[v4,10/18] arm64: Implement ioremap_np() to map MMIO as nGnRnE

Commit Message

Hector Martin April 2, 2021, 9:05 a.m. UTC

This is used on Apple ARM platforms, which require most MMIO
(except PCI devices) to be mapped as nGnRnE.

Acked-by: Marc Zyngier <[e-mail]>
Acked-by: Will Deacon <[e-mail]>
Signed-off-by: Hector Martin <[e-mail]>
---
 arch/arm64/include/asm/io.h | 1 +
 1 file changed, 1 insertion(+)

Patch

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.