298 lines
7.8 KiB
C
298 lines
7.8 KiB
C
#include "qemu/osdep.h"
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#include "hw/irq.h"
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#include "hw/qdev-properties.h"
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#include "net/net.h"
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#include "qemu/module.h"
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#include "trace.h"
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#include "hw/sysbus.h"
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#include "migration/vmstate.h"
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#include "qom/object.h"
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/* MIPSnet register offsets */
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#define MIPSNET_DEV_ID 0x00
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#define MIPSNET_BUSY 0x08
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#define MIPSNET_RX_DATA_COUNT 0x0c
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#define MIPSNET_TX_DATA_COUNT 0x10
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#define MIPSNET_INT_CTL 0x14
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# define MIPSNET_INTCTL_TXDONE 0x00000001
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# define MIPSNET_INTCTL_RXDONE 0x00000002
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# define MIPSNET_INTCTL_TESTBIT 0x80000000
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#define MIPSNET_INTERRUPT_INFO 0x18
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#define MIPSNET_RX_DATA_BUFFER 0x1c
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#define MIPSNET_TX_DATA_BUFFER 0x20
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#define MAX_ETH_FRAME_SIZE 1514
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#define TYPE_MIPS_NET "mipsnet"
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OBJECT_DECLARE_SIMPLE_TYPE(MIPSnetState, MIPS_NET)
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struct MIPSnetState {
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SysBusDevice parent_obj;
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uint32_t busy;
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uint32_t rx_count;
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uint32_t rx_read;
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uint32_t tx_count;
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uint32_t tx_written;
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uint32_t intctl;
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uint8_t rx_buffer[MAX_ETH_FRAME_SIZE];
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uint8_t tx_buffer[MAX_ETH_FRAME_SIZE];
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MemoryRegion io;
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qemu_irq irq;
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NICState *nic;
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NICConf conf;
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};
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static void mipsnet_reset(MIPSnetState *s)
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{
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s->busy = 1;
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s->rx_count = 0;
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s->rx_read = 0;
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s->tx_count = 0;
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s->tx_written = 0;
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s->intctl = 0;
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memset(s->rx_buffer, 0, MAX_ETH_FRAME_SIZE);
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memset(s->tx_buffer, 0, MAX_ETH_FRAME_SIZE);
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}
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static void mipsnet_update_irq(MIPSnetState *s)
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{
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int isr = !!s->intctl;
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trace_mipsnet_irq(isr, s->intctl);
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qemu_set_irq(s->irq, isr);
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}
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static int mipsnet_buffer_full(MIPSnetState *s)
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{
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if (s->rx_count >= MAX_ETH_FRAME_SIZE) {
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return 1;
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}
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return 0;
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}
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static int mipsnet_can_receive(NetClientState *nc)
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{
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MIPSnetState *s = qemu_get_nic_opaque(nc);
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if (s->busy) {
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return 0;
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}
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return !mipsnet_buffer_full(s);
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}
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static ssize_t mipsnet_receive(NetClientState *nc,
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const uint8_t *buf, size_t size)
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{
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MIPSnetState *s = qemu_get_nic_opaque(nc);
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trace_mipsnet_receive(size);
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if (!mipsnet_can_receive(nc)) {
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return 0;
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}
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if (size >= sizeof(s->rx_buffer)) {
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return 0;
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}
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s->busy = 1;
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/* Just accept everything. */
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/* Write packet data. */
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memcpy(s->rx_buffer, buf, size);
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s->rx_count = size;
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s->rx_read = 0;
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/* Now we can signal we have received something. */
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s->intctl |= MIPSNET_INTCTL_RXDONE;
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mipsnet_update_irq(s);
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return size;
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}
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static uint64_t mipsnet_ioport_read(void *opaque, hwaddr addr,
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unsigned int size)
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{
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MIPSnetState *s = opaque;
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int ret = 0;
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addr &= 0x3f;
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switch (addr) {
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case MIPSNET_DEV_ID:
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ret = be32_to_cpu(0x4d495053); /* MIPS */
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break;
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case MIPSNET_DEV_ID + 4:
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ret = be32_to_cpu(0x4e455430); /* NET0 */
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break;
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case MIPSNET_BUSY:
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ret = s->busy;
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break;
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case MIPSNET_RX_DATA_COUNT:
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ret = s->rx_count;
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break;
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case MIPSNET_TX_DATA_COUNT:
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ret = s->tx_count;
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break;
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case MIPSNET_INT_CTL:
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ret = s->intctl;
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s->intctl &= ~MIPSNET_INTCTL_TESTBIT;
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break;
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case MIPSNET_INTERRUPT_INFO:
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/* XXX: This seems to be a per-VPE interrupt number. */
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ret = 0;
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break;
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case MIPSNET_RX_DATA_BUFFER:
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if (s->rx_count) {
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s->rx_count--;
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ret = s->rx_buffer[s->rx_read++];
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if (mipsnet_can_receive(s->nic->ncs)) {
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qemu_flush_queued_packets(qemu_get_queue(s->nic));
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}
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}
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break;
