[RFC 3/9] MIPS: add virt_to_phys() and phys_to_virt()

[Sascha Hauer]

On Fri, Aug 28, 2015 at 06:46:14PM +0300, Antony Pavlov wrote:
> On Fri, 28 Aug 2015 08:34:32 +0200
> Sascha Hauer <s.hauer at pengutronix.de> wrote:
> 
> > On Fri, Aug 28, 2015 at 01:24:04AM +0300, Antony Pavlov wrote:
> > > N.B. phys_to_virt() translates phys address
> > > to KSEG1 (uncached) address as barebox mips
> > > has no cache support.
> > 
> > What would it take to implement cache support for mips?
> lack of the cache support is critical problem for current barebox mips support.
> I'm planning to add cache support in several weeks.
> This task needs much test efforts for different boards.
> 
> Anyway I can't carry out cache adding work at one.
> But adding virt_to_phys and DMA support will help to add cache support one day anyway.

Looking at this again the virt_to_phys/phys_to_virt macros are not
necessary. dma_alloc_coherent() already returns both the virtual address
and the DMA address. It should be possible to replace DMA_ADDRESS_BROKEN
in the ehci driver with a real pointer and use it appropriatly in the
driver.

Sascha


-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |