[RFC 3/9] MIPS: add virt_to_phys() and phys_to_virt()
s.hauer at pengutronix.de
Thu Sep 3 23:20:48 PDT 2015
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
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