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/* Reads as zero. */
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case MIPSNET_TX_DATA_BUFFER:
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default:
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break;
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}
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trace_mipsnet_read(addr, ret);
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return ret;
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}
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static void mipsnet_ioport_write(void *opaque, hwaddr addr,
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uint64_t val, unsigned int size)
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{
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MIPSnetState *s = opaque;
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addr &= 0x3f;
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trace_mipsnet_write(addr, val);
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switch (addr) {
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case MIPSNET_TX_DATA_COUNT:
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s->tx_count = (val <= MAX_ETH_FRAME_SIZE) ? val : 0;
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s->tx_written = 0;
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break;
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case MIPSNET_INT_CTL:
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if (val & MIPSNET_INTCTL_TXDONE) {
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s->intctl &= ~MIPSNET_INTCTL_TXDONE;
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} else if (val & MIPSNET_INTCTL_RXDONE) {
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s->intctl &= ~MIPSNET_INTCTL_RXDONE;
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} else if (val & MIPSNET_INTCTL_TESTBIT) {
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mipsnet_reset(s);
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s->intctl |= MIPSNET_INTCTL_TESTBIT;
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} else if (!val) {
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/* ACK testbit interrupt, flag was cleared on read. */
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}
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s->busy = !!s->intctl;
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mipsnet_update_irq(s);
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if (mipsnet_can_receive(s->nic->ncs)) {
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qemu_flush_queued_packets(qemu_get_queue(s->nic));
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}
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break;
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case MIPSNET_TX_DATA_BUFFER:
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s->tx_buffer[s->tx_written++] = val;
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if ((s->tx_written >= MAX_ETH_FRAME_SIZE)
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|| (s->tx_written == s->tx_count)) {
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/* Send buffer. */
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trace_mipsnet_send(s->tx_written);
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qemu_send_packet(qemu_get_queue(s->nic),
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s->tx_buffer, s->tx_written);
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s->tx_count = s->tx_written = 0;
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s->intctl |= MIPSNET_INTCTL_TXDONE;
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s->busy = 1;
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mipsnet_update_irq(s);
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}
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break;
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/* Read-only registers */
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case MIPSNET_DEV_ID:
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case MIPSNET_BUSY:
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case MIPSNET_RX_DATA_COUNT:
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case MIPSNET_INTERRUPT_INFO:
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case MIPSNET_RX_DATA_BUFFER:
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default:
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break;
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}
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}
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static const VMStateDescription vmstate_mipsnet = {
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.name = "mipsnet",
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.version_id = 0,
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.minimum_version_id = 0,
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.fields = (VMStateField[]) {
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VMSTATE_UINT32(busy, MIPSnetState),
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VMSTATE_UINT32(rx_count, MIPSnetState),
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VMSTATE_UINT32(rx_read, MIPSnetState),
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VMSTATE_UINT32(tx_count, MIPSnetState),
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VMSTATE_UINT32(tx_written, MIPSnetState),
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VMSTATE_UINT32(intctl, MIPSnetState),
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VMSTATE_BUFFER(rx_buffer, MIPSnetState),
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VMSTATE_BUFFER(tx_buffer, MIPSnetState),
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VMSTATE_END_OF_LIST()
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}
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};
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static NetClientInfo net_mipsnet_info = {
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.type = NET_CLIENT_DRIVER_NIC,
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.size = sizeof(NICState),
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.receive = mipsnet_receive,
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};
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static const MemoryRegionOps mipsnet_ioport_ops = {
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.read = mipsnet_ioport_read,
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.write = mipsnet_ioport_write,
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.impl.min_access_size = 1,
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.impl.max_access_size = 4,
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};
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static void mipsnet_realize(DeviceState *dev, Error **errp)
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{
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SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
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MIPSnetState *s = MIPS_NET(dev);
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memory_region_init_io(&s->io, OBJECT(dev), &mipsnet_ioport_ops, s,
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"mipsnet-io", 36);
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sysbus_init_mmio(sbd, &s->io);
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sysbus_init_irq(sbd, &s->irq);
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s->nic = qemu_new_nic(&net_mipsnet_info, &s->conf,
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object_get_typename(OBJECT(dev)), dev->id, s);
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qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);
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}
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static void mipsnet_sysbus_reset(DeviceState *dev)
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{
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MIPSnetState *s = MIPS_NET(dev);
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mipsnet_reset(s);
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}
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static Property mipsnet_properties[] = {
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DEFINE_NIC_PROPERTIES(MIPSnetState, conf),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void mipsnet_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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dc->realize = mipsnet_realize;
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set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
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dc->desc = "MIPS Simulator network device";
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dc->reset = mipsnet_sysbus_reset;
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dc->vmsd = &vmstate_mipsnet;
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device_class_set_props(dc, mipsnet_properties);
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}
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static const TypeInfo mipsnet_info = {
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.name = TYPE_MIPS_NET,
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(MIPSnetState),
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.class_init = mipsnet_class_init,
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};
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static void mipsnet_register_types(void)
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{
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type_register_static(&mipsnet_info);
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}
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type_init(mipsnet_register_types)
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