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, unsigned long attrs)
17 /* ignore region specifiers */
18 gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
20 if ((IS_ENABLED(CONFIG_ISA) && dev == NULL) ||
21 (IS_ENABLED(CONFIG_ZONE_DMA) &&
22 dev->coherent_dma_mask < DMA_BIT_MASK(32)))
24 else if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
25 dev->coherent_dma_mask < DMA_BIT_MASK(40))
30 ret = swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
35 static void loongson_dma_free_coherent(struct device *dev, size_t size,
36 void *vaddr, dma_addr_t dma_handle, unsigned long attrs)
38 swiotlb_free_coherent(dev, size, vaddr, dma_handle);
41 static dma_addr_t loongson_dma_map_page(struct device *dev, struct page *page,
42 unsigned long offset, size_t size,
43 enum dma_data_direction dir,
46 dma_addr_t daddr = swiotlb_map_page(dev, page, offset, size,
52 static int loongson_dma_map_sg(struct device *dev, struct scatterlist *sg,
53 int nents, enum dma_data_direction dir,
56 int r = swiotlb_map_sg_attrs(dev, sg, nents, dir, attrs);
62 static void loongson_dma_sync_single_for_device(struct device *dev,
63 dma_addr_t dma_handle, size_t size,
64 enum dma_data_direction dir)
66 swiotlb_sync_single_for_device(dev, dma_handle, size, dir);
70 static void loongson_dma_sync_sg_for_device(struct device *dev,
71 struct scatterlist *sg, int nents,
72 enum dma_data_direction dir)
74 swiotlb_sync_sg_for_device(dev, sg, nents, dir);
78 static int loongson_dma_set_mask(struct device *dev, u64 mask)
80 if (!dev->dma_mask || !dma_supported(dev, mask))
83 if (mask > DMA_BIT_MASK(loongson_sysconf.dma_mask_bits)) {
84 *dev->dma_mask = DMA_BIT_MASK(loongson_sysconf.dma_mask_bits);
88 *dev->dma_mask = mask;
93 dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
96 #ifdef CONFIG_PHYS48_TO_HT40
97 /* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
98 * Loongson-3's 48bit address space and embed it into 40bit */
99 nid = (paddr >> 44) & 0x3;
100 paddr = ((nid << 44) ^ paddr) | (nid << 37);
105 phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
108 #ifdef CONFIG_PHYS48_TO_HT40
109 /* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
110 * Loongson-3's 48bit address space and embed it into 40bit */
111 nid = (daddr >> 37) & 0x3;
112 daddr = ((nid << 37) ^ daddr) | (nid << 44);
117 static struct dma_map_ops loongson_dma_map_ops = {
118 .alloc = loongson_dma_alloc_coherent,
119 .free = loongson_dma_free_coherent,
120 .map_page = loongson_dma_map_page,
121 .unmap_page = swiotlb_unmap_page,
122 .map_sg = loongson_dma_map_sg,
123 .unmap_sg = swiotlb_unmap_sg_attrs,
124 .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
125 .sync_single_for_device = loongson_dma_sync_single_for_device,
126 .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
127 .sync_sg_for_device = loongson_dma_sync_sg_for_device,
128 .mapping_error = swiotlb_dma_mapping_error,
129 .dma_supported = swiotlb_dma_supported,
130 .set_dma_mask = loongson_dma_set_mask
133 void __init plat_swiotlb_setup(void)
136 mips_dma_map_ops = &loongson_dma_map_ops;