1 files changed, 75 insertions, 0 deletions
diff --git a/arch/parisc/include/asm/dma-mapping.h b/arch/parisc/include/asm/dma-mapping.h
new file mode 100644
index 000000000..44a9f9719
--- /dev/null
+++ b/arch/parisc/include/asm/dma-mapping.h
@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _PARISC_DMA_MAPPING_H
+#define _PARISC_DMA_MAPPING_H
+
+#include <asm/cacheflush.h>
+
+/*
+** We need to support 4 different coherent dma models with one binary:
+**
+**     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.
+*/
+
+extern const struct dma_map_ops *hppa_dma_ops;
+
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
+{
+	return hppa_dma_ops;
+}
+
+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;
+		}
+	}
+	return dev->platform_data;
+}
+
+#define GET_IOC(dev) ({					\
+	void *__pdata = parisc_walk_tree(dev);		\
+	__pdata ? HBA_DATA(__pdata)->iommu : NULL;	\
+})
+
+#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) insert_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
+
+#endif