137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/dma-mapping.h>
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#include <linux/scatterlist.h>
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#include <linux/swiotlb.h>
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#include <linux/bootmem.h>
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#include <asm/bootinfo.h>
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#include <boot_param.h>
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#include <dma-coherence.h>
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static void *loongson_dma_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp, struct dma_attrs *attrs)
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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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/* ignore region specifiers */
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gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
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#ifdef CONFIG_ISA
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if (dev == NULL)
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gfp |= __GFP_DMA;
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else
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#endif
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#ifdef CONFIG_ZONE_DMA
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if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
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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(40))
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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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gfp |= __GFP_NORETRY;
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ret = swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
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mb();
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return ret;
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}
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static void loongson_dma_free_coherent(struct device *dev, size_t size,
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void *vaddr, dma_addr_t dma_handle, struct dma_attrs *attrs)
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{
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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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swiotlb_free_coherent(dev, size, vaddr, dma_handle);
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}
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static dma_addr_t loongson_dma_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size,
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enum dma_data_direction dir,
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struct dma_attrs *attrs)
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{
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dma_addr_t daddr = swiotlb_map_page(dev, page, offset, size,
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dir, attrs);
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mb();
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return daddr;
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}
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static int loongson_dma_map_sg(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction dir,
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struct dma_attrs *attrs)
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{
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int r = swiotlb_map_sg_attrs(dev, sg, nents, dir, NULL);
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mb();
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return r;
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}
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static void loongson_dma_sync_single_for_device(struct device *dev,
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dma_addr_t dma_handle, size_t size,
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enum dma_data_direction dir)
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{
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swiotlb_sync_single_for_device(dev, dma_handle, size, dir);
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mb();
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}
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static void loongson_dma_sync_sg_for_device(struct device *dev,
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struct scatterlist *sg, int nents,
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enum dma_data_direction dir)
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{
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swiotlb_sync_sg_for_device(dev, sg, nents, dir);
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mb();
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}
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static int loongson_dma_set_mask(struct device *dev, u64 mask)
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{
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if (mask > DMA_BIT_MASK(loongson_sysconf.dma_mask_bits)) {
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*dev->dma_mask = DMA_BIT_MASK(loongson_sysconf.dma_mask_bits);
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return -EIO;
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}
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*dev->dma_mask = mask;
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return 0;
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}
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dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
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{
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return paddr;
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}
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phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
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{
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return daddr;
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}
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static struct dma_map_ops loongson_dma_map_ops = {
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.alloc = loongson_dma_alloc_coherent,
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.free = loongson_dma_free_coherent,
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.map_page = loongson_dma_map_page,
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.unmap_page = swiotlb_unmap_page,
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.map_sg = loongson_dma_map_sg,
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.unmap_sg = swiotlb_unmap_sg_attrs,
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.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
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.sync_single_for_device = loongson_dma_sync_single_for_device,
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.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
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.sync_sg_for_device = loongson_dma_sync_sg_for_device,
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.mapping_error = swiotlb_dma_mapping_error,
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.dma_supported = swiotlb_dma_supported,
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.set_dma_mask = loongson_dma_set_mask
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};
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void __init plat_swiotlb_setup(void)
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{
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swiotlb_init(1);
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mips_dma_map_ops = &loongson_dma_map_ops;
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}
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