u-boot/include/phys2bus.h
Stephen Warren 927c1fa266 Create API to map between CPU physical and bus addresses
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>
2015-04-14 05:47:59 +02:00

25 lines
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C

/*
* Copyright 2015 Stephen Warren
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _BUS_ADDR_H
#define _BUS_ADDR_H
#ifdef CONFIG_PHYS_TO_BUS
unsigned long phys_to_bus(unsigned long phys);
unsigned long bus_to_phys(unsigned long bus);
#else
static inline unsigned long phys_to_bus(unsigned long phys)
{
return phys;
}
static inline unsigned long bus_to_phys(unsigned long bus)
{
return bus;
}
#endif
#endif