1 files changed, 254 insertions, 0 deletions

diff --git a/include/asm-parisc/dma-mapping.h b/include/asm-parisc/dma-mapping.h
new file mode 100644
index 000000000000..4db84f969e9e
--- /dev/null
+++ b/include/asm-parisc/dma-mapping.h
@@ -0,0 +1,254 @@
+#ifndef _PARISC_DMA_MAPPING_H
+#define _PARISC_DMA_MAPPING_H
+
+#include <linux/config.h>
+#include <linux/mm.h>
+#include <asm/cacheflush.h>
+#include <asm/scatterlist.h>
+
+/* See Documentation/DMA-mapping.txt */
+struct hppa_dma_ops {
+        int  (*dma_supported)(struct device *dev, u64 mask);
+        void *(*alloc_consistent)(struct device *dev, size_t size, dma_addr_t *iova, int flag);
+        void *(*alloc_noncoherent)(struct device *dev, size_t size, dma_addr_t *iova, int flag);
+        void (*free_consistent)(struct device *dev, size_t size, void *vaddr, dma_addr_t iova);
+        dma_addr_t (*map_single)(struct device *dev, void *addr, size_t size, enum dma_data_direction direction);
+        void (*unmap_single)(struct device *dev, dma_addr_t iova, size_t size, enum dma_data_direction direction);
+        int  (*map_sg)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction);
+        void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nhwents, enum dma_data_direction direction);
+        void (*dma_sync_single_for_cpu)(struct device *dev, dma_addr_t iova, unsigned long offset, size_t size, enum dma_data_direction direction);
+        void (*dma_sync_single_for_device)(struct device *dev, dma_addr_t iova, unsigned long offset, size_t size, enum dma_data_direction direction);
+        void (*dma_sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction direction);
+        void (*dma_sync_sg_for_device)(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction direction);
+};
+
+/*
+** We could live without the hppa_dma_ops indirection if we didn't want
+** to support 4 different coherent dma models with one binary (they will
+** someday be loadable modules):
+**     I/O MMU        consistent method           dma_sync behavior
+**  =============   ======================       =======================
+**  a) PA-7x00LC    uncachable host memory          flush/purge
+**  b) U2/Uturn      cachable host memory              NOP
+**  c) Ike/Astro     cachable host memory              NOP
+**  d) EPIC/SAGA     memory on EPIC/SAGA         flush/reset DMA channel
+**
+** PA-7[13]00LC processors have a GSC bus interface and no I/O MMU.
+**
+** Systems (eg PCX-T workstations) that don't fall into the above
+** categories will need to modify the needed drivers to perform
+** flush/purge and allocate "regular" cacheable pages for everything.
+*/
+
+#ifdef CONFIG_PA11
+extern struct hppa_dma_ops pcxl_dma_ops;
+extern struct hppa_dma_ops pcx_dma_ops;
+#endif
+
+extern struct hppa_dma_ops *hppa_dma_ops;
+
+static inline void *
+dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
+                   int flag)
+{
+        return hppa_dma_ops->alloc_consistent(dev, size, dma_handle, flag);
+}
+
+static inline void *
+dma_alloc_noncoherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
+                      int flag)
+{
+        return hppa_dma_ops->alloc_noncoherent(dev, size, dma_handle, flag);
+}
+
+static inline void
+dma_free_coherent(struct device *dev, size_t size, 
+                    void *vaddr, dma_addr_t dma_handle)
+{
+        hppa_dma_ops->free_consistent(dev, size, vaddr, dma_handle);
+}
+
+static inline void
+dma_free_noncoherent(struct device *dev, size_t size, 
+                    void *vaddr, dma_addr_t dma_handle)
+{
+        hppa_dma_ops->free_consistent(dev, size, vaddr, dma_handle);
+}
+
+static inline dma_addr_t
+dma_map_single(struct device *dev, void *ptr, size_t size,
+               enum dma_data_direction direction)
+{
+        return hppa_dma_ops->map_single(dev, ptr, size, direction);
+}
+
+static inline void
+dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
+                 enum dma_data_direction direction)
+{
+        hppa_dma_ops->unmap_single(dev, dma_addr, size, direction);
+}
+
+static inline int
+dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+           enum dma_data_direction direction)
+{
+        return hppa_dma_ops->map_sg(dev, sg, nents, direction);
+}
+
+static inline void
+dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
+             enum dma_data_direction direction)
+{
+        hppa_dma_ops->unmap_sg(dev, sg, nhwentries, direction);
+}
+
+static inline dma_addr_t
+dma_map_page(struct device *dev, struct page *page, unsigned long offset,
+             size_t size, enum dma_data_direction direction)
