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am79c90: minor fixes (nw)

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* corrected transmit buffer minimum length check
* don't reset on stop if already set
* additional logging
This commit is contained in:
Patrick Mackinlay 2018-12-18 11:57:52 +07:00
parent 13511f8503
commit 82c91f7777
1 changed files with 10 additions and 4 deletions
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14
src/devices/machine/am79c90.cpp
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@ -286,6 +286,8 @@ void am7990_device_base::recv_complete_cb(int result)
// update the final descriptor
u32 const ring_address = (m_rx_ring_base + (m_rx_ring_pos << 3)) & RING_ADDR_MASK;
LOGMASKED(LOG_RXTX, "receive complete rmd1 0x%04x rmd3 %d\n", m_rx_md[1], result & RMD3_MCNT);
m_dma_out_cb(ring_address | 2, m_rx_md[1]);
m_dma_out_cb(ring_address | 6, result & RMD3_MCNT);
@ -387,7 +389,7 @@ void am7990_device_base::transmit()
}
// minimum length 100 when chaining, or 64 when not, except in loopback mode
if (!length && !(m_mode & MODE_LOOP) && tx_buf_length < ((m_tx_md[1] & TMD1_ENP) ? 64 : 100))
if (!length && !(m_mode & MODE_LOOP) && tx_buf_length < ((m_tx_md[1] & TMD1_ENP) ? (append_fcs ? 60 : 64) : 100))
logerror("first transmit buffer length %d less than required minimum\n", tx_buf_length);
// read the data from memory
@ -496,15 +498,19 @@ void am7990_device_base::send_complete_cb(int result)
case -1: // forced collision
m_tx_md[1] |= TMD1_ERR;
m_dma_out_cb(ring_address | 6, m_tx_md[3] | TMD3_RTRY);
m_tx_md[3] |= TMD3_RTRY;
m_dma_out_cb(ring_address | 6, m_tx_md[3]);
break;
case 0: // failure to transmit (assume loss of carrier)
m_tx_md[1] |= TMD1_ERR;
m_dma_out_cb(ring_address | 6, m_tx_md[3] | TMD3_LCAR);
m_tx_md[3] |= TMD3_LCAR;
m_dma_out_cb(ring_address | 6, m_tx_md[3]);
break;
}
LOGMASKED(LOG_RXTX, "transmit complete tmd1 0x%04x tmd3 0x%04x\n", m_tx_md[1], m_tx_md[3]);
// update the last descriptor
m_dma_out_cb(ring_address | 2, m_tx_md[1]);
@ -556,7 +562,7 @@ WRITE16_MEMBER(am7990_device_base::regs_w)
// STOP takes priority over all other bits
if (data & CSR0_STOP)
{
if ((type() == AM7990) || !(m_csr[0] & CSR0_STOP))
if (!(m_csr[0] & CSR0_STOP))
device_reset();
break;
}