1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
4 #include <linux/cache.h>
5 #include <linux/dma-map-ops.h>
6 #include <linux/genalloc.h>
7 #include <linux/highmem.h>
10 #include <linux/scatterlist.h>
11 #include <linux/types.h>
12 #include <asm/cache.h>
14 static inline void cache_op(phys_addr_t paddr, size_t size,
15 void (*fn)(unsigned long start, unsigned long end))
17 struct page *page = phys_to_page(paddr);
18 void *start = __va(page_to_phys(page));
19 unsigned long offset = offset_in_page(paddr);
25 if (offset + len > PAGE_SIZE)
26 len = PAGE_SIZE - offset;
28 if (PageHighMem(page)) {
29 start = kmap_atomic(page);
31 fn((unsigned long)start + offset,
32 (unsigned long)start + offset + len);
36 fn((unsigned long)start + offset,
37 (unsigned long)start + offset + len);
47 static void dma_wbinv_set_zero_range(unsigned long start, unsigned long end)
49 memset((void *)start, 0, end - start);
50 dma_wbinv_range(start, end);
53 void arch_dma_prep_coherent(struct page *page, size_t size)
55 cache_op(page_to_phys(page), size, dma_wbinv_set_zero_range);
58 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
59 enum dma_data_direction dir)
63 cache_op(paddr, size, dma_wb_range);
66 case DMA_BIDIRECTIONAL:
67 cache_op(paddr, size, dma_wbinv_range);
74 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
75 enum dma_data_direction dir)
81 case DMA_BIDIRECTIONAL:
82 cache_op(paddr, size, dma_inv_range);