1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2005-2017 Andes Technology Corporation
4 #include <linux/types.h>
6 #include <linux/dma-noncoherent.h>
7 #include <linux/cache.h>
8 #include <linux/highmem.h>
9 #include <asm/cacheflush.h>
10 #include <asm/tlbflush.h>
11 #include <asm/proc-fns.h>
13 static inline void cache_op(phys_addr_t paddr, size_t size,
14 void (*fn)(unsigned long start, unsigned long end))
16 struct page *page = pfn_to_page(paddr >> PAGE_SHIFT);
17 unsigned offset = paddr & ~PAGE_MASK;
24 if (PageHighMem(page)) {
27 if (offset + len > PAGE_SIZE) {
28 if (offset >= PAGE_SIZE) {
29 page += offset >> PAGE_SHIFT;
32 len = PAGE_SIZE - offset;
35 addr = kmap_atomic(page);
36 start = (unsigned long)(addr + offset);
37 fn(start, start + len);
40 start = (unsigned long)phys_to_virt(paddr);
41 fn(start, start + size);
49 void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
50 size_t size, enum dma_data_direction dir)
56 case DMA_BIDIRECTIONAL:
57 cache_op(paddr, size, cpu_dma_wb_range);
64 void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
65 size_t size, enum dma_data_direction dir)
71 case DMA_BIDIRECTIONAL:
72 cache_op(paddr, size, cpu_dma_inval_range);
79 void arch_dma_prep_coherent(struct page *page, size_t size)
81 cache_op(page_to_phys(page), size, cpu_dma_wbinval_range);
84 static int __init atomic_pool_init(void)
86 return dma_atomic_pool_init(GFP_KERNEL, pgprot_noncached(PAGE_KERNEL));
88 postcore_initcall(atomic_pool_init);