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-mapping.h>
6 #include <linux/dma-contiguous.h>
7 #include <linux/dma-noncoherent.h>
8 #include <linux/genalloc.h>
9 #include <linux/highmem.h>
12 #include <linux/scatterlist.h>
13 #include <linux/types.h>
14 #include <linux/version.h>
15 #include <asm/cache.h>
17 static inline void cache_op(phys_addr_t paddr, size_t size,
18 void (*fn)(unsigned long start, unsigned long end))
20 struct page *page = phys_to_page(paddr);
21 void *start = __va(page_to_phys(page));
22 unsigned long offset = offset_in_page(paddr);
28 if (offset + len > PAGE_SIZE)
29 len = PAGE_SIZE - offset;
31 if (PageHighMem(page)) {
32 start = kmap_atomic(page);
34 fn((unsigned long)start + offset,
35 (unsigned long)start + offset + len);
39 fn((unsigned long)start + offset,
40 (unsigned long)start + offset + len);
50 static void dma_wbinv_set_zero_range(unsigned long start, unsigned long end)
52 memset((void *)start, 0, end - start);
53 dma_wbinv_range(start, end);
56 void arch_dma_prep_coherent(struct page *page, size_t size)
58 cache_op(page_to_phys(page), size, dma_wbinv_set_zero_range);
61 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
62 enum dma_data_direction dir)
66 cache_op(paddr, size, dma_wb_range);
69 case DMA_BIDIRECTIONAL:
70 cache_op(paddr, size, dma_wbinv_range);
77 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
78 enum dma_data_direction dir)
84 case DMA_BIDIRECTIONAL:
85 cache_op(paddr, size, dma_inv_range);