1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *  Based on linux/arch/arm/mm/dma-mapping.c
4 *
5 *  Copyright (C) 2000-2004 Russell King
6 */
7
8#include <linux/dma-map-ops.h>
9#include <asm/cachetype.h>
10#include <asm/cacheflush.h>
11#include <asm/outercache.h>
12#include <asm/cp15.h>
13
14#include "dma.h"
15
16void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
17		enum dma_data_direction dir)
18{
19	dmac_map_area(__va(paddr), size, dir);
20
21	if (dir == DMA_FROM_DEVICE)
22		outer_inv_range(paddr, paddr + size);
23	else
24		outer_clean_range(paddr, paddr + size);
25}
26
27void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
28		enum dma_data_direction dir)
29{
30	if (dir != DMA_TO_DEVICE) {
31		outer_inv_range(paddr, paddr + size);
32		dmac_unmap_area(__va(paddr), size, dir);
33	}
34}
35
36void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
37			bool coherent)
38{
39	if (IS_ENABLED(CONFIG_CPU_V7M)) {
40		/*
41		 * Cache support for v7m is optional, so can be treated as
42		 * coherent if no cache has been detected. Note that it is not
43		 * enough to check if MPU is in use or not since in absense of
44		 * MPU system memory map is used.
45		 */
46		dev->dma_coherent = cacheid ? coherent : true;
47	} else {
48		/*
49		 * Assume coherent DMA in case MMU/MPU has not been set up.
50		 */
51		dev->dma_coherent = (get_cr() & CR_M) ? coherent : true;
52	}
53}
54