+{
+        return dma_map_single(dev, (page_address(page) + (offset)), size, direction);
+}
+
+static inline void
+dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
+               enum dma_data_direction direction)
+{
+        dma_unmap_single(dev, dma_address, size, direction);
+}
+
+
+static inline void
+dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
+                enum dma_data_direction direction)
+{
+        if(hppa_dma_ops->dma_sync_single_for_cpu)
+                hppa_dma_ops->dma_sync_single_for_cpu(dev, dma_handle, 0, size, direction);
+}
+
+static inline void
+dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
+                enum dma_data_direction direction)
+{
+        if(hppa_dma_ops->dma_sync_single_for_device)
+                hppa_dma_ops->dma_sync_single_for_device(dev, dma_handle, 0, size, direction);
+}
+
+static inline void
+dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
+                      unsigned long offset, size_t size,
+                      enum dma_data_direction direction)
+{
+        if(hppa_dma_ops->dma_sync_single_for_cpu)
+                hppa_dma_ops->dma_sync_single_for_cpu(dev, dma_handle, offset, size, direction);
+}
+
+static inline void
+dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
+                      unsigned long offset, size_t size,
+                      enum dma_data_direction direction)
+{
+        if(hppa_dma_ops->dma_sync_single_for_device)
+                hppa_dma_ops->dma_sync_single_for_device(dev, dma_handle, offset, size, direction);
+}
+
+static inline void
+dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
+                 enum dma_data_direction direction)
+{
+        if(hppa_dma_ops->dma_sync_sg_for_cpu)
+                hppa_dma_ops->dma_sync_sg_for_cpu(dev, sg, nelems, direction);
+}
+
+static inline void
+dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
+                 enum dma_data_direction direction)
+{
+        if(hppa_dma_ops->dma_sync_sg_for_device)
+                hppa_dma_ops->dma_sync_sg_for_device(dev, sg, nelems, direction);
+}
+
+static inline int
+dma_supported(struct device *dev, u64 mask)
+{
+        return hppa_dma_ops->dma_supported(dev, mask);
+}
+
+static inline int
+dma_set_mask(struct device *dev, u64 mask)
+{
+        if(!dev->dma_mask || !dma_supported(dev, mask))
+                return -EIO;
+
+        *dev->dma_mask = mask;
+
+        return 0;
+}
+
+static inline int
+dma_get_cache_alignment(void)
+{
+        return dcache_stride;
+}
+
+static inline int
+dma_is_consistent(dma_addr_t dma_addr)
+{
+        return (hppa_dma_ops->dma_sync_single_for_cpu == NULL);
+}
+
+static inline void
+dma_cache_sync(void *vaddr, size_t size,
+               enum dma_data_direction direction)
+{
+        if(hppa_dma_ops->dma_sync_single_for_cpu)
+                flush_kernel_dcache_range((unsigned long)vaddr, size);
+}
+
+static inline void *
+parisc_walk_tree(struct device *dev)
+{
+        struct device *otherdev;
+        if(likely(dev->platform_data != NULL))
+                return dev->platform_data;
+        /* OK, just traverse the bus to find it */
+        for(otherdev = dev->parent; otherdev;
+            otherdev = otherdev->parent) {
+                if(otherdev->platform_data) {
+                        dev->platform_data = otherdev->platform_data;
+                        break;
+                }
+        }
+        BUG_ON(!dev->platform_data);
+        return dev->platform_data;
+}
+                
+#define GET_IOC(dev) (HBA_DATA(parisc_walk_tree(dev))->iommu);  
+        
+
+#ifdef CONFIG_IOMMU_CCIO
+struct parisc_device;
+struct ioc;
+void * ccio_get_iommu(const struct parisc_device *dev);
+int ccio_request_resource(const struct parisc_device *dev,
+                struct resource *res);
+int ccio_allocate_resource(const struct parisc_device *dev,
+                struct resource *res, unsigned long size,
+                unsigned long min, unsigned long max, unsigned long align);
+#else /* !CONFIG_IOMMU_CCIO */
+#define ccio_get_iommu(dev) NULL
+#define ccio_request_resource(dev, res) request_resource(&iomem_resource, res)
+#define ccio_allocate_resource(dev, res, size, min, max, align) \
+                allocate_resource(&iomem_resource, res, size, min, max, \
+                                align, NULL, NULL)
+#endif /* !CONFIG_IOMMU_CCIO */
+
+#ifdef CONFIG_IOMMU_SBA
+struct parisc_device;
+void * sba_get_iommu(struct parisc_device *dev);
+#endif
+
+/* At the moment, we panic on error for IOMMU resource exaustion */
+#define dma_mapping_error(x)    0
+
+#endif