Normally kmalloc() returns things that are DMA safe so not visible on all
platforms but we do need to explicitly request DMA safe memory.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

Otherwise we won't run correctly on systems that require this for larger
data transfers.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

For simplicity always run the DSP at the SYSCLK rate.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

Turn off the ADSP memory when we aren't using it, saving a small amount of
power.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

Some compiler versions complain.
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

Some ADSP devices can make use of DVFS to optimise power consumption
depending on the operating frequency of the DSP core. Implement
support for this in the generic ADSP code.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

Many current Wolfson devices feature DSPs based around an architecture
known as ADSP.  Since there is a lot of commonality in the system
integration of these devices a common library will be used to provide
support for them.

This version provides equivalent support for ADSP1 to that currently
included in the WM2200 driver.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>