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- // SPDX-License-Identifier: GPL-2.0
- // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
- #include <linux/cache.h>
- #include <linux/dma-map-ops.h>
- #include <linux/genalloc.h>
- #include <linux/highmem.h>
- #include <linux/io.h>
- #include <linux/mm.h>
- #include <linux/scatterlist.h>
- #include <linux/types.h>
- #include <asm/cache.h>
- static inline void cache_op(phys_addr_t paddr, size_t size,
- void (*fn)(unsigned long start, unsigned long end))
- {
- struct page *page = phys_to_page(paddr);
- void *start = __va(page_to_phys(page));
- unsigned long offset = offset_in_page(paddr);
- size_t left = size;
- do {
- size_t len = left;
- if (offset + len > PAGE_SIZE)
- len = PAGE_SIZE - offset;
- if (PageHighMem(page)) {
- start = kmap_atomic(page);
- fn((unsigned long)start + offset,
- (unsigned long)start + offset + len);
- kunmap_atomic(start);
- } else {
- fn((unsigned long)start + offset,
- (unsigned long)start + offset + len);
- }
- offset = 0;
- page++;
- start += PAGE_SIZE;
- left -= len;
- } while (left);
- }
- static void dma_wbinv_set_zero_range(unsigned long start, unsigned long end)
- {
- memset((void *)start, 0, end - start);
- dma_wbinv_range(start, end);
- }
- void arch_dma_prep_coherent(struct page *page, size_t size)
- {
- cache_op(page_to_phys(page), size, dma_wbinv_set_zero_range);
- }
- void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
- enum dma_data_direction dir)
- {
- switch (dir) {
- case DMA_TO_DEVICE:
- cache_op(paddr, size, dma_wb_range);
- break;
- case DMA_FROM_DEVICE:
- case DMA_BIDIRECTIONAL:
- cache_op(paddr, size, dma_wbinv_range);
- break;
- default:
- BUG();
- }
- }
- void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
- enum dma_data_direction dir)
- {
- switch (dir) {
- case DMA_TO_DEVICE:
- return;
- case DMA_FROM_DEVICE:
- case DMA_BIDIRECTIONAL:
- cache_op(paddr, size, dma_inv_range);
- break;
- default:
- BUG();
- }
- }
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