Commit Graph

36 Commits

Author SHA1 Message Date
Paul Mundt
253b0887b3 sh: clkfwk: Rework legacy CPG clock handling.
This moves out the old legacy CPG clocks to their own file, and converts
over the existing users. With these clocks going away and each CPU
dealing with them on their own, CPUs can gradually move over to the new
interface.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-13 17:38:11 +09:00
Paul Mundt
100890c55e sh: clkfwk: Provide a generic clk_set_rate_ex() path for root clocks.
In the case of root clocks (such as clkin oscillators, extal, etc.), the
rate information is entirely platform dependent and needs to be lazily
set and propagated from the platform code. This provides a method for
establishing the rate update on these types of clocks that define no
set_rate() op of their own.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-13 17:05:51 +09:00
Paul Mundt
d672fef027 sh: clkfwk: Handle NULL clkops for root clocks.
root clocks may simply be placeholders for rate and ancestry information,
and have no real associated operations of their own. Account for this,
so we are still able to use these sorts of clocks for rate propagation.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-13 17:03:09 +09:00
Paul Mundt
af777ce42d sh: clkfwk: module_clk -> peripheral_clk rename.
For consistenct naming, and to allow us to fix up some confusion in the
SH-Mobile clock framework, amongst other places.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-13 16:59:40 +09:00
Paul Mundt
fd5b12458b Merge branch 'master' into sh/clkfwk 2009-05-12 19:54:36 +09:00
Paul Mundt
8be5f1a68f sh: Kill off the remnants of the old timer code.
Now with all of the TMU users moved over to the new TMU driver, and the
old TMU driver killed off, the left-over infrastructure can go along
with it.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-12 19:53:55 +09:00
Paul Mundt
9fe5ee0efb sh: clkfwk: Use arch_clk_init() for on-chip clock registration.
CPUs registering on-chip clocks should be using arch_clk_init() with the
new scheme so that the CPUs have the opportunity to establish the
topology prior to the initial root clock rate propagation. This ensures
that CPUs with on-chip clocks that use CLK_ENABLE_ON_INIT are properly
enabled at the initial propagation time, without having to further poke
the root clocks.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-12 19:29:04 +09:00
Paul Mundt
f3f8290cb3 sh: clkfwk: Handle clk_get_sys() returning an ERR_PTR.
clk_get() needs to also perform an IS_ERR() check to see whether
clk_get_sys() failed or not.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-12 16:07:40 +09:00
Paul Mundt
0dae89572c sh: clkfwk: Wire up clk_get_sys() support.
This stubs in clk_get_sys() from the ARM clkdev implementation.
Tentatively conver the clk_get() lookup code to use this, and once the
rest of the in-tree users are happy with this, it can replace the
fallback lookups.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-12 06:18:09 +09:00
Paul Mundt
007e8363b6 sh: clkfwk: Kill off clk_recalc_rate().
The only user for this is the SH-Mobile r_clk, which is now added as a
root clock and can be kicked via propagate_rate() as usual. Given that,
there is no longer any need for the special clk_recalc_rate(), so we kill
it off.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-12 06:05:32 +09:00
Paul Mundt
aa87aa343f sh: clkfwk: Improve the generic clk_set_parent() implementation.
This causes the generic clk_set_parent() implementation to be a bit more
intelligent. A clk_reparent() is added to move the clock over to the new
parent's sibling list, which then allows the generic rate propagation
code to succeed. This also becomes a nop if the new and old parents are
unchanged.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-12 05:51:05 +09:00
Paul Mundt
ae891a4264 sh: clkfwk: Fix up the clk_enable() error path.
There are a couple of instances where a clk_enable() can fail, which the
SH-Mobile code presently handles, but doesn't get reported all the way
back up. This fixes up the return type so the errors make it all the way
down to the drivers.

Additionally, we now also error out properly if the parent enable fails.
Prep work for aggressively turning off unused clocks on boot.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-12 05:30:10 +09:00
Paul Mundt
4ff29ff8e8 sh: clkfwk: Consolidate the ALWAYS_ENABLED / NEEDS_INIT mess.
There is no real distinction here in behaviour, either a clock needs to
be enabled on initialiation or not. The ALWAYS_ENABLED flag was always
intended to only apply to clocks that were physically always on and could
simply not be disabled at all from software. Unfortunately over time this
was abused and the meaning became a bit blurry.

So, we kill off both of all of those paths now, as well as the newer
NEEDS_INIT flag, and consolidate on a CLK_ENABLE_ON_INIT. Clocks that
need to be enabled on initialization can set this, and it will purposely
enable them and bump the refcount up.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-12 05:14:53 +09:00
Paul Mundt
b1f6cfe48c sh: clkfwk: refactor rate propagation.
This resyncs the rate propagation strategy with the scheme used by the
OMAP clock framework. Child clocks are tracked on a list under each
parent and propagation happens there specifically rather than constantly
iterating over the global clock list.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-12 04:27:43 +09:00
Paul Mundt
a02cb230bb sh: clkfwk: Add a followparent_recalc() helper.
This adds a followparent_recalc() helper for clocks that just follow the
parent's rate. Switch over the few CPUs that use this scheme for some of
their clocks.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-12 03:50:44 +09:00
Paul Mundt
b68d820143 sh: clkfwk: Make recalc return an unsigned long.
This is prep work for cleaning up some of the rate propagation bits.
Trivial conversion.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-12 03:45:08 +09:00
Magnus Damm
4f5ecaa054 sh: clock framework update, fix count and kill off kref
This patch updates the clock framework use count code.
With this patch the enable() and disable() callbacks
only get called when counting from and to zero.
While at it the kref stuff gets replaced with an int.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-08 17:46:22 +09:00
Magnus Damm
b3cacf3181 sh: call clock framework init() callback once
Make sure that clk->ops->init() only gets called once in
the case of CLK_ALWAYS_ENABLED. Without this patch the
init() callback may be called multiple times.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-08 11:38:28 +09:00
Francesco VIRLINZI
50cca715a6 sh: clkfwk: Safer resume from hibernation.
This patch fixes a possible problem in the resume from
hibenration. It temporaneally saves the clk->rate on the
stack to avoid any possible change during the clk->set_parent(..)
call.

