| Message ID | 20210304213902.83903-12-marcan@marcan.st |
|---|---|
| State | New |
| Headers | show |
| Series | Apple M1 SoC platform bring-up | expand |
On Thu, 04 Mar 2021 21:38:46 +0000, Hector Martin <marcan@marcan.st> wrote: > > This is used on Apple ARM platforms, which require most MMIO > (except PCI devices) to be mapped as nGnRnE. > > Signed-off-by: Hector Martin <marcan@marcan.st> Acked-by: Marc Zyngier <maz@kernel.org> M.
On Fri, Mar 05, 2021 at 06:38:46AM +0900, Hector Martin wrote: > This is used on Apple ARM platforms, which require most MMIO > (except PCI devices) to be mapped as nGnRnE. > > Signed-off-by: Hector Martin <marcan@marcan.st> > --- > arch/arm64/include/asm/io.h | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h > index 5ea8656a2030..953b8703af60 100644 > --- a/arch/arm64/include/asm/io.h > +++ b/arch/arm64/include/asm/io.h > @@ -169,6 +169,7 @@ extern void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size); > > #define ioremap(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE)) > #define ioremap_wc(addr, size) __ioremap((addr), (size), __pgprot(PROT_NORMAL_NC)) > +#define ioremap_np(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRnE)) Probably worth noting that whether or not this actually results in a non-posted mapping depends on the system architecture, but this is the best we can do, so: Acked-by: Will Deacon <will@kernel.org> I would personally prefer that drivers didn't have to care about this, and ioremap on arm64 figured out the right attributes based on the region being mapped, but I haven't followed the discussion closely so I won't die on that hill. Will
diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h index 5ea8656a2030..953b8703af60 100644 --- a/arch/arm64/include/asm/io.h +++ b/arch/arm64/include/asm/io.h @@ -169,6 +169,7 @@ extern void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size); #define ioremap(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE)) #define ioremap_wc(addr, size) __ioremap((addr), (size), __pgprot(PROT_NORMAL_NC)) +#define ioremap_np(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRnE)) /* * PCI configuration space mapping function.
This is used on Apple ARM platforms, which require most MMIO (except PCI devices) to be mapped as nGnRnE. Signed-off-by: Hector Martin <marcan@marcan.st> --- arch/arm64/include/asm/io.h | 1 + 1 file changed, 1 insertion(+)