static void dp8393x_watchdog(void *opaque)
{
dp8393xState *s = opaque;
if (s->regs[SONIC_CR] & SONIC_CR_STP) {
return;
}
s->regs[SONIC_WT1] = 0xffff;
s->regs[SONIC_WT0] = 0xffff;
dp8393x_set_next_tick(s);
/* Signal underflow */
s->regs[SONIC_ISR] |= SONIC_ISR_TC;
dp8393x_update_irq(s);
}
static void do_load_cam(dp8393xState *s)
{
uint16_t data[8];
int width, size;
uint16_t index = 0;
width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;
size = sizeof(uint16_t) * 4 * width;
while (s->regs[SONIC_CDC] & 0x1f) {
/* Fill current entry */
s->memory_rw(s->mem_opaque,
(s->regs[SONIC_URRA] << 16) | s->regs[SONIC_CDP],
(uint8_t *)data, size, 0);
s->cam[index][0] = data[1 * width] & 0xff;
s->cam[index][1] = data[1 * width] >> 8;
s->cam[index][2] = data[2 * width] & 0xff;
s->cam[index][3] = data[2 * width] >> 8;
s->cam[index][4] = data[3 * width] & 0xff;
s->cam[index][5] = data[3 * width] >> 8;
DPRINTF("load cam[%d] with %02x%02x%02x%02x%02x%02x\n", index,
s->cam[index][0], s->cam[index][1], s->cam[index][2],
s->cam[index][3], s->cam[index][4], s->cam[index][5]);
/* Move to next entry */
s->regs[SONIC_CDC]--;
s->regs[SONIC_CDP] += size;
index++;
}
/* Read CAM enable */
s->memory_rw(s->mem_opaque,
(s->regs[SONIC_URRA] << 16) | s->regs[SONIC_CDP],
(uint8_t *)data, size, 0);
s->regs[SONIC_CE] = data[0 * width];
DPRINTF("load cam done. cam enable mask 0x%04x\n", s->regs[SONIC_CE]);
/* Done */
s->regs[SONIC_CR] &= ~SONIC_CR_LCAM;
s->regs[SONIC_ISR] |= SONIC_ISR_LCD;
dp8393x_update_irq(s);
}
static void do_read_rra(dp8393xState *s)
{
uint16_t data[8];
int width, size;
/* Read memory */
width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;
size = sizeof(uint16_t) * 4 * width;
s->memory_rw(s->mem_opaque,
(s->regs[SONIC_URRA] << 16) | s->regs[SONIC_RRP],
(uint8_t *)data, size, 0);
/* Update SONIC registers */
s->regs[SONIC_CRBA0] = data[0 * width];
s->regs[SONIC_CRBA1] = data[1 * width];
s->regs[SONIC_RBWC0] = data[2 * width];
s->regs[SONIC_RBWC1] = data[3 * width];
DPRINTF("CRBA0/1: 0x%04x/0x%04x, RBWC0/1: 0x%04x/0x%04x\n",
s->regs[SONIC_CRBA0], s->regs[SONIC_CRBA1],
s->regs[SONIC_RBWC0], s->regs[SONIC_RBWC1]);
/* Go to next entry */
s->regs[SONIC_RRP] += size;
/* Handle wrap */
if (s->regs[SONIC_RRP] == s->regs[SONIC_REA]) {
s->regs[SONIC_RRP] = s->regs[SONIC_RSA];
}
/* Check resource exhaustion */
if (s->regs[SONIC_RRP] == s->regs[SONIC_RWP])
{
s->regs[SONIC_ISR] |= SONIC_ISR_RBE;
dp8393x_update_irq(s);
}
/* Done */
s->regs[SONIC_CR] &= ~SONIC_CR_RRRA;
}
static void nic_reset(void *opaque)
{
dp8393xState *s = opaque;
qemu_del_timer(s->watchdog);
s->regs[SONIC_CR] = SONIC_CR_RST | SONIC_CR_STP | SONIC_CR_RXDIS;
s->regs[SONIC_DCR] &= ~(SONIC_DCR_EXBUS | SONIC_DCR_LBR);
