mirror of https://gitee.com/openkylin/linux.git
98 lines
2.0 KiB
C
98 lines
2.0 KiB
C
/*
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* arch/sh/mm/consistent.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/dma-mapping.h>
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#include <asm/cacheflush.h>
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#include <asm/addrspace.h>
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#include <asm/io.h>
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void *consistent_alloc(gfp_t gfp, size_t size, dma_addr_t *handle)
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{
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struct page *page, *end, *free;
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void *ret, *vp;
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int order;
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size = PAGE_ALIGN(size);
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order = get_order(size);
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page = alloc_pages(gfp, order);
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if (!page)
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return NULL;
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split_page(page, order);
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ret = page_address(page);
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*handle = virt_to_phys(ret);
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vp = ioremap_nocache(*handle, size);
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if (!vp) {
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free_pages((unsigned long)ret, order);
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return NULL;
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}
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memset(vp, 0, size);
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/*
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* We must flush the cache before we pass it on to the device
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*/
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dma_cache_sync(NULL, ret, size, DMA_BIDIRECTIONAL);
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page = virt_to_page(ret);
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free = page + (size >> PAGE_SHIFT);
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end = page + (1 << order);
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while (++page < end) {
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/* Free any unused pages */
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if (page >= free) {
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__free_page(page);
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}
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}
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return vp;
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}
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EXPORT_SYMBOL(consistent_alloc);
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void consistent_free(void *vaddr, size_t size, dma_addr_t dma_handle)
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{
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struct page *page;
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unsigned long addr;
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addr = (unsigned long)phys_to_virt((unsigned long)dma_handle);
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page = virt_to_page(addr);
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free_pages(addr, get_order(size));
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iounmap(vaddr);
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}
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EXPORT_SYMBOL(consistent_free);
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void consistent_sync(void *vaddr, size_t size, int direction)
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{
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#ifdef CONFIG_CPU_SH5
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void *p1addr = vaddr;
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#else
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void *p1addr = (void*) P1SEGADDR((unsigned long)vaddr);
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#endif
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switch (direction) {
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case DMA_FROM_DEVICE: /* invalidate only */
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__flush_invalidate_region(p1addr, size);
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break;
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case DMA_TO_DEVICE: /* writeback only */
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__flush_wback_region(p1addr, size);
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break;
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case DMA_BIDIRECTIONAL: /* writeback and invalidate */
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__flush_purge_region(p1addr, 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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EXPORT_SYMBOL(consistent_sync);
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