designware_i2s.h

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/*
 * Copyright (ST) 2012 Rajeev Kumar ([email protected])
 *
 * 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 */