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 <linux/version.h>
13 #include <asm/cache.h>
15 static inline void cache_op(phys_addr_t paddr, size_t size,
16 void (*fn)(unsigned long start, unsigned long end))
18 struct page *page = phys_to_page(paddr);
19 void *start = __va(page_to_phys(page));
20 unsigned long offset = offset_in_page(paddr);
26 if (offset + len > PAGE_SIZE)
27 len = PAGE_SIZE - offset;
29 if (PageHighMem(page)) {
30 start = kmap_atomic(page);
32 fn((unsigned long)start + offset,
33 (unsigned long)start + offset + len);
37 fn((unsigned long)start + offset,
38 (unsigned long)start + offset + len);
48 static void dma_wbinv_set_zero_range(unsigned long start, unsigned long end)
50 memset((void *)start, 0, end - start);
51 dma_wbinv_range(start, end);
54 void arch_dma_prep_coherent(struct page *page, size_t size)
56 cache_op(page_to_phys(page), size, dma_wbinv_set_zero_range);
59 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
60 enum dma_data_direction dir)
64 cache_op(paddr, size, dma_wb_range);
67 case DMA_BIDIRECTIONAL:
68 cache_op(paddr, size, dma_wbinv_range);
75 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
76 enum dma_data_direction dir)
82 case DMA_BIDIRECTIONAL:
83 cache_op(paddr, size, dma_inv_range);