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authorChristophe Leroy <christophe.leroy@c-s.fr>2018-10-09 13:51:33 +0000
committerMichael Ellerman <mpe@ellerman.id.au>2018-10-13 22:21:25 +1100
commit86c391bd5f47101acf1f3e0abd9fe0616ae2a4fb (patch)
tree7fd0801b74451e47227947f6e6ba92b40018a917 /arch/powerpc/include/asm/io.h
parentdfd718a2ed1f678e66749ffe41bdeafedf3f4314 (diff)
downloadlinux-86c391bd5f47101acf1f3e0abd9fe0616ae2a4fb.tar.bz2
powerpc/32: Add ioremap_wt() and ioremap_coherent()
Other arches have ioremap_wt() to map IO areas write-through. Implement it on PPC as well in order to avoid drivers using __ioremap(_PAGE_WRITETHRU) Also implement ioremap_coherent() to avoid drivers using __ioremap(_PAGE_COHERENT) Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/io.h')
-rw-r--r--arch/powerpc/include/asm/io.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h
index e0331e754568..cdccab3938db 100644
--- a/arch/powerpc/include/asm/io.h
+++ b/arch/powerpc/include/asm/io.h
@@ -3,6 +3,9 @@
#ifdef __KERNEL__
#define ARCH_HAS_IOREMAP_WC
+#ifdef CONFIG_PPC32
+#define ARCH_HAS_IOREMAP_WT
+#endif
/*
* This program is free software; you can redistribute it and/or
@@ -746,6 +749,10 @@ static inline void iosync(void)
*
* * ioremap_wc enables write combining
*
+ * * ioremap_wt enables write through
+ *
+ * * ioremap_coherent maps coherent cached memory
+ *
* * iounmap undoes such a mapping and can be hooked
*
* * __ioremap_at (and the pending __iounmap_at) are low level functions to
@@ -767,6 +774,8 @@ extern void __iomem *ioremap(phys_addr_t address, unsigned long size);
extern void __iomem *ioremap_prot(phys_addr_t address, unsigned long size,
unsigned long flags);
extern void __iomem *ioremap_wc(phys_addr_t address, unsigned long size);
+void __iomem *ioremap_wt(phys_addr_t address, unsigned long size);
+void __iomem *ioremap_coherent(phys_addr_t address, unsigned long size);
#define ioremap_nocache(addr, size) ioremap((addr), (size))
#define ioremap_uc(addr, size) ioremap((addr), (size))
#define ioremap_cache(addr, size) \