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 */
91
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