Commit cfd57099 authored Oct 01, 2010 by David Daney Committed by Ralf Baechle Oct 29, 2010

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>

parent f1299072

arch/mips/include/asm/dma.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -91,7 +91,10 @@
		#define MAX_DMA_ADDRESS (PAGE_OFFSET + 0x01000000)
		#endif
		#define MAX_DMA_PFN PFN_DOWN(virt_to_phys((void *)MAX_DMA_ADDRESS))

		#ifndef MAX_DMA32_PFN
		#define MAX_DMA32_PFN (1UL << (32 - PAGE_SHIFT))
		#endif

		/* 8237 DMA controllers */
		#define IO_DMA1_BASE 0x00 /* 8 bit slave DMA, channels 0..3 */