diff options
Diffstat (limited to 'include/asm-mips/io.h')
| -rw-r--r-- | include/asm-mips/io.h | 31 |
1 files changed, 29 insertions, 2 deletions
diff --git a/include/asm-mips/io.h b/include/asm-mips/io.h index 3b4d97d8064..42f80782acd 100644 --- a/include/asm-mips/io.h +++ b/include/asm-mips/io.h @@ -27,6 +27,7 @@ #include <asm/processor.h> #include <asm/string.h> +#include <ioremap.h> #include <mangle-port.h> /* @@ -209,6 +210,8 @@ extern void __iounmap(volatile void __iomem *addr); static inline void __iomem * __ioremap_mode(phys_t offset, unsigned long size, unsigned long flags) { +#define __IS_LOW512(addr) (!((phys_t)(addr) & (phys_t) ~0x1fffffffULL)) + if (cpu_has_64bit_addresses) { u64 base = UNCAC_BASE; @@ -219,9 +222,29 @@ static inline void __iomem * __ioremap_mode(phys_t offset, unsigned long size, if (flags == _CACHE_UNCACHED) base = (u64) IO_BASE; return (void __iomem *) (unsigned long) (base + offset); + } else if (__builtin_constant_p(offset) && + __builtin_constant_p(size) && __builtin_constant_p(flags)) { + phys_t phys_addr, last_addr; + + phys_addr = fixup_bigphys_addr(offset, size); + + /* Don't allow wraparound or zero size. */ + last_addr = phys_addr + size - 1; + if (!size || last_addr < phys_addr) + return NULL; + + /* + * Map uncached objects in the low 512MB of address + * space using KSEG1. + */ + if (__IS_LOW512(phys_addr) && __IS_LOW512(last_addr) && + flags == _CACHE_UNCACHED) + return (void __iomem *)CKSEG1ADDR(phys_addr); } return __ioremap(offset, size, flags); + +#undef __IS_LOW512 } /* @@ -273,12 +296,16 @@ static inline void __iomem * __ioremap_mode(phys_t offset, unsigned long size, static inline void iounmap(volatile void __iomem *addr) { - if (cpu_has_64bit_addresses) +#define __IS_KSEG1(addr) (((unsigned long)(addr) & ~0x1fffffffUL) == CKSEG1) + + if (cpu_has_64bit_addresses || + (__builtin_constant_p(addr) && __IS_KSEG1(addr))) return; __iounmap(addr); -} +#undef __IS_KSEG1 +} #define __BUILD_MEMORY_SINGLE(pfx, bwlq, type, irq) \ \ |