There is a possibility of a loop happening in the PLL output clock
chain on the S3C64XX series. clk_mpll's parent was set to be
clk_mout_mpll, but this is fed from clk_fout_epll (which is also
clk_mpll).

clk_mpll is meant to be the output from the MPLL, and clk_mout_mpll
is a seperate clock derived from the mux of clk_mpll and clk_fin_mpll
and thus should be considered a seperate clock.

Anything using clk_mpll directly really should not be relying on this
being the clock that is eventually routed to a peripheral, so remove the
loop and ensure that the clocks accurately represent the clock chain
in the device.

The clk_mpll is not being used outside of the s3c6400-clock.c code, so
this change should not break anything else.

Do the same for the EPLL.
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

The current code assumes that the external clock mux will be set to
the crystal. Set this up explicitly within the clock API.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

In s3c64xx_roundrate_clksrc function, the calculation is wrong. This
patch fixes this calculation.
Signed-off-by: NThomas Abraham <thomas.ab@samsung.com>
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

This ensures the clock hierarchy data structures are updated when we
change the clock source in the actual hardware registers.
Signed-off-by: NThomas Abraham <thomas.ab@samsung.com>
[ben-linux@fluff.org: Minor re-indentation of subject]
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

In s3c64xx_setrate_clksrc() we used sclk->shift, but actually need to
use sclk->divider_shift to correctly calculate the value for the divider
register.
Signed-off-by: NThomas Abraham <thomas.ab@samsung.com>
[ben-linux@fluff.org: Minor re-indentation of description]
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

The value of armclk_mask needs to be inverted for use as a mask on
the register value when updating ARM_RATIO.

This is critical for cpufreq support, without it attempts to scale
the frequency of the core trash pretty much the entire clock tree.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

If the requested clock is faster than the parent clock then the
parent clock is the closest we can get to the request so we need
to return that instead of the requested clock.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

Add ARM clock to provide 'arm' from the APLL to the ARM core.
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

Add doubled HCLK to S3C64xx.
Signed-off-by: NWerner Almesberger <werner@openmoko.org>
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

Add camera interface clock to S3C6410.
Signed-off-by: NWerner Almesberger <werner@openmoko.org>
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

Some of the rate selection logic in s3c64xx_setrate_clksrc uses what
appears to be parent clock selection logic. This patch corrects it.

I also added a check for overly large dividers to prevent them from
changing unrelated clocks.
Signed-off-by: NWerner Almesberger <werner@openmoko.org>
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

Fix the following sparse warnings in s3c6400-clock.c:

39:12: warning: symbol 'clk_ext_xtal_mux' was not declared. Should it be static?
66:12: warning: symbol 'clk_fout_apll' was not declared. Should it be static?
81:19: warning: symbol 'clk_mout_apll' was not declared. Should it be static?
91:12: warning: symbol 'clk_fout_epll' was not declared. Should it be static?
106:19: warning: symbol 'clk_mout_epll' was not declared. Should it be static?
126:19: warning: symbol 'clk_mout_mpll' was not declared. Should it be static?
148:12: warning: symbol 'clk_dout_mpll' was not declared. Should it be static?
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

The clock list for the USB host bus clock was in the wrong order,
move clk_48m to position 0.
Signed-off-by: NBen Dooks <ben@simtec.co.uk>
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

The usb-host-bus clock should be named usb-bus-host.
Signed-off-by: NBen Dooks <ben@simtec.co.uk>
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

The clk_fout_epll clock wasn't registered as part of the initial clock
work, which can cause problems if it is used by one of the hardware
blocks.
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

Some of the startup output can be reduced to
KERN_DEBUG from KERN_INFO as it is only really
useful when trying to debug kernel initialisation
problems.
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

Add the PLL clock initialisation and clock registration
and include the clocks sourced via CLKDIVx for most of
the on-chip peripherals.
Signed-off-by: NBen Dooks <ben-linux@fluff.org>