1 files changed, 71 insertions, 0 deletions
diff --git a/include/bouncebuf.h b/include/bouncebuf.h
new file mode 100644
index 0000000..fd9b0f3
--- /dev/null
+++ b/include/bouncebuf.h
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Generic bounce buffer implementation
+ *
+ * Copyright (C) 2012 Marek Vasut <marex@denx.de>
+ */
+
+#ifndef __INCLUDE_BOUNCEBUF_H__
+#define __INCLUDE_BOUNCEBUF_H__
+
+#include <linux/types.h>
+
+/*
+ * GEN_BB_READ -- Data are read from the buffer eg. by DMA hardware.
+ * The source buffer is copied into the bounce buffer (if unaligned, otherwise
+ * the source buffer is used directly) upon start() call, then the operation
+ * requiring the aligned transfer happens, then the bounce buffer is lost upon
+ * stop() call.
+ */
+#define GEN_BB_READ	(1 << 0)
+/*
+ * GEN_BB_WRITE -- Data are written into the buffer eg. by DMA hardware.
+ * The source buffer starts in an undefined state upon start() call, then the
+ * operation requiring the aligned transfer happens, then the bounce buffer is
+ * copied into the destination buffer (if unaligned, otherwise destination
+ * buffer is used directly) upon stop() call.
+ */
+#define GEN_BB_WRITE	(1 << 1)
+/*
+ * GEN_BB_RW -- Data are read and written into the buffer eg. by DMA hardware.
+ * The source buffer is copied into the bounce buffer (if unaligned, otherwise
+ * the source buffer is used directly) upon start() call, then the  operation
+ * requiring the aligned transfer happens, then the bounce buffer is  copied
+ * into the destination buffer (if unaligned, otherwise destination buffer is
+ * used directly) upon stop() call.
+ */
+#define GEN_BB_RW	(GEN_BB_READ | GEN_BB_WRITE)
+
+struct bounce_buffer {
+	/* Copy of data parameter passed to start() */
+	void *user_buffer;
+	/*
+	 * DMA-aligned buffer. This field is always set to the value that
+	 * should be used for DMA; either equal to .user_buffer, or to a
+	 * freshly allocated aligned buffer.
+	 */
+	void *bounce_buffer;
+	/* Copy of len parameter passed to start() */
+	size_t len;
+	/* DMA-aligned buffer length */
+	size_t len_aligned;
+	/* Copy of flags parameter passed to start() */
+	unsigned int flags;
+};
+
+/**
+ * bounce_buffer_start() -- Start the bounce buffer session
+ * state:	stores state passed between bounce_buffer_{start,stop}
+ * data:	pointer to buffer to be aligned
+ * len:		length of the buffer
+ * flags:	flags describing the transaction, see above.
+ */
+int bounce_buffer_start(struct bounce_buffer *state, void *data,
+			size_t len, unsigned int flags);
+/**
+ * bounce_buffer_stop() -- Finish the bounce buffer session
+ * state:	stores state passed between bounce_buffer_{start,stop}
+ */
+int bounce_buffer_stop(struct bounce_buffer *state);
+
+#endif