mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-02 17:41:08 +00:00
7e812f2e9c
This function return cache-line aligned allocation which is mapped to uncached io region. Signed-off-by: Thomas Chou <thomas@wytron.com.tw> Signed-off-by: Scott McNutt <smcnutt@psyent.com>
23 lines
734 B
C
23 lines
734 B
C
#ifndef __ASM_NIOS2_DMA_MAPPING_H
|
|
#define __ASM_NIOS2_DMA_MAPPING_H
|
|
|
|
/* dma_alloc_coherent() return cache-line aligned allocation which is mapped
|
|
* to uncached io region.
|
|
*
|
|
* IO_REGION_BASE should be defined in board config header file
|
|
* 0x80000000 for nommu, 0xe0000000 for mmu
|
|
*/
|
|
|
|
static inline void *dma_alloc_coherent(size_t len, unsigned long *handle)
|
|
{
|
|
void *addr = malloc(len + CONFIG_SYS_DCACHELINE_SIZE);
|
|
if (!addr)
|
|
return 0;
|
|
flush_dcache((unsigned long)addr, len + CONFIG_SYS_DCACHELINE_SIZE);
|
|
*handle = ((unsigned long)addr +
|
|
(CONFIG_SYS_DCACHELINE_SIZE - 1)) &
|
|
~(CONFIG_SYS_DCACHELINE_SIZE - 1) & ~(IO_REGION_BASE);
|
|
return (void *)(*handle | IO_REGION_BASE);
|
|
}
|
|
|
|
#endif /* __ASM_NIOS2_DMA_MAPPING_H */
|