arch/mips/loongson64/common/dma-swiotlb.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/mm.h>
   3 #include <linux/init.h>
   4 #include <linux/dma-mapping.h>
   5 #include <linux/scatterlist.h>
   6 #include <linux/swiotlb.h>
   7 #include <linux/bootmem.h>
   8
   9 #include <asm/bootinfo.h>
  10 #include <boot_param.h>
  11 #include <dma-coherence.h>
  12
  13 static void *loongson_dma_alloc_coherent(struct device *dev, size_t size,
  14                 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
  15 {
  16         void *ret;
  17
  18         /* ignore region specifiers */
  19         gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
  20
  21         if ((IS_ENABLED(CONFIG_ISA) && dev == NULL) ||
  22             (IS_ENABLED(CONFIG_ZONE_DMA) &&
  23              dev->coherent_dma_mask < DMA_BIT_MASK(32)))
  24                 gfp |= __GFP_DMA;
  25         else if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
  26                  dev->coherent_dma_mask < DMA_BIT_MASK(40))
  27                 gfp |= __GFP_DMA32;
  28
  29         gfp |= __GFP_NORETRY;
  30
  31         ret = swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
  32         mb();
  33         return ret;
  34 }
  35
  36 static void loongson_dma_free_coherent(struct device *dev, size_t size,
  37                 void *vaddr, dma_addr_t dma_handle, unsigned long attrs)
  38 {
  39         swiotlb_free_coherent(dev, size, vaddr, dma_handle);
  40 }
  41
  42 static dma_addr_t loongson_dma_map_page(struct device *dev, struct page *page,
  43                                 unsigned long offset, size_t size,
  44                                 enum dma_data_direction dir,
  45                                 unsigned long attrs)
  46 {
  47         dma_addr_t daddr = swiotlb_map_page(dev, page, offset, size,
  48                                         dir, attrs);
  49         mb();
  50         return daddr;
  51 }
  52
  53 static int loongson_dma_map_sg(struct device *dev, struct scatterlist *sg,
  54                                 int nents, enum dma_data_direction dir,
  55                                 unsigned long attrs)
  56 {
  57         int r = swiotlb_map_sg_attrs(dev, sg, nents, dir, attrs);
  58         mb();
  59
  60         return r;
  61 }
  62
  63 static void loongson_dma_sync_single_for_device(struct device *dev,
  64                                 dma_addr_t dma_handle, size_t size,
  65                                 enum dma_data_direction dir)
  66 {
  67         swiotlb_sync_single_for_device(dev, dma_handle, size, dir);
  68         mb();
  69 }
  70
  71 static void loongson_dma_sync_sg_for_device(struct device *dev,
  72                                 struct scatterlist *sg, int nents,
  73                                 enum dma_data_direction dir)
  74 {
  75         swiotlb_sync_sg_for_device(dev, sg, nents, dir);
  76         mb();
  77 }
  78
  79 static int loongson_dma_supported(struct device *dev, u64 mask)
  80 {
  81         if (mask > DMA_BIT_MASK(loongson_sysconf.dma_mask_bits))
  82                 return 0;
  83         return swiotlb_dma_supported(dev, mask);
  84 }
  85
  86 dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  87 {
  88         long nid;
  89 #ifdef CONFIG_PHYS48_TO_HT40
  90         /* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
  91          * Loongson-3's 48bit address space and embed it into 40bit */
  92         nid = (paddr >> 44) & 0x3;
  93         paddr = ((nid << 44) ^ paddr) | (nid << 37);
  94 #endif
  95         return paddr;
  96 }
  97
  98 phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
  99 {
 100         long nid;
 101 #ifdef CONFIG_PHYS48_TO_HT40
 102         /* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
 103          * Loongson-3's 48bit address space and embed it into 40bit */
 104         nid = (daddr >> 37) & 0x3;
 105         daddr = ((nid << 37) ^ daddr) | (nid << 44);
 106 #endif
 107         return daddr;
 108 }
 109
 110 static const struct dma_map_ops loongson_dma_map_ops = {
 111         .alloc = loongson_dma_alloc_coherent,
 112         .free = loongson_dma_free_coherent,
 113         .map_page = loongson_dma_map_page,
 114         .unmap_page = swiotlb_unmap_page,
 115         .map_sg = loongson_dma_map_sg,
 116         .unmap_sg = swiotlb_unmap_sg_attrs,
 117         .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
 118         .sync_single_for_device = loongson_dma_sync_single_for_device,
 119         .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
 120         .sync_sg_for_device = loongson_dma_sync_sg_for_device,
 121         .mapping_error = swiotlb_dma_mapping_error,
 122         .dma_supported = loongson_dma_supported,
 123 };
 124
 125 void __init plat_swiotlb_setup(void)
 126 {
 127         swiotlb_init(1);
 128         mips_dma_map_ops = &loongson_dma_map_ops;
 129 }