Signed-off-by: Francesco Virlinzi <francesco.virlinzi@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-03-16 20:11:00 +09:00
Francesco VIRLINZI
4a55026fd7 sh: clkfwk: Add resume from hibernation support.
This patch adds PM support to the clock framework.
With this, resume from hibernation is properly supported.

Signed-off-by: Francesco Virlinzi <francesco.virlinzi@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-03-11 17:18:50 +09:00
Francesco VIRLINZI
d680c76ecc sh: clkfwk: add clk_set_parent/clk_get_parent
This patch adds the clk_set_parent/clk_get_parent routines to the sh
clock framework.

Signed-off-by: Francesco Virlinzi <francesco.virlinzi@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-03-11 17:18:46 +09:00
Paul Mundt
00e825c6b9 sh: Fix clock framework compiler warnings.
CC      arch/sh/kernel/cpu/clock.o
  arch/sh/kernel/cpu/clock.c: In function 'clk_disable':
  arch/sh/kernel/cpu/clock.c:156: warning: 'return' with a value, in function returning void

Introduced by ("sh: enable and disable clocks recursively").

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-12-22 18:42:53 +09:00
Magnus Damm
d12cfac146 sh: enable and disable clocks recursively
Recurse and make sure parent clocks get enabled/disabled.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-12-22 18:42:50 +09:00
Paul Mundt
fa43972fab sh: fixup many sparse errors.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-09-08 10:35:04 +09:00
Magnus Damm
152fe36ebe sh: Show all clocks and their state in /proc/clocks
Show all clocks in /proc/clocks, and also show if they are enabled or
disabled. This is useful to show MSTPCR bits on SuperH Mobile processors.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-07-28 18:10:36 +09:00
Adrian Bunk
4c1cfab1e0 sh/kernel/ cleanups
This patch contains the following cleanups:
- make the following needlessly global code static:
  - cf-enabler.c: cf_init()
  - cpu/clock.c: __clk_enable()
  - cpu/clock.c: __clk_disable()
  - process_32.c: default_idle()
  - time_32.c: struct clocksource_sh
  - timers/timer-tmu.c: struct tmu_timer_ops
- remove the following unused functions (no CONFIG_BLK_DEV_FD on sh):
  - process_{32,64}.c: disable_hlt()
  - process_{32,64}.c: enable_hlt()

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-07-28 18:10:30 +09:00
Stuart Menefy
24eb17e081 sh: clkfwk: Support multi-level clock propagation.
Currently clock propagation only works for one level, but we have some
clocks which need to propagate multiple levels, so make this recursive.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:51:52 +09:00
Paul Mundt
f6991b0456 sh: Implement clk_round_rate() in the clock framework.
This is an optional component of the clock framework. However,
as we're going to be using this in the cpufreq drivers, add
support for it to the framework.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-07-20 13:29:09 +09:00
dmitry pervushin
dfbbbe9295 sh: Fix clock multiplier on SH7722.
This fixes up the master clock multiplier and initial rate
propagation for the SH7722 clocks.

Signed-off-by: dmitry pervushin <dimka@nomadgs.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-05-21 14:34:45 +09:00
Paul Mundt
db62e5bd29 sh: Move clock reporting to its own proc entry.
Previously this was done in cpuinfo, but with the number of clocks
growing, it makes more sense to place this in a different proc entry.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-05-07 02:11:56 +00:00
dmitry pervushin
1929cb340b sh: SH7722 clock framework support.
This adds support for the SH7722 (MobileR) to the clock framework.

Signed-off-by: dmitry pervushin <dimka@nomadgs.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-05-07 02:11:56 +00:00
Paul Mundt
1d118562c2 sh: Clock framework tidying.
This syncs up the SH clock framework with the linux/clk.h API,
for which there were only some minor changes required, namely
the clk_get() dev_id and subsequent callsites.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2006-12-06 10:45:40 +09:00
Paul Mundt
237b98f61d sh: sem2mutex conversion for clock framework.
Simple sem2mutex conversion.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2006-09-27 17:28:20 +09:00
Paul Mundt
e4c2cfee5d sh: Various cosmetic cleanups.
We had quite a bit of whitespace damage, clean most of it up..

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Arthur Othieno <a.othieno@bluewin.ch>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2006-09-27 12:31:01 +09:00
Paul Mundt
134ed1420e [PATCH] sh: Make peripheral clock frequency setting mandatory
Pretty much every subtype does this now anyways, and as we depend on it in a
few places being set to something sensible quite early on, it's better for a
new subtype to simply set a sensible default.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-02-01 08:53:19 -08:00
Paul Mundt
36ddf31b68 [PATCH] sh: Simplistic clock framework
This adds a relatively simplistic clock framework for sh.  The initial goal
behind this is to clean up the arch/sh/kernel/time.c mess and to get the CPU
subtype-specific frequency setting and calculation code moved somewhere more
sensible.

This only deals with the core clocks at the moment, though it's trivial for
other drivers to define their own clocks as desired.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Cc: john stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-16 23:15:28 -08:00