s->regs[SONIC_RCR] &= ~(SONIC_RCR_LB0 | SONIC_RCR_LB1 | SONIC_RCR_BRD | SONIC_RCR_RNT);
s->regs[SONIC_TCR] |= SONIC_TCR_NCRS | SONIC_TCR_PTX;
s->regs[SONIC_TCR] &= ~SONIC_TCR_BCM;
s->regs[SONIC_IMR] = 0;
s->regs[SONIC_ISR] = 0;
s->regs[SONIC_DCR2] = 0;
s->regs[SONIC_EOBC] = 0x02F8;
s->regs[SONIC_RSC] = 0;
s->regs[SONIC_CE] = 0;
s->regs[SONIC_RSC] = 0;
/* Network cable is connected */
s->regs[SONIC_RCR] |= SONIC_RCR_CRS;
dp8393x_update_irq(s);
}
static void dp8393x_reset(DeviceState *dev)
{
dp8393xState *s = DP8393X(dev);
timer_del(s->watchdog);
memset(s->regs, 0, sizeof(s->regs));
s->regs[SONIC_CR] = SONIC_CR_RST | SONIC_CR_STP | SONIC_CR_RXDIS;
s->regs[SONIC_DCR] &= ~(SONIC_DCR_EXBUS | SONIC_DCR_LBR);
s->regs[SONIC_RCR] &= ~(SONIC_RCR_LB0 | SONIC_RCR_LB1 | SONIC_RCR_BRD | SONIC_RCR_RNT);
s->regs[SONIC_TCR] |= SONIC_TCR_NCRS | SONIC_TCR_PTX;
s->regs[SONIC_TCR] &= ~SONIC_TCR_BCM;
s->regs[SONIC_IMR] = 0;
s->regs[SONIC_ISR] = 0;
s->regs[SONIC_DCR2] = 0;
s->regs[SONIC_EOBC] = 0x02F8;
s->regs[SONIC_RSC] = 0;
s->regs[SONIC_CE] = 0;
s->regs[SONIC_RSC] = 0;
/* Network cable is connected */
s->regs[SONIC_RCR] |= SONIC_RCR_CRS;
dp8393x_update_irq(s);
}
static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf,
size_t size)
{
dp8393xState *s = qemu_get_nic_opaque(nc);
uint16_t data[10];
int packet_type;
uint32_t available, address;
int width, rx_len = size;
uint32_t checksum;
width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;
s->regs[SONIC_RCR] &= ~(SONIC_RCR_PRX | SONIC_RCR_LBK | SONIC_RCR_FAER |
SONIC_RCR_CRCR | SONIC_RCR_LPKT | SONIC_RCR_BC | SONIC_RCR_MC);
packet_type = dp8393x_receive_filter(s, buf, size);
if (packet_type < 0) {
DPRINTF("packet not for netcard\n");
return -1;
}
/* XXX: Check byte ordering */
/* Check for EOL */
if (s->regs[SONIC_LLFA] & 0x1) {
/* Are we still in resource exhaustion? */
size = sizeof(uint16_t) * 1 * width;
address = dp8393x_crda(s) + sizeof(uint16_t) * 5 * width;
address_space_rw(&s->as, address, MEMTXATTRS_UNSPECIFIED,
(uint8_t *)data, size, 0);
if (data[0 * width] & 0x1) {
/* Still EOL ; stop reception */
return -1;
} else {
s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA];
}
}
/* Save current position */
s->regs[SONIC_TRBA1] = s->regs[SONIC_CRBA1];
s->regs[SONIC_TRBA0] = s->regs[SONIC_CRBA0];
/* Calculate the ethernet checksum */
checksum = cpu_to_le32(crc32(0, buf, rx_len));
/* Put packet into RBA */
DPRINTF("Receive packet at %08x\n", dp8393x_crba(s));
address = dp8393x_crba(s);
address_space_rw(&s->as, address,
MEMTXATTRS_UNSPECIFIED, (uint8_t *)buf, rx_len, 1);
address += rx_len;
address_space_rw(&s->as, address,
MEMTXATTRS_UNSPECIFIED, (uint8_t *)&checksum, 4, 1);
rx_len += 4;
