linux-toradex.git/arch/arm/mach-u300/timer.c, branch v3.4.67

ARM: 7205/2: sched_clock: allow sched_clock to be selected at runtime

2011-12-18T23:00:26+00:00

sched_clock() is yet another blocker on the road to the single
image. This patch implements an idea by Russell King:

http://www.spinics.net/lists/linux-omap/msg49561.html

Instead of asking the platform to implement both sched_clock()
itself and the rollover callback, simply register a read()
function, and let the ARM code care about sched_clock() itself,
the conversion to ns and the rollover. sched_clock() uses
this read() function as an indirection to the platform code.
If the platform doesn't provide a read(), the code falls back
to the jiffy counter (just like the default sched_clock).

This allow some simplifications and possibly some footprint gain
when multiple platforms are compiled in. Among the drawbacks,
the removal of the *_fixed_sched_clock optimization which could
negatively impact some platforms (sa1100, tegra, versatile
and omap).

Tested on 11MPCore, OMAP4 and Tegra.

Cc: Imre Kaloz 
Cc: Eric Miao 
Cc: Colin Cross 
Cc: Erik Gilling 
Cc: Olof Johansson 
Cc: Sascha Hauer 
Cc: Alessandro Rubini 
Cc: STEricsson 
Cc: Lennert Buytenhek 
Cc: Ben Dooks 
Tested-by: Jamie Iles 
Tested-by: Tony Lindgren 
Tested-by: Kyungmin Park 
Acked-by: Linus Walleij 
Acked-by: Nicolas Pitre 
Acked-by: Krzysztof Halasa 
Acked-by: Kukjin Kim 
Signed-off-by: Marc Zyngier 
Signed-off-by: Russell King

mach-u300: cleanup clockevent code

2011-06-23T10:09:42+00:00

Use the new clockevents_config_and_register() function to register
the U300 clockevent, since that code requires ->cpumask to be set
we set this even on this UP system to please the framework.

Cc: Thomas Gleixner 
Signed-off-by: Linus Walleij

ARM: 6947/2: mach-u300: fix compilation error in timer

2011-06-06T09:56:10+00:00

The introduction of the mmio timer accidentally referenced the
old clocksource struct which does not exist anymore. Fix this by
using a simple string instead.

Signed-off-by: Linus Walleij 
Signed-off-by: Russell King

clocksource: convert ARM 32-bit up counting clocksources

2011-05-23T17:04:51+00:00

Convert ixp4xx, lpc32xx, mxc, netx, pxa, sa1100, tcc8k, tegra and u300
to use the generic mmio clocksource recently introduced.

Cc: Imre Kaloz 
Cc: Krzysztof Halasa 
Acked-by: Eric Miao 
Acked-by: "Hans J. Koch" 
Acked-by: Colin Cross 
Cc: Erik Gilling 
Cc: Olof Johansson 
Acked-by: Linus Walleij 
Acked-by: Sascha Hauer 
Signed-off-by: Russell King

ARM: u300: convert sched_clock() to use new infrastructure

2010-12-22T22:44:47+00:00

Convert u300 to use the new sched_clock() infrastructure for extending
32bit counters to full 64-bit nanoseconds.

Acked-by: Linus Walleij 
Signed-off-by: Russell King

ARM: ensure all sched_clock() implementations are notrace marked

2010-12-22T22:44:42+00:00

ftrace requires sched_clock() to be notrace.  Ensure that all
implementations are so marked.  Also make sure that they include
linux/sched.h

Also ensure OMAP clocksource read functions are marked notrace as
they're used for sched_clock() too.

Tested-by: Santosh Shilimkar 
Tested-by: Will Deacon 
Tested-by: Mikael Pettersson 
Tested-by: Eric Miao 
Tested-by: Olof Johansson 
Signed-off-by: Russell King

ARM: U300: update clock source registration

2010-12-22T22:44:37+00:00

In d7e81c2 (clocksource: Add clocksource_register_hz/khz interface) new
interfaces were added which simplify (and optimize) the selection of the
divisor shift/mult constants.  Switch over to using this new interface.

Acked-by: Linus Walleij 
Signed-off-by: Russell King

ARM: 6297/1: move U300 timer to dynamic clock lookup

2010-08-10T21:10:56+00:00

This moves the U300 timer code to look up its clock rate from the
clock framework as is apropriate and also switches it over to use
the generic code for *calc_mult_shift() on clock source and clock
event.

Signed-off-by: Linus Walleij 
Signed-off-by: Russell King

ARM: 6296/1: clock U300 intcon and timer properly

2010-08-10T21:10:55+00:00

This removes the quirks to clock the U300 VIC and timer by custom
hooks and moves the control out to the clock framework where it
belongs. This is possible now that clocks are available early.

Signed-off-by: Linus Walleij 
Signed-off-by: Russell King

ARM: 5704/1: U300 sched_clock implementation v2

2009-09-18T21:09:02+00:00

This adds the long debated sched_clock() override for the weak
in-kernel jiffybased sched_clock(). The implementation is more or
less identical to the one used in arch/arm/plat-omap/common.c
and at last attempt to merge this the merge was postponed at the
request of Peter Zijlstra due to pending discussions regarding
generalized clocksource-based sched_clock() implementations by
adding a flag to the clocksource. However that discussion ended
up with the generic code needing to be rewritten and Paul Mundt
see no reason not to proceed with this for the time being as it
can be easily converted once the generic code is in place.

Cc: Peter Zijlstra 
Cc: Paul Mundt 
Signed-off-by: Linus Walleij 
Signed-off-by: Russell King