00
#define MIPSNET_BUSY          0x08
#define MIPSNET_RX_DATA_COUNT 0x0c
#define MIPSNET_TX_DATA_COUNT 0x10
#define MIPSNET_INT_CTL       0x14
# define MIPSNET_INTCTL_TXDONE            0x00000001
# define MIPSNET_INTCTL_RXDONE            0x00000002
# define MIPSNET_INTCTL_TESTBIT           0x80000000
#define MIPSNET_INTERRUPT_INFO      0x18
#define MIPSNET_RX_DATA_BUFFER      0x1c
#define MIPSNET_TX_DATA_BUFFER      0x20

#define MAX_ETH_FRAME_SIZE    1514

typedef struct MIPSnetState {
    uint32_t busy;
    uint32_t rx_count;
    uint32_t rx_read;
    uint32_t tx_count;
    uint32_t tx_written;
    uint32_t intctl;
    uint8_t rx_buffer[MAX_ETH_FRAME_SIZE];
    uint8_t tx_buffer[MAX_ETH_FRAME_SIZE];
    qemu_irq irq;
    VLANClientState *vc;
    NICInfo *nd;
} MIPSnetState;

static void mipsnet_reset(MIPSnetState *s)
{
    s->busy = 1;
    s->rx_count = 0;
    s->rx_read = 0;
    s->tx_count = 0;
    s->tx_written = 0;
    s->intctl = 0;
    memset(s->rx_buffer, 0, MAX_ETH_FRAME_SIZE);
    memset(s->tx_buffer, 0, MAX_ETH_FRAME_SIZE);
}

static void mipsnet_update_irq(MIPSnetState *s)
{
    int isr = !!s->intctl;
#ifdef DEBUG_MIPSNET_IRQ
    printf("mipsnet: Set IRQ to %d (%02x)\n", isr, s->intctl);
#endif
    qemu_set_irq(s->irq, isr);
}

static int mipsnet_buffer_full(MIPSnetState *s)
{
    if (s->rx_count >= MAX_ETH_FRAME_SIZE)
        return 1;
    return 0;
}

static int mipsnet_can_receive(void *opaque)
{
    MIPSnetState *s = opaque;

    if (s->busy)
        return 0;
    return !mipsnet_buffer_full(s);
}

static void mipsnet_receive(void *opaque, const uint8_t *buf, int size)
{
    MIPSnetState *s = opaque;

#ifdef DEBUG_MIPSNET_RECEIVE
    printf("mipsnet: receiving len=%d\n", size);
#endif
    if (!mipsnet_can_receive(opaque))
        return;

    s->busy = 1;

    /* Just accept everything. */

    /* Write packet data. */
    memcpy(s->rx_buffer, buf, size);

    s->rx_count = size;
    s->rx_read = 0;

    /* Now we can signal we have received something. */
    s->intctl |= MIPSNET_INTCTL_RXDONE;
    mipsnet_update_irq(s);
}

static uint32_t mipsnet_ioport_read(void *opaque, uint32_t addr)
{
    MIPSnetState *s = opaque;
    int ret = 0;

    addr &= 0x3f;
    switch (addr) {
    case MIPSNET_DEV_ID:
      ret = be32_to_cpu(0x4d495053);            /* MIPS */
        break;
    case MIPSNET_DEV_ID + 4:
      ret = be32_to_cpu(0x4e455430);            /* NET0 */
        break;
    case MIPSNET_BUSY:
      ret = s->busy;
        break;
    case MIPSNET_RX_DATA_COUNT:
      ret = s->rx_count;
        break;
    case MIPSNET_TX_DATA_COUNT:
      ret = s->tx_count;
        break;
    case MIPSNET_INT_CTL:
      ret = s->intctl;
        s->intctl &= ~MIPSNET_INTCTL_TESTBIT;
        break;
    case MIPSNET_INTERRUPT_INFO:
        /* XXX: This seems to be a per-VPE interrupt number. */
      ret = 0;
        break;
    case MIPSNET_RX_DATA_BUFFER:
        if (s->rx_count) {
            s->rx_count--;
            ret = s->rx_buffer[s->rx_read++];
        }
        break;
    /* Reads as zero. */
    case MIPSNET_TX_DATA_BUFFER:
    default:
        break;
    }
#ifdef DEBUG_MIPSNET_DATA
    printf("mipsnet: read addr=0x%02x val=0x%02x\n", addr, ret);
#endif
    return ret;
}

static void mipsnet_ioport_write(void *opaque, uint32_t addr, uint32_t val)
{
    MIPSnetState *s = opaque;

