--- zzzz-none-000/linux-3.10.107/arch/tile/kernel/pci-dma.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/tile/kernel/pci-dma.c	2021-02-04 17:41:59.000000000 +0000
@@ -36,8 +36,9 @@
 				     dma_addr_t *dma_handle, gfp_t gfp,
 				     struct dma_attrs *attrs)
 {
-	u64 dma_mask = dev->coherent_dma_mask ?: DMA_BIT_MASK(32);
-	int node = dev_to_node(dev);
+	u64 dma_mask = (dev && dev->coherent_dma_mask) ?
+		dev->coherent_dma_mask : DMA_BIT_MASK(32);
+	int node = dev ? dev_to_node(dev) : 0;
 	int order = get_order(size);
 	struct page *pg;
 	dma_addr_t addr;
@@ -256,7 +257,7 @@
 	BUG_ON(!valid_dma_direction(direction));
 
 	__dma_complete_page(pfn_to_page(PFN_DOWN(dma_address)),
-			    dma_address & PAGE_OFFSET, size, direction);
+			    dma_address & (PAGE_SIZE - 1), size, direction);
 }
 
 static void tile_dma_sync_single_for_cpu(struct device *dev,
@@ -357,7 +358,7 @@
 
 	addr = page_to_phys(pg);
 
-	*dma_handle = phys_to_dma(dev, addr);
+	*dma_handle = addr + get_dma_offset(dev);
 
 	return page_address(pg);
 }
@@ -387,7 +388,7 @@
 		sg->dma_address = sg_phys(sg);
 		__dma_prep_pa_range(sg->dma_address, sg->length, direction);
 
-		sg->dma_address = phys_to_dma(dev, sg->dma_address);
+		sg->dma_address = sg->dma_address + get_dma_offset(dev);
 #ifdef CONFIG_NEED_SG_DMA_LENGTH
 		sg->dma_length = sg->length;
 #endif
@@ -422,7 +423,7 @@
 	BUG_ON(offset + size > PAGE_SIZE);
 	__dma_prep_page(page, offset, size, direction);
 
-	return phys_to_dma(dev, page_to_pa(page) + offset);
+	return page_to_pa(page) + offset + get_dma_offset(dev);
 }
 
 static void tile_pci_dma_unmap_page(struct device *dev, dma_addr_t dma_address,
@@ -432,10 +433,10 @@
 {
 	BUG_ON(!valid_dma_direction(direction));
 
-	dma_address = dma_to_phys(dev, dma_address);
+	dma_address -= get_dma_offset(dev);
 
 	__dma_complete_page(pfn_to_page(PFN_DOWN(dma_address)),
-			    dma_address & PAGE_OFFSET, size, direction);
+			    dma_address & (PAGE_SIZE - 1), size, direction);
 }
 
 static void tile_pci_dma_sync_single_for_cpu(struct device *dev,
@@ -445,7 +446,7 @@
 {
 	BUG_ON(!valid_dma_direction(direction));
 
-	dma_handle = dma_to_phys(dev, dma_handle);
+	dma_handle -= get_dma_offset(dev);
 
 	__dma_complete_pa_range(dma_handle, size, direction);
 }
@@ -456,7 +457,7 @@
 						enum dma_data_direction
 						direction)
 {
-	dma_handle = dma_to_phys(dev, dma_handle);
+	dma_handle -= get_dma_offset(dev);
 
 	__dma_prep_pa_range(dma_handle, size, direction);
 }
@@ -558,22 +559,47 @@
 	.mapping_error = swiotlb_dma_mapping_error,
 };
 
+static struct dma_map_ops pci_hybrid_dma_ops = {
+	.alloc = tile_swiotlb_alloc_coherent,
+	.free = tile_swiotlb_free_coherent,
+	.map_page = tile_pci_dma_map_page,
+	.unmap_page = tile_pci_dma_unmap_page,
+	.map_sg = tile_pci_dma_map_sg,
+	.unmap_sg = tile_pci_dma_unmap_sg,
+	.sync_single_for_cpu = tile_pci_dma_sync_single_for_cpu,
+	.sync_single_for_device = tile_pci_dma_sync_single_for_device,
+	.sync_sg_for_cpu = tile_pci_dma_sync_sg_for_cpu,
+	.sync_sg_for_device = tile_pci_dma_sync_sg_for_device,
+	.mapping_error = tile_pci_dma_mapping_error,
+	.dma_supported = tile_pci_dma_supported
+};
+
 struct dma_map_ops *gx_legacy_pci_dma_map_ops = &pci_swiotlb_dma_ops;
+struct dma_map_ops *gx_hybrid_pci_dma_map_ops = &pci_hybrid_dma_ops;
 #else
 struct dma_map_ops *gx_legacy_pci_dma_map_ops;
+struct dma_map_ops *gx_hybrid_pci_dma_map_ops;
 #endif
 EXPORT_SYMBOL(gx_legacy_pci_dma_map_ops);
+EXPORT_SYMBOL(gx_hybrid_pci_dma_map_ops);
 
 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
 int dma_set_coherent_mask(struct device *dev, u64 mask)
 {
 	struct dma_map_ops *dma_ops = get_dma_ops(dev);
 
-	/* Handle legacy PCI devices with limited memory addressability. */
-	if (((dma_ops == gx_pci_dma_map_ops) ||
-	    (dma_ops == gx_legacy_pci_dma_map_ops)) &&
-	    (mask <= DMA_BIT_MASK(32))) {
-		if (mask > dev->archdata.max_direct_dma_addr)
+	/*
+	 * For PCI devices with 64-bit DMA addressing capability, promote
+	 * the dma_ops to full capability for both streams and consistent
+	 * memory access. For 32-bit capable devices, limit the consistent 
+	 * memory DMA range to max_direct_dma_addr.
+	 */
+	if (dma_ops == gx_pci_dma_map_ops ||
+	    dma_ops == gx_hybrid_pci_dma_map_ops ||
+	    dma_ops == gx_legacy_pci_dma_map_ops) {
+		if (mask == DMA_BIT_MASK(64))
+			set_dma_ops(dev, gx_pci_dma_map_ops);
+		else if (mask > dev->archdata.max_direct_dma_addr)
 			mask = dev->archdata.max_direct_dma_addr;
 	}
 
@@ -584,3 +610,21 @@
 }
 EXPORT_SYMBOL(dma_set_coherent_mask);
 #endif
+
+#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
+/*
+ * The generic dma_get_required_mask() uses the highest physical address
+ * (max_pfn) to provide the hint to the PCI drivers regarding 32-bit or
+ * 64-bit DMA configuration. Since TILEGx has I/O TLB/MMU, allowing the
+ * DMAs to use the full 64-bit PCI address space and not limited by
+ * the physical memory space, we always let the PCI devices use
+ * 64-bit DMA if they have that capability, by returning the 64-bit
+ * DMA mask here. The device driver has the option to use 32-bit DMA if
+ * the device is not capable of 64-bit DMA.
+ */
+u64 dma_get_required_mask(struct device *dev)
+{
+	return DMA_BIT_MASK(64);
+}
+EXPORT_SYMBOL_GPL(dma_get_required_mask);
+#endif