diff options
Diffstat (limited to 'arch/arc/mm/ioremap.c')
| -rw-r--r-- | arch/arc/mm/ioremap.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/arch/arc/mm/ioremap.c b/arch/arc/mm/ioremap.c index 75b0ca6e387e..49b8abd1115c 100644 --- a/arch/arc/mm/ioremap.c +++ b/arch/arc/mm/ioremap.c @@ -14,6 +14,18 @@ #include <linux/slab.h> #include <linux/cache.h> +static inline bool arc_uncached_addr_space(phys_addr_t paddr) +{ + if (is_isa_arcompact()) { + if (paddr >= ARC_UNCACHED_ADDR_SPACE) + return true; + } else if (paddr >= perip_base && paddr <= 0xFFFFFFFF) { + return true; + } + + return false; +} + void __iomem *ioremap(phys_addr_t paddr, unsigned long size) { phys_addr_t end; @@ -27,7 +39,7 @@ void __iomem *ioremap(phys_addr_t paddr, unsigned long size) * If the region is h/w uncached, MMU mapping can be elided as optim * The cast to u32 is fine as this region can only be inside 4GB */ - if (paddr >= ARC_UNCACHED_ADDR_SPACE) + if (arc_uncached_addr_space(paddr)) return (void __iomem *)(u32)paddr; return ioremap_prot(paddr, size, PAGE_KERNEL_NO_CACHE); @@ -85,7 +97,8 @@ EXPORT_SYMBOL(ioremap_prot); void iounmap(const void __iomem *addr) { - if (addr >= (void __force __iomem *)ARC_UNCACHED_ADDR_SPACE) + /* weird double cast to handle phys_addr_t > 32 bits */ + if (arc_uncached_addr_space((phys_addr_t)(u32)addr)) return; vfree((void *)(PAGE_MASK & (unsigned long __force)addr)); |