u-boot/include/phys2bus.h

/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Copyright 2015 Stephen Warren
 */

#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
SPDX: Convert all of our single license tags to Linux Kernel style When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com> 7 years ago			`/* SPDX-License-Identifier: GPL-2.0+ */`
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> 10 years ago			`/*`
			`* Copyright 2015 Stephen Warren`
			`*/`

			`#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`