diff options
Diffstat (limited to 'arch/x86/include/asm/io.h')
| -rw-r--r-- | arch/x86/include/asm/io.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h index 919e3b19f3ca..f150b1ecf920 100644 --- a/arch/x86/include/asm/io.h +++ b/arch/x86/include/asm/io.h @@ -138,6 +138,37 @@ static inline void *phys_to_virt(phys_addr_t address) #define virt_to_bus virt_to_phys #define bus_to_virt phys_to_virt +/** + * ioremap - map bus memory into CPU space + * @offset: bus address of the memory + * @size: size of the resource to map + * + * ioremap performs a platform specific sequence of operations to + * make bus memory CPU accessible via the readb/readw/readl/writeb/ + * writew/writel functions and the other mmio helpers. The returned + * address is not guaranteed to be usable directly as a virtual + * address. + * + * If the area you are trying to map is a PCI BAR you should have a + * look at pci_iomap(). + */ +extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size); +extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size); +extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size, + unsigned long prot_val); + +/* + * The default ioremap() behavior is non-cached: + */ +static inline void __iomem *ioremap(resource_size_t offset, unsigned long size) +{ + return ioremap_nocache(offset, size); +} + +extern void iounmap(volatile void __iomem *addr); + +extern void __iomem *fix_ioremap(unsigned idx, unsigned long phys); + #ifdef CONFIG_X86_32 # include "io_32.h" |