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Linux/sound/soc/samsung/s3c-i2s-v2.h

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  1 /* sound/soc/samsung/s3c-i2s-v2.h
  2  *
  3  * ALSA Soc Audio Layer - S3C_I2SV2 I2S driver
  4  *
  5  * Copyright (c) 2007 Simtec Electronics
  6  *      http://armlinux.simtec.co.uk/
  7  *      Ben Dooks <ben@simtec.co.uk>
  8  *
  9  *  This program is free software; you can redistribute  it and/or modify it
 10  *  under  the terms of  the GNU General  Public License as published by the
 11  *  Free Software Foundation;  either version 2 of the  License, or (at your
 12  *  option) any later version.
 13 */
 14 
 15 /* This code is the core support for the I2S block found in a number of
 16  * Samsung SoC devices which is unofficially named I2S-V2. Currently the
 17  * S3C2412 and the S3C64XX series use this block to provide 1 or 2 I2S
 18  * channels via configurable GPIO.
 19  */
 20 
 21 #ifndef __SND_SOC_S3C24XX_S3C_I2SV2_I2S_H
 22 #define __SND_SOC_S3C24XX_S3C_I2SV2_I2S_H __FILE__
 23 
 24 #define S3C_I2SV2_DIV_BCLK      (1)
 25 #define S3C_I2SV2_DIV_RCLK      (2)
 26 #define S3C_I2SV2_DIV_PRESCALER (3)
 27 
 28 #define S3C_I2SV2_CLKSRC_PCLK           0
 29 #define S3C_I2SV2_CLKSRC_AUDIOBUS       1
 30 #define S3C_I2SV2_CLKSRC_CDCLK          2
 31 
 32 /* Set this flag for I2S controllers that have the bit IISMOD[12]
 33  * bridge/break RCLK signal and external Xi2sCDCLK pin.
 34  */
 35 #define S3C_FEATURE_CDCLKCON    (1 << 0)
 36 
 37 /**
 38  * struct s3c_i2sv2_info - S3C I2S-V2 information
 39  * @dev: The parent device passed to use from the probe.
 40  * @regs: The pointer to the device registe block.
 41  * @feature: Set of bit-flags indicating features of the controller.
 42  * @master: True if the I2S core is the I2S bit clock master.
 43  * @dma_playback: DMA information for playback channel.
 44  * @dma_capture: DMA information for capture channel.
 45  * @suspend_iismod: PM save for the IISMOD register.
 46  * @suspend_iiscon: PM save for the IISCON register.
 47  * @suspend_iispsr: PM save for the IISPSR register.
 48  *
 49  * This is the private codec state for the hardware associated with an
 50  * I2S channel such as the register mappings and clock sources.
 51  */
 52 struct s3c_i2sv2_info {
 53         struct device   *dev;
 54         void __iomem    *regs;
 55 
 56         u32             feature;
 57 
 58         struct clk      *iis_pclk;
 59         struct clk      *iis_cclk;
 60 
 61         unsigned char    master;
 62 
 63         struct s3c_dma_params   *dma_playback;
 64         struct s3c_dma_params   *dma_capture;
 65 
 66         u32              suspend_iismod;
 67         u32              suspend_iiscon;
 68         u32              suspend_iispsr;
 69 
 70         unsigned long   base;
 71 };
 72 
 73 extern struct clk *s3c_i2sv2_get_clock(struct snd_soc_dai *cpu_dai);
 74 
 75 struct s3c_i2sv2_rate_calc {
 76         unsigned int    clk_div;        /* for prescaler */
 77         unsigned int    fs_div;         /* for root frame clock */
 78 };
 79 
 80 extern int s3c_i2sv2_iis_calc_rate(struct s3c_i2sv2_rate_calc *info,
 81                                    unsigned int *fstab,
 82                                    unsigned int rate, struct clk *clk);
 83 
 84 /**
 85  * s3c_i2sv2_probe - probe for i2s device helper
 86  * @dai: The ASoC DAI structure supplied to the original probe.
 87  * @i2s: Our local i2s structure to fill in.
 88  * @base: The base address for the registers.
 89  */
 90 extern int s3c_i2sv2_probe(struct snd_soc_dai *dai,
 91                            struct s3c_i2sv2_info *i2s,
 92                            unsigned long base);
 93 
 94 /**
 95  * s3c_i2sv2_register_component - register component and dai with soc core
 96  * @dev: DAI device
 97  * @id: DAI ID
 98  * @drv: The driver structure to register
 99  *
100  * Fill in any missing fields and then register the given dai with the
101  * soc core.
102  */
103 extern int s3c_i2sv2_register_component(struct device *dev, int id,
104                                         const struct snd_soc_component_driver *cmp_drv,
105                                         struct snd_soc_dai_driver *dai_drv);
106 
107 #endif /* __SND_SOC_S3C24XX_S3C_I2SV2_I2S_H */
108 

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