arch/parisc/include/asm/dma-mapping.h

   1 #ifndef _PARISC_DMA_MAPPING_H
   2 #define _PARISC_DMA_MAPPING_H
   3
   4 #include <asm/cacheflush.h>
   5
   6 /*
   7 ** We need to support 4 different coherent dma models with one binary:
   8 **
   9 **     I/O MMU        consistent method           dma_sync behavior
  10 **  =============   ======================       =======================
  11 **  a) PA-7x00LC    uncachable host memory          flush/purge
  12 **  b) U2/Uturn      cachable host memory              NOP
  13 **  c) Ike/Astro     cachable host memory              NOP
  14 **  d) EPIC/SAGA     memory on EPIC/SAGA         flush/reset DMA channel
  15 **
  16 ** PA-7[13]00LC processors have a GSC bus interface and no I/O MMU.
  17 **
  18 ** Systems (eg PCX-T workstations) that don't fall into the above
  19 ** categories will need to modify the needed drivers to perform
  20 ** flush/purge and allocate "regular" cacheable pages for everything.
  21 */
  22
  23 #ifdef CONFIG_PA11
  24 extern const struct dma_map_ops pcxl_dma_ops;
  25 extern const struct dma_map_ops pcx_dma_ops;
  26 #endif
  27
  28 extern const struct dma_map_ops *hppa_dma_ops;
  29
  30 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
  31 {
  32         return hppa_dma_ops;
  33 }
  34
  35 static inline void
  36 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
  37                enum dma_data_direction direction)
  38 {
  39         if (hppa_dma_ops->sync_single_for_cpu)
  40                 flush_kernel_dcache_range((unsigned long)vaddr, size);
  41 }
  42
  43 static inline void *
  44 parisc_walk_tree(struct device *dev)
  45 {
  46         struct device *otherdev;
  47         if(likely(dev->platform_data != NULL))
  48                 return dev->platform_data;
  49         /* OK, just traverse the bus to find it */
  50         for(otherdev = dev->parent; otherdev;
  51             otherdev = otherdev->parent) {
  52                 if(otherdev->platform_data) {
  53                         dev->platform_data = otherdev->platform_data;
  54                         break;
  55                 }
  56         }
  57         return dev->platform_data;
  58 }
  59
  60 #define GET_IOC(dev) ({                                 \
  61         void *__pdata = parisc_walk_tree(dev);          \
  62         __pdata ? HBA_DATA(__pdata)->iommu : NULL;      \
  63 })
  64
  65 #ifdef CONFIG_IOMMU_CCIO
  66 struct parisc_device;
  67 struct ioc;
  68 void * ccio_get_iommu(const struct parisc_device *dev);
  69 int ccio_request_resource(const struct parisc_device *dev,
  70                 struct resource *res);
  71 int ccio_allocate_resource(const struct parisc_device *dev,
  72                 struct resource *res, unsigned long size,
  73                 unsigned long min, unsigned long max, unsigned long align);
  74 #else /* !CONFIG_IOMMU_CCIO */
  75 #define ccio_get_iommu(dev) NULL
  76 #define ccio_request_resource(dev, res) insert_resource(&iomem_resource, res)
  77 #define ccio_allocate_resource(dev, res, size, min, max, align) \
  78                 allocate_resource(&iomem_resource, res, size, min, max, \
  79                                 align, NULL, NULL)
  80 #endif /* !CONFIG_IOMMU_CCIO */
  81
  82 #ifdef CONFIG_IOMMU_SBA
  83 struct parisc_device;
  84 void * sba_get_iommu(struct parisc_device *dev);
  85 #endif
  86
  87 #endif