84 lines
2 KiB
C
84 lines
2 KiB
C
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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 <asm/cacheflush.h>
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#include <asm/addrspace.h>
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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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{
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void *ret, *ret_nocache;
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int order = get_order(size);
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gfp |= __GFP_ZERO;
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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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* 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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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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split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order);
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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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return ret_nocache;
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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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if (!WARN_ON(!dev))
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pfn += dev->dma_pfn_offset;
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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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iounmap(vaddr);
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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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{
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void *addr = sh_cacheop_vaddr(phys_to_virt(paddr));
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switch (dir) {
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case DMA_FROM_DEVICE: /* invalidate only */
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__flush_invalidate_region(addr, size);
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break;
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case DMA_TO_DEVICE: /* writeback only */
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__flush_wback_region(addr, size);
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break;
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case DMA_BIDIRECTIONAL: /* writeback and invalidate */
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__flush_purge_region(addr, size);
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break;
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default:
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BUG();
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}
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}
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