1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * DMA implementation for Hexagon
4 *
5 * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
6 */
7
8#include <linux/dma-map-ops.h>
9#include <linux/memblock.h>
10#include <asm/page.h>
11
12void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
13		enum dma_data_direction dir)
14{
15	void *addr = phys_to_virt(paddr);
16
17	switch (dir) {
18	case DMA_TO_DEVICE:
19		hexagon_clean_dcache_range((unsigned long) addr,
20		(unsigned long) addr + size);
21		break;
22	case DMA_FROM_DEVICE:
23		hexagon_inv_dcache_range((unsigned long) addr,
24		(unsigned long) addr + size);
25		break;
26	case DMA_BIDIRECTIONAL:
27		flush_dcache_range((unsigned long) addr,
28		(unsigned long) addr + size);
29		break;
30	default:
31		BUG();
32	}
33}
34
35/*
36 * Our max_low_pfn should have been backed off by 16MB in mm/init.c to create
37 * DMA coherent space.  Use that for the pool.
38 */
39static int __init hexagon_dma_init(void)
40{
41	return dma_init_global_coherent(PFN_PHYS(max_low_pfn),
42					hexagon_coherent_pool_size);
43}
44core_initcall(hexagon_dma_init);
45