sound/soc/s3c24xx/s3c-i2s-v2.h

   1 /* sound/soc/s3c24xx/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 /**
  29  * struct s3c_i2sv2_info - S3C I2S-V2 information
  30  * @dev: The parent device passed to use from the probe.
  31  * @regs: The pointer to the device registe block.
  32  * @master: True if the I2S core is the I2S bit clock master.
  33  * @dma_playback: DMA information for playback channel.
  34  * @dma_capture: DMA information for capture channel.
  35  * @suspend_iismod: PM save for the IISMOD register.
  36  * @suspend_iiscon: PM save for the IISCON register.
  37  * @suspend_iispsr: PM save for the IISPSR register.
  38  *
  39  * This is the private codec state for the hardware associated with an
  40  * I2S channel such as the register mappings and clock sources.
  41  */
  42 struct s3c_i2sv2_info {
  43         struct device   *dev;
  44         void __iomem    *regs;
  45
  46         struct clk      *iis_pclk;
  47         struct clk      *iis_cclk;
  48         struct clk      *iis_clk;
  49
  50         unsigned char    master;
  51
  52         struct s3c24xx_pcm_dma_params   *dma_playback;
  53         struct s3c24xx_pcm_dma_params   *dma_capture;
  54
  55         u32              suspend_iismod;
  56         u32              suspend_iiscon;
  57         u32              suspend_iispsr;
  58 };
  59
  60 struct s3c_i2sv2_rate_calc {
  61         unsigned int    clk_div;        /* for prescaler */
  62         unsigned int    fs_div;         /* for root frame clock */
  63 };
  64
  65 extern int s3c_i2sv2_iis_calc_rate(struct s3c_i2sv2_rate_calc *info,
  66                                    unsigned int *fstab,
  67                                    unsigned int rate, struct clk *clk);
  68
  69 /**
  70  * s3c_i2sv2_probe - probe for i2s device helper
  71  * @pdev: The platform device supplied to the original probe.
  72  * @dai: The ASoC DAI structure supplied to the original probe.
  73  * @i2s: Our local i2s structure to fill in.
  74  * @base: The base address for the registers.
  75  */
  76 extern int s3c_i2sv2_probe(struct platform_device *pdev,
  77                            struct snd_soc_dai *dai,
  78                            struct s3c_i2sv2_info *i2s,
  79                            unsigned long base);
  80
  81 /**
  82  * s3c_i2sv2_register_dai - register dai with soc core
  83  * @dai: The snd_soc_dai structure to register
  84  *
  85  * Fill in any missing fields and then register the given dai with the
  86  * soc core.
  87  */
  88 extern int s3c_i2sv2_register_dai(struct snd_soc_dai *dai);
  89
  90 #endif /* __SND_SOC_S3C24XX_S3C_I2SV2_I2S_H */