1. 根目录:
2. include
3. sound
4. designware_i2s.h

/*
 * Copyright (ST) 2012 Rajeev Kumar (rajeev-dlh.kumar@st.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

#ifndef __SOUND_DESIGNWARE_I2S_H
#define __SOUND_DESIGNWARE_I2S_H

#include <linux/dmaengine.h>
#include <linux/types.h>

/*
 * struct i2s_clk_config_data - represent i2s clk configuration data
 * @chan_nr: number of channel
 * @data_width: number of bits per sample (8/16/24/32 bit)
 * @sample_rate: sampling frequency (8Khz, 16Khz, 32Khz, 44Khz, 48Khz)
 */
struct i2s_clk_config_data {
	int chan_nr;
	u32 data_width;
	u32 sample_rate;
};

struct i2s_platform_data {
	#define DWC_I2S_PLAY	(1 << 0)
	#define DWC_I2S_RECORD	(1 << 1)
	unsigned int cap;
	int channel;
	u32 snd_fmts;
	u32 snd_rates;

	void *play_dma_data;
	void *capture_dma_data;
	bool (*filter)(struct dma_chan *chan, void *slave);
	int (*i2s_clk_cfg)(struct i2s_clk_config_data *config);
};

struct i2s_dma_data {
	void *data;
	dma_addr_t addr;
	u32 max_burst;
	enum dma_slave_buswidth addr_width;
	bool (*filter)(struct dma_chan *chan, void *slave);
};

/* I2S DMA registers */
#define I2S_RXDMA		0x01C0
#define I2S_TXDMA		0x01C8

#define TWO_CHANNEL_SUPPORT	2	/* up to 2.0 */
#define FOUR_CHANNEL_SUPPORT	4	/* up to 3.1 */
#define SIX_CHANNEL_SUPPORT	6	/* up to 5.1 */
#define EIGHT_CHANNEL_SUPPORT	8	/* up to 7.1 */

#endif /*  __SOUND_DESIGNWARE_I2S_H */