s->regs[SONIC_CRBA1] = address >> 16;
s->regs[SONIC_CRBA0] = address & 0xffff;
available = dp8393x_rbwc(s);
available -= rx_len / 2;
s->regs[SONIC_RBWC1] = available >> 16;
s->regs[SONIC_RBWC0] = available & 0xffff;
/* Update status */
if (dp8393x_rbwc(s) < s->regs[SONIC_EOBC]) {
s->regs[SONIC_RCR] |= SONIC_RCR_LPKT;
}
s->regs[SONIC_RCR] |= packet_type;
s->regs[SONIC_RCR] |= SONIC_RCR_PRX;
if (s->loopback_packet) {
s->regs[SONIC_RCR] |= SONIC_RCR_LBK;
s->loopback_packet = 0;
}
/* Write status to memory */
DPRINTF("Write status at %08x\n", dp8393x_crda(s));
data[0 * width] = s->regs[SONIC_RCR]; /* status */
data[1 * width] = rx_len; /* byte count */
data[2 * width] = s->regs[SONIC_TRBA0]; /* pkt_ptr0 */
data[3 * width] = s->regs[SONIC_TRBA1]; /* pkt_ptr1 */
data[4 * width] = s->regs[SONIC_RSC]; /* seq_no */
size = sizeof(uint16_t) * 5 * width;
address_space_rw(&s->as, dp8393x_crda(s),
MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 1);
/* Move to next descriptor */
size = sizeof(uint16_t) * width;
address_space_rw(&s->as, dp8393x_crda(s) + sizeof(uint16_t) * 5 * width,
MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 0);
s->regs[SONIC_LLFA] = data[0 * width];
if (s->regs[SONIC_LLFA] & 0x1) {
/* EOL detected */
s->regs[SONIC_ISR] |= SONIC_ISR_RDE;
} else {
data[0 * width] = 0; /* in_use */
address_space_rw(&s->as, dp8393x_crda(s) + sizeof(uint16_t) * 6 * width,
MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, sizeof(uint16_t), 1);
s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA];
s->regs[SONIC_ISR] |= SONIC_ISR_PKTRX;
s->regs[SONIC_RSC] = (s->regs[SONIC_RSC] & 0xff00) | (((s->regs[SONIC_RSC] & 0x00ff) + 1) & 0x00ff);
if (s->regs[SONIC_RCR] & SONIC_RCR_LPKT) {
/* Read next RRA */
dp8393x_do_read_rra(s);
}
}
/* Done */
dp8393x_update_irq(s);
return size;
}
static void dp8393x_write(void *opaque, hwaddr addr, uint64_t data,
unsigned int size)
{
dp8393xState *s = opaque;
int reg = addr >> s->it_shift;
DPRINTF("write 0x%04x to reg %s\n", (uint16_t)data, reg_names[reg]);
switch (reg) {
/* Command register */
case SONIC_CR:
dp8393x_do_command(s, data);
break;
/* Prevent write to read-only registers */
case SONIC_CAP2:
case SONIC_CAP1:
case SONIC_CAP0:
case SONIC_SR:
case SONIC_MDT:
DPRINTF("writing to reg %d invalid\n", reg);
break;
/* Accept write to some registers only when in reset mode */
case SONIC_DCR:
if (s->regs[SONIC_CR] & SONIC_CR_RST) {
s->regs[reg] = data & 0xbfff;
} else {
DPRINTF("writing to DCR invalid\n");
}
break;
case SONIC_DCR2:
if (s->regs[SONIC_CR] & SONIC_CR_RST) {
s->regs[reg] = data & 0xf017;
} else {
DPRINTF("writing to DCR2 invalid\n");
}
break;
/* 12 lower bytes are Read Only */
case SONIC_TCR:
