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x86: Geode Multi-Function General Purpose Timers support

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This adds support for Multi-Function General Purpose Timers.  It detects the
available timers during southbridge init, and provides an API for allocating
and setting the timers.  They're higher resolution than the standard PIT, so
the MFGPTs come in handy for quite a few things.

Note that we never clobber the timers that the BIOS might have opted to use;
we just check for unused timers.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: Andres Salomon <dilinger@debian.org>
Cc: Andi Kleen <ak@suse.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Andres Salomon
2007-10-12 23:04:06 +02:00
committed by Thomas Gleixner
parent 5fa3a246ea
commit 83d7384f8d
5 changed files with 255 additions and 1 deletions
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4
arch/x86/kernel/geode_32.c
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@@ -145,10 +145,14 @@ EXPORT_SYMBOL_GPL(geode_gpio_setup_event);
static int __init geode_southbridge_init(void)
{
int timers;
if (!is_geode())
return -ENODEV;
init_lbars();
timers = geode_mfgpt_detect();
printk(KERN_INFO "geode: %d MFGPT timers available.\n", timers);
return 0;
}