[PATCH] fpga: dfl: afu: use PFN_DOWN() and PFN_PHYS() helper macros

[Peter Colberg]

Replace all shifts by PAGE_SHIFT with PFN_DOWN() and PFN_PHYS() helper
macros to convert between physical addresses and page frame numbers.

Suggested-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Colberg <peter.colberg@xxxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
 drivers/fpga/dfl-afu-dma-region.c | 7 ++++---
 drivers/fpga/dfl-afu-main.c       | 5 +++--
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/fpga/dfl-afu-dma-region.c b/drivers/fpga/dfl-afu-dma-region.c
index 02b60fde0430..e8d54cfbb301 100644
--- a/drivers/fpga/dfl-afu-dma-region.c
+++ b/drivers/fpga/dfl-afu-dma-region.c
@@ -10,6 +10,7 @@
  */
 
 #include <linux/dma-mapping.h>
+#include <linux/pfn.h>
 #include <linux/sched/signal.h>
 #include <linux/uaccess.h>
 #include <linux/mm.h>
@@ -34,7 +35,7 @@ void afu_dma_region_init(struct dfl_feature_platform_data *pdata)
 static int afu_dma_pin_pages(struct dfl_feature_platform_data *pdata,
 			     struct dfl_afu_dma_region *region)
 {
-	int npages = region->length >> PAGE_SHIFT;
+	int npages = PFN_DOWN(region->length);
 	struct device *dev = &pdata->dev->dev;
 	int ret, pinned;
 
@@ -82,7 +83,7 @@ static int afu_dma_pin_pages(struct dfl_feature_platform_data *pdata,
 static void afu_dma_unpin_pages(struct dfl_feature_platform_data *pdata,
 				struct dfl_afu_dma_region *region)
 {
-	long npages = region->length >> PAGE_SHIFT;
+	long npages = PFN_DOWN(region->length);
 	struct device *dev = &pdata->dev->dev;
 
 	unpin_user_pages(region->pages, npages);
@@ -101,7 +102,7 @@ static void afu_dma_unpin_pages(struct dfl_feature_platform_data *pdata,
  */
 static bool afu_dma_check_continuous_pages(struct dfl_afu_dma_region *region)
 {
-	int npages = region->length >> PAGE_SHIFT;
+	int npages = PFN_DOWN(region->length);
 	int i;
 
 	for (i = 0; i < npages - 1; i++)
diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
index 7f621e96d3b8..048c9b418c8b 100644
--- a/drivers/fpga/dfl-afu-main.c
+++ b/drivers/fpga/dfl-afu-main.c
@@ -16,6 +16,7 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/pfn.h>
 #include <linux/uaccess.h>
 #include <linux/fpga-dfl.h>
 
@@ -816,7 +817,7 @@ static int afu_mmap(struct file *filp, struct vm_area_struct *vma)
 
 	pdata = dev_get_platdata(&pdev->dev);
 
-	offset = vma->vm_pgoff << PAGE_SHIFT;
+	offset = PFN_PHYS(vma->vm_pgoff);
 	ret = afu_mmio_region_get_by_offset(pdata, offset, size, &region);
 	if (ret)
 		return ret;
@@ -837,7 +838,7 @@ static int afu_mmap(struct file *filp, struct vm_area_struct *vma)
 	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 
 	return remap_pfn_range(vma, vma->vm_start,
-			(region.phys + (offset - region.offset)) >> PAGE_SHIFT,
+			PFN_DOWN(region.phys + (offset - region.offset)),
 			size, vma->vm_page_prot);
 }
 
-- 
2.28.0