s->regs[reg] = data & 0xf000;
break;
/* 9 lower bytes are Read Only */
case SONIC_RCR:
s->regs[reg] = data & 0xffe0;
break;
/* Ignore most significant bit */
case SONIC_IMR:
s->regs[reg] = data & 0x7fff;
dp8393x_update_irq(s);
break;
/* Clear bits by writing 1 to them */
case SONIC_ISR:
data &= s->regs[reg];
s->regs[reg] &= ~data;
if (data & SONIC_ISR_RBE) {
dp8393x_do_read_rra(s);
}
dp8393x_update_irq(s);
if (dp8393x_can_receive(s->nic->ncs)) {
qemu_flush_queued_packets(qemu_get_queue(s->nic));
}
break;
/* Ignore least significant bit */
case SONIC_RSA:
case SONIC_REA:
case SONIC_RRP:
case SONIC_RWP:
s->regs[reg] = data & 0xfffe;
break;
/* Invert written value for some registers */
case SONIC_CRCT:
case SONIC_FAET:
case SONIC_MPT:
s->regs[reg] = data ^ 0xffff;
break;
/* All other registers have no special contrainst */
default:
s->regs[reg] = data;
}
if (reg == SONIC_WT0 || reg == SONIC_WT1) {
dp8393x_set_next_tick(s);
}
}
static void dp8393x_do_transmit_packets(dp8393xState *s)
{
NetClientState *nc = qemu_get_queue(s->nic);
uint16_t data[12];
int width, size;
int tx_len, len;
uint16_t i;
width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;
while (1) {
/* Read memory */
size = sizeof(uint16_t) * 6 * width;
s->regs[SONIC_TTDA] = s->regs[SONIC_CTDA];
DPRINTF("Transmit packet at %08x\n", dp8393x_ttda(s));
address_space_rw(&s->as,
dp8393x_ttda(s) + sizeof(uint16_t) * width,
MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 0);
tx_len = 0;
/* Update registers */
s->regs[SONIC_TCR] = data[0 * width] & 0xf000;
s->regs[SONIC_TPS] = data[1 * width];
s->regs[SONIC_TFC] = data[2 * width];
s->regs[SONIC_TSA0] = data[3 * width];
s->regs[SONIC_TSA1] = data[4 * width];
s->regs[SONIC_TFS] = data[5 * width];
/* Handle programmable interrupt */
if (s->regs[SONIC_TCR] & SONIC_TCR_PINT) {
s->regs[SONIC_ISR] |= SONIC_ISR_PINT;
} else {
s->regs[SONIC_ISR] &= ~SONIC_ISR_PINT;
}
for (i = 0; i < s->regs[SONIC_TFC]; ) {
/* Append fragment */
len = s->regs[SONIC_TFS];
if (tx_len + len > sizeof(s->tx_buffer)) {
len = sizeof(s->tx_buffer) - tx_len;
}
address_space_rw(&s->as, dp8393x_tsa(s),
MEMTXATTRS_UNSPECIFIED, &s->tx_buffer[tx_len], len, 0);
tx_len += len;
i++;
if (i != s->regs[SONIC_TFC]) {
/* Read next fragment details */
size = sizeof(uint16_t) * 3 * width;
address_space_rw(&s->as,
dp8393x_ttda(s) + sizeof(uint16_t) * (4 + 3 * i) * width,
MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 0);
s->regs[SONIC_TSA0] = data[0 * width];
s->regs[SONIC_TSA1] = data[1 * width];
s->regs[SONIC_TFS] = data[2 * width];
}
}
/* Handle Ethernet checksum */
if (!(s->regs[SONIC_TCR] & SONIC_TCR_CRCI)) {
/* Don't append FCS there, to look like slirp packets
