arch/mips/loongson/common/dma-swiotlb.c

   1 #include <linux/mm.h>
   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>
   7
   8 #include <asm/bootinfo.h>
   9 #include <boot_param.h>
  10 #include <dma-coherence.h>
  11
  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)
  14 {
  15         void *ret;
  16
  17         if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
  18                 return ret;
  19
  20         /* ignore region specifiers */
  21         gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
  22
  23 #ifdef CONFIG_ISA
  24         if (dev == NULL)
  25                 gfp |= __GFP_DMA;
  26         else
  27 #endif
  28 #ifdef CONFIG_ZONE_DMA
  29         if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
  30                 gfp |= __GFP_DMA;
  31         else
  32 #endif
  33 #ifdef CONFIG_ZONE_DMA32
  34         if (dev->coherent_dma_mask < DMA_BIT_MASK(40))
  35                 gfp |= __GFP_DMA32;
  36         else
  37 #endif
  38         ;
  39         gfp |= __GFP_NORETRY;
  40
  41         ret = swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
  42         mb();
  43         return ret;
  44 }
  45
  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)
  48 {
  49         int order = get_order(size);
  50
  51         if (dma_release_from_coherent(dev, order, vaddr))
  52                 return;
  53
  54         swiotlb_free_coherent(dev, size, vaddr, dma_handle);
  55 }
  56
  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)
  61 {
  62         dma_addr_t daddr = swiotlb_map_page(dev, page, offset, size,
  63                                         dir, attrs);
  64         mb();
  65         return daddr;
  66 }
  67
  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)
  71 {
  72         int r = swiotlb_map_sg_attrs(dev, sg, nents, dir, NULL);
  73         mb();
  74
  75         return r;
  76 }
  77
  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)
  81 {
  82         swiotlb_sync_single_for_device(dev, dma_handle, size, dir);
  83         mb();
  84 }
  85
  86 static void loongson_dma_sync_sg_for_device(struct device *dev,
  87                                 struct scatterlist *sg, int nents,
  88                                 enum dma_data_direction dir)
  89 {
  90         swiotlb_sync_sg_for_device(dev, sg, nents, dir);
  91         mb();
  92 }
  93
  94 static int loongson_dma_set_mask(struct device *dev, u64 mask)
  95 {
  96         if (mask > DMA_BIT_MASK(loongson_sysconf.dma_mask_bits)) {
  97                 *dev->dma_mask = DMA_BIT_MASK(loongson_sysconf.dma_mask_bits);
  98                 return -EIO;
  99         }
 100
 101         *dev->dma_mask = mask;
 102
 103         return 0;
 104 }
 105
 106 dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
 107 {
 108         return paddr;
 109 }
 110
 111 phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
 112 {
 113         return daddr;
 114 }
 115
 116 static struct dma_map_ops loongson_dma_map_ops = {
 117         .alloc = loongson_dma_alloc_coherent,
 118         .free = loongson_dma_free_coherent,
 119         .map_page = loongson_dma_map_page,
 120         .unmap_page = swiotlb_unmap_page,
 121         .map_sg = loongson_dma_map_sg,
 122         .unmap_sg = swiotlb_unmap_sg_attrs,
 123         .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
 124         .sync_single_for_device = loongson_dma_sync_single_for_device,
 125         .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
 126         .sync_sg_for_device = loongson_dma_sync_sg_for_device,
 127         .mapping_error = swiotlb_dma_mapping_error,
 128         .dma_supported = swiotlb_dma_supported,
 129         .set_dma_mask = loongson_dma_set_mask
 130 };
 131
 132 void __init plat_swiotlb_setup(void)
 133 {
 134         swiotlb_init(1);
 135         mips_dma_map_ops = &loongson_dma_map_ops;
 136 }