2 #include <linux/init.h>
3 #include <linux/dma-mapping.h>
4 #include <linux/scatterlist.h>
5 #include <linux/swiotlb.h>
6 #include <linux/bootmem.h>
8 #include <asm/bootinfo.h>
9 #include <boot_param.h>
10 #include <dma-coherence.h>
12 static void *loongson_dma_alloc_coherent(struct device *dev, size_t size,
13 dma_addr_t *dma_handle, gfp_t gfp, struct dma_attrs *attrs)
17 if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
20 /* ignore region specifiers */
21 gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
28 #ifdef CONFIG_ZONE_DMA
29 if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
33 #ifdef CONFIG_ZONE_DMA32
34 if (dev->coherent_dma_mask < DMA_BIT_MASK(40))
41 ret = swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
46 static void loongson_dma_free_coherent(struct device *dev, size_t size,
47 void *vaddr, dma_addr_t dma_handle, struct dma_attrs *attrs)
49 int order = get_order(size);
51 if (dma_release_from_coherent(dev, order, vaddr))
54 swiotlb_free_coherent(dev, size, vaddr, dma_handle);
57 static dma_addr_t loongson_dma_map_page(struct device *dev, struct page *page,
58 unsigned long offset, size_t size,
59 enum dma_data_direction dir,
60 struct dma_attrs *attrs)
62 dma_addr_t daddr = swiotlb_map_page(dev, page, offset, size,
68 static int loongson_dma_map_sg(struct device *dev, struct scatterlist *sg,
69 int nents, enum dma_data_direction dir,
70 struct dma_attrs *attrs)
72 int r = swiotlb_map_sg_attrs(dev, sg, nents, dir, NULL);
78 static void loongson_dma_sync_single_for_device(struct device *dev,
79 dma_addr_t dma_handle, size_t size,
80 enum dma_data_direction dir)
82 swiotlb_sync_single_for_device(dev, dma_handle, size, dir);
86 static void loongson_dma_sync_sg_for_device(struct device *dev,
87 struct scatterlist *sg, int nents,
88 enum dma_data_direction dir)
90 swiotlb_sync_sg_for_device(dev, sg, nents, dir);
94 static int loongson_dma_set_mask(struct device *dev, u64 mask)
96 if (mask > DMA_BIT_MASK(loongson_sysconf.dma_mask_bits)) {
97 *dev->dma_mask = DMA_BIT_MASK(loongson_sysconf.dma_mask_bits);
101 *dev->dma_mask = mask;
106 dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
109 #ifdef CONFIG_PHYS48_TO_HT40
110 /* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
111 * Loongson-3's 48bit address space and embed it into 40bit */
112 nid = (paddr >> 44) & 0x3;
113 paddr = ((nid << 44) ^ paddr) | (nid << 37);
118 phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
121 #ifdef CONFIG_PHYS48_TO_HT40
122 /* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
123 * Loongson-3's 48bit address space and embed it into 40bit */
124 nid = (daddr >> 37) & 0x3;
125 daddr = ((nid << 37) ^ daddr) | (nid << 44);
130 static struct dma_map_ops loongson_dma_map_ops = {
131 .alloc = loongson_dma_alloc_coherent,
132 .free = loongson_dma_free_coherent,
133 .map_page = loongson_dma_map_page,
134 .unmap_page = swiotlb_unmap_page,
135 .map_sg = loongson_dma_map_sg,
136 .unmap_sg = swiotlb_unmap_sg_attrs,
137 .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
138 .sync_single_for_device = loongson_dma_sync_single_for_device,
139 .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
140 .sync_sg_for_device = loongson_dma_sync_sg_for_device,
141 .mapping_error = swiotlb_dma_mapping_error,
142 .dma_supported = swiotlb_dma_supported,
143 .set_dma_mask = loongson_dma_set_mask
146 void __init plat_swiotlb_setup(void)
149 mips_dma_map_ops = &loongson_dma_map_ops;