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b5ee900258
Let's provide an overridable default instead of having every machine class define __virt_to_bus and __bus_to_virt to the same thing. What most platforms are using is bus_addr == phys_addr so such is the default. One exception is ebsa110 which has no DMA what so ever, so the actual definition is not important except only for proper compilation. Also added a comment about the special footbridge bus translation. Let's also remove comments alluding to set_dma_addr which is not (and should not) be commonly used. Signed-off-by: Nicolas Pitre <nico@marvell.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
36 lines
903 B
C
36 lines
903 B
C
/*
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* arch/arm/mach-ixp23xx/include/mach/memory.h
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*
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* Copyright (c) 2003-2004 Intel Corp.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#ifndef __ASM_ARCH_MEMORY_H
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#define __ASM_ARCH_MEMORY_H
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#include <mach/hardware.h>
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/*
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* Physical DRAM offset.
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*/
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#define PHYS_OFFSET (0x00000000)
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#define __virt_to_bus(v) \
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({ unsigned int ret; \
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ret = ((__virt_to_phys(v) - 0x00000000) + \
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(*((volatile int *)IXP23XX_PCI_SDRAM_BAR) & 0xfffffff0)); \
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ret; })
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#define __bus_to_virt(b) \
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({ unsigned int data; \
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data = *((volatile int *)IXP23XX_PCI_SDRAM_BAR); \
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__phys_to_virt((((b - (data & 0xfffffff0)) + 0x00000000))); })
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#define arch_is_coherent() 1
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#endif
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