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#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];
int io_base;
qemu_irq irq;
VLANClientState *vc;
} 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;
}
static void mipsnet_cleanup(VLANClientState *vc)
{
MIPSnetState *s = vc->opaque;
unregister_savevm("mipsnet", s);
isa_unassign_ioport(s->io_base, 36);
qemu_free(s);
}
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->io_base = base;
s->irq = irq;
if (nd && nd->vlan) {
s->vc = qemu_new_vlan_client(nd->vlan, nd->model, nd->name,
mipsnet_receive, mipsnet_can_receive,
mipsnet_cleanup, s);
} else {
s->vc = NULL;
}
qemu_format_nic_info_str(s->vc, nd->macaddr);
mipsnet_reset(s);
register_savevm("mipsnet", 0, 0, mipsnet_save, mipsnet_load, s);
}
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