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[IA64] SN specific version of dma_get_required_mask()

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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 <jpk@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
John Keller
2008-11-24 16:47:17 -06:00
committed by Tony Luck
parent a6a3bb5c88
commit 175add1981
7 changed files with 49 additions and 5 deletions
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27
arch/ia64/pci/pci.c
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@@ -19,6 +19,7 @@
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/bootmem.h>
#include <asm/machvec.h>
#include <asm/page.h>
@@ -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();