[U-Boot] [PATCH] arc: add stubs for map_physmem() and unmap_physmem()

[Alexey Brodkin <Alexey.Brodkin@synopsys.com>]

Hi Simon,

On Fri, 2015-11-13 at 11:14 -0700, Simon Glass wrote:
> Hi Alexey,
> 
> On 12 November 2015 at 14:56, Alexey Brodkin
> <Alexey.Brodkin@synopsys.com> wrote:
> > Up until now there was no need in those stubs.
> > 
> > But since following commit compilation of U-Boot on ARC is broken:
> > ------------------------>8----------------------
> > commit 7861204c9af7fec1ea9b41541c272516235a6c93
> > Author: Stephen Warren <swarren@wwwdotorg.org>
> > Date:   Sat Oct 3 13:56:46 2015 -0600
> > 
> >     itest: make memory access work under sandbox
> > 
> >     itest accesses memory, and hence must map/unmap it. Without doing so, it
> >     accesses invalid addresses and crashes.
> > 
> >     Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
> >     Reviewed-by: Simon Glass <sjg@chromium.org>
> > ------------------------>8----------------------
> > 
> > That's because CMD_ITEST is enabled by default in common/Kconfig and now
> > map_physmem()/unmap_physmem() is used there.
> > 
> > So this patch adds missing stubs for ARC.
> > 
> > Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
> > Cc: Stephen Warren <swarren@wwwdotorg.org>
> > Cc: Simon Glass <sjg@chromium.org>
> > ---
> >  arch/arc/include/asm/io.h | 24 ++++++++++++++++++++++++
> >  1 file changed, 24 insertions(+)
> > 
> > diff --git a/arch/arc/include/asm/io.h b/arch/arc/include/asm/io.h
> > index 24b7337..281682c 100644
> > --- a/arch/arc/include/asm/io.h
> > +++ b/arch/arc/include/asm/io.h
> > @@ -10,6 +10,30 @@
> >  #include <linux/types.h>
> >  #include <asm/byteorder.h>
> > 
> > +/*
> > + * Given a physical address and a length, return a virtual address
> > + * that can be used to access the memory range with the caching
> > + * properties specified by "flags".
> > + */
> > +#define MAP_NOCACHE    (0)
> > +#define MAP_WRCOMBINE  (0)
> > +#define MAP_WRBACK     (0)
> > +#define MAP_WRTHROUGH  (0)
> > +
> > +static inline void *
> > +map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
> > +{
> > +       return (void *)((unsigned long)paddr);
> > +}
> > +
> > +/*
> > + * Take down a mapping set up by map_physmem().
> > + */
> > +static inline void unmap_physmem(void *vaddr, unsigned long flags)
> > +{
> > +
> > +}
> > +
> >  static inline void sync(void)
> >  {
> >         /* Not yet implemented */
> > --
> > 2.4.3
> > 
> 
> What error does this solve?
---------------------->8-------------------
  CC      common/cmd_itest.o
common/cmd_itest.c: In function 'evalexp':
common/cmd_itest.c:61:3: warning: implicit
declaration of function 'map_physmem' [-Wimplicit-function-declaration]
   buf = map_physmem(addr, w, MAP_WRBACK);
   ^
com
mon/cmd_itest.c:61:30: error: 'MAP_WRBACK' undeclared (first use in this function)
   buf = map_physmem(addr, w,
MAP_WRBACK);
                              ^
common/cmd_itest.c:61:30: note: each undeclared identifier is reported only
once for each function it appears in
common/cmd_itest.c:71:3: warning: implicit declaration of function 'unmap_physmem' [
-Wimplicit-function-declaration]
   unmap_physmem(buf, w);
   ^
scripts/Makefile.build:277: recipe for target
'common/cmd_itest.o' failed
make[1]: *** [common/cmd_itest.o] Error 1
Makefile:1211: recipe for target 'common' failed
make
: *** [common] Error 2
---------------------->8-------------------

> Is CONFIG_ARCH_MAP_SYSMEM defined for arc?

No
---------------------->8-------------------
$ cat .config | grep CONFIG_ARCH_MAP_SYSMEM---------------------->8-------------------

-Alexey