mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-25 14:10:43 +00:00
927c1fa266
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>
25 lines
421 B
C
25 lines
421 B
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
|