From: David Daney <ddaney@caviumnetworks.com>
Date: Fri, 1 Oct 2010 20:27:28 +0000 (-0700)
Subject: MIPS: Allow MAX_DMA32_PFN to be overridden.
X-Git-Tag: firefly_0821_release~7613^2~3561^2~39
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=cfd570990f863de90a86da73ef7b7d84e5190647;p=firefly-linux-kernel-4.4.55.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>
---

diff --git a/arch/mips/include/asm/dma.h b/arch/mips/include/asm/dma.h
index 1353c81065d1..2d47da62d5a7 100644
--- a/arch/mips/include/asm/dma.h
+++ b/arch/mips/include/asm/dma.h
@@ -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 */