1 files changed, 55 insertions, 0 deletions
diff --git a/drivers/staging/media/ipu3/ipu3-css-pool.h b/drivers/staging/media/ipu3/ipu3-css-pool.h
new file mode 100644
index 000000000000..2657c39a4d71
--- /dev/null
+++ b/drivers/staging/media/ipu3/ipu3-css-pool.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2018 Intel Corporation */
+
+#ifndef __IPU3_UTIL_H
+#define __IPU3_UTIL_H
+
+struct device;
+struct imgu_device;
+
+#define IPU3_CSS_POOL_SIZE		4
+
+/**
+ * ipu3_css_map - store DMA mapping info for buffer
+ *
+ * @size:		size of the buffer in bytes.
+ * @vaddr:		kernel virtual address.
+ * @daddr:		iova dma address to access IPU3.
+ * @vma:		private, a pointer to &struct vm_struct,
+ *			used for ipu3_dmamap_free.
+ */
+struct ipu3_css_map {
+	size_t size;
+	void *vaddr;
+	dma_addr_t daddr;
+	struct vm_struct *vma;
+};
+
+/**
+ * ipu3_css_pool - circular buffer pool definition
+ *
+ * @entry:		array with IPU3_CSS_POOL_SIZE elements.
+ * @entry.param:	a &struct ipu3_css_map for storing the mem mapping.
+ * @entry.valid:	used to mark if the entry has valid data.
+ * @last:		write pointer, initialized to IPU3_CSS_POOL_SIZE.
+ */
+struct ipu3_css_pool {
+	struct {
+		struct ipu3_css_map param;
+		bool valid;
+	} entry[IPU3_CSS_POOL_SIZE];
+	u32 last;
+};
+
+int ipu3_css_dma_buffer_resize(struct imgu_device *imgu,
+			       struct ipu3_css_map *map, size_t size);
+void ipu3_css_pool_cleanup(struct imgu_device *imgu,
+			   struct ipu3_css_pool *pool);
+int ipu3_css_pool_init(struct imgu_device *imgu, struct ipu3_css_pool *pool,
+		       size_t size);
+void ipu3_css_pool_get(struct ipu3_css_pool *pool);
+void ipu3_css_pool_put(struct ipu3_css_pool *pool);
+const struct ipu3_css_map *ipu3_css_pool_last(struct ipu3_css_pool *pool,
+					      u32 last);
+
+#endif