45 lines
1.0 KiB
C
45 lines
1.0 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
/*
|
||
|
|
* DMA implementation for Hexagon
|
||
|
|
*
|
||
|
|
* Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/dma-map-ops.h>
|
||
|
|
#include <linux/memblock.h>
|
||
|
|
#include <asm/page.h>
|
||
|
|
|
||
|
|
void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
|
||
|
|
enum dma_data_direction dir)
|
||
|
|
{
|
||
|
|
void *addr = phys_to_virt(paddr);
|
||
|
|
|
||
|
|
switch (dir) {
|
||
|
|
case DMA_TO_DEVICE:
|
||
|
|
hexagon_clean_dcache_range((unsigned long) addr,
|
||
|
|
(unsigned long) addr + size);
|
||
|
|
break;
|
||
|
|
case DMA_FROM_DEVICE:
|
||
|
|
hexagon_inv_dcache_range((unsigned long) addr,
|
||
|
|
(unsigned long) addr + size);
|
||
|
|
break;
|
||
|
|
case DMA_BIDIRECTIONAL:
|
||
|
|
flush_dcache_range((unsigned long) addr,
|
||
|
|
(unsigned long) addr + size);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
BUG();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Our max_low_pfn should have been backed off by 16MB in mm/init.c to create
|
||
|
|
* DMA coherent space. Use that for the pool.
|
||
|
|
*/
|
||
|
|
static int __init hexagon_dma_init(void)
|
||
|
|
{
|
||
|
|
return dma_init_global_coherent(PFN_PHYS(max_low_pfn),
|
||
|
|
hexagon_coherent_pool_size);
|
||
|
|
}
|
||
|
|
core_initcall(hexagon_dma_init);
|