    addr &= 0x3f;
#ifdef DEBUG_MIPSNET_DATA
    printf("mipsnet: write addr=0x%02x val=0x%02x\n", addr, val);
#endif
    switch (addr) {
    case MIPSNET_TX_DATA_COUNT:
      s->tx_count = (val <= MAX_ETH_FRAME_SIZE) ? val : 0;
        s->tx_written = 0;
        break;
    case MIPSNET_INT_CTL:
        if (val & MIPSNET_INTCTL_TXDONE) {
            s->intctl &= ~MIPSNET_INTCTL_TXDONE;
        } else if (val & MIPSNET_INTCTL_RXDONE) {
            s->intctl &= ~MIPSNET_INTCTL_RXDONE;
        } else if (val & MIPSNET_INTCTL_TESTBIT) {
            mipsnet_reset(s);
            s->intctl |= MIPSNET_INTCTL_TESTBIT;
        } else if (!val) {
            /* ACK testbit interrupt, flag was cleared on read. */
        }
        s->busy = !!s->intctl;
        mipsnet_update_irq(s);
        break;
    case MIPSNET_TX_DATA_BUFFER:
        s->tx_buffer[s->tx_written++] = val;
        if (s->tx_written == s->tx_count) {
            /* Send buffer. */
#ifdef DEBUG_MIPSNET_SEND
            printf("mipsnet: sending len=%d\n", s->tx_count);
#endif
            qemu_send_packet(s->vc, s->tx_buffer, s->tx_count);
            s->tx_count = s->tx_written = 0;
            s->intctl |= MIPSNET_INTCTL_TXDONE;
            s->busy = 1;
            mipsnet_update_irq(s);
        }
        break;
    /* Read-only registers */
    case MIPSNET_DEV_ID:
    case MIPSNET_BUSY:
    case MIPSNET_RX_DATA_COUNT:
    case MIPSNET_INTERRUPT_INFO:
    case MIPSNET_RX_DATA_BUFFER:
    default:
        break;
    }
}

static void mipsnet_save(QEMUFile *f, void *opaque)
{
    MIPSnetState *s = opaque;

    qemu_put_be32s(f, &s->busy);
    qemu_put_be32s(f, &s->rx_count);
    qemu_put_be32s(f, &s->rx_read);
    qemu_put_be32s(f, &s->tx_count);
    qemu_put_be32s(f, &s->tx_written);
    qemu_put_be32s(f, &s->intctl);
    qemu_put_buffer(f, s->rx_buffer, MAX_ETH_FRAME_SIZE);
    qemu_put_buffer(f, s->tx_buffer, MAX_ETH_FRAME_SIZE);
}

static int mipsnet_load(QEMUFile *f, void *opaque, int version_id)
{
    MIPSnetState *s = opaque;

    if (version_id > 0)
        return -EINVAL;

    qemu_get_be32s(f, &s->busy);
    qemu_get_be32s(f, &s->rx_count);
    qemu_get_be32s(f, &s->rx_read);
    qemu_get_be32s(f, &s->tx_count);
    qemu_get_be32s(f, &s->tx_written);
    qemu_get_be32s(f, &s->intctl);
    qemu_get_buffer(f, s->rx_buffer, MAX_ETH_FRAME_SIZE);
    qemu_get_buffer(f, s->tx_buffer, MAX_ETH_FRAME_SIZE);

    return 0;
}

void mipsnet_init (int base, qemu_irq irq, NICInfo *nd)
{
    MIPSnetState *s;

    qemu_check_nic_model(nd, "mipsnet");

    s = qemu_mallocz(sizeof(MIPSnetState));

    register_ioport_write(base, 36, 1, mipsnet_ioport_write, s);
    register_ioport_read(base, 36, 1, mipsnet_ioport_read, s);
    register_ioport_write(base, 36, 2, mipsnet_ioport_write, s);
    register_ioport_read(base, 36, 2, mipsnet_ioport_read, s);
    register_ioport_write(base, 36, 4, mipsnet_ioport_write, s);
    register_ioport_read(base, 36, 4, mipsnet_ioport_read, s);

    s->irq = irq;
    s->nd = nd;
    if (nd && nd->vlan) {
        s->vc = qemu_new_vlan_client(nd->vlan, nd->model, nd->name,
                                     mipsnet_receive, mipsnet_can_receive, s);
    } else {
        s->vc = NULL;
    }

    qemu_format_nic_info_str(s->vc, s->nd->macaddr);

    mipsnet_reset(s);
    register_savevm("mipsnet", 0, 0, mipsnet_save, mipsnet_load, s);
}

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