mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-22 01:48:52 +09:00
![Simon Glass](/assets/img/avatar_default.png)
This is defined in the asm/cache.h header file. Update this header file to include it. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Tom Rini <trini@konsulko.com> Tested-by: Adam Ford <aford173@gmail.com> #da850-evm
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_DMA_MAPPING_H
|
|
#define _LINUX_DMA_MAPPING_H
|
|
|
|
#include <asm/cache.h>
|
|
#include <linux/dma-direction.h>
|
|
#include <linux/types.h>
|
|
#include <asm/dma-mapping.h>
|
|
#include <cpu_func.h>
|
|
|
|
#define dma_mapping_error(x, y) 0
|
|
|
|
/**
|
|
* Map a buffer to make it available to the DMA device
|
|
*
|
|
* Linux-like DMA API that is intended to be used from drivers. This hides the
|
|
* underlying cache operation from drivers. Call this before starting the DMA
|
|
* transfer. In most of architectures in U-Boot, the virtual address matches to
|
|
* the physical address (but we have exceptions like sandbox). U-Boot does not
|
|
* support iommu at the driver level, so it also matches to the DMA address.
|
|
* Hence, this helper currently just performs the cache operation, then returns
|
|
* straight-mapped dma_address, which is intended to be set to the register of
|
|
* the DMA device.
|
|
*
|
|
* @vaddr: address of the buffer
|
|
* @len: length of the buffer
|
|
* @dir: the direction of DMA
|
|
*/
|
|
static inline dma_addr_t dma_map_single(void *vaddr, size_t len,
|
|
enum dma_data_direction dir)
|
|
{
|
|
unsigned long addr = (unsigned long)vaddr;
|
|
|
|
len = ALIGN(len, ARCH_DMA_MINALIGN);
|
|
|
|
if (dir == DMA_FROM_DEVICE)
|
|
invalidate_dcache_range(addr, addr + len);
|
|
else
|
|
flush_dcache_range(addr, addr + len);
|
|
|
|
return addr;
|
|
}
|
|
|
|
/**
|
|
* Unmap a buffer to make it available to CPU
|
|
*
|
|
* Linux-like DMA API that is intended to be used from drivers. This hides the
|
|
* underlying cache operation from drivers. Call this after finishin the DMA
|
|
* transfer.
|
|
*
|
|
* @addr: DMA address
|
|
* @len: length of the buffer
|
|
* @dir: the direction of DMA
|
|
*/
|
|
static inline void dma_unmap_single(dma_addr_t addr, size_t len,
|
|
enum dma_data_direction dir)
|
|
{
|
|
len = ALIGN(len, ARCH_DMA_MINALIGN);
|
|
|
|
if (dir != DMA_TO_DEVICE)
|
|
invalidate_dcache_range(addr, addr + len);
|
|
}
|
|
|
|
#endif
|