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Commit be135f40 authored by Anton Blanchard's avatar Anton Blanchard Committed by Benjamin Herrenschmidt
Browse files

powerpc: Add ioremap_wc 



Add ioremap_wc so drivers can request write combining on kernel
mappings.

Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent f5f0307f

arch/powerpc/include/asm/io.h

+5 −0
Original line number Diff line number Diff line
@@ -2,6 +2,8 @@ 
#define _ASM_POWERPC_IO_H

#ifdef __KERNEL__



#define ARCH_HAS_IOREMAP_WC



/*

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License
@@ -628,6 +630,8 @@ static inline void iosync(void) 
 *

 * * ioremap_nocache is identical to ioremap

 *

 * * ioremap_wc enables write combining

 *

 * * iounmap undoes such a mapping and can be hooked

 *

 * * __ioremap_at (and the pending __iounmap_at) are low level functions to
@@ -648,6 +652,7 @@ static inline void iosync(void) 
extern void __iomem *ioremap(phys_addr_t address, unsigned long size);

extern void __iomem *ioremap_flags(phys_addr_t address, unsigned long size,

				   unsigned long flags);

extern void __iomem *ioremap_wc(phys_addr_t address, unsigned long size);

#define ioremap_nocache(addr, size)	ioremap((addr), (size))

#define ioremap_prot(addr, size, prot)	ioremap_flags((addr), (size), (prot))

arch/powerpc/mm/pgtable_32.c

+8 −0
Original line number Diff line number Diff line
@@ -132,6 +132,14 @@ ioremap(phys_addr_t addr, unsigned long size) 
}

EXPORT_SYMBOL(ioremap);



void __iomem *

ioremap_wc(phys_addr_t addr, unsigned long size)

{

	return __ioremap_caller(addr, size, _PAGE_NO_CACHE,

				__builtin_return_address(0));

}

EXPORT_SYMBOL(ioremap_wc);



void __iomem *

ioremap_flags(phys_addr_t addr, unsigned long size, unsigned long flags)

{

arch/powerpc/mm/pgtable_64.c

+11 −0
Original line number Diff line number Diff line
@@ -255,6 +255,16 @@ void __iomem * ioremap(phys_addr_t addr, unsigned long size) 
	return __ioremap_caller(addr, size, flags, caller);

}



void __iomem * ioremap_wc(phys_addr_t addr, unsigned long size)

{

	unsigned long flags = _PAGE_NO_CACHE;

	void *caller = __builtin_return_address(0);



	if (ppc_md.ioremap)

		return ppc_md.ioremap(addr, size, flags, caller);

	return __ioremap_caller(addr, size, flags, caller);

}



void __iomem * ioremap_flags(phys_addr_t addr, unsigned long size,

			     unsigned long flags)

{
@@ -311,6 +321,7 @@ void iounmap(volatile void __iomem *token) 
}



EXPORT_SYMBOL(ioremap);

EXPORT_SYMBOL(ioremap_wc);

EXPORT_SYMBOL(ioremap_flags);

EXPORT_SYMBOL(__ioremap);

EXPORT_SYMBOL(__ioremap_at);