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On some SoCs, DMA-capable peripherals see a different address space to the CPU's physical address space. Create an API to allow platform-agnostic drivers to convert between the two address spaces when programming DMA operations. This API will exist on all platforms, but will have a dummy implementation when this feature is not required. Other platforms will enable CONFIG_PHYS_TO_BUS and provide the required implementation. Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
26 lines
421 B
C
26 lines
421 B
C
/*
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* Copyright 2015 Stephen Warren
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _BUS_ADDR_H
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#define _BUS_ADDR_H
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#ifdef CONFIG_PHYS_TO_BUS
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unsigned long phys_to_bus(unsigned long phys);
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unsigned long bus_to_phys(unsigned long bus);
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#else
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static inline unsigned long phys_to_bus(unsigned long phys)
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{
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return phys;
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}
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static inline unsigned long bus_to_phys(unsigned long bus)
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{
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return bus;
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}
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#endif
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#endif
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