mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
44 lines
1.0 KiB
44 lines
1.0 KiB
// 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);
|
|
|