add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/nios2/mm/dma-mapping.c
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@@ -18,8 +18,8 @@
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 #include <linux/cache.h>
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 #include <asm/cacheflush.h>
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-void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
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-		size_t size, enum dma_data_direction dir)
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+void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
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+		enum dma_data_direction dir)
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 {
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 	void *vaddr = phys_to_virt(paddr);
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..
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@@ -42,8 +42,8 @@
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 	}
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 }
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-void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
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-		size_t size, enum dma_data_direction dir)
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+void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
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+		enum dma_data_direction dir)
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 {
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 	void *vaddr = phys_to_virt(paddr);
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@@ -60,32 +60,18 @@
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 	}
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 }
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-void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
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-		gfp_t gfp, unsigned long attrs)
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+void arch_dma_prep_coherent(struct page *page, size_t size)
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 {
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-	void *ret;
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+	unsigned long start = (unsigned long)page_address(page);
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-	/* optimized page clearing */
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-	gfp |= __GFP_ZERO;
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-
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-	if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
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-		gfp |= GFP_DMA;
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-
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-	ret = (void *) __get_free_pages(gfp, get_order(size));
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-	if (ret != NULL) {
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-		*dma_handle = virt_to_phys(ret);
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-		flush_dcache_range((unsigned long) ret,
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-			(unsigned long) ret + size);
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-		ret = UNCAC_ADDR(ret);
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-	}
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-
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-	return ret;
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+	flush_dcache_range(start, start + size);
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 }
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-void arch_dma_free(struct device *dev, size_t size, void *vaddr,
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-		dma_addr_t dma_handle, unsigned long attrs)
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+void *arch_dma_set_uncached(void *ptr, size_t size)
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 {
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-	unsigned long addr = (unsigned long) CAC_ADDR((unsigned long) vaddr);
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+	unsigned long addr = (unsigned long)ptr;
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-	free_pages(addr, get_order(size));
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+	addr |= CONFIG_NIOS2_IO_REGION_BASE;
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+
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+	return (void *)ptr;
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 }