linux/include/sound/designware_i2s.h
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   1/*
   2 * Copyright (ST) 2012 Rajeev Kumar (rajeev-dlh.kumar@st.com)
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; either version 2 of the License, or
   7 * (at your option) any later version.
   8 *
   9 * This program is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write to the Free Software
  16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17 *
  18 */
  19
  20#ifndef __SOUND_DESIGNWARE_I2S_H
  21#define __SOUND_DESIGNWARE_I2S_H
  22
  23#include <linux/dmaengine.h>
  24#include <linux/types.h>
  25
  26/*
  27 * struct i2s_clk_config_data - represent i2s clk configuration data
  28 * @chan_nr: number of channel
  29 * @data_width: number of bits per sample (8/16/24/32 bit)
  30 * @sample_rate: sampling frequency (8Khz, 16Khz, 32Khz, 44Khz, 48Khz)
  31 */
  32struct i2s_clk_config_data {
  33        int chan_nr;
  34        u32 data_width;
  35        u32 sample_rate;
  36};
  37
  38struct i2s_platform_data {
  39        #define DWC_I2S_PLAY    (1 << 0)
  40        #define DWC_I2S_RECORD  (1 << 1)
  41        unsigned int cap;
  42        int channel;
  43        u32 snd_fmts;
  44        u32 snd_rates;
  45
  46        void *play_dma_data;
  47        void *capture_dma_data;
  48        bool (*filter)(struct dma_chan *chan, void *slave);
  49        int (*i2s_clk_cfg)(struct i2s_clk_config_data *config);
  50};
  51
  52struct i2s_dma_data {
  53        void *data;
  54        dma_addr_t addr;
  55        u32 max_burst;
  56        enum dma_slave_buswidth addr_width;
  57        bool (*filter)(struct dma_chan *chan, void *slave);
  58};
  59
  60/* I2S DMA registers */
  61#define I2S_RXDMA               0x01C0
  62#define I2S_TXDMA               0x01C8
  63
  64#define TWO_CHANNEL_SUPPORT     2       /* up to 2.0 */
  65#define FOUR_CHANNEL_SUPPORT    4       /* up to 3.1 */
  66#define SIX_CHANNEL_SUPPORT     6       /* up to 5.1 */
  67#define EIGHT_CHANNEL_SUPPORT   8       /* up to 7.1 */
  68
  69#endif /*  __SOUND_DESIGNWARE_I2S_H */
  70
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