Revert "Ported pcie-brcmstb bounce buffer implementation to ARM64. (#3144)"

This reverts commit 60f3db3.

Author: pelwell

arch/arm64/mm/dma-mapping.c

@@ -31,35 +31,6 @@ void arch_dma_prep_coherent(struct page *page, size_t size)
 }
 
 #ifdef CONFIG_IOMMU_DMA
-static int __swiotlb_get_sgtable_page(struct sg_table *sgt,
-				      struct page *page, size_t size)
-{
-	int ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
-
-	if (!ret)
-		sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
-
-	return ret;
-}
-
-static int __swiotlb_mmap_pfn(struct vm_area_struct *vma,
-			      unsigned long pfn, size_t size)
-{
-	int ret = -ENXIO;
-	unsigned long nr_vma_pages = vma_pages(vma);
-	unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
-	unsigned long off = vma->vm_pgoff;
-
-	if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) {
-		ret = remap_pfn_range(vma, vma->vm_start,
-				      pfn + off,
-				      vma->vm_end - vma->vm_start,
-				      vma->vm_page_prot);
-	}
-
-	return ret;
-}
-
 void arch_teardown_dma_ops(struct device *dev)
 {
 	dev->dma_ops = NULL;

drivers/pci/controller/Makefile

@@ -33,9 +33,6 @@ obj-$(CONFIG_PCIE_BRCMSTB) += pcie-brcmstb.o
 ifdef CONFIG_ARM
 obj-$(CONFIG_PCIE_BRCMSTB) += pcie-brcmstb-bounce.o
 endif
-ifdef CONFIG_ARM64
-obj-$(CONFIG_PCIE_BRCMSTB) += pcie-brcmstb-bounce64.o
-endif
 
 obj-$(CONFIG_VMD) += vmd.o
 # pcie-hisi.o quirks are needed even without CONFIG_PCIE_DW

drivers/pci/controller/pcie-brcmstb-bounce.h

@@ -6,7 +6,7 @@
 #ifndef _PCIE_BRCMSTB_BOUNCE_H
 #define _PCIE_BRCMSTB_BOUNCE_H
 
-#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
+#ifdef CONFIG_ARM
 
 int brcm_pcie_bounce_init(struct device *dev, unsigned long buffer_size,
 			  dma_addr_t threshold);