linux.git/include/asm-mips/time.h, branch v2.6.24

[MIPS] Only build r4k clocksource for systems that work ok with it.

2007-11-26T17:26:14+00:00

In particular as-is it's not suited for multicore and mutiprocessors
systems where there is on guarantee that the counter are synchronized
or running from the same clock at all.  This broke Sibyte and probably
others since the "[MIPS] Handle R4000/R4400 mfc0 from count register."
commit.

Signed-off-by: Ralf Baechle

[MIPS] Handle R4000/R4400 mfc0 from count register.

2007-11-26T17:26:14+00:00

The R4000 and R4400 have an errata where if the cp0 count register is read
in the exact moment when it matches the compare register no interrupt will
be generated.

This bug may be triggered if the cp0 count register is being used as
clocksource and the compare interrupt as clockevent.  So a simple
workaround is to avoid using the compare for both facilities on the
affected CPUs.

This is different from the workaround suggested in the old errata documents;
at some opportunity probably the official version should be implemented
and tested.  Another thing to find out is which processor versions
exactly are affected.  I only have errata documents upto R4400 V3.0
available so for the moment the code treats all R4000 and R4400 as broken.

This is potencially a problem for some machines that have no other decent
clocksource available; this workaround will cause them to fall back to
another clocksource, worst case the "jiffies" source.

[MIPS] time: Code cleanups

2007-11-02T16:13:46+00:00

* Do not include unnecessary headers.
* Do not mention time.README.
* Do not mention mips_timer_ack.
* Make clocksource_mips static.  It is now dedicated to c0_timer.
* Initialize clocksource_mips.read statically.
* Remove null_hpt_read.
* Remove an argument of plat_timer_setup.  It is just a placeholder.

Signed-off-by: Atsushi Nemoto 
Signed-off-by: Ralf Baechle

[MIPS] time: Remove now unused local_timer_interrupt.

2007-11-02T16:13:46+00:00

Signed-off-by: Ralf Baechle

[MIPS] time: Replace plat_timer_setup with modern APIs.

2007-10-29T19:35:36+00:00

plat_timer_setup is no longer getting called.

Signed-off-by: Ralf Baechle

[MIPS] time: Remove declaration of plat_timer_setup, there is no caller.

2007-10-29T19:35:34+00:00

Signed-off-by: Ralf Baechle

[MIPS] time: Helpers to compute clocksource/event shift and mult values.

2007-10-19T17:15:57+00:00

Signed-off-by: Ralf Baechle

[MIPS] time: Move R4000 clockevent device code to separate configurable file

2007-10-18T17:11:47+00:00

Signed-off-by: Ralf Baechle

[MIPS] time: Delete dead cycles_per_jiffy, mips_timer_ack and null_timer_ack

2007-10-18T17:11:47+00:00

cycles_per_jiffy was only ever getting assigned and the function pointer
not being called anymore and mips_timer_ack had gotten similarly stale.  I
leave the remaining assignments unfixed as a lighthouse pointing platform
maintainers to what needs a rewrite.  These changes make null_timer_ack()
unreferenced, so delete that too.

Signed-off-by: Ralf Baechle

[MIPS] Implement clockevents for R4000-style cp0 count/compare interrupt

2007-10-11T22:46:09+00:00

Signed-off-by: Ralf Baechle