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/*
* (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__ */
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