371 строка
8.4 KiB
C
371 строка
8.4 KiB
C
/*
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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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* Copyright (C) 2000 Ani Joshi <ajoshi@unixbox.com>
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* Copyright (C) 2000, 2001, 06 Ralf Baechle <ralf@linux-mips.org>
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* swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
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*/
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#include <linux/types.h>
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#include <linux/dma-mapping.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include <linux/string.h>
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#include <linux/gfp.h>
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#include <asm/cache.h>
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#include <asm/io.h>
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#include <dma-coherence.h>
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static inline unsigned long dma_addr_to_virt(struct device *dev,
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dma_addr_t dma_addr)
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{
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unsigned long addr = plat_dma_addr_to_phys(dev, dma_addr);
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return (unsigned long)phys_to_virt(addr);
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}
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/*
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* Warning on the terminology - Linux calls an uncached area coherent;
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* MIPS terminology calls memory areas with hardware maintained coherency
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* coherent.
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*/
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static inline int cpu_is_noncoherent_r10000(struct device *dev)
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{
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return !plat_device_is_coherent(dev) &&
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(current_cpu_type() == CPU_R10000 ||
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current_cpu_type() == CPU_R12000);
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}
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static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp)
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{
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/* ignore region specifiers */
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gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
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#ifdef CONFIG_ZONE_DMA
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if (dev == NULL)
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gfp |= __GFP_DMA;
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else if (dev->coherent_dma_mask < DMA_BIT_MASK(24))
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gfp |= __GFP_DMA;
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else
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#endif
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#ifdef CONFIG_ZONE_DMA32
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if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
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gfp |= __GFP_DMA32;
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else
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#endif
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;
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/* Don't invoke OOM killer */
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gfp |= __GFP_NORETRY;
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return gfp;
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}
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void *dma_alloc_noncoherent(struct device *dev, size_t size,
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dma_addr_t * dma_handle, gfp_t gfp)
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{
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void *ret;
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gfp = massage_gfp_flags(dev, gfp);
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ret = (void *) __get_free_pages(gfp, get_order(size));
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if (ret != NULL) {
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memset(ret, 0, size);
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*dma_handle = plat_map_dma_mem(dev, ret, size);
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}
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return ret;
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}
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EXPORT_SYMBOL(dma_alloc_noncoherent);
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void *dma_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t * dma_handle, gfp_t gfp)
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{
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void *ret;
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if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
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return ret;
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gfp = massage_gfp_flags(dev, gfp);
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ret = (void *) __get_free_pages(gfp, get_order(size));
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if (ret) {
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memset(ret, 0, size);
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*dma_handle = plat_map_dma_mem(dev, ret, size);
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if (!plat_device_is_coherent(dev)) {
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dma_cache_wback_inv((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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}
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EXPORT_SYMBOL(dma_alloc_coherent);
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void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle)
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{
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plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
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free_pages((unsigned long) vaddr, get_order(size));
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}
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EXPORT_SYMBOL(dma_free_noncoherent);
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void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle)
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{
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unsigned long addr = (unsigned long) vaddr;
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int order = get_order(size);
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if (dma_release_from_coherent(dev, order, vaddr))
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return;
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plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
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if (!plat_device_is_coherent(dev))
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addr = CAC_ADDR(addr);
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free_pages(addr, get_order(size));
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}
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EXPORT_SYMBOL(dma_free_coherent);
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static inline void __dma_sync(unsigned long addr, size_t size,
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enum dma_data_direction direction)
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{
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switch (direction) {
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case DMA_TO_DEVICE:
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dma_cache_wback(addr, size);
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break;
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case DMA_FROM_DEVICE:
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dma_cache_inv(addr, size);
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break;
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case DMA_BIDIRECTIONAL:
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dma_cache_wback_inv(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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dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
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enum dma_data_direction direction)
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{
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unsigned long addr = (unsigned long) ptr;
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if (!plat_device_is_coherent(dev))
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__dma_sync(addr, size, direction);
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return plat_map_dma_mem(dev, ptr, size);
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}
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EXPORT_SYMBOL(dma_map_single);
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void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
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enum dma_data_direction direction)
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{
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if (cpu_is_noncoherent_r10000(dev))
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__dma_sync(dma_addr_to_virt(dev, dma_addr), size,
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direction);
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plat_unmap_dma_mem(dev, dma_addr, size, direction);
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}
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EXPORT_SYMBOL(dma_unmap_single);