* which don't have one */
} else {
/* Remove existing FCS */
tx_len -= 4;
}
if (s->regs[SONIC_RCR] & (SONIC_RCR_LB1 | SONIC_RCR_LB0)) {
/* Loopback */
s->regs[SONIC_TCR] |= SONIC_TCR_CRSL;
if (nc->info->can_receive(nc)) {
s->loopback_packet = 1;
nc->info->receive(nc, s->tx_buffer, tx_len);
}
} else {
/* Transmit packet */
qemu_send_packet(nc, s->tx_buffer, tx_len);
}
s->regs[SONIC_TCR] |= SONIC_TCR_PTX;
/* Write status */
data[0 * width] = s->regs[SONIC_TCR] & 0x0fff; /* status */
size = sizeof(uint16_t) * width;
address_space_rw(&s->as,
dp8393x_ttda(s),
MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 1);
if (!(s->regs[SONIC_CR] & SONIC_CR_HTX)) {
/* Read footer of packet */
size = sizeof(uint16_t) * width;
address_space_rw(&s->as,
dp8393x_ttda(s) +
sizeof(uint16_t) *
(4 + 3 * s->regs[SONIC_TFC]) * width,
MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 0);
s->regs[SONIC_CTDA] = data[0 * width] & ~0x1;
if (data[0 * width] & 0x1) {
/* EOL detected */
break;
}
}
}
/* Done */
s->regs[SONIC_CR] &= ~SONIC_CR_TXP;
s->regs[SONIC_ISR] |= SONIC_ISR_TXDN;
dp8393x_update_irq(s);
}
static void write_register(dp8393xState *s, int reg, uint16_t val)
{
DPRINTF("write 0x%04x to reg %s\n", val, reg_names[reg]);
switch (reg) {
/* Command register */
case SONIC_CR:
do_command(s, val);;
break;
/* Prevent write to read-only registers */
case SONIC_CAP2:
case SONIC_CAP1:
case SONIC_CAP0:
case SONIC_SR:
case SONIC_MDT:
DPRINTF("writing to reg %d invalid\n", reg);
break;
/* Accept write to some registers only when in reset mode */
case SONIC_DCR:
if (s->regs[SONIC_CR] & SONIC_CR_RST) {
s->regs[reg] = val & 0xbfff;
} else {
DPRINTF("writing to DCR invalid\n");
}
break;
case SONIC_DCR2:
if (s->regs[SONIC_CR] & SONIC_CR_RST) {
s->regs[reg] = val & 0xf017;
} else {
DPRINTF("writing to DCR2 invalid\n");
}
break;
/* 12 lower bytes are Read Only */
case SONIC_TCR:
s->regs[reg] = val & 0xf000;
break;
/* 9 lower bytes are Read Only */
case SONIC_RCR:
s->regs[reg] = val & 0xffe0;
break;
/* Ignore most significant bit */
case SONIC_IMR:
s->regs[reg] = val & 0x7fff;
dp8393x_update_irq(s);
break;
/* Clear bits by writing 1 to them */
case SONIC_ISR:
val &= s->regs[reg];
s->regs[reg] &= ~val;
if (val & SONIC_ISR_RBE) {
do_read_rra(s);
}
dp8393x_update_irq(s);
break;
/* Ignore least significant bit */
case SONIC_RSA:
case SONIC_REA:
case SONIC_RRP:
case SONIC_RWP:
s->regs[reg] = val & 0xfffe;
break;
/* Invert written value for some registers */
case SONIC_CRCT:
case SONIC_FAET:
case SONIC_MPT:
s->regs[reg] = val ^ 0xffff;
break;
/* All other registers have no special contrainst */
default:
s->regs[reg] = val;
}
if (reg == SONIC_WT0 || reg == SONIC_WT1) {
set_next_tick(s);
}
}