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smc91c96 updates (a2osx w/ lancegs)

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1. m_loopback_result needs to be a signed into so negative status codes remain negative.
2. FDSE bit was masked out
3. when full duplex switched internet is active, deferrals and collisions not used
4. implement AUTO_RELEASE
This commit is contained in:
Kelvin Sherlock 2021-08-02 21:15:48 -04:00
parent d68363cf84
commit 827f0a3232
2 changed files with 16 additions and 8 deletions
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22
src/devices/machine/smc91c9x.cpp
View File

@ -153,7 +153,7 @@ void smc91c9x_device::device_reset()
m_rx_active = 0;
m_tx_retry_count = 0;
m_reg[B0_TCR] = 0x0000; m_regmask[B0_TCR] = 0x3d87;
m_reg[B0_TCR] = 0x0000; m_regmask[B0_TCR] = 0xbd87;
m_reg[B0_EPH_STATUS] = 0x4000; m_regmask[B0_EPH_STATUS] = 0x0000;
m_reg[B0_RCR] = 0x0000; m_regmask[B0_RCR] = 0xc307;
m_reg[B0_COUNTER] = 0x0000; m_regmask[B0_COUNTER] = 0x0000;
@ -406,7 +406,7 @@ int smc91c9x_device::recv_start_cb(u8 *buf, int length)
}
// Check for active transmission
if (m_tx_active)
if (m_tx_active && !(m_reg[B0_TCR] & FDSE))
{
// TODO: Update collision counters
LOGMASKED(LOG_RX, "transmit active COLLISION, rx packet length %d discarded\n", length);
@ -527,7 +527,7 @@ void smc91c9x_device::recv_complete_cb(int result)
TIMER_CALLBACK_MEMBER(smc91c9x_device::tx_poll)
{
// Check for active RX and delay if necessary
if (m_rx_active)
if (m_rx_active && !(m_reg[B0_TCR] & FDSE))
{
// TODO: Implement correct CSMA/CD algorithm
m_tx_poll->adjust(attotime::from_usec(40));
@ -659,11 +659,19 @@ void smc91c9x_device::send_complete_cb(int result)
m_reg[B2_INTERRUPT] |= EINT_EPH;
}
// Update status in the transmit word
*(u16*)&tx_buffer[0] = m_reg[B0_EPH_STATUS];
if (m_reg[B1_CONTROL] & AUTO_RELEASE)
{
alloc_release(packet_num);
}
else
{
// Update status in the transmit word
*(u16*)&tx_buffer[0] = m_reg[B0_EPH_STATUS];
// Push the packet number onto the tx completion fifo
push_completed_tx(packet_num);
}
// Push the packet number onto the tx completion fifo
push_completed_tx(packet_num);
update_ethernet_irq();

2
src/devices/machine/smc91c9x.h
View File

@ -258,7 +258,7 @@ private:
int m_rx_active;
int m_tx_retry_count;
u8 m_rx_hash;
u8 m_loopback_result;
int m_loopback_result;
void update_ethernet_irq();
void update_stats();