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CVS commit: src/sys/dev/pci/voyager

Module Name:    src
Committed By:   macallan
Date:           Tue Dec 13 14:39:37 UTC 2011

Modified Files:
        src/sys/dev/pci/voyager: files.voyager
Added Files:
        src/sys/dev/pci/voyager: pwmclock.c

Log Message:
an alternative clock implementation for Loongson2F and SM502, mostly
This supports Loongson2F frequency scaling. The problem is that Gdium has
no CPU clock independent high resolution timer we can use as a timecounter
so we use one of the SM502's PWMs to generate a 100Hz timer interrupt, use
the cp0 counter to measure time and adjust for frequency changes.
Other Loongson-based machines will need something similar but hopefully
less hackish.

To generate a diff of this commit:
cvs rdiff -u -r1.1 -r1.2 src/sys/dev/pci/voyager/files.voyager
cvs rdiff -u -r0 -r1.1 src/sys/dev/pci/voyager/pwmclock.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

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