diff options
Diffstat (limited to 'arch/arm/mach-footbridge')
| -rw-r--r-- | arch/arm/mach-footbridge/common.c | 22 | ||||
| -rw-r--r-- | arch/arm/mach-footbridge/include/mach/memory.h | 15 |
2 files changed, 28 insertions, 9 deletions
diff --git a/arch/arm/mach-footbridge/common.c b/arch/arm/mach-footbridge/common.c index b97f529e58e..41febc796b1 100644 --- a/arch/arm/mach-footbridge/common.c +++ b/arch/arm/mach-footbridge/common.c @@ -201,6 +201,11 @@ void __init footbridge_map_io(void) #ifdef CONFIG_FOOTBRIDGE_ADDIN +static inline unsigned long fb_bus_sdram_offset(void) +{ + return *CSR_PCISDRAMBASE & 0xfffffff0; +} + /* * These two functions convert virtual addresses to PCI addresses and PCI * addresses to virtual addresses. Note that it is only legal to use these @@ -210,14 +215,13 @@ unsigned long __virt_to_bus(unsigned long res) { WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory); - return (res - PAGE_OFFSET) + (*CSR_PCISDRAMBASE & 0xfffffff0); + return res + (fb_bus_sdram_offset() - PAGE_OFFSET); } EXPORT_SYMBOL(__virt_to_bus); unsigned long __bus_to_virt(unsigned long res) { - res -= (*CSR_PCISDRAMBASE & 0xfffffff0); - res += PAGE_OFFSET; + res = res - (fb_bus_sdram_offset() - PAGE_OFFSET); WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory); @@ -225,4 +229,16 @@ unsigned long __bus_to_virt(unsigned long res) } EXPORT_SYMBOL(__bus_to_virt); +unsigned long __pfn_to_bus(unsigned long pfn) +{ + return __pfn_to_phys(pfn) + (fb_bus_sdram_offset() - PHYS_OFFSET)); +} +EXPORT_SYMBOL(__pfn_to_bus); + +unsigned long __bus_to_pfn(unsigned long bus) +{ + return __phys_to_pfn(bus - (fb_bus_sdram_offset() - PHYS_OFFSET)); +} +EXPORT_SYMBOL(__bus_to_pfn); + #endif diff --git a/arch/arm/mach-footbridge/include/mach/memory.h b/arch/arm/mach-footbridge/include/mach/memory.h index cb16e59d87b..8d64f457408 100644 --- a/arch/arm/mach-footbridge/include/mach/memory.h +++ b/arch/arm/mach-footbridge/include/mach/memory.h @@ -29,6 +29,8 @@ #ifndef __ASSEMBLY__ extern unsigned long __virt_to_bus(unsigned long); extern unsigned long __bus_to_virt(unsigned long); +extern unsigned long __pfn_to_bus(unsigned long); +extern unsigned long __bus_to_pfn(unsigned long); #endif #define __virt_to_bus __virt_to_bus #define __bus_to_virt __bus_to_virt @@ -36,14 +38,15 @@ extern unsigned long __bus_to_virt(unsigned long); #elif defined(CONFIG_FOOTBRIDGE_HOST) /* - * The footbridge is programmed to expose the system RAM at the corresponding - * address. So, if PAGE_OFFSET is 0xc0000000, RAM appears at 0xe0000000. - * If 0x80000000, then its exposed at 0xa0000000 on the bus. etc. - * The only requirement is that the RAM isn't placed at bus address 0 which + * The footbridge is programmed to expose the system RAM at 0xe0000000. + * The requirement is that the RAM isn't placed at bus address 0, which * would clash with VGA cards. */ -#define __virt_to_bus(x) ((x) - 0xe0000000) -#define __bus_to_virt(x) ((x) + 0xe0000000) +#define BUS_OFFSET 0xe0000000 +#define __virt_to_bus(x) ((x) + (BUS_OFFSET - PAGE_OFFSET)) +#define __bus_to_virt(x) ((x) - (BUS_OFFSET - PAGE_OFFSET)) +#define __pfn_to_bus(x) (__pfn_to_phys(x) + (BUS_OFFSET - PHYS_OFFSET)) +#define __bus_to_pfn(x) __phys_to_pfn((x) - (BUS_OFFSET - PHYS_OFFSET)) #else |