1 files changed, 61 insertions, 0 deletions
diff --git a/src/soc/nvidia/tegra124/dma.h b/src/soc/nvidia/tegra124/dma.h
new file mode 100644
index 0000000000..d7e9090c0f
--- /dev/null
+++ b/src/soc/nvidia/tegra124/dma.h
@@ -0,0 +1,61 @@
+/*
+ * (C) Copyright 2010,2011
+ * NVIDIA Corporation <www.nvidia.com>
+ *  Copyright (C) 2013 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __NVIDIA_TEGRA124_DMA_H__
+#define __NVIDIA_TEGRA124_DMA_H__
+
+#include <inttypes.h>
+#include <soc/addressmap.h>
+
+/*
+ * The DMA engine operates on 4 bytes at a time, so make sure any data
+ * passed via DMA is aligned to avoid underrun/overrun.
+ */
+#define TEGRA_DMA_ALIGN_BYTES	4
+
+struct apb_dma_channel_regs {
+	u32 csr;		/* 0x00 */
+	u32 sta;		/* 0x04 */
+	u32 dma_byte_sta;	/* 0x08 */
+	u32 csre;		/* 0x0c */
+	u32 ahb_ptr;		/* 0x10 */
+	u32 ahb_seq;		/* 0x14 */
+	u32 apb_ptr;		/* 0x18 */
+	u32 apb_seq;		/* 0x1c */
+	u32 wcount;		/* 0x20 */
+	u32 word_transfer;	/* 0x24 */
+} __attribute__((packed));
+
+struct apb_dma_channel {
+	const int num;
+	struct apb_dma_channel_regs *regs;
+
+	/*
+	 * Basic high-level semaphore that can be used to "claim"
+	 * a DMA channel e.g. by SPI, I2C, or other peripheral driver.
+	 */
+	int in_use;
+};
+
+struct apb_dma_channel * const dma_claim(void);
+void dma_release(struct apb_dma_channel * const channel);
+int dma_start(struct apb_dma_channel * const channel);
+int dma_stop(struct apb_dma_channel * const channel);
+int dma_busy(struct apb_dma_channel * const channel);
+
+#endif	/* __NVIDIA_TEGRA124_DMA_H__ */