diff options
| -rw-r--r-- | drivers/Kconfig | 8 | ||||
| -rw-r--r-- | include/phys2bus.h | 25 |
2 files changed, 33 insertions, 0 deletions
diff --git a/drivers/Kconfig b/drivers/Kconfig index dcce532e2d..941aa0c261 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -53,3 +53,11 @@ source "drivers/crypto/Kconfig" source "drivers/thermal/Kconfig" endmenu + +config PHYS_TO_BUS + bool + help + Some SoCs use a different address map for CPU physical addresses and + peripheral DMA master accesses. If yours does, select this option in + your platform's Kconfig, and implement the appropriate mapping + functions in your platform's support code. diff --git a/include/phys2bus.h b/include/phys2bus.h new file mode 100644 index 0000000000..87b6d69aa6 --- /dev/null +++ b/include/phys2bus.h @@ -0,0 +1,25 @@ +/* + * 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 |