ce4100: Add errata fixes for UART on CE4100

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This patch enables the UART on the CE4100. The UART has a couple of
issues that need to be worked around. First the UART is mostly PC
compatible except that it is clocked eight times faster than a
standard PC so the default configuration provided in
arch/x86/include/asm/serial.h needs to be overridden. Second the TX
interrupt may not be set correctly all the time. Lastly accessing the
UART via I/O space for early_prink() hangs the chip when the IOAPIC is
enabled.

A custom mem_serial_in() is provided to work around the TX interrupt
issue. The configuration issues are dealt with in the call back
registered with the 8250 driver via serial8250_set_isa_configurator()

Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
LKML-Reference: <1290436128-17958-1-git-send-email-dirk.brandewie@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

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Dirk Brandewie 2010-11-22 06:28:48 -08:00 • committed by Thomas Gleixner

parent 9cdca86972

commit 5ec6960f6f

1 changed files with 92 additions and 2 deletions

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arch/x86/platform/ce4100/ce4100.c

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