arch/mips/loongson64/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         /* ignore region specifiers */
  18         gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
  19
  20 #ifdef CONFIG_ISA
  21         if (dev == NULL)
  22                 gfp |= __GFP_DMA;
  23         else
  24 #endif
  25 #ifdef CONFIG_ZONE_DMA
  26         if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
  27                 gfp |= __GFP_DMA;
  28         else
  29 #endif
  30 #ifdef CONFIG_ZONE_DMA32
  31         if (dev->coherent_dma_mask < DMA_BIT_MASK(40))
  32                 gfp |= __GFP_DMA32;
  33         else
  34 #endif
  35         ;
  36         gfp |= __GFP_NORETRY;
  37
  38         ret = swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
  39         mb();
  40         return ret;
  41 }
  42
  43 static void loongson_dma_free_coherent(struct device *dev, size_t size,
  44                 void *vaddr, dma_addr_t dma_handle, struct dma_attrs *attrs)
  45 {
  46         swiotlb_free_coherent(dev, size, vaddr, dma_handle);
  47 }
  48
  49 static dma_addr_t loongson_dma_map_page(struct device *dev, struct page *page,
  50                                 unsigned long offset, size_t size,
  51                                 enum dma_data_direction dir,
  52                                 struct dma_attrs *attrs)
  53 {
  54         dma_addr_t daddr = swiotlb_map_page(dev, page, offset, size,
  55                                         dir, attrs);
  56         mb();
  57         return daddr;
  58 }
  59
  60 static int loongson_dma_map_sg(struct device *dev, struct scatterlist *sg,
  61                                 int nents, enum dma_data_direction dir,
  62                                 struct dma_attrs *attrs)
  63 {
  64         int r = swiotlb_map_sg_attrs(dev, sg, nents, dir, NULL);
  65         mb();
  66
  67         return r;
  68 }
  69
  70 static void loongson_dma_sync_single_for_device(struct device *dev,
  71                                 dma_addr_t dma_handle, size_t size,
  72                                 enum dma_data_direction dir)
  73 {
  74         swiotlb_sync_single_for_device(dev, dma_handle, size, dir);
  75         mb();
  76 }
  77
  78 static void loongson_dma_sync_sg_for_device(struct device *dev,
  79                                 struct scatterlist *sg, int nents,
  80                                 enum dma_data_direction dir)
  81 {
  82         swiotlb_sync_sg_for_device(dev, sg, nents, dir);
  83         mb();
  84 }
  85
  86 static int loongson_dma_set_mask(struct device *dev, u64 mask)
  87 {
  88         if (!dev->dma_mask || !dma_supported(dev, mask))
  89                 return -EIO;
  90
  91         if (mask > DMA_BIT_MASK(loongson_sysconf.dma_mask_bits)) {
  92                 *dev->dma_mask = DMA_BIT_MASK(loongson_sysconf.dma_mask_bits);
  93                 return -EIO;
  94         }
  95
  96         *dev->dma_mask = mask;
  97
  98         return 0;
  99 }
 100
 101 dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
 102 {
 103         long nid;
 104 #ifdef CONFIG_PHYS48_TO_HT40
 105         /* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
 106          * Loongson-3's 48bit address space and embed it into 40bit */
 107         nid = (paddr >> 44) & 0x3;
 108         paddr = ((nid << 44) ^ paddr) | (nid << 37);
 109 #endif
 110         return paddr;
 111 }
 112
 113 phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
 114 {
 115         long nid;
 116 #ifdef CONFIG_PHYS48_TO_HT40
 117         /* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
 118          * Loongson-3's 48bit address space and embed it into 40bit */
 119         nid = (daddr >> 37) & 0x3;
 120         daddr = ((nid << 37) ^ daddr) | (nid << 44);
 121 #endif
 122         return daddr;
 123 }
 124
 125 static struct dma_map_ops loongson_dma_map_ops = {
 126         .alloc = loongson_dma_alloc_coherent,
 127         .free = loongson_dma_free_coherent,
 128         .map_page = loongson_dma_map_page,
 129         .unmap_page = swiotlb_unmap_page,
 130         .map_sg = loongson_dma_map_sg,
 131         .unmap_sg = swiotlb_unmap_sg_attrs,
 132         .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
 133         .sync_single_for_device = loongson_dma_sync_single_for_device,
 134         .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
 135         .sync_sg_for_device = loongson_dma_sync_sg_for_device,
 136         .mapping_error = swiotlb_dma_mapping_error,
 137         .dma_supported = swiotlb_dma_supported,
 138         .set_dma_mask = loongson_dma_set_mask
 139 };
 140
 141 void __init plat_swiotlb_setup(void)
 142 {
 143         swiotlb_init(1);
 144         mips_dma_map_ops = &loongson_dma_map_ops;
 145 }