mirror of https://gitee.com/openkylin/linux.git
MIPS: Allow MAX_DMA32_PFN to be overridden.
DMA mapping may reduce the usable physical address range usable for 32-bit DMA. Signed-off-by: David Daney <ddaney@caviumnetworks.com> Patchwork: http://patchwork.linux-mips.org/patch/1633/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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@ -91,7 +91,10 @@
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#define MAX_DMA_ADDRESS (PAGE_OFFSET + 0x01000000)
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#endif
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#define MAX_DMA_PFN PFN_DOWN(virt_to_phys((void *)MAX_DMA_ADDRESS))
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#ifndef MAX_DMA32_PFN
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#define MAX_DMA32_PFN (1UL << (32 - PAGE_SHIFT))
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#endif
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/* 8237 DMA controllers */
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#define IO_DMA1_BASE 0x00 /* 8 bit slave DMA, channels 0..3 */
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