Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / include / bouncebuf.h

diff --git a/qemu/roms/u-boot/include/bouncebuf.h b/qemu/roms/u-boot/include/bouncebuf.h
new file mode 100644 (file)
index 0000000..5ffa99b
--- /dev/null
+++ b/qemu/roms/u-boot/include/bouncebuf.h
@@ -0,0 +1,72 @@
+/*
+ * Generic bounce buffer implementation
+ *
+ * Copyright (C) 2012 Marek Vasut <marex@denx.de>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#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