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authorVineet Gupta <vgupta@synopsys.com>2013-01-22 12:23:57 +0100
committerVineet Gupta <vgupta@synopsys.com>2013-02-15 18:46:15 +0100
commitfc7943d29e9f6f5f6d4b111120b66ec86501673e (patch)
tree04a0c556489438b9c25613345bc1a25cef38819b /arch/arc/plat-arcfpga
parentARC: [Review] Multi-platform image #5: NR_IRQS defined by ARC core (diff)
downloadlinux-fc7943d29e9f6f5f6d4b111120b66ec86501673e.tar.xz
linux-fc7943d29e9f6f5f6d4b111120b66ec86501673e.zip
ARC: [Review] Multi-platform image #6: cpu-to-dma-addr optional
All the current platforms can work with 0x8000_0000 based dma_addr_t since the Bus Bridges typically ignore the top bit (the only excpetion was Angel4 PCI-AHB bridge which we no longer care for). That way we don't need plat-specific cpu-addr to bus-addr conversion. Hooks still provided - just in case a platform has an obscure device which say needs 0 based bus address. That way <asm/dma_mapping.h> no longer needs to unconditinally include <plat/dma_addr.h> Also verfied that on Angel4 board, other peripherals (IDE-disk / EMAC) work fine with 0x8000_0000 based dma addresses. Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Arnd Bergmann <arnd@arndb.de> Acked-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arc/plat-arcfpga')
-rw-r--r--arch/arc/plat-arcfpga/include/plat/dma_addr.h45
1 files changed, 0 insertions, 45 deletions
diff --git a/arch/arc/plat-arcfpga/include/plat/dma_addr.h b/arch/arc/plat-arcfpga/include/plat/dma_addr.h
deleted file mode 100644
index 0e963431b729..000000000000
--- a/arch/arc/plat-arcfpga/include/plat/dma_addr.h
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * vineetg: Feb 2009
- * -For AA4 board, kernel to DMA address APIs
- */
-
-/*
- * kernel addresses are 0x800_000 based, while Bus addr are 0 based
- */
-
-#ifndef __PLAT_DMA_ADDR_H
-#define __PLAT_DMA_ADDR_H
-
-#include <linux/device.h>
-
-static inline unsigned long plat_dma_addr_to_kernel(struct device *dev,
- dma_addr_t dma_addr)
-{
- return dma_addr + PAGE_OFFSET;
-}
-
-static inline dma_addr_t plat_kernel_addr_to_dma(struct device *dev, void *ptr)
-{
- unsigned long addr = (unsigned long)ptr;
- /*
- * To Catch buggy drivers which can call DMA map API with kernel vaddr
- * i.e. for buffers alloc via vmalloc or ioremap which are not
- * gaurnateed to be PHY contiguous and hence unfit for DMA anyways.
- * On ARC kernel virtual address is 0x7000_0000 to 0x7FFF_FFFF, so
- * ideally we want to check this range here, but our implementation is
- * better as it checks for even worse user virtual address as well.
- */
- if (likely(addr >= PAGE_OFFSET))
- return addr - PAGE_OFFSET;
-
- BUG();
- return addr;
-}
-
-#endif