write in 30M

hc

2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/arch/sh/kernel/dma-coherent.c
..
..
@@ -1,69 +1,19 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * Copyright (C) 2004 - 2007  Paul Mundt
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- *
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- * This file is subject to the terms and conditions of the GNU General Public
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- * License.  See the file "COPYING" in the main directory of this archive
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- * for more details.
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  */
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 #include <linux/mm.h>
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-#include <linux/init.h>
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-#include <linux/dma-noncoherent.h>
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-#include <linux/module.h>
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+#include <linux/dma-map-ops.h>
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 #include <asm/cacheflush.h>
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 #include <asm/addrspace.h>
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9
 
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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, *ret_nocache;
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-	int order = get_order(size);
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-
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-	gfp |= __GFP_ZERO;
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-
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-	ret = (void *)__get_free_pages(gfp, order);
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-	if (!ret)
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-		return NULL;
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-
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-	/*
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-	 * Pages from the page allocator may have data present in
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-	 * cache. So flush the cache before using uncached memory.
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-	 */
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-	arch_sync_dma_for_device(dev, virt_to_phys(ret), size,
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-			DMA_BIDIRECTIONAL);
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-
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-	ret_nocache = (void __force *)ioremap_nocache(virt_to_phys(ret), size);
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-	if (!ret_nocache) {
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-		free_pages((unsigned long)ret, order);
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-		return NULL;
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-	}
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-
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-	split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order);
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-
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-	*dma_handle = virt_to_phys(ret);
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-	if (!WARN_ON(!dev))
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-		*dma_handle -= PFN_PHYS(dev->dma_pfn_offset);
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-
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-	return ret_nocache;
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+	__flush_purge_region(page_address(page), 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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-{
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-	int order = get_order(size);
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-	unsigned long pfn = (dma_handle >> PAGE_SHIFT);
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-	int k;
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-
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-	if (!WARN_ON(!dev))
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-		pfn += dev->dma_pfn_offset;
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-
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-	for (k = 0; k < (1 << order); k++)
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-		__free_pages(pfn_to_page(pfn + k), 0);
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-
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-	iounmap(vaddr);
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-}
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-
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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 *addr = sh_cacheop_vaddr(phys_to_virt(paddr));
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