Reception is managed via Interrupt Service Routines (ISR) or DMA:
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To understand the driver, you must first understand the hardware. The 16C95X (including models like the 16C950, 16C952, and 16C954) is an advanced UART standard developed to succeed older standards like the 16C550 and 16C750.
You will typically encounter this driver if you have added a or PCI-Express (PCIe) serial expansion card to a desktop or industrial computer. Reception is managed via Interrupt Service Routines (ISR)
| Symptom | Likely Cause | Fix | |---------|--------------|-----| | Tx stops after first byte | THRE interrupt not re-enabled | Check start_tx() enables IER_THRI | | Rx overrun errors | Rx FIFO threshold too high | Lower TLR value or increase CPU responsiveness | | Spurious CTS/RTS changes | Auto flow control misconfigured | Verify EFR bits and MCR_AFE | | Baud rate off by factor 2 | Forgot DLAB=1 when setting divisor | Re-check initialization order |
Before examining the driver, one must understand the hardware enhancements over the 16550: The 16C95X (including models like the 16C950, 16C952,
Further reading: