powerpc: Add ioremap_wc
Add ioremap_wc so drivers can request write combining on kernel mappings. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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@ -2,6 +2,8 @@
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#define _ASM_POWERPC_IO_H
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#ifdef __KERNEL__
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#define ARCH_HAS_IOREMAP_WC
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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@ -628,6 +630,8 @@ static inline void iosync(void)
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*
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* * ioremap_nocache is identical to ioremap
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*
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* * ioremap_wc enables write combining
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*
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* * iounmap undoes such a mapping and can be hooked
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*
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* * __ioremap_at (and the pending __iounmap_at) are low level functions to
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@ -648,6 +652,7 @@ static inline void iosync(void)
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extern void __iomem *ioremap(phys_addr_t address, unsigned long size);
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extern void __iomem *ioremap_flags(phys_addr_t address, unsigned long size,
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unsigned long flags);
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extern void __iomem *ioremap_wc(phys_addr_t address, unsigned long size);
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#define ioremap_nocache(addr, size) ioremap((addr), (size))
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#define ioremap_prot(addr, size, prot) ioremap_flags((addr), (size), (prot))
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@ -132,6 +132,14 @@ ioremap(phys_addr_t addr, unsigned long size)
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}
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EXPORT_SYMBOL(ioremap);
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void __iomem *
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ioremap_wc(phys_addr_t addr, unsigned long size)
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{
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return __ioremap_caller(addr, size, _PAGE_NO_CACHE,
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__builtin_return_address(0));
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}
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EXPORT_SYMBOL(ioremap_wc);
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void __iomem *
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ioremap_flags(phys_addr_t addr, unsigned long size, unsigned long flags)
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{
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@ -255,6 +255,16 @@ void __iomem * ioremap(phys_addr_t addr, unsigned long size)
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return __ioremap_caller(addr, size, flags, caller);
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}
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void __iomem * ioremap_wc(phys_addr_t addr, unsigned long size)
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{
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unsigned long flags = _PAGE_NO_CACHE;
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void *caller = __builtin_return_address(0);
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if (ppc_md.ioremap)
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return ppc_md.ioremap(addr, size, flags, caller);
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return __ioremap_caller(addr, size, flags, caller);
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}
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void __iomem * ioremap_flags(phys_addr_t addr, unsigned long size,
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unsigned long flags)
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{
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@ -311,6 +321,7 @@ void iounmap(volatile void __iomem *token)
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}
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EXPORT_SYMBOL(ioremap);
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EXPORT_SYMBOL(ioremap_wc);
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EXPORT_SYMBOL(ioremap_flags);
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EXPORT_SYMBOL(__ioremap);
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EXPORT_SYMBOL(__ioremap_at);
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