From 175add1981e53d22caba8f42d5f924a4de507b6c Mon Sep 17 00:00:00 2001 From: John Keller Date: Mon, 24 Nov 2008 16:47:17 -0600 Subject: [IA64] SN specific version of dma_get_required_mask() Create a platform specific version of dma_get_required_mask() for ia64 SN Altix. All SN Altix platforms support 64 bit DMA addressing regardless of the size of system memory. Create an ia64 machvec for dma_get_required_mask, with the SN version unconditionally returning DMA_64BIT_MASK. Signed-off-by: John Keller Signed-off-by: Tony Luck --- arch/ia64/pci/pci.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'arch/ia64/pci') diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c index 211fcfd115f..61f1af5c23c 100644 --- a/arch/ia64/pci/pci.c +++ b/arch/ia64/pci/pci.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include @@ -748,6 +749,32 @@ static void __init set_pci_cacheline_size(void) pci_cache_line_size = (1 << cci.pcci_line_size) / 4; } +u64 ia64_dma_get_required_mask(struct device *dev) +{ + u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); + u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); + u64 mask; + + if (!high_totalram) { + /* convert to mask just covering totalram */ + low_totalram = (1 << (fls(low_totalram) - 1)); + low_totalram += low_totalram - 1; + mask = low_totalram; + } else { + high_totalram = (1 << (fls(high_totalram) - 1)); + high_totalram += high_totalram - 1; + mask = (((u64)high_totalram) << 32) + 0xffffffff; + } + return mask; +} +EXPORT_SYMBOL_GPL(ia64_dma_get_required_mask); + +u64 dma_get_required_mask(struct device *dev) +{ + return platform_dma_get_required_mask(dev); +} +EXPORT_SYMBOL_GPL(dma_get_required_mask); + static int __init pcibios_init(void) { set_pci_cacheline_size(); -- cgit v1.2.3