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int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction direction)
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{
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int i;
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BUG_ON(direction == DMA_NONE);
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for (i = 0; i < nents; i++, sg++) {
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unsigned long addr;
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addr = (unsigned long) sg_virt(sg);
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if (!plat_device_is_coherent(dev) && addr)
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__dma_sync(addr, sg->length, direction);
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sg->dma_address = plat_map_dma_mem(dev,
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(void *)addr, sg->length);
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}
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return nents;
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}
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EXPORT_SYMBOL(dma_map_sg);
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dma_addr_t dma_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size, enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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if (!plat_device_is_coherent(dev)) {
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unsigned long addr;
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addr = (unsigned long) page_address(page) + offset;
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__dma_sync(addr, size, direction);
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}
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return plat_map_dma_mem_page(dev, page) + offset;
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}
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EXPORT_SYMBOL(dma_map_page);
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void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
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enum dma_data_direction direction)
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{
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unsigned long addr;
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int i;
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BUG_ON(direction == DMA_NONE);
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for (i = 0; i < nhwentries; i++, sg++) {
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if (!plat_device_is_coherent(dev) &&
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direction != DMA_TO_DEVICE) {
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addr = (unsigned long) sg_virt(sg);
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if (addr)
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__dma_sync(addr, sg->length, direction);
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}
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plat_unmap_dma_mem(dev, sg->dma_address, sg->length, direction);
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}
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}
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EXPORT_SYMBOL(dma_unmap_sg);
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void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
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size_t size, enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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if (cpu_is_noncoherent_r10000(dev)) {
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unsigned long addr;
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addr = dma_addr_to_virt(dev, dma_handle);
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__dma_sync(addr, size, direction);
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}
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}
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EXPORT_SYMBOL(dma_sync_single_for_cpu);
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void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
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size_t size, enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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plat_extra_sync_for_device(dev);
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if (!plat_device_is_coherent(dev)) {
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unsigned long addr;
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addr = dma_addr_to_virt(dev, dma_handle);
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__dma_sync(addr, size, direction);
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}
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}
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EXPORT_SYMBOL(dma_sync_single_for_device);
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void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
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unsigned long offset, size_t size, enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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if (cpu_is_noncoherent_r10000(dev)) {
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unsigned long addr;
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addr = dma_addr_to_virt(dev, dma_handle);
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__dma_sync(addr + offset, size, direction);
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}
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}
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EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
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void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
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unsigned long offset, size_t size, enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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plat_extra_sync_for_device(dev);
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if (!plat_device_is_coherent(dev)) {
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unsigned long addr;
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addr = dma_addr_to_virt(dev, dma_handle);
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__dma_sync(addr + offset, size, direction);
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}
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}
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EXPORT_SYMBOL(dma_sync_single_range_for_device);
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void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
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enum dma_data_direction direction)
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{
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int i;
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BUG_ON(direction == DMA_NONE);
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/* Make sure that gcc doesn't leave the empty loop body. */
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for (i = 0; i < nelems; i++, sg++) {
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if (cpu_is_noncoherent_r10000(dev))
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__dma_sync((unsigned long)page_address(sg_page(sg)),
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sg->length, direction);
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}
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}
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EXPORT_SYMBOL(dma_sync_sg_for_cpu);
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void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
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enum dma_data_direction direction)
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{
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int i;
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BUG_ON(direction == DMA_NONE);
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/* Make sure that gcc doesn't leave the empty loop body. */
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for (i = 0; i < nelems; i++, sg++) {
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if (!plat_device_is_coherent(dev))
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__dma_sync((unsigned long)page_address(sg_page(sg)),
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sg->length, direction);
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}
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}
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EXPORT_SYMBOL(dma_sync_sg_for_device);
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int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
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{
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return plat_dma_mapping_error(dev, dma_addr);
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}
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EXPORT_SYMBOL(dma_mapping_error);
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int dma_supported(struct device *dev, u64 mask)
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{
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return plat_dma_supported(dev, mask);
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}
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EXPORT_SYMBOL(dma_supported);
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void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
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enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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plat_extra_sync_for_device(dev);
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if (!plat_device_is_coherent(dev))
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__dma_sync((unsigned long)vaddr, size, direction);
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}
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EXPORT_SYMBOL(dma_cache_sync);
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