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 void arch_dma_prep_coherent(struct page *page, size_t size)
19 if (PageHighMem(page)) {
20 unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
23 void *ptr = kmap_atomic(page);
24 size_t _size = (size < PAGE_SIZE) ? size : PAGE_SIZE;
26 memset(ptr, 0, _size);
27 dma_wbinv_range((unsigned long)ptr,
28 (unsigned long)ptr + _size);
37 void *ptr = page_address(page);
40 dma_wbinv_range((unsigned long)ptr, (unsigned long)ptr + size);
44 static inline void cache_op(phys_addr_t paddr, size_t size,
45 void (*fn)(unsigned long start, unsigned long end))
47 struct page *page = pfn_to_page(paddr >> PAGE_SHIFT);
48 unsigned int offset = paddr & ~PAGE_MASK;
55 if (PageHighMem(page)) {
58 if (offset + len > PAGE_SIZE) {
59 if (offset >= PAGE_SIZE) {
60 page += offset >> PAGE_SHIFT;
63 len = PAGE_SIZE - offset;
66 addr = kmap_atomic(page);
67 start = (unsigned long)(addr + offset);
68 fn(start, start + len);
71 start = (unsigned long)phys_to_virt(paddr);
72 fn(start, start + size);
80 void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
81 size_t size, enum dma_data_direction dir)
85 cache_op(paddr, size, dma_wb_range);
88 case DMA_BIDIRECTIONAL:
89 cache_op(paddr, size, dma_wbinv_range);
96 void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
97 size_t size, enum dma_data_direction dir)
101 cache_op(paddr, size, dma_wb_range);
103 case DMA_FROM_DEVICE:
104 case DMA_BIDIRECTIONAL:
105 cache_op(paddr, size, dma_wbinv_range);