media: staging/intel-ipu3: mmu: Implement driver

This driver translates IO virtual address to physical
address based on two levels page tables.
Signed-off-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Yong Zhi <yong.zhi@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/staging/media/ipu3/ipu3-mmu.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2018 Intel Corporation */
+/* Copyright 2018 Google LLC. */
+
+#ifndef __IPU3_MMU_H
+#define __IPU3_MMU_H
+
+/**
+ * struct ipu3_mmu_info - Describes mmu geometry
+ *
+ * @aperture_start:	First address that can be mapped
+ * @aperture_end:	Last address that can be mapped
+ * @pgsize_bitmap:	Bitmap of page sizes in use
+ */
+struct ipu3_mmu_info {
+	dma_addr_t aperture_start;
+	dma_addr_t aperture_end;
+	unsigned long pgsize_bitmap;
+};
+
+struct device;
+struct scatterlist;
+
+struct ipu3_mmu_info *ipu3_mmu_init(struct device *parent, void __iomem *base);
+void ipu3_mmu_exit(struct ipu3_mmu_info *info);
+void ipu3_mmu_suspend(struct ipu3_mmu_info *info);
+void ipu3_mmu_resume(struct ipu3_mmu_info *info);
+
+int ipu3_mmu_map(struct ipu3_mmu_info *info, unsigned long iova,
+		 phys_addr_t paddr, size_t size);
+size_t ipu3_mmu_unmap(struct ipu3_mmu_info *info, unsigned long iova,
+		      size_t size);
+size_t ipu3_mmu_map_sg(struct ipu3_mmu_info *info, unsigned long iova,
+		       struct scatterlist *sg, unsigned int nents);
+#endif