* Tony Lindgren <tony@xxxxxxxxxxx> [111007 12:11]: > This allows mapping external memory such as SRAM for use. > > This is needed for some small chunks of code, such as reprogramming > SDRAM memory source clocks that can't be executed in SDRAM. Other > use cases include some PM related code. > > Acked-by: Nicolas Pitre <nicolas.pitre@xxxxxxxxxx> > Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx> FYI this I've sent to Russell's patch system: http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=7126/1 Regards, Tony > --- > arch/arm/include/asm/io.h | 1 + > arch/arm/mm/ioremap.c | 21 +++++++++++++++++++++ > 2 files changed, 22 insertions(+), 0 deletions(-) > > diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h > index d66605d..4ff152e 100644 > --- a/arch/arm/include/asm/io.h > +++ b/arch/arm/include/asm/io.h > @@ -80,6 +80,7 @@ extern void __iomem *__arm_ioremap_caller(unsigned long, size_t, unsigned int, > > extern void __iomem *__arm_ioremap_pfn(unsigned long, unsigned long, size_t, unsigned int); > extern void __iomem *__arm_ioremap(unsigned long, size_t, unsigned int); > +extern void __iomem *__arm_ioremap_exec(unsigned long, size_t, int cached); > extern void __iounmap(volatile void __iomem *addr); > > /* > diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c > index ab50627..a2d94ac 100644 > --- a/arch/arm/mm/ioremap.c > +++ b/arch/arm/mm/ioremap.c > @@ -289,6 +289,27 @@ __arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype) > } > EXPORT_SYMBOL(__arm_ioremap); > > +/* > + * Remap an arbitrary physical address space into the kernel virtual > + * address space as memory. Needed when the kernel wants to execute > + * code in external memory. This is needed for reprogramming source > + * clocks that would affect normal memory for example. Please see > + * CONFIG_GENERIC_ALLOCATOR for allocating external memory. > + */ > +void __iomem * > +__arm_ioremap_exec(unsigned long phys_addr, size_t size, int cached) > +{ > + unsigned int mtype; > + > + if (cached) > + mtype = MT_MEMORY; > + else > + mtype = MT_MEMORY_NONCACHED; > + > + return __arm_ioremap_caller(phys_addr, size, mtype, > + __builtin_return_address(0)); > +} > + > void __iounmap(volatile void __iomem *io_addr) > { > void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr); > > -- > To unsubscribe from this list: send the line "unsubscribe